Transient stability control method and device for grid-connected inverter based on virtual synchronous machine

A technology of virtual synchronous machine and transient stability, which is applied in the direction of single-network parallel feeding arrangement, photovoltaic power generation, etc., can solve the problem of phase-locked loop loss of stability, to ensure calculation accuracy and efficiency, and improve transient The effect of stability

Pending Publication Date: 2022-05-27
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method relies on a phase-locked loop to acquire the frequency of the grid, and the phase-locked loop may lose stability during voltage sags

Method used

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  • Transient stability control method and device for grid-connected inverter based on virtual synchronous machine
  • Transient stability control method and device for grid-connected inverter based on virtual synchronous machine
  • Transient stability control method and device for grid-connected inverter based on virtual synchronous machine

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Experimental program
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Effect test

Embodiment 1

[0065] Transient stability control method of grid-connected inverter based on virtual synchronous machine

[0066] like figure 1 As shown, the grid-connected inverter is controlled through an active power control loop, a reactive power control loop, and a current and voltage control loop, which is the prior art.

[0067] like figure 2 As shown, the present invention adds an auxiliary control branch on the basis of the existing control method. When the active power control loop realizes control, the reactive power deviation ΔQ and the frequency deviation Δω are multiplied by a multiplier, and then the compensation power ΔP is obtained through a proportional link. v , and finally the compensation power ΔP v Negative feedback to the front end of the active power control loop.

[0068] Compensation power ΔP v It is obtained by the following formula,

[0069] ΔP v =K v (Q-Q ref ) Δω (1)

[0070] In the formula, Δω is the frequency deviation, K v is the proportional coef...

Embodiment 2

[0104] Control device for improving transient stability of grid-connected inverter

[0105] like figure 2 As shown, it includes an active power control loop, a reactive power control loop and a virtual synchronous machine, the virtual synchronous machine is based on the grid voltage phase angle reference value θ output by the active power control loop and the reactive power control loop ref and the reference voltage amplitude U ref , output the PMW signal through pulse width modulation to control the grid-connected inverter, the active power control loop is provided with a control branch, and the control branch includes a proportional module and a multiplier; the control branch performs the following controls,

[0106] When the active power control loop realizes control, the reactive power deviation ΔQ and the frequency deviation Δω are multiplied by a multiplier, and then the compensation power ΔP is obtained through a proportional link. v , and finally the compensation po...

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Abstract

The invention relates to a grid-connected inverter transient stability control method and device based on a virtual synchronous machine, and the method comprises the steps: controlling a grid-connected inverter through an active power control loop, a reactive power control loop and the virtual synchronous machine, the reactive power deviation delta Q and the frequency deviation delta omega are multiplied through a multiplier, compensation power delta Pv is obtained through a proportional element, and finally the compensation power delta Pv is fed back to the front end of an active power control ring in a negative feedback mode. According to the method, the transient stability of the networking type grid-connected inverter can be effectively improved, and the method is easy to implement.

Description

technical field [0001] The invention relates to a transient stability control method and device of a grid-connected inverter based on a virtual synchronous machine. Background technique [0002] Voltage source inverters (VSIs) are widely used as grid interfaces in renewable energy systems, distributed generation systems, and electrified transportation systems to convert direct current to alternating current. But the VSI may operate under severe three-phase voltage dips due to short-circuit faults, etc. [0003] At present, the research on the transient stability of grid-connected VSI during voltage sag mainly focuses on the grid-connected VSI and the grid-connected VSI using vector control. Due to the small short-circuit rate (SCR) of the weak grid, the phase-locked loop in the grid-following VSI is prone to lose stability during grid voltage dips. The networked VSI does not contain a phase-locked loop, which is equivalent to a controlled voltage source. There are several ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/48H02J3/50
CPCH02J3/48H02J3/50Y02E10/56
Inventor 程鹏李孔源马静贾利民
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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