Dynamic voltage regulation control method under the condition of distributed photovoltaic cluster without communication

Abstract

The invention provides a dynamic voltage regulation control method under a distributed photovoltaic-cluster non-communication condition and belongs to the electric power system operation and control technology field. The method comprises the following steps of establishing a distributed photovoltaic cluster voltage optimization model and a branch trend equation of a distributed photovoltaic cluster respectively, and carrying out linearization on the branch trend equation so as to obtain the branch trend equation of distributed photovoltaic cluster linearization, and converting to a matrix branch trend equation; after solving a matrix equation, converting the optimization model so as to acquire an approximate optimization model; using a distributed quasi-Newton method to solve the approximate optimization model; based on an iterative result, carrying out reactive power control on each node in the distributed photovoltaic cluster and determining whether iteration converges; and if the iteration converges, ending voltage control of the distributed photovoltaic cluster. By using the method, a reactive power regulation capability of distributed photovoltaic power generating nodes is fully used, construction of a communication system is avoided, a calculating burden of the system is mitigated and operation and maintenance cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to a dynamic voltage regulation control method under the condition of no communication of distributed photovoltaic clusters. 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". Distribut...

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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