文章摘要
李振,盛万兴,段青,等.基于储能稳压的交直流混合电能路由器协调控制策略[J].电力系统自动化,2019,43(2):121-129. DOI: 10.7500/AEPS20180504003.
LI Zhen,SHENG Wanxing,DUAN Qing, et al.Coordinated Control Strategy of AC/DC Hybrid Power Router Based on Voltage Stabilization by Energy Storage[J].Automation of Electric Power Systems,2019,43(2):121-129. DOI: 10.7500/AEPS20180504003.
基于储能稳压的交直流混合电能路由器协调控制策略
Coordinated Control Strategy of AC/DC Hybrid Power Router Based on Voltage Stabilization by Energy Storage
DOI:10.7500/AEPS20180504003
关键词: 电能路由器  能源互联网  储能  虚拟同步机
KeyWords: power router  Energy Internet  energy storage  virtual motor
上网日期:2018-12-11
基金项目:国家电网公司基础性前瞻性科技项目“交直流无缝混合灵活配电系统基础理论与虚拟现实仿真方法研究”(5442PD170002)
作者单位E-mail
李振 中国农业大学信息与电气工程学院, 北京市 100083
配电变压器节能技术北京市重点实验室(中国电力科学研究院有限公司), 北京市 100192 
lizhen_SC@cau.edu.cn 
盛万兴 配电变压器节能技术北京市重点实验室(中国电力科学研究院有限公司), 北京市 100192  
段青 配电变压器节能技术北京市重点实验室(中国电力科学研究院有限公司), 北京市 100192  
李鹏华 配电变压器节能技术北京市重点实验室(中国电力科学研究院有限公司), 北京市 100192  
王建华 东南大学电气工程学院, 江苏省南京市 210018  
杜松怀 中国农业大学信息与电气工程学院, 北京市 100083  
摘要:
      将交/直/交级联变换器、直流变换器、储能及其变换器通过公共直流母线组合,构成含两个交流端口、三个直流端口的电能路由器拓扑结构。分析典型运行模式并提出储能稳压的交直流混合电能路由器虚拟同步机协调控制策略:在交流单/双端并网模式下,通过储能稳定直流电压,两端交/直、直/交变换器通过虚拟同步机功率外环控制功率流向及大小;在交流双端离网模式下,通过储能稳定直流电压的同时,配合分布式电源为交直流负荷供电。所提策略需模式切换,降低了控制复杂性,可实现电能路由器各模式下直流电压稳定、就地消纳分布式发电,保证交直流负荷持续稳定供电,还可实现双端并网时电网馈线间的柔性互联、电网故障时潮流转供以及双端离网下的自稳定运行,有效提高了低压配电网的供电可靠性。最后,通过仿真和实验验证了所提协调控制策略的正确性和有效性。
Abstract:
      AC/DC/AC converters, DC converters, energy storage and their converters are combined through a common DC bus to form the topology of power router which has two AC ports and three DC ports. Then, the typical operation modes are analyzed and the coordinated control strategy of AC/DC hybrid power router based on energy storage stabilizing voltage and virtual motor is proposed. Under the mode of single or double AC ports connecting to the grid, the power flow of two AC-DC converters are controlled by the power outer loop of virtual motor, while the DC voltage keeps steady due to energy storage. When both the AC ports are off-grid, not only keeps the DC voltage stable, but also supplies for AC and DC loads. The proposed strategy reduces the complexity of device control without mode switching. The stability of DC voltage is achieved in each operation mode, and the distributed generation is accommodated by local loads, and the constant and stable power supply for AC and DC load is ensured. Moreover, the flexible interconnection between the feeder lines of the distribution network is realized, and the power flows are transferred when the power grid fails, while the self-stable operation is realized when both the AC ports are off-grid, which effectively improves the power supply reliability of the low-voltage distribution network. Finally, the correctness and effectiveness of the proposed coordinated control strategy are verified by simulation and experiments.
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