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Method and system for three-phase PQ control based on adaptive notch filter under condition of three-phase imbalance

An adaptive notch filter and three-phase technology, which is applied in the direction of reducing the asymmetry of the multi-phase network, eliminating/reducing the asymmetry of the multi-phase network, and arranging the parallel feeding of the single network, can solve the problems of performance degradation and achieve comprehensive Effects of performance improvement, interference suppression of voltage fluctuations, and small amount of internal calculations

Inactive Publication Date: 2015-08-26
STATE GRID CORP OF CHINA +1
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Problems solved by technology

However, due to the constraints of the performance of the phase-locked loop and the shortcomings of the dq transformation, the performance of the classic PQ control method will be reduced to a certain extent when the public grid side is in a three-phase unbalanced situation

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  • Method and system for three-phase PQ control based on adaptive notch filter under condition of three-phase imbalance

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

[0030] The invention discloses a three-phase PQ control method based on an adaptive notch filter under the condition of three-phase unbalance. The method includes the following steps:

[0031] (1) Collect the three-phase voltage u(t) on the public grid side and perform ANF processing on it to obtain the orthogonal transformation u′(t) of the three-phase voltage u(t) on the public grid side;

[0032] (2) According to the three-phase voltage u(t) on the public grid side and its orthogonal transformation u′(t), the positive sequence component u of the three-phase voltage on the public grid side is calculated by the following formula + (t);

[0033] u + (t)=A 2 u(t)+A 1 u'(t)

[0034] Among them, A 1 and A 2 is a constant matrix:

[0035]

[0036] (3) According to the positive sequence component u of the three-phase voltage u(t...

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Abstract

The invention discloses a method and a system for three-phase PQ control based on an adaptive notch filter under the condition of three-phase imbalance. The system comprises a sequence component decomposition module and a three-phase PQ grid-connected control module. The sequence component decomposition module converts three-phase voltage on a public supply network side to positive-sequence components. According to the received positive-sequence components of the three-phase voltage on the public supply network side, and an input active power set value, a reactive power set value, and a grid-connected current measured value, the three-phase PQ grid-connected control module firstly generates a grid-connected current reference value, and then calculates the difference value of the grid-connected current reference value and the grid-connected current measured value, and finally, the difference value is sent to a PWM signal generator through a PID controller, so as to generate a PWM signal used to control a photovoltaic power generation system. Comprehensive properties of the system are obviously improved than that of an existing strategy, a photovoltaic power generation system can output in preset power is realized. Even though the public supply network side has certain fluctuation, the system can safely and stably operate with a public supply network in a grid-connected manner.

Description

technical field [0001] The invention belongs to the technical field of grid-connected control of photovoltaic power generation, and in particular relates to a three-phase PQ control method and system based on an adaptive notch filter when the public grid side is in a three-phase unbalanced situation. Background technique [0002] At present, solar energy, as a clean energy, has been paid more and more attention by people, and the photovoltaic power generation system has gradually changed from the original independent operation to grid-connected operation. The selection of PQ is the core link. For this reason, researchers have studied a variety of control methods. Among them, the PQ control method has received extensive attention because of its flexibility, reliability and selectivity. The current classic PQ control method extracts the public grid side information through the phase-locked loop, processes the information by dq transformation, and then obtains the control signa...

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Application Information

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IPC IPC(8): H02J3/38H02J3/26H02J3/16
CPCY02E40/30Y02E40/50
Inventor 郭磊周志清王宗耀赵慧超
Owner STATE GRID CORP OF CHINA
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