WO2023093172A1

WO2023093172A1 - Energy control system of direct current networking ship hybrid power laboratory and control method therefor

Info

Publication number: WO2023093172A1
Application number: PCT/CN2022/115433
Authority: WO
Inventors: 马烁凯; 叶飞; 熊庆文
Original assignee: 中船动力研究院有限公司
Priority date: 2021-11-26
Filing date: 2022-08-29
Publication date: 2023-06-01
Also published as: CN113937747A

Abstract

Disclosed in embodiments of the present application are an energy control system of a direct current networking ship hybrid power laboratory and a control method therefor. The energy control system comprises: a state collection module connected to a diesel generator set, a lithium battery pack, a super capacitor, a propulsion motor, a factory power grid, a first direct current bus, and a second direct current bus, and configured to collect operation information of the diesel generator set, the lithium battery pack, the super capacitor, the propulsion motor, the factory power grid, the first direct current bus, and the second direct current bus; and a PLC master controller comprising a signal collection input end and a control output end, the signal collection input end being electrically connected to the state collection module, and the control output end being connected to control ends of a rectification power distribution cabinet, a chopper cabinet, and an inverter power supply cabinet to perform energy control on the diesel generator set, the lithium battery pack, and the propulsion motor.

Description

Energy control system and control method of DC networked ship hybrid laboratory

This application claims priority to a Chinese patent application with application number 202111419144.7 filed with the China Patent Office on November 26, 2021, the entire contents of which are incorporated herein by reference.

technical field

The embodiments of the present application relate to the technical field of ships, for example, to an energy control system and a control method for a DC networked ship hybrid laboratory.

Background technique

At present, the ship electric propulsion system basically adopts the AC networking method. During the power generation, grid connection and distribution process, the power loss is high, the energy utilization rate is low, and the grid connection process will cause shocks to the AC system.

The DC network power distribution method gathers the electric energy together through the DC bus, and then distributes it to the relevant loads. The DC load is directly powered by the DC bus or step-down power supply. The AC load uses the inverter to convert the DC power into AC power, saving The process of communicating with the grid. At the same time, the DC network power distribution method has the advantages of low loss, high power quality, and efficient energy distribution management, and can be connected to new energy sources such as lithium batteries and photovoltaics, avoiding the low energy utilization rate of the AC network power distribution method. Energy conversion is slow and so on.

In recent years, there have been more and more studies on the use of DC network power distribution for electric propulsion ships. However, for multiple energy sources connected to the power grid at the same time, the management scheme to achieve efficient energy distribution is not mature. Management studies will be key to achieving efficient energy utilization.

Contents of the invention

Embodiments of the present application provide an energy control system and a control method thereof for a DC networked ship hybrid laboratory, so as to realize efficient energy distribution.

In the first aspect, the embodiment of the present application provides an energy control system for a DC networked ship hybrid laboratory, including:

The rectifier power distribution cabinet is connected between the diesel generator set and the first DC bus, and is connected between the power grid in the factory area and the first DC bus;

The chopper cabinet is connected between the lithium battery pack and the first DC bus, and is connected between the supercapacitor and the first DC bus;

The inverter power supply cabinet is connected between the first DC bus and the propulsion motor, and is connected between the first DC bus and the second DC bus; wherein, the second DC bus is set to Electric load power supply;

The state acquisition module is connected with the diesel generator set, the lithium battery pack, the supercapacitor, the propulsion motor, the power grid in the plant area, the first DC bus and the second DC bus, the The state collection module is configured to collect the operation information of the diesel generator set, the lithium battery pack, the supercapacitor, the propulsion motor, the power grid in the plant area, the first DC bus and the second DC bus ;

The PLC main controller includes a signal acquisition input end and a control output end, the signal acquisition input end is electrically connected to the state acquisition module; the control output end is connected to the rectifier power distribution cabinet, the chopper cabinet and the The control terminal of the inverter power supply cabinet is connected, and the PLC main controller is configured to perform energy control on the diesel generator set, the lithium battery pack and the propulsion motor.

