Excitation control method for suppressing commutation failure of generator

A technology for excitation control and commutation failure, applied in circuit devices, AC network circuits, reducing/preventing power oscillation, etc., can solve problems such as high cost of dynamic reactive power compensation devices, and achieve enhanced ability to resist commutation failure, regulation The effect of improving ability and improving stability

Active Publication Date: 2020-10-16
JIANGSU ELECTRIC POWER CO +1
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The cost of dynamic reactive power compensation device is high, and there are a large number of generators in the receiving end power grid. As the main reactive power source of the power system, it is necessary to fully tap the reactive power potential of the generators in the receiving end power grid to exert its temporary power after a fault. Dynamic reactive power support capability, reducing additional dynamic reactive power configuration costs

Method used

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  • Excitation control method for suppressing commutation failure of generator

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Embodiment Construction

[0019] Such as figure 1 As shown, it is the excitation control strategy model diagram of the regional generator based on voltage sensitivity to suppress commutation failure in the present invention, where U ref is the control target of machine terminal voltage; U is the actual value of machine terminal voltage; K p 、K i 、K d is the voltage closed-loop PID control parameter; E fd is the output excitation voltage; K pH 、K iH is the PID control parameter of the bus voltage control loop of the converter station; U Href is the given value for the bus voltage control of the converter station; U H is the actual value of the bus voltage of the converter station, EN is the enable signal of the bus voltage control loop of the converter station, when its value is 1, it outputs the output of the bus voltage control loop of the converter station, and when it is 0, it outputs the control output of the normal machine terminal voltage closed loop ; Hset It is the setting value of stro...

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Abstract

The invention discloses an excitation control method for suppressing commutation failure of a generator. A generator set related to the bus voltage intensity of a converter station is determined through voltage sensitivity analysis; a converter station bus voltage control loop is added in excitation control of the generators. A target converter station bus voltage is introduced to serve as a control target and a starting signal, after starting, excitation voltage is switched from output of a normal voltage closed loop to output of the converter station bus voltage control loop, and after the converter station bus voltage control loop acts for set time, output of an excitation system is switched to output of the normal voltage closed loop again. In the existing power grid structure, the power grid voltage stability is improved by utilizing the overload capacity of the generator and the flexible quick generator end voltage regulation capacity, the commutation failure resistance of the direct current system is enhanced, existing resources in the power grid are fully mined under the condition of not increasing new investment and equipment, and the stability of the alternating current and direct current power grid is improved.

Description

technical field [0001] The invention relates to an excitation control method in the field of power system control, in particular to an excitation control method for suppressing commutation failure of a generator. Background technique [0002] In view of the power angle, frequency, and voltage stability problems caused by high-voltage direct current (HVDC) blockage, the current DC supporting safety control system mainly adopts the control measures of removing the unit from the power grid at the sending end, removing the load from the power grid at the receiving end or pumping the storage pump, and modulating the DC active power. Its main control idea is to quickly balance the active power of the grid on the spot, and the control sequence is an emergency control at the ms level, which belongs to the category of the second line of defense. In recent years, due to the restrictions on the risk of accidents caused by the loss of power grid load, the power grid dispatching departme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/50H02J3/24
CPCH02J3/50H02J3/24H02J2203/20
Inventor 汪惟源窦飞程锦闽王震泉乐晓蓉
Owner JIANGSU ELECTRIC POWER CO
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