STATCOM (static synchronous compensator) control system adopting droop control strategy and control method thereof

A technology of control system and control strategy, applied in flexible AC transmission system, reactive power adjustment/elimination/compensation and other directions, which can solve the problems of difficult engineering implementation, excessive PI adjustment, and cost of debugging personnel.

Inactive Publication Date: 2011-10-19
HUNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the idea of ​​this control scheme is simple and clear, there are too many PI adjustments and the system debugging is too complicated, which often takes a lot of time for debugging personnel and is difficult to implement.

Method used

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  • STATCOM (static synchronous compensator) control system adopting droop control strategy and control method thereof
  • STATCOM (static synchronous compensator) control system adopting droop control strategy and control method thereof
  • STATCOM (static synchronous compensator) control system adopting droop control strategy and control method thereof

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0042] like figure 1 As shown, the STATCOM reactive power compensation system composed of DC side capacitors, three-phase inverter bridge and inductor-capacitor (LC) filter is connected to the grid common connection point PCC through the three-phase switch K and the coupling transformer T. When the three-phase switch K is closed and the STATCOM is connected to the grid through the coupling transformer T, the controller collects the three-phase voltage Vabc, the three-phase current Iabc, the real-time frequency ω of the grid voltage and the DC side capacitor voltage U dc Signal, the reference value of active power and reactive power is obtained through the calculation of active and reactive power, and then the voltage modulation signal is obtained through the droop controller, and the PWM wave is generated by the PWM generator to control STATCOM, so as to ...

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Abstract

The invention discloses a STATCOM (static synchronous compensator) control system adopting a droop control strategy and a control method thereof. The STATCOM control system adopting the droop control strategy comprises a direct-current side capacitor, a three-phase inverter bridge and an inductance-capacitance filter, wherein the direct-current side capacitor and the three-phase inverter bridge are connected in parallel and then connected with the inductance-capacitance filter, and the inductance-capacitance filter is connected to a PCC (Point of Common Coupling) of a power grid by a three-phase switch K through a coupling transformer T. The control method disclosed by the invention comprises the steps of real-time signal collection, computation of active power reference value P*, computation of reactive power reference value Q*, computation of frequency reference value omega* and voltage modulation amplitude reference value E*, computation of phase reference value Delta* and computation of voltage modulation signals; and only one PI (proportional integral) regulator and two droop control coefficients need to be regulated, thus the whole control method is easy to realize, and further the power system can better supply power to users safely, excellently and economically.

Description

technical field [0001] The invention relates to the field of electric energy quality of a power system, in particular to a control system for a synchronous compensator of a power system. Background technique [0002] After the North American blackout on August 14, 2003, the safety and stability of the power system became prominent. The concept of smart grid was proposed one after another. The application of power electronics technology in the power system has attracted more and more attention. AC Transmission System——FACTS) technology provides a powerful means for large-area interconnection systems to increase transmission capacity, adjust power flow distribution, enhance system damping, and improve power quality. Static Synchronous Compensator (STATCOM), as a new important component in "Flexible AC Transmission System" and "Custom Power" (Custom Power) system, can enhance the control ability of the power system and improve the power transmission of the original power system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCY02E40/10
Inventor 荣飞周贤正谢三军罗安
Owner HUNAN UNIV
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