In the second aspect, the embodiment of the present application also provides a control method for the energy control system of the DC networked ship hybrid laboratory, which is applicable to the energy control of the DC networked ship hybrid laboratory provided by any embodiment of the present application The system, the control method includes:

Collecting the operation information of the diesel generator set, the lithium battery pack, the supercapacitor, the propulsion motor, the power grid of the plant area, the first DC bus and the second DC bus;

According to the operation information, the control system is controlled to be in at least one of the following operation modes: pure electric mode, single diesel engine hybrid mode, dual diesel engine hybrid mode, single diesel engine mode, and dual diesel engine mode.

Description of drawings

FIG. 1 is a schematic structural diagram of an energy control system for a DC networked ship hybrid laboratory provided in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of the connection between the energy control system and the power supply equipment of a DC networked ship hybrid laboratory provided by the embodiment of the present application;

FIG. 3 is a schematic structural diagram of another energy control system for a DC networked ship hybrid laboratory provided by an embodiment of the present application;

FIG. 4 is another energy control system for a DC networked ship hybrid laboratory provided by an embodiment of the present application;

FIG. 5 is a schematic flowchart of a control method for an energy control system of a DC networked ship hybrid laboratory provided in an embodiment of the present application;

FIG. 6 is a schematic flowchart of another control method for an energy control system of a DC networked ship hybrid laboratory provided by an embodiment of the present application;

FIG. 7 is a schematic flowchart of a main logic control method provided by an embodiment of the present application.

Detailed ways

This application provides an energy control system for a DC networked ship hybrid laboratory. Figure 1 is a schematic structural diagram of an energy control system for a DC networked ship hybrid laboratory provided by an embodiment of the present application, and Figure 2 is an energy control system for a DC networked ship hybrid laboratory provided by an embodiment of this application Schematic diagram of the connection with the power supply equipment. Referring to Fig. 1 and Fig. 2, the energy control system of the DC network ship hybrid laboratory includes: rectifier power distribution cabinet 110 (AC/DC), chopper cabinet 120 (DC/DC), inverter power cabinet 130 (DC/DC AC), state acquisition module 140 and PLC main controller 150. The rectifier power distribution cabinet 110 is connected between the diesel generator set, referred to as the diesel generator set 200 (Diesel Generator, DG) (referred to as the diesel generator set) and the first DC bus 300, and connected to the power grid of the factory area and the first DC bus. between the bus bars 300; the chopper cabinet 120 is connected between the lithium battery pack 400 and the first DC bus bar 300, and between the supercapacitor and the first DC bus bar 300; the inverter cabinet 130 is connected to the first DC bus bar 300; Between the flow bus 300 and the propulsion motor 500 (Motor, for example, a variable frequency motor), and between the first DC bus 300 and the second DC bus 600; wherein, the second DC bus 600 is set to provide power to the load ( For example, a resistive load bank 700) provides power. The state acquisition module 140 is connected with the diesel generator set 200, the lithium battery pack 400, the supercapacitor, the propulsion motor 500, the power grid of the factory area, the first DC bus 300 and the second DC bus 600, and is configured to collect their operation information. The PLC main controller 150 includes a signal acquisition input terminal and a control output terminal, the signal acquisition input terminal is electrically connected to the state acquisition module 140; connected to perform energy control on the diesel generator set 200, the lithium battery pack 400 and the propulsion motor 500. As shown in FIG. 2 , the lithium battery pack 400 is divided into two groups, including a first lithium battery pack and a second lithium battery pack.

