CN-122000937-A - Constant volume alternating current energy consumption configuration method, device and equipment

CN122000937ACN 122000937 ACN122000937 ACN 122000937ACN-122000937-A

Abstract

The invention discloses an isovolumetric alternating current energy consumption configuration method, a switching device and equipment, wherein the configuration method comprises the steps of obtaining the total alternating current energy consumption capacity to be configured; the method comprises the steps of determining the total number of groups of alternating current energy consumption branches and the capacity of each group of alternating current energy consumption branches according to rated alternating current voltage levels and equipment parameters, additionally configuring a group of redundant alternating current energy consumption branches with equal capacity, replacing the redundant alternating current energy consumption branches with the redundant groups when the non-redundant groups of alternating current energy consumption branches are damaged, guaranteeing reliable suppression of surplus power, simulating the running state of an electric power system, and determining the resistance of each group of alternating current energy consumption branches by taking the fact that the alternating current energy consumption can absorb all surplus power as a standard when the alternating current voltage is reduced to the maximum. The invention is used for realizing the suppression of alternating current and direct current overvoltage after fault ride-through or locking of the modularized multi-level converter, and meets the operation requirement of a new energy source sending system through a flexible direct island.

Inventors

Xu Maoning
WANG SHUAI
FAN QIANG
ZOU KAIKAI
LU YU
JIANG CHONGXUE
LU JIANG
Chang Shiyang
Zhong qidi
LU YAJUN
WANG SHAOWEI

Assignees

南京南瑞继保电气有限公司
国网新疆电力有限公司经济技术研究院
国网经济技术研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20251225

Claims (20)

