Oil-electricity hybrid power supply system

Abstract

The utility model relates to the technical field of power supply, in particular to an oil-electricity hybrid power supply system, which comprises a generator set and an energy storage power supply, and the generator set and the energy storage power supply can independently supply power to a load and can also be connected in parallel to jointly supply power to the load. The energy storage power supply can be charged through the alternating current output end of the generator set, or can be charged through commercial power, alternating current charging equipment and direct current. The energy storage power supply comprises a battery pack, a bidirectional DC-DC module and a bidirectional DC-AC module which are electrically connected in sequence, the bidirectional DC-AC module is connected with an alternating current input / output end, and the alternating current output end of the generator set can be electrically connected with the alternating current input / output end of the energy storage power supply. The multi-scene power utilization requirement can be met, the use is flexible, and the applicability is wider.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, in particular to a hybrid oil-electric power supply system. Background Art

[0002] Small generators have strong outdoor load-carrying capacity and are convenient to carry, but they have high noise and high operating costs. Although energy storage power supplies have a lower endurance than small generators, they have low noise and low operating costs. Therefore, different power supply devices are required for different power consumption occasions. In the prior art, there is a technology that combines a generator set and an energy storage power supply to supply power to a load. However, its disadvantages are as follows: the energy storage power supply is charged through the DC output side of the generator set. Therefore, the energy storage power supply can only be used in combination with the generator set, or the energy storage power supply needs to be equipped with additional charging equipment for charging, with poor convenience, unable to meet the power supply requirements of multiple scenarios, with large limitations in use, and low charging efficiency. Summary of the Utility Model

[0003] The utility model aims to provide a hybrid oil-electric power supply system that is flexible to use and can meet the power consumption needs of more scenarios.

[0004] A hybrid oil-electric power supply system includes a generator set and an energy storage power supply. The generator set and the energy storage power supply are connected in parallel to jointly supply power to a load, and the generator set and the energy storage power supply can also independently supply power to the load; the energy storage power supply can be directly charged through the AC output terminal of the generator set, or charged through the mains power, AC charging equipment, direct current, etc.

[0005] The beneficial effects of the utility model are as follows: in this solution, when the energy storage power supply needs to be charged, the generator set can charge the energy storage power supply through the AC output terminal, that is, the energy storage power supply can be directly charged through AC, and the charging power can reach the rated power of the energy storage power supply or higher, with high charging efficiency. When the energy storage power supply is used separately from the generator set, the energy storage power supply can be directly charged through the mains power or AC charging equipment, so that the energy storage power supply can be used alone, and the energy storage power supply can be charged at a high AC rate, with high charging efficiency. In some special occasions (such as when it is inconvenient to perform AC charging), the energy storage power supply can also be charged with direct current. The utility model can meet the requirements of more usage scenarios. When the load is small or has a short-term load and requires a low environmental noise, the energy storage power supply can be used alone to supply power; when the load is large or has a long-term load and has no high requirements for environmental noise, the generator set can be used alone to supply power; when the load is large and the power supply demand cannot be met by using the generator set alone, the generator set and the energy storage power supply can be used together to supply power to the load.

[0006] In summary, the utility model can meet the power consumption needs of multiple scenarios, is flexible to use, and has a wide adaptability.

[0007] The preferred embodiment of the present utility model is that: the energy storage power supply includes a battery pack, a bidirectional DC-DC module and a bidirectional DC-AC module that are electrically connected in sequence. The bidirectional DC-AC module is connected with an AC input / output terminal, and the AC output terminal of the generator set can be electrically connected with the AC input / output terminal of the energy storage power supply.

[0008] The beneficial effects are as follows: In this solution, by setting a bidirectional DC-DC module and a bidirectional DC-AC module in the energy storage power supply, through this bidirectional circuit, the battery pack can not only charge the battery pack through AC, but also supply power to AC loads. Moreover, the charging rate with AC is fast, and through the cooperation of the bidirectional DC-AC and bidirectional DC-DC, the energy storage power supply can be charged at the rated power or a higher power.

[0009] The preferred embodiment of the present utility model is that: the battery pack is also connected with a DC input / output terminal.

[0010] The beneficial effects are as follows: In this solution, by setting a DC input / output terminal in the energy storage power supply, the energy storage power supply can directly supply power to DC loads and can also be charged through a DC power supply.

