CN-121995787-A - Electromagnetic transient simulation delay compensation method, system, medium and equipment for electric power equipment

Abstract

The invention provides an electromagnetic transient simulation delay compensation method, system, medium and equipment for electric equipment, which comprise the steps of obtaining current of a controlled source equivalent circuit formed when a bridge arm in the electric equipment introduces a controlled voltage source, wherein the controlled source equivalent circuit carries out equivalent replacement on capacitance of a capacitance equivalent circuit of the bridge arm, calculating a circuit state characteristic root of the controlled source equivalent circuit by utilizing a delay function corresponding to the controlled voltage source based on the current, and carrying out delay compensation based on the circuit state characteristic root of the controlled source equivalent circuit and the obtained circuit state characteristic root of the capacitance equivalent circuit. And obtaining a circuit state characteristic root of the controlled source equivalent circuit according to the current of the controlled source equivalent circuit and the corresponding delay function, and then realizing the simulation of the controlled voltage source according to the circuit state characteristic root of the controlled source equivalent circuit and the circuit state characteristic root of the capacitance equivalent circuit, so as to ensure the numerical stability of the power electronic equipment system.

Inventors

• GAO LU
• JI FENG
• YAN HEMING
• KOU LONGZE
• PENG YIXUAN
• TANG HAIJUN
• LI FUCUN

Assignees

• 中国电力科学研究院有限公司
• 国家电网有限公司
• 国网山东省电力公司电力科学研究院

Dates

Publication Date

20260508

Application Date

20251201

Claims (20)

