提出了一种与直流系统直接耦合的多机并联永磁风力发输电系统,该系统充分利用永磁直驱风电机组与轻型直流输电各自优点,适用于远距离风电直流联网.建立了dq同步旋转坐标下的永磁直驱风力发输电系统的数学模型,基于转子磁场矢量定向技术,构建了多机并联发输电系统的有功、无功解耦控制策略;基于电网电压矢量定向技术,构建了输电系统有功、无功功率的解耦控制策略.在PSCAD/EMTDC仿真平台上搭建了两台永磁直驱风电机组并联发输电仿真系统,对系统的动态特性及其无功调节能力进行了仿真分析.仿真结果表明,两机并联的发输电系统能够在不同的风况下稳定运行,且对电网具有一定的无功调控能力.%This paper presents a topology of generation and transmission system for multi parallel directly-driven permanent magnet synchronous generators (PMSG) directly coupled with the DC system, which makes full use of the respective advantages of permanent magnet direct drive wind turbine and light HVDC, and is appropriate for DC long-distance networking of wind power. The mathematical model for permanent magnet direct drive wind generation and transmission system is established under dq synchronous rotating coordinate. Based on rotor magnetic field vector orientation technique, active and reactive decoupling control strategy formulti generator paralleled transmission system is bui and based on grid voltage vector directional technology, the transmission system active and reactive power decoupling control strategy is constructed. Based on the software package PSCAD/EMTDC, the simulation system for the proposed generation and transmission system with two generator units is established and the dynamic performance and reactive regulation ability of the system are demonstrated. The simulation results show that the generation and transmission system can operate in different wind conditions and have the reactive regulating ability.
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