1. A method for configuring constant volume alternating current energy consumption is characterized by comprising the steps of, The method comprises the steps of obtaining the total alternating current energy consumption capacity to be configured, wherein the total alternating current energy consumption capacity can reliably inhibit surplus power of a flexible-direct system when the total alternating current energy consumption capacity meets the requirement of total input; Distributing the total AC energy consumption capacity according to rated AC voltage class and equipment parameters, and determining the total number of groups of AC energy consumption branches and the capacity of each group of AC energy consumption branches; configuring a group of redundant alternating current energy consumption branches, wherein the redundant alternating current energy consumption branches have the same capacity as the alternating current energy consumption branches; And simulating the running state of the power system, and determining the resistance of each group of alternating current energy consumption branches by taking the standard that the alternating current energy consumption can absorb all surplus power when the alternating current voltage is reduced to the maximum.
2. The method of claim 1, wherein the AC power consumption is configured at a new power station at a transmitting end, each AC power consumption branch is formed by serially connecting resistors of an angle connection and anti-parallel thyristors, and parameters of the resistors and the anti-parallel thyristors hung on three angle connection circuits are identical.
3. The method for configuring as recited in claim 1, wherein obtaining the total capacity of the AC power consumption to be configured comprises, Obtaining allowable surplus power P gx of an alternating current power grid; And obtaining the total alternating current energy consumption capacity PMAX=P mz -P gx to be configured according to the allowable surplus power P gx of the alternating current power grid, wherein P mz is the flexible direct current rated transmission capacity.
4. The method for configuring as recited in claim 1, wherein the total AC power consumption capacity is allocated based on the rated AC voltage level and the equipment parameters, and the total number of AC power consumption branches and the capacity of each AC power consumption branch are determined, including, And comprehensively considering the rated alternating-current voltage grade of the secondary side of the energy-consuming transformer, the current-resistant capability of a thyristor for switching the alternating-current energy-consuming branch, the short-time overload capacity of the energy-consuming transformer and the rated capacity of the flexible direct-current system, determining the capacity P h of each group of alternating-current energy-consuming branch and the number N h of groups of the hanging alternating-current energy-consuming branches of each energy-consuming transformer, wherein the total number of groups of the alternating-current energy-consuming branch is N h x k, k is the number of the energy-consuming transformers, and the product of the capacity of each group of alternating-current energy-consuming branches and the total number of groups of the alternating-current energy-consuming branches is equal to the total capacity of the alternating-current energy consumption.
5. The method of claim 1, wherein simulating the power system operating state, determining the resistance of each set of AC power dissipating branches based on the AC power dissipation capacity to absorb all surplus power when the AC voltage is reduced to a maximum, comprises, Constructing a simulation model of the power system; the simulation model operates under a full-power working condition, and all alternating current energy consumption branches are put into the simulation model to obtain power consumed by a single group of alternating current energy consumption branches; And adjusting the resistance value of the alternating current energy consumption branch circuit to ensure that the capacity of a single group of alternating current energy consumption branch circuits reaches the capacity of each group of alternating current energy consumption branch circuits determined in the prior art, wherein the resistance value at the moment is the resistance of the alternating current energy consumption branch circuits required to be determined.
6. An equal volume alternating current energy consumption configuration device is characterized by comprising, The system comprises an alternating current energy consumption total capacity acquisition module, an alternating current energy consumption total capacity acquisition module and a control module, wherein the alternating current energy consumption total capacity acquisition module is configured to acquire alternating current energy consumption total capacity to be configured; The alternating current energy consumption branch total group number and capacity distribution module is configured to distribute the alternating current energy consumption total capacity according to rated alternating current voltage class and equipment parameters, and determine the total group number of the alternating current energy consumption branches and the capacity of each group of the alternating current energy consumption branches; a redundancy group configuration module configured to configure a group of redundancy AC power consuming branches, the redundancy AC power consuming branches having the same capacity as the AC power consuming branches, and The alternating current energy consumption branch circuit resistance configuration module is configured to simulate the running state of the power system, and the resistance of each group of alternating current energy consumption branch circuits is determined by taking the standard that the alternating current energy consumption can absorb all surplus power when the alternating current voltage is reduced to the maximum.
7. The arrangement as set forth in claim 6, wherein the AC power consumption is arranged at the new power station at the transmitting end, each AC power consumption branch is composed of a resistor of an angle connection and an anti-parallel thyristor connected in series, and the parameters of the resistor and the anti-parallel thyristor connected to the three angle connection circuits are identical.
8. The apparatus of claim 6, wherein the means for obtaining the total ac power consumption comprises means for obtaining the total ac power consumption to be configured, Obtaining allowable surplus power P gx of an alternating current power grid; And obtaining the total alternating current energy consumption capacity PMAX=P mz -P gx to be configured according to the allowable surplus power P gx of the alternating current power grid, wherein P mz is the flexible direct current rated transmission capacity.
9. The configuration device according to claim 6, wherein the total number of groups of AC power consuming branches and the capacity allocation module allocates the total AC power consuming capacity according to rated AC voltage levels and equipment parameters to determine the total number of groups of AC power consuming branches and the capacity of each group of AC power consuming branches, including, And comprehensively considering the rated alternating-current voltage grade of the secondary side of the energy-consuming transformer, the current-resistant capability of a thyristor for switching the alternating-current energy-consuming branch, the short-time overload capacity of the energy-consuming transformer and the rated capacity of the flexible direct-current system, determining the capacity P h of each group of alternating-current energy-consuming branch and the number N h of groups of the hanging alternating-current energy-consuming branches of each energy-consuming transformer, wherein the total number of groups of the alternating-current energy-consuming branch is N h x k, k is the number of the energy-consuming transformers, and the product of the capacity of each group of alternating-current energy-consuming branches and the total number of groups of the alternating-current energy-consuming branches is equal to the total capacity of the alternating-current energy consumption.
