Photovoltaic voltage reactive power automatic adjusting system

Abstract

The embodiment of the invention discloses a photovoltaic voltage reactive power automatic adjusting system. The system comprises: at least two edge devices used for collecting operation parameters of an inversion unit in a photovoltaic power plant to obtain a first collection result and sending the first collection result; access equipment used for receiving the first collection result and storing the first collection result in a database subsystem; and a central control room control substation used for obtaining the first collection result from the database subsystem after receiving a scheduling instruction, calculating reactive power required to be emitted by each controllable inversion unit according to the adjustment instruction and the first collection result, and sending the reactive power to the central control room control substation. The control instruction used for controlling output of required reactive power is generated for each controllable inversion unit, and the control instruction is sent; and the access equipment is also used for sending the control instruction to the inversion unit through the edge devices after receiving the control instruction.

Description

technical field [0001] The embodiment of the present application relates to the field of photovoltaic power generation, especially to a system for automatically adjusting photovoltaic voltage and reactive power. Background technique [0002] The increasing global energy demand has brought severe challenges to the supply of fossil energy. Accelerating energy transformation and upgrading and implementing green and low-carbon development has become a national strategy, and the safe and efficient use of large-scale new energy power is the core content of my country's energy revolution. How to effectively improve the utilization of light resources, the operating efficiency of photovoltaic power plants, and the power quality of photovoltaic power plants have become major issues faced by photovoltaic power plant operators. [0003] After a large number of photovoltaics are integrated into the grid, due to the large random fluctuations of photovoltaic power generation, the stabilit...

AI Technical Summary

Problems solved by technology

At present, in the construction process of photovoltaic power plants, most power plants adopt SVC (Static Var Compensator, reactive power compensator) / SVG (Static Var Generator, static var generator) reactive power compensation devices. The characteristics of this type of equipment are non-motion compensation Strong capability, fast response, high failure rate during operation, and large power consumption

General photovoltaic inverters also have the function of adjusting active and reactive power output, but due to factors such as insufficient communication performance of traditional monitoring systems and imperfect control strategies, its reactive power adjustment function has not played a practical role.

[0005] Communication signals such as Modbus TCP, Modbus RTU, and IEC104 in the traditional monitoring system have relatively large limitations in signal quality and cost control due to the complexity of the photovoltaic power plant environment. The traditional wired network can no longer guarantee the quality of various signals.

[0006] In addition, as the assessment requirements for automatic voltage and reactive power regulation (AVC) system indicators of photovoltaic power plants that have been put into commercial operation become more and more stringent, power plants that do not meet the requirements need to be upgraded, and a large number of photovoltaic power plants are limited by the high cost of cable laying. and the low communication performance of the original power generation equipment, it is also difficult to transform

[0007] Therefore, the above-mentioned existing photovoltaic AVC scheme obviously has inconvenience defects in structure, method and use, and needs to be further improved urgently.

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