1. 1. The electromagnetic transient simulation delay compensation method for the electric power equipment is characterized by comprising the following steps of: Acquiring the current of a controlled source equivalent circuit formed when a bridge arm in the electric power equipment introduces a controlled voltage source, wherein the controlled source equivalent circuit performs equivalent replacement on the capacitance of a capacitance equivalent circuit of the bridge arm; calculating a circuit state characteristic root of the equivalent circuit of the controlled source by utilizing a delay function corresponding to the controlled voltage source based on the current; and performing delay compensation based on the circuit state characteristic root of the controlled source equivalent circuit and the obtained circuit state characteristic root of the capacitance equivalent circuit.
2. 2. The method of claim 1, wherein calculating a circuit state feature root of a controlled source equivalent circuit based on the current using a delay function corresponding to the controlled voltage source, comprises: Converting a delay function corresponding to the controlled voltage source into a first-order inertia representation state equation; Combining the first-order inertia representation state equation and the output equation of the controlled source equivalent circuit to obtain the state equation of the controlled source equivalent circuit; and calculating a circuit state characteristic root of the controlled source equivalent circuit by utilizing a state equation of the controlled source equivalent circuit based on the current and the circuit parameters of the controlled source equivalent circuit.
3. 3. The method of claim 2, wherein the controlled source equivalent circuit state equation satisfies the following formula: In the formula, tau 0 is time delay, C is capacitance value of a capacitor in the controlled source equivalent circuit, L is inductance value of an inductor in the controlled source equivalent circuit, R is resistance value of a resistor in the controlled source equivalent circuit, I is current value in the controlled source equivalent circuit, us is power value in the controlled source equivalent circuit, As a first variable of the controlled source equivalent circuit state equation, A second variable that is a controlled source equivalent circuit state equation; the first-order inertia represents a state equation, satisfying the following formula: 。
4. 4. A method according to claims 1-3, characterized in that the acquisition procedure of the delay function comprises: Acquiring an initial delay function of the controlled voltage source; The initial delay function is subjected to Laplace transformation, and is unfolded according to the Taylor series, so that an unfolding delay function is obtained; and performing approximation processing on the initial expansion function to obtain a final delay function.
5. 5. The method of claim 4, wherein the unwrapping delay function satisfies the formula: In the above-mentioned method, the step of, As a function of the initial time delay, Is a natural exponent, τ 0 is a delay, s is a complex variable in the Laplace transform, and n is a positive integer.
6. 6. The method of claim 1, wherein the controlled voltage source is equivalent to a resistive and inductive element in series, or a resistive and inductive element in parallel.
7. 7. The method of claim 1, wherein the process of obtaining the circuit state feature root of the capacitive equivalent circuit comprises: acquiring a kirchhoff voltage law equation of the capacitance equivalent circuit according to the kirchhoff law; Converting the kirchhoff voltage law equation into a circuit characteristic root equation of the capacitance equivalent circuit; and calculating a circuit state characteristic root of the capacitance equivalent circuit by using the circuit characteristic root equation based on the circuit parameters of the capacitance equivalent circuit.
8. 8. The method of claim 7, wherein the circuit state characteristic root of the capacitive equivalent circuit satisfies the following formula: In the above formula: is the first characteristic root of the circuit state of the capacitance equivalent circuit, The second characteristic root of the circuit state of the capacitance equivalent circuit is that R is the resistance value of a resistor in the capacitance equivalent circuit, C is the capacitance value of a capacitor in the capacitance equivalent circuit, and L is the inductance value of an inductor in the capacitance equivalent circuit.
9. 9. The method of claim 1, wherein the performing delay compensation based on the circuit state characteristic root of the controlled source equivalent circuit and the obtained circuit state characteristic root of the capacitive equivalent circuit comprises: calculating characteristic root deviation based on the circuit state characteristic root of the controlled source equivalent circuit and the obtained circuit state characteristic root of the capacitance equivalent circuit; Generating a voltage source control signal by utilizing the characteristic root deviation; and performing delay compensation according to the control signal by using the controlled voltage source.
10. 10. An electromagnetic transient simulation delay compensation system for electric power equipment, comprising: The current acquisition module is used for acquiring the current of a controlled source equivalent circuit formed when the controlled voltage source is introduced into the electric power equipment, wherein the controlled source equivalent circuit is used for equivalently replacing the capacitance of a capacitance equivalent circuit of a bridge arm in the electric power equipment; The circuit state characteristic root calculation module is used for calculating the circuit state characteristic root of the equivalent circuit of the controlled source by utilizing the delay function corresponding to the controlled voltage source based on the current; And the delay compensation module is used for carrying out delay compensation based on the circuit state characteristic root of the controlled source equivalent circuit and the obtained circuit state characteristic root of the capacitance equivalent circuit.
11. 11. The system according to claim 10, wherein the circuit state feature root computation module is specifically configured to: Converting a delay function corresponding to the controlled voltage source into a first-order inertia representation state equation; Combining the first-order inertia representation state equation and the output equation of the controlled source equivalent circuit to obtain the state equation of the controlled source equivalent circuit; and calculating a circuit state characteristic root of the controlled source equivalent circuit by utilizing a state equation of the controlled source equivalent circuit based on the current and the circuit parameters of the controlled source equivalent circuit.
12. 12. The system of claim 11, wherein the controlled source equivalent circuit state equation satisfies the following formula: In the formula, tau 0 is time delay, C is capacitance value of a capacitor in the controlled source equivalent circuit, L is inductance value of an inductor in the controlled source equivalent circuit, R is resistance value of a resistor in the controlled source equivalent circuit, I is current value in the controlled source equivalent circuit, us is power value in the controlled source equivalent circuit, As a first variable of the controlled source equivalent circuit state equation, A second variable that is a controlled source equivalent circuit state equation; the first-order inertia represents a state equation, satisfying the following formula: 。
13. 13. the system of any one of claims 10-12, further comprising a delay function construction module configured to: Acquiring an initial delay function of the controlled voltage source; The initial delay function is subjected to Laplace transformation, and is unfolded according to the Taylor series, so that an unfolding delay function is obtained; and performing approximation processing on the initial expansion function to obtain a final delay function.
14. 14. The system of claim 13, wherein the unwrapped delay function satisfies the formula: In the above-mentioned method, the step of, As a function of the initial time delay, Is a natural exponent, τ 0 is a delay, s is a complex variable in the Laplace transform, and n is a positive integer.
15. 15. The system of claim 10, wherein the controlled voltage source is equivalent to a resistive and inductive element in series, or a resistive and inductive element in parallel.
16. 16. The system of claim 10, further comprising a circuit state feature root acquisition module for the capacitive equivalent circuit: acquiring a kirchhoff voltage law equation of the capacitance equivalent circuit according to the kirchhoff law; Converting the kirchhoff voltage law equation into a circuit characteristic root equation of the capacitance equivalent circuit; and calculating a circuit state characteristic root of the capacitance equivalent circuit by using the circuit characteristic root equation based on the circuit parameters of the capacitance equivalent circuit.
17. 17. The system of claim 16, wherein the circuit state characteristic root of the capacitive equivalent circuit satisfies the following formula: In the above formula: is the first characteristic root of the circuit state of the capacitance equivalent circuit, The second characteristic root of the circuit state of the capacitance equivalent circuit is that R is the resistance value of a resistor in the capacitance equivalent circuit, C is the capacitance value of a capacitor in the capacitance equivalent circuit, and L is the inductance value of an inductor in the capacitance equivalent circuit.
18. 18. The system according to claim 10, wherein the delay compensation module is specifically configured to: calculating characteristic root deviation based on the circuit state characteristic root of the controlled source equivalent circuit and the obtained circuit state characteristic root of the capacitance equivalent circuit; Generating a voltage source control signal by utilizing the characteristic root deviation; and performing delay compensation according to the control signal by using the controlled voltage source.
19. 19. The electronic equipment is characterized by comprising at least one processor and a memory, wherein the memory and the processor are connected through a bus; The memory is used for storing one or more programs; the electromagnetic transient simulation delay compensation method of an electrical power plant of any of claims 1-9 is implemented when the one or more programs are executed by the at least one processor.
20. 20. A readable storage medium, having stored thereon an execution program, which when executed, implements the electromagnetic transient simulation delay compensation method of an electrical power plant as claimed in any one of claims 1 to 9.

