Photovoltaic grid-connected inverter having electric energy quality monitoring function

Abstract

The invention provides a photovoltaic grid-connected inverter having an electric energy quality monitoring function, and belongs to the field of solar photovoltaic power generation and clean energy application. The photovoltaic grid-connected inverter comprises a photovoltaic array, a dual-core processor, a DC boost control circuit, a supercapacitor, a DC-AC inversion circuit, a core dual-core processor, an energy storage module, an electric energy quality detection and bidirectional electric energy metering module, an electric energy quality detection and electric energy metering chip, a signal conditioning circuit, a clock circuit, a DC parameter acquisition module, an electric energy quality monitoring core chip, a DC voltage sampling circuit, a DC current sampling circuit, a transformer module, a DC/AC conversion chip, a DC/DC conversion chip, a display module and a communication module. According to the photovoltaic grid-connected inverter with the special electric energy qualitymonitoring chip and the special processor chip for the special high-integration dual-core photovoltaic inverter acting as the core, the photovoltaic grid-connected inverter has the characteristics ofbeing simple in peripheral circuit, high in operation speed, accurate in measurement and stable and reliable so that intellectualization of the photovoltaic grid-connected inverter can be realized.

Description

technical field [0001] The invention belongs to the application field of solar photovoltaic power generation and clean energy, and particularly relates to a photovoltaic inverter. Background technique [0002] As a form of renewable energy utilization, photovoltaic power generation has been paid more and more attention and vigorously developed. Distributed power generation and micro-grid have become the inevitable trend of future power grid development. Distributed power generation and micro-grid are generally integrated into the low-voltage distribution network (380V or 220V) on a household-by-household basis, which has obvious dispersion, regionality, and uncertainty. A large number of civilian new energy sources will also bring power The changes in the network pattern have gradually revealed adverse effects on the power quality of the distribution network. The invention integrates the functions of a photovoltaic inverter, a bidirectional electric energy meter and a power...

AI Technical Summary

Problems solved by technology

Although this method has a certain effect on eliminating harmonics, it has the following problems and defects: First, only the harmonic indicators of power quality are considered, and the indicators such as voltage deviation, frequency deviation, voltage fluctuation and flicker, and three-phase unbalance are not considered

Second, only Matlab simulation data is provided, and no specific harmonic detection method and circuit are given

Third, the thesis is only a theoretical research result and does not provide examples

The current grid-connected inverters for distributed solar photovoltaic power generation generally lack means for real-time monitoring of the inverter output power quality. The function of the inverter is relatively simple, and its operating reliability needs to be further improved.

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