Power supply module, control method and ship oil-electricity hybrid system

Abstract

The embodiment of the invention relates to the technical field of ship power supply, and discloses a power supply module, a control method and a ship oil-electricity hybrid system, and the power supply module comprises a battery module, a generator set, an AC / DC converter, a first DC / DC converter, a DC / AC converter, and a controller. The battery module is connected with the first end of the first DC / DC converter, and the second end of the first DC / DC converter is connected with the DC bus; the generator set is connected with the first end of the AC / DC converter, and the second end of the AC / DC converter is connected with the DC bus. The DC bus is also connected with the first end of the DC / AC converter, and the second end of the DC / AC converter is connected with the AC interface of the power supply module; the direct-current bus is connected with a direct-current interface of the power supply module; the controller is connected with the battery module, the generator set and the direct-current bus; therefore, the power supply state of the power supply module is effectively controlled in different power supply modes, and the stability of the whole power supply system is maintained.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of ship power supply, and particularly to a power supply module, a control method, and a ship hybrid power system. Background Art

[0002] With the increasingly serious global environmental problems, reducing ship emissions and protecting the marine ecosystem have become urgent issues to be solved. The hybrid power system can effectively reduce the energy consumption and emissions of ships and reduce environmental pollution by integrating the advantages of fuel engines and electric motors. In addition, this research meets the requirements of China's ecological civilization construction, helps to achieve the sustainable development of the shipping industry, and contributes to building a beautiful China. In this process, the research on the hybrid power system of ships not only helps to improve the environmental protection level of China's shipbuilding industry but also enhances China's competitiveness in the international shipping market.

[0003] Compared with traditional fuel ships, hybrid power ships have significant advantages in fuel consumption. Through an intelligent energy management strategy, the optimal matching of the engine and the electric motor can be achieved, reducing fuel consumption. At the same time, the efficient operation of the electric motor under low-load conditions helps to reduce the operating costs of ships. In the context of economic globalization, the competition in the shipping industry is becoming increasingly fierce. The research on the hybrid power system of ships helps Chinese shipping enterprises to reduce costs and improve efficiency, thus standing out in the market.

[0004] At present, significant progress has been made in the research on the power propulsion technology of hybrid power ships. Internationally, regions and countries such as Europe and Japan are leading in this field. They have not only achieved rich results in theoretical research but also launched a number of hybrid power ships in practical applications. Domestically, Chinese research institutions and enterprises have also made breakthroughs in the research and development of hybrid power ships. Some products have begun commercial operation, and the development of system integration technology enables hybrid power ships to automatically switch power sources under different navigation modes to achieve the best energy consumption and emission performance.

[0005] Although certain achievements have been made in the existing hybrid power propulsion systems, the development of the power propulsion technology of hybrid power ships also faces a series of challenges. On the one hand, the power system integration technology involves the coordination and matching of multiple subsystems. How to achieve the optimal combination and efficient operation among subsystems is a major challenge in current research. On the other hand, it is necessary to solve the problems of battery life, safety, and cost to promote the popularization of hybrid power ships. At the same time, policy support and market promotion are also key factors in promoting the development of this technology.

[0006] With the continuous development of ship electric propulsion systems, the complexity of ship electric propulsion systems is also increasing continuously. How to meet the energy requirements of electric propulsion systems and achieve effective control of power supply, especially the control of power supply modules in distributed oil-electric hybrid ship propulsion systems, is an urgent problem to be solved. Summary of the Invention

[0007] The purpose of the embodiments of the present application is to provide a power supply module, a control method, and a ship oil-electric hybrid system, so as to effectively control the power supply state of the power supply module in different power supply modes and maintain the stability of the entire power supply system.

[0008] To solve the above technical problems, the embodiments of the present application provide a power supply module, including: a battery module, a generator set, an AC / DC converter, a first DC / DC converter, a DC / AC converter, and a controller; the battery module is connected to the first end of the first DC / DC converter, and the second end of the first DC / DC converter is connected to the DC bus; the generator set is connected to the first end of the AC / DC converter, and the second end of the AC / DC converter is connected to the DC bus; the DC bus is further connected to the first end of the DC / AC converter, and the second end of the DC / AC converter is connected to the AC interface of the power supply module; the DC bus is also connected to the DC interface of the power supply module; the controller is connected to the battery module, the generator set, and the DC bus, and the controller is used to obtain the operating state of the generator set, the operating state of the battery module, and the bus voltage of the DC bus; and determine the power supply mode of the power supply module according to the operating state of the generator set and the operating state of the battery module, the power supply mode including: only the generator set power supply mode, only the battery module power supply mode, and hybrid power supply mode; and adjust the power supply state of the power supply module according to the power supply mode and the bus voltage.

[0009] The embodiments of the present application also provide a control method for a power supply module, which is applied to the controller of the above power supply module; the control method includes: obtaining the operating state of the generator set, the operating state of the battery module, and the bus voltage of the DC bus; determining the power supply mode of the power supply module according to the operating state of the generator set and the operating state of the battery module, the power supply mode including: only the generator set power supply mode, only the battery module power supply mode, and hybrid power supply mode; and adjusting the power supply state of the power supply module according to the power supply mode and the bus voltage.

