Generator energy storage coordination control method

Abstract

The invention relates to the field of power system control and energy management, and discloses a generator energy storage coordination control method which comprises the following steps: S1, collecting real-time power of an electrical load, and judging a load state through a coordination controller; s2, selecting a working mode according to the load state and the electric quantity state of the battery system, and executing the following coordination control method: S2.1, a light load state; s2.2, performing a general load state; s2.3, in the heavy load state, when the load power is high, the coordination controller executes operation judgment according to the electric quantity state of the battery system; and S3, dynamically switching among three states of light load, general load and heavy load according to the real-time information. The operation state of the generator is intelligently adjusted through the coordination controller, so that the generator always operates close to the optimal efficiency point, the fuel economy of the generator is effectively improved, the service life of equipment is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power system control and energy management, and in particular to a generator energy storage coordinated control method. Background Art

[0002] In the field of power distribution, there are often scenarios where generators are used for power supply, or generators are used as backup power sources for mains power. In some regions and countries, due to some reasons, there may be no mains power, and the loads are completely powered by generators. In this case, the generator is used as a common power source, and its power supply efficiency directly affects the economic efficiency of power supply.

[0003] The power supply efficiency of a system powered purely by a generator is usually low, because the generator needs to be most efficient at high load rates, and its fuel economy is closely related to the load rate. However, in actual applications, the power load often does not continue to operate at the generator's optimal efficiency point. Most power loads exhibit periodic characteristics, and load fluctuations make it impossible for the generator to stably operate at the most efficient point. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a generator energy storage coordinated control method, which solves the problems of low power supply efficiency, high fuel consumption and load fluctuations of traditional generators that cause the generators to be unable to stably operate at the optimal efficiency point.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A generator energy storage coordinated control method comprises the following steps:

[0006] S1. Collect the real-time power of the power load and determine the load status through the coordination controller;

[0007] S2. Select the working mode according to the load status and the power status of the battery system, and execute the following coordinated control method:

[0008] S2.1. Light load state: When the load power is low, the coordination controller controls the generator system to operate at the optimal efficiency point, supplies power to the distribution bus through the circuit breaker, and charges the battery system through the energy storage inverter;

[0009] S2.2. General load state: When the load power is moderate, the coordination controller controls the generator system to supply power to the power load through the circuit breaker alone, and stops the charging and discharging operation of the energy storage inverter;

[0010] S2.3. Heavy load state: When the load power is high, the coordination controller performs operation judgment according to the power state of the battery system;

[0011] S3. Dynamically switch between light load, normal load and heavy load states based on real-time information.

[0012] Preferably, the operation judgment performed in step S2.3 includes:

[0013] If the battery system has sufficient power, the generator system is controlled to supply power to the power load through the circuit breaker and the battery system;

[0014] If the battery system is low on power, non-critical loads will be cut off, leaving only critical loads powered, and an alarm signal will be sent out through the coordination controller to alert the operation and maintenance personnel.

[0015] Preferably, in step S1, the coordination controller collects real-time power data of the power load through the electric meter, and divides the load into light load, general load and heavy load according to the calculated load rate, wherein the classification threshold of the load rate is jointly determined by the efficiency curve of the generator system and the charging and discharging efficiency of the battery system.

[0016] Preferably, in step S2.3, when the battery system is low on power, the coordination controller cuts off non-important loads through hard contacts, leaving only important loads powered.

[0017] Preferably, in step S2.3, when the generator system and the battery system jointly supply power to the electrical load under heavy load conditions, the battery system provides electrical energy through a constant voltage output mode of the energy storage inverter.

[0018] Preferably, in step S3, the coordination controller dynamically adjusts the start / stop state of the generator system and the opening / closing state of the circuit breaker through the communication module according to the battery power state of the battery system and the real-time load power, so as to switch among the three working modes.

[0019] Preferably, in step S2.2, the coordination controller monitors the load power fluctuation under the general load state, and switches to step S2.1 when the load power decreases to the light load state threshold;

[0020] When the load power increases to the heavy load state threshold, switch to step S2.3.

[0021] Preferably, in step S2.1, when the generator system charges the battery system, the energy storage inverter operates in a constant power charging mode.

