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TCSC emergency control method for improving transient stability of power system

A technology of transient stability and emergency control, applied in flexible AC transmission systems, electrical components, circuit devices, etc., can solve problems such as poor accuracy and timeliness, and achieve improved stability, improved stability margin, and fast calming power. Effects of angle and power oscillations

Active Publication Date: 2017-06-13
NARI TECH CO LTD +2
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Problems solved by technology

[0005] Purpose of the invention: In order to improve the transient stability of the power system under disturbance and overcome the shortcomings of poor accuracy and timeliness of the traditional security and stability emergency control measures, the present invention provides a TCSC emergency control for improving the transient stability of the power system method to achieve flexible and economical increase of line transmission capacity, damping system oscillation, and effectively improving the stability of power system operation

Method used

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  • TCSC emergency control method for improving transient stability of power system
  • TCSC emergency control method for improving transient stability of power system
  • TCSC emergency control method for improving transient stability of power system

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Embodiment 1

[0077] Such as Figure 5 In the power system shown, G1~G8 are synchronous generators, G1~G6 have an active power of 280MW each, G9~G11 are wind turbines, and each fan has an active output of 280MW; busbar 5 and busbar 6 are directly connected through DC transmission; TCSC module Installed on the second circuit between busbar 1 and busbar 2, the reactance per unit value of this section of line is 0.0475, according to engineering experience, the fixed series compensation is set to 20% of the reactance value of this section of the line, and the maximum series compensation upper limit is 60% ; At 0s, a three-phase short-circuit fault occurs in the first circuit between bus 1 and bus 2 close to bus 2, and the fault is eliminated by disconnecting the line at 0.1s;

[0078] For the above fault, refer to Figure 6 , according to step S2 of the aforementioned method, the generator components can be divided into critical groups G1-G6 and remaining groups G7, G8, and further carry out s...

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Abstract

The invention discloses a TCSC emergency control method for improving the transient stability of a power system. The method comprises the steps of firstly judging whether TCSC emergency control is started or not; if so, sending out a forced compensation command to a TCSC by security control after clearing a fault, or else, completing the method; calculating a rotor angle, an angle velocity, an inertia time constant, electromagnetic power and mechanical power of an equivalent machine; calculating currently accumulated acceleration energy and deceleration energy of the equivalent machine; determining a TCSC emergency control strategy according to the currently accumulated acceleration energy and deceleration energy of the equivalent machine; and judging whether to exit from the TCSC emergency control strategy or not, if so, restoring an original TCSC control strategy, and or else, returning to TCSC emergency control in the next oscillating period. According to the TCSC emergency control method for improving the transient stability of the power system, the stability margin of a first swing in the transient process can be effectively improved, damping control of subsequent oscillation can be achieved, and power angle and power oscillation can be quickly calmed down.

Description

technical field [0001] The invention belongs to the technical field of power system automation, and in particular relates to a TCSC emergency control method for improving the transient stability of a power system. Background technique [0002] In recent years, with the access of large-scale new energy, the commissioning of UHV AC-DC transmission projects and the rapid development of power electronics technology, my country's power grid has gradually formed the world's largest power grid with the highest transmission voltage level and the highest degree of complexity. The nonlinear and non-autonomous nature of the power system is increasing, and the traditional security and stability measures can no longer fully meet the development and security of the modern power grid. Therefore, the power grid needs more secure, reasonable and intelligent operation control methods. Thyristor Controlled Series Compensation (TCSC, Thyristor Controlled Series Compensation), a power electronic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/24
CPCH02J3/00H02J3/001H02J3/002H02J3/24H02J2203/20Y02E40/10
Inventor 薛峰周野眭仁杰吴峰宋晓芳罗凯明金涛
Owner NARI TECH CO LTD
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