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A kind of upqc coordinated control method and system

A coordinated control system and coordinated control technology, applied in AC network voltage adjustment, AC network load balancing, reactive power compensation, etc., can solve problems such as unreliable voltage compensation on the distribution network side

Active Publication Date: 2021-11-16
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +5
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a UPQC coordinated control method to solve the problem that the traditional UPQC-based power quality control method of the power grid cannot reliably compensate the drop of the distribution network side voltage

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  • A kind of upqc coordinated control method and system
  • A kind of upqc coordinated control method and system
  • A kind of upqc coordinated control method and system

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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] like figure 1 As shown, it is a system structure diagram based on the Unified power quality conditioner (UPQC), its main structure is composed of energy storage devices, series converters, and parallel converters connected back to back. figure 2 for figure 1 The corresponding UPQC system topology diagram.

[0039] UPQC is equipped with a control system for related control of UPQC. In order to facilitate the description of the coordinated control strategy provided by the present invention, the control system is called UPQC coordinated control system. The core of the control system lies in an internal control module. The control module is loaded with a coordinated control strategy, which is used to control the UPQC for coordinated control when the voltage on the side of the distribution network drops.

[0040] Therefore, the focus of the present inve...

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Abstract

The invention relates to a UPQC coordinated control method and system. When the voltage on the distribution network side drops, the compensation output voltage of the series converter is controlled to be the rated voltage of the series converter, which can ensure that the amplitude of the load side voltage remains constant. It ensures that the compensation voltage and compensation power of the series converter does not exceed the limit of its rated value, so that the series converter operates in the rated state, and the series converter is used to the maximum extent, so that the series converter and the parallel converter are used. The current transformers share the load power, and when the voltage on the distribution network side drops, the energy storage device begins to provide the load with the active power required for the voltage drop. Under the action of the energy storage device, the output of the parallel converter is controlled. The corresponding compensation output current compensates the distribution network side current to the active component of the load side current under normal working conditions, so as to prevent the increase of the feeder current when the voltage drops, which can effectively avoid the risk of overcurrent when the voltage drops.

Description

technical field [0001] The invention relates to a UPQC coordinated control method and system, belonging to the technical field of UPQC-based power grid control. Background technique [0002] With the continuous improvement of the penetration rate of distributed power represented by wind power and photovoltaics in the power grid, and the wide access of nonlinear loads, modern distribution networks are more susceptible to different power quality problems such as voltage sags and fluctuations, and current distortions. interference. In order to comprehensively solve voltage and current quality problems, a unified power quality conditioner (Unified powerquality conditioner, UPQC) provides a practical solution. UPQC combines the functions of series and parallel active filters, which can guarantee the voltage quality of the load side and the current quality of the system side at the same time. It is a customized power technology device that can effectively control power quality pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/16H02J3/32
CPCH02J3/16H02J3/32Y02E40/30
Inventor 黄弘扬黄晓明苗世洪黄利军刘子文许丹李献伟吕文韬王雷涛楼平范志华管敏渊
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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