CN114844099A - Battery power supplementing method and terminal based on light storage diesel micro-grid system - Google Patents

Abstract

The invention discloses a battery power supplement method and terminal based on an optical storage diesel microgrid system, which can monitor the battery power of the optical storage microgrid system in real time; When the storage microgrid system itself consumes power, and the battery power is lower than the first threshold, it controls the diesel generator to supply power to the user's electricity load, and controls the rectifier to be electrically connected to the diesel generator, starts the rectifier, and controls the output current of the rectifier for the optical storage microgrid. The system supplies power, so that the battery is in a state of neither charging nor discharging, or a state of charging with a current lower than a preset current threshold; in the present invention, when the battery power is lower than a preset first threshold, the diesel generator will At the same time, a rectifier is introduced to supply power to the load, so that the diesel generator can supply power to the optical storage microgrid system, avoiding the problem that the optical storage microgrid system cannot be restarted due to the serious feeding of the energy storage battery in bad weather, and ensuring the optical storage microgrid system. of stability.

Description

A battery replenishment method and terminal based on an optical diesel fuel storage microgrid system

technical field

The invention relates to the technical field of electric power control, in particular to a battery power supplement method and terminal based on an optical diesel storage micro-grid system.

Background technique

In the early days, in areas where power grids could not be laid, such as remote mountainous areas or islands, electricity was a big problem. Local residents usually used diesel generators to generate electricity. The amount of diesel used was high and the economic cost was high, and a large amount of air was generated when diesel was burned. Pollutants destroy our living environment.

Photovoltaic power generation has become the first choice for green energy configuration. However, in areas without power grids, it is impossible to directly integrate the alternating current generated by photovoltaics into the power grid. At this time, an energy storage system needs to be configured. Charge and discharge.

The photovoltaic power generation system is unstable and indirect. Under continuous rainy weather, the total electricity generated by photovoltaics is far less than the electricity consumption of residents, and may not even meet the electricity consumption of the microgrid system itself. The old diesel generators cannot be directly connected with the AC bus of the optical storage microgrid system, and cannot supply power to the energy storage battery, which leads to the serious feeding of the energy storage battery in extreme bad weather, which makes the optical storage microgrid system unable to restart.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is: to provide a battery replenishment method and terminal based on the optical storage diesel microgrid system, so as to avoid the problem that the optical storage microgrid system cannot be restarted due to severe feeding of the energy storage battery in bad weather.

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is:

A method for battery replenishment based on an optical diesel fuel storage micro-grid system, comprising the steps of:

S1. Real-time monitoring of the battery power of the optical storage microgrid system;

S2. When the power generation of the photovoltaic inverter in the optical storage microgrid system is lower than the power consumption of the optical storage microgrid system itself, and the battery power is lower than the first threshold, control the diesel generator to supply power for the user's electricity load, and at the same time Controlling the rectifier to be electrically connected to the diesel generator, starting the rectifier and controlling the output current of the rectifier to supply power to the optical storage microgrid system, so that the battery is in a state of neither charging nor discharging or at a lower current than a preset current Threshold current for charging state.

In order to solve the above-mentioned technical problems, another technical scheme adopted by the present invention is:

A battery charging terminal based on an optical storage diesel microgrid system, comprising a processor, a memory and a computer program stored in the memory and running on the processor, when the processor executes the computer program The steps in the above method for battery replenishment based on an optical diesel storage micro-grid system are implemented.

In order to solve the above-mentioned technical problems, another technical scheme adopted by the present invention is:

A light-storage diesel microgrid system, comprising an optical-storage microgrid system, a diesel generator, an energy management system, a rectifier, an ATS automatic transfer switch, a primary load and a secondary load;

The light-storage microgrid includes an AC power distribution unit, an energy-storage converter, an energy-storage battery unit, a photovoltaic inverter and a photovoltaic assembly, the photovoltaic assembly is connected to the photovoltaic inverter, and the energy storage battery unit connected with the energy storage converter, the energy storage current device and the photovoltaic inverter are connected with an AC cable, and connected with the ATS automatic transfer switch through the AC cable;

The optical storage microgrid system and the diesel generator are respectively electrically connected to the ATS automatic transfer switch, and the automatic transfer switch is electrically connected to the rectifier, the main load and the secondary load respectively through a contactor are respectively connected, and the rectifier is also connected with the energy storage battery unit;

The energy management system is electrically controlled and connected to the optical storage microgrid system, the diesel generator, the rectifier and the ATS automatic transfer switch, so as to realize the optical diesel storage based microgrid described in the first embodiment above. The battery charging method of the system.

