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Transcript

â¢ A new solid state variable capacitor (SSVC) with minimum dc capacitance is proposed. The proposed SSVC consists of an H-bridge and an additional phase leg connected to an ac capacitor with fixed capacitance, Cac and can reduce the dc capacitance to the minimum just for absorbing switching ripples. The fixed ac capacitor controlled by the additional phase leg absorbs the 2Ï component and theoretically can eliminate 2Ï ripples in the dc capacitor completely. Therefore, no electrolytic capacitors would be needed. 10.2 Future Work â¢ Although this dissertation has basically covered all the topologies and operation methods that exists in the HEV system nowadays, all the analysis are assumed to be ideal, for example, the motor currents. However, in the real system, the situation would not be even closed to ideal at all times. Any oscillation or saturation happened would push the circuit condition into a non-ideal case, which needs to be researched more in details. â¢ The proposed theory and PWM methods are all based on open loop control, which is the very first step of minimizing the dc link capacitance. The next step would be, on this basis by knowing the minimum value under open loop, further minimizing the dc capacitance would be realized by utilizing close-loop control. â¢ 3rd harmonic injection method for the multilevel H-bridge inverter needs experimental confirmation to approve the effectiveness. Additionally, this method is limited to unity power factor applications, such as the photovoltaic application proposed in the dissertation. However, many other applications with non-unity power 160