CN-122000907-A - Power supply recovery method for power distribution system with reorganizable intelligent soft switch based on partition function switching

CN122000907ACN 122000907 ACN122000907 ACN 122000907ACN-122000907-A

Abstract

The invention discloses a power supply recovery method of a power distribution system with a reconfigurable intelligent soft switch based on partition function switching, which comprises the steps of 1, constructing a reconfigurable intelligent soft switch topology based on a mode switching module and a converter recombination module, 2, establishing a mathematical model of the reconfigurable intelligent soft switch, 3, establishing a power supply recovery model of the power distribution system with the reconfigurable intelligent soft switch under line faults, and 4, converting the power supply recovery model of the power distribution system with the reconfigurable intelligent soft switch under line faults into a mixed integer second order cone planning constraint and then solving to obtain a power distribution system operation scheme comprising the actions of the reconfigurable soft switch and controllable switches. The invention utilizes the recombined intelligent soft switch to break through the capacity limit of the transmission power of the multi-terminal traditional intelligent soft switch, so as to improve the load recovery rate and effectively reduce the influence of line faults on a power distribution system.

Inventors

YANG XIAODONG
SUN LICHENG
ZHANG SHIHAN
HU ZHENGLI
YANG YUE
ZHAO SHUANG
YANG ZHIQING
LI HELONG
DING LIJIAN
LOU WEI

Assignees

合肥工业大学

Dates

Publication Date: 20260508
Application Date: 20260211

Claims (6)

