Diesel engine and energy storage box hybrid power supply system and power supply method thereof

Abstract

The invention relates to a diesel engine and energy storage box hybrid power supply system and a power supply method thereof. The system is formed by connecting a diesel engine, a first energy storage part, a second energy storage part, a converter set, a photovoltaic source and a load. The power supply method comprises the following steps: judging a load working period; judging whether the power grid has electricity or not and adopting a scheme for ending or judging the total energy storage power SOC of the first energy storage part and the second energy storage part and adopting a scheme for ending or carrying out next judgment; and judging whether the mains supply has electricity or not, and ending the scheme. According to the diesel engine and energy storage box hybrid power supply system and the power supply method provided by the invention, the defect of long-time operation of the diesel engine can be overcome according to existence of a power grid and commercial power and stored energy identification, energy storage and discharge are preferentially carried out, charging is carried out when the stored energy is discharged to a certain capacity, shutdown is not needed when charging is carried out, and a standby state is entered; and the power of the diesel engine is reduced while the power of each kilowatt-hour is not wasted, and the exhaust emission and the noise are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power engineering, and in particular to a system for hybrid power supply of a diesel engine and an energy storage box and a power supply method thereof. Background Art

[0002] In daily life, we often encounter situations where there is no mains electricity but electricity is needed. Diesel generators are commonly used to solve this problem, and energy storage cabinets are also used to solve this problem. However, the existing method of using generators to solve this problem has certain disadvantages: the generator set needs to be equipped according to the maximum load of on-site electricity consumption, but this large load is used for a relatively short time, and most of the time it will be running with a small power load, or even no load. This requires the generator set to be running at all times. The greater the power of the diesel engine, the greater the fuel consumption and the more exhaust gas it emits. In this way, a lot of electricity generated by the generator set is actually wasted, and it will also cause exhaust gas emissions and noise that affect the environment. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a diesel engine and energy storage box hybrid power supply system and a power supply method thereof, so as to solve one or more problems in the prior art.

[0004] To achieve the above object, the technical solution of the present invention is as follows: A diesel engine and energy storage box hybrid power supply system, the system is composed of a diesel engine, a first energy storage component, a second energy storage component, a converter group, a photovoltaic source and a load connected to each other.

[0005] Furthermore, the converter group includes a first converter and a second converter, a portion of the photovoltaic source is electrically connected to the load, and a portion of the photovoltaic source is electrically connected to the first energy storage component and the second energy storage component via the first converter and the second converter, respectively.

[0006] Furthermore, the converter group also includes a third converter and a fourth converter, a part of the diesel engine is electrically connected to the load, and a part of the diesel engine is electrically connected to the first energy storage component and the second energy storage component respectively through the third converter and the fourth converter.

[0007] Furthermore, the first energy storage component and the second energy storage component are both electrically connected to the load.

[0008] A power supply method, which is applied to the above-mentioned system of hybrid power supply of a diesel engine and an energy storage box, comprises the following steps: Determination of load working period; Determine whether the grid has electricity and adopt a solution to end, or determine the total energy storage SOC of the first energy storage component and the second energy storage component and adopt a solution to end or proceed to the next step of determination; Determine whether the city power is available and adopt a solution to end the process.

[0009] Furthermore, for the determination of the load working period, if it is in the working period, whether the grid has electricity is determined; if it is not in the working period, the total energy storage capacity SOC of the first energy storage component and the second energy storage component is determined.

[0010] Furthermore, it is determined whether there is electricity in the power grid. If there is electricity in the power grid, the load is powered by the mains, the photovoltaic source, the first energy storage component, and the second energy storage component; if there is no electricity in the power grid, the load is powered by the photovoltaic source, the first energy storage component, and the second energy storage component.

[0011] Furthermore, the total energy storage capacity SOC of the first energy storage component and the second energy storage component is determined. If the total energy storage capacity is not less than 95%, the system enters the standby state; if the total energy storage capacity is less than 95%, it is determined whether the mains power is available.

