用于小信号稳定性分析的风电机群单机等值模型  

Single-machine Equivalent Model of a Group of Wind Turbine Generators for Small-signal Stability Analysis

作　　者：董文凯 王洋[2] 王海风 DONG Wenkai;WANG Yang;WANG Haifeng(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China;School of Electrical Engineering,Sichuan University,Chengdu 610065,Sichuan Province,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206 [2]四川大学电气工程学院,四川省成都市610065

出　　处：《电网技术》2021年第4期1241-1249,共9页Power System Technology

摘　　要：针对风电并网系统小信号稳定性分析,基于线性化状态空间模型,推导了风电机群单机等值模型的表示形式,并进一步推广至多风电场并网系统、得到其动态等值表示形式。为此,首先对各风电机组采用详细模型,建立了风电机群全阶线性化状态空间模型。然后,在风电机群内风电机组型号相同、且运行状态相似的条件下,假设各风电机组线性化状态空间模型相同,进而引入变量变换,由全阶模型推导得到了风电机群单机等值模型的表示形式。在此基础上,进一步拓展至多风电场并网系统,得到了其动态等值模型的表示形式。对于一具体的风电机群或多风电场并网系统,可根据其具体形式和条件,代入建立其等值模型。最后通过仿真算例,验证了所提等值模型的有效性。In this paper, a representation for the single-machine equivalent model of a group of wind turbine generators(WTGs) is derived for the small-signal stability analysis of a wind power integrated power system based on the linearized state-space model. Then it is expanded to a multi-wind farm integrated power system(MWFIPS) and a dynamic equivalent representation is obtained. To do so, the full-order linearized state-space model of a group of WTGs(GW) is established by using the detailed models of the WTGs firstly. Secondly, under the conditions that the WTGs in the group are of the same type, from the same manufacturer and of the similar operating status, it can be assumed that the linearized state-space models of the WTGs are identical. By introducing a variable transformation, a representation of the single-machine equivalent model of the GW is derived from its full-order model. Then when it is expanded to MWFIPS, another representation for its dynamic equivalent model is also obtained. For an actual GW or MWFIPS, its dynamic equivalent model can be established according to its detailed conditions. Finally, the effectiveness of the equivalent model proposed is validated through study cases.

关 键 词：风电机群 多风电场并网系统 动态等值 小信号稳定性 

分 类 号：TM721[电气工程—电力系统及自动化]