[0010] The embodiments of the present application also provide a ship oil-electric hybrid system, including: a plurality of the above power supply modules, the DC interfaces of the plurality of power supply modules are connected, and the AC interfaces of the plurality of power supply modules are connected.

[0011] In some embodiments, the power supply module further includes a charging pile and a second DC / DC converter; the charging pile is connected to the first end of the second DC / DC converter, and the second end of the second DC / DC converter is connected to the DC bus.

[0012] In some embodiments, a first switch is provided between the battery module and the first DC / DC converter, and a second switch is provided between the charging pile and the second DC / DC converter; a third switch is provided between the DC bus and the DC / AC converter, and a fourth switch is provided between the DC bus and the DC interface; a first fuse is provided between the DC bus and the first DC / DC converter; a second fuse is provided between the DC bus and the second DC / DC converter; a third fuse is provided between the DC bus and the AC / DC converter.

[0013] The technical solution provided by the embodiments of the present application has at least the following advantages:

[0014] In this embodiment, the DC bus is connected to the battery module through the first DC / DC converter and to the generator set through the AC / DC converter. The DC bus also provides a DC interface and an AC interface through the DC / AC converter to supply power to the load. The controller is connected to the battery module, the generator set, and the DC bus, determines the power supply mode of the power supply module according to the operating states of the generator set and the battery module, and adjusts the power supply state of the power supply module according to the power supply mode and the bus voltage, thereby effectively controlling the power supply state of the power supply module in different power supply modes and maintaining the stability of the entire power supply system. Description of the Drawings

[0015] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the figures do not constitute a proportional limitation.

[0016] Figure 1 is a schematic structural diagram of a power supply module according to an embodiment of the present application;

[0017] Figure 2 is a schematic flowchart of a control method for a power supply module according to an embodiment of the present application;

[0018] Figure 3 is a schematic flowchart of the control process in the power supply mode of only the generator set according to an embodiment of the present application;

[0019] Figure 4 is a schematic flowchart of the control process in the power supply mode of only the battery module according to an embodiment of the present application;

[0020] Figure 5 It is a schematic diagram of the control process in the hybrid power supply mode according to an embodiment of the present application. Detailed implementation manners

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present application, many technical details are provided to help the reader better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present application can still be implemented. The following division of each embodiment is for convenience of description and should not constitute any limitation on the specific implementation manner of the present application. Each embodiment can be combined and cross-referenced with each other without conflict.

[0022] An embodiment of the present application relates to a power supply module, and the specific structural schematic diagram is as Figure 1 shown. The power supply module 10 includes: a battery module 101, a generator set 102, an AC / DC converter 103, a first DC / DC converter 104, a DC / AC converter 105, and a controller (not marked in the figure).

[0023] Specifically, the battery module 101 is connected to the first end of the first DC / DC converter 104, and the second end of the first DC / DC converter 104 is connected to the DC bus; the generator set is connected to the first end of the AC / DC converter 103, and the second end of the AC / DC converter 103 is connected to the DC bus; the DC bus is also connected to the first end of the DC / AC converter 105, and the second end of the DC / AC converter 105 is connected to the AC interface of the power supply module 10; the DC bus is also connected to the DC interface of the power supply module 10; the controller is connected to the battery module, the generator set, and the DC bus, and the controller is used to obtain the operating state of the generator set 102, the operating state of the battery module 101, and the bus voltage of the DC bus; and determine the power supply mode of the power supply module 10 according to the operating state of the generator set 102 and the operating state of the battery module 101. The power supply modes include: only generator set power supply mode, only battery module power supply mode, and hybrid power supply mode; and adjust the power supply state of the power supply module according to the power supply mode and the bus voltage.

[0024] In this embodiment, the DC bus is connected to the battery module through the first DC / DC converter 104 and to the generator set through the AC / DC converter 103. The DC bus also provides a DC interface and an AC interface through the DC / AC converter 105 to supply power to the load. The controller is connected to the battery module 101, the generator set 102, and the DC bus, determines the power supply mode of the power supply module 10 according to the operating states of the generator set 102 and the battery module 101, and adjusts the power supply state of the power supply module 10 according to the power supply mode and the bus voltage, so as to effectively control the power supply state of the power supply module 10 in different power supply modes and maintain the stability of the entire power supply system.

[0025] As Figure 1 shown, the power supply module further includes a charging pile 106 and a second DC / DC converter 107; the charging pile is connected to the first end of the second DC / DC converter 107, and the second end of the second DC / DC converter 107 is connected to the DC bus.

[0026] Specifically, the charging pile 106 is used to charge the battery module 101. When the charging pile 106 is connected to an external power source, the charging pile 106 transfers electrical energy to the DC bus, and the DC bus transfers the electrical energy to the battery module 101. At the same time, the DC bus also transfers the electrical energy to the load connected to the AC interface and the DC interface to supply power to the load; at this time, the generator set 102 stops running, and only the charging pile 106 needs to supply power, thus saving the fuel consumption of the generator set and reducing costs.

