课题针对高比例可再生能源下直流电力网络的复杂特性，深入研究了系统的容量规划、电压稳定性以及自适应虚拟惯性控制问题。主要内容包括：1）考虑可再生能源的强不确定性及输电损耗，给出实现系统源-网-荷功率平衡的充分条件，确立了实现新能源互补配比以及装机容量的容量规划，保证系统不间断供电。2）给出分布式控制下直流电力网络的平衡点存在性与稳定性分析方法，提出多重负阻抗以及通信延时下系统稳定的解析条件，保证系统在多重恒功率负载下的安全稳定运行。3)针对电力电子化网络低惯性问题导致的电压频繁波动，提出自适应虚拟惯性控制策略及其协调优化设计方案，提高了电压抗扰能力，保证系统在容量约束下具有整体最优惯性，兼顾系统安全性以及电压暂态性能。通过研究，将构建一个安全、可靠、高效的智能化直流电力网络，为我国智能电网的真正实现奠定基础。

This project focuses on the complex characteristics of DC power grid under the condition of high-permeability renewable energy. In this way, the capacity planning, voltage stability and adaptive virtual inertial control of the system are worth to be deeply studied. The main concerns of this project are as follows: 1) Considering the strong uncertainty of renewable energy and transmission loss, the sufficient condition for realizing the balance of system’s source-grid-load power is given. Besides, the capacity planning of realizing the complementary ratio of new energy and reasonable installed capacity are established to guarantee the uninterrupted power supply of the system. 2) The existence and stability analysis method of the equilibrium point of DC power grid under distributed control is given . An analytical solution for the stability of the system with multiple loads and communication delay is proposed to ensure the safe and stable operation of the system. 3) To suppress voltage fluctuations caused by the low inertia of power electronic grid, an adaptive virtual inertial control strategy and its coordination optimization design scheme are proposed to improve the anti-disturbance capability of voltage and ensure the overall optimal inertia of the system under the capacity constraints, as well as the system security and voltage transient performance. Through the research of this project, a safe, reliable and efficient intelligent DC power grid will be built , which will lay the foundation for the real realization of China's smart grid.