Wherein, the PLC main controller 150 can be a programmable logic controller (Programmable Logic Controller, PLC). The rectifier power distribution cabinet 110, the chopper cabinet 120 and the inverter power cabinet 130 constitute a DC power distribution board. The DC network ship hybrid power laboratory needs to include power generation equipment such as diesel generator sets 200, energy storage equipment such as lithium battery packs 400, propulsion equipment such as propulsion motors 500, daily load equipment such as electric loads, shore-based charging equipment, etc. In order to meet the experimental goal of ship mixing. Among them, the power grid in the factory area is used to simulate the shore power. The state acquisition module 140 is provided with different state acquisition units according to different types of equipment. Exemplarily, the state acquisition module 140 includes: a unit management unit and a battery management system, the unit management unit is configured in the diesel generator set 200; the battery management system is configured in Lithium battery pack 400.

Correspondingly, the entire power core system demonstration and verification platform controlled by the energy management system is composed of the following subsystems: diesel generator set 200 system; DC power distribution system; energy storage system; electric propulsion system; shore-based charging system; daily load system ; Energy management control system. Exemplarily, the diesel generator set 200 system includes a diesel generator, a unit management unit, and a controller; the energy storage system includes a lithium battery pack 400, a battery management system, and a controller; the electric propulsion system includes a variable frequency motor and an eddy current dynamometer 800 , constitute the propulsion system after inverter (frequency converter) + frequency conversion motor + eddy current dynamometer 800 mode. Among them, the diesel generator set 200 system provides the power source for the entire power system, and the output power and output voltage of the diesel generator set 200 in the hybrid core system determine the design scale of the entire hybrid core system and the ship types that can be covered. Exemplarily, two 500kW, 690V diesel generator sets 200 are used as power sources in the DC networked ship hybrid laboratory; the voltage of the first DC bus 300 in the DC power distribution system is 1000V DC.

The rectifier power distribution cabinet 110 includes a generator rectifier, which is connected between the diesel generator set 200 and the first DC bus 300 , rectifies the AC power generated by the diesel generator set 200 , and outputs 1000VDC to the first DC bus 300 . The rectifier power distribution cabinet 110 also includes a grid-side rectifier, which is connected between the power grid in the factory area and the first DC bus 300, and is set to simulate the situation of connecting to shore power when a ship is in port, and uses the grid-side rectifier to convert 690V AC power to 1000V direct current.

The chopper cabinet 120 includes a bidirectional DC/DC converter, and the bidirectional DC/DC converter is connected between the lithium battery pack 400 and the first DC bus 300 to complete the charging and discharging process of the lithium battery pack 400 and other energy storage devices. The control of the main controller 150 prevents overcharging and overdischarging. The lithium battery pack 400 mainly plays the role of peak shaving and valley filling. When the power system load fluctuates, it can absorb or release energy instantaneously, enhance system stability and make the hybrid system work at an economical operating point. Exemplarily, two lithium battery packs 400 are used, each pack has an electric capacity of 160kWh, and a charge and discharge rate of 1C.

The inverter power supply cabinet 130 includes a propulsion motor 500 inverter, and the propulsion motor 500 inverter is connected between the first DC bus 300 and the propulsion motor 500. Exemplarily, the propulsion motor 500 is a variable frequency motor, and the propulsion motor 500 is inverter The inverter controls the speed and torque of the variable frequency motor through the control of the PLC main controller 150 . The power inverter cabinet 130 also includes a daily load inverter connected between the first DC bus 300 and the second DC bus 600 . Exemplarily, the daily load inverter is to invert 1000V direct current into 380V 50Hz fixed voltage/frequency alternating current, simulating the daily load on board.

The functions of the energy management system are: the main functions of the control are power regulation and load distribution, so as to realize the load balance between the power supply side and the load side, and ensure the stable operation of the power grid. With load status monitoring, inverter status monitoring, overvoltage and undervoltage monitoring, overcurrent monitoring, power generation unit fault monitoring, lithium battery power monitoring, lithium battery charging indication, power limit, unloading, heavy load inquiry, fault cutoff, emergency functions such as shutdown.

