Day-ahead-intra-day two-stage optimization scheduling method for active power distribution network

Abstract

The invention discloses a day-ahead-intra-day two-stage optimization scheduling method for active power distribution network. The method comprises the following steps of: firstly, constructing a regulation and control framework of DMS general global and regional regulation and control terminals responsible for partitioning; adopting a two-stage scheduling strategy with coordinated and unified economy and safety: executing economic scheduling in the day-ahead direction, and reducing ADN operation cost. When the intra-day stage is normal, each sub-region tracks the day-ahead plan to carry out partition local correction, and the DMS executes system global adjustment to eliminate the off-limit when the voltage exceeds the limit. A mathematical optimization model of day-ahead economic dispatching, intra-day partition local power correction and system global voltage adjustment is established, and a harmony search algorithm is adopted to solve the dispatching model. Finally, through example analysis, it is verified that the proposed scheduling method can be applied to the day-ahead and intra-day stages. The ADN economic and safe operation is ensured.

Description

technical field [0001] The invention relates to the field of optimal scheduling of a distribution network, in particular to a day-ahead-intra-day two-stage optimal scheduling method of an active distribution network. Background technique [0002] In recent years, distributed generation (DG) of renewable energy has developed rapidly. In order to improve the consumption of new energy, guide the benign interaction of "source-network-load-storage", and improve the optimal operation level of distribution network, many scholars have focused on active distribution network A large number of academic research and inventions have been carried out in the aspects of planning, regulation and operation, self-healing, safety and reliability of (ADN). Optimal scheduling, literature NickM, Cherkaoui R, Paolone M.Stochastic Day-ahead Optimal Scheduling of ActiveDistribution Networks with Dispersed Energy Storage ADN Renewable Resources[C].Technologies for Sustainability(SusTech), July 24-26, ...

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Problems solved by technology

Optimal scheduling, literature NickM, Cherkaoui R, Paolone M.Stochastic Day-ahead Optimal Scheduling of ActiveDistribution Networks with Dispersed Energy Storage ADN Renewable Resources[C].Technologies for Sustainability(SusTech), July 24-26, 2014, PortlADN, USA : 91-96 It studies the intraday situation in advance in the day-ahead stage, uses the enumeration method to deal with the uncertainty of electricity price and light load, and studies the day-ahead scheduling problem of on-load tap-changers and energy storage; the article [Active Power Distribution Network hierarchical control system and regional autonomy strategy】Proposed an ADN coordination control method combining global centralized optimization and regional decentralized autonomy, the global optimization gives the switching power plan value of each region, and the regional autonomy is based on the feedback controller to adjust the component output , and then achieve real-time calibration, but ADN reactive resources are not considered; the article [Research on Active Distribution Network Day-Ahead-Real-time Scheduling Strategy] proposes a multi-agent-based ADN two-stage scheduling strategy. Controllable DG active power is used to perform rolling correction, but it cannot effectively solve the problem of voltage over-limit; the article [Optimized dispatch and operation of active distribution network considering the risk of over-limit] introduces the semi-invariant method random power flow, and calculates in the ADN day-ahead dispatch and the risk of crossing the limit caused by multiple prediction errors of wind and wind loads, considering dispatching economy and safety at the same time in the day-ahead stage

[0003] At present, the main bottleneck restricting the large-scale integration of new energy into the distribution network is the intermittent fluctuation of green DG output, which affects the power balance and voltage qualification of the distribution network.

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