Energy-saving electric power system

Abstract

The utility model discloses an energy-saving electric power system, and relates to the technical field of electric power supply systems. The energy-saving electric power system comprises a diesel generating set, a lithium battery energy storage device, a monitoring unit and a parallel controller. The diesel generator set serves as a first power supply of the load; the lithium battery energy storage device is connected with the diesel generating set in parallel and serves as a second power supply of the load. The monitoring unit comprises a first monitoring unit and a second monitoring unit, and the first monitoring unit is electrically connected with the diesel generating set and used for monitoring the power generation state of the diesel generating set; the second monitoring unit is electrically connected with the load and is used for monitoring the power demand of the load. The parallel controller is in communication connection with the diesel generating set, the monitoring unit and the lithium battery energy storage device. By adopting the technology provided by the utility model, the generated power of the diesel generator set is always in an optimal strategy, so that the oil consumption of the diesel generator is reduced, and the emission of pollutants is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply systems, in particular to an energy-saving power system. Background Art

[0002] In the process of power storage and power generation, in order to cope with the fluctuation of power demand and ensure the stable operation of the power system, diesel generators are usually used as auxiliary power supply units to provide electricity. However, due to the weak anti-interference ability of diesel generators and their easy emission of pollutants (such as sulfur dioxide) during continuous power generation, it is difficult to meet the current increasingly high energy efficiency and environmental protection requirements.

[0003] Based on this, the current common practice is to add energy-saving measures to the basic equipment of diesel generators, such as improving the combustion efficiency of diesel generators, using low-sulfur fuels with higher cleanliness, etc. However, the above methods have limited energy-saving effects on diesel generators, but have greatly increased the cost of using diesel generators and cannot meet the stable operation of the power system. Utility Model Content

[0004] The utility model provides an energy-saving electric power system to solve the problem that the energy-saving measures of the diesel generator in the prior art are limited and cannot meet the requirement of stable electric power supply.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is to provide an energy-saving power system, which includes: a diesel generator set, a lithium battery energy storage device, a monitoring unit and a parallel controller.

[0006] The diesel generator set includes at least one diesel generator, and the diesel generator set serves as the first power supply for the load; the lithium battery energy storage device is connected in parallel with the diesel generator set and serves as the second power supply for the load.

[0007] The monitoring unit includes a first monitoring unit and a second monitoring unit. The first monitoring unit is electrically connected to the diesel generator set and used to monitor the power generation status of the diesel generator set; the second monitoring unit is electrically connected to the load and used to monitor the power demand of the load.

[0008] The parallel controller is communicatively connected to the diesel generator set, the monitoring unit and the lithium battery energy storage device respectively, wherein the parallel controller has a current distribution unit, and the current distribution unit can distribute the power supply ratio of the first power supply source and the second power supply source.

[0009] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0010] As an energy storage medium, lithium batteries have the advantages of high energy density, long cycle life and fast charging. By connecting the lithium battery energy storage device in parallel with the diesel generator, it can be used as the second power supply to supply power to the load, to make up for the problem of insufficient or unstable power supply when the diesel generator set is the first power supply during peak power consumption.

[0011] The parallel controller is a device used to control the parallel operation of multiple diesel generators, which can ensure the power distribution and synchronization between diesel generator sets. It is applied to diesel generator sets and lithium battery energy storage devices, and the power supply ratio of the first power supply and the second power supply is allocated through the current distribution unit it has.

[0012] In addition, a first monitoring unit is provided to monitor the power generation status of the diesel generator, including the operating status of the diesel generator set; a second monitoring unit is provided to obtain the power demand of the load in real time. Thus, the parallel controller can automatically adjust the power output of the lithium battery energy storage device and the diesel generator set. That is, it ensures that the first power supply source and the second power supply source are always in the best power supply mode, and the power generation power of the diesel generator set is always in the best strategy, thereby reducing the fuel consumption of the diesel generator and reducing the emission of pollutants.