Exemplarily, the control method of the energy control system is to collect the operation information of the diesel generator set 200, the lithium battery pack 400, the supercapacitor, the propulsion motor 500, the power grid of the factory area, the first DC bus 300 and the second DC bus 600; According to the operation information, the control control system is in at least one of the following operation modes: pure electric mode, single diesel engine hybrid mode, dual diesel engine hybrid mode, single diesel engine mode switching and dual diesel engine mode.

In the embodiment of the present application, by setting the energy control system of the DC network ship hybrid laboratory, including: rectifier power distribution cabinet 110, chopper cabinet 120, inverter power cabinet 130, state acquisition module 140 and PLC main controller 150, the realization of Multi-energy access, intelligent control of power management and distribution for DC networked ship hybrid laboratory. For example, comprehensive energy management can be performed on diesel generator set 200, energy storage equipment, rectifier power distribution cabinet 110, inverter power cabinet 130, chopper cabinet 120, propulsion motor 500, and electrical loads, realizing the hybrid power of the entire ship. The energy distribution in the laboratory is more optimized, and the energy conversion is more efficient.

Continuing to refer to FIG. 2 , on the basis of the above embodiments, for example, the energy control system of the DC networked ship hybrid laboratory also includes a transformer A00; the rectifier distribution cabinet 110 is electrically connected to the factory power grid through the transformer A00.

Continuing to refer to FIG. 2, on the basis of the foregoing embodiments, for example, the power inverter cabinet 130 and the second DC bus 600 are electrically connected through a transformer A00; Also set up to simulate an emergency generator set.

Continuing to refer to Fig. 2, on the basis of the above-mentioned embodiments, for example, the energy control system of the DC networking ship hybrid laboratory also includes: a third DC bus, connected between the second DC bus 600 and the control circuit; uninterrupted The power supply is electrically connected to the second DC bus 600 . For example, the third DC bus is electrically connected to the second DC bus 600 through a transformer A00. Wherein, the third DC bus and the transformer A00 constitute an AC distribution board.

Continuing to refer to FIG. 2 , on the basis of the above-mentioned embodiments, for example, the load box is used to simulate the AC load of the ship, and the daily load characteristics of the ship can be truly restored through the resistance-inductive load box 700 . The motor 900 is used to simulate pumps and valves, thereby simulating the influence of pump and valve activation on the DC power distribution system. In the daily load of ships, there are many power equipment such as pumps and valves. The starting current can reach 5 to 8 times the rated value at the moment of starting, which has a great impact on the DC power distribution system.

Continuing to refer to Fig. 2, on the basis of the above-mentioned embodiments, for example, the energy control system of the DC networked ship hybrid laboratory also includes: a fuse B00 and a circuit breaker C00, which are connected between a plurality of devices and are set to carry out circuit protection and switch.

Fig. 3 is a schematic structural diagram of another energy control system of a DC networked ship hybrid laboratory provided by an embodiment of the present application. Referring to FIG. 3 , on the basis of the above embodiments, for example, the PLC main controller 150 adopts a redundant PLC architecture, that is, two sets of PLC main controllers 150 are used. Two sets of PLC master controllers 150 operate independently and serve as backups for each other. One set of PLC master controller 150 performs the function of the master controller, and the other set of PLC master controller 150 keeps running as a standby controller. Once the main controller fails, the standby controller will be automatically switched to the main controller. This setting improves the stability and reliability of the DC networked ship hybrid laboratory operation.

On the basis of the above embodiments, for example, the energy control system of the DC networked ship hybrid laboratory further includes: an analog input module, an analog output module, a digital input module and a digital output module. Wherein, both the analog input module and the digital input module are electrically connected to the input end of the PLC main controller 150 , and are configured to match the analog and digital outputs output by the state acquisition module 140 with the PLC main controller 150 . Both the analog quantity output module and the digital quantity output module are electrically connected to the output terminal of the PLC main controller 150, and are configured to convert the signal output by the PLC main controller 150 into analog and digital quantities matching the controlled equipment. Such setting improves the reliability of transmission of operation information and control signals.