[0022] A generator energy storage coordination control system, comprising:

[0023] a generator system for providing electrical output;

[0024] A battery system, including a battery pack and an energy storage inverter, wherein the DC side of the energy storage inverter is connected to the battery pack, and the AC side is connected to the distribution bus, for controlling the charging and discharging of the battery;

[0025] The power distribution system includes a distribution bus, a circuit breaker and an electric meter. The distribution bus is used to connect the generator system, the battery system and the power load. The circuit breaker is used to control the electrical connection between the generator system and the distribution bus. The electric meter is used to collect the real-time power of the power load.

[0026] The coordination controller is used to collect the power data, load status and battery system power status of the system, and control the working status of the generator system, battery system and circuit breaker according to the logic of steps S1 to S3.

[0027] Preferably, the coordination controller exchanges data with the generator system, energy storage inverter, circuit breaker and electric meter through the communication module, and adjusts the system operation mode according to the real-time monitoring data, including the start and stop of the generator, the charging and discharging mode of the battery system and the opening and closing status of the circuit breaker.

[0028] The present invention provides a generator energy storage coordinated control method, which has the following beneficial effects:

[0029] 1. The present invention uses a coordinated controller to intelligently adjust the operating state of the generator, so that the generator always operates close to its optimal efficiency point. Under light load conditions, the system uses excess generator output power to charge the energy storage system, avoiding fuel waste caused by inefficient operation; under heavy load conditions, the energy storage system and the generator work together to supply power, reducing the risk of overload operation of the generator. Overall, this collaborative control method effectively improves the fuel economy of the generator, extends the equipment life, and reduces maintenance costs.

[0030] 2. The present invention dynamically switches the system's operating mode according to the real-time monitored load status, realizes flexible power allocation between light load, general load and heavy load, coordinates the controller to monitor the load power and energy storage capacity in real time, and can respond quickly when the working conditions change to ensure stable system operation.

[0031] 3. The present invention utilizes the peak-shaving and valley-filling function of the energy storage system. The present invention fully utilizes the excess electric energy output by the generator and stores it in the battery for subsequent use. This not only reduces energy waste, but also optimizes the overall power supply efficiency through timely discharge of the energy storage system.

[0032] 4. The present invention dynamically adjusts the system operation mode by exchanging real-time data with the communication modules of the generator, energy storage system, circuit breaker and electric meter. Its intelligent control logic makes the system easy to integrate and expand, and can quickly adapt to different system architectures or new equipment, while reducing the complexity of operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the method steps of the present invention;

[0034] Figure 2 It is a schematic diagram of the system architecture connection of the present invention.

[0035] Among them, 1. Generator system; 2. Circuit breaker; 3. Battery system; 4. Energy storage inverter; 5. Coordination controller; 6. Busbar; 7. Electricity meter; 8. Power load. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example:

[0038] Please see attached Figure 1 -Attached Figure 2 The embodiment of the present invention provides a generator energy storage coordination control method, especially applied to the power distribution architecture in which the generator and the battery system 3 operate in coordination, aiming to achieve an efficient and economical power supply mode through real-time monitoring and intelligent regulation of the generator, the battery system 3 and the load status by the coordination controller. The technical solution of the present invention not only solves the problem of low efficiency of traditional generators under unstable load conditions, but also combines energy storage technology and intelligent coordination control logic to enable the system to dynamically adapt to load changes and achieve the purpose of energy saving.

[0039] The control method of the present invention comprises the following steps: collecting real-time load data and judging the load state, determining the system working mode based on the load state, and coordinating and controlling the generator and the battery system 3 to achieve optimal power supply efficiency and economy. The following is a detailed description of each technical step and working condition conversion logic of the present invention in conjunction with a specific implementation method.

[0040] In this embodiment, the coordination controller 5 collects real-time power data of the power load 8 connected to the bus 6 through the electric meter 7, and analyzes the total power to determine the load state. The coordination controller 5 selects the corresponding working mode based on the load state and the power of the battery system 3, including the following five typical scenarios and their conversions:

[0041] In the first scenario, operating condition 1, the load is light and the energy storage capacity is insufficient. At this time, the generator system 1 starts, supplies power to the bus 6 through the circuit breaker 2, and charges the battery system 3 with excess power through the energy storage inverter 4. The coordination controller 5 controls the generator system to operate at a high efficiency point to ensure that the load is powered while increasing the capacity of the battery system 3. When the battery system 3 is fully charged, the coordination controller 5 monitors that the load is still in a light load state and switches to operating condition 2.