The beneficial effect of the present invention is that: the present invention adjusts the power supply state of the user's electricity load according to the battery power of the optical storage micro-grid system, and when the battery power is lower than the preset first threshold, the diesel generator will carry out the adjustment of the user's power supply to the user. The power supply of the load can avoid the problem that the solar storage microgrid system cannot be restarted due to the serious feeding of the energy storage battery in bad weather. At the same time, a rectifier is introduced, so that the diesel generator can supply power for the optical storage microgrid system, avoiding the photovoltaic inverter to generate electricity. It is not enough to support the power consumption of the optical storage microgrid itself, which leads to the situation that the battery continues to feed, which further ensures the stability of the optical storage microgrid system, and makes the battery of the optical storage microgrid in a state of no charge and no discharge or lower than the preset current. The low-current charging state of the threshold reduces the energy conversion of the system and improves the system efficiency.

Description of drawings

Fig. 1 is a flow chart of a battery charging method based on an optical diesel storage microgrid system according to an embodiment of the present invention;

2 is a structural diagram of a battery power supply terminal based on an optical diesel storage microgrid system according to an embodiment of the present invention;

3 is a schematic block diagram of a main circuit principle based on an optical diesel storage microgrid system according to an embodiment of the present invention;

4 is a schematic block diagram of a communication principle of a battery charging method based on an optical diesel storage microgrid system according to an embodiment of the present invention;

FIG. 5 is a detailed flowchart of a battery charging method based on an optical diesel storage microgrid system according to an embodiment of the present invention;

Label description:

1. A battery power supply terminal based on an optical diesel fuel storage micro-grid system; 2. A processor; 3. A memory.

Detailed ways

In order to describe in detail the technical content, achieved objects and effects of the present invention, the following descriptions are given with reference to the embodiments and the accompanying drawings.

Please refer to FIG. 1 and FIG. 3 to FIG. 5 , a battery charging method based on an optical diesel storage microgrid system, including the steps:

S1. Real-time monitoring of the battery power of the optical storage microgrid system;

S2. When the power generation of the photovoltaic inverter in the optical storage microgrid system is lower than the power consumption of the optical storage microgrid system itself, and the battery power is lower than the first threshold, control the diesel generator to supply power for the user's electricity load, and at the same time Controlling the rectifier to be electrically connected to the diesel generator, starting the rectifier and controlling the output current of the rectifier to supply power to the optical storage microgrid system, so that the battery is in a state of neither charging nor discharging or at a lower current than a preset current Threshold current for charging state.

As can be seen from the above description, the beneficial effects of the present invention are: the present invention adjusts the power supply state of the user's electricity load according to the battery power of the optical storage microgrid system, and when the battery power is lower than the preset first threshold, the diesel The generator supplies power to the user's load to avoid the problem that the solar-storage microgrid system cannot be restarted due to the severe feeding of the energy storage battery in bad weather. At the same time, a rectifier is introduced to enable the diesel generator to supply power to the optical-storage microgrid system, avoiding the The power generation of the photovoltaic inverter is not enough to support the power consumption of the optical storage microgrid itself, which leads to the situation that the battery continues to feed, which further ensures the stability of the optical storage microgrid system, and makes the batteries of the optical storage microgrid in a state of neither charging nor discharging or The small current charging state lower than the preset current threshold reduces the energy conversion of the system and improves the system efficiency.