On the basis of the above embodiments, for example, each diesel generator is equipped with an independent unit management module to provide protection for the diesel generator. At the same time, the parameters such as the voltage and frequency of the diesel generator are independently monitored. If faults such as high voltage, low voltage, high frequency, and low frequency occur in a certain diesel generator in operation, the PLC main controller 150 performs automatic tripping control of the main switch of the corresponding faulty diesel generator set.

On the basis of the above-mentioned embodiments, for example, each group of energy storage systems is equipped with a BMS system (Battery Management System, battery management system) to provide protection for the energy storage battery system, and to control the voltage, current, temperature, power, SOC ( Super Capacitor State Of Charge, Super Capacitor State Of Charge) and other parameters are monitored. If a certain group of batteries in operation fails, the PLC main controller 150 will automatically exit the operation of the corresponding failure lithium battery group.

Fig. 4 is another energy control system for a DC networked ship hybrid laboratory provided by an embodiment of the present application. Referring to FIG. 4 , on the basis of the above-mentioned embodiments, for example, the energy control system of the DC networked ship hybrid laboratory further includes a human-machine interface interaction device 160 . The man-machine interface interaction device 160 is electrically connected with the PLC main controller 150; the man-machine interface interaction device 160 is set to carry out the engineering production management system control operation, parameter setting, running state and alarm display function according to the signal of the PLC main controller 150 at least one. Exemplarily, the man-machine interface interaction device 160 is arranged on the central control console, and can perform related PMS (Power Production Management System, engineering production management system) control operations, parameter settings, operating status and alarm display.

On the basis of the foregoing embodiments, for example, the PLC master controller 150 communicates with the controlled device through at least one of the following communication interfaces: Ethernet communication interface module, CAN communication interface module and industrial field bus protocol communication interface module for real-time synchronous communication. Exemplarily, the two sets of PLC main controllers 150 are connected by optical fiber and internal private protocol to realize redundant configuration of the main controllers. The PLC main controller 150 and the DC power distribution cabinet controller (including the rectifier power distribution cabinet 110, the chopper cabinet 120, and the inverter power cabinet 130) adopt an industrial field bus protocol, such as the Modbus-TCP communication protocol, and use an RJ45 interface. The PLC main controller 150 and the energy storage system controller adopt a controller area network protocol (Controller Area Network, CAN), that is, a CAN communication protocol. The CAN communication protocol is adopted between the chopper cabinet 120 and the energy storage system controller. The industrial field bus protocol, such as Modbus-RTU (485) communication protocol, is adopted between the PLC main controller 150 and the diesel generator set system controller. The PLC master controller 150 and the man-machine interface interaction device 160 adopt B&R proprietary protocol and the like.

On the basis of the above embodiments, for example, the energy control system reserves a certain spare signal output and input interface, so as to expand and upgrade or replace the control program.

In summary, the embodiment of the present application sets a redundant PLC main controller 150, an analog input module, an analog output module, a digital input module, a digital output module, an Ethernet communication interface module, a CAN communication interface module, and the like. The energy control system adopts a redundant PLC architecture, which mainly communicates with multiple devices through Ethernet to collect data from diesel generator sets, lithium battery packs, supercapacitors, power grids in the factory area, DC power distribution boards, AC power distribution boards, propulsion motors, power The operation information and status information of equipment such as eddy current dynamometers mainly include analog quantities such as voltage and current of multiple equipment and digital quantities of switch status, etc. Finally, through calculation and analysis, the analysis data results are exchanged to multiple equipment through Ethernet, Complete data communication and control.

For example, the PLC main controller 150 in the energy management cabinet collects information such as the operation, shutdown, and status of the electrical equipment of the entire ship, collects the voltage and current flowing through each switch, and can control the opening and closing of switches on all AC distribution boards , so as to realize the module including pure electric mode switching to other modes, single diesel engine hybrid mode switching to other modes, dual diesel engine hybrid mode switching to other mode modules, single diesel engine mode switching to other mode modules and dual diesel engine mode Switches to the control method of the remaining mode modules.

