Control method for virtual synchronous generator with reactive compensation function under symmetrical voltage sag

A synchronous generator and generator control technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, AC network voltage adjustment, etc., can solve problems such as voltage sag, three-phase unbalance, harmonic distortion, etc. , to achieve the effect of suppressing the sudden increase of current, increasing the acceleration area, and facilitating recovery

Active Publication Date: 2018-10-23
JIANGSU LINYANG ENERGY CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are still relatively few studies on the control strategy of virtual synchronous generators in the case of grid abnormalities.
During the actual operation of the actual power system, faults such as voltage sag, three-phase unbalance and harmonic distortion often occur, which have a negative impact on the continuous operation of the VSG (Virtual Synchronous Generator) and the stability of the power grid.
At the same time, the traditional VSG does not have the ability to suppress the fault current in the case of a grid fault, and it cannot provide reactive power support

Method used

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  • Control method for virtual synchronous generator with reactive compensation function under symmetrical voltage sag
  • Control method for virtual synchronous generator with reactive compensation function under symmetrical voltage sag
  • Control method for virtual synchronous generator with reactive compensation function under symmetrical voltage sag

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Embodiment

[0108] In order to verify the effectiveness of the virtual synchronous generator control strategy with reactive power compensation function under the condition of grid symmetrical voltage sag, the following methods are used: figure 1 As shown in the topological structure, the corresponding simulation model is built in Matlab / Simulink for simulation verification. The main control parameters and main circuit parameters are shown in Table 1.

[0109] Table 1 The main parameters of the improved virtual synchronous discharge machine control simulation

[0110] Main circuit parameters

value

Control parameters

value

Filter inductance L / mH

6

Moment of inertia J / (kg·m 2 )

0.2

Filter capacitor C / μF

20

Damping coefficient D

10

DC bus voltage U dc / V

700

Adjustment coefficient K ω

25

AC rated voltage U N / V

311

Adjustment coefficient K j

0.2

Adjustment coefficient K d

10...

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Abstract

The invention discloses a control method for a virtual synchronous generator with a reactive compensation function under symmetrical voltage sag, which belongs to the field of microgrid power qualitycontrol. The method comprises the steps that for an overcurrent phenomenon caused by a symmetrical voltage sag fault in a power grid, a given voltage amplitude E0 and power grid voltage value U are selected in a reactive-voltage regulation control loop to ensure that fault current is within a reasonable range during the voltage sag of the power grid; and in an active-frequency control structure, aconstant given power value is improved to an adaptive value which varies according to the voltage variation of the power grid, which reduces surge current caused by imbalance between required power and VSG output power. A reactive power reference value setting method is provided. Reactive power support is provided for the power grid with the maximum capacity of VSG, which is beneficial to the voltage recovery of the power grid. The control method provided by the invention makes up for the blank of the control policy of the virtual synchronous generator when the power grid fails, and improvesthe stability of a system.

Description

technical field [0001] The invention relates to a control method of a virtual synchronous generator with a reactive power compensation function under a symmetrical voltage sag, and belongs to the field of power quality control of a microgrid. Background technique [0002] Due to the existence of rotating parts, the traditional synchronous generator has a moment of inertia. When the power grid fails, the synchronous generator can release the kinetic energy stored in the rotating parts to the power grid, thereby ensuring the stability of the power grid. However, due to the gradual increase in the penetration rate of distributed power sources, traditional inverters without damping and inertia have become the main interface for them to be connected to the power grid. adverse effects. [0003] In recent years, a new inverter control method, the virtual synchronous generator control strategy, has attracted extensive attention from scholars at home and abroad. The basic idea is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/18H02J3/16H02J3/46
CPCH02J3/16H02J3/1821H02J3/38H02J3/46Y02E40/30
Inventor 裴骏郑建勇曾繁鹏闵卫东叶曙光顾雷鸣余运俊顾盼盼缪惠宇杨赟
Owner JIANGSU LINYANG ENERGY CO LTD
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