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A control method of static var compensator under asymmetric fault of power grid

A static var compensation and asymmetrical fault technology, applied in reactive power adjustment/elimination/compensation, flexible AC transmission system, etc., can solve overcurrent, blocking, improper control of series single-phase bridge static var compensator and other problems, to achieve excellent performance, prevent overcurrent, and clear physical meaning

Active Publication Date: 2016-05-04
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology

[0005] The purpose of the invention is to solve the problem of overcurrent and blocking caused by improper control of series single-phase bridge static var compensator when an asymmetrical fault occurs in the power grid

Method used

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  • A control method of static var compensator under asymmetric fault of power grid
  • A control method of static var compensator under asymmetric fault of power grid
  • A control method of static var compensator under asymmetric fault of power grid

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Embodiment Construction

[0033] The control method of the static var compensator proposed by the present invention under the asymmetrical fault of the power grid is described in detail as follows in conjunction with the accompanying drawings and embodiments:

[0034] The control method of the present invention is characterized by taking into account the control requirements of the power system for dynamic stability and voltage stability, and realizing coordinated control of voltage and damping. It is characterized in that it includes: for a series single-phase bridge static var compensator, When an asymmetrical fault occurs, the three-phase voltage at the point where the static var compensator is connected to the grid is asymmetrical. The reactive current output by each phase of the control static var compensator is proportional to the grid voltage of the phase, so as to ensure the voltage balance of the three-phase DC capacitors of the single-phase bridge static var compensator in series, and there is...

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Abstract

The invention relates to a method for controlling a static var compensator under the power grid asymmetrical fault condition, and belongs to the technical field of power grid stable control of power systems. According to the method, the ring current generation condition of three phases in the series single-phase bridge type static bar compensator under the condition that power grid connected point voltages are asymmetrical and the influencing characteristic of the ring current on direct current capacitance voltages are taken into consideration, a method that var reference currents are set according to the ratio of phase power grid voltages is adopted, three-phase capacitance voltage unbalance and overcurrent of the static var compensator under the power grid asymmetrical fault condition are avoided, and it is guaranteed that a device is continuously and stably operated. The method is clear in physical significance, easy to implement, and excellent in performance. The related method for controlling the static var compensator under the power grid asymmetrical fault condition is applied to the large power grid dynamic var compensation equipment control process, the safe operation range of the static var compensator can be increased, and stability of power grid transient voltages is improved.

Description

technical field [0001] The invention belongs to the technical field of grid stability control of electric power systems, and in particular relates to a device current control method of a static var compensator under an asymmetric fault of the grid. Background technique [0002] The static var compensator (STATCOM) with turn-off devices (IGBT, IGCT) as switching devices is a typical application of modern power electronics technology in power systems, which can help the grid to achieve dynamic reactive power continuous regulation and improve grid voltage stability. , Suppressing the low-frequency power oscillation of the line is one of the main means to realize the controllability and intelligence of the power grid. The circuit structure of series single-phase bridge static var compensator is as follows: figure 1 As shown, each phase is composed of several single-phase full-bridge inverters connected in series, and the three phases can be connected in delta or star as require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18
CPCY02E40/10
Inventor 杨银国林建熙易杨谭伟袁志昌李力吴国炳辛拓陈睿段秦刚
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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