Further, the user's electricity load includes a primary load and a secondary load;

The steps between the step S1 and the step S2 also include:

S11. When the power consumption of the battery is less than a preset second threshold, disconnect the power supply of the secondary load, and the optical storage microgrid system only supplies power to the primary load;

In the step S2, the control of the diesel generator to supply power to the user's electricity load is specifically:

Control the diesel generator to supply power to the main load;

The second threshold is greater than the first threshold.

It can be seen from the above description that the user's electricity load is divided into the main load and the secondary load. When the battery power is lower than the second threshold, the power supply of the optical storage microgrid system to the secondary load is disconnected, so as to avoid supplying power to the excessive load. , prolong the power consumption time of the system and improve the reliability and stability of the continuous operation of the system.

Further, the steps between the step S11 and the step S2 also include:

S12. When the power consumption of the battery falls below a preset third threshold, disconnect the power supply of the optical storage microgrid system to the main load, and use the photovoltaic inverter for the optical storage microgrid The system performs self-power supply, and starts the diesel generator, and the diesel generator supplies power to the main load;

The third threshold is greater than the first threshold and less than the second threshold.

It can be seen from the above description that when the battery power of the optical storage microgrid system is lower than the third threshold, it means that the power generation of the optical storage microgrid is not enough to load the main load of the user and the energy storage has reached the preset warning line. Turn on the diesel generator to supply power to the main load of the user, so as to ensure the power supply of the main load of the user, and avoid the phenomenon of serious power feeding of the battery.

Further, the step S2 also includes the following steps:

S21. When the battery power recovers to a fourth threshold, turn off the rectifier, and disconnect the electrical connection between the rectifier and the diesel generator.

It can be seen from the above description that when the battery power returns to the fourth threshold, it means that the photovoltaic power generation of the current photovoltaic-storage microgrid system has been able to supply its own consumption. consumption and reduce consumption and pollution caused by diesel power generation.

Further, after the step S21, it also includes steps:

S22. When the battery power recovers to a preset fifth threshold, turn off the diesel generator, and control the optical-storage microgrid system to supply power to the main load;

The fifth threshold is greater than the fourth threshold.

It can be seen from the above description that when the battery power returns to the fifth threshold, it means that the current photovoltaic power generation can store light energy on the basis of meeting its own energy consumption, and the energy storage has reached a certain level. At this time, the diesel power generation can be turned off to reduce the Pollution and consumption, the main load of users is powered by the optical storage microgrid system.

Further, after the step S22, it also includes steps:

S23. When the battery power is restored to a preset sixth threshold, control the optical storage microgrid system to supply power to the primary load and the secondary load at the same time;

The sixth threshold is greater than the fifth threshold.

It can be seen from the above description that when the battery power recovers to the sixth threshold, it means that the photovoltaic power generation is still relatively rich while meeting its own energy consumption and the main load of the user, and the power supply of the secondary load of the user can be restored at this time.

Further, the first threshold is 8% of the battery power, the second threshold is 20% of the battery power, the third threshold is 10% of the battery power, and the fourth threshold is 10% of the battery power , the fifth threshold is 40% of the battery power, and the sixth threshold is 50% of the battery power.

It can be seen from the above description that the first threshold is 8% of the battery power, the second threshold is 20% of the battery power, the third threshold is 10% of the battery power, the fourth threshold is 10% of the battery power, and the fifth threshold is the battery power 40% of the battery power, and the sixth threshold is 50% of the battery power, as a specific embodiment of the present invention.

Further, the switching of the power supply source for the user's electricity load is specifically:

Control the ATS automatic transfer switch, and switch the power supply source to the optical storage microgrid system or the diesel generator through the automatic transfer switch electrical appliance;

The ATS automatic transfer switch is respectively electrically connected with the optical storage microgrid system and the diesel generator.

It can be seen from the above description that the ATS automatic transfer switch is electrically connected to the optical storage microgrid system and the diesel generator, which can realize the switching and sharing function of new energy power generation and diesel power generation without modifying the original diesel generator.