10. The configuration device of claim 6, wherein the AC power dissipation branch resistance configuration module simulates an operational state of the power system, and determines a resistance of each set of AC power dissipation branches based on a criterion that the AC power dissipation can absorb all surplus power when the AC voltage is reduced to a maximum, including, Constructing a simulation model of the power system; the simulation model operates under a full-power working condition, and all alternating current energy consumption branches are put into the simulation model to obtain power consumed by a single group of alternating current energy consumption branches; And adjusting the resistance value of the alternating current energy consumption branch circuit to ensure that the capacity of a single group of alternating current energy consumption branch circuits reaches the capacity of each group of alternating current energy consumption branch circuits determined in the prior art, wherein the resistance value at the moment is the resistance of the alternating current energy consumption branch circuits required to be determined.
11. A switching method of alternating current energy consumption is characterized by comprising the following steps, Determining the number of groups of the whole input alternating current energy consumption branches and the initial phase shift angle of a phase shift switching group according to surplus power, so that the total capacity of the input alternating current energy consumption branches and the surplus power capacity of the power are different in a set range, wherein the alternating current energy consumption branches adopt anti-parallel thyristors to switch resistors, the switching mode comprises whole switching without a trigger angle and phase shift switching with a trigger angle, and only one group is allowed to switch the phase shift at the same time; According to the change condition of the electrical quantity, the alternating current energy consumption input capacity is regulated through phase shifting; When the alternating current energy consumption branch circuit is withdrawn, each group is sequentially phase-shifted and cut according to the impact requirement of the power system or the matching requirement of the power system and the stable control cutting machine.
12. The switching method according to claim 11, wherein determining the number of groups of the total input AC power consuming branches based on the surplus power comprises, Determining the total input group number N Z according to the downward rounding result of dividing surplus power by the capacity of a single group of alternating current energy consumption branches, , Wherein PY is surplus power, and P h is the capacity of a single group of alternating current energy consumption branches; Wherein, the surplus power is obtained by the following steps, When the power consumption is carried out by the overvoltage of the transmitting end, surplus power is the running power of the flexible direct current system or is obtained by calculation according to the overvoltage level of the transmitting end: When the alternating current fault of the transmitting end converter station passes through, surplus power is the whole running power of the flexible direct current system; when the transmitting-end converter is locked, surplus power is the total power of the converter locked by the flexible direct current system, namely single valve operation power when a single valve is locked, single pole operation power when a single pole is locked, and all operation power when a double pole is locked: When the direct current line fails, surplus power is the operation power of the failed pole, namely the operation power of the failed pole in the case of single-pole fault ride-through, and the operation power of all the operation powers in the case of double-pole fault ride-through.
13. The method of switching as set forth in claim 11, wherein determining an initial phase shift angle of the phase shift switching group based on the surplus power comprises, Obtaining surplus power according to surplus power Wherein PY is surplus power, P h is single-group alternating current energy consumption branch capacity, and N Z is integral input group number; According to the residual surplus power, the corresponding trigger angle is obtained by looking up a table, namely the initial phase shifting angle of the phase shifting switching group, wherein, a two-dimensional table required by looking up the table is obtained according to the following method, And (3) simulating to obtain surplus power of the corresponding single-group alternating-current energy consumption branch circuits when different trigger angles are obtained, and fitting data of the trigger angles and the surplus power of each group to obtain a two-dimensional table of the surplus power of the trigger angles and the single-group alternating-current energy consumption branch circuits.
14. The method of claim 11, wherein the overall switching without a firing angle comprises, The alternating current energy consumption branch circuit directly triggers the thyristors which bear positive pressure in the anti-parallel thyristors at the unlocking moment according to the received unlocking signal, and after unlocking, the thyristors which bear positive pressure after the zero crossing point are triggered at the zero crossing point, and the triggering pulses of the forward and reverse thyristors are 180 degrees different after unlocking; the phase-shifting switching mode with the triggering angle comprises, The alternating current energy consumption branch circuit immediately and directly triggers the thyristors bearing positive pressure in the anti-parallel thyristors at the unlocking moment according to the received unlocking signal, after unlocking, trigger pulses are applied to the thyristors bearing positive pressure after zero crossing with the triggering angles of zero crossing zones, and after unlocking, the triggering pulses of the forward and reverse thyristors are 180 degrees different.
15. The switching method according to claim 14, wherein the zero crossing point is determined according to the method, Detecting the zero crossing point of the alternating current voltage of the main network, and converting the zero crossing point of the energy consumption resistance side of the energy consumption transformer according to the wiring mode of the alternating current energy consumption branch transformer; The positive pressure is applied after the zero crossing point is judged according to the following method, And detecting the AC voltage of the main network, converting the AC voltage of the energy dissipation resistor side of the energy dissipation transformer according to the wiring mode of the AC energy dissipation branch transformer, and judging whether the transformer bears positive pressure after zero crossing.
