CN-121981049-A - Novel simulation method and system of saturation transformer, storage medium and electronic equipment

Abstract

The invention discloses a novel simulation method and system of a saturated transformer, wherein the method comprises the steps of establishing a basic equivalent circuit of three nodes of the saturated transformer, wherein the basic equivalent circuit comprises a first node, a second node and a third node, the first node and the second node are electric connection ports, the third end is a ground end port, the first node and the second node form a first branch comprising leakage resistance and leakage reactance, the second node and the third node form a second branch, the first branch and the second branch are associated, the first node and the third node form a third branch and a fourth branch respectively, the third branch and the fourth branch are provided with a 1/2 controlled current source respectively, the first node and the third node form a fifth branch and a sixth branch respectively, the fifth branch and the sixth branch are provided with a 1/2G transformer total leakage conductance respectively, and the saturated transformer is simulated based on the basic equivalent circuit.

Inventors

• Leng Chongming
• ZHANG YAN
• SUN YUNTAO
• LIU ZIXIN
• ZHANG YAN
• LI XIAOLONG
• YANG DONGYUE
• Niu Ruidan
• ZHOU GANG
• ZHANG GUOLIANG
• MA ZHIYONG
• PENG LI
• ZHUO GUYING
• YU DANWEN
• CAO WENJUN
• Pang Runtian
• LI LEI
• QIAO XIAOMIN
• CHEN XUJIANG
• WANG XIANGXU
• SUN LIXIANG
• XU SHUWEN
• TIAN PENGFEI
• WANG FENG
• XU YIZHENG
• WANG PIN
• CHENG YU
• ZHENG WEIJIE
• WANG YUE
• WU CHANG
• NIU LINLIN
• GAO MINLI
• HE YONGJING
• PENG HONGYING
• WANG XIAOXIAO
• YU YI
• WU DISHEN
• MU QING
• LI ZHUANG
• XU DECHAO
• LIU MIN
• LI FUCUN

Assignees

• 中国电力科学研究院有限公司
• 国网山东省电力公司电力科学研究院

Dates

Publication Date

20260505

Application Date

20251231

Claims (12)

1. 1. A novel simulation method for a saturation transformer, the method comprising: establishing a three-node basic equivalent circuit of the saturation transformer, wherein the basic equivalent circuit comprises a first node, a second node and a third node, the first node and the second node are electrical wiring ports, and the third end point is a ground port; The formation of the first node and the second node comprises a first branch of leakage resistance and leakage reactance, the formation of the second node and the third node comprises a second branch, and the first branch and the second branch are related; the first node and the third node, the second node and the third node respectively form a third branch and a fourth branch, and the third branch and the fourth branch are respectively provided with a 1/2 controlled current source; The first node and the third node, the second node and the third node respectively form a fifth branch and a sixth branch, and the fifth branch and the sixth branch are respectively provided with a 1/2G transformer total leakage guide; And simulating the saturated transformer based on the basic equivalent circuit.
2. 2. The method of claim 1, further comprising simulating a saturation transformer based on the base equivalent circuit: initializing an inductance current and a 1/2 controlled current source current in the basic equivalent circuit based on an initial voltage and an initial current of a transformer; Solving the initialized basic equivalent circuit to obtain node voltages of all nodes and branch current of all branches in the basic equivalent circuit; calculating virtual node voltage of a transformer excitation branch based on the node voltage and the branch current; Integrating the virtual node voltage to obtain an excitation branch flux linkage; substituting the excitation branch flux linkage into a saturation curve, and calculating the total controlled current source in the basic equivalent circuit.
3. 3. The method of claim 2, further comprising iteratively simulating a saturation transformer based on the calculated total controlled current source.
4. 4. The method of claim 2, wherein integrating the virtual node voltage to obtain an excitation branch flux linkage comprises: Ψ n+1 ＝Ψ n +(U n+1 +U n )Δt/2 Wherein, ψ n is the excitation branch flux linkage of the nth simulation time step, ψ n+1 is the excitation branch flux linkage of the n+1th simulation time step, U n is the excitation branch virtual node voltage of the nth true time step, U n+1 is the excitation branch virtual node voltage of the n+1th true time step, Δt is the simulation time step.
5. 5. The method of claim 4, wherein substituting the excitation branch flux linkage into a saturation curve calculates a total controlled current source in the base equivalent circuit, comprising: i=f(Ψ) Wherein, ψ is the excitation branch flux linkage.
6. 6. A novel simulation system for a saturation transformer, the system comprising: The device comprises a building unit, a first node, a second node and a third node, wherein the building unit is used for building a basic equivalent circuit of three nodes of the saturation transformer, and the basic equivalent circuit comprises the first node, the second node and the third node; The formation of the first node and the second node comprises a first branch of leakage resistance and leakage reactance, the formation of the second node and the third node comprises a second branch, and the first branch and the second branch are related; the first node and the third node, the second node and the third node respectively form a third branch and a fourth branch, and the third branch and the fourth branch are respectively provided with a 1/2 controlled current source; The first node and the third node, the second node and the third node respectively form a fifth branch and a sixth branch, and the fifth branch and the sixth branch are respectively provided with a 1/2G transformer total leakage guide; And the simulation unit is used for simulating the saturated transformer by the basic equivalent circuit.
7. 7. The system of claim 6, wherein the simulation unit for simulating the saturation transformer based on the base equivalent circuit comprises: initializing an inductance current and a 1/2 controlled current source current in the basic equivalent circuit based on an initial voltage and an initial current of a transformer; Solving the initialized basic equivalent circuit to obtain node voltages of all nodes and branch current of all branches in the basic equivalent circuit; calculating virtual node voltage of a transformer excitation branch based on the node voltage and the branch current; Integrating the virtual node voltage to obtain an excitation branch flux linkage; substituting the excitation branch flux linkage into a saturation curve, and calculating the total controlled current source in the basic equivalent circuit.
8. 8. The system of claim 7, wherein the simulation unit is further configured to iteratively simulate a saturated transformer based on the calculated total controlled current source.
9. 9. The system of claim 7, wherein the simulation unit for integrating the virtual node voltage to obtain an excitation branch flux linkage comprises: Ψ n+1 ＝Ψ n +(U n+1 +U n )Δt/2 Wherein, ψ n is the excitation branch flux linkage of the nth simulation time step, ψ n+1 is the excitation branch flux linkage of the n+1th simulation time step, U n is the excitation branch virtual node voltage of the nth true time step, U n+1 is the excitation branch virtual node voltage of the n+1th true time step, Δt is the simulation time step.
10. 10. The system of claim 9, wherein the simulation unit for substituting the excitation branch flux linkage into a saturation curve, calculates a total controlled current source in the base equivalent circuit, comprises: i=f(Ψ) Wherein, ψ is the excitation branch flux linkage.
11. 11. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any of claims 1-5.
12. 12. An electronic device, comprising: the computer-readable storage medium of claim 11, and One or more processors configured to execute the programs in the computer-readable storage medium.