[0012] Furthermore, it is determined whether there is electricity in the mains. If there is electricity, the first energy storage component and the second energy storage component are charged by the mains; if there is no electricity, the first energy storage component and the second energy storage component are charged by the diesel engine.

[0013] Compared with the prior art, the beneficial technical effects of the present invention are as follows: The present invention provides a system and a power supply method for hybrid power supply of a diesel engine and an energy storage box, which can overcome the disadvantage of long-term operation of the diesel engine according to the presence or absence of a power grid and a city power supply and the identification of the stored energy, give priority to energy storage discharge, and charge when the energy storage is discharged to a certain capacity without stopping the machine for charging and entering a standby state. The present invention reduces the power of the diesel engine that needs to be provided, and at the same time the diesel engine charges the first energy storage component and the second energy storage component to ensure that every kilowatt-hour of electricity is not wasted. In addition, the power of the diesel engine is reduced, and exhaust emissions and noise are also reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the structure of a system for hybrid power supply of a diesel engine and an energy storage box according to an embodiment of the present invention is shown.

[0015] Figure 2 A flow chart of a power supply method for hybrid power supply of a diesel engine and an energy storage box according to an embodiment of the present invention is shown.

[0016] Markings in the attached drawings: 1. diesel engine; 2. first energy storage component; 3. second energy storage component; 4. converter group; 401. first converter; 402. second converter; 403. third converter; 404. fourth converter; 5. photovoltaic source; 6. load. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the present invention clearer, the following is a further detailed description of a diesel engine and energy storage box hybrid power supply system and its power supply method proposed by the present invention in combination with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification, so that people familiar with this technology can understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0018] See also Figure 1 The diesel engine and energy storage box hybrid power supply system of this embodiment is composed of a diesel engine 1, a first energy storage component 2, a second energy storage component 3, a converter group 4, a photovoltaic source 5 and a load 6 connected to each other. Preferably, in this embodiment, the first energy storage component 2 and the second energy storage component 3 are both energy storage modules with the same capacity of 215kWh, and the power of the diesel engine 1 is 65kW.

[0019] Further, the converter group 4 includes a first converter 401 and a second converter 402, a portion of the photovoltaic source 5 is electrically connected to the load 6 to supply power to the load 6, and a portion of the photovoltaic source 5 is electrically connected to the first energy storage component 2 and the second energy storage component 3 via the first converter 401 and the second converter 402, respectively, and can also charge the first energy storage component 2 and the second energy storage component 3. In this embodiment, when the photovoltaic source 5 and the first energy storage component 2 and the second energy storage component 3 are supplying power, that is, the first converter 401 and the second converter 402 both use energy storage converters with a power of 240 kW.

[0020] Furthermore, the converter group 4 also includes a third converter 403 and a fourth converter 404, a part of the diesel engine 1 is electrically connected to the load 6 to supply power to the load 6, and a part of the diesel engine 1 is electrically connected to the first energy storage component 2 and the second energy storage component 3 via the third converter 403 and the fourth converter 404, respectively, and can also charge the first energy storage component 2 and the second energy storage component 3.

[0021] Further, the first energy storage component 2 and the second energy storage component 3 are both electrically connected to the load 6 to supply power to the load 6. In this embodiment, when the diesel engine 1 supplies power to the first energy storage component 2 and the second energy storage component 3 or when the first energy storage component 2 and the second energy storage component 3 supply power to the load 6, the third converter 403 and the fourth converter 404 both use energy storage converters with a power of 80 kW.

[0022] A power supply method of this embodiment is applied to the above-mentioned system of hybrid power supply of a diesel engine and an energy storage box, and comprises the following steps: Step 1: Determine the working period of load 6.

[0023] According to the working scenario, the time period can be divided into load 6 working period and load 6 non-working period.

[0024] Step 2: Determine whether the grid has electricity and adopt a solution to end or determine the total energy storage capacity SOC of the first energy storage component 2 and the second energy storage component 3 and adopt a solution to end or proceed to the next step of determination.

