Distributed photovoltaic power factor optimization system and method

Abstract

The invention discloses a distributed photovoltaic power factor optimization system and method. The system includes a transformer output terminal connected to a photovoltaic grid connection, a workshop dynamic load, and a reactive power cabinet. Among them, the first measurement point is set at the transformer output end, the second measurement point is set at the photovoltaic grid-connected end, and the third measurement point is set at the power load end of the workshop. An intelligent controller, the intelligent controller is connected to the first measuring point. The first measurement point collects the active power and reactive power at the output end of the transformer, and uploads the measured data to the intelligent controller. The intelligent controller calculates the reactive power compensation and transmits the reactive power compensation command to the inverter. The inverter dynamically outputs reactive power compensation. The invention can adjust the power factor in real time, dynamically allocate reactive power, and simultaneously simplify the system requirements required for power adjustment.

Description

technical field [0001] The present invention relates to a power factor optimization system and method, more specifically, to a distributed photovoltaic power factor optimization system and method. Background technique [0002] Photovoltaic power generation generates direct current, which is converted into alternating current after passing through the inverter. There is an inductive effect during the inverter, so the alternating current after the inverter will not have a power factor equal to 1, and the current must lag behind the voltage, so There is the power factor. [0003] Distributed photovoltaic power generation mainly uses the limited roof of the factory to share the original power transformation and distribution assets of the factory to build a distributed photovoltaic power station. The system mainly consists of solar cell arrays, inverters, AC power distribution cabinets, metering cabinets, and support systems Composition, using the photovoltaic effect at the semi...

AI Technical Summary

Problems solved by technology

Compared with the reactive power control of large power plants, the power factor control of distributed power plants is more complicated:

[0005] 1. Difficult to control: the output power of distributed power stations and the power load in the plant area will change in real time, and some plant areas fluctuate greatly, so the control system needs to be adjusted quickly

[0006] 2. Larger requirements for reactive power capacity: Generally, large-scale power plants are equipped with reactive power devices according to about 20% of the power plant capacity, while distributed photovoltaic power plants have different capacity and load capacity in different plant areas, and the reactive power capacity that needs to be adjusted fluctuates relatively large

[0007] 3. It is very difficult to balance the reactive power of the inverters: the power station in the factory area is affected by factors such as roof size, layout, and fragmentation, and the design is relatively complicated. It is difficult to control the reactive power output ratio of each inverter

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