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.
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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