[0027] Specifically, a first switch BT1 is provided between the battery module 101 and the first DC / DC converter 104, a second switch BT2 is provided between the charging pile 106 and the second DC / DC converter 107; a third switch BT3 is provided between the DC bus and the DC / AC converter 105, and a fourth switch BT4 is provided between the DC bus and the DC interface; the controller can be connected to the first switch BT1, the second switch BT2, the third switch BT3, and the fourth switch BT4. The controller controls whether the battery module 101 is connected to the DC bus by controlling the first switch BT1, controls whether the charging pile 106 is connected to the DC bus by controlling the second switch BT2, controls whether the AC interface is connected to the load by controlling the third switch BT3, and controls whether the DC interface is connected to the load by controlling the fourth switch BT4.

[0028] Specifically, a first fuse FU1 is provided between the DC bus and the first DC / DC converter 101; a second fuse FU2 is provided between the DC bus and the second DC / DC converter 107; a third fuse GU3 is provided between the DC bus and the AC / DC converter 103. In this embodiment, fuses are provided between the charging pile 106 and the bus, between the battery module 101 and the bus, and between the generator set 102 and the bus, so that in the case of a short circuit or other faults at any power supply end, they can be effectively disconnected, improving the safety of the power supply module.

[0029] On the other hand, this embodiment provides a control method for a power supply module, which is applied to the controller of the power supply module in the above embodiment; as Figure 2 shown, it is a schematic flow chart of the control method of the power supply module in this embodiment. The control method of the power supply module includes the following steps:

[0030] Step 201, obtain the operating state of the generator set, the operating state of the battery module, and the bus voltage of the DC bus.

[0031] Step 202, determine the power supply mode of the power supply module according to the operating state of the generator set and the operating state of the battery module.

[0032] Step 203, adjust the power supply state of the power supply module according to the power supply mode and the bus voltage.

[0033] Specifically, the power supply modes include: only generator set power supply mode, only battery module power supply mode, and hybrid power supply mode; in this embodiment, different control is performed on the power supply state of the power supply module according to different power supply modes.

[0034] In this embodiment, the controller determines the power supply mode of the power supply module according to the operating state of the generator set and the operating state of the battery module, and adjusts the power supply state of the power supply module according to the power supply mode and the bus voltage, so as to effectively control the power supply state of the power supply module in different power supply modes and maintain the stability of the entire power supply system.

[0035] As Figure 3 shown, it is a schematic flow chart of the control process in the only generator set power supply mode in this embodiment. The following steps are sub-steps of step 203. In the case where the power supply mode is the only generator set power supply mode, the controller executes the following steps:

[0036] Step 301, determine whether the bus voltage meets the first preset condition. If it meets, enter step 302; if not, enter step 305, and maintain the current power supply state of the generator set.

[0037] Among them, the first preset condition is that the fluctuation of the bus voltage exceeds the first preset range and the fluctuation duration exceeds the first preset time length. The first preset range can be set according to actual needs. For example, the first preset range is the fluctuation range of plus or minus 2% of the bus voltage reference value Vref, that is, the first preset range is from 98%Vref to 102%Vref. The fluctuation duration t can be set according to actual needs, such as 2s, 4s, etc.

[0038] Step 302, determine whether the state of the battery module is normal. If it is normal, proceed to step 303; if it is not normal, proceed to step 304.

[0039] Step 303, control the battery module to start power supply.

[0040] Specifically, when the battery module is normal, connect the battery module to the DC bus and supply power to the load through the battery module; at this time, the generator set is still in the power supply state, and the power supply mode of the battery module is converted from only the generator set power supply to the hybrid power supply mode, so as to conduct the control of the hybrid power supply mode.

[0041] Step 304, control the AC interface and / or the DC interface to disconnect.

[0042] Specifically, when the battery module is abnormal, keep the power supply state of the generator set, disconnect the AC interface and / or the DC interface, so as to reduce the running load and reduce the power supply power of the generator set.

[0043] Step 305, keep the current power supply state of the generator set.

[0044] This embodiment is the state of a single generator connected to the grid for power supply. In this state, the battery module is not connected to the DC bus, and the generator set is separately connected to the DC bus to supply power to the load. When it is detected that the fluctuation amplitude of the DC bus voltage exceeds plus or minus 2% of the bus voltage reference value Vref and the duration exceeds 2s, according to whether the battery module is in a normal state at this time, it is judged whether to parallel the battery module to the bus. When it is normal, close the first switch; when it is not normal, adjust the load size.

[0045] As Figure 4 shown, it is a schematic diagram of the control process in the power supply mode of only the battery module in this embodiment. The following steps are sub-steps of step 203. In the case where the power supply mode is the power supply mode of only the battery module, the battery module is connected to the DC bus to provide energy for the load, the battery module supplies power, and the generator does not supply power. The execution steps of the controller are as follows:

[0046] Step 401, obtain the remaining power of the battery module.