[0042] In the second scenario, operating condition 2, the load is light and the energy storage power is sufficient. At this time, the generator system 1 stops running, the circuit breaker 2 is disconnected, and the energy storage inverter 4 switches to the off-grid power supply mode, and the load is powered only by the battery system 3. When the coordination controller 5 monitors that the battery system 3 is discharged to a lower power value, the generator system 1 starts again, supplies power to the bus 6 through the circuit breaker 2, and controls the energy storage inverter 4 to switch to the charging mode, and then returns to operating condition 1.

[0043] In the third scenario, working condition 3, the load is in a normal state, and the coordination controller 5 determines that the charging and discharging efficiency of the battery system 3 is low and is not suitable for charging or discharging. At this time, only the generator system 1 supplies power to the load through the circuit breaker 2, and the battery system 3 remains stationary. When the coordination controller 5 monitors that the load is reduced to a light load state, the system switches back to working condition 1; if the load continues to increase to a heavy load state and the energy storage capacity is sufficient, it switches to working condition 4.

[0044] In the fourth scenario, working condition 4, the load is heavy and the energy storage capacity is sufficient, and the generator alone cannot meet the load demand. The coordination controller 5 controls the generator system 1 and the battery system 3 to jointly power the load. The generator system 1 provides the main power through the circuit breaker 2, and the energy storage inverter 4 provides auxiliary power to the load in a constant voltage mode. At the same time, the coordination controller 5 sends an alarm signal to remind the operation and maintenance personnel that the system is in a high load state. When the battery system 3 is exhausted, the system switches to working condition 5.

[0045] In the fifth scenario, operating condition 5, the load is heavy and the energy storage capacity is insufficient. The coordination controller 5 cuts off non-important loads through hard contacts, leaving only important loads powered. At this time, the generator system 1 operates at the maximum output power state to provide power for important loads. At the same time, the coordination controller 5 sends an alarm signal to indicate that there is a potential risk in the system. When the load is reduced to a normal state and the battery system 3 recovers its charging capacity, the system switches back to operating condition 3.

[0046] It should be noted that the conversion logic between the above working conditions is dynamically triggered by the coordinated controller 5 to monitor the load power, the power of the battery system 3 and the operating status of the generator in real time. For example, when switching from working condition 1 to working condition 2, the trigger condition is that the battery system 3 reaches the set full power value and the load remains in the light load range; when switching from working condition 2 back to working condition 1, it is necessary to monitor that the energy storage power is lower than the set value and ensure that the generator system 1 has been started and successfully connected to the grid.

[0047] In some embodiments, to improve system flexibility, the battery system 3 can be expanded to use other energy storage technologies, such as supercapacitor energy storage or flywheel energy storage. These technologies can adapt to different load characteristics. For example, supercapacitors are suitable for short-term high load fluctuations, while flywheel energy storage is suitable for smoothing periodic loads.

[0048] Specifically, the coordinated control method of the present invention is applicable to remote areas, off-grid scenarios, and environments with unstable mains power supply. For example, in a remote construction site, when only relying on diesel generators for power supply, by introducing the battery system 3, the fuel consumption when the generator is running at low efficiency can be significantly reduced; in the scenario of new energy access, the present invention can also improve the energy utilization rate of the entire system through the peak-shaving and valley-filling characteristics of the battery system 3.

[0049] In summary, the present invention combines the generator system 1 with the battery system 3 through the intelligent control of the coordination controller 5, fully utilizes the efficiency characteristics of the generator and the multi-operating condition adaptability of the battery system 3, and provides an efficient and economical power supply solution.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A generator energy storage coordinated control method, characterized in that: The following steps are involved: S1. Collecting the real-time power of the power load (8) and determining the load status through the coordination controller (5); S2. Select the working mode according to the load state and the power state of the battery system (3), and execute the following coordinated control method: S2.

