On-line monitoring and state evaluation system for photovoltaic grid-connected power generation

Abstract

The invention discloses an on-line monitoring and state evaluation system for photovoltaic grid-connected power generation. The system comprises an electric quantity collection unit, an input unit, an output unit, an ARM9 data management unit, a CPLD / FPGA interface conversion unit, a temperature and illumination measuring unit and a power supply unit. According to the invention, a multi-CPU whole embedded system that is composed of an ARM 9, an ARM7, a DSP is employed, so that reliability of a measurement control unit is substantially improved and expandability is high; an FFT is used as a basic electrical energy quality measuring algorithm, high precision sampling and synchronous transmission are utilized and real-time measurement on an environmental parameter is combined; and moreover, an inter-harmonics measuring algorithm and a harmonics source positioning and responsibility distribution method are put forward; consequently, on-line and real-time monitor on an electrical energy quality and an operation state of a photovoltaic grid-connected power station comprehensively and various stable state and transient events are recorded. Therefore, it is convenient for operation staff to visually monitor the operation state of the photovoltaic grid-connected power station as well as reliable data and sufficient basis are provided for analyzing causes of a disturbance and a fault, wherein the disturbance and the fault occur in the operation; and thus the invention of on-line monitoring and state evaluation system is an important basis for realization of new energy access of a power grid.

Description

technical field [0001] The invention relates to a distributed new energy grid-connected power generation online comprehensive monitoring platform based on multi-CPU fully embedded design, in particular to an online photovoltaic grid-connected power generation monitoring and status evaluation system. Background technique [0002] Photovoltaic power generation has the characteristics of less pollution, renewable, mature technology, and convenient installation, and has become one of the most important distributed power sources. Experts and scholars at home and abroad have done a lot of research on photovoltaic power generation. There are large random fluctuations in the output power of photovoltaic power plants with changes in light intensity, which will have adverse effects on both grid-connected and independent photovoltaic systems. Specifically, when the large power grid has sufficient reserve capacity and regulation capacity, it is generally unnecessary to consider the freq...

AI Technical Summary

Problems solved by technology

Compared with the new microprocessor, the shortcomings of this type of controller are becoming more and more obvious, such as the chip hardware function is simple, the performance is low, the real-time and scalability are poor, which makes it difficult to upgrade the system, and has certain limitations for the application of intelligent system theory. , and it is difficult to adapt to online harmonic and inter-harmonic calculation

At the same time, the existing photovoltaic grid-connected power station monitoring system does not integrate comprehensive evaluation functions, nor has an evaluation index system for photovoltaics been established, making it difficult to make comprehensive monitoring and objective evaluation of the operating status of photovoltaic grid-connected power stations

Images