Distributed photovoltaic power factor optimization system and method

Abstract

The invention discloses a distributed photovoltaic power factor optimization system and method. The system comprises a transformer output end, wherein the transformer output end is connected with a photovoltaic grid, a workshop power load and a reactive cabinet. The transformer output end is provided with a first measuring point, a photovoltaic grid-connected end is provided with a second measuring point, and the workshop power load end is provided with a third measuring point. An intelligent controller is connected with the first measuring point. The first measurement point collects active power and reactive power of the output end of the transformer and uploads measurement data to the intelligent controller, and the intelligent controller calculates reactive compensation and transmits areactive compensation instruction to the inverter. The inverter dynamically outputs reactive compensation. According to the system and the method disclosed in the invention, the power factor can be adjusted in real time, the reactive power is dynamically distributed, and the system requirement required by power adjustment is simplified.

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. 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 semicond...

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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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