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Control method of AC/DC two-way power converter used for AC/DC hybrid micro-grid

A technology of AC-DC hybrid and control method, which is applied in the field of AC/DC bidirectional power converter control for AC-DC hybrid microgrid, can solve the problems of serious harmonics, large loss, high system cost, etc., and achieve improved voltage stability and power The effect of smooth quality and power output

Inactive Publication Date: 2014-04-16
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Considering the large number of DC distributed power sources and the increasing DC load that may exist in the microgrid, the currently widely used single AC power supply method has problems such as high system cost, large loss, and serious harmonics.

Method used

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  • Control method of AC/DC two-way power converter used for AC/DC hybrid micro-grid
  • Control method of AC/DC two-way power converter used for AC/DC hybrid micro-grid
  • Control method of AC/DC two-way power converter used for AC/DC hybrid micro-grid

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0029] figure 1 It is the topological structure diagram of AC / DC bidirectional power converter. Where L is the AC side filter inductance, C is the AC side filter capacitor, u i and i i is the output voltage and current of the AC side, u dc and i dc is the DC side voltage and current, e i and i Li are the capacitor voltage on the AC side (i.e. the AC bus voltage) and the inductance current...

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Abstract

The invention discloses a control method of an AC / DC two-way power converter used for an AC / DC hybrid micro-grid, and belongs to the technical field of electronic pulse width modulation of electric power. The control method particularly comprises the steps that when the AC / DC hybrid micro-grid operates in a networking mode, constant voltage is adopted to control a DC micro power source, constant power is adopted to control an AC micro power source, and therefore the two-way power converter transmits rated power to the micro-grid; when the AC / DC hybrid micro-grid operates in an islanding mode, constant voltage and constant frequency are adopted to control the AC micro power source, constant voltage is adopted to control the DC micro power source, and therefore active power between AC / DC micro-grids is balanced. On the basis of voltage control, the control item of the active power is introduced, the power flow between the AC / DC micro-grids is effectively balanced, and the stability and controllability of system networking operation and islanding operation are improved.

Description

technical field [0001] The invention relates to the technical field of power electronic pulse width modulation, in particular to an AC / DC bidirectional power converter control method for an AC / DC hybrid microgrid. Background technique [0002] Microgrids can be divided into AC and DC, and currently exist mainly in the form of AC. Considering the possible existence of a large number of DC distributed power sources and the increasing DC load in the microgrid, the currently widely used single AC power supply method has problems such as high system cost, large loss, and serious harmonics. So far, there are many control methods for AC / DC bidirectional power converters, such as the non-dead zone three-phase AC / DC converter with high-frequency rectifier bridge proposed in patent CN201210113941.7; Two-phase step-down AC / DC converter; CN201210557230.9 introduces a multifunctional current-mode bidirectional AC / DC converter and its control method, etc. However, the control methods fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797H02J5/00
CPCY02P80/14
Inventor 徐伟唐磊曲荣海
Owner HUAZHONG UNIV OF SCI & TECH
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