Reactive power compensation device of double-H-bridge modular multilevel converter (MMC) structure under three-phase unbalance and control method of reactive power compensation device

A compensating device and balancing technology, which is applied in the direction of reactive power compensation, reactive power adjustment/elimination/compensation, output power conversion device, etc., can solve the problems of low system efficiency, poor energy flow, poor safety and stability, etc. , to achieve good compensation effect, suppression of circulating current, and low switching loss

Inactive Publication Date: 2016-04-13
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of poor energy

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  • Reactive power compensation device of double-H-bridge modular multilevel converter (MMC) structure under three-phase unbalance and control method of reactive power compensation device
  • Reactive power compensation device of double-H-bridge modular multilevel converter (MMC) structure under three-phase unbalance and control method of reactive power compensation device
  • Reactive power compensation device of double-H-bridge modular multilevel converter (MMC) structure under three-phase unbalance and control method of reactive power compensation device

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[0062] The specific embodiments of the present invention are described with reference to the accompanying drawings. Figure 17 with Figure 26 As shown, the reactive power compensation device with a dual H-bridge MMC structure under three-phase unbalance of the present invention includes: a main control part and a driving unit, the main control part includes a first controller and a second controller, the first A controller includes a positive and negative sequence separation unit, a positive sequence current control loop, a negative sequence current control loop, a first modulation unit 16 and a capacitor voltage sorting unit 17, the positive sequence output terminal and the negative sequence output of the positive sequence separation unit The terminals are respectively connected to the positive sequence current control loop and the negative sequence current control loop. The output terminal of the positive sequence current control loop and the output terminal of the negative se...

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Abstract

The invention discloses a reactive power compensation device of a double-H-bridge modular multilevel converter (MMC) structure under three-phase unbalance and a control method of the reactive power compensation device, and relates to a reactive power compensation device of an MMC and a control method of the reactive power compensation device. The invention aims to solve the problems of poor energy mobility among three phases, low system working efficiency and poor safety and stability existing in the reactive power compensation device in the prior art when a three-phase power grid is at a voltage unbalance state. In the reactive power compensation device, a first controller of a master control part adopts a double-loop control strategy based on positive and negative sequence separation of feedforward decoupling to generate a three-phase modulation signal, a driving signal is generated by a voltage sequencing control method based on carrier phase shifting, and a second controller adopts the combination of a balance control strategy on capacitive voltage of a second H-bridge unit and a control strategy for suppressing system circulation to generate the three-phase modulation signal on the basis of positive and negative sequence separation on the circulation. By the reactive power compensation device, operation can be rapidly, safely and stably carried out under the condition of the unbalance of the power grid.

Description

technical field [0001] The invention relates to an MMC reactive power compensation device and a control method thereof, in particular to a reactive power compensation device with a double H-bridge MMC structure under three-phase unbalance and a control method thereof, and belongs to the technical field of reactive power compensation. Background technique [0002] Electric energy is an energy necessary for people's life, and its coverage and application degree represent the comprehensive national strength of our country. With the rapid development of power electronics technology, it has been widely used in the power field, and because of the increasing unbalanced and nonlinear loads in the distribution network, the power quality has been seriously affected, and its harm is becoming more and more serious. Seriously, it must be changed. Static var generator (STATCOM) is a compensation device based on fully controlled power electronic devices. It has the characteristics of smal...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02M5/458
CPCY02E40/30H02J3/1857H02M5/4585
Inventor 高晗璎王海瑞于美洁张仕野
Owner HARBIN UNIV OF SCI & TECH
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