[0011] The preferred embodiment of the present utility model is that: the energy storage power supply can be used as the starting power supply for the engine of the generator set, supply power to the starting module of the engine, and be used to start the engine.

[0012] The beneficial effects are as follows: In this solution, when starting the engine of the generator set, the energy storage power supply can be used as the starting power supply to supply power to the starting module of the engine. Therefore, when the energy storage power supply and the generator set are used in combination, there is no need to separately set a starting power supply for the generator set, which saves costs.

[0013] The preferred embodiment of the present utility model is that: there is an installation position on the generator set, and a first plug-in end is provided on the installation position. A second plug-in end is provided on the energy storage power supply. After the second plug-in end and the first plug-in end are connected, the generator set and the energy storage power supply can jointly supply power to the load, and the generator set can also charge the energy storage power supply. When the second plug-in end and the first plug-in end are disconnected, the generator set and the energy storage power supply can supply power to the load separately.

[0014] The beneficial effects are as follows: Through the first plug-in end provided on the installation position of the generator set and the second plug-in end provided on the energy storage power supply, the detachable connection between the energy storage power supply and the generator set can be realized. After the second plug-in end and the first plug-in end are connected, the generator set and the energy storage power supply can jointly supply power to the load, and the generator set can also charge the energy storage power supply. When the second plug-in end and the first plug-in end are disconnected, the generator set and the energy storage power supply can supply power to the load separately.

[0015] A preferred embodiment of the present utility model lies in that: when the energy storage power supply is installed on the generator set, the energy storage power supply and the generator set are installed and connected or covered by using a set of overall designed housing to form an integrated structure for hybrid power supply.

[0016] The beneficial effects are as follows: when the energy storage power supply is installed on the generator, they are organically integrated in appearance, which is equivalent to a generator set, and can output the power of both at the same time, and the appearance is more beautiful. When it needs to be disassembled for use, just disconnect the first plug-in end and the second plug-in end, making the whole product design beautiful, practical and convenient for disassembly and use.

[0017] A preferred embodiment of the present utility model lies in that: the power supply circuit of the generator set includes a three-phase winding, a rectification module and an inversion module that are electrically connected in sequence, and further includes a first MCU control module. The first MCU control module is used to collect the bus voltage on the line between the rectification module and the inversion module, collect the temperature signal of the inversion module, and sample the peak current and output voltage between the inversion module and the AC output end. An optocoupler isolation module is provided between the inversion module and the first MCU control module, and the first MCU control module uses isolated communication.

[0018] The beneficial effects are as follows: the first MCU control module is used to collect the bus voltage on the line between the rectification module and the inversion module to detect in real time whether the bus voltage is stable at the set value, so as to monitor the fluctuation range of the bus voltage; collect the temperature signal of the inversion module to detect in real time whether the temperature of the inversion module exceeds the set value. If it exceeds the set value, it means that the working temperature is too high, which may affect the components and the power supply of the generator set needs to be disconnected; the first MCU control module also samples the peak current and output voltage between the inversion module and the AC output end. Under hardware trigger conditions, such as when there is a short circuit in the circuit and the instantaneous peak current is too large, it is easy to damage the components. Therefore, in this solution, the peak current is collected, and when the peak current is too large, the connection of the circuit is disconnected to avoid damaging the components; this solution also samples the output voltage at the same time, so as to detect the output voltage in real time and master the output power situation.

[0019] In this solution, an optocoupler isolation module is provided between the inversion module and the first MCU control module, thus realizing the isolation between the high-voltage side and the low-voltage side, avoiding the influence of high voltage on low-voltage signals and increasing safety. The first MCU control module uses isolated communication to avoid interfering with communication signals.

[0020] The preferred embodiment of the present utility model is as follows: The energy storage power supply further includes a second MCU control module, which is used to separately isolate and sample the voltage and current on the line between the battery pack and the bidirectional DC-DC module, sample the bus voltage on the line between the bidirectional DC-DC module and the bidirectional DC-AC module, collect the temperature signal of the bidirectional DC-AC module, and sample the peak current and output voltage on the line between the bidirectional DC-AC module and the AC input / output terminal.

