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Control method of microgrid bidirectional converter based on virtual synchronous machine and stability analysis thereof

A bidirectional converter and virtual synchronous machine technology, applied in the direction of single-network parallel feeding arrangement, reducing/preventing power oscillation, etc., can solve problems such as frequency deviation and differential adjustment

Active Publication Date: 2019-09-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Application Information

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Problems solved by technology

However, there is a frequency deviation in the traditional virtual synchronous machine control, which is a differential adjustment

Method used

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  • Control method of microgrid bidirectional converter based on virtual synchronous machine and stability analysis thereof
  • Control method of microgrid bidirectional converter based on virtual synchronous machine and stability analysis thereof
  • Control method of microgrid bidirectional converter based on virtual synchronous machine and stability analysis thereof

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[0124] The control method of the AC-DC hybrid micro-grid bidirectional converter based on the virtual synchronous machine of the present invention is applied in the AC-DC hybrid micro-grid, relying on the micro-grid bidirectional converter to realize the non-deviation control of the AC frequency and the stable control of the DC bus voltage . Under normal circumstances, the AC-DC hybrid microgrid operates stably, and the transmission power of the bidirectional converter of the microgrid is zero. When the load on the AC side suddenly increases, the frequency drops, and the control system detects a frequency deviation. After calculation, a virtual mechanical active power signal is generated, which is sent to the inertial damping link, and the frequency is adjusted without deviation through the feedback compensation of the integral link. When a sudden load increase occurs on the DC side, the DC bus voltage drops, and the system switches the control mode to generate a virtual mecha...

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Abstract

The invention relates to a control method of a microgrid bidirectional converter based on a virtual synchronous machine and stability analysis thereof. An integrator is added in a damping link of a rotor motion equation, and an angular frequency deviation value is fed back and compensated, so that the error-free control of alternating current subnet frequency in a microgrid off-grid mode is achieved. In consideration of the bidirectional transmission characteristic of the converter, a control target is switched into a direct-current voltage from an alternating-current frequency in real time bychanging a virtual mechanical active power reference value given mode, and stable control of direct-current bus voltage is achieved. By establishing a power inner ring and a voltage / frequency outer ring small signal model, transfer functions of the converter in a frequency control mode and a direct current voltage control mode are respectively solved, and stability analysis is performed. The control method of the microgrid bidirectional converter based on a virtual synchronous machine and the stability analysis thereof can well achieve the frequency error-free adjustment of the frequency andthe stable control of the direct current voltage under the off-grid mode.

Description

technical field [0001] The invention relates to an AC-DC hybrid micro-grid bidirectional converter. In particular, it relates to a control method and stability analysis of a microgrid bidirectional converter based on a virtual synchronous machine. Background technique [0002] With the increasingly serious environmental and energy problems in today's world, various distributed power sources (photovoltaic, wind power, etc.) have received great attention from relevant scholars. The microgrid was first proposed by the American scholar Professor R.H.Lasseter, which can provide an effective way for distributed access to the distribution network. With the increase in the types and quantities of distributed power sources, the popularity of DC loads, and the complexity and variety of distribution network structures, it is difficult for AC microgrids to fully meet the growing power supply needs. In order to ensure the efficient use of new energy and renewable energy, and better mee...

Claims

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Application Information

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IPC IPC(8): H02J3/48H02J3/24
CPCH02J3/48H02J3/24Y02P80/14
Inventor 李鹏马显周益斌郭天宇王子轩
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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