[0047] Step 402: Determine whether the remaining power exceeds a first preset threshold. If it exceeds, proceed to step 403; if not, proceed to step 407 to determine whether the remaining power is greater than a second preset threshold.

[0048] Specifically, the first preset threshold is greater than the second preset threshold; when the remaining power is greater than the first preset threshold, the battery module is in a discharging mode and cannot be charged; when the remaining power is between the second preset threshold and the first preset threshold, the battery module is in a charge-discharge mode, that is, the battery module supplies power to the load through the DC bus, and at the same time, the generator set charges the battery module; when the remaining power is lower than the second preset threshold, the battery module is in a charging mode, and the generator set charges the battery module, and at this time, the battery module can be regarded as a load. In this embodiment, the first preset threshold can be 85%, and the second preset threshold can be 20%. In other embodiments, it can also be set to other values according to actual needs.

[0049] Step 403: Determine whether the bus voltage meets a first preset condition. If it meets, proceed to step 404; if not, proceed to step 416 to maintain the current power supply mode of the battery module.

[0050] The first preset condition is that the fluctuation of the bus voltage exceeds a first preset range and the fluctuation duration exceeds a first preset time length. The first preset range can be set according to actual requirements. For example, the first preset range is a fluctuation range of plus or minus 2% of the bus voltage reference value Vref, that is, the first preset range is 98%Vref to 102%Vref, and the first preset time length can be set according to actual requirements, such as 2s, 4s, etc.

[0051] Step 404: Determine whether the generator set is normal. If it is normal, proceed to step 405; if not, proceed to step 406.

[0052] Step 405: Control the generator set to start supplying power.

[0053] Specifically, when the generator set is normal, connect the generator set to the DC bus and supply power to the load through the generator set; at this time, the battery module is still in a power supply state, and the power supply mode of the battery module is converted from only the battery module supplying power to a hybrid power supply mode, so as to control the hybrid power supply mode.

[0054] Step 406: Control the AC interface and / or the DC interface to disconnect.

[0055] Specifically, when the generator set is abnormal, maintain the power supply state of the battery module, disconnect the AC interface and / or the DC interface, so as to reduce the running load and reduce the power supply power of the battery module.

[0056] Step 407: Determine whether the remaining power exceeds the second preset threshold. If the remaining power is greater than the second preset threshold and less than the first preset threshold, proceed to step 408; if the remaining power is lower than the second preset threshold, proceed to step 412. Here, the first preset threshold is greater than the second preset threshold;

[0057] Step 408: Determine whether the bus voltage meets the first preset condition. If it meets the condition, proceed to step 409; if it does not meet the condition, proceed to step 416 to maintain the current battery module power supply mode.

[0058] Step 409: Determine whether the generator set is normal. If it is normal, proceed to step 410; if it is not normal, proceed to step 411.

[0059] Step 410: Control the generator set to start power supply.

[0060] Specifically, when the generator set is normal, connect the generator set to the DC bus and supply power to the load through the generator set; at this time, the battery module is still in the power supply state, and the power supply mode of the battery module is converted from only the battery module power supply to the hybrid power supply mode, so as to control the hybrid power supply mode. At this time, the remaining power is greater than the second preset threshold and less than the first preset threshold, and the battery module is in the charge and discharge mode.

[0061] Step 411: Control the AC interface and / or the DC interface to disconnect.

[0062] Specifically, when the generator set is abnormal, maintain the power supply state of the battery module, disconnect the AC interface and / or the DC interface, so as to reduce the operating load and the power supply power of the battery module.

[0063] Step 412: Control the battery module to stop power supply.

[0064] Specifically, when the remaining power is lower than the second preset threshold, control the battery module to stop power supply, and only the generator set supplies power, and the battery module is in the charging mode.

[0065] Step 413: Determine whether the generator set is normal. If it is normal, proceed to step 414; if it is not normal, proceed to step 415.

[0066] Step 414: Control the generator set to start power supply.

[0067] Specifically, when the generator set is normal, connect the generator set to the DC bus and supply power to the load through the generator set; at this time, the battery module stops power supply, and the power supply mode of the battery module is converted from only the battery module power supply to the generator set power supply mode, so as to control the generator set power supply mode.

[0068] Step 415: Control the AC interface and the DC interface to disconnect.

[0069] Specifically, in the case of abnormal operation of the generator set, disconnect the AC interface and the DC interface to stop power supply until the generator set returns to normal, or until the battery module enters the charge-discharge mode or the discharge mode.

[0070] Step 416, maintain the current power supply mode of the battery module.

[0071] In practical applications, the first preset threshold can be 85%, the second preset threshold can be 20%, and the first preset duration can be set to 2 s. When it is detected that the remaining power SOC of the battery module > 85%, the battery module is in the discharge state; when the DC bus voltage is not within the range of Vref - Vref*2% to Vref + Vref*2% and the duration exceeds 2 s, start or adjust the load size according to the generator state; when it is detected that the battery SOC < 20%, the battery module is in the charging state, start or stop the module from supplying power to the outside according to the generator state; when it is detected that the SOC of the battery is between 20% and 85%, the battery module is in the charge-discharge state. If the bus voltage is not within the range of Vref - Vref*2% to Vref + Vref*2%, start the generator set or adjust the load size according to the generator state, otherwise the battery module continues to meet the load power demand alone.

