直流配电系统构建与运行控制

Modern distribution system faces the following challenges: dissolving different distributed sources, powering dc loads efficiently, providing high quality electric energy to load center safely and reliably, and pushing the system smarter. To relieve these problems, it is important and urgent to research and find out new modes for electric power distribution. In this project, based on analyzing the construction principle of the DC distribution system, the typical network architecture and connection will be proposed. The voltage management and control strategies will be studied by theoretical analysis and simulation method when the guidance of DC power system analysis and simulation are obtained and the mathematical models are established. The voltage collapse mechanism of DC distribution system will be investigated starting with analyzing the characteristics of the components and the proper counter-measures will be adopted. By utilizing the fast adjustment capability of the DC transformer and converter, the control methods will be studied to limit the fault current, relieve the stress on the breaker and isolate from the failure district. The space-time characteristics energy of power sources, loads, and network will be analyzed, furthermore, the energy management strategy of DC distribution system will be studied. To verify the results, a prototype of the typical DC distribution system will be established and the experimental investigation will be carried out. This project is not only to provide the theoretical foundation for DC distribution system application, but also to perfect the DC transmission and distribution theory.

配电系统正面临着消纳各种形式分布式电源、向容量持续增长的负荷中心安全输送优质可靠电能以及智能化等一系列挑战。单纯采用交流配电方式已很难满足要求，探索以直流为主导的配电模式有重要意义。通过研究直流配电系统网络构建准则，提出典型直流配电网结构和接线方式；在研究直流系统分析计算与仿真方法、建立直流配电系统模型基础上，采用理论分析和数值仿真的方法研究直流配电系统稳态电压管理策略和控制措施；从分析元件特性入手，研究V-P强耦合下直流电压崩溃机理，并提出应对措施；探索利用直流变压器和变换器的快速调节能力，实现暂态过程干预，限制故障电流和实现故障隔离；从分析电源和负荷的能量时空特性入手，研究直流配电系统能量管理策略；建立一套直流配电系统物理模拟系统，对理论分析结果进行试验研究。本项目的研究将为完善直流供电理论体系和直流配电系统实际应用打下良好基础。

随着经济、科技和电网的快速发展，配电系统面临着消纳各种形式分布式电源、向容量持续增长的负荷中心安全输送优质可靠电能以及智能化等一系列挑战，单纯采用交流配电方式已很难满足要求，探索以直流为主导的配电模式有重要意义。本课题从电力系统配电层面出发，对如何构建直流配电系统网络，以及直流配电系统运行、控制和管理等基础问题进行了深入探索与研究。在直流配电系统网络构建方面，研究了直流配电网络演化基础理论及网络构建原则，提出了一套分层分区的包含多电压等级的直流配电网络；以此为基础，构建了直流配电系统的稳态潮流模型和小干扰暂态模型，制定了直流配电系统稳态电压管理策略和控制措施，仿真验证了所制定的电压管理策略和控制措施的有效性，对于大干扰下直流电压失稳或者崩溃的情况，通过实施直流变压器和变换器的暂态过程干预，实现了故障电流限制和故障隔离；最后从分析电源和负荷的能量时空特性入手，具体给出了直流配电系统能量管理策略。本项目的研究将为完善直流供电理论体系和直流配电系统实际应用打下良好基础。