Please refer to FIG. 2 , a battery charging terminal based on an optical storage diesel microgrid system includes a processor, a memory, and a computer program stored in the memory and running on the processor, and the processor executes The computer program implements the steps in the above method for battery replenishment based on a light-fired fuel storage micro-grid system.

As can be seen from the above description, the beneficial effects of the present invention are: the present invention adjusts the power supply state of the user's electricity load according to the battery power of the optical storage microgrid system, and when the battery power is lower than the preset first threshold, the diesel The generator supplies power to the user's load to avoid the problem that the solar-storage microgrid system cannot be restarted due to the severe feeding of the energy storage battery in bad weather. At the same time, a rectifier is introduced to enable the diesel generator to supply power to the optical-storage microgrid system, avoiding the The power generation of the photovoltaic inverter is not enough to support the power consumption of the optical storage microgrid itself, which leads to the situation that the battery continues to feed, which further ensures the stability of the optical storage microgrid system, and makes the batteries of the optical storage microgrid in a state of neither charging nor discharging or The small current charging state lower than the preset current threshold reduces the energy conversion of the system and improves the system efficiency.

Please refer to Fig. 3, a kind of microgrid system based on optical storage of diesel fuel, including optical storage microgrid system, diesel generator, energy management system, rectifier, ATS automatic transfer switch, main load and secondary load;

The light-storage microgrid includes an AC power distribution unit, an energy storage converter, a battery energy storage unit, a photovoltaic inverter and a photovoltaic assembly, the photovoltaic assembly is connected to the photovoltaic inverter, and the energy storage battery unit connected with the energy storage converter, the energy storage current device and the photovoltaic inverter are connected with an AC cable, and connected with the ATS automatic transfer switch through the AC cable;

The optical storage microgrid system and the diesel generator are respectively electrically connected to the ATS automatic transfer switch, and the automatic transfer switch is electrically connected to the rectifier, the main load and the secondary load respectively through a contactor are respectively connected, and the rectifier is also connected with the energy storage battery unit;

The energy management system is electrically controlled and connected to the optical storage microgrid system, the diesel generator, the rectifier and the ATS automatic transfer switch, so as to realize the above-mentioned battery power supplement method based on the optical storage diesel microgrid system .

As can be seen from the above description, the beneficial effects of the present invention are: the present invention adjusts the power supply state of the user's electricity load according to the battery power of the optical storage microgrid system, and when the battery power is lower than the preset first threshold, the diesel The generator supplies power to the user's load to avoid the problem that the solar-storage microgrid system cannot be restarted due to the severe feeding of the energy storage battery in bad weather. At the same time, a rectifier is introduced to enable the diesel generator to supply power to the optical-storage microgrid system, avoiding the The power generation of the photovoltaic inverter is not enough to support the power consumption of the optical storage microgrid itself, which leads to the situation that the battery continues to feed, which further ensures the stability of the optical storage microgrid system, and makes the batteries of the optical storage microgrid in a state of neither charging nor discharging or The small current charging state lower than the preset current threshold reduces the energy conversion of the system and improves the system efficiency.

The invention provides a battery power supplement method and terminal based on an optical diesel fuel storage micro-grid system, which is suitable for the scene where the power supplement and power supply control of the optical diesel fuel storage micro grid is required.

Please refer to FIG. 1 and FIG. 3 to FIG. 5 , the first embodiment of the present invention is:

As shown in Figure 3, the light-storage diesel microgrid system includes a light-storage microgrid system, a diesel generator and an energy management system, wherein the light-storage microgrid includes an AC power distribution unit, an energy storage converter, a battery energy storage unit, a photovoltaic Inverters and photovoltaic modules. Not shown in the figure is that the energy management system is electrically connected to the optical storage microgrid system, the diesel generator, the rectifier and the ATS automatic transfer switch, and the energy management system is used to control the entire Optical storage diesel microgrid for power management.

Among them, the energy storage converter operates off-grid, and the off-grid output is inverted by the energy storage battery to provide stable AC power for the optical storage microgrid. It has the function of automatic energy conversion and is the core equipment supporting the stable operation of the optical storage microgrid system. ; The photovoltaic inverter converts the direct current generated by the photovoltaic modules into alternating current, which is merged into the alternating current bus to supply power to the load or charge the battery.

