基于背靠背双PWM变流器的飞轮储能系统并网控制方法研究

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Abstract A dual-PWM (pulse width modulation) converter with a LCL filter is adopted as an energy exchange interface between flywheel motor and power system. Then a grid-connected control method for FESS is proposed. It is composed of grid-side converter control loop and motor-side converter control loop. The control process includes charge, pre-grid-connected and grid-connected stages. At charge and pre-grid-connected stages, only the six uncontrolled diodes work in the grid-side converter. While the motor-side converter adopts an outer speed loop at charge stage, and adopts an outer DC-bus voltage loop at pre-grid-connected stage. At grid-connected stage, the control of grid-side converter adopts the direct power control strategy based on a grid-side current loop cascaded with an inner converter-side current loop, and thus determines the magnitude and flow direction of grid- connected active power; the control of motor-side converter is based on an outer DC-bus voltage loop cascaded with an internal current loop, and maintains the DC-bus voltage. The parameters of motor- side current controller and DC-bus voltage controller are designed using the zero-pole offset order- reduction method and symmetric optimum function equivalency method respectively. Experiments at charge, pre-grid-connected and grid-connected stages have been conducted. Experimental results validate the feasibility of the proposed method.

Key words： Flywheel energy storage system(FESS) grid-connected control charge and discharge control dual-PWM converter LCL filter permanent magnet synchronous motor(PMSM)

Received: 10 July 2013 Published: 14 September 2015

PACS:	TK02
	TM91

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	Liu Wenjun
	Tang Xisheng
	Zhou Long
	Qi Zhiping

Cite this article:

Liu Wenjun,Tang Xisheng,Zhou Long等. Research on Grid-Connected Control Method for FESS Based on Back-to-Back Converter[J]. Transactions of China Electrotechnical Society, 2015, 30(16): 120-128.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I16/120

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