[0013] In some embodiments, the energy-saving power system also includes a first circuit breaker, a second circuit breaker and a third circuit breaker, the first circuit breaker is electrically connected to the diesel generator set and is located between the first monitoring unit and the diesel generator set; the second circuit breaker is electrically connected to the lithium battery energy device, and the first circuit breaker and the second circuit breaker are connected in parallel; the third circuit breaker is electrically connected to the load and is located between the second monitoring unit and the load.

[0014] By adopting the above technical solution, the first circuit breaker, the second circuit breaker and the third circuit breaker are arranged so that each unit has an independent circuit breaker, which can cut off the current in time when the circuit is short-circuited, overloaded or other abnormal situations occur, thereby accurately cutting off the problem circuit to protect the electrical equipment in the circuit. In addition, when the diesel generator set fails, the lithium battery energy storage device can serve as a backup circuit to ensure the normal power consumption of the load, and vice versa.

[0015] In some embodiments, the lithium battery energy storage device includes an energy storage AC and a lithium battery pack, wherein the energy storage AC is located between the lithium battery pack and the load, wherein the energy storage AC is communicatively connected to the parallel controller.

[0016] By adopting the above technical solution, the energy storage AC device is used to control the charging and discharging process of the lithium battery and can convert direct current into alternating current. An energy storage AC device is added to the lithium battery energy storage device so that the lithium battery can serve as the second power supply for the load.

[0017] In some embodiments, the second circuit breaker is located between the energy storage AC device and the load, so that the second power supply source can be directly cut off when the second circuit breaker is powered off.

[0018] In some embodiments, the energy storage alternator is communicatively connected to the parallel controller via the Modbus TCP industrial communication protocol.

[0019] Using the above technical solution, Modbus TCP is a Modbus protocol version based on Ethernet, which does not require any dedicated hardware or communication interface. Therefore, using Modbus TCP as the protocol version between the energy storage AC and the parallel controller can have a higher communication rate, so as to obtain information such as the remaining power of the lithium battery in a timely manner.

[0020] In some embodiments, the diesel generator set and the lithium battery energy storage device are respectively connected to the load via an AC bus, and the AC bus is used to transmit electrical energy from the diesel generator set and / or the lithium battery energy storage device to the load.

[0021] By adopting the above technical solution, the diesel generator set and the lithium battery energy storage device are connected to the load through the AC bus, which can realize efficient transmission and distribution of electric energy. It can ensure that the load can still obtain stable power supply even when the first power supply source is unavailable.

[0022] In some embodiments, the first monitoring unit includes a first current transformer and an ammeter, wherein the high voltage side of the first current transformer is electrically connected to the output end of the diesel generator set, and the low voltage side of the first current transformer is electrically connected to the ammeter; the ammeter is located between the first current transformer and the load. The first current transformer and the ammeter cooperate with each other to obtain the current output of the diesel generator set in a timely manner.

[0023] In some embodiments, the second monitoring unit includes a second current transformer, an electric energy meter and a temperature and humidity sensor, the second current transformer is electrically connected to the electric energy meter, wherein the electric energy meter is located between the current transformer and the load, and the temperature and humidity sensor is communicatively connected to the parallel controller and is used to detect the temperature and humidity of the environment in which the load is located.

[0024] By adopting the above technical solution, the power demand of the load is obtained by connecting the second current transformer in series with the electric energy meter. Compared with the current method of only setting up one electric energy meter, adding the second current transformer can effectively expand the metering capacity of the electric energy meter.

[0025] In some embodiments, the first monitoring unit and the second monitoring unit are communicatively connected to the parallel controller via RS485 serial standard; and the lithium battery energy storage device is communicatively connected to the parallel controller via RS485 serial standard.