[0021] The beneficial effects are as follows: In this solution, the second MCU control module is used to separately isolate and sample the voltage and current on the line between the battery pack and the bidirectional DC-DC module, so as to monitor the DC voltage and current output by the battery pack in real time; the second MCU control module samples the bus voltage on the line between the bidirectional DC-DC module and the bidirectional DC-AC module, so as to monitor the bus voltage fluctuation in real time, detect whether the bus voltage is stable at the set value, and facilitate the real-time adjustment of the bus voltage to meet the load demand; the second MCU control module collects the temperature signal of the bidirectional DC-AC module, so as to realize the real-time monitoring of the temperature change of the bidirectional DC-AC module (i.e., the inverter), and corresponding measures can be taken in time when the temperature is abnormal; the second MCU control module samples the peak current and output voltage on the line between the bidirectional DC-AC module and the AC input / output terminal, so as to detect the output voltage and current of the energy storage power supply in real time, know the output power situation of the energy storage power supply, and detect in real time whether the output peak current of the energy storage power supply exceeds the set value, so that corresponding measures can be taken in time when the peak current is too large, such as cutting off the load to protect the circuit.

[0022] The preferred embodiment of the present utility model is as follows: The bidirectional DC-DC module includes an H-bridge boost / buck circuit and an H-bridge rectifier circuit that are electrically connected in sequence. An opto-isolation module is respectively provided between the H-bridge boost / buck circuit and the second MCU control module, and between the H-bridge rectifier circuit and the second MCU control module. The bidirectional DC-AC module adopts a full-bridge inverter circuit, and an opto-isolation module is provided between the full-bridge inverter circuit and the second MCU control module. The second MCU control module uses isolated communication.

[0023] The beneficial effects are as follows: In the present utility model, an opto-isolation module is respectively provided between the H-bridge boost / buck circuit and the second MCU control module, and between the H-bridge rectifier circuit and the second MCU control module. The bidirectional DC-AC module adopts a full-bridge inverter circuit, and an opto-isolation module is provided between the full-bridge inverter circuit and the second MCU control module, so as to realize the isolation between the high-voltage side and the low-voltage side, avoid the interference of high-voltage signals on low-voltage signals, and increase safety; the second MCU control module uses isolated communication to reduce the influence of high-voltage signals on communication signals. Description of the Drawings

[0024] Figure 1 This is a schematic block diagram of the oil-electric hybrid power supply system of the present utility model.

[0025] Figure 2 This is a schematic circuit diagram of the generator in the oil-electric hybrid power supply system of the present utility model.

[0026] Figure 3 This is a schematic circuit diagram of the energy storage power supply in the oil-electric hybrid power supply system of the present utility model. Detailed Description of the Preferred Embodiment

[0027] The following is a description of the preferred embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the described preferred embodiments are only used to explain the present utility model and do not limit the protection scope of the present utility model.

[0028] Terms such as "first" and "second" in the specification, claims, and embodiments of this application are used to distinguish similar objects, rather than to describe a specific order or sequence.

[0029] The present utility model will be further described in detail below through preferred specific embodiments:

[0030] The oil-electric hybrid power supply system disclosed in this embodiment includes a generator set and an energy storage power supply. The generator set and the energy storage power supply can supply power to the load independently, or they can be connected in parallel to supply power to the load together. The energy storage power supply can be charged through the AC output terminal of the generator set, or through the mains power, AC charging equipment, or DC charging.

[0031] As shown in the attached Figure 1 figure: The generator set includes a permanent magnet motor and an engine for driving the permanent magnet motor. The engine is started through a starting module, and the permanent magnet motor outputs alternating current after passing through a rectification module and an inversion module. The starting module includes a starting motor or a reverse-dragging starting module. In this embodiment, the engine refers to an internal combustion engine, and the energy storage power supply can be a lithium battery cell, a sodium battery cell, a solid-state battery, etc.

[0032] As shown in the attached Figure 2 figure: The power supply circuit of the generator set includes a three-phase winding, a rectification module, an inversion module, and an LC filter circuit connected in sequence. In this embodiment, the rectification module uses three-phase semi-controlled rectification, and the inversion module uses a full-bridge inversion circuit.

[0033] The power supply circuit of the generator set further includes a first MCU control module, which is used to collect the bus voltage on the line between the rectification module and the inversion module, collect the temperature signal of the inversion module, and sample the peak current and output voltage between the inversion module and the AC output terminal.

