Method for controlling harmonic currents in synchronous rotating reference frame by several times

A technology of synchronous rotation and harmonic current, applied to harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., can solve problems such as signal phase lag and reduce the stability margin of closed-loop control systems

Active Publication Date: 2014-12-03
STATE GRID CORP OF CHINA +3
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Problems solved by technology

The main problem of this method is that when compensating more than two kinds of harmonic currents at the same time, since the SFR not only includes the DC amount, but also includes the AC amount formed by the current component that is not synchronized with the SFR, at this time, it is still impossible to truly realize the PI wireless Static difference control target
For this reason, how to obtain the DC flow in SFR becomes the key issue to determine the performance of this method! The literature proposes a current contr...

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  • Method for controlling harmonic currents in synchronous rotating reference frame by several times
  • Method for controlling harmonic currents in synchronous rotating reference frame by several times
  • Method for controlling harmonic currents in synchronous rotating reference frame by several times

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Embodiment Construction

[0093] The invention discloses a stepwise control method for harmonic current in a synchronous rotating coordinate system. The control method is as follows: Step 1: Establish the mathematical model of the three-phase parallel APF on the synchronous rotating coordinate system. On this basis, Step 2: Analyze the harmonic current sub-level control strategy in the proposed SFR in detail. Step 3 : The control system is analyzed and designed;

[0094] Relevant step 1: Convert a certain harmonic current that needs to be compensated to a synchronous rotating coordinate system with the same rotation speed and direction, make full use of the harmonic command current information on the SFR, and eliminate the SFR in the SFR through simple algorithm transformation The AC disturbance caused by other asynchronous current components is used to extract the DC amount corresponding to the compensation current in the SFR, so as to realize PI no-static-difference decoupling control.

[0095] 1. M...

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Abstract

The invention relates to a method for controlling harmonic currents in a synchronous rotating reference frame by several times. Compensated harmonic currents at a certain time are converted to the synchronous rotating reference frame with the same times of rotating speeds and directions, harmonic instruction current information of an SFR is fully utilized, AC disturbance quantity brought by other nonsynchronous current components in the SFR is removed through a simple algorithm, so that the DC quantity corresponding to the compensated currents at the time in the SFR is extracted, and PI static-error-free decoupling control is achieved. The stability margin and the dynamic response speed of a control system can be effectively improved, and the steady state errors of the system are removed.

Description

technical field [0001] The invention relates to a stepwise control method of harmonic current in a synchronous rotating coordinate system. Background technique [0002] Active Power Filter (APF) is widely used in harmonic suppression and reactive power compensation of distribution network due to its advantages of fast dynamic response, not easy to resonate with grid impedance, and not affected by grid frequency fluctuations. Power Quality Governance Field]. [0003] At present, in the engineering application of APF, in order to enhance the flexibility of harmonic compensation and improve the effect of harmonic compensation, the harmonic current sub-compensation method is usually adopted, that is, only a few specified sub-harmonics in the load current are compensated. Harmonic current sub-compensation control includes two links of detection and control, and there are usually two implementation schemes: [0004] First, batch detection and comprehensive control. [0005] Thi...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 许杏桃许胜陈群王益明李然孙开鹏许杏明沈正彬沈鹏黄文静
Owner STATE GRID CORP OF CHINA
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