Optimal dispatching method and system of distributed photovoltaic cluster

Abstract

The invention provides an optimal dispatching method and system of a distributed photovoltaic cluster. The optimal dispatching method comprises the steps of calculating an optimal dispatching model, which is built in advance, by a master station to obtain a short-time scale optimal dispatching result, and issuing the short-time scale optimal dispatching result to a sub-station; receiving the short-time scale optimal dispatching result issued from the master station by the sub-station, and allocating the short-time scale optimal dispatching result to each photovoltaic field station; receiving an allocation result of the sub-station by the photovoltaic field station, and performing calculation to obtain a short-time scale dispatching instruction by combining the allocation result and each photovoltaic unit in the photovoltaic field station; and executing the short-time scale dispatching instruction by the photovoltaic unit to obtain an execution result. By the optimal dispatching method,the running cost and the circuit loss are reduced, and the distributed photovoltaic grid-connected capability and the control result are improved; and by the optimal dispatching method, the control dimensionality and the calculation complexity are effectively reduced, dispatching effectiveness and reliability are improved, a long-time scale optimal dispatching result is updated according to the short-time scale optimal dispatching result, and dispatching accuracy and effectiveness are improved.

Description

technical field [0001] The invention relates to the field of new energy technology, in particular to a method and system for optimal scheduling of distributed photovoltaic clusters. Background technique [0002] With the depletion of fossil energy and environmental pollution becoming more and more serious, vigorously developing clean and renewable energy has become an important energy strategy. Distributed photovoltaics have the characteristics of environmental friendliness, high reliability and high energy utilization rate. In recent years, with the maturity of distributed photovoltaic power generation technology and the gradual decline of power generation costs, the penetration rate of distributed photovoltaic The large-scale and clustered access of photovoltaics will have a major impact on the security, stability and economic operation of the distribution network. Among them, the voltage quality problem caused by the access of distributed photovoltaic clusters to the dis...

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Problems solved by technology

[0004] In order to overcome the shortcomings of high operating cost, large line loss, poor distributed photovoltaic grid-connected ability, and poor control effect in the above-mentioned prior art, the present invention provides a distributed photovoltaic cluster optimal scheduling method and system. The optimal scheduling model is calculated, and the short-time scale optimal scheduling results are obtained, and sent to the sub-stations; the sub-stations receive the short-time-scale optimal scheduling results issued by the master station, and distribute the short-time-scale optimal scheduling results to each photovoltaic field station ; The photovoltaic field station receives the allocation result of the sub-station, and calculates the allocation result combined with each photovoltaic unit in the photovoltaic field station to obtain a short-time-scale scheduling instruction; the photovoltaic unit executes the short-time-scale scheduling instruction to obtain the execution result , reducing operating costs and line losses, and improving distributed photovoltaic grid-connected capabilities and control effects

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