The optical storage microgrid system and the diesel generator are respectively electrically connected to the ATS automatic transfer switch, and the automatic transfer switch is electrically connected to the rectifier, the main load and the secondary load of the user respectively through a contactor. As shown in Figure 3, the rectifier is connected to the ATS automatic transfer switch through contactor 1, the main load is connected to the ATS automatic transfer switch through contactor 2, and the secondary load is connected to the ATS automatic transfer switch through contactor 3; at the same time, the rectifier is connected to the optical storage microgrid The system is connected to the energy storage battery.

EMS (Energy Management System), as the core brain of this product, establishes communication connections with various devices in the system, collects operating parameters and alarm information of all devices, and displays the data on the LCD screen and APP, so that users can keep track of the system load and electricity consumption at any time. , photovoltaic power generation, energy storage remaining power and other data, as well as the operating status of each equipment.

A method for battery replenishment based on an optical diesel storage microgrid system in this embodiment, that is, to realize the power management of the optical diesel storage microgrid by the energy management system, includes the steps:

S1. Real-time monitoring of the battery power of the optical storage microgrid system;

In the embodiment of this city, the EMS obtains the constant generation power of the photovoltaic inverter by communicating with the photovoltaic inverter; the EMS obtains the current power consumption of the load by communicating with the load energy meter in the power distribution cabinet; the EMS communicates with the battery management system BMS. Communication to obtain the current remaining power of the energy storage battery; EMS obtains the operation data and status of the energy storage converter PCS through communication with the energy storage converter PCS; EMS communicates with the diesel generator to control the diesel generator switch and obtain Diesel generator operation data and status; EMS controls the rectifier on/off and obtains rectifier operation data and status by communicating with the rectifier; EMS collects the input status of the IO module and controls the output status of the IO module by communicating with the IO module.

User electricity load includes main load and secondary load;

S11. When the power consumption of the battery is less than a preset second threshold, disconnect the power supply of the secondary load, and the optical storage microgrid system only supplies power to the primary load.

In this embodiment, when the battery SOC (remaining power) is less than the second threshold, the EMS controls the contactor of the secondary load to disconnect and cut off the power supply circuit of the secondary load. load power supply. In this embodiment, the second threshold is 20% of the battery power. In other equivalent embodiments, the second threshold can be set according to actual needs.

S12. When the power consumption of the battery falls below a preset third threshold, disconnect the power supply of the optical storage microgrid system to the main load, and use the photovoltaic inverter for the optical storage microgrid The system is self-powered and starts the diesel generator, which supplies power to the primary load.

In this embodiment, when the battery SOC is less than the third threshold, the EMS sends a power-on command to the diesel generator, and after the diesel generator starts to output stably, the ATS automatic transfer switch is switched from the power generation circuit of the optical storage system to the power generation circuit of the diesel generator to provide power to the diesel generator. Main load power supply. The solar storage system operates alone, and the EMS analyzes the operation of photovoltaic inverters, energy storage converters and energy storage batteries in real time. In this embodiment, the third threshold value is 10% of the battery power. In other equivalent embodiments, the third threshold value can also be set to other values smaller than the second threshold value according to requirements.

S2. When the power generation of the photovoltaic inverter in the optical storage microgrid system is lower than the power consumption of the optical storage microgrid system itself, and the battery power is lower than the first threshold, control the diesel generator to supply power for the user's electricity load, and at the same time Controlling the rectifier to be electrically connected to the diesel generator, starting the rectifier and controlling the output current of the rectifier to supply power to the optical storage microgrid system, so that the battery is in a state of neither charging nor discharging or at a lower current than a preset current Threshold current for charging state;

In the step S2, the control of the diesel generator to supply power to the user's electricity load is specifically:

Control the diesel generator to supply power to the main load.

