摘要
级联固态变压器可以直接接入高压配电网,但其存在的直流电压不平衡和功率不均衡问题,将严重影响装置可靠运行。针对三角形级联固态变压器提出了一种多直流电压平衡控制方法,并在建立装置的平均功率模型的基础上,对比分析了其在不同控制方法下的相内和相间功率特性。所提出的方法在满足直流电压平衡和功率均衡调节的同时消除了传统方法中直流变换环节的电流传感器。通过仿真和实验对所提方法的有效性进行了验证,结果表明该方法大幅简化了控制系统,并给装置带来了更好的不平衡无功补偿能力。
Cascaded SST（ Solid State Transformer） can be directly connected to the high voltage distribution grid. However, the reliability of cascaded SST is seriously influenced by the DC voltage and power balance problem due to its own configuration. Aiming at the issue, a multi DC voltages balancing control method is proposed for cascaded SST with delta configuration, and the in-phase and inter-phase power characteristics are compared and analyzed with different control methods according to the established average power models. The proposed control method satisfies DC voltage and power balance of three-phase SST while eliminating the current sensor in the traditional DC conver- ter. The simulation and experiment verify the effectiveness of the proposed method. The results show that the pro- posed method not only simplifies the control system, but also enhances the compensation ability of reactive power.
作者
季振东
孙毅超
金成
王建华
赵剑锋
JI Zhendong;SUN Yichao;JIN Cheng;WANG Jianhua;ZHAO Jianfeng(School of Automation,Nanjing University of Science and Technology,Nanjing 210094,China;School of Electrical ＆ Automation Engineering,Nanjing Normal University,Nanjing 210042,China;Jiangsu Provincial Key Laboratory of Smart Grid Technology and Equipment,Southeast University,Nanjing 210096,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2018年第9期54-61,共8页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(51707098)
江苏省自然科学基金资助项目(BK20170841)~~
关键词
三角形
级联固态变压器
双向主动全桥
多直流电压平衡
功率均衡
电压控制
delta configuration
cascaded solid state transformer
dual active bridge
multi DC voltages balance
power balance
voltage control
