Direct-current power energy compensation modulation method for replying multi-direct-current simultaneous commutation failure
A DC power and commutation failure technology, applied in the direction of reactive power adjustment/elimination/compensation, reactive power compensation, power transmission AC network, etc., can solve the problems affecting the economy of the power grid, so as to improve stability and economy, Reduce the amount of cutting and control the effect of flexibility
Inactive Publication Date: 2019-04-23
STATE GRID CORP OF CHINA +3
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In the case that the first DC commutation failure is inevitable, considering that the DC power can be recovered in a short time after the commutation failure is restored,
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[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0038] 1. The steps of the present invention are described in detail as follows:
[0039] A DC power energy compensation modulation method for dealing with multiple DC simultaneous commutation failures, the analysis steps include
[0040] (1) Determination of the compensation ability of the sending end system by different DC line power boosts
[0041] Since the DC commutation failure impact has less disturbance to the stability of the AC-DC system than DC blocking or other short-circuit faults, it is not necessary to simultaneously perform power modulation on all DCs where commutation failures occur. In order to simplify the DC control process, as much as possible To prevent secondary impact on the system as much as possible, only select part of DC for control. Due to the difference in the influence of DC power drop on the stability...
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The invention relates to a direct-current power energy compensation modulation method for replying multi-direct-current simultaneous commutation failure. The direct-current power energy compensation modulation method comprises the steps of: firstly, determining the recovery capability sizes of different direct-current power boosts to the stability of a sending-end alternating-current system basedon transient energy change of the sending-end alternating-current system; then calculating out direct-current power impact energy generated by the multi-direct-current simultaneous commutation failure; determining the severity degree of the multi-direct-current simultaneous commutation failure; choosing a direct-current amount which power modulation needs to be put into and appropriate direct-current transmission lines based on the severity degree of the commutation failure and the recover capacity sizes of the different direct-current power boosts to the stability of the sending-end system; choosing an appropriate direct-current power boost amount according to different direct-current overload capacities and calculating out power boost time; performing the power modulation according to adirect-current power energy compensation principle to compensate power impact generated by the multi-direct-current simultaneous commutation failure. By means of the direct-current power energy compensation modulation method, sending-end alternating-current connecting line power fluctuation is inhibited, a sending-end generator tripping amount is reduced, even generator tripping measures are eliminated, and operation stability and economical efficiency of an alternating and direct-current hybrid system are improved.
Description
technical field [0001] The present invention relates to the technical field of stability control of AC-DC hybrid power grids in electric power systems, in particular to a method for improving the stability of a sending-end system in the case of simultaneous commutation failures of multiple DCs, based on commutation failure power impact energy (CFPIE, Commutation Failure Power Impact Energy) DC power energy compensation modulation method. Background technique [0002] my country has a vast territory and the distribution of energy is very uneven. Therefore, it is necessary to transmit a large amount of electric energy to East China through long-distance transmission lines. With the continuous growth of power demand and the unique technical and economic advantages of DC transmission, DC transmission technology is playing an increasingly important role in large-capacity long-distance power transmission and large-area grid interconnection. my country's Yangtze River Delta and Pe...
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Login to view more IPC IPC(8): H02J3/18H02J3/36
CPCH02J3/18H02J3/36Y02E40/30Y02E60/60Y04S10/52
Inventor 唐飞刘涤尘王少辉周仕豪刘福锁侯玉强
Owner STATE GRID CORP OF CHINA
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