10KVA Wind, Solar And Diesel Complementary Off-grid Power Generation System Design Plan

10KVA wind, solar and diesel complementary off-grid power generation system design plan

1: System Introduction

This system adopts a reliable power generation mode of solar cells, wind turbines, and diesel generators to meet the needs of users. According to the customer's requirements, a total of 54 monocrystalline silicon 185W/36V, 3 wind turbines 10KW, 1 10KVA 380VAC 50HZ three-phase diesel generator, 108 2000Ah/2V lead-acid maintenance-free batteries, and Guanya's wind-solar hybrid controller and three-phase off-grid inverter are selected. When the battery is fully charged, it can meet the continuous operation of 8KW load for about 3 days (8KW load per day, 12 hours of continuous operation).

This system adopts the diesel generator backup power supply mode, that is, a diesel generator input port is provided on the inverter. In general, solar panels and wind turbines charge the battery after passing through the wind-solar hybrid controller, and the battery supplies power to the load after being inverted by the inverter. When the battery is undervoltage, the system automatically switches to the diesel engine power supply state, and the diesel engine supplies power to the load; when the battery voltage is full, the system automatically switches to the battery working state.

2. Design principles:

2.1. Economy

While meeting the customer's use requirements, reduce costs as much as possible to achieve economic and practical coexistence. Considering that the cost of photovoltaic panels is higher than that of wind turbines, the power of wind turbines should be greater than that of photovoltaic panels in system configuration. In this system, the power of wind turbines is about 3 times that of photovoltaic panels. Considering continuous rainy days and low wind, if the solar panels and wind turbines are used to supply power during this period, the capacity of the battery will be difficult to meet the needs of users. Therefore, when the solar and wind power generation systems cannot generate electricity normally and the battery capacity is insufficient, we use diesel engine compensation to meet the user's electricity needs.

2.2 Safety and Reliability

As solar and wind power generation systems, they must have a high safety and reliability coefficient to ensure continuous and stable power output. Solar cell modules must have a certain wind and pressure resistance; wind turbines have a high degree of mechanical safety and reliability to prevent flying or excessive wind damage to the blades. The wind-solar hybrid controller must have a high control and display effect. The off-grid inverter has high inverter efficiency, low power consumption and small size. In order to prevent lightning strikes or strong electromagnetic interference, this system is specially equipped with a lightning protection device installed inside the control cabinet, which can effectively protect the system safety. The battery design capacity can meet the power consumption of 8KW load working for 7 hours. Even if the battery is undervoltage, the load can work normally. The system is equipped with a diesel engine input port, which can enable the diesel engine to power supply in special circumstances to ensure the stability of the system output.

2.3 Environmental protection and energy saving

The solar and wind power generation system itself is an energy-saving product, so when purchasing other accessories, it must have environmental protection functions. For example, the photovoltaic controller and off-grid inverter must control the noise and electromagnetic radiation to the lowest range, and the cable must take certain protective measures. In the long run, solar and wind power generation is not only environmentally friendly, but also cheaper than the cost of city electricity. The cost can be offset by the cost of using city electricity after the system has been used for a certain period of time, and then it will save money.

2.4 Controllability

As a whole system, controllability can improve the adaptability of the system. The system is equipped with a separate wind-solar hybrid controller with control function, which has protection functions such as overcharge, over-discharge, and unloading functions. The output display data can intuitively understand the working status of the system.

2.3 Working principle

As shown in the following figure (Figure-1), the solar cell module and wind turbine of this system are power generation elements, and the wind-solar hybrid controller is the working control and detection element. The battery stores electrical energy and provides it to the load for use; in order to improve the reliability of the system, the system is equipped with a diesel engine input port. The system can automatically switch to diesel engine power supply when the battery is fed; after the battery is charged, the system will automatically jump to solar and wind power supply. The off-grid inverter converts DC power into AC power and outputs it. The entire system design adopts a compact design, using as little space as possible to achieve the most ideal effect.