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Transformerless STATCOM (Static Compensator) topological structure based on MMC (Modular Multilevel Converter)

A technology of topology and transformer, applied in output power conversion device, reactive power adjustment/elimination/compensation, conversion of AC power input to DC power output, etc. problem, to achieve the effect of reducing unit volume and cost, reducing equipment cost, and reducing manufacturing cycle

Inactive Publication Date: 2011-04-13
RONGXIN POWER ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reactive power compensation devices in the prior art all convert DC voltage into three-phase AC power and then send it to the power grid through a transformer. The design of the transformer makes the equipment investment large, occupying a large area, high cost, and long production cycle.

Method used

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  • Transformerless STATCOM (Static Compensator) topological structure based on MMC (Modular Multilevel Converter)
  • Transformerless STATCOM (Static Compensator) topological structure based on MMC (Modular Multilevel Converter)
  • Transformerless STATCOM (Static Compensator) topological structure based on MMC (Modular Multilevel Converter)

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Embodiment Construction

[0023] See figure 1 , a MMC-based transformerless STATCOM topology consisting of three phases connected in star form. Each phase is composed of n standard power units of modular multilevel converte modular multilevel inverters connected in series. One end of the standard power units after series connection is connected together, and the other end is connected to the inductance L; the inductance L is connected to the charging resistor R, After the charging resistor R is connected in parallel with the switch K2, it is connected to the power grid through another switch K1. The standard power unit is charged through the charging resistor R and capacitor C (see figure 2 ) power supply, providing the DC side voltage of the standard power unit.

[0024] See figure 2 , the standard power unit of the inverter is composed of two switching devices IGBT and a DC side capacitor C, the switching devices IGBT1 and IGBT2 are connected in series, and then the DC capacitor C is connected i...

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Abstract

The invention relates to a transformerless STATCOM (Static Compensator) topological structure based on MMC (Modular Multilevel Converter), which comprises three phases; each phase is formed by connecting standard power units of a plurality of modular multilevel converters in series; after series connection, one ends of the standard power units are connected one another, and the other ends are connected with an inductor; the inductor is connected with a charging resistor; and after being connected with a switch in parallel, the charging resistor is accessed to a power grid via another switch. The standard power units adopt the charging resistor and a capacitance to supply DC side voltage. The invention has the advantages that by adopting the structure, a transformer parallel in a traditional STATCOM can be omitted, and therefore achieving the purposes of cost reduction, space saving and simple structure.

Description

technical field [0001] The invention relates to a transformerless STATCOM topology based on an MMC (Modular Multilevel Converter) modular multilevel inverter. Background technique [0002] In the power system, reactive power is an important factor affecting voltage stability. It is related to the safe and stable operation of the entire power system. Reactive power compensation is one of the effective measures to ensure the efficient and reliable operation of the power system. [0003] The transformation of the distribution network across the country is in full swing. The most practical way to solve the problem of large active power loss and large voltage drop in the current power grid, especially the low-voltage urban and rural power grids, is to use high-performance reactive power compensation devices. Compensate the inductive reactive power of the load, reduce the transmission of reactive power on the line, reduce the active power loss and voltage drop on the power transmi...

Claims

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Application Information

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IPC IPC(8): H02J3/18
CPCY02E40/12Y02E40/16H02M2007/4835H02J3/1864Y02E40/10H02M7/4835
Inventor 张坤杨洋赵淑玉张跃平胡涛李太峰魏西平王振
Owner RONGXIN POWER ELECTRONICS
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