中文摘要：

为实现了海上风电场多端直流输电系统直流网损最小,研究了一种电压下垂跟随控制策略。采集海上风电场电能参数,实时更新网侧换流站下垂增益,利用非线性规划模型来实现多端直流输电系统的优化,实现约束条件下的最优系统功率潮流。以风电场环形拓扑多端直流输电系统为例,列出目标函数和约束条件,建立最优化问题数学模型。基于序列二次规划法,针对3种电力调度模式,采用MATLAB仿真验证该控制策略的有效性。仿真结果表明,与传统电压下垂控制方法相比,该控制策略可在低风速条件下以更小的功率损失实现电能传输。

英文摘要：

A voltage updated droop control scheme is proposed in order to achieve the minimum direct current network loss for the multi-terminal high voltage DC systems. The power parameters of offshore wind farm is acquisited to update the droop gains of the grid side converters in real-time, and then the multi-terminal DC transmission system optimization problem is described as a nonlinear programming model to achieve optimal power flow in constrained conditions. The multi-terminal HVDC system with wind farm ring topology is used as an example, the objective function and constraints are listed and optimal mathematical model is established. Matlab simulations are used to verify the effectiveness of the proposed control strategy in three power dispatching modes based on the sequential quadratic programming. Simulation results show that this control strategy can transmit electric energy with minimum system loss at lower wind speed com- paring with the traditional voltage droop control method.