Distribution network voltage drop compensation control method for photovoltaic grid connection

A voltage sag, compensation control technology, applied in photovoltaic power generation, AC network voltage adjustment, AC network circuit and other directions, to achieve the effect of improving accuracy and accuracy

Inactive Publication Date: 2017-06-27
CHANGZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to propose a voltage drop compensation control method for a photovoltaic grid-connected distribution network in view of the problem that the unified power quality regulator in the prior art cannot effectively regulate the power quality of a photovoltaic grid-connected distribution network , the method utilizes the unified power quality regulator and the PI ultra-short feedback control method based on the endocrine feedback system theory to timely and effectively compensate the voltage drop of the photovoltaic grid-connected distribution network

Method used

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Embodiment 1

[0042] The photovoltaic grid-connected distribution network voltage drop compensation control method of this embodiment is implemented through the existing unified power quality controller (hereinafter referred to as UPQC), and the photovoltaic grid-connected distribution network is controlled by using the PI ultra-short feedback control method based on the endocrine feedback system. Compensate for grid voltage drop.

[0043] Such as figure 2 As shown, the distribution network system containing photovoltaics is composed of mains distribution network, grid-connected photovoltaics and nonlinear loads. Unit 3, the way UPQC is connected to the photovoltaic grid-connected distribution network is as follows: figure 2 shown. The power supply unit 3 is mainly composed of a photovoltaic array and a battery device connected to it, and is used to provide UPQC's own working power.

[0044] see image 3 The specific functional modules of the UPQC involved in voltage drop compensation...

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Abstract

The method invention provides a distribution network voltage drop compensation control method for photovoltaic grid connection. The method is implemented by a UPQC and comprises the following steps of: 1, acquiring a voltage signal; 2, conditioning the acquired signal; 3, calculating a voltage compensation instruction by sampling a voltage signal, processing the voltage compensation instruction by using an endocrine feedback system PI ultra-short feedback control method and then outputting a PWM wave; and 4, according to a voltage compensation control PWM signal, outputting corresponding compensation voltage in order to compensate the voltage of the distribution network. In a conventional PI control method of the UPQC for distribution network voltage drop compensation, a ultra-short feedback processing unit established on the basis of a body neuroendocrine feedback system gland hormone feedback regulation theory is used to assist the PI control, thereby improving the precision and accuracy of voltage drop compensation control of UPQC, which provides a new method for the power quality management of a PV-containing distribution network by the UPQC.

Description

technical field [0001] The invention relates to the field of power quality monitoring and control of a distribution network, in particular to a method for compensating and controlling the voltage drop of a photovoltaic grid-connected distribution network by using a unified power quality regulator. Background technique [0002] The grid-connected power generation of new energy represented by photovoltaics and the increasing nonlinear load on the grid have made the grid pollution more and more serious, seriously affecting the power supply quality of the grid. In the face of new problems in the distribution network, traditional power quality management methods are becoming more and more obvious. Powerless. Unified Power Quality Conditioner (UPQC for short) is a combination of voltage-type compensation device, current-type compensation device and energy storage device, which can not only improve the quality of power supply on the grid side, but also prevent current harmonics on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/12
CPCH02J3/12H02J3/383H02J2203/20Y02E10/56
Inventor 刘建军马振国苏佳华倪福银王琪李正明
Owner CHANGZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER
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