1. Light load state: When the load power is low, the coordination controller (5) controls the generator system (1) to operate at the optimal efficiency point, supplies power to the distribution bus (6) through the circuit breaker (2), and charges the battery system (3) through the energy storage inverter (4); S2.

2. General load state: When the load power is moderate, the coordination controller (5) controls the generator system (1) to supply power to the power load (8) alone through the circuit breaker (2), and stops the charging and discharging operation of the energy storage inverter (4); S2.

3. Heavy load state: When the load power is high, the coordination controller (5) performs operation judgment according to the power state of the battery system (3); S3. Dynamically switch between light load, normal load and heavy load states based on real-time information.

2. A generator energy storage coordinated control method according to claim 1, characterized in that: The operation judgment performed in step S2.3 includes: When the battery system (3) has sufficient power, the generator system (1) is controlled to supply power to the power load (8) through the circuit breaker (2) and the battery system (3); When the battery system (3) is low on power, non-important loads are cut off, and only important loads are powered, and an alarm signal is sent through the coordination controller (5) to alert the operation and maintenance personnel.

3. A generator energy storage coordinated control method according to claim 1, characterized in that: In step S1, the coordination controller (5) collects real-time power data of the power load (8) through the electric meter (7), and divides the load into light load, general load and heavy load according to the calculated load rate, wherein the classification threshold of the load rate is jointly determined by the efficiency curve of the generator system (1) and the charging and discharging efficiency of the battery system (3).

4. A generator energy storage coordinated control method according to claim 1, characterized in that: In step S2.3, when the battery system (3) is low on power, the coordination controller (5) cuts off non-critical loads through hard contacts, leaving only critical loads powered.

5. A generator energy storage coordinated control method according to claim 1, characterized in that: In the step S2.3, when the generator system (1) and the battery system (3) jointly supply power to the power load (8) under heavy load conditions, the battery system (3) provides electrical energy through the constant voltage output mode of the energy storage inverter (4).

6. A generator energy storage coordinated control method according to claim 1, characterized in that: In step S3, the coordination controller (5) dynamically adjusts the start / stop state of the generator system (1) and the opening / closing state of the circuit breaker (2) through the communication module according to the battery power state of the battery system (3) and the real-time load power, thereby realizing the switching of the three working modes.

7. A generator energy storage coordinated control method according to claim 1, characterized in that: In step S2.2, the coordination controller (5) monitors the load power fluctuation under the normal load state, and switches to step S2.1 when the load power decreases to the light load state threshold; When the load power increases to the heavy load state threshold, switch to step S2.

3.

8. A generator energy storage coordinated control method according to claim 1, characterized in that: In step S2.1, when the generator system (1) charges the battery system (3), the energy storage inverter (4) operates in a constant power charging mode.

9. A generator energy storage coordinated control system, according to a generator energy storage coordinated control method according to any one of claims 1 to 8, characterized in that: include: A generator system (1) for providing electrical output; A battery system comprises a battery pack (3) and an energy storage inverter (4), wherein the DC side of the energy storage inverter (4) is connected to the battery pack (3), and the AC side is connected to a power distribution bus (6), and is used to control the charging and discharging of the battery; A power distribution system, comprising a power distribution bus (6), a circuit breaker (2) and an electric meter (7), wherein the power distribution bus (6) is used to connect a generator system (1), a battery system and an electric load (8), the circuit breaker (2) is used to control the electrical connection between the generator system (1) and the power distribution bus (6), and the electric meter (7) is used to collect real-time power of the electric load (8); The coordination controller (5) is used to collect the power data, load status and battery system power status of the system, and control the working status of the generator system (1), the battery system and the circuit breaker (2) according to the logic of steps S1 to S3.

10. A generator energy storage coordination control system according to claim 9, characterized in that: The coordination controller (5) exchanges data with the generator system (1), the energy storage inverter (4), the circuit breaker (2) and the electric meter (7) through the communication module, and adjusts the system operation mode according to the real-time monitoring data, including the start and stop of the generator, the charging and discharging mode of the battery system (3) and the opening and closing state of the circuit breaker (2).

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