Control device and method for wind/solar/water complementary power generation system

Abstract

The invention discloses a control device and method for a wind/solar/water complementary power generation system, belonging to the technical field of renewable energy utilization. The control device disclosed by the invention comprises a wind power generation equipment control circuit, a micro-hydroelectric power generation equipment control circuit, a solar power generation equipment control circuit, a voltage/current detection circuit, a voltage frequency measurement circuit, a relay driving circuit, an MOSFET (metal-oxide semiconductor field effect transistor) driving circuit, a voltage stabilizing circuit, a single chip for storing programs and a peripheral circuit of the single chip. The method estimates the remaining electric quantity of a storage battery according to the working voltage and current of the storage battery, judges the working state of the system according to the remaining electric quantity and the working current of the storage battery, and controls the power generation capacity of the power generation equipment according to the working state of the system; and particularly when the storage battery is full, the power generation equipment and the storage battery are not cut off, and the power generation equipment is controlled to supply power to a load independently, thus the renewable energy can be more sufficiently used. Through the invention, the remaining use time of the electric quantity of the system is displayed in real time so that a user can reasonably distribute the electricity consumption; and by using a pluggable wireless communication circuit, remote monitoring on the system can be flexibly realized.

Description

technical field [0001] The invention relates to a control device and method for a distributed renewable energy complementary power generation system, in particular to a control device and method for a wind-solar-hydro hybrid power generation system. Background technique [0002] At present, non-renewable energy sources are being exhausted day by day, and environmental pollution is serious, so it is necessary to develop various forms of renewable alternative energy sources. Wind, light, and water have become ideal renewable alternative energy sources due to their abundant reserves, clean and pollution-free characteristics. However, the intermittence and seasonality of wind, light and micro-hydraulic resources alone cannot provide stable and continuous power. It is necessary to develop various forms of complementary energy generation systems and their controllers to make full use of their complementarity in time and seasons. To improve the continuous stability of the system p...

AI Technical Summary

Problems solved by technology

At present, the existing solar-hydro hybrid power generation controllers mainly have the following deficiencies: 1) Simply connecting the three resources together does not make full use of the respective characteristics of the three energy sources to maximize the power generation efficiency of the three power generation equipment at the same time; 2) Use the terminal voltage of the battery to estimate the remaining power and judge the working status of the battery and the system, but the remaining power of the battery is not only related to the battery terminal voltage, but also closely related to the charging and discharging current of the battery

With the change of battery charge and discharge current, especially in the case of large charge and discharge current, the battery terminal voltage can no longer accurately reflect the remaining power of the lead-acid battery, resulting in a wrong judgment on the working state of the system, making the control effect worse or even worse. Invalid; 3) The remaining usage time of the battery cannot be displayed, the user cannot obtain the operating status of the system, and cannot reasonably arrange the power consumption time according to the actual situation; 4) The remote monitoring of the operating status of the system cannot be flexibly realized, and the need for multiple power generation It is inconvenient for small and medium-sized electric fields where the equipment is remotely monitored, and for research units that require system power generation data; 5) The system is only protected according to the battery terminal voltage. Power supply, without judging the working status of the system from the perspective of the whole system, dynamically and rationally adjusting the working status of each power generation equipment, and failing to use renewable energy with maximum efficiency

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