An Optimal Scheduling Method for Flexible Medium-Voltage DC Power Distribution Center Containing Multiple Microgrids

Abstract

The invention discloses an optimal dispatching method of a flexible medium-power direct-current distribution center containing multiple micro-grids. The optimal dispatching method comprises the stepsthat upper controllers of all sub-systems control optimal dispatching in the sub-systems; the medium-power direct-current upper controllers collect the transmission power of DC-AC and DC-DC interconnecting devices in real time, and communicate with an alternating current distribution management system and upper controllers of all the alternating-current and direct-current micro-grids; the upper controllers of all the alternating-current and direct-current micro-grids issues power instructions to DC-AC and DC-DC according to the optimal dispatching goals of the alternating-current and direct-current micro-grids, and control the intercommunication power of the alternating-current and direct-current micro-grids and the medium-power direct-current distribution center, and coordinated control over regions is achieved. The technical problems are solved that in the prior art, optimal dispatching is not conducted in the sub-systems of the micro-grids, coordinated control is not conducted between the sub-systems, so that the whole system is poor in stability, and the safe operation of the system is affected.

Description

technical field [0001] The invention belongs to the field of optimal dispatching of microgrids and distribution networks, and in particular relates to an optimal dispatching method for a flexible medium-voltage DC power distribution center containing multiple microgrids. Background technique [0002] The interconnection between feeders in traditional power distribution systems is usually designed based on segmental tie switches. In actual operation, the power supply mode of closed-loop design and open-loop operation is often adopted. With the large-scale access of distributed power, energy storage, electric vehicles, and micro-grids, and the widespread implementation and application of new technologies such as active power distribution, self-healing control, and demand-side response, conventional network connection methods based on conventional contact switches It has become the main bottleneck restricting the further improvement of the operating economy, flexibility and rel...

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Problems solved by technology

[0015] The technical problem to be solved by the present invention is to provide an optimal scheduling method for a flexible medium-voltage DC power distribution center containing multiple microgrids, so as to solve the problem that each subsystem of the microgrid in the prior art does not perform optimal scheduling, and there is no Coordinated control, due to the uncertainty of distributed power output and load forecasts in microgrids, such as sudden strong convective weather leading to sharp drops in photovoltaic output and short-term load surges, etc., resulting in poor stability of the entire system and affecting Technical issues such as system security operation

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