1. The power supply recovery method of the power distribution system with the reconfigurable intelligent soft switch based on partition function switching is characterized by comprising the following steps of: Step 1, constructing a reconfigurable intelligent soft switch, which comprises K function selection modules, G converter reconfiguration modules and G converters; The kth function selection module controls four relay switches according to the input level S ~ So as to switch the operation modes of the four ports of the recombinant intelligent soft switch R-SOP, wherein k=1, 2,; when the input level is When the function selection module is in operation, the function selection module processes S and outputs the 1 st control level Level 2 of control 3 Rd control level Control level 4 And respectively give the corresponding four relay switches ~ So that the 1 st relay switch And 4 th relay switch Switch-off of the 2 nd relay switch And 3 rd relay switch Closing so that 4 ports of the reconfigurable intelligent soft switch R-SOP work in SOP mode when the input level is When the function selection module is in operation, the function selection module processes S and outputs the 1 st control level Level 2 of control 3 Rd control level Control level 4 And respectively give the corresponding four relay switches ~ So that the 1 st relay switch And 4 th relay switch Closing, 2 nd relay switch And 3 rd relay switch The method comprises the steps of switching off, so that 4 ports of the reconfigurable intelligent soft switch R-SOP work in an SOP mode; The g-th converter reconfiguration module utilizes decoder pairs High and low levels ~ Processing to obtain the level of e relay switches containing only one high level ~ Thereby according to ~ Respectively control itself Status of individual relay switches ~ The one state of the two converters is a closed state, so that a feeder line connected with a relay switch corresponding to the closed state is conducted with a converter VSC corresponding to a G-th converter recombination module, and the capacity of the conducted converter VSC is distributed to the corresponding feeder line, g=1, 2. Represent the first The high and low levels of the voltage are used, Represent the first The level of the individual relay switches, Represent the first The state of the individual relay switches; step 2, constructing constraint conditions of a power supply recovery model of the power distribution system containing the reorganizable intelligent soft switch R-SOP; Step 3, constructing an objective function of a power distribution system power supply recovery model containing a reorganizable intelligent soft switch R-SOP based on partition function switching ; And 4, converting a power supply recovery model of the power distribution system with the reconfigurable intelligent soft switch R-SOP based on partition function switching into a mixed integer second order cone planning constraint and then solving to obtain a power distribution system operation scheme comprising the actions of the reconfigurable intelligent soft switch R-SOP and the actions of all switches.
2. The power restoration method for a power distribution system including a reorganizable intelligent soft switch based on partition function switching according to claim 1, wherein the step 2 includes: Step 2.1, constructing constraint conditions of the recombinant intelligent soft switch R-SOP by the formula (1) -formula (10): (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) in the formulas (1) to (10), 、 Respectively representing a node set communicated with the voltage source converter and a set of all tie switches; The number of the voltage source converters is the number; Represent the first The voltage source converters are arranged in Node for communicating with voltage source converter at moment Are connected; Representation of Node communicated with voltage source converter at moment The state of all the connected tie switches; Representation of Node communicated with voltage source converter at moment The state of all the connected tie switches; Representation of Node communicated with voltage source converter at moment The state of all the connected tie switches; Representative of Node communicated with voltage source converter at moment Maximum apparent power transmitted by all connected feeders; Is the first Capacity of the individual voltage source converters; 、、 respectively represent Time node Active power, reactive power and direct current side power transmitted by all connected voltage source converters; Representative of Time node Active losses on all voltage source converters connected; Is the loss coefficient; Representative of Time of day (time) A plurality of tie switch states; Representative of Node communicated with voltage source converter at moment Is a voltage of (2); Representative of Node communicated with voltage source converter at moment The port opening state of the recombination type intelligent soft switch R-SOP; a reference voltage for the power distribution system; M is a constant; Step 2.2, constructing a virtual power flow constraint condition of the power distribution system reconstruction by the formula (11) -formula (14): (11) (12) (13) (14) in the formulae (11) - (14), Representative of Time node Sum node Branches between 0-1 Integer variable whether connected; Is that Time branch Is a virtual tide of (2); Is that Time node The power flow sent by the virtual power supply is treated; Is a node Is a virtual requirement of (1); The number of the nodes in the power distribution system; Is a collection of all nodes in the power distribution system; Step 2.3, constructing a power flow constraint condition of the power distribution system containing the reconfigurable intelligent soft switch R-SOP based on partition function switching under line fault by the formula (15) -formula (25): (15) (16) (17) (18) (19) (20) (21) (22) (23) (24) (25) in the formulae (15) - (25); And Respectively is Time branch Active and reactive power of the upper transmission; And Respectively branch circuits Resistance and reactance of (a); And Respectively is Time node Active and reactive power injected; And Is that Time node An amount of active and reactive load reduction; Is that Time node Is a voltage of (2); Is that Time branch A current transmitted on; 、 Respectively is Time node The active force and the active reduction amount of the photovoltaic PV; Is that Time node Reactive power output of the photovoltaic PV; And Respectively is Time node Active and reactive power consumed by the load; And Is that Time node Active power and reactive power injected by the recombination type intelligent soft switch R-SOP; And Respectively an upper limit and a lower limit of node voltage in the power distribution system; An upper limit for branch current in the power distribution system; for branches in distribution systems Upper limit of tidal power.
3. The method for recovering power of power distribution system with reorganizable intelligent soft switch based on partition function switching as claimed in claim 2, wherein in step 3, an objective function is constructed by formula (26) -formula (27) : (26) (27) In the formulae (26) to (27), , Respectively representing the loss and load reduction of the power distribution system; Is the total number of time instants.
4. The method for recovering power of a power distribution system with a reorganizable intelligent soft switch based on partition function switching according to claim 3, wherein the step 4 comprises the following steps: Step 4.1. Non-linear variables are subjected to And Respectively replaced by two linear variables And And relaxing the formulas (15) -18, 21) -22) by using a big-M method, thereby obtaining the linear constraint after conversion by using the formulas (28) -33): (28) (29) (30) (31) (32) (33) in the formulae (28) to (33), And Respectively are provided with Time node Square of voltage at, Time node To the node The middle branch Square of the current of (2); Step 4.2 converting equation (33) to a second order cone constraint using equation (34): (34) in formula (41), T represents a transpose; Step 4.3, decoupling the power and the current transmitted by the branch by adopting a big-M method, so that the converted linear constraint is obtained by using a formula (35) -a formula (37): (35) (36) (37) step 4.4 converting equation (5) to a rotation cone constraint using equation (38): (38)。
5. An electronic device comprising a memory and a processor, wherein the memory is configured to store a program that supports the processor to perform the power restoration method of any one of claims 1-4, the processor being configured to execute the program stored in the memory.
6. A computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor performs the steps of the power restoration method according to any of claims 1-4.