Description

Electromagnetic transient simulation delay compensation method, system, medium and equipment for electric power equipment Technical Field The invention belongs to the technical field of power system simulation, and particularly relates to a method and a system for electromagnetic transient simulation delay compensation of power equipment. Background In electromagnetic transient simulation of power electronic equipment, due to the fact that switching elements are numerous, a large amount of simulation resources are occupied in matrix solving due to topology change caused by frequent movements of the switches, and for electromagnetic transient simulation of complex power electronic equipment, a controlled power supply in the form of Thevenin is usually used for equivalence. However, for some cases, when using a controlled power supply replacement method in a power electronic device, the delay of this time step may cause numerical instability, since the input of the controlled source used comes from the last time step solved by the main circuit. Disclosure of Invention In order to overcome the above-mentioned shortcomings of the prior art, in a first aspect, the present application proposes a method for electromagnetic transient simulation delay compensation of an electrical power device, including: Acquiring the current of a controlled source equivalent circuit formed when a bridge arm in the electric power equipment introduces a controlled voltage source, wherein the controlled source equivalent circuit performs equivalent replacement on the capacitance of a capacitance equivalent circuit of the bridge arm; calculating a circuit state characteristic root of the equivalent circuit of the controlled source by utilizing a delay function corresponding to the controlled voltage source based on the current; and performing delay compensation based on the circuit state characteristic root of the controlled source equivalent circuit and the obtained circuit state characteristic root of the capacitance equivalent circuit. Preferably, the calculating, based on the current, a circuit state feature root of the controlled source equivalent circuit by using a delay function corresponding to the controlled voltage source includes: Converting a delay function corresponding to the controlled voltage source into a first-order inertia representation state equation; Combining the first-order inertia representation state equation and the output equation of the controlled source equivalent circuit to obtain the state equation of the controlled source equivalent circuit; and calculating a circuit state characteristic root of the controlled source equivalent circuit by utilizing a state equation of the controlled source equivalent circuit based on the current and the circuit parameters of the controlled source equivalent circuit. Preferably, the controlled source equivalent circuit state equation satisfies the following formula: In the formula, tau 0 is time delay, C is capacitance value of a capacitor in the controlled source equivalent circuit, L is inductance value of an inductor in the controlled source equivalent circuit, R is resistance value of a resistor in the controlled source equivalent circuit, I is current value in the controlled source equivalent circuit, us is power value in the controlled source equivalent circuit, As a first variable of the controlled source equivalent circuit state equation,A second variable that is a controlled source equivalent circuit state equation; the first-order inertia represents a state equation, satisfying the following formula: 。 Preferably, the process of obtaining the delay function includes: Acquiring an initial delay function of the controlled voltage source; The initial delay function is subjected to Laplace transformation, and is unfolded according to the Taylor series, so that an unfolding delay function is obtained; and performing approximation processing on the initial expansion function to obtain a final delay function. Preferably, the expansion delay function satisfies the following formula: In the above-mentioned method, the step of, As a function of the initial time delay,Is a natural exponent, τ 0 is a delay, s is a complex variable in the Laplace transform, and n is a positive integer. Preferably, the controlled voltage source is equivalent to a series resistance and inductance element, or a parallel resistance and inductance element. Preferably, the process for obtaining the circuit state characteristic root of the capacitance equivalent circuit includes: acquiring a kirchhoff voltage law equation of the capacitance equivalent circuit according to the kirchhoff law; Converting the kirchhoff voltage law equation into a circuit characteristic root equation of the capacitance equivalent circuit; and calculating a circuit state characteristic root of the capacitance equivalent circuit by using the circuit characteristic root equation based on the circuit parameters of the cap