[0072] As Figure 5 shown, it is a schematic diagram of the control process in the hybrid power supply mode of this embodiment. The following steps are sub-steps of step 203. In the case where the power supply mode is the hybrid power supply mode, the battery module and the generator set are both connected to the DC bus to work together to provide energy for the load. When the battery module supplies power and the generator starts, the controller of this embodiment executes the following steps:

[0073] Step 501, obtain the remaining power of the battery module.

[0074] Step 502, determine the charge-discharge state of the battery module according to the remaining power.

[0075] Among them, the charge-discharge state includes the discharge mode, the charging mode, and the charge-discharge mode.

[0076] Specifically, obtain the charge and discharge state of the battery module according to the remaining power, including: when the remaining power gradually increases and exceeds the first preset threshold, the battery module switches from the charge and discharge mode to the discharge mode; when the remaining power gradually decreases and is lower than the second preset threshold, the battery module switches from the charge and discharge mode to the charging mode; the second preset threshold is less than the first preset threshold; when the remaining power gradually decreases and is lower than the third preset threshold, the battery module switches from the discharge mode to the charge and discharge mode, and the third preset threshold is slightly less than the first preset threshold and greater than the second preset threshold; when the remaining power gradually increases and exceeds the fourth preset threshold, the battery module switches from the charging mode to the charge and discharge mode, and the fourth preset threshold is slightly greater than the second preset threshold and less than the third preset threshold. The first preset threshold in this embodiment can be 85%, the second preset threshold can be 20%, the third preset threshold can be 70%, and the fourth preset threshold can be 30%. In other embodiments, it can also be set to other values according to actual needs.

[0077] Step 503, determine whether the battery module is in the discharge mode. If so, proceed to step 504; if not, proceed to step 508, that is, determine whether the battery module is in the charging mode.

[0078] Step 504, continuously determine whether the bus voltage meets the first preset condition. If it meets, proceed to step 505; if it does not meet, maintain the current hybrid power supply mode.

[0079] The first preset condition is that the fluctuation of the bus voltage exceeds the first preset range and the fluctuation duration exceeds the first preset time length;

[0080] Step 505, determine whether the discharge power of the battery module is 0. If not, proceed to step 506; if so, proceed to step 507.

[0081] Step 506, reduce the discharge power of the battery module according to the first preset ratio. Then, return to step 504 and continue to determine whether the bus voltage meets the first preset condition.

[0082] Specifically, the first preset ratio can be 10% or 5%, and can be set according to actual requirements.

[0083] Step 507, adjust the output power of the generator set or control the AC interface and / or DC interface to disconnect.

[0084] In practical applications, the first preset range can be set to the range of plus or minus 2% of the rated power, and the corresponding first preset ratio is set to 10%. When the SOC of the battery > 85%, it is in the discharge working mode. The discharge amount is judged according to the bus voltage fluctuation. When the DC bus voltage is not within the range of Vref - Vref*2% to Vref + Vref*2%, the discharge power of the battery module is adjusted at 10% of the rated power. If the bus voltage fluctuation still exceeds 2% after the discharge power of the battery module is adjusted to 0, then the load size or the output power of the generator set is adjusted; when the battery SOC is less than 75%, the discharge working mode is exited.

[0085] It should be noted that when the discharge power of the battery module is adjusted at 10% of the rated power, the bus voltage is within the range of Vref - Vref*2% to Vref + Vref*2%, but not within the range of Vref - Vref*1% to Vref + Vref*1%. It continues to be adjusted at a smaller 5% of the rated power until the bus voltage is between Vref - Vref*1% and Vref + Vref*1%.

[0086] Step 508, determine whether the battery module is in the charging mode. If yes, go to step 509; if no, the battery module is in the charge-discharge mode, go to step 513.

[0087] Step 509, continuously determine whether the bus voltage meets the first preset condition. If it meets, go to step 510; if it does not meet, maintain the current hybrid power supply mode.

[0088] Step 510, determine whether the charging power of the battery module is 0. If not, go to step 511; if yes, go to step 512.

[0089] Step 511, reduce the charging power of the battery module according to the second preset ratio. Then, return to step 509 and continue to determine whether the bus voltage meets the first preset condition.

[0090] Step 512, adjust the output power of the generator set or control the AC interface and / or DC interface to disconnect.

[0091] In practical applications, when the SOC of all battery modules is less than 20%, the battery module is in the charging working mode. The charging current size is judged according to the bus voltage fluctuation. When the DC bus voltage is not within the range of Vref - Vref*2% to Vref + Vref*2%, the charging power of the battery module is adjusted at 10% of the rated power. If the bus voltage fluctuation still exceeds 2% after the charging power of the battery module is adjusted to 0, then the load size or the output power of the generator set is adjusted. When the battery SOC is greater than 35%, the charging working mode is exited.