The embodiment of the present application also provides a control method for the energy control system of the DC networked ship hybrid laboratory, and the control method is applicable to the energy control system of the DC networked ship hybrid laboratory provided in any embodiment of the present application , with corresponding beneficial effects.

Fig. 5 is a schematic flowchart of a control method for an energy control system of a DC networked ship hybrid laboratory provided by an embodiment of the present application. Referring to Figure 5, the control method of the energy control system of the DC networked ship hybrid laboratory includes the following steps:

S110. Collect the operation information of the diesel generator set, the lithium battery pack, the supercapacitor, the propulsion motor, the power grid in the factory area, the first DC bus and the second DC bus.

S120. According to the operation information, control the control system to be in at least one of the following operation modes: pure electric mode, single diesel engine hybrid mode, dual diesel engine hybrid mode, single diesel engine mode, and dual diesel engine mode.

On the basis of the above-described embodiments, for example, before the collection step, it also includes: power-on detection, including software self-test and hardware self-test; judging whether the bus voltage is established; based on the judgment result that the bus voltage has been established, perform subsequent steps, based on If the judgment result that the bus voltage has not been established, execute the step of establishing the bus voltage. FIG. 6 is a schematic flowchart of another control method for an energy control system of a hybrid laboratory of a DC networked ship provided by an embodiment of the present application. Referring to Fig. 6, for example, the control method includes the following steps: enter the program; software self-test, if the self-test result is normal, then perform hardware self-test, if the software self-test result is abnormal, report an error and jump out; if the hardware self-test result is normal, Then judge whether the first bus voltage is established, if the hardware self-test result is abnormal, report an error and jump out; if the first bus voltage is established, enter the main logic program, if the first bus voltage is not established, establish the bus voltage; jump out from the main logic control Finally, judge whether to stop, if it stops, then jump out, if not, re-enter.

On the basis of the above-mentioned embodiments, for example, the operation mode also includes: engineering production management system mode and shore power mode; wherein, the engineering production management system mode includes automatic mode, semi-automatic mode and manual mode; in automatic mode, the control system The operating mode realizes automatic switching; in the semi-automatic mode, the operating mode of the control system realizes manual-assisted automatic switching; in the manual mode, the operating mode of the control system realizes manual switching. FIG. 7 is a schematic flowchart of a main logic control method provided by an embodiment of the present application. Referring to Fig. 7, for example, this control method comprises the following steps: entering program; Judging whether it is an automatic mode, based on the judgment result of the automatic mode, judging whether to start for the first time, based on the judgment result of not the automatic mode, judging whether it is a semi-automatic mode; If the judging result is the first startup, then the second power mode is automatically selected; based on the judging result that is not the first startup, the first power mode is automatically selected; Judgment result, judge whether it is manual mode; after automatic selection of the first power mode, automatic selection of the second power mode or manual selection of the power mode, automatic power distribution, information processing and uploading and jumping out; based on manual mode Based on the judging result of the shore power mode, process information and upload it, and jump out. Based on the judging result that it is not manual mode, judge whether it is the shore power mode; based on the judging result of the shore power mode, enter the shore power logic, process information and send it. And jump out; based on the judgment result that it is not the shore power mode, perform information processing and upload, and jump out.

Among them, the automatic selection of the first power supply mode, the automatic selection of the second power supply mode, and the manual selection of the power supply mode all include switching from pure electric mode to other modes, switching from single diesel engine hybrid mode to other modes, and switching from dual diesel engine hybrid mode to The remaining modes, switching from the single diesel engine mode to the remaining modes, and switching from the dual diesel engine mode to the remaining modes can be set as required in practical applications. In the embodiment of the present application, by setting operation modes such as automatic mode, semi-automatic mode, and manual mode, the start-stop, grid-connected, and off-grid control of power generation units such as diesel generator sets can be performed according to load conditions, so as to achieve a relatively economical and reasonable operation mode. Among them, the semi-automatic mode and the manual mode require professional operators to operate, for example, they can be displayed and operated through a man-machine interface, using a touch screen.

