含抽蓄电站的多端柔性直流电网风光接入容量配比优化方法

Optimization of Wind and Solar Power Capacity Proportion Integrated in Multi-terminal VSC-HVDC System with a Pumped Storage Power Station

针对含风、光、抽蓄电站的多端柔性直流电网,协调规划其风光接人容量配比,可以充分利用不同类型电源的互补作用,实现大规模新能源的平稳送出和消纳。提出基于时序生产模拟的多端柔性直流电网风光接入容量配比优化方法,以发电清洁性最优为目标,综合考虑柔性直流电网运行限制、新能源弃电率、负荷调峰需求和抽蓄电站运行限制等约束条件,建立适应于多端柔性直流电网的风光接入容量配比优化模型。以新能源全年出力为输入,通过时序生产模拟仿真开展模型优化计算,确定各送端换流站的风光最优接入容量配比。以某四端柔性直流电网为例开展仿真测试,结果显示所提出模型能够充分利用风光的互补作用和抽蓄电站的调节作用得到最优的风光接入容量配比,验证了所提方法的有效性和工程实用性。

In order to fully utilize the complementary characteristics between wind and solar power sources and reduce the fluctuations of renewable energy power generation, it is necessary to coordinately optimize the wind and solar power capacity proportion integrated in the multi-terminal voltage sourced converter high voltage direct current (VSC-HVDC) system. A method based on time sequence simulation is proposed to optimize the wind and solar power capacity proportion integrated in the multiterminal VSC-HVDC system with a pumped storage power station. An optimization model is built aiming at maximizing the renewable energy power generation, which takes into account such constraint conditions as the operation modes of the VSC-HVDC system, the curtailment ratio of renewable energy, the system peak shaving demand and the operation limit of the pumped storage power stations. The annual outputs of the renewable energy are incorporated as inputs, the time sequence simulation is carried out to optimize the capacity proportion of wind and solar power. The proposed method is tested on a four-terminal VSC-HVDC system with a pumped storage power station. The testing results show that the proposed method can obtain the optimal wind and solar power capacity proportion integrated in the VSC-HVDC system, consequently realizing the objective of maximal utilization of renewable energy. The case study verifies the effectiveness and applicability of the proposed method, and can provide a useful guidance on planning renewable energy and the VSC-HVDC system.