CN-122020965-A - Simulation modeling system and method for power electronic equipment

CN122020965ACN 122020965 ACN122020965 ACN 122020965ACN-122020965-A

Abstract

The invention discloses a simulation modeling system and a simulation modeling method of power electronic equipment, wherein the simulation modeling system comprises a new energy and energy storage classification modeling module, a region access characteristic parameter embedding module, a fault control protection strategy integration module, a dynamic coupling algorithm module, an electromagnetic transient simulation core module and a simulation result verification module; the invention constructs a modularized frame according to new energy and network-structured energy storage classification, combines deep embedding of regional access characteristic parameters, solves the problem of insufficient regional pertinence of the traditional model, enables the model to be capable of accurately matching the operation characteristics of grids in different regions, remarkably improves the suitability, integrates typical control protection strategies during faults, establishes a real-time linkage mechanism with electromagnetic transient simulation, and can accurately restore transient electric quantity change when equipment fails by matching with a dynamic coupling algorithm of access characteristic-control strategy-fault response, and the consistency of simulation results and actual scenes is greatly improved.

Inventors

CHEN HUI
SUN RUICHEN
DAI WANG
ZHU YUE
KONG XIANGPENG
LIANG JIANLONG
WANG KAI
ZHOU WANPENG
YANG JIAN
DAI JICHENG
LUO MIN
CHEN DANYANG

Assignees

国网青海省电力公司
国网青海省电力公司经济技术研究院
南京南瑞继保工程技术有限公司

Dates

Publication Date: 20260512
Application Date: 20251226

Claims (10)