[0025] If the load 6 in step 1 is in the working period, whether the grid has electricity is determined; if it is not in the working period, the total energy storage SOC of the first energy storage component 2 and the second energy storage component 3 is determined.

[0026] Furthermore, it is determined whether there is electricity in the power grid. If there is electricity in the power grid, the load 6 is powered by the mains, the photovoltaic source 5, the first energy storage component 2, and the second energy storage component 3, and the task is completed. If there is no electricity in the power grid, the load 6 is powered by the photovoltaic source 5, the first energy storage component 2, and the second energy storage component 3, and the task is completed.

[0027] Furthermore, the total energy storage capacity SOC of the first energy storage component 2 and the second energy storage component 3 is determined. If the total energy storage capacity is not less than 95%, the system enters the standby state and ends the task. If the total energy storage capacity is less than 95%, it is determined whether the mains power is available.

[0028] Step 3: Determine whether the city power supply is available and adopt a solution to end.

[0029] It is judged whether there is electricity in the mains. If there is electricity, the first energy storage component 2 and the second energy storage component 3 are charged by the mains and the task is completed. If there is no electricity, the first energy storage component 2 and the second energy storage component 3 are charged by the diesel engine 1 and the task is completed.

[0030] The technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. The above-described embodiments only express several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, several variations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A diesel engine and energy storage box hybrid power supply system, characterized in that: The system is composed of a diesel engine, a first energy storage component, a second energy storage component, a converter group, a photovoltaic source and a load which are connected to each other.

2. A diesel engine and energy storage box hybrid power supply system as claimed in claim 1, characterized in that: The converter group includes a first converter and a second converter. A portion of the photovoltaic source is electrically connected to the load, and a portion of the photovoltaic source is electrically connected to the first energy storage component and the second energy storage component via the first converter and the second converter, respectively.

3. A diesel engine and energy storage box hybrid power supply system as claimed in claim 2, characterized in that: The converter group further includes a third converter and a fourth converter. A portion of the diesel engine is electrically connected to the load, and a portion of the diesel engine is electrically connected to the first energy storage component and the second energy storage component respectively via the third converter and the fourth converter.

4. A diesel engine and energy storage box hybrid power supply system as claimed in claim 3, characterized in that: The first energy storage component and the second energy storage component are both electrically connected to the load.

5. A power supply method, the power supply method being applied to a diesel engine and energy storage box hybrid power supply system as claimed in any one of claims 1 to 4, characterized in that: The steps include: Determination of load working period; Determine whether the grid has electricity and adopt a solution to end, or determine the total energy storage SOC of the first energy storage component and the second energy storage component and adopt a solution to end or proceed to the next step of determination; Determine whether the city power is available and adopt a solution to end the process.

6. A power supply method according to claim 5, characterized in that: Regarding the determination of the load working period, if it is in the working period, whether the grid has electricity is determined; if it is not in the working period, the total energy storage SOC of the first energy storage component and the second energy storage component is determined.

7. A power supply method according to claim 6, characterized in that: It is determined whether there is electricity in the power grid. If there is electricity in the power grid, the load is powered by the mains, the photovoltaic source, the first energy storage component, and the second energy storage component; if there is no electricity in the power grid, the load is powered by the photovoltaic source, the first energy storage component, and the second energy storage component.

8. A power supply method according to claim 7, characterized in that: Determine the total energy storage capacity SOC of the first energy storage component and the second energy storage component. If the total energy storage capacity is not less than 95%, the system enters a standby state. If the total energy storage capacity is less than 95%, it is necessary to determine whether the mains power is available.

9. A power supply method according to claim 8, characterized in that: It is judged whether there is electricity in the mains. If there is electricity, the first energy storage component and the second energy storage component are charged by the mains; if there is no electricity, the first energy storage component and the second energy storage component are charged by the diesel engine.

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