UPQC (Unified power quality compensator) with high frequency isolation link and control method
A technology for comprehensive compensation and power quality, applied in AC network voltage adjustment, AC network to reduce harmonics/ripples, harmonic reduction devices, etc., can solve the problems of large size and high cost of compensation devices
Active Publication Date: 2014-05-21
EAST GRP CO LTD
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Problems solved by technology
[0006] The present invention provides a comprehensive power quality compensator and control method with a high-frequency isolation link, which has solved the problems of large volume and high cost of existing compensation devices
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[0038] see figure 1 Referring to Fig. 8, the present invention will be described in detail below in conjunction with the accompanying drawings.
[0039] A comprehensive power quality compensator with a high-frequency isolation link, the compensator includes: a high-frequency link AC / AC converter with a Z source for providing power compensation, and a high-frequency link AC with a Z source for driving the / A drive circuit for the AC converter, a control circuit for controlling the drive circuit, a voltage detection circuit for voltage detection, and a detection and judgment circuit for detecting the voltage and the rated voltage of the grid, the voltage detection circuit and the rated voltage of the power grid. The detection and judgment circuits are respectively connected to the control circuit, the control circuit is connected to the driving circuit, and the driving circuit is connected to the high-frequency link AC / AC converter with Z source.
[0040] In this embodiment, th...
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The invention relates to the technical field of power quality compensation, particularly to a UPQC with a high frequency isolation link and a control method. The UPQC with the high frequency isolation step comprises a high frequency link AC (Alternating Current) / AC convertor with a Z source, a driving circuit, a control circuit for controlling the driving circuit to work, a voltage detection circuit and a detection judging circuit, wherein the voltage detection circuit and the detection judging circuit are respectively connected with the control circuit, the control circuit is connected with the driving circuit, and the driving circuit is connected with the high frequency link AC / AC convertor with the Z source. By adding a Z network, a duty cycle can be controlled to achieve buck-boost and polarity reversal of a converter, a voltage compensation range is wide, the control is convenient and simple, the high frequency link AC / AC convertor with the Z source replaces a power frequency convertor, a middle energy-storage capacitor is eliminated, the volume, weight and costs of the device are reduced, and the reliability of a system is improved.
Description
technical field [0001] The invention relates to the technical field of power quality compensation, in particular to a power quality comprehensive compensator with a high-frequency isolation link and a control method. Background technique [0002] The power quality comprehensive compensator is a power supply device used to improve the power supply quality of the power grid, including the distributed power grid formed by multiple energy sources. Its main functions are: ①compensate the voltage fluctuation and harmonics of the power grid; ②compensate the reactive power and harmonic components in the load; ③isolate the harmonic interaction between the power grid and the load through isolator components such as transformers interference. [0003] At present, the most commonly used comprehensive compensator for power quality is composed of a Delta converter and a parallel active power filter connected in series. In order to adapt to the wide fluctuation range of the grid voltage,...
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IPC IPC(8): H02J3/12H02J3/01
CPCY02E40/40
Inventor 徐海波
Owner EAST GRP CO LTD