This paper proposes a triple output converter with buck, boost and inverted outputs and controlled through duty cycle estimation. In the existing converter, to generate the negative output, the power flows from load t...This paper proposes a triple output converter with buck, boost and inverted outputs and controlled through duty cycle estimation. In the existing converter, to generate the negative output, the power flows from load to the supply (from the boost output to the supply) during a part of the cycle, which increases cycle time and losses, and reduces the power level. To overcome this, a modified converter with a main and an auxiliary inductance and with reduced number of switches is proposed. The converter can operate in continuous and discontinuous conduction modes and the outputs can be independently controlled. An analysis of the converter is done for both modes. A simplified control of the converter through duty cycle estimation is suggested to regulate the outputs, which does not have the constraint that the current ripple has to be small. The control works both in the continuous and discontinuous modes. The simulation results closely match with the analysis. A prototype of the converter is constructed with a Spartan FPGA system and results have been presented.展开更多
针对海上风电高压直流传输效率和可靠性不高的问题,把精简矩阵变换器(reduced matrix converter,RMC)应用到海上风力发电系统中,深入分析了RMC换流器拓扑及其双极性空间矢量调制策略。为了提高海上风电高压直流输电系统在岸上交流电网...针对海上风电高压直流传输效率和可靠性不高的问题,把精简矩阵变换器(reduced matrix converter,RMC)应用到海上风力发电系统中,深入分析了RMC换流器拓扑及其双极性空间矢量调制策略。为了提高海上风电高压直流输电系统在岸上交流电网电压跌落等故障情况下的持续运行能力,提出了基于RMC换流器的海上风电多端口高压直流输电系统(MTDC,multi-terminal high voltage direct current)拓扑,分析了RMC换流器、岸上VSC换流器、超级电容器储能3个端口之间的协调控制策略,通过超级电容器储能实现了系统的功率平衡控制,提高了系统的低电压穿越能力。文章对一个三端口RMC-MTDC进行了Matlab仿真,实验结果验证了所提控制策略的正确性和可行性。展开更多
文摘This paper proposes a triple output converter with buck, boost and inverted outputs and controlled through duty cycle estimation. In the existing converter, to generate the negative output, the power flows from load to the supply (from the boost output to the supply) during a part of the cycle, which increases cycle time and losses, and reduces the power level. To overcome this, a modified converter with a main and an auxiliary inductance and with reduced number of switches is proposed. The converter can operate in continuous and discontinuous conduction modes and the outputs can be independently controlled. An analysis of the converter is done for both modes. A simplified control of the converter through duty cycle estimation is suggested to regulate the outputs, which does not have the constraint that the current ripple has to be small. The control works both in the continuous and discontinuous modes. The simulation results closely match with the analysis. A prototype of the converter is constructed with a Spartan FPGA system and results have been presented.
文摘针对海上风电高压直流传输效率和可靠性不高的问题,把精简矩阵变换器(reduced matrix converter,RMC)应用到海上风力发电系统中,深入分析了RMC换流器拓扑及其双极性空间矢量调制策略。为了提高海上风电高压直流输电系统在岸上交流电网电压跌落等故障情况下的持续运行能力,提出了基于RMC换流器的海上风电多端口高压直流输电系统(MTDC,multi-terminal high voltage direct current)拓扑,分析了RMC换流器、岸上VSC换流器、超级电容器储能3个端口之间的协调控制策略,通过超级电容器储能实现了系统的功率平衡控制,提高了系统的低电压穿越能力。文章对一个三端口RMC-MTDC进行了Matlab仿真,实验结果验证了所提控制策略的正确性和可行性。
基金The authors would like to thank the Fund of the Changchun Jingyuetan Remote Sensing Test Station,CASThis work couldnot have been done without the financial support