16. The switching method according to claim 11, wherein the AC power consumption input capacity is adjusted by phase shifting according to the change of the electric quantity, comprising, PI control is carried out on the direct-current voltage of the transmitting end and the fixed value of the energy consumption voltage of the complementary switching, and a phase shift change angle delta alpha is obtained: When the trigger angle of the phase shifting group is reduced, namely alpha-delta alpha|=0, the second group is shifted by 180 DEG (-delta alpha| -alpha), when the trigger angle of the second group is reduced, the third group is shifted by 180 DEG (-delta alpha| -alpha-180 DEG), and the like, wherein the later phase shifting angle is 180 DEG (-delta alpha| -alpha-n-180 DEG), and n is the number of groups for phase shifting until the phase shifting change angle delta alpha becomes positive; The phase shift change angle delta alpha is positive, the trigger angle of the first group of phase shift groups is changed from alpha to alpha+delta alpha, when the trigger angle of the phase shift groups is added, namely alpha+delta alpha=180 degrees, the phase shift is carried out on the second group, the phase shift angle is delta alpha- (180 degrees-alpha), when the trigger angle of the second group is added, the phase shift is carried out on the third group, the phase shift angle is delta alpha- (180 degrees+180 degrees-alpha), and the like, and the phase shift angle is delta alpha- (n.180 degrees-alpha) after the phase shift, wherein n is the number of groups for carrying out the phase shift, and the phase shift is cleared until the phase shift change angle delta alpha becomes negative; The method comprises the steps of switching the fixed value of the power consumption voltage according to the overvoltage level, when the direct current voltage of the sending end is larger than the fixed value of the power consumption, the fixed value of the power consumption voltage is equal to the fixed value of the power consumption, when the direct current voltage of the sending end is smaller than the fixed value of the power consumption, the fixed value of the power consumption voltage is equal to the fixed value of the power consumption, wherein the fixed value of the power consumption is larger than the fixed value of the power consumption, and the fixed value of the power consumption is larger than the fixed value of the overvoltage when the direct current voltage of the sending end is in the power consumption.
17. The switching method according to claim 11, wherein each group is sequentially phase-shifted and cut off when exiting the AC power consuming branch, comprising, Determining the total power PTUI needed to exit in the current control period according to the requirement of the energy consumption speed of the excision, and acquiring the power PYTUI consumed by the energy consumption of the currently input phase-shifting group; The phase shift angle is determined from the relationship PTUI and PYTUI, When PTUI is less than or equal to PYTUI, determining a phase shift angle to be adjusted by the phase shift group of the current control period according to PYTUI-PTUI; When PTUI is larger than PYTUI, the current phase shift group is completely removed, and then a group is selected for phase shift according to the relation between PTUI and PYTUI +P h , When PTUI is less than or equal to PYTUI +P h , determining the phase shift angle to be adjusted by the new phase shift group in the current control period according to PYTUI +P h -PTUI; When PTUI is larger than PYTUI +P h , the current phase shifting group is completely removed, and a group is selected for phase shifting, when PTUI is smaller than or equal to PYTUI +2.P h , the PYTUI +2.P h -PTUI is subjected to table lookup to determine the phase shifting angle to be regulated by the new phase shifting group in the current control period; And so on, when the newly selected phase shifting group is the nth group, when PTUI is less than or equal to PYTUI +n.P h , looking up a table for PYTUI +n.P h -PTUI, and determining the phase shifting angle to be regulated by the new phase shifting group in the current control period; and so on until the full power consumption is exited.
18. An alternating current energy consumption switching device is characterized by comprising, The switching module is configured to determine the number of groups of the whole input alternating current energy consumption branches and the initial phase shift angle of the phase shift switching group according to surplus power, so that the total capacity of the input alternating current energy consumption branches and the surplus power capacity are different within a set range; a charge capacity adjustment module configured to adjust an ac power consumption charge capacity by phase shifting according to a change of an electric quantity, and And the energy dissipation module is configured to sequentially phase-shift and cut each group according to the impact requirement of the power system or the matching requirement of the power system and the stable control cutting machine when exiting the alternating current energy dissipation branch.
19. The switching device of claim 18, wherein the switching module determines the number of groups of the overall input AC power consuming branches based on the surplus power, comprising, Determining the total input group number N Z according to the downward rounding result of dividing surplus power by the capacity of a single group of alternating current energy consumption branches, , Wherein PY is surplus power, and P h is the capacity of a single group of alternating current energy consumption branches; Wherein, the surplus power is obtained by the following steps, When the power consumption is carried out by the overvoltage of the transmitting end, surplus power is the running power of the flexible direct current system or is obtained by calculation according to the overvoltage level of the transmitting end: When the alternating current fault of the transmitting end converter station passes through, surplus power is the whole running power of the flexible direct current system; when the transmitting-end converter is locked, surplus power is the total power of the converter locked by the flexible direct current system, namely single valve operation power when a single valve is locked, single pole operation power when a single pole is locked, and all operation power when a double pole is locked: When the direct current line fails, surplus power is the operation power of the failed pole, namely the operation power of the failed pole in the case of single-pole fault ride-through, and the operation power of all the operation powers in the case of double-pole fault ride-through.
20. The switching device of claim 18, wherein the switching module determines an initial phase shift angle of the phase shift switching group based on the surplus power, comprising, Obtaining surplus power according to surplus power Wherein PY is surplus power, P h is single-group alternating current energy consumption branch capacity, and N Z is integral input group number; According to the residual surplus power, the corresponding trigger angle is obtained by looking up a table, namely the initial phase shifting angle of the phase shifting switching group, wherein, a two-dimensional table required by looking up the table is obtained according to the following method, And (3) simulating to obtain surplus power of the corresponding single-group alternating-current energy consumption branch circuits when different trigger angles are obtained, and fitting data of the trigger angles and the surplus power of each group to obtain a two-dimensional table of the surplus power of the trigger angles and the single-group alternating-current energy consumption branch circuits.

