A method to suppress the frequency of hydropower islanding considering the water pressure pulsation in the draft tube
A water pressure pulsation, draft tube technology, applied in the direction of electrical components, circuit devices, electrical digital data processing, etc., can solve the problems of a single, simple island frequency suppression method, and achieve the effect of a wide range of applications
Inactive Publication Date: 2016-02-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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[0006] The purpose of the present invention is to provide a hydropower islanding frequency suppression method considering the water pressure fluctuation of the draft tube, which is used to solve the problems that the traditional draft tube water pressure fluctuation modeling is too simple and the islanding frequency suppression method is too simple
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[0065] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.
[0066] figure 1 It is a schematic diagram of the hydropower island HVDC sending end system model. This embodiment takes figure 1 The simulation system shown in the power system model on the simulation software pscad is taken as an example to illustrate the frequency suppression effect of the present invention in the island operation mode of the hydroelectric unit at the sending end of HVDC.
[0067] The DC main circuit model in the simulation system is ±500kV, unipolar 12 pulses, DC transmission power 1000MV, and the basic model of the control system adopts the controller of the CIGRE DC transmission standard test system; since the strength of the AC receiving end system is much greater than that of the island sendin...
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The invention discloses a hydropower island frequency inhibition method considering a hydraulic-pressure pulsation condition of a draft tube in the technical field of electric-power system operation and control. The method includes: according to a coupling mathematic model of a hydraulic system and an electric-power system, an inherent oscillation frequency of a hydropower island DC sending-end system is calculated; a water-turbine model is improved and then a detailed water-turbine model considering the hydraulic-pressure pulsation of the draft tube is obtained; making a characteristic frequency and a pressure pulsation frequency of the draft tube in a resonance function of the detailed water-turbine model equal to the inherent oscillation frequency of the system and hydropower island DC sending-end system oscillation frequency data caused by the hydraulic-pressure pulsation of the draft tube are acquired; and the hydropower island DC sending-end system oscillation frequency data caused by the hydraulic-pressure pulsation of the draft tube are inhibited and the inhibited hydropower island DC sending-end system oscillation frequency data are obtained. The detailed water-turbine model and a frequency limiter, which are designed in the invention, are capable of inhibiting and considering the practical island DC sending-end frequency oscillation caused by the hydraulic-pressure pulsation of the draft tube so that application scope is wide.
Description
technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to a hydropower island frequency suppression method considering the water pressure fluctuation of draft tubes. Background technique [0002] Along with the advancement of the west-to-east power transmission strategy, a large number of hydropower bases are being built or will soon be built in Southwest my country. This type of new hydropower station has a large installed capacity, and the power receiving end is generally located in the eastern coastal cities. The power transmission distance provided by the hydropower station is relatively long. Compared with traditional AC transmission, HVDC transmission has the advantages of flexible transmission, low loss, and fast control. Therefore, many hydropower stations use HVDC transmission to increase the power sent out. For example, Xiangjiaba-Shanghai, Yunnan-Guangdong, and the Xiluodu-Zhexi ±800Kv D...
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IPC IPC(8): H02J3/36H02J1/00G06F17/50
CPCY02E60/60
Inventor 刘崇茹张梦琳张健韩玉蓉王建明魏佛送王歆李庚银
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)