[0092] It should be noted that after the charging power of the battery module is adjusted by 10% of the rated power, the bus voltage is within the range of Vref - Vref*2% to Vref + Vref*2%, but not within the range of Vref - Vref*1% to Vref + Vref*1%. Then, it continues to be adjusted with a smaller 5% of the rated power until the bus voltage is between Vref - Vref*1% and Vref + Vref*1%.

[0093] Step 513, continuously determine whether the bus voltage meets the first preset condition. If it meets, go to step 514; if not, maintain the current hybrid power supply mode.

[0094] Step 514, determine whether the charging power and / or discharging power of the battery module is 0. If not, go to step 515; if so, go to step 516.

[0095] Step 515, reduce the charging power of the battery module according to the first preset ratio and reduce the discharging power of the battery module according to the second preset ratio. Then, return to step 513 and continue to determine whether the bus voltage meets the first preset condition.

[0096] Step 516, control the AC interface and / or DC interface to disconnect.

[0097] In practical applications, when the SOC of the battery module is greater than 20% and less than 85%, the battery is in the charge-discharge mode. The magnitudes of the charging current and discharging current are judged according to the fluctuation of the bus voltage. When the DC bus voltage is not within the range of Vref - Vref*2% to Vref + Vref*2%, the charging power and discharging power of the battery module are adjusted with 10% of the rated power. If the fluctuation of the bus voltage still exceeds 2% after the charging power and / or discharging power of the battery module is adjusted to 0, then the load size is adjusted.

[0098] Specifically, in the case where the battery module is in the charging state or the charge-discharge state, if the fluctuation of the bus voltage is within the second preset range and the duration exceeds the second preset duration, then control the generator set to stop power supply. At this time, only the power supply module supplies power, and at this time, the power supply module switches from the hybrid power supply mode to the battery module power supply mode and is managed according to the battery module power supply mode.

[0099] It should be noted that the second preset range is smaller than the first preset range, and the second preset duration is greater than the first preset duration. For example, the first preset range is Vref - Vref*2% to Vref + Vref*2%, the second preset range is Vref - Vref*1% to Vref + Vref*1%, the first preset duration is 2s, and the second preset duration can be set to 10s, 20s, etc.

[0100] Specifically, in the case where the power supply mode is a hybrid power supply mode, if a battery module fails, the control makes the battery module stop operating, which is equivalent to the generator set being connected to the load for power supply alone, i.e., the generator set power supply mode; if the generator set fails, the control makes the generator set stop operating, which is equivalent to the battery module being connected to the load for power supply alone, i.e., the battery module power supply mode.

[0101] The control method of the power supply module in this embodiment mainly controls the energy storage output power, the generator power, and adjusts the load size according to the state of the generator, the energy storage state, and the bus voltage state. The whole process is divided into three control methods: the power supply state of a single generator, the energy storage power supply state, and the hybrid oil-electric power supply state. Flexible switching can be carried out between multiple control methods, improving the flexibility and efficiency of control.

[0102] Specifically, the generator set includes that the generator set control method mainly controls the start, stop, acceleration, deceleration, voltage increase and decrease, fault simulation, and grid connection management of the generator set according to the generator state and the generator control signal, and is mainly divided into control under two working modes: manual mode and semi-automatic mode.

[0103] The grid connection control method of the generator set is as follows:

[0104] First, it is judged whether the generator set is running. If the generator set is running, it is continued to judge whether there is a manual control signal. If there is a manual control signal, it is executed according to the manual control signal. If there is no manual control signal, it is judged whether semi-automatic control is allowed. If semi-automatic control is allowed, it is executed according to the semi-automatic control signal. If semi-automatic control is not allowed, the original state is maintained; since the corresponding third fuse remains conducting after the generator is disconnected from the grid, if there is a manual shutdown or a fault shutdown of the generator set, there will be a safety risk, and the third fuse needs to be disconnected to ensure the safety of the system; therefore, if the generator set stops running, it is judged whether the delay time meets the requirements. If the delay time meets the requirements, the third fuse corresponding to the generator set is disconnected. If the delay time does not meet the requirements, the original state is maintained.

[0105] The start-stop control method of the generator set is as follows:

[0106] First, it is judged whether the generator set has a fault. If the generator set has a fault, the generator set stops. If the generator set has no fault, it is continued to judge whether the generator set has an emergency stop; if the generator set has an emergency stop, the generator set stops. If the generator set has no emergency stop, it is continued to judge whether there is a manual control signal; if there is a manual control signal, it is executed according to the manual control signal. If there is no manual control signal, it is judged whether semi-automatic control is allowed; if semi-automatic control is allowed, it is executed according to the semi-automatic control signal. If semi-automatic control is not allowed, the original state is maintained.