Description

Constant volume alternating current energy consumption configuration method, device and equipment Technical Field The invention belongs to the field of power electronic converters, and particularly relates to an isovolumetric alternating current energy consumption configuration method, a switching device and equipment. Background China is faced with strategic adjustment of energy structures, and large-scale development of new energy sources such as wind power, solar energy and the like is currently promoted comprehensively. The large-scale new energy base of our country is mainly distributed in the area of 'three north', is generally at the end of the power grid, has weaker power grid, is thousands of kilometers away from the load center of the middle east, has great open sea wind power development potential in the middle east, but has long offshore distance and lacks power grid support. And the geographical position factor of the new energy power generation field shows the condition of centralized access of new energy sources such as large-scale wind power, photovoltaic and the like. By utilizing the voltage source characteristic of flexible direct current transmission, large-scale new energy can be connected into a power grid through flexible direct current transmission in an island mode, and the feasibility of the power grid is proved by the implementation of flexible direct current power grid test demonstration engineering of +/-500 kV Zhang Bei at present. However, during a soft-straight delivery system failure, the system will generate a lot of surplus power, subject to the soft-straight system power delivery capability degradation and the new energy island power control difficulties. If the surplus power is not controlled in time, the running stability of the power grid and the safety of equipment are seriously threatened. At present, the surplus power control method during the fault period of the soft direct delivery system mainly aims at energy dissipation, and the surplus power of the new energy island injected into the soft direct delivery system is consumed through the alternating current and direct current energy dissipation device during the fault period of the soft direct delivery system. The energy consumption resistor is configured in two modes, namely, AC energy consumption is configured at the transmitting end, and DC energy consumption is configured at the receiving end. The method and the device can well inhibit surplus power during the single-pole locking of the transmitting end and the restarting of the direct-current line fault when the receiving end is configured with direct-current energy consumption, and can well inhibit surplus power during the single-pole locking of the transmitting end, the restarting of the direct-current line fault, the locking of the receiving end and the restarting of the receiving end alternating-current system when the transmitting end is configured with alternating-current energy consumption. Therefore, the current true double-click topological island is flexible and straight, and the power surplus is restrained by adopting a mode of configuring equal volume alternating current energy consumption by a transmitting end. However, when the island flexible straight-out scene is applied to an extra-high voltage high-capacity scene, in order to reduce the group number during equal capacity grouping, the number of the energy consumption resistors is small, so that single group power is high, and serious impact is caused to the power system when the energy consumption resistors exit. In addition, the energy consumption capacity of a single group is large, and direct-current voltage fluctuation and power oscillation phenomena are easily caused by excessive input. The existing grouping design method can only compensate the negative effects (impact and excessive investment) caused by the overlarge power of a single group of energy-consuming resistors by reducing the capacity of the single group of energy-consuming resistors, but reducing the capacity of the single group of energy-consuming resistors can lead to the great increase of the number of energy-consuming resistors, the complexity of an energy-consuming control system, the occupied area and the engineering cost. Therefore, there is a need for a method for configuring and switching energy-consuming resistors that reduces system impact and more closely approximates the required capacity. Disclosure of Invention The invention aims to provide an isovolumetric alternating current energy consumption configuration method, an isovolumetric alternating current energy consumption configuration device, an isovolumetric alternating current energy consumption configuration switching device and a switching device, which are used for realizing the suppression of alternating current and direct current overvoltage after fault ride-through or locking of a modularized multi-level converter and meeting the operation requiremen