Method and system for optimal scheduling of reactive power in distribution network based on virtual power plant

Abstract

The invention relates to a power distribution network reactive power optimized dispatching method and a power distribution network reactive power optimized dispatching system based on a virtual power plant. Each node accessed along a feed network is connected and provided with a monitoring device. The control process comprises the steps that: when a current dispatching time period of the virtual power plant begins, the monitoring devices upload real-time voltage effective values of the accessed nodes to a centralized controller of the virtual power plant; the centralized controller establishes a reactive power optimized dispatching model and solves the model to obtain reactive output set values of distributed power supplies; and the centralized controller sends the reactive output set values to the distributed power supplies, and the distributed power supplies correspondingly output reactive power to a feeder line. Through the optimized dispatching of the centralized controller, the sum of values that voltages of the nodes in the power distribution network deviate from a rated value is minimal, the total cost of carrying out reactive dispatching on the distributed power supplies is minimal, the power supply quality and reliability is improved, the auxiliary service function of the distributed power supplies is fully exerted, the service efficiency of the distributed power supplies is improved, and the development and use of the distributed power supplies are promoted.

Description

technical field [0001] The invention belongs to the field of power distribution operation, and in particular relates to a method and system for optimal dispatching of reactive power of a distribution network based on a virtual power plant. Background technique [0002] Voltage quality is one of the most concerned indicators of distribution network operation. In the current distribution network, there is no means to comprehensively monitor the voltage of each node. Voltage regulation is carried out in substations that supply power to the distribution network, or by various The loads are compensated with reactive capacitance according to the voltage of the respective connection point. These voltage regulation measures are usually difficult to take into account the overall voltage level, and there is a lack of coordinated control methods and implementation means. [0003] It is an inevitable trend in the future power grid development that a large number of distributed power so...

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Problems solved by technology

[0004] Therefore, if we can design a distribution network reactive power optimal dispatching strategy based on the virtual power plant model, and provide reactive power services to the distribution network while giving full play to the economic benefits of distributed power generation, it will be better Playing the role of distributed power and realizing a good coordinated operation of distributed power and distribution network has important theoretical and practical value for promoting the utilization of distributed power and improving the operation reliability and power supply quality of distribution network. There is no related research in this field

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