面向海上风电大规模接入的挑战，多端直流（MTDC）系统凭借其高效的功率传输能力和灵活的控制特性，成为风电并网的重要解决方案。然而，风电出力的强波动性使得MTDC系统的功率分配与电压稳定协同控制面临严峻挑战。为此，提出一种基于波动区间划分的MTDC系统功率电压协同控制方法。首先，构建了综合考虑经济性、可靠性和灵活性的多目标优化框架，并创新性地提出了风电功率波动的三区间划分标准，以匹配不同波动强度下的系统调控需求。在此基础上，开发了区间自适应的协同优化策略，使系统运行方式与风电波动特性动态适配。进一步，提出基于可变电压参考值的多目标协调控制方法，实现换流站容量优化利用、线路负载均衡和电压稳定的协同优化。针对该复杂优化问题，采用海洋捕食者算法（MPA），有效提升了解空间的搜索能力和收敛性能。基于MATLAB/Simulink和OPAL-RT仿真平台的测试结果表明，所提方法在提升MTDC系统运行经济性和安全稳定性方面具有显著优势，为高比例可再生能源并网提供了可行的技术支撑。

Facing the challenge of large-scale access to offshore wind power, multi-terminal direct current (MTDC) system has become an important solution for grid-connection of wind power by virtue of its highly efficient power transfer capability and flexible control characteristics. However, the strong volatility of wind power output makes the cooperative control of power distribution and voltage stability of MTDC system face severe challenges. To this end, a cooperative control method of MTDC system power and voltage based on fluctuation interval division is proposed. First, a multi-objective optimization framework with comprehensive consideration of economy, reliability and flexibility is constructed, and a three-zone division criterion for wind power fluctuation is innovatively proposed to match the system regulation and control needs under different fluctuation intensities. On this basis, an interval-adaptive co-optimization strategy is developed to dynamically adapt the system operation mode to the wind power fluctuation characteristics. Further, a multi-objective coordinated control method based on variable voltage reference value is proposed to realize the cooperative optimization of optimal utilization of converter station capacity, line load balancing and voltage stability. For this complex optimization problem, the marine predator algorithm (MPA) is adopted to effectively improve the search capability and convergence performance of the solution space. The test results based on MATLAB/Simulink and OPAL-RT simulation platform show that the proposed method has significant advantages in improving the operating economy and safety stability of the MTDC system, and provides feasible technical support for the grid integration of a high proportion of renewable energy sources.