1. A simulation modeling system of a power electronic device, comprising: The new energy and energy storage classification modeling module is used for constructing a modularized modeling frame according to the new energy type and the net-structured energy storage type so as to form mutually independent and expandable sub-modules; the regional access characteristic parameter embedding module is used for acquiring regional access characteristic parameters of a power grid and regional characteristic parameters of new energy sources and embedding the parameters into the modularized modeling framework; The fault control protection strategy integration module is used for integrating a control protection strategy during the fault of the power electronic equipment so as to realize the real-time linkage of the control protection strategy and electromagnetic transient simulation; the dynamic coupling algorithm module is used for constructing a dynamic coupling algorithm of access characteristics, a control strategy and fault response so as to restore transient electric quantity change when the power electronic equipment fails; The electromagnetic transient simulation core module is used for executing relay protection electromagnetic transient simulation based on the modularized modeling framework, the embedded region access characteristic parameters, the integrated control protection strategy and the dynamic coupling algorithm; The simulation result verification module is used for acquiring actual fault data and comparing the actual fault data with simulation data to verify the accuracy of the simulation model.
2. A simulation modeling system of a power electronic device as defined in claim 1, The new energy types comprise photovoltaic new energy and wind power new energy; the network-structured energy storage type comprises battery energy storage and flywheel energy storage; The modularized modeling framework comprises a photovoltaic sub-module, a wind electronic module, a battery energy storage sub-module and a flywheel energy storage sub-module, wherein standardized parameter interfaces and data interaction interfaces are arranged on all the sub-modules so as to support flexible expansion and replacement of the sub-modules.
3. A simulation modeling system of a power electronic device as defined in claim 2, wherein, A basic simulation unit comprising a photovoltaic array, an inverter and a filter device is arranged in the photovoltaic sub-module; the wind electronic module is internally provided with a basic simulation unit comprising a wind turbine, a gear box, a generator and a converter; the battery energy storage sub-module and the flywheel energy storage sub-module are internally provided with basic simulation units comprising an energy storage unit, a bidirectional converter and a network construction control unit, and each basic simulation unit is reserved with a control strategy access port and a transient parameter output port.
4. A simulation modeling system of a power electronic device as defined in claim 1, The power grid regional access characteristic parameters comprise power grid voltage grade parameters, power grid short-circuit capacity parameters and power grid wiring mode parameters; The new energy region characteristic parameters comprise wind speed parameters, illumination intensity parameters and environment temperature parameters; Each parameter acquisition is acquired through a power grid dispatching data platform and a new energy station monitoring system, and is stored in a parameter database after data preprocessing; And calculating equivalent access characteristic parameters by adopting a parameter fusion algorithm so as to realize the collaborative embedding of the multidimensional parameters.
5. A simulation modeling system for a power electronic device as claimed in claim 4, wherein the formula of the parameter fusion algorithm is as follows: P eq ＝ω 1 P wind +ω 2 P solar +ω 3 P storage +ω 4 S grid The method comprises the steps of determining a power grid characteristic power parameter, wherein P eq is an equivalent access power parameter and is used for representing comprehensive access capacity under regional characteristics, omega 1 、ω 2 、ω 3 、ω 4 is a weight coefficient of wind power, photovoltaic, energy storage and power grid parameters respectively, determining according to a regional new energy and energy storage access proportion and the power grid characteristics, P wind is a wind power regional characteristic power parameter, calculating the wind power regional characteristic power parameter in real time by combining real-time wind speed data with a wind power curve if the wind power regional characteristic power parameter is dynamically adjusted and modeled in real time, calculating the wind power regional characteristic power parameter based on a regional typical wind speed scene and combining rated capacity of a station with the wind power curve if the wind power regional characteristic power parameter is a non-real-time fixed model, calculating the P solar is a photovoltaic regional characteristic power parameter by calculating regional annual average illumination intensity and photovoltaic module efficiency, P storage is an energy storage regional characteristic power parameter by calculating energy storage installed capacity and charging and discharging efficiency, and S grid is a power grid regional short-circuit capacity parameter and directly taken from power grid dispatching data; The parameter embedding is realized through standardized parameter interfaces of all sub-modules, equivalent access power parameters and original parameters are mapped to basic simulation units corresponding to all the sub-modules respectively, and the model is enabled to adapt to regional power grid operation characteristics by modifying parameter configuration of the basic simulation units.
6. The simulation modeling system of a power electronic device of claim 5, wherein the control protection strategy comprises: The low-voltage ride through control logic comprises a voltage drop detection unit, a reactive power support unit and an off-grid protection unit, wherein the voltage drop detection unit is used for monitoring the voltage amplitude of a power grid in real time, starting the reactive power support unit when the voltage drops to the range of 20% -85% of rated voltage, and outputting corresponding reactive power according to the voltage drop amplitude; The overcurrent protection control logic adopts a hierarchical current limiting strategy and comprises a fault current detection unit and a dynamic current limiting control unit, wherein the fault current detection unit is used for monitoring the output current of equipment in real time, starting a current suppression algorithm through the dynamic current limiting control unit when the current exceeds 1.2-1.5 times of rated current, and limiting the amplitude of the fault current through adjusting the modulation ratio and the power instruction of the current transformer; The control strategy linkage mechanism is established to realize the real-time linkage of the control protection strategy and electromagnetic transient simulation; the control strategy linkage mechanism comprises: the equivalent impedance during the fault is calculated by outputting real-time measurement values of current and voltage through the converter, and the calculation formula is as follows: The system comprises a Z eq , a U meas , an I meas converter, a Z eq and a control strategy, wherein the Z eq is the equivalent impedance of equipment during faults, the U meas is the alternating-current side measurement voltage of the converter, and the I meas converter outputs measurement current; And the control strategy is integrated to the basic simulation unit through the control strategy access port of the sub-module, establishes real-time data interaction with the electromagnetic transient simulation process, and the action instruction of the control strategy directly acts on the running state of the simulation unit, and the transient electric quantity data of the simulation unit is fed back to the control strategy unit in real time so as to realize closed loop linkage.
