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External centralized distributed photovoltaic power generation cluster resonance suppression system and suppression method

A distributed photovoltaic and resonance suppression technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the problems of increasing system energy loss and affecting the voltage quality of grid-connected points, so as to increase system damping, facilitate practical engineering applications, and adapt to strong effect

Inactive Publication Date: 2016-12-14
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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Problems solved by technology

The input of actual resistance in the passive resonance suppression device will increase the energy loss of the system, and will also affect the voltage quality of the grid-connected point

Method used

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  • External centralized distributed photovoltaic power generation cluster resonance suppression system and suppression method
  • External centralized distributed photovoltaic power generation cluster resonance suppression system and suppression method
  • External centralized distributed photovoltaic power generation cluster resonance suppression system and suppression method

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Embodiment Construction

[0049] The external centralized distributed photovoltaic power generation cluster resonance suppression system and suppression method of the present invention will be described in detail below in conjunction with the embodiments and the accompanying drawings.

[0050] Such as figure 1 As shown, the external centralized distributed photovoltaic power generation cluster resonance suppression system of the present invention includes a distributed photovoltaic power generation cluster 1 and a converter 2, and the distributed photovoltaic power generation cluster 1 and the converter 2 pass through the distribution network line 7 is incorporated into the distribution network, and the converter 2 is connected with a central control unit 3 for controlling the output current of the converter 2 to achieve the purpose of resonance suppression, that is, the output of the converter 2 is controlled by the central control unit 3 current, to achieve the purpose of resonance suppression. Whe...

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Abstract

The invention relates to an external centralized distributed photovoltaic power generation cluster resonance suppression system and suppression method. A distributed photovoltaic power generation cluster and a converter are both merged into a power distribution network through a power distribution network line, the converter is connected with a central control unit, the central control unit is formed by a DC voltage controller, a current controller and a resonance controller, the signal output terminal of the current controller is connected with the input terminal of the converter, the input terminal of the current controller is connected with the signal output terminals of the DC voltage controller and the resonance controller and the actual output current of the converter, the signal input terminal of the DC voltage controller is connected with the capacitor voltage reference value Udcref at the DC side of the converter and the capacitor actual voltage value Udc at the DC side of the converter, and the signal input terminal of the resonance controller is connected with the actual voltage Upcc of the power distribution network line. According to the invention, unfavorable influence of the access of the photovoltaic cluster to the steady-state error and the robust performance of a conventional PR controller is avoided. The external centralized distributed photovoltaic power generation cluster resonance suppression system is simple and easy to achieve, and can adapt to the operation condition of the active power distribution network well.

Description

technical field [0001] The invention relates to a method for suppressing the resonance of a photovoltaic power generation cluster. In particular, it relates to an external centralized distributed photovoltaic power generation cluster resonance suppression system and suppression method. Background technique [0002] In recent years, my country's distributed photovoltaic has shown the characteristics of continuous development and cluster grid connection. The fluctuation, intermittent and random characteristics of photovoltaic power generation make the output of photovoltaic cluster system contain voltage and current with rich harmonic spectrum. At the same time, there are a large number of LCL filters in the distributed photovoltaic power generation cluster system, which constitute a complex high-order electrical network with the impedance of the distribution network, so that there are a large number of inherent resonance points in the photovoltaic cluster system. Therefore,...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/38
CPCH02J3/00H02J3/002H02J3/383Y02E10/56
Inventor 李鹏夏曼于航李鑫明黄仁乐徐绍军孙健常乾坤
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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