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

A control system and control strategy technology, applied in flexible AC transmission system, reactive power adjustment/elimination/compensation, etc., can solve problems such as difficult engineering implementation, many PI adjustments, and costing debugging personnel

Inactive Publication Date: 2013-01-23
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 drawings and embodiments.

[0042] Such as figure 1 As shown, a STATCOM reactive power compensation system composed of a DC side capacitor, a three-phase inverter bridge and an inductance-capacitor (LC) filter is incorporated into the power grid public connection point PCC through a three-phase switch K through a coupling transformer T. When the three-phase switch K is closed, STATCOM is integrated into the power grid through the coupling transformer T, and 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, through active and reactive power calculation to obtain the active power and reactive power reference value, and then through the droop controller to obtain the voltage modulation signal, through the PWM generator to generate a PWM wave to control the STATCOM, so as to a...

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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 power quality of electric power systems, in particular to a synchronous compensator control system of electric power systems. Background technique [0002] After the blackout accident in North America on August 14, 2003, the safety and stability of the power system became prominent. The concept of smart grid was put forward one after another. The application of power electronic technology in the power system has attracted more and more attention, and the flexible AC transmission system (Flexible AC Transmission System-FACTS) technology provides powerful means for large-area interconnected 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) systems, can enhance the control capability of the power system and i...

Claims

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Application Information

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Patent Type & Authority Patents(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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