7. The simulation modeling system of power electronic equipment according to claim 6, wherein the dynamic coupling algorithm takes an access characteristic parameter as an input, takes an action state of a control strategy as an intermediate variable, and takes transient electric quantity of fault response as an output, so as to establish a nonlinear mapping relation among the three; The access characteristic parameters comprise an equivalent access power parameter P eq and an equipment equivalent impedance Z eq during a fault, the action state comprises a coefficient k 1 representing the action degree of a protection device and a coefficient k 2 representing the response time of a control strategy, and the transient electric quantity comprises a fault current i (t) and a transient voltage u (t); the transient electric quantity is calculated by adopting an electromagnetic transient differential equation, and the formula is as follows: The method comprises the steps of calculating I (t) as a fault current instantaneous value at t moment, wherein I 0 is a fault initial current amplitude, 1.0-1.2 times of rated current of equipment before a fault is taken, tau is a current decay time constant and is obtained by calculating an equivalent inductance L and an equivalent resistance R of the equipment, namely tau=L/R, U 0 is a power grid voltage amplitude before the fault, and omega is a power grid angular frequency; for initial phase of current, related to fault type, in case of three-phase short circuit When single-phase grounding fault occurs Z eq is the equivalent impedance of the equipment during the fault period and is taken from the calculation result of the fault control protection strategy integration module, P rated is the rated power of the equipment; The dynamic coupling algorithm dynamically adjusts the transient state electric quantity calculation result by updating the access characteristic parameter and the control strategy state in real time, so that the dynamic linkage of the access characteristic, the control strategy and the fault response is realized, and the transient state change process is consistent with the fault characteristic of the actual equipment.
8. The simulation modeling system of a power electronic device of claim 1, wherein the electromagnetic transient simulation core module is constructed based on an electromagnetic transient simulation platform, comprising: The simulation working condition setting unit supports typical fault working condition configuration, including three-phase short-circuit faults, single-phase grounding faults, two-phase short-circuit faults and two-phase grounding faults, and sets fault occurrence time, fault duration time and fault position parameters; the simulation step control unit is used for adaptively adjusting the simulation step according to the transient change rate, wherein a small step is adopted in a transient change severe stage, and a large step is adopted in a transient stability stage; the simulation operation unit is used for calling each sub-module of the modularized modeling framework, loading the embedded region access characteristic parameters, executing the integrated control protection strategy and running the dynamic coupling algorithm to complete electromagnetic transient simulation operation; the data output unit outputs simulation data of fault current waveforms, transient voltage waveforms, control strategy action time sequences and transient electric quantity peaks and supports data format conversion.
9. The simulation modeling system of power electronic equipment according to claim 7, wherein the actual fault data is obtained through a power grid fault recording system and a new energy station fault recording device and comprises an actual fault current waveform, an actual transient voltage waveform, an actual fault duration and an actual control strategy action record, wherein the actual fault data is synchronously aligned with the simulation data after being preprocessed, and the fault occurrence time is taken as a reference; The method comprises the steps of checking the accuracy of a simulation model through a check index, wherein the check index comprises waveform similarity, peak value error and transient state time error, the waveform similarity is calculated by adopting a correlation coefficient method, and is judged to be qualified when the correlation coefficient is more than or equal to 0.95, the peak value error is the proportion of the difference value between a simulation peak value and an actual peak value to the actual peak value, and is judged to be qualified when the error is less than or equal to 5%, and the transient state time error is the difference value between the simulation transient state stability time and the actual transient state stability time, and is judged to be qualified when the error is less than or equal to 10 ms; If the check index does not reach the qualification standard, generating an optimization instruction, and feeding back to the region access characteristic parameter embedding module to adjust the weight coefficient omega 1 、ω 2 、ω 3 、ω 4 or feeding back to the dynamic coupling algorithm module to optimize the decay time constant tau until the model check is qualified.
10. A modeling method of a simulation modeling system of a power electronic device, comprising: step 1, starting a new energy and energy storage classification modeling module, and constructing a modularized modeling frame according to a new energy type and a net-structured energy storage type to form independent sub-modules; Step 2, collecting regional access characteristic parameters of a power grid and regional characteristic parameters of new energy through a regional access characteristic parameter embedding module, and embedding the parameters into corresponding sub-modules of the modularized modeling framework; step 3, integrating the low-voltage ride-through control logic and the overcurrent protection control logic into a modularized modeling framework through a fault control protection strategy integration module, and establishing a linkage mechanism of a control protection strategy and electromagnetic transient simulation; step 4, constructing a dynamic coupling algorithm of access characteristics, a control strategy and fault response through a dynamic coupling algorithm module, and determining a transient state electric quantity calculation model; step 5, starting an electromagnetic transient simulation core module, executing relay protection electromagnetic transient simulation based on the modularized modeling framework, the integrated control protection strategy and the dynamic coupling algorithm after embedding parameters, and outputting simulation data; And 6, acquiring actual fault data through a simulation result checking module, comparing and analyzing the simulation data with the actual fault data, checking the accuracy of the simulation model, and returning to the step 2 to adjust the embedded parameters or returning to the step 4 to optimize the dynamic coupling algorithm if the accuracy requirement does not reach the preset accuracy requirement.