[0026] With the above technical solution, RS485 is a serial communication interface standard with a long transmission distance and strong anti-interference ability. Using it as the transmission standard of the first monitoring unit and the second monitoring unit can make it applicable to more monitoring elements, so that corresponding monitoring elements can be added in some application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work, among which:

[0028] Figure 1 This is a circuit connection diagram of an embodiment of an energy-saving power system provided by the utility model;

[0029] Figure 2 It is a connection block diagram of an embodiment of an energy-saving power system provided by the utility model.

[0030] In the figure:

[0031] Diesel generator set—10; First circuit breaker—11;

[0032] Lithium battery energy storage device—20; second circuit breaker—21; energy storage AC device—22; lithium battery pack—23;

[0033] Monitoring unit—30; first monitoring unit—31; first current transformer—310; ammeter—311; second monitoring unit—32; second current transformer—320; electric energy meter—321; temperature and humidity sensor—322;

[0034] Parallel controller—40; current distribution unit—41;

[0035] Load—50; third circuit breaker—51; AC bus—52. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0037] See also Figure 1 As shown, Figure 1 A circuit connection diagram of an embodiment of an energy-saving power system provided by the present application is shown.

[0038] In some embodiments, the energy-saving power system includes: a diesel generator set 10, a lithium battery energy storage device 20, a monitoring unit 30 and a parallel controller 40.

[0039] The diesel generator set 10 includes at least one diesel generator, and the diesel generator set 10 serves as a first power supply for the load 50 ; the lithium battery energy storage device 20 is connected in parallel with the diesel generator set 10 and serves as a second power supply for the load 50 .

[0040] The monitoring unit 30 includes a first monitoring unit 31 and a second monitoring unit 32. The first monitoring unit 31 is electrically connected to the diesel generator set 10 and is used to monitor the power generation status of the diesel generator set 10; the second monitoring unit 32 is electrically connected to the load 50 and is used to monitor the power demand of the load 50.

[0041] The parallel controller 40 is respectively connected to the diesel generator set 10, the monitoring unit 30 and the lithium battery energy storage device 20 for communication, wherein the parallel controller 40 has a current distribution unit 41, which can distribute the power supply ratio of the first power supply and the second power supply.

[0042] In the embodiment of the present application, lithium batteries are used as energy storage media, which have the advantages of high energy density, long cycle life and fast charging. By connecting the lithium battery energy storage device 20 in parallel with the diesel generator, it can be used as a second power supply to supply power to the load 50, so as to make up for the problem of insufficient power supply or unstable power supply when the diesel generator set 10 is used as the first power supply during peak power consumption. For example, the diesel generator set 10 can be provided with multiple interconnected diesel generators to achieve a more sufficient power supply.

[0043] Among them, the parallel controller 40 is a device for controlling the parallel operation of multiple diesel generators, which can ensure the power distribution and synchronization between the diesel generator sets 10. It is applied to the diesel generator set 10 and the lithium battery energy storage device 20, and the power supply ratio of the first power supply source and the second power supply source is distributed through the current distribution unit 41 it has. Exemplarily, the parallel controller 40 is currently a circuit for controlling multiple motors or actuators. When it is applied to the power generation system, it can cooperate with the current distribution unit 41 to realize the current distribution ratio of the two current supply sources of the lithium battery energy storage device 20 and the diesel generator set 10 to supply the load. For example, the parallel controller 40 includes input terminals, output terminals, and control switches to distribute the current.

[0044] In addition, a first monitoring unit 31 is provided to monitor the power generation state of the diesel generator, including the operating state of the diesel generator set 10; a second monitoring unit 32 is provided to obtain the power demand of the load 50 in real time. Thus, the parallel controller 40 can automatically adjust the power output of the lithium battery energy storage device 20 and the diesel generator set 10. That is, it is ensured that the first power supply source and the second power supply source are always in the best power supply mode, and the power generation power of the diesel generator set is always in the best strategy, thereby reducing the fuel consumption of the diesel generator and reducing the emission of pollutants.