In this embodiment, when the power generated by the photovoltaic inverter is lower than the self-consumption power of the optical storage system (the judgment basis may be that the power generated by the photovoltaic inverter is 0kW, or the battery system is in a discharging state), the remaining power of the battery continues to When it is lower than the first threshold, the EMS controls the front-end power contactor 1 of the rectifier to pull in, and sends a power-on command to the rectifier. It is a small current (current less than 1A) charging state, that is, the power of the diesel generator is output to the optical storage microgrid through the rectifier to supplement the battery to a certain extent. In this embodiment, the first threshold is 8% of the battery power. In other equivalent embodiments, the first threshold may be set to other values smaller than the third threshold and greater than 0 according to actual needs.

When the power supply of the optical storage microgrid and the diesel generator is an independent system, adding a rectifier can solve the problem of insufficient photovoltaic power generation in continuous rainy weather. The problem of permanent battery damage. The application realizes intelligent control and power supply through diesel engine and rectifier, which can meet the requirement of unattended operation, and greatly reduce the number of on-site maintenance by maintenance personnel.

S21. When the battery power recovers to a fourth threshold, turn off the rectifier, and disconnect the electrical connection between the rectifier and the diesel generator.

In this embodiment, when the battery power recovers to the fourth threshold, the EMS controls the rectifier to shut down, and simultaneously disconnects the front-end power contactor of the rectifier. In this embodiment, the fourth threshold may be set to 10% of the battery power, and in other equivalent embodiments, the fourth threshold may also be other values. The recovery of battery power to 10% of the battery power can generally be divided into two situations. One is that the power generated by the photovoltaic inverter is greater than the power consumption of the photovoltaic storage microgrid system itself; the other is that the power of the rectifier + photovoltaic inverter > photovoltaic The self-consumption power of the microgrid system is stored, so that the SOC is restored to 10% of the battery power.

In this embodiment, the system starts the rectifier when the photovoltaic power generation does not meet the load usage and the battery power is relatively low, in order to support the stage when the photovoltaic power generation power is low or the load power consumption is large. At the same time, in order to improve the conversion efficiency of the system, reduce the power generation loss of diesel generators, save diesel costs and reduce carbon emissions, and in order to make full use of subsequent photovoltaics to restore high-power power generation and avoid abandonment of light, the diesel engine uses the rectifier to supplement the battery when the battery is powered. In the state of non-charging and non-discharging, or the charging state of small current (current less than 1A), and when the battery power is restored to 10%, the rectifier is turned off, and the electrical connection between the rectifier and the diesel generator is disconnected.

S22. When the battery power recovers to a preset fifth threshold, turn off the diesel generator, and control the optical storage microgrid system to supply power to the main load.

In this embodiment, after the photovoltaic inverter generates electricity normally (it is recognized that the output power of the photovoltaic inverter > 0kW, and the energy storage battery system has charging current data), the photovoltaic power generation first charges the energy storage battery to ensure that the SOC of the energy storage battery reaches At the fifth threshold, the EMS controls the diesel generator to shut down. After the diesel generator stops output, the ATS automatic transfer switch switches from the diesel generator power generation circuit to the photovoltaic storage microgrid system power generation circuit to supply power to the main load of the user. In this embodiment, the fifth threshold is 40% of the battery power. In other equivalent embodiments, the fifth threshold can be adjusted according to actual needs on the basis that it is greater than the fourth threshold.

S23. When the battery power recovers to a preset sixth threshold, control the optical storage microgrid system to supply power to the primary load and the secondary load at the same time.

In this embodiment, on the basis that the optical storage microgrid system supplies power for the main load, when the battery power continues to recover and the battery SOC reaches the sixth threshold, the EMS controls the secondary load contactor to close, and the optical storage system is the main load at the same time. load and secondary load power supply. In this embodiment, the sixth threshold is 50% of the battery power. In other equivalent embodiments, the sixth threshold can be adjusted according to actual needs on the basis that it is greater than the fifth threshold.

After the battery is fully charged, the generated power of the photovoltaic inverter is controlled, the electrical load and the generated power are equal, and the system maintains a stable running state with full power.