[0034] In this embodiment, an optocoupler isolation module is provided between the inversion module and the first MCU control module, and the first MCU control module uses isolated communication.

[0035] As shown in the appendix Figure 1 As shown, the energy storage power supply includes a battery pack, a bidirectional DC-DC module, and a bidirectional DC-AC module that are electrically connected in sequence. The bidirectional DC-AC module is connected to an AC input / output terminal, and the AC output terminal of the generator set can be electrically connected to the AC input / output terminal of the energy storage power supply. The battery pack is also connected to a DC input / output terminal. As shown in the appendix Figure 3 As shown, the bidirectional DC-DC module includes an H-bridge boost / buck circuit and an H-bridge rectification circuit that are electrically connected in sequence. The bidirectional DC-DC module functions to boost (charge) and buck (supply) DC, and also functions to rectify AC. The bidirectional DC-AC module functions to convert DC to AC (when supplying power) and convert AC to DC when charging. An LC filter circuit and a relay switch circuit are connected in sequence after the bidirectional DC-AC module. In this embodiment, capacitors are provided between the neutral line and the ground, and between the live line and the ground of the generator set output, as well as between the neutral line and the ground, and between the live line and the ground of the energy storage power supply output.

[0036] The energy storage power supply further includes a second MCU control module, which is used to separately isolate and sample the voltage and current on the line between the battery pack and the bidirectional DC-DC module, sample the bus voltage on the line between the bidirectional DC-DC module and the bidirectional DC-AC module, collect the temperature signal of the bidirectional DC-AC module, and sample the peak current and output voltage on the line between the bidirectional DC-AC module and the AC input / output terminal. Specifically, the peak current sampling point is on the line between the LC filter circuits, and the output voltage sampling point is on the line between the relay switch circuit and the AC output terminal.

[0037] Optocoupler isolation modules are respectively provided between the H-bridge boost / buck circuit and the second MCU control module, and between the H-bridge rectification circuit and the second MCU control module. The bidirectional DC-AC module uses a full-bridge inverter circuit, and an optocoupler isolation module is provided between the full-bridge inverter circuit and the second MCU control module. The second MCU control module uses isolated communication.

[0038] As shown in the appendix Figure 1As shown, in this embodiment, the energy storage power supply can be used as the starting power supply for the engine of the generator set, powering the starting module of the engine to start the engine.

[0039] In this embodiment, the energy storage power supply can be charged by a generator, or when used alone, it can be charged with direct current such as mains power, AC charging equipment, or solar energy. When the generator set and the energy storage power supply are used in combination, if the load is large, the generator set and the energy storage power supply are connected in parallel to jointly power the load. The electric energy generated by the generator passes through the rectification module and the inversion module and finally powers the AC load through the AC output terminal. The electric energy of the battery pack passes through the bidirectional DC-DC module and the bidirectional DC-AC module to output alternating current to power the load. If the load is small, only the generator set is needed to carry the load. At this time, if the energy storage power supply has insufficient power, while the generator set is carrying the load, the excess electric energy can also be transmitted from its AC output terminal to the AC input / output terminal of the energy storage power supply. The electric energy at the AC input / output terminal passes through the bidirectional DC-AC module and the bidirectional DC-DC module to charge the battery pack. When the generator set is not carrying the load, if the energy storage power supply has insufficient power, the generator set can directly charge the energy storage power supply.

[0040] When the energy storage power supply and the generator set are used separately and independently, if the energy storage power supply has insufficient power, the AC input / output terminal of the energy storage power supply can be directly connected to the mains socket, so as to charge the energy storage power supply through the mains power. Since the battery pack in this solution is also connected with a DC input / output terminal, it can also be charged with direct current such as solar energy or car charging.

[0041] In this embodiment, there is an installation position on the generator set. The installation position can be, but is not limited to, an installation chamber. There is a first plug-in end on the installation position, and a second plug-in end on the energy storage power supply. In this embodiment, the first plug-in end and the second plug-in end can be a socket and a plug respectively. In other embodiments, they can also be other forms of electrical connection methods. After the second plug-in end and the first plug-in end are connected, the generator set and the energy storage power supply can jointly power the load, and the generator set can also charge the energy storage power supply. When the second plug-in end and the first plug-in end are disconnected, the generator set and the energy storage power supply can power the load separately. There is a detachable or flip-open connection and fixation structure outside the installation position. The connection and fixation structure can be, but is not limited to, an integrated protective shell structure. In this embodiment, when the energy storage power supply is installed on the generator set, the energy storage power supply and the generator set are installed and connected or covered with a set of overall design shells to form an integrated structure for hybrid power supply.

