CN202940631U - Management and control device of solar photovoltaic power generation system - Google Patents

Abstract

The utility model discloses a control device for a solar photovoltaic power generation system, which comprises a photovoltaic module 1, the photovoltaic module 1 is electrically connected to a charge controller 2, the charge controller 2 is electrically connected to a voltage detection module 3 and a storage battery 10, and the voltage detection module 3 is electrically connected to the low-voltage early warning module 4 and the discharge controller 5, the low-voltage early warning module 4 is electrically connected to the load 9, the discharge controller 5 is electrically connected to the inverter 6, and the inverter 6 is electrically connected to the AC grid-connected cabinet 7. The grid-connected cabinet 7 is connected to the load 9, the load 9 is electrically connected to the monitoring module 8, the monitoring module 8 is electrically connected to the discharge controller 5 and the AC grid-connected cabinet 7, and the battery 10 is electrically connected to the voltage detection module 3 and the discharge controller 5; It solves the problem that when the weather affects the photovoltaic modules and cannot effectively supplement the battery's electric energy, the load will be connected to consume the battery's electric energy, resulting in a gradual decline in the output voltage, and in severe cases, the load will even be forced to stop due to insufficient power supply.

Description

A control device for a solar photovoltaic power generation system

technical field

The utility model belongs to the technical field of high-voltage electrical appliances, in particular to a control device for a solar photovoltaic power generation system.

Background technique

As a green and clean energy, solar energy has been rapidly developed in recent years. It can be used as a power source for equipment and instruments, and can also be used for production and domestic electricity. Solar power generally adopts a power supply design integrating light and storage, that is, the battery supplies power to the load, and then uses solar energy to charge the battery. It has the outstanding advantages of simple structure and good mobility, and provides power supply support for the flexible arrangement of loads. As a distributed The power point of power generation is especially suitable for scattered vast rural areas; however, solar photovoltaic power generation systems are often affected by the weather: in case of continuous rainy weather, photovoltaic modules cannot effectively supplement the battery because of the limited capacity of the battery itself , but the load's consumption of electric energy cannot be interrupted. Once this situation lasts for a long time, the output voltage will gradually drop, and in severe cases, the load may even be forced to stop due to insufficient power supply.

For this reason, it is particularly important to implement the management and control of solar photovoltaic power generation systems, and it is imminent to research and develop a control device for solar photovoltaic power generation systems.

Contents of the invention

The technical problem to be solved by the utility model is to provide a management and control device for a solar photovoltaic power generation system to solve the problem that when the solar photovoltaic power generation system is affected by the weather and the photovoltaic module cannot effectively supplement the power of the battery, the load is always connected to consume the power of the battery, resulting in output The voltage will drop gradually, and in severe cases, it may even cause the load to be forced to stop due to insufficient power supply.

Technical scheme of the utility model:

A management and control device for a solar photovoltaic power generation system, which includes a photovoltaic module, a load and a battery, the photovoltaic module is electrically connected to a charge controller, the charge controller is electrically connected to a voltage detection module and a battery, the voltage detection module is connected to a low-voltage early warning module and a discharge control electrical connection, the low-voltage early warning module is electrically connected to the load, the discharge controller is electrically connected to the inverter, the inverter is electrically connected to the AC grid-connected cabinet, the AC grid-connected cabinet is connected to the load, the load is electrically connected to the monitoring module, and the monitoring module It is electrically connected with the discharge controller and the AC grid-connected cabinet, and the battery is electrically connected with the voltage detection module and the discharge controller.

The beneficial effects of the utility model:

The utility model all selects devices with low power consumption. Under the condition that the normal operation of the load can be satisfied, the selected components with low power consumption have low power consumption, which can reduce the power consumption of the entire load, thereby prolonging the service time of the storage battery accordingly. Compared with the prior art, the utility model has the following advantages: the utility model maximizes the use of solar energy to charge the storage battery, so that the storage battery can supply power to the load with high efficiency, and responds to the power demand of the load in real time, and provides a reasonable power supply for it. The continuous normal operation of the load provides the necessary support; it can prevent overcharge, overdischarge, reverse charge, overcurrent, voltage loss protection, voltage regulation, etc., which is beneficial to prolong the life of the battery and provide power for the load reliably ;It can feed back the operating status of the battery to the user in real time, and can issue a low-voltage warning when the battery continues to fail to charge or other failures, so that the user can maintain the battery in time; it is reliable in operation, simple in process, convenient in production, and low in price, and can be used in small The solar power generation system can be promoted to a high degree. The utility model monitors the power of the storage battery in real time through the voltage detection module, combined with the power consumption level of the load, thereby accurately controlling the charging and discharging state of the storage battery, selectively disconnecting the power supply of the load-related components, realizing reasonable power supply distribution, and providing high-quality and high-efficiency Load power supply; solves the problem that when the solar photovoltaic power generation system is affected by the weather and the photovoltaic modules cannot effectively supplement the battery's electric energy, the load is always connected to consume the battery's electric energy, resulting in a gradual decline in the output voltage. In severe cases, the load may even be forced to stop due to insufficient power supply. issues such as luck.

Description of drawings:

Figure 1 is a schematic diagram of the device connection of the utility model.

