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Control Method for Suppressing Subsynchronous Oscillation Based on Decoupling Control of Voltage Source Converter

A subsynchronous oscillation and voltage source technology, applied in the direction of reducing/preventing power oscillation, etc., can solve problems such as subsynchronous oscillation and unreasonable controller design

Inactive Publication Date: 2020-07-10
STATE GRID CORP OF CHINA +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of the prior art, the object of the present invention is a control method for suppressing subsynchronous oscillation based on the decoupling control of voltage source converters, aiming at solving the problems caused by independent active power and non-active power of power electronic equipment in voltage source converter grid-connected systems. Unreasonable power controller design leads to the problem of subsynchronous oscillation. The present invention directly corrects the current decoupling control parameters, which can effectively suppress subsynchronous oscillation in a wide frequency range

Method used

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  • Control Method for Suppressing Subsynchronous Oscillation Based on Decoupling Control of Voltage Source Converter
  • Control Method for Suppressing Subsynchronous Oscillation Based on Decoupling Control of Voltage Source Converter
  • Control Method for Suppressing Subsynchronous Oscillation Based on Decoupling Control of Voltage Source Converter

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

[0030] attached figure 1 It is a schematic block diagram of the control structure of the voltage source converter grid-connected system. in:

[0031] 1 is the actual circuit of the voltage source converter grid-connected system, including the voltage source grid-connected converter, filter, connecting line, and system common connection PCC point;

[0032] 2 is the three-phase voltage E of the common connection PCC point of the system where the voltage source converter is located a ,E b ,E c acquisition module;

[0033] 3 is the voltage source converter connected to the system public connection PCC point line three-phase current i ca i cb i cc acquisition module;

[0034] 4 is the abc / dq coordinate transformation module, the fundamental positive sequence phase angle θ obtained by the PLL phase-locked loop g As a benchmark, using the transf...

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Abstract

The invention discloses a voltage source type converter decoupling control-based sub-synchronous oscillation suppression control method. According to the method, voltage source converter current decoupling control is adopted to change a relation between the output current and voltage of a convertor, so that a relation between the electromagnetic torque increment and rotation speed increment of a synchronous machine at adjacent joints can be changed; damping for any frequencies is set to be a positive value; and the parameters of an additional sub-synchronous oscillation suppression control loop in the corresponding current decoupling control are set, so that sub-synchronous oscillation can be suppressed. According to the method of the invention, on the basis of the converter decoupling control, it only needs to set the parameters of the additional sub-synchronous oscillation suppression control loop or directly modify decoupling control parameters, so that a positive damping suppression effect can be realized for any frequencies, and additional acquisition and filtering of voltage and current signals in a power grid are not required, and engineering implementation costs are low.

Description

technical field [0001] The invention belongs to the field of power system stability control, and more specifically relates to a subsynchronous oscillation suppression control method based on decoupling control of a voltage source converter. Background technique [0002] In recent years, the development of new energy sources such as wind farms and photovoltaic power stations in my country has shown the characteristics of large-scale development, centralized grid connection, and long-distance transmission. Many lines have been built and operated in China. Although these power electronic equipment have fast control characteristics of independent active and reactive power, if the controller design is not reasonable, it is easy to cause subsynchronous oscillation of nearby synchronous units, resulting in damage to the shafting of the generator, and even seriously threatening the safe operation of the power system. [0003] The existing subsynchronous oscillation suppression metho...

Claims

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 袁小明张美清李娟崔智超苗淼
Owner STATE GRID CORP OF CHINA
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