双馈风机机电暂态模型及规模化风光并网系统受扰特性

Electromechanical Transient Simulation Model of Double Fed Induction Generator and Disturbed Characteristic of Scale Wind/Photovoltaic Hybrid System

双馈风机是风力发电的主力机型之一,建立其机电暂态仿真模型,是研究规模化风电与电网交互作用的基础。首先依据风机有功功率和无功功率调节控制,以及风机与交流电网交互接口等不同功能划分,建立了双馈风机机电暂态仿真模型总体架构;详细解析了对应各功能的模型结构及关联关系,指明其特点和适用性。研究了风电场并网系统受扰功率特性,以及电压反馈控制、电压波动速率和波动幅度等因素对功率特性的影响。针对青海海西规模化风光新能源并网系统,提出利用风电场汇集线无功电源特性降低光伏低电压脱网威胁的措施,仿真结果验证了措施的有效性。

Double fed induction generator （DFIG） is the main type of wind power generation, thus the electromechanical transient simulation model of DFIG is the basis for studying the interaction between the scale wind power farm and power grid. We established an overall architecture of DFIG＇s electromechanical transient simulation model according to the DFIG＇s active and reactive power regulation control as well as different function partition in DFIG interfacing with the AC grid. Model structure and relationships of functions are analyzed in detail. The applicability and limitation of the model are specified. The disturbed power characteristics of wind farm accessing into the power grid are studied, and the influences of voltage feedback control, voltage fluctuation rate and amplitude on the power characteristic are also studied. In the accessing of scale wind power and photovoltaic （PV） power farm into the Qinghai-Haixi pwer grid, measures are proposed to reduce the tripping threat of PV power generation under low voltage by utilizing the reactive power features of wind power pooling bus. Simulation results verify the effectiveness of the measures.