Its operation changes according to the weather:

When there is sufficient sunlight during the day, the load mainly uses the electricity generated by photovoltaics; the excess electricity generated by photovoltaics is absorbed by the energy storage system, and the energy is stored in the energy storage battery, which is discharged when needed; after the energy storage battery is fully charged, the photovoltaic reverse The inverter generates power, controls the load power to be equal to the photovoltaic power, and the system maintains a stable operation state with full power.

In rainy weather or at night, the photovoltaic stops generating electricity, and the energy storage battery is discharged through the energy storage converter to supply power to the load to ensure normal electricity consumption for customers. When the SOC of the energy storage battery is lower than the protection set value, the diesel generator is started to work, and the ATS automatic transfer switch will switch the power consumption from the optical storage microgrid system to the diesel generator system.

Please refer to Fig. 2, the second embodiment of the present invention is:

A battery charging terminal based on an optical storage diesel microgrid system, comprising a processor, a memory and a computer program stored in the memory and running on the processor, when the processor executes the computer program The steps in the first embodiment above are implemented.

Please refer to FIG. 3 , the third embodiment of the present invention is:

A light-storage diesel microgrid system, comprising an optical-storage microgrid system, a diesel generator, an energy management system, a rectifier, an ATS automatic transfer switch, a primary load and a secondary load;

The light-storage microgrid includes an AC power distribution unit, an energy storage converter, a battery energy storage unit, a photovoltaic inverter and a photovoltaic assembly, the photovoltaic assembly is connected to the photovoltaic inverter, and the energy storage battery unit connected with the energy storage converter, the energy storage current device and the photovoltaic inverter are connected with an AC cable, and connected with the ATS automatic transfer switch through the AC cable;

The optical storage microgrid system and the diesel generator are respectively electrically connected to the ATS automatic transfer switch, and the automatic transfer switch is electrically connected to the rectifier, the main load and the secondary load respectively through a contactor are respectively connected; and the rectifier is also connected with the energy storage battery unit;

The energy management system is electrically controlled and connected to the optical storage microgrid system, the diesel generator, the rectifier and the ATS automatic transfer switch, so as to realize the optical diesel storage based microgrid described in the first embodiment above. The battery charging method of the system.

To sum up, the present invention provides a method and terminal for battery replenishment based on an optical storage diesel microgrid system, which adjusts the power supply state of the user's electrical load according to the battery power of the optical storage microgrid system. When it is lower than the preset first threshold, the diesel generator will supply power to the user's load to avoid the problem that the solar-storage micro-grid system cannot be restarted due to the severe feeding of the energy storage battery in bad weather. The machine can supply power for the optical storage microgrid system, avoiding that the photovoltaic inverter power generation is not enough to support the power consumption of the optical storage microgrid itself, resulting in the situation that the battery continues to feed power, further ensuring the stability of the optical storage microgrid system, and making the optical storage microgrid system stable. The battery of the microgrid is in a state of not charging and not discharging, or a small current charging state lower than the preset current threshold, which reduces the energy conversion of the system and improves the efficiency of the system.

The above descriptions are only examples of the present invention, and are not intended to limit the scope of the patent of the present invention. Any equivalent transformations made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in related technical fields, are similarly included in the within the scope of patent protection of the present invention.

Claims (10)

1. A battery power supplementing method based on an optical storage diesel micro-grid system is characterized by comprising the following steps:

s1, monitoring the battery power of the light storage micro-grid system in real time;

s2, when the photovoltaic inverter generating capacity in the light storage microgrid system is lower than the self consumed electric quantity of the light storage microgrid system, and the electric quantity of the battery is lower than a first threshold value, the diesel generator is controlled to supply power for the electric load of a user, meanwhile, the rectifier is controlled to be electrically connected with the diesel generator, the rectifier is started, the output current of the rectifier is controlled to supply power for the light storage microgrid system, and the battery is enabled to be in a state of not charging or not discharging or a state of charging with the current lower than a preset current threshold value.

