摘要
由于以光伏、风电为代表的可再生能源的间歇性、随机性特征,当分布式电源高渗透率并入电网时往往导致供电线路有功、无功功率的波动,造成有源配电网潮流分布与控制复杂化,网损增加,频率和电压品质下降。为了改善这一状况,该文参考静止无功补偿器(STATCOM)的电压源型换流器(VSC)结构提出一种基于旋转移相变压器(RPST)的电压源型无功补偿器(VSVC)的新拓扑,分析VSVC在容性和感性两种典型工况下的工作原理;研究VSVC并联稳态数学模型,应用瞬时无功理论,提出一种包含功率外环控制和电流内环控制的双闭环控制策略,具有良好的鲁棒性和控制精度。最后,通过仿真和实验验证了该文所提拓扑结构以及控制策略的有效性,满足有源配电网无功补偿器的灵活配置,可实现无功功率的连续、双向调节,并具有易实现高电压、大容量化,以及成本低、易运维、抗冲击性强和耐受性好等优势。
The proportion of renewable energy represented by photovoltaic and wind power connected to the grid is increasing annually.Due to their intermittent and stochastic characteristics,it often leads to complicate power distribution,increase network losses,and degrade frequency and voltage quality.However,the existing reactive power compensation equipment cannot satisfy both accurate compensation and low cost.In recent years,scholars have also proposed some hybrid compensation devices,but most of the topologies still suffer from the dynamic response problems caused by capacitor switching.To solve the above problems,this paper proposes a topology of voltage source var compensator(VSVC)based on rotating phase shift transformer(RPST)with reference to the voltage source converter(VSC)structure of static synchronous compensator(STATCOM),which can realize continuous and bidirectional reactive power compensation by adjusting the phase shift angle of RPST.First,two primary windings of the RPSTs are connected in parallel to the grid through the connecting inductor,while the secondary windings are wired in a star pattern on both sides of the compensation capacitor.By adjusting the phase shift angle of the two RPSTs,a variable voltage phase can be synthesized on both sides of the compensation capacitor,regulating the compensated reactive power of the VSVC.When the phase shift angle is small,the amplitude of the synthesized capacitor voltage is large.The VSVC operates in a capacitive condition,emitting reactive power to the grid.When the phase shift angle is large,the capacitor voltage amplitude is small and the VSVC works in an inductive condition,absorbing reactive power from the grid.A dual closed-loop control strategy including power external loop control and current internal loop control is constructed based on VSVC to obtain the phase shift angle of the two RPSTs and then realize the closed-loop control of reactive power.Simulation results for VSVC indicate that when an inductive load of(1+j1)MV⋅A is set at the end of the
作者
颜湘武
郭燕
彭维锋
贾焦心
邵晨
赵炜
霍京明
Yan Xiangwu;Guo Yan;Peng Weifeng;Jia Jiaoxin;Shao Chen;Zhao Wei;Huo Jingming(Hebei Provincial Key Laboratory of Distributed Energy Storage and Microgrid North China Electric Power University,Baoding 071003 China;Baoding Power Supply Subsidiary Company of State Grid Hebei Electric Power Supply Co.Ltd,Baoding 071000 China;Zhuozhou Power Supply Subsidiary Company of State Grid Hebei Electric Power Supply Co.Ltd,Baoding 072750 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2023年第16期4448-4464,共17页
Transactions of China Electrotechnical Society
基金
北京市自然科学基金项目(3212037)
国网河北省科技项目“雄安城市配电网电压和潮流数字化精准调控技术研究与应用(SGHEDK00DYJS2000286)”资助。
关键词
电压源型无功补偿器
旋转移相变压器
无功补偿
新型配电网
Voltage source var compensator(VSVC)
rotary phase shifting transformer(RPST)
reactive power compensation
new distribution network