[0107] The method for controlling the acceleration and deceleration of the generating set is as follows:

[0108] First, determine whether there is start-stop control for the generating set. If there is start-stop control for the generating set, execute the start-stop control. If there is no start-stop control for the generating set, continue to determine whether the generating set starts. If the generating set does not start, maintain the original state. If the generating set starts, continue to determine whether there is manual acceleration and deceleration control. If there is manual acceleration and deceleration control, execute according to the manual signal. If there is no manual acceleration and deceleration control, determine whether semi-automatic control is allowed. If semi-automatic control is allowed, execute according to the semi-automatic control signal. If semi-automatic control is not allowed, maintain the original state.

[0109] The method for controlling the voltage increase and decrease of the generating set is as follows:

[0110] First, determine whether there is start-stop control for the generating set. If there is start-stop control for the generating set, execute the start-stop control. If there is no start-stop control for the generating set, continue to determine whether the generating set starts. If the generating set does not start, maintain the original state. If the generating set starts, continue to determine whether there is manual voltage increase and decrease control. If there is manual voltage increase and decrease control, execute according to the manual signal. If there is no manual voltage increase and decrease control, determine whether semi-automatic control is allowed. If semi-automatic control is allowed, execute according to the semi-automatic control signal. If semi-automatic control is not allowed, maintain the original state.

[0111] The power supply module of this embodiment can be applied in a hybrid ship power propulsion system, and can realize the control of the power supply module of the oil-electric hybrid ship power propulsion system. At the same time, it can also realize the control of the generator of the oil-electric hybrid ship power propulsion system, realize the manual and semi-automatic working mode switching of the generator according to the state of the generating set, realize the control of the generator speed and voltage according to the load demand, and realize the parallel operation of the generator - battery module. The battery module meets the compensation demand of the ship integrated power propulsion system according to the monitoring state.

[0112] Another aspect of this application also relates to a ship oil-electric hybrid system, including: a plurality of power supply modules as described in the above embodiment, the DC interfaces of the plurality of power supply modules are connected, and the AC interfaces of the plurality of power supply modules are connected.

[0113] This embodiment can realize the parallel control of the modules of the ship oil-electric hybrid power propulsion system, meet the power supply requirements of the system for large-power loads and the power requirements of the load when the power supply fails; and can realize the automatic switching of the distributed generator - battery module, select the number of power supply modules to be put into according to needs, and meet the power supply requirements of the ship integrated power propulsion system.

[0114] It is not difficult to find that this embodiment is a system embodiment corresponding to the above structural embodiment, and this embodiment can be implemented in cooperation with the structural embodiment. The relevant technical details mentioned in the structural embodiment are still valid in this embodiment. To avoid repetition, they will not be elaborated here. Correspondingly, the relevant technical details mentioned in this embodiment can also be applied to the structural embodiment.

[0115] Those of ordinary skill in the art can understand that the above embodiments are specific embodiments for implementing the present application, and in actual applications, various changes can be made to them in form and details without departing from the spirit and scope of the present application.

Claims

1. A power supply module, characterized in that: include: Battery module, generator set, AC / DC converter, first DC / DC converter, DC / AC converter, controller; The battery module is connected to a first end of the first DC / DC converter, and a second end of the first DC / DC converter is connected to a DC bus; the generator set is connected to a first end of the AC / DC converter, and a second end of the AC / DC converter is connected to the DC bus; The DC bus is also connected to the first end of the DC / AC converter, and the second end of the DC / AC converter is connected to the AC interface of the power supply module; the DC bus is also connected to the DC interface of the power supply module; The controller is connected to the battery module, the generator set, and the DC bus, and is used to obtain the operating status of the generator set, the operating status of the battery module, and the bus voltage of the DC bus; and determining a power supply mode of the power supply module according to the operating state of the generator set and the operating state of the battery module, wherein the power supply mode includes: a power supply mode of only the generator set, a power supply mode of only the battery module, and a mixed power supply mode; The power supply state of the power supply module is adjusted according to the power supply mode and the bus voltage.

2. The power supply module according to claim 1, characterized in that: The power supply module also includes a charging pile and a second DC / DC converter; The charging pile is connected to a first end of the second DC / DC converter, and a second end of the second DC / DC converter is connected to the DC bus.

3. The power supply module according to claim 2, characterized in that: A first switch is provided between the battery module and the first DC / DC converter, and a second switch is provided between the charging pile and the second DC / DC converter; a third switch is provided between the DC bus and the DC / AC converter, and a fourth switch is provided between the DC bus and the DC interface; A first fuse is provided between the DC bus and the first DC / DC converter; a second fuse is provided between the DC bus and the second DC / DC converter; and a third fuse is provided between the DC bus and the AC / DC converter.

4. A control method for a power supply module, characterized in that: A controller applied to a power supply module according to any one of claims 1 to 3; the control method comprising: Obtaining the operating status of the generator set, the operating status of the battery module, and the bus voltage of the DC bus; Determine the power supply mode of the power supply module according to the operating status of the generator set and the operating status of the battery module, the power supply mode including: only the generator set power supply mode, only the battery module power supply mode, and a mixed power supply mode; The power supply state of the power supply module is adjusted according to the power supply mode and the bus voltage.

