Method and device for judging stability of voltage source converter station connected to multi-infeed system
A voltage source type, converter station technology, applied in the direction of power transmission AC network, AC network voltage adjustment, reactive power compensation, etc., can solve the problem that it is difficult to take into account the influence of the voltage stability of the converter bus, and it is difficult to accurately evaluate the hybrid double-fed Incoming system static voltage stability and other issues
Active Publication Date: 2021-05-04
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology
[0006] It can be seen from the above formula that ESCR can only quantitatively reflect the reactive power provided by the condenser, and it is difficult to take into account the influence of the excitation control of the condenser on the stability of the commutation bus voltage
Make it difficult for ESCR to accurately evaluate the static voltage stability of hybrid double-infeed systems
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[0066] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
[0067] Such as figure 1 As shown, this embodiment provides a method for judging the stability of a voltage source converter station connected to a multi-infeed system, and the specific steps are as follows:
[0068] Input the hybrid generalized short-circuit ratio HGSCR model according to the power flow information in the power system;
[0069] Compare the output value of the HGSCR model with the value 1;
[0070] If the value is greater than 1, the power system is in a stable state;
[0071] If the value is equal to 1, the power system is in a critical stable state;
[0072] If t...
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The invention relates to a method and device for judging the stability of a voltage source converter station connected to a multi-infeed system. The specific steps of the judging method are as follows: input the hybrid generalized short-circuit ratio HGSCR model according to the power flow information in the power system; The output value of the output value is compared with the value 1; if the value is greater than 1, the power system is in a stable state; if the value is equal to 1, the power system is in a critical stable state; if the value is less than 1, the power system is out of stability. Compared with the prior art, the present invention can accurately judge the static voltage stability of the hybrid double-feed system.
Description
technical field [0001] The invention relates to on-line monitoring and control of a power system, in particular to a method and device for judging the stability of a voltage source converter station connected to a multi-infeed system. Background technique [0002] Line-commutated converter based high voltage direct current (LCC-HVDC) plays an important role in long-distance power transmission because of its low loss and large capacity. Due to the existence of trigger delay angle and arc extinguishing angle, LCC-HVDC needs to absorb a large amount of reactive power during the commutation process, and this part of reactive power accounts for about 40% to 60% of the DC transmission capacity. If the reactive power compensation is insufficient, it will cause harm to the system voltage stability. Due to the decoupling control of active and reactive power based on voltage source converter based high voltage direct current (VSC-HVDC), no commutation failure problem, and flexible co...
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IPC IPC(8): H02J3/16H02J3/36
CPCH02J3/16H02J3/36H02J2203/20Y02E40/30Y02E60/60
Inventor 李东东孙梦显赵耀高晓城边晓燕杨帆林顺富
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER