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Method for restraining hyposynchronous resonance of power system

A subsynchronous resonance, power system technology, used in control systems, control generators, electrical components, etc., to achieve the effect of suppressing voltage fluctuations

Active Publication Date: 2009-04-08
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

[0004] Aiming at the problem of subsynchronous resonance in the thermal power transmission system and the shortcomings of existing solutions, the present invention proposes a new subsynchronous resonance suppression method, that is, using a controllable high-voltage shunt reactor to suppress the subsynchronous resonance of the power system

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  • Method for restraining hyposynchronous resonance of power system
  • Method for restraining hyposynchronous resonance of power system
  • Method for restraining hyposynchronous resonance of power system

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Embodiment Construction

[0024] The controllable high-voltage shunt reactor was originally used to solve the reactive power balance and overvoltage problems of the EHV / UHV transmission system. At present, two sets of 500kV controllable high-voltage shunt reactors have been put into operation in my country, and they are also planned to be used in 750kV and 1000kV power grids. Control high voltage shunt reactor.

[0025] The conventional controllable high-voltage shunt reactor adopts power electronic technology, and its capacity can be adjusted dynamically; the present invention proposes to solve the problem of sub-synchronous resonance by adding a sub-synchronous resonance suppression module to the controller of the controllable high-voltage shunt reactor. On the basis of adopting an appropriate control strategy, the high-voltage controllable shunt reactor can increase the electrical damping in the subsynchronous frequency range, thereby achieving the effect of suppressing subsynchronous resonance. The ...

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Abstract

The invention provides a method for using a controllable high-voltage shunt reactor to inhibit the sub-synchronous resonance of an electric power system. The shafting tachometry signal of the steam turbine generator unit in the electric power system is used as an input signal, and the shafting torsional oscillation property of the steam turbine generator unit can be discriminated from the input signal after being processed by digital signal algorithm. The method is characterized in that the shafting torsional oscillation property signal is calculated on line with a sub-synchronous resonance control strategy to gain the volume control command of the controllable high-voltage shunt reactor, so as to dynamically adjust the volume of the shunt reactor, thus correspondingly dynamically adjusting the reactive power, voltage, active power and rotating speed of the steam turbine generator unit, realizing the effect of inhibiting the sub-synchronous resonance of the steam turbine generator unit, and the effectiveness of the invention is validated by a numerical simulation aiming at certain planning system.

Description

technical field [0001] The invention proposes a method for suppressing subsynchronous resonance of an electric power system, which belongs to the safety and stability control of a power grid in electric power science, and particularly relates to a method for suppressing subsynchronous resonance of a large steam turbine unit by using a controllable high-voltage shunt reactor. Background technique [0002] In the power system, the connection of the steam turbine generator set to the system through series compensation may cause the sub-synchronous resonance (SSR) phenomenon in which the shafting of the steam turbine set interacts with the electrical system of the grid. When this electrical-mechanical resonance phenomenon is serious, it can damage the shafting of the generator in a short period of time; even if the resonance is light, it will significantly consume the mechanical life of the shaft. [0003] After the two torsional vibration failures of the generator shafting of t...

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Application Information

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IPC IPC(8): H02P9/00H02J3/24H02J3/18H02J3/01
CPCY02E40/30Y02E40/40
Inventor 项祖涛王晓刚班连庚宋瑞华丁永福范越石可琴王蒙王康平
Owner CHINA ELECTRIC POWER RES INST
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