A distributed photovoltaic cluster voltage double-layer optimal droop control method

Abstract

The invention provides a voltage bilevel optimization droop control method for a distributed photovoltaic cluster, which belongs to the technical field of power system operation and control. The method includes steps of: establishing a distributed photovoltaic cluster droop curve optimization layer and a distributed photovoltaic local reactive power control layer respectively, two levels executingsimultaneously and separately, and the distributed photovoltaic cluster droop curve optimization layer periodically sending the optimization result to the distributed photovoltaic local reactive power control layer to enable the latter to adjust the reactive power output in real time according to the fluctuation of the system state, respond to the system's reactive power regulation requirements to the greatest extent, solve the contradiction between optimization calculation, cycle communication and real-time control, and reduce the photovoltaic off-net risk. The method fully utilizes the reactive power adjustment capability of distributed photovoltaic power generation nodes, reduces the calculation burden of the system, and reduces the operation and maintenance cost.

Description

technical field [0001] The invention relates to a distributed photovoltaic cluster voltage double-layer optimized droop control method, which belongs to the technical field of power system operation and control. Background technique [0002] With the increasing attention to environmental pollution and the comprehensive advancement of smart grid construction, the installed capacity of renewable energy power generation and grid-connected power generation continue to increase, and the time-varying and complex problems of grid operation have become increasingly prominent, greatly increasing the power grid operating risks and control difficulties. In recent years, the state has issued a series of policy documents to vigorously support the promotion and application of distributed resources, and the State Grid Corporation of China has also issued "Opinions on Doing a Good Job of Grid-connected Services for Distributed Power". Distributed power generation represented by distributed...

AI Technical Summary

Problems solved by technology

However, due to the large number of power generation nodes of the distributed photovoltaic power generation cluster and the scattered geographical distribution, the traditional control method needs to build a complex communication network, making the operation of the system heavily dependent on communication

Once the communication fails, the system will face the risk of a global crash, resulting in reduced system reliability

In addition, in the current medium and low voltage power distribution network in actual operation, due to the high construction cost of the communication private network, the construction of the communication system is not perfect, and the operation data and control instructions cannot be collected and issued in real time in many cases.

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