Abstract
A bidirectional three-level soft switching circuit topology is proposed and implemented for medium voltage applications such as 750 V dc light rail transit, high power converters, or dc microgrid systems. The studied converter is constructed with a three-level diode-clamp circuit topology with the advantage of low voltage rating on the high-voltage side and a full-bridge circuit topology with the advantage of a low current rating on the low-voltage side. Under the forward power flow operation, the three-level converter is operated to regulate load voltage. Under the reverse power flow operation, the full-bridge circuit is operated to control high-side voltage. The proposed LLC resonant circuit is adopted to achieve bidirectional power operation and zero-voltage switching (ZVS). The achievability of the studied bidirectional ZVS converter is established from the experiments.
Highlights
Renewable power to reduce the effect of global warming has been developed by using high efficiency power electronic based converters in local dc nanogrid or microgrid distribution [1,2,3,4,5,6]
In order to maintain the voltage stability on dc distribution system, energy storage power units are usually demanded between battery banks and dc bus system to save excess energy on the dc bus
High frequency link medium voltage converters have been used for dc traction power units, three phase industry power supplies and dc microgrids
Summary
Renewable power to reduce the effect of global warming has been developed by using high efficiency power electronic based converters in local dc nanogrid or microgrid distribution [1,2,3,4,5,6]. PWM scheme is widely adopted in bidirectional DAB systems to control power flow and realize soft switching turn-on characteristics. Bidirectional Full-bridge resonant converters presented in [16,17,18] have symmetric circuit structure to achieve forward and backward power flow so that power switches can realize zero-voltage switching. The same the diode-clamp using the pulse-frequency to resonant circuit voltage structures bidirectional flow,converter an additional is connected on the control low-side andfor active devices of power full-bridge on theinductor secondary-side are operated primary-side the In reverse flow condition. The circuit power flow capability can be applied in local dc nanogrid or microgrid distribution between renewable characteristic a 1.44 laboratory circuit demonstrated and discussed to energy power and experiments local dc or acwith loads.
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