[0042] The preferred embodiments of the present application have been described in detail above in conjunction with the accompanying drawings. Typical well-known structures and common general knowledge techniques in the preferred embodiments are not described in detail herein. Those of ordinary skill in the art can, under the inspiration given by this embodiment, complete and implement the technical solution of the present utility model in combination with their own capabilities. Some typical well-known structures, well-known methods or common general knowledge techniques should not become an obstacle for those of ordinary skill in the art to implement the present application.

[0043] The scope of protection required by the present application shall be subject to the content of its claims, and the content recorded in the utility model content, specific implementation manners and the drawings of the description is used to interpret the claims.

[0044] Within the scope of the technical concept of the present application, several variations can also be made to the specific implementation manners of the present application, and these specific implementation manners after variation should also be regarded as within the scope of protection of the present application.

Claims

1. A hybrid power supply system, comprising a generator set and an energy storage power supply, characterized in that: The generator set and the energy storage power supply can supply power to the load independently, or the generator set and the energy storage power supply can be connected in parallel to jointly supply power to the load. The energy storage power supply can be charged through the AC output terminal of the generator set, or by mains power, an AC charging device, or DC charging.

2. The hybrid power supply system according to claim 1, characterized in that: The energy storage power supply includes a battery pack, a bidirectional DC-DC module, and a bidirectional DC-AC module that are electrically connected in sequence. The bidirectional DC-AC module is connected to an AC input / output terminal, and the AC output terminal of the generator set can be electrically connected to the AC input / output terminal of the energy storage power supply.

3. The hybrid power supply system according to claim 2, characterized in that: The battery pack is also connected to a DC input / output terminal.

4. The hybrid power supply system according to claim 1, wherein: The energy storage power supply can be used as the starting power supply for the engine of the generator set to supply power to the starting module of the engine for starting the engine.

5. The hybrid power supply system according to claim 1, wherein: An installation position is provided on the generator set, and a first plug-in terminal is provided at the installation position. A second plug-in terminal is provided on the energy storage power supply. After the second plug-in terminal and the first plug-in terminal are connected, the generator set and the energy storage power supply can jointly supply power to the load, and the generator set can also charge the energy storage power supply. When the second plug-in terminal and the first plug-in terminal are disconnected, the generator set and the energy storage power supply can supply power to the load independently.

6. The hybrid power supply system according to claim 5, characterized in that: When the energy storage power supply is installed on the generator set, the energy storage power supply and the generator set are installed and connected or covered using a set of overall design shells to form an integrated structure for hybrid power supply.

7. The hybrid power supply system according to claim 1, wherein: The power supply circuit of the generator set includes a three-phase winding, a rectification module, and an inversion module that are electrically connected in sequence, and also includes a first MCU control module. The first MCU control module is used to collect the bus voltage on the line between the rectification module and the inversion module, collect the temperature signal of the inversion module, and sample the peak current and output voltage between the inversion module and the AC output terminal. An opto-isolation module is provided between the inversion module and the first MCU control module, and the first MCU control module uses isolated communication.

8. The hybrid power supply system according to claim 1, wherein: The energy storage power supply further includes a second MCU control module. The second MCU control module is used to separately and isolatedly sample the voltage and current on the line between the battery pack and the bidirectional DC-DC module, sample the bus voltage on the line between the bidirectional DC-DC module and the bidirectional DC-AC module, collect the temperature signal of the bidirectional DC-AC module, and sample the peak current and output voltage on the line between the bidirectional DC-AC module and the AC input / output terminal.

9. The hybrid power supply system according to claim 8, wherein: The bidirectional DC-DC module includes an H-bridge boost / buck circuit and an H-bridge rectification circuit that are electrically connected in sequence. Opto-isolation modules are respectively provided between the H-bridge boost / buck circuit and the second MCU control module, and between the H-bridge rectification circuit and the second MCU control module. The bidirectional DC-AC module uses a full-bridge inversion circuit, and an opto-isolation module is provided between the full-bridge inversion circuit and the second MCU control module. The second MCU control module uses isolated communication.

Images