Detailed ways:

    A management and control device for a solar photovoltaic power generation system, which includes a photovoltaic module 1, a load 9 and a storage battery 10, the photovoltaic module 1 is electrically connected to a charging controller 2, the charging controller 2 is electrically connected to a voltage detection module 3 and the storage battery 10, and the voltage detection The module 3 is electrically connected to the low-voltage early warning module 4 and the discharge controller 5, the low-voltage early warning module 4 is electrically connected to the load 9, the discharge controller 5 is electrically connected to the inverter 6, and the inverter 6 is electrically connected to the AC grid-connected cabinet 7, The AC grid-connected cabinet 7 is connected to the load 9, the load 9 is electrically connected to the monitoring module 8, the monitoring module 8 is electrically connected to the discharge controller 5 and the AC grid-connected cabinet 7, and the battery 10 is electrically connected to the voltage detection module 3 and the discharge controller 5 .

The working principle of the utility model is:

The voltage detection module 3 controls the charging and discharging state of the battery 10 by monitoring the power of the battery 10, and cooperates with the working state of the load 9 to respond to the power demand of the load 9 in real time and allocate power to it reasonably, so as to realize the maximum efficiency of using the battery , to ensure the normal operation of the load.

Below in conjunction with accompanying drawing 1 the utility model is described in detail.

As shown in FIG. 1 , the utility model includes a charge controller 2 , a voltage detection module 3 , a low-voltage early warning module 4 , a discharge controller 5 , an inverter 6 , an AC grid-connected cabinet 7 , and a monitoring module 8 . The connection relationship of each component is as follows:

分别与光伏组件1的端口I、端口

连接；充电控制器2的端口

与蓄电池10端口连接；充电控制器2的端口

与电压检测模块3的端口

连接；电压检测模块3的端口与低压预警模块4的端口

连接、电压检测模块3的端口与放电控制器5的端口

连接、电压检测模块3的端口

与蓄电池10的端口

连接； 低压预警模块4的端口

与负载9的端口

连接；放电控制器5的端口与逆变器6的端口

连接、放电控制器5的端口

与监测模块8的端口

连接、放电控制器5的端口

与蓄电池10的端口

连接；交流并网柜7的的端口与逆变器6的端口

连接、交流并网柜7的端口与监测模块8的端口连接、交流并网柜7的的端口

与负载9的端口

连接；监测模块8的端口

与负载9的端口

连接。 Port of charge controller 2 ,port

Respectively connected with port I and port of PV module 1

Connection; port of charge controller 2

with accumulator 10 ports Connection; port of charge controller 2

port with the voltage detection module 3

Connection; port of voltage detection module 3 Port with low pressure warning module 4

Connection, port of voltage detection module 3 port with the discharge controller 5

Connection, port of voltage detection module 3

port with accumulator 10

Connection; port of low pressure warning module 4

port with load 9

Connection; port of discharge controller 5 port with inverter 6

Port for connection and discharge controller 5

port with monitoring module 8

Port for connection and discharge controller 5

port with accumulator 10

Connection; port of AC grid-connected cabinet 7 port with inverter 6

Ports for connecting and AC grid-connected cabinet 7 port with monitoring module 8 Ports for connecting and AC grid-connected cabinet 7

port with load 9

Connection; port of monitoring module 8

port with load 9

connect.

The charge controller 2 judges whether to use the photovoltaic module 1 to charge the battery 10 through the charge controller 2 according to the voltage of the battery 10 detected by the voltage detection module 3 . The charge controller 2 is equipped with an overcharge protection function, and combined with the battery voltage detected by the voltage detection module 3, it is judged whether to stop charging, so as to effectively prevent the battery from being overcharged.

When the voltage detection module 3 detects that the voltage of the battery 10 is lower than 30% of the rated voltage, it starts the low-voltage early warning module 4 and transmits the early warning information to the load 9, so that the early warning information of the battery can be conveyed to the relevant operating personnel through the load 9, So that the operator can maintain the battery immediately.

The discharge controller 5 judges whether to supply power to the load 9 according to the voltage of the battery 10 detected by the voltage detection module 3 and the power supply demand of the load 9 detected by the monitoring module 8 . When the load 9 stops working and no power supply is needed, the utility model can automatically switch to the dormant state, and once the monitoring module 8 detects a signal that the load 9 needs to start, it can switch to the normal working state. The discharge controller 5 is provided with an overcurrent protection to prevent damage to the accumulator due to the large current generated by the load 9 due to a lightning strike or a short circuit.

The inverter 6 can step up the DC power transmitted by the battery and invert it into AC power to ensure that the voltage supplied to the load 9 is within the allowable working range and frequency to ensure its normal operation.

The AC grid-connected cabinet 7 determines its power demand according to the operating status of the load 9 monitored by the monitoring module 8 , and then performs reasonable switching and power distribution to ensure the normal operation of the load 9 .

Claims (1)

1. A management and control device for a solar photovoltaic power generation system, which includes a photovoltaic module (1), a load (9) and a storage battery (10), characterized in that: the photovoltaic module (1) is electrically connected to the charging controller (2), charging The controller (2) is electrically connected to the voltage detection module (3) and the battery (10), the voltage detection module (3) is electrically connected to the low-voltage warning module (4) and the discharge controller (5), and the low-voltage warning module (4) is connected to the discharge controller (5). The load (9) is electrically connected, the discharge controller (5) is electrically connected to the inverter (6), the inverter (6) is electrically connected to the AC grid-connected cabinet (7), and the AC grid-connected cabinet (7) is electrically connected to the load ( 9) connection, the load (9) is electrically connected to the monitoring module (8), the monitoring module (8) is electrically connected to the discharge controller (5) and the AC grid-connected cabinet (7), the battery (10) is electrically connected to the voltage detection module (3 ) and the discharge controller (5) are electrically connected.

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