Description

Simulation modeling system and method for power electronic equipment Technical Field The invention belongs to the technical field of power system automation, and particularly relates to a simulation modeling system and method for power electronic equipment. Background With the continuous improvement of the permeability of new energy sources (photovoltaic, wind power and the like) and network-structured energy storage (battery energy storage, flywheel energy storage and the like) in a power grid, the power supply structure and the operation characteristics of the power system are fundamentally changed. The power electronic equipment is used as a core interface for accessing new energy and energy storage into a power grid, and the transient response characteristic of the power electronic equipment during the fault period directly influences the action reliability of the relay protection device. The traditional simulation model is mainly designed in a unified modeling mode, access differences of different types of power electronic equipment cannot be adapted because of no classification design according to new energy types and network-structured energy storage characteristics, adaptability to power grids in different areas is insufficient because of no embedding of power grid regional access characteristic parameters, deviation between simulation results and actual scenes is large, control protection strategies (such as low-voltage ride-through and overcurrent protection control logic) during equipment faults and electromagnetic transient simulation processes lack effective linkage, transient response under the action of the control strategies cannot be truly reduced, dynamic coupling mechanisms among access characteristics, control strategies and fault responses are lacked, transient electrical quantity change rules during equipment faults are difficult to accurately reproduce, and accuracy of relay protection analysis is further affected. Disclosure of Invention The invention aims to provide a simulation modeling system and a simulation modeling method for power electronic equipment, which construct a modularized frame according to new energy and network-structured energy storage classification, by combining with the deep embedding of regional access characteristic parameters, the problem of insufficient regional pertinence of the traditional model is solved, so that the model can be accurately matched with the operation characteristics of power grids in different regions, and the suitability is remarkably improved. In order to solve the above technical problems, the present invention provides a simulation modeling system for power electronic equipment, including: The new energy and energy storage classification modeling module is used for constructing a modularized modeling frame according to the new energy type and the net-structured energy storage type so as to form mutually independent and expandable sub-modules; the regional access characteristic parameter embedding module is used for acquiring regional access characteristic parameters of a power grid and regional characteristic parameters of new energy sources and embedding the parameters into the modularized modeling framework; The fault control protection strategy integration module is used for integrating a control protection strategy during the fault of the power electronic equipment so as to realize the real-time linkage of the control protection strategy and electromagnetic transient simulation; the dynamic coupling algorithm module is used for constructing a dynamic coupling algorithm of access characteristics, a control strategy and fault response so as to restore transient electric quantity change when the power electronic equipment fails; The electromagnetic transient simulation core module is used for executing relay protection electromagnetic transient simulation based on the modularized modeling framework, the embedded region access characteristic parameters, the integrated control protection strategy and the dynamic coupling algorithm; The simulation result verification module is used for acquiring actual fault data and comparing the actual fault data with simulation data to verify the accuracy of the simulation model. Preferably, the new energy source type comprises a photovoltaic new energy source and a wind power new energy source; the network-structured energy storage type comprises battery energy storage and flywheel energy storage; The modularized modeling framework comprises a photovoltaic sub-module, a wind electronic module, a battery energy storage sub-module and a flywheel energy storage sub-module, wherein standardized parameter interfaces and data interaction interfaces are arranged on all the sub-modules so as to support flexible expansion and replacement of the sub-modules. Preferably, a basic simulation unit comprising a photovoltaic array, an inverter and a filtering device is arranged in the photovoltaic sub-module; the