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Filter circuit for series part of SSSC (static synchronous series compensator) and UPQC (unified power quality conditioner) and control method of filter circuit

A filter circuit and control method technology, applied in electrical components, output power conversion devices, etc., can solve problems such as increased cost pressure, and achieve the effects of suppressing current change rate, strong versatility, and good compensation effect

Inactive Publication Date: 2014-03-05
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using UPQC alone can provide an effective solution for small-capacity occasions, but for large-capacity requirements, the cost pressure increases sharply. The cost-effective solution, the series part is mainly used for the treatment of power quality problems, and provides a high-impedance path for the load harmonic current to prevent the load harmonic current from flowing into the system

Method used

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  • Filter circuit for series part of SSSC (static synchronous series compensator) and UPQC (unified power quality conditioner) and control method of filter circuit
  • Filter circuit for series part of SSSC (static synchronous series compensator) and UPQC (unified power quality conditioner) and control method of filter circuit
  • Filter circuit for series part of SSSC (static synchronous series compensator) and UPQC (unified power quality conditioner) and control method of filter circuit

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Embodiment Construction

[0057] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0058] Because the output impedance control of the series part of SSSC and UPQC is the most basic control method. This kind of control method is generally an open-loop control. Considering the voltage drop of the coupling transformer and the error of the inverter output, adding the inverter tracking control link can effectively improve the control accuracy. Whether there is a new type of filter on the output side is very important to the control performance and cost of the device. The filter mainly has a great influence on the design of the inverter voltage tracking control link. Therefore, before adding the new filter circuit, it is necessary to consider the control scheme including the series part of the new filter circuit SSSC and UPQC.

[0059] Taking SSSC as an example, after adding a new type of filter, the contro...

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Abstract

The invention relates to a filter circuit, and in particular relates to a filter circuit for a series part of an SSSC (static synchronous series compensator) and a UPQC (unified power quality conditioner) and a control method of the filter circuit. The filter circuit is connected with a series part at an inverter side of the SSC or a series part of an inverter side of the UPQC; the filter circuit comprises an LC (launch controller) filter circuit, a phi-type filter circuit, an LCC (launch control center) or LCCR (liquid crystal display contrast control register) series-parallel filter circuit, an LCL (lower control limit) series-parallel filter circuit and a C-type filter. The filter circuit adopting an RCL (recoilless launcher) series-parallel resonance way is used for filtering high-frequency harmonic waves of current generated in an SSSC converter or a UPQC converter, the overlarge current reducing rate can be inhibited, the output precision of the device can be improved, and the performance of the device can be improved.

Description

technical field [0001] The invention relates to a filter circuit, in particular to a filter circuit used in the series connection of SSSC and UPQC and a control method thereof. Background technique [0002] Static Synchronous Series Compensator SSSC (Static Synchronous Series Compensator) is a static synchronous reactive power compensation device without an external power supply. It is connected in series to the transmission line to generate a voltage that is orthogonal to the line current and has a controllable amplitude. It can change the line voltage level and its own Putting in and out of the state, so as to adjust the grid structure and topology state, generally do not change the line voltage level and basic topology structure, but equivalently adjust the line impedance and voltage. [0003] The main circuit of unified power quality controller UPQC is composed of series voltage source converter and parallel voltage source converter. As a powerful comprehensive power qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12
Inventor 贲宝强燕翚叶卫华訾振宁许潇
Owner STATE GRID CORP OF CHINA
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