双馈风机等效惯量控制比例系数对系统功角首摆稳定的影响机理分析  

Mechanism Analysis of Effect of Equivalent Proportional Coefficient of Inertia Control of DFIG on Stability of First Swing of Power Angle

作　　者：王科[1] 秦文萍[1] 张宇[1] 朱志龙 薛邵锴 Wang Ke;Qin Wenping;Zhang Yu;Zhu Zhilong;Xue Shaokai(Shanxi Key Laboratory of Power System Operation and Control Taiyuan University of Technology,Taiyuan 030024 China)

机构地区：[1]电力系统运行与控制山西省重点实验室(太原理工大学),太原030024

出　　处：《电工技术学报》2023年第3期741-753,共13页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金联合基金重点项目(U1910216);山西省科技重大专项(20181102028)资助。

摘　　要：随着具备惯量调节能力的双馈风力发电机组大规模接入电网,电网的功角稳定特性变得更加复杂。该文以双馈风机(DFIG)接入两区域互联电网为研究背景,首先推导两区域惯性中心等效模型,分析DFIG直接接入电网时虚拟惯量对两区域惯性中心转子运动方程的影响;然后从系统暂态能量的角度出发,研究系统发生三相短路故障及负荷突增时,系统功角摆动方向不同、两区域互联系统DFIG等效惯量控制环节比例系数不同对系统加速及减速过程中暂态能量的影响,进而研究其对系统功角首摆稳定的影响机理;最后通过系统功角首摆最大偏移量对系统功角首摆稳定性进行评估,并在PSASP仿真软件中搭建两区域系统仿真模型,验证所提理论的正确性。Compared with traditional synchronous machines,doubly-fed Induction Generator(DFIG)lacks inertial response capability.Therefore,when a large-scale DFIG is connected to a power system suffering from large or small disturbances(three-phase short circuit,sudden load increase,etc.),the system inertial response capability is severely lacking and the problem of transient power angle stability is highlighted.With the continuous improvement of the DFIG virtual inertia control technology,the DFIG can provide dynamic inertia support for the system.Therefore,there is an urgent necessity to carry out research on the mechanism of the effect of the DFIG’s virtual inertia on the first swing stability of the system power angle.To address these issues,this paper proposes a mechanism analysis method for the effect of equivalent proportional coefficient of virtual inertia control of DFIG on stability of first swing of power angle.Firstly,the equivalent model of two regional inertia centers is derived,and the influence of DFIG virtual inertia on the rotor motion equations of the two regions is analyzed.Secondly,from the perspective of the transient energy of the system,the influence of the equivalent proportional coefficient of virtual inertia control of DFIG in the two regions on the transient energy during the acceleration and deceleration of the system is studied when the swing direction of system power angle are different and the swing direction of influence mechanism on the first swing stability of system is further studied.Finally,the stability of the system was evaluated by the maximum deviation of the system power angle and a simulation model of the two-region interconnection system was built in PSASP to verify the proposed theory.Considering the DFIG in sending and receiving ends with additional inertia control,the following conclusions can be drawn from the simulation analysis:①When a three-phase short circuit fault occurs in the system,the power angle of the system swings in the positive direction,and the DFIG inertia

关 键 词：双馈风机 等效惯量控制比例系数 暂态能量函数 系统功角首摆稳定 

分 类 号：TM614[电气工程—电力系统及自动化]