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A thyristor controlled series capacitor suitable for damping sub-synchronous resonance

A technology of thyristor control and series capacitors, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc.

Active Publication Date: 2009-06-03
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not possible to obtain guaranteed calculated values ​​during the design phase
Therefore, the potential risks of SSRs must be estimated based on assumed mechanical damping values ​​obtained from previous experience

Method used

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  • A thyristor controlled series capacitor suitable for damping sub-synchronous resonance
  • A thyristor controlled series capacitor suitable for damping sub-synchronous resonance
  • A thyristor controlled series capacitor suitable for damping sub-synchronous resonance

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Embodiment Construction

[0036] figure 1 The mechanical system 1 connected to the electrical system 2 is illustrated. The mechanical system includes a turbine 3 and a rotor part 4 of a generator 5 connected to the turbine by a shaft 6. The electrical system includes a stator part 7 of the generator and a network 8 connected to the generator. The mechanical shaft system is characterized by a small signal transmission function ("turbine and shaft system") from deviation of applied torque to deviation of shaft speed. The electrical system can be represented by the box "Generator & el transm system", which has a transmission function from the applied speed deviation to the electrical torque deviation. These two transfer functions are connected in cascade. The stability of the feedback system is determined by the characteristics of the electrical system.

[0037] When frequency f mech When modulating the shaft speed of the generator, its phase relative to the rest of the electrical network will change with t...

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Abstract

A device (17) controlling a thyristor controlled series capacitor suitable connected to a power transmission line (12), comprising a thyristor starting controller (18) including a device corresponding to a command signal and used to realize a respected voltage zero crossing of a capacitor by means of line current and capacitor voltage; and a command controller (19) used to provide a command signal to the thyristor starting controller. The command controller comprises a damping controller (24) including a device used to provide damping at the place of at least a discrete frequency.

Description

Technical field [0001] The present invention relates to the control of oscillation of an electric power system. The present invention particularly relates to such control using thyristor controlled series connected capacitors (TCSC). Electrical power systems include cooperative electrical circuits and mechanical circuits. The mechanical circuit includes a generator and a turbine connected to each other by a shaft. In particular, the present invention relates to the damping of subsynchronous resonance (SSR) in such power systems. Background technique [0002] As a result of the weak damping of the interconnection, particularly during strong power transmission, oscillations of active power in the power transmission system may occur in the corridor between the power generation area and the load area. This oscillation is triggered by some reasons such as line failure or sudden changes in generator output or load. [0003] The control provided by TCSC is "impedance" type control. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/18
CPCH02J3/1807Y02E40/14Y02E40/10
Inventor 贡纳尔·阿斯普隆德周长春刘前进
Owner HITACHI ENERGY SWITZERLAND AG
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