中文摘要：

分析了精简矩阵变换器（reduced matrix converter， RMC）双极性空间矢量调制策略，提出了基于 RMC 高频链换流器的串联多端海上风电-HVDC系统拓扑结构及其协调控制策略。该控制策略由风电场监测控制（wind farm supervisory control，WFSC）、海上风电机组控制和网侧并网控制组成，并采用最优直流电流参考算法实现。在系统正常运行时，该控制策略可实现各风电机组独立最大风能跟踪（maximum power point tracking，MPPT）控制、直流电流控制、并网有功和无功功率解耦控制；在风电机组故障和电网电压波动等情况下保证系统安全高效运行。仿真结果验证了所提拓扑及其控制策略的正确性和可行性。

英文摘要：

The reduced matrix converter （RMC） bipolar space vector modulation strategy is analyzed, and an RMC high frequency link converter based topological structure of series multi-terminal offshore wind power generation-HVDC system and its coordinated control strategy are proposed, This control strategy is composed of wind farm supervisory control （WFSC）, offshore wind power generating unit control and grid-intergrating control at power grid side and is implemented by optimal DC current reference algorithm. Using the proposed control strategy the independent maximum power point tracking （MPPT） of each wind power generating unit, the DC current control and the decoupling control of grid-connected active and reactive power can be implemented under normal operation of offshore wind farm, and the secure and efficient operation of series multi-terminal offshore wind power generation-HVDC system under wind power generating unit fault an power grid voltage fluctuation can be ensured. The correctness and feasibility of the proposed topology and control strategy are validated by simulation results.