Description

Novel simulation method and system of saturation transformer, storage medium and electronic equipment Technical Field The invention relates to the technical field of electromagnetic transient modeling and simulation of power systems, in particular to a novel simulation method, system, storage medium and electronic equipment of a saturation transformer. Background Electromagnetic transient simulation plays an important role in power system analysis, and can simulate transient processes in a power system, such as short circuit faults, switching operation and the like. However, compared with the electromechanical transient simulation, the electromagnetic transient simulation in the prior art has the defect of excessively large calculation amount, so that the calculation is time-consuming and occupies relatively more resources. The main reason is that in electromagnetic transient simulation, the time consumption for solving is long due to the fact that the order of the node admittance matrix is too high. And when the saturation simulation is processed, the node admittance matrix is changed, so that the node admittance matrix is required to be solved again, and the calculated amount is increased more. There is therefore a need for a method of rapidly emulating a saturated transformer. Disclosure of Invention The technical scheme of the invention provides a novel simulation method and system for a saturated transformer, which are used for solving the problem of how to rapidly simulate the saturated transformer. In order to solve the above problems, the present invention provides a novel simulation method of a saturation transformer, the method comprising: establishing a three-node basic equivalent circuit of the saturation transformer, wherein the basic equivalent circuit comprises a first node, a second node and a third node, the first node and the second node are electrical wiring ports, and the third end point is a ground port; The formation of the first node and the second node comprises a first branch of leakage resistance and leakage reactance, the formation of the second node and the third node comprises a second branch, and the first branch and the second branch are related; the first node and the third node, the second node and the third node respectively form a third branch and a fourth branch, and the third branch and the fourth branch are respectively provided with a 1/2 controlled current source; The first node and the third node, the second node and the third node respectively form a fifth branch and a sixth branch, and the fifth branch and the sixth branch are respectively provided with a 1/2G transformer total leakage guide; And simulating the saturated transformer based on the basic equivalent circuit. Preferably, the method further comprises simulating a saturation transformer based on the base equivalent circuit: initializing an inductance current and a 1/2 controlled current source current in the basic equivalent circuit based on an initial voltage and an initial current of a transformer; Solving the initialized basic equivalent circuit to obtain node voltages of all nodes and branch current of all branches in the basic equivalent circuit; calculating virtual node voltage of a transformer excitation branch based on the node voltage and the branch current; Integrating the virtual node voltage to obtain an excitation branch flux linkage; substituting the excitation branch flux linkage into a saturation curve, and calculating the total controlled current source in the basic equivalent circuit. Preferably, the method further comprises performing iterative simulation on the saturation transformer based on the calculated total controlled current source. Preferably, the integrating the virtual node voltage to obtain an excitation branch flux linkage includes: Ψn+1＝Ψn+(Un+1+Un)Δt/2 Wherein, ψ n is the excitation branch flux linkage of the nth simulation time step, ψ n+1 is the excitation branch flux linkage of the n+1th simulation time step, U n is the excitation branch virtual node voltage of the nth true time step, U n+1 is the excitation branch virtual node voltage of the n+1th true time step, Δt is the simulation time step. Preferably, said substituting the excitation branch flux linkage into a saturation curve, calculating a total controlled current source in the base equivalent circuit, includes: i=f(Ψ) Wherein, ψ is the excitation branch flux linkage. Based on another aspect of the present invention, the present invention provides a novel simulation system for a saturation transformer, the system comprising: The device comprises a building unit, a first node, a second node and a third node, wherein the building unit is used for building a basic equivalent circuit of three nodes of the saturation transformer, and the basic equivalent circuit comprises the first node, the second node and the third node; The formation of the first node and the second node comprises a first branch of leakage resist