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- 2016
多端柔性直流配电网的分层控制策略设计
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Abstract:
为了解决直流配电网中通信过程的信息传递以及优化调度与分散控制的协调问题,针对含有多类型分布式电源、换流站、储能装置和交直流负荷的直流配电网,设计了一种基于不同时间尺度的分层控制策略。在较短时间尺度内,第1层控制通过主从控制实现直流系统在稳态模式下的平稳运行;在较长时间尺度内,第2层控制通过模式切换或调整联络线功率实现系统在恶劣运行条件下的2次电压恢复;能量优化调度系统作为第3层控制,以新能源最大接纳和网损最小作为优化目标,通过最优潮流计算为系统下一层提供运行指令。通过PSCAD/EMTDC的仿真验证表明:当发生新能源功率或负荷波动时,通过主从控制模式可迅速实现系统平稳控制;当主换流站短时退出运行时,通过联络线功率调整可实现系统2次电压恢复。该分层控制策略信息传递明确,实现了优化调度与分散控制的协调配合,在各种工况下均能保证系统的可靠经济运行。
In DC distribution system, it is necessary to accomplish immediate information transmission and coordination between optimal dispatch and decentralized control. Aiming at a DC distribution system with many kinds of distributed generations, energy storage device, converter stations and loads, a hierarchical control strategy with different time scales is proposed. In a short？？term time scale, the first layer control enables to realize smooth system operation in the steady？？state mode by means of master？？slave control; in a longer time scale, secondary voltage recovery in harsh operating condition is achieved by mode switch or adjusting tie？？line power; as the third layer control, targeting maximum new energy integration and minimum network loss, energy optimal dispatch system provides operation instructions for the lower control by optimal power flow calculation. Simulation results of PSCAD/EMTDC show that when new energy power or load fluctuation occurs, the system can achieve stable control rapidly by master？？slave control; when the master converter station is out？？of？？operation, secondary voltage recovery is achieved by adjusting tie？？line power. This hierarchical control strategy realizes clear information transmission and coordinated control between optimal dispatch and decentralized control to guarantee the system to operate smoothly and economically under various conditions
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