Micro electrical network common bus voltage imbalance inhibition method

A technology of unbalanced voltage and common bus, applied in the direction of reducing asymmetry of multi-phase network, eliminating/reducing asymmetry of multi-phase network, etc., can solve problems such as accidents, low utilization rate of equipment, exceeding the output limit of power quality conditioner, etc. , to achieve the effect of enhancing control ability, improving voltage quality, and realizing economical and stable operation

Inactive Publication Date: 2014-04-09
TIANJIN UNIV
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Problems solved by technology

The former is rarely used due to high cost and influence on line parameters, while the latter, when the line is seriously unbalanced, the negative sequence current input to the system will increase rapidly, and in severe cases, it will exceed the output limit of the power

Method used

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  • Micro electrical network common bus voltage imbalance inhibition method
  • Micro electrical network common bus voltage imbalance inhibition method
  • Micro electrical network common bus voltage imbalance inhibition method

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Embodiment Construction

[0029] The present invention will be described below in conjunction with the accompanying drawings and embodiments.

[0030] An embodiment of the present invention, a multi-distributed power supply parallel system includes several parallel distributed power sources connected to the same microgrid bus through PCC, and the bus voltage is 400V, such as figure 1 shown. Distributed power supply includes DC micro-source, three-phase full-bridge inverter, LC filter circuit and control system. like figure 2 As shown, the control strategy of each DG includes positive sequence active power / frequency and reactive power / voltage droop control, virtual impedance control and voltage unbalance suppression control. Positive sequence active power / frequency and reactive power / voltage droop control ensures the output voltage level and power level of each distributed power supply; virtual impedance control ensures positive sequence active power / frequency and reactive power / voltage droop by addi...

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Abstract

The invention belongs to the distributed power source control technology field in a micro electrical network system and relates to a micro electrical network common bus voltage imbalance inhibition method. According to the method, direct compensation for bus negative phase-sequence voltage at a PPC node in the micro electrical network system is carried out, each distributed power source in the micro electrical network can automatically respond to bus voltage imbalance degree at the PPC node in the micro electrical network system, adaptive adjustment of a negative phase-sequence voltage compensation controller (UVC) is carried out, so each distributed power source carries out negative phase-sequence wattless output according to the rated negative phase-sequence wattless capacity to maintain the voltage balance degree of the bus at the PCC node. Through the method, the parallel distributed power sources in the micro electrical network are enabled to have a function of imbalance voltage inhibition in the micro electrical network.

Description

technical field [0001] The invention belongs to the technical field of distributed power supply control in a microgrid system, and relates to a common bus voltage imbalance suppression method based on the parallel connection of multiple distributed power supplies. Background technique [0002] The widespread use of new energy power generation systems has made the microgrid system based on a variety of distributed power sources, loads and energy storage devices the basic unit of the smart grid. The microgrid system is generally a low-voltage system, and single-phase loads are widely present in the low-voltage system, which leads to the asymmetry of the three-phase output voltage of the three-phase inverter, which causes a large energy loss and affects the stability of the microgrid system. . Therefore, measures must be taken to suppress it to ensure that the distributed power supply maintains a relatively balanced output voltage under unbalanced loads. [0003] Both IEEE an...

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Application Information

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IPC IPC(8): H02J3/26
CPCY02E40/50
Inventor 李永丽张玮亚孙广宇靳伟李小叶
Owner TIANJIN UNIV
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