Off-grid type group sharing solar power generating and supplying system structure and method

Abstract

The invention belongs to the technical field of solar power generating and supplying, in particular to an off-grid type group sharing solar power generating and supplying system structure and a method. A system is provided with a time delay regulator (an agreed signal is adopted for a request, and an anti-collision processing is performed) for delay control in the extreme condition that an instantaneous peak occurs when power is used by a plurality of systems at the same time, so that overdischarge is prevented, and a storage battery is effectively protected from damage. In the condition that one group of the off-grid type group sharing solar power supplying system meets the requirement of the same load power consumption used for connecting the system, the system proportion is designed to the condition that the nominal capacity of the storage battery is 1.5 to 2.5 times the peak power Wp capacity of a solar power generating component, and the nominal capacity more than 10 times the peak power Wp capacity is not needed any longer, so that the investment scale and the solar power generating and supplying cost are reduced. Because the power can be mutually distributed by a plurality of off-grid type group sharing solar power supplying systems, and the solar power generating components and the storage batteries supply the power to loads at the same time, the amount of the solar power generating components of each off-grid type group sharing solar power supplying system can be reduced by more than 30% when the requirement of the same load power consumption used for connecting the systems is met.

Description

technical field [0001] The invention belongs to the technical field of solar power generation and power supply, and in particular relates to a structure of an off-grid group sharing solar power generation power supply system. technical background [0002] Renewable clean energy technology is one of the most decisive technical fields in the development of the world economy in the 21st century. It has the advantages of ubiquity, inexhaustibility, and no environmental pollution. It plays an increasingly important role in the sustainable development of energy in the world and in my country. role. As an inexhaustible source of energy that is ecologically pure and does not change the fuel balance on the earth, solar energy has the advantages of large total energy and easy miniaturization. Therefore, its development and utilization have become more and more popular in recent decades. are getting more and more attention. Solar energy utilization is one of the fastest-growing high-t...

AI Technical Summary

Problems solved by technology

However, due to the defects of the existing technology, the current off-grid independent solar power supply system increases the investment of the system, resulting in large capacity balance, large waste, and increased use costs, which seriously hinders the off-grid independent solar power supply system. Application and Development

[0004] In the prior art, when constructing an off-grid independent solar power supply system, the average power consumption and the maximum nominal power consumption are often considered in combination with the characteristics of power consumption. The maximum nominal power consumption of commonly used household appliances is its More than twice the average power consumption, the peak power consumption of electrical loads including motors will be greater, which is more than 3-7 times the normal working power consumption, and the use time of the maximum power consumption is extremely short, which is the number of normal power consumption time. One ten-thousandth, from the discharge characteristics of the battery, we can know that C=I∫ t 0 tdt, high current is a surge in discharge capacity, and the power capacity needs to be increased several times for one ten-thousandth, the investment and waste can be imagined

[0005] According to the battery discharge characteristics, it can be known that C=I∫ t 0 tdt, can get C 1 =0.55C 10 (A.h), I 1 =5.5I 10 (A), that is to say, the instantaneous large current demand of the load will cause a surge in battery discharge

It can be seen that the system configuration of a single off-grid independent solar power supply system will greatly increase

[0006] At present, the cost per watt of an ordinary lead-acid battery is about 0.6 yuan (0.5-0.8 yuan), and the available electricity is 50% considering the safe discharge factor. The cost ratio in the system is about 1:1. (Of course, the system also needs electronic control part, charging circuit, inverter circuit and system control, etc.). The nominal capacity of the storage battery should be more than 6 times the peak power Wp capacity of the solar power generation components. If the peak power generated at the moment of starting the motor load is considered, its safe and normal ratio should be more than 10-12 times or even higher, and the system The electricity generated by the solar power generation components in a day is all used for charging and storage, which can only meet the storage capacity of a quarter of the storage battery. That is to say, for the civilian solar power supply system that is used every day, three quarters of the storage battery is Unreasonable configuration is one of the important reasons why off-grid independent solar power generation and power supply systems are difficult to popularize, and the irrationality of the system's ratio and control method can easily cause undercharging and overdischarging of the battery, greatly shortening the life of the battery Most of the battery life of this kind of independent solar power supply system on the market is only 1-2 years, and after half a year, it will work with illness, and the efficiency will be greatly reduced.

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