5. The control method of the power supply module according to claim 4, characterized in that: The adjusting the power supply state of the power supply module according to the power supply mode and the bus voltage includes: In the case where the power supply mode is the power supply mode of the generator set only, if the bus voltage meets a first preset condition, it is determined whether the state of the battery module is normal; the first preset condition is that the fluctuation of the bus voltage exceeds a first preset range and the fluctuation duration exceeds a first preset time length; If the state of the battery module is normal, the battery module is controlled to start supplying power; if the state of the battery module is abnormal, the AC interface and / or the DC interface is controlled to be disconnected.

6. The control method of the power supply module according to claim 4, characterized in that: The adjusting the power supply state of the power supply module according to the power supply mode and the bus voltage includes: When the power supply mode is a power supply mode of only the battery module, obtaining the remaining power of the battery module; In the case where the remaining power exceeds the first preset threshold, if the bus voltage meets the first preset condition, it is determined whether the generator set is normal; if the generator set is normal, the generator set is controlled to start power supply; if the generator set is abnormal, the AC interface and / or the DC interface is controlled to be disconnected; the first preset condition is that the fluctuation of the bus voltage exceeds the first preset range and the fluctuation duration exceeds the first preset duration; When the remaining power is greater than the second preset threshold and less than the first preset threshold, if the bus voltage meets the first preset condition, it is determined whether the generator set is normal; when the generator set is normal, the generator set is controlled to start supplying power, wherein the generator set also supplies power to the battery module; when the generator set is abnormal, the AC interface and / or the DC interface is controlled to be disconnected; the first preset threshold is greater than the second preset threshold; When the remaining power is lower than the second preset threshold, the battery module is controlled to stop supplying power, and it is determined whether the generator set is normal; when the generator set is normal, the generator set is controlled to start supplying power; when the generator set is abnormal, the AC interface and the DC interface are controlled to be disconnected.

7. The control method of the power supply module according to claim 4, characterized in that: The adjusting the power supply state of the power supply module according to the power supply mode and the bus voltage includes: When the power supply mode is a hybrid power supply mode, obtaining the remaining power of the battery module; Determine the charge and discharge state of the battery module according to the remaining power, wherein the charge and discharge state includes a discharge mode, a charge mode, and a charge and discharge mode; When the battery module is in the discharge mode, it is determined in real time whether the bus voltage meets the first preset condition. If so, the discharge power of the battery module is reduced according to a first preset ratio. If the discharge power of the battery module is 0 after multiple adjustments and the bus voltage still meets the first preset condition, the output power of the generator set is adjusted or the AC interface and / or the DC interface are controlled to be disconnected. The first preset condition is that the fluctuation of the bus voltage exceeds a first preset range and the fluctuation duration exceeds a first preset duration. When the battery module is in charging mode, whether the bus voltage meets the first preset condition is determined in real time. If the bus voltage meets the first preset condition, the charging power of the battery module is reduced according to a second preset ratio. If the charging power of the battery module is 0 after multiple cycles of adjustment, and the bus voltage still meets the first preset condition, the output power of the generator set is adjusted or the AC interface and / or the DC interface is controlled to be disconnected. When the battery module is in the charge and discharge mode, it is determined in real time whether the bus voltage meets the first preset condition. If so, the charging power of the battery module is reduced according to the first preset ratio, and the charging power of the battery module is reduced according to the second preset ratio. If after multiple cycles of adjustment, the charging power and / or discharging power of the battery module is 0, and the fluctuation of the bus voltage still meets the first preset condition, the AC interface and / or the DC interface are controlled to be disconnected.

8. The control method of the power supply module according to claim 7, characterized in that: The acquiring the charge and discharge state of the battery module according to the remaining power includes: When the remaining power gradually increases and exceeds a first preset threshold, the battery module switches from a charge-discharge mode to a discharge mode; When the remaining power gradually decreases and is lower than a second preset threshold, the battery module switches from the charge-discharge mode to the charge mode; the second preset threshold is lower than the first preset threshold; When the remaining power gradually decreases and is lower than a third preset threshold, the battery module switches from the discharge mode to the charge-discharge mode, and the third preset threshold is slightly lower than the first preset threshold and higher than the second preset threshold; When the remaining power gradually increases and exceeds a fourth preset threshold, the battery module switches from a charging mode to a charging and discharging mode, and the fourth preset threshold is slightly greater than the second preset threshold and less than the third preset threshold.

9. The control method of the power supply module according to claim 7 or 8, characterized in that: When the battery module is in a charging state or a charging and discharging state, if the bus voltage fluctuates within a second preset range and lasts for more than a second preset time, the generator set is controlled to stop supplying power.

10. A ship oil-electric hybrid system, characterized in that: The system comprises: a plurality of power supply modules according to any one of claims 1 to 3, a plurality of DC interfaces of the power supply modules being connected, and a plurality of AC interfaces of the power supply modules being connected.

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