2. The method of claim 1, wherein the consumer electricity load comprises a primary load and a secondary load;

the method between the step S1 and the step S2 further comprises the steps of:

s11, when the battery power consumption is smaller than a preset second threshold value, the power supply of the secondary load is cut off, and the light storage microgrid system only supplies power for the primary load;

in the step S2, the controlling the diesel generator to supply power to the user electrical load specifically includes:

controlling a diesel generator to supply power for a main load;

the second threshold is greater than the first threshold.

3. The method for supplementing electricity to the battery based on the light-storage diesel microgrid system of claim 2, wherein between the step S11 and the step S2, the method further comprises the steps of:

s12, when the electric quantity of the battery is consumed to be lower than a preset third threshold value, the light storage microgrid system is disconnected from supplying power to the main load, the photovoltaic inverter supplies power to the light storage microgrid system, the diesel generator is started, and the diesel generator supplies power to the main load;

the third threshold is greater than the first threshold and less than the second threshold.

4. The method for supplementing electricity to the battery based on the optical storage diesel microgrid system of claim 3, wherein the step S2 is followed by the further steps of:

and S21, when the battery capacity is recovered to a fourth threshold value, the rectifier is closed, and the electric connection between the rectifier and the diesel generator is disconnected.

5. The method for supplementing electricity to the battery based on the optical storage diesel microgrid system of claim 4, wherein the step S21 is followed by the further steps of:

s22, when the electric quantity of the battery is recovered to a preset fifth threshold value, the diesel generator is turned off, and the light storage micro-grid system is controlled to supply power to the main load;

the fifth threshold is greater than the fourth threshold.

6. The method for supplementing electricity to the battery based on the optical storage diesel microgrid system of claim 5, wherein the step S22 is followed by the further steps of:

s23, when the battery power is recovered to a preset sixth threshold value, controlling the light storage microgrid system to simultaneously supply power to the primary load and the secondary load;

the sixth threshold is greater than the fifth threshold.

7. The method as claimed in claim 6, wherein the first threshold is 8% of the battery capacity, the second threshold is 20% of the battery capacity, the third threshold is 10% of the battery capacity, the fourth threshold is 10% of the battery capacity, the fifth threshold is 40% of the battery capacity, and the sixth threshold is 50% of the battery capacity.

8. The method according to claim 3 or 5, wherein the switching of the power supply source for the consumer electrical load is specifically:

controlling an ATS automatic transfer switch, and switching a power supply source to be an optical storage micro-grid system or a diesel generator through an automatic transfer switch electric appliance;

the ATS automatic change-over switch is electrically connected with the light storage micro-grid system and the diesel generator respectively.

9. A light-storage diesel microgrid system-based battery recharging terminal, comprising a processor, a memory and a computer program stored in the memory and operable on the processor, wherein the processor executes the computer program to implement the light-storage diesel microgrid system-based battery recharging method of any one of claims 1 to 8.

10. A diesel micro-grid system based on light storage is characterized by comprising a light storage micro-grid system, a diesel generator, an energy management system, a rectifier, an ATS automatic transfer switch, a main load and a secondary load;

the optical storage microgrid comprises an alternating current distribution unit, an energy storage converter, a battery energy storage unit, a photovoltaic inverter and a photovoltaic assembly, wherein the photovoltaic assembly is connected with the photovoltaic inverter, the energy storage battery unit is connected with the energy storage converter, and the energy storage converter and the photovoltaic inverter are connected with an alternating current cable and are connected with an ATS automatic transfer switch through the alternating current cable;

the light storage micro-grid system and the diesel generator are respectively and electrically connected with the ATS automatic transfer switch, the automatic transfer switch is electrically connected with the rectifier, the main load and the secondary load respectively through contactors, and the rectifier is further connected with the energy storage battery unit;

the energy management system is electrically connected with the light storage micro-grid system, the diesel generator, the rectifier and the ATS automatic transfer switch to realize the battery power supply method based on the light storage micro-grid system as claimed in any one of claims 1 to 8.

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