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Transcript
•
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 2ω component and
theoretically can eliminate 2ω ripples in the dc capacitor completely. Therefore, no
electrolytic capacitors would be needed.
10.2 Future Work
•
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.
•
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.
•
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