Description

Power supply recovery method for power distribution system with reorganizable intelligent soft switch based on partition function switching Technical Field The invention belongs to the field of power distribution system operation optimization, and particularly relates to a power supply recovery method for a power distribution system based on a reorganizable intelligent soft switch R-SOP to cope with line faults. Background With the scale expansion of the power distribution system and the high-proportion access of renewable energy sources, the system operation complexity is increased, and conventional fault events such as line faults and the like are frequent, so that the power supply reliability is seriously affected. The traditional fault recovery method mainly depends on network reconstruction, distributed power regulation and control and the like, but is limited by the number of switching actions, power capacity and topology flexibility, and is difficult to realize rapid and full recovery of load under a complex fault scene. The intelligent soft switch is used as a novel power electronic device, has the capability of flexibly regulating and controlling tide and supporting voltage, and has potential in fault recovery. However, the conventional SOP is connected in a mode of replacing a tie switch, the power transmission capability of the conventional SOP is limited by the fixed capacity of the voltage source converter, and when the conventional SOP faces a large-scale power loss area, the recovery effect is often limited due to insufficient capacity. Therefore, a power supply recovery method capable of breaking through the VSC capacity limit is urgently needed to improve the self-healing capability and toughness of the power distribution system under the line fault. Disclosure of Invention The invention aims to solve the defects in the prior art, provides a power supply recovery method of a power distribution system with a reorganizable intelligent soft switch based on partition function switching, and aims to realize effective recovery of the power distribution system under a line fault by coordinating the reorganizable intelligent soft switch with a controllable switch, so that the recovery capability of the system under extreme conditions can be improved. In order to achieve the aim of the invention, the invention adopts the following technical scheme: the invention discloses a power supply recovery method of a power distribution system with a reorganizable intelligent soft switch based on partition function switching, which is characterized by comprising the following steps: Step 1, constructing a reconfigurable intelligent soft switch, which comprises K function selection modules, G converter reconfiguration modules and G converters; The kth function selection module controls four relay switches according to the input level S ~So as to switch the operation modes of the four ports of the recombinant intelligent soft switch R-SOP, wherein k=1, 2,; when the input level is When the function selection module is in operation, the function selection module processes S and outputs the 1 st control levelLevel 2 of control3 Rd control levelControl level 4And respectively give the corresponding four relay switches~So that the 1 st relay switchAnd 4 th relay switchSwitch-off of the 2 nd relay switchAnd 3 rd relay switchClosing so that 4 ports of the reconfigurable intelligent soft switch R-SOP work in SOP mode when the input level isWhen the function selection module is in operation, the function selection module processes S and outputs the 1 st control levelLevel 2 of control3 Rd control levelControl level 4And respectively give the corresponding four relay switches~So that the 1 st relay switchAnd 4 th relay switchClosing, 2 nd relay switchAnd 3 rd relay switchThe method comprises the steps of switching off, so that 4 ports of the reconfigurable intelligent soft switch R-SOP work in an SOP mode; The g-th converter reconfiguration module utilizes decoder pairs High and low levels~Processing to obtain the level of e relay switches containing only one high level~Thereby according to~Respectively control itselfStatus of individual relay switches~The one state of the two converters is a closed state, so that a feeder line connected with a relay switch corresponding to the closed state is conducted with a converter VSC corresponding to a G-th converter recombination module, and the capacity of the conducted converter VSC is distributed to the corresponding feeder line, g=1, 2.Represent the firstThe high and low levels of the voltage are used,Represent the firstThe level of the individual relay switches,Represent the firstThe state of the individual relay switches; step 2, constructing constraint conditions of a power supply recovery model of the power distribution system containing the reorganizable intelligent soft switch R-SOP; Step 3, constructing an objective function of a power distribution system power supply r