A Coordinated Control Method for Series Units of Distributed Power Flow Controllers
A technology of power flow controller and coordinated control, which is applied in the direction of AC networks with the same frequency from different sources, can solve problems such as unfavorable engineering applications, and achieve the effect of rapid control
Active Publication Date: 2020-07-17
HUAZHONG UNIV OF SCI & TECH +1
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This coordinated control method is not conducive to practical engineering applications
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[0035] In order to make the technical means, creative features and purpose of the present invention easy to understand, the present invention will be further elaborated below.
[0036] The distributed power flow controller series unit coordinated control method provided in this embodiment is applied to the DPFC coordinated control system, and the DPFC equivalent circuit model used is shown in figure 1 : The parallel device adopts the third harmonic current source equivalent, and the series device (composed of multiple series units with the same topology and control parameters) adopts a detailed power electronic model. The topology diagram of the DPFC series unit is shown in figure 2 : DPFC series unit includes 1 single-turn transformer, 2 bypass switches K 1 , 3 current transformers, 4 single-phase converters, 5 series unit controllers and 6 carrier communication receiving modules. The DPFC series device is composed of multiple series units with the same topology and contro...
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A method for coordinate control of series unit of a distributed power flow controller is provided in the invention. A DPFC series unit coordinated control system comprise a coordinated controller, A plurality of serial unit controllers and a PLC unidirectional communication link, this method calculates the reference phasor of the fundamental frequency compensation voltage of the series unit in thecoordination controller, and the phase difference between the fundamental frequency current of the transmission line and the terminal voltage corresponding to the initial steady state is obtained byusing the WAMS system and the waveform of the fundamental frequency current of the transmission line collected on the spot by the series unit generates the waveform of the terminal voltage in the series unit, Furthermore, the waveform of the reference phasor of the fundamental frequency compensation voltage of the series unit is generated, and the actual output phasor of the fundamental frequencycompensation voltage of the series unit is controlled to approximate the reference waveform of the fundamental frequency compensation voltage of the series unit, so that the accurate and fast controlof the DPFC series unit can be realized without the high-speed communication link.
Description
technical field [0001] The invention relates to a coordinated control method of series units of a distributed power flow controller, which is applied to the flexible AC power flow control of a transmission network. Background technique [0002] Distributed power flow controller (DPFC) can flexibly and effectively regulate the power flow of transmission lines, and has broad application prospects. Although scholars at home and abroad have conducted extensive research on the coordinated control of DPFC, for the fundamental frequency voltage control output by DPFC series units, the existing technology uses the voltage at the head end or end of the transmission line as the reference phase, and needs to pass The high-speed communication link directly sends the reference voltage waveform to the controller of each series unit, so that the series unit can output an appropriate fundamental frequency voltage. This coordinated control method is not conducive to practical engineering ap...
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IPC IPC(8): H02J3/06
CPCH02J3/06
Inventor 肖萌萌王少荣郑超黄涌徐秋实赵红生马嘉唐爱红刘涤尘
Owner HUAZHONG UNIV OF SCI & TECH