TMS320F2812-based unified control method for photovoltaic grid connection and power quality comprehensive management

Abstract

The invention discloses a TMS320F2812-based unified control method for photovoltaic grid connection and power quality comprehensive management. The core of the method is the TMS320F2812 DSP control chip, a signal conditioning circuit is matched to detect a three-phase current of a power distribution network; an instant reactive power detecting algorithm is matched with a solar photovoltaic array maximun power point tracing (MPPT) algorithm to obtain a three-phase grid connection and compensating current instruction; and according to the current instruction obtained through calculation, PWM pulses are formed with a current tracing control method of hysteresis comparison and pass through an optoelectronic isolation driving power tube, the grid connection and compensating current is injected into a power grid after filtered by a filter circuit, and the functions of power quality comprehensive management and photovoltaic grid connection power generation are achieved at the same time. The control method achieves unified control of the photovoltaic grid connection and the power quality comprehensive management based on the TMS320F2812 DSP control chip, enables the capacity of a photovoltaic grid connection power generating device to be fully utilized, eliminates unfavorable effects on the power distribution network caused by frequent switches of a grid connection system, promotes the use ratio and the cost performance of the device and has very high actual application value.

Description

technical field [0001] The invention patent belongs to the technical field of photovoltaic grid-connected power generation system control and the technical field of power quality control. Background technique [0002] Energy is an important material basis for developing the national economy and improving people's living standards. As the traditional petrochemical energy is getting exhausted, renewable energy will gradually replace fossil energy and become the energy source for sustainable development of mankind. Among the renewable energy sources, the one with the greatest potential is solar energy. Solar photovoltaic power generation is an important way to utilize solar energy. It has the advantages of non-polluting, renewable, and not subject to regional restrictions. It is also a green energy that our country mainly advocates for development and utilization. my country is quite rich in solar energy resources, and the total annual solar radiation across the country is 33...

AI Technical Summary

Problems solved by technology

[0004] However, the current photovoltaic grid-connected power generation and UPQC have their own shortcomings. Due to the change of sunlight day and night, photovoltaic power generation devices only work during the day and are disconnected from the grid at night. This not only affects the utilization of equipment, but also affects the power grid during frequent switching. stable impact

UPQC can compensate reactive power and harmonic current, but due to its high cost and single function, it is difficult to promote

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