摘要
自储能背靠背电压源型换流器的多端柔性直流(VSC-MTDC)系统功率突变时,易引起较大的直流母线电压波动。为增强自储能背靠背VSC-MTDC系统协调控制能力,提出了一种基于虚拟直流电机的自储能背靠背VSC-MTDC改进电压裕度协调控制策略。储能DC/DC在一次调节过程中采用虚拟直流电机控制,给出了储能单元二次调节过程的时间参数整定方法,并建立储能与各端口在几种典型运行工况下的协调工作机制,提升系统功率的动态调节能力和直流母线电压动态稳定性。最后对系统各种运行工况进行了仿真分析,验证了所提协调控制策略的有效性。
The self-energy storage back-to-back VSC-MTDC system can cause large DC bus voltage fluctuations when the power suddenly changes.In order to enhance the coordinated control capability of the self-energy storage back-to-back VSC-MTDC,a self-energy storage back-to-back VSC-MTDC improved voltage margin control strategy based on virtual DC generator is proposed.The energy storage DC/DC adopts virtual DC generator control in one adjustment process,the setting method of time parameters in the secondary regulation process of energy storage unit is given,this paper also establishes a coordinated working mechanism between the energy storage and each port under several typical operating conditions to improve the dynamic adjustment capability of the system power and the dynamic stability of the DC bus voltage.Finally,a simulation analysis of various operating conditions of the system was carried out to verify the effectiveness of the proposed coordinated control strategy.
作者
孙健
周建华
葛乐
肖小龙
苏伟
SUN Jian;ZHOU Jianhua;GE Le;XIAO Xiaolong;SU Wei(State Grid Jiangsu Electrical Power Company Research Institute,Nanjing 211103,China;School of Electric Power Engineering,The Nanjing Institute of Technology,Nanjing 211167,China)
出处
《电器与能效管理技术》
2021年第11期50-57,共8页
Electrical & Energy Management Technology
基金
国网江苏省电力有限公司科技项目(J2019049)。
关键词
背靠背电压源型换流器的多端柔性直流
储能
直流母线电压
协调控制策略
虚拟直流电机
back-to-back voltage source converter multi-terminal direct current(VSC-MTDC)
energy storage
DC bus voltage
coordinated control strategy
virtual DC generator
