Multifunctional smart domestic photovoltaic power generation control system

Abstract

The invention relates to a multifunctional smart domestic photovoltaic power generation control system. The multifunctional smart domestic photovoltaic power generation control system is characterized by comprising a centralized monitoring system (1) and a plurality of novel inverters (2). The centralized monitoring system (1) includes a man-machine interactive module (1) and a centralized specialist database (1.2). The novel inverter (2) includes a maximum power point tracking module (2.1), a DC / AC converting module (2.2), a charge control module (2.3), a battery management system module (2.4) and a local specialist database (2.5). The multifunctional smart domestic photovoltaic power generation control system provided by the invention has advantages of being capable of connecting or disconnecting itself to a main power grid automatically during operation and realizing smart optimization adjustment of user power consumption in a local power grid.

Description

technical field [0001] The invention relates to a multifunctional intelligent household photovoltaic power generation control system. Background technique [0002] With the rapid development of the global economy and the continuous increase of population, fossil energy such as oil, natural gas and coal is being gradually consumed, and the energy crisis has become a common issue faced by all countries in the world. At the same time, a series of problems such as environmental pollution and ecological balance caused by fossil energy have also become serious obstacles restricting social and economic development and even threatening human survival. New energy applications are becoming a global hotspot. [0003] Solar energy resources are one of the most abundant renewable energy sources. It is widely distributed, renewable, and does not pollute the environment. It is internationally recognized as an ideal alternative energy source. Photovoltaic power generation is a form of dir...

AI Technical Summary

Problems solved by technology

[0010] 1. The functions realized by each part of the existing equipment are independent and have no complementary connection; nor can the charging and discharging of the battery be dynamically adjusted according to the grid voltage, battery power and photovoltaic input power parameters;

[0011] 2. The existing equipment does not have a set of monitoring system to monitor and coordinate the grid and each grid-connected inverter when multiple grid-connected devices are running, so that when more grid-connected inverters are connected to the low-voltage side of the same transformer, the power of the grid will be reduced. The quality of parameters will decrease, and the reliability of the power supply system in the whole region will decrease;

[0012] 3. The transition of the existing equipment is not smooth when the on-grid / off-grid state is switched, and it is impossible to control and adjust the operation of non-critical loads based on the off-grid power supply area load, photovoltaic input power, and battery storage capacity.

[0016] 5. Centralized control of energy storage system and how to improve overall efficiency

[0017] At present, power storage is mainly lead-acid batteries, including maintenance-free batteries and colloidal batteries, due to the influence of factors such as large size, heavy weight, high maintenance costs, pollution, and non-environmental protection, lead-acid batteries cannot be used on a large scale. application; in addition, because the lead-acid battery cannot be charged and discharged at a large rate, it cannot be coordinated and absorbed or output with the photovoltaic input control interface, and the charge and discharge efficiency of the lead-acid battery is low, and the power efficiency of the inverter after the battery energy storage is low. , leading to a reduction in the efficiency of the entire system;

[0018] 6. Contradictory issues between power grid operation safety and owner's power supply reliability requirements

[0019] In order to ensure the safety of the power grid, the distributed power generation system is not allowed to operate in an isolated manner. Therefore, when the power grid fails, the photovoltaic power generation system needs to be disconnected from the power grid in a very short time, otherwise the power grid will bring potential safety hazards, which is not allowed by the power grid access regulations. However, when many small distributed generation systems are connected, the probability of isolated operation increases a lot, which reduces the reliability of power supply. Therefore, the system must be disconnected from the grid at this time and form a visible disconnection point. The identification ability of the inverter is difficult to meet the requirements; at the same time, when the power grid power failure system is transferred, it is easy to occur that the power supply parameter transition is not smooth when switching from on-grid to off-grid operation, which will have an impact on the owner's electrical appliances. When the owner's power load is large When the shock may lead to system protection and power failure of key equipment

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