[0045] In some embodiments, the diesel generator set 10 and the lithium battery energy storage device 20 are respectively connected to the load 50 via an AC bus 52 , and the AC bus 52 is used to transmit the electric energy of the diesel generator set 10 and / or the lithium battery energy storage device 20 to the load 50 .

[0046] In the embodiment of the present application, the diesel generator set 10 and the lithium battery energy storage device 20 are connected to the load 50 via the AC bus 52, so that efficient transmission and distribution of electric energy can be achieved. This can ensure that even when the first power supply source is unavailable, the load 50 can still obtain a stable power supply.

[0047] Combination Figure 2 As shown, Figure 2 A connection block diagram of an embodiment of an energy-saving power system provided by the present application is shown.

[0048] In some embodiments, the energy-saving power system also includes a first circuit breaker 11, a second circuit breaker 21 and a third circuit breaker 51. The first circuit breaker 11 is electrically connected to the diesel generator set 10 and is located between the first monitoring unit 31 and the diesel generator set 10; the second circuit breaker 21 is electrically connected to the lithium battery energy device, and the first circuit breaker 11 and the second circuit breaker 21 are connected in parallel; the third circuit breaker 51 is electrically connected to the load 50 and is located between the second monitoring unit 32 and the load 50.

[0049] In the embodiment of the present application, the first circuit breaker 11, the second circuit breaker 21 and the third circuit breaker 51 are arranged so that each unit has an independent circuit breaker, which can cut off the current in time when an abnormal situation such as a short circuit or overload occurs in the circuit, thereby accurately cutting off the problem circuit to protect the electrical equipment in the circuit. In addition, when the diesel generator set 10 fails, the lithium battery energy storage device 20 can serve as a backup circuit to ensure the normal power consumption of the load 50, and vice versa.

[0050] In some embodiments, the lithium battery energy storage device 20 includes an energy storage AC 22 and a lithium battery pack 23 , wherein the energy storage AC 22 is located between the lithium battery pack 23 and the load 50 , wherein the energy storage AC 22 is communicatively connected to the parallel controller 40 .

[0051] In the embodiment of the present application, the energy storage AC device 22 (Power Conversion System, PCS) is used to control the charging and discharging process of the lithium battery and can convert direct current into alternating current. The energy storage AC device 22 is added to the lithium battery energy storage device 20 so that the lithium battery can be used as the second power supply for the load 50.

[0052] In some embodiments, the second circuit breaker 21 is located between the energy storage AC device 22 and the load 50. This allows the second power supply to be directly cut off when the second circuit breaker 21 is powered off. The energy storage AC device 22 is connected to the parallel controller 40 via the Modbus TCP industrial communication protocol.

[0053] Modbus TCP is a Modbus protocol version based on Ethernet, which does not require any dedicated hardware or communication interface. Therefore, using Modbus TCP as the protocol version between the energy storage AC 22 and the parallel controller 40 can have a higher communication rate, so as to obtain information such as the remaining power of the lithium battery in a timely manner.

[0054] The first monitoring unit 31 and the second monitoring unit 32 are connected to the parallel controller 40 through RS485 serial standard; the lithium battery energy storage device 20 is connected to the parallel controller 40 through RS485 serial standard.

[0055] RS485 is a serial communication interface standard with a long transmission distance and strong anti-interference ability. Using it as the transmission standard of the first monitoring unit 31 and the second monitoring unit 32 can make it applicable to more monitoring elements, so that corresponding monitoring elements can be added in some application scenarios.

[0056] In some embodiments, the first monitoring unit 31 includes a first current transformer 310 and an ammeter 311, wherein the high voltage side of the first current transformer 310 is electrically connected to the output end of the diesel generator set 10, and the low voltage side of the first current transformer 310 is electrically connected to the ammeter 311; the ammeter 311 is located between the first current transformer 310 and the load 50. The first current transformer 310 and the ammeter 311 cooperate with each other to obtain the current output of the diesel generator set 10 in a timely manner.

