双向全桥DC-DC（DAB）变换器在直流微电网作为可再生能源与储能设备的能量传输环节,通过实现零电压开关（ZVS）和最小回流功率,可显著地提升DAB变换器的性能,从而提高直流微电网的稳定性。但同时实现ZVS和最小回流功率控制在理论上是相互制约的。针对这一问题,该文提出一种基于ZVS的最小回流功率双重移相分段控制策略。通过对双重移相下的传输功率进行分段,前段将ZVS作为约束条件,得到基于ZVS条件下的最小回流功率控制策略,后段通过KKT条件法实现在给定传输功率下的最小回流功率控制策略。通过将所提控制策略和传统的双重移相控制对比分析,发现所提控制策略具有更小的回流功率和电流应力,提高了变换器的性能。最后,基于所提控制策略搭建实验样机,验证了控制策略的正确性和有效性。
Abstract
Bidirectional full-bridge DC-DC（dual active bridge DC-DC converter,DAB） converter, as the energy transmission link of renewable power supply and energy storage equipment, can significantly improve the performance of DAB converter by realizing zero-voltage switching（zero-voltage switch,ZVS） and minimum backflow power, so as to improve the stability of DC microgrid. However, the simultaneous realization of ZVS and minimum reflux power control is mutually restricted in theory. In order to solve this problem, this paper proposes a minimum reflux power dual phase shift control strategy based on ZVS. By segmenting the transmission power under double phase shift, the first section takes ZVS as a constraint condition to obtain the minimum backflow power control strategy under ZVS condition, and the second section realizes the minimum backflow power control strategy under given transmission power by （Karush-Kuhn-Tucker,KKT） condition method. By comparing the proposed control strategy with the traditional dual phase shift control, it is found that the proposed control strategy has less backflow power and current stress, and improves the performance of the converter. Finally, an experimental prototype is built based on the proposed control strategy to verify the correctness and effectiveness of the control strategy.
关键词
直流微电网 /
双向全桥DC-DC变换器 /
双重移相控制 /
回流功率 /
零电压开关（ZVS） /
KKT条件法
Key words
DC microgrid /
bidirectional full-bridge DC-DC converter /
dual phase-shifting control /
backflow power /
zero voltage switching /
KKT condition method
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