Intelligent reactive power optimization and coordinated control system of middle-and-low-voltage regional power grid

Abstract

The invention provides an intelligent reactive power optimization and coordinated control system of a middle-and-low-voltage regional power grid. The intelligent reactive power optimization and coordinated control system comprises a main station and one or more sub-nodes, wherein the main station is used for coordinating reactive power balance of the whole regional power grid; each sub-node is connected with the main station through a network, is used for conducting on-site reactive power balance and comprises a substation reactive power compensation intelligent control device, one or more circuit reactive power compensation intelligent control devices and one or more distribution-transformer reactive power compensation intelligent control devices. The coordinated control system from top to bottom is built in the energy transfer direction, and therefore the defect of automatic and on-site reactive power compensation of sub-node control terminals can be overcome effectively. Meanwhile, according to the comprehensive coordinated control system, by means of voltages, power factors and constraint conditions of harmonic interference, each feeder line is analyzed, control instructions are produced, then, feeder lines belonging to a 10kV outgoing line of a substation are analyzed comprehensively by making the 10kV outgoing line of the substation be the center, and after control strategies are verified comprehensively, it is guaranteed that the maximal optimization result of the system is obtained with minimal cost.

Description

Technical field [0001] The invention relates to the field of voltage and reactive power optimization of electric power systems, in particular to a smart reactive power optimization and coordinated control system for medium and low voltage regional power grids. Background technique [0002] Voltage is an important indicator to measure power quality. Voltage quality has a direct impact on stable operation of the power system, reducing line losses, ensuring safe production in industry and agriculture, improving product quality, and reducing power consumption. Therefore, ensuring voltage quality is an important task for power system design and operation. During the transmission and use of AC electrical energy, the part of electrical energy used for conversion into mechanical energy, light energy, thermal energy, etc. is called active power, and the part of electrical energy used for the exchange of electric and magnetic fields in the circuit is called reactive power. In the power sy...

AI Technical Summary

Problems solved by technology

[0015] First, the fixed compensation capacity is prone to overcompensation with the periodic changes of the load, which is not suitable for the rapid development of the power grid.

[0016] The second is that the decentralized compensation device cannot realize the comprehensive voltage and reactive power control of the power grid through joint regulation, so that the device only considers the switching situation of the equipment itself, and fails to take advantage of the characteristics of the power supply of the power grid network. The number of times the capacitor operates, prolongs the life of the device

[0017] The third is that various compensation devices lack data transmission channels, and cannot provide the control center with the necessary network real-time operation data for reactive power adjustment, and cannot meet the monitoring requirements of distribution network automation requirements

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