[0057] In some embodiments, the second monitoring unit 32 includes a second current transformer 320, an electric energy meter 321 and a temperature and humidity sensor 322, the second current transformer 320 is electrically connected to the electric energy meter 321, wherein the electric energy meter 321 is located between the current transformer and the load 50, and the temperature and humidity sensor 322 is communicatively connected to the parallel controller 40 and is used to detect the temperature and humidity of the environment in which the load 50 is located.

[0058] In the embodiment of the present application, the power demand of the load 50 is obtained by connecting the second current transformer in series with the electric energy meter 321. Compared with the current method of only setting up one electric energy meter 321, adding the second current transformer can effectively expand the metering capacity of the electric energy meter 321.

[0059] The above description is only an implementation method of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present utility model, or directly or indirectly used in other related technical fields, should be included in the protection scope of the present utility model.

Claims

1. An energy-saving power system for providing power to a load, characterized in that: include: A diesel generator set, the diesel generator set comprising at least one diesel generator, the diesel generator set serving as a first power supply source for the load; A lithium battery energy storage device, which is connected in parallel with the diesel generator set and serves as a second power supply for the load; A monitoring unit, the monitoring unit comprising a first monitoring unit and a second monitoring unit, the first monitoring unit being electrically connected to the diesel generator set and used to monitor the power generation state of the diesel generator set; the second monitoring unit being electrically connected to the load and used to monitor the power demand of the load; A parallel controller is respectively communicatively connected with the diesel generator set, the monitoring unit and the lithium battery energy storage device, wherein the parallel controller has a current distribution unit, and the current distribution unit can distribute the power supply ratio of the first power supply source and the second power supply source.

2. The energy-saving power system according to claim 1, characterized in that: The energy-saving power system also includes a first circuit breaker, a second circuit breaker and a third circuit breaker. The first circuit breaker is electrically connected to the diesel generator set and is located between the first monitoring unit and the diesel generator set; the second circuit breaker is electrically connected to the lithium battery energy device, and the first circuit breaker and the second circuit breaker are connected in parallel; the third circuit breaker is electrically connected to the load and is located between the second monitoring unit and the load.

3. The energy-saving power system according to claim 1, characterized in that: The lithium battery energy storage device includes an energy storage AC and a lithium battery pack, wherein the energy storage AC is located between the lithium battery pack and the load, wherein the energy storage AC is communicatively connected to the parallel controller.

4. The energy-saving power system according to claim 2 or 3, characterized in that: The second circuit breaker is located between the energy storage AC device and the load.

5. The energy-saving power system according to claim 3, characterized in that: The energy storage AC device is connected to the parallel controller through the Modbus TCP industrial communication protocol.

6. The energy-saving power system according to claim 1, characterized in that: The diesel generator set and the lithium battery energy storage device are respectively connected to the load via an AC bus, and the AC bus is used to transmit the electric energy of the diesel generator set and / or the lithium battery energy storage device to the load.

7. The energy-saving power system according to claim 1, characterized in that: The first monitoring unit includes a first current transformer and an ammeter, wherein the high voltage side of the first current transformer is electrically connected to the output end of the diesel generator set, and the low voltage side of the first current transformer is electrically connected to the ammeter; the ammeter is located between the first current transformer and the load.

8. The energy-saving power system according to claim 1, characterized in that: The second monitoring unit includes a second current transformer, an electric energy meter and a temperature and humidity sensor, wherein the second current transformer is electrically connected to the electric energy meter, wherein the electric energy meter is located between the current transformer and the load, and the temperature and humidity sensor is communicatively connected to the parallel controller and is used to detect the temperature and humidity of the environment in which the load is located.

9. The energy-saving power system according to claim 1, characterized in that: The first monitoring unit and the second monitoring unit are communicatively connected to the parallel controller via the RS485 serial standard.

10. The energy-saving power system according to claim 1, characterized in that: The lithium battery energy storage device is communicatively connected with the parallel controller via the RS485 serial standard.

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