On the basis of the above embodiments, for example, the operating conditions of the pure electric mode include: the state of charge of the supercapacitors of the two lithium battery packs are respectively greater than the first set value, and the system electric load power is less than the second set value;

And/or, the operating conditions of the single diesel engine mode include: the states of charge of the supercapacitors of the two lithium battery packs are respectively less than the first set value, and the system electric load power is less than the second set value;

And/or, the operating conditions of the dual diesel engine mode include: the states of charge of the supercapacitors of the two lithium battery packs are respectively less than the first set value, and the system electric load power is greater than the second set value;

And/or, the operating conditions of the single diesel engine hybrid mode include: the state of charge of the supercapacitor of the first lithium battery pack is greater than the first set value, and the state of charge of the supercapacitor of the second lithium battery pack is less than the first set value , and the system electric load power is less than the second set value;

And/or, the operating conditions of the dual-diesel-engine hybrid mode include: the states of charge of the supercapacitors of the two lithium battery packs are respectively greater than a first set value, and the system electric load power is greater than a second set value.

Wherein, the first set value and the second set value can be set according to needs, the state of charge of the supercapacitor is SOC, the first set value can be, for example, 10% to 50% of the SOC rated value, and the second set The value may be, for example, 50% to 100% of the system electrical load power rating. Correspondingly, the power mode switching control strategy of the energy control system is:

If the SOC of the two lithium battery packs in the energy storage system is greater than the set value (10% to 50%, which can be set), and the system electric load power is less than the set value (50% to 100%, which can be set), then The system runs in pure electric mode;

If the SOC of the two lithium battery packs in the energy storage system are respectively less than the set value (10% to 50%, can be set), and the system electric load power is less than the set value (50% to 100%, can be set), then The system runs in single diesel engine mode;

If the SOC of the two lithium battery packs in the energy storage system is less than the set value (10% to 50%, which can be set), and the system electric load power is greater than the set value (50% to 100%, which can be set), then The system runs in dual diesel engine mode;

If the SOC of one group of lithium battery packs in the energy storage system is greater than the set value (10% to 50%, which can be set), the SOC of the other set of lithium battery packs is less than the set value (10% to 50%, which can be set ), and the system electric load power is less than the set value (50%~100%, can be set), then the system runs in the single diesel engine hybrid mode;

If the SOC of the two lithium battery packs in the energy storage system is greater than the set value (10% to 50%, can be set), and the system electric load power is greater than the set value (50% to 100%, can be set), then The system runs in dual-diesel-engine hybrid mode;

Switch to shore power mode manually, once switch to shore power mode, other modes will not take effect.

On the basis of the above embodiments, for example, the control method further includes: the berthing/emergency generating set can perform uninterrupted power load transfer when any one of the main power sources (diesel generating sets) is connected to the grid for a short time.

On the basis of the above-mentioned embodiments, for example, the control method further includes: in order to ensure the continuity of power supply under abnormal conditions of the power grid, the steady-state power limit and transient rapid reduction of the propulsion system power are performed according to the load rate of the unit and the switch state , in order to prevent the generator from being overloaded by a sudden load change, resulting in a power outage of the entire ship and affecting the safety of the ship.

Claims

An energy control system for a DC networked ship hybrid laboratory, comprising:

The rectifier power distribution cabinet is connected between the diesel generator set and the first DC bus, and is connected between the power grid in the factory area and the first DC bus;

The chopper cabinet is connected between the lithium battery pack and the first DC bus, and is connected between the supercapacitor and the first DC bus;

The inverter power supply cabinet is connected between the first DC bus and the propulsion motor, and is connected between the first DC bus and the second DC bus; wherein, the second DC bus is set to Electric load power supply;

The state acquisition module is connected with the diesel generator set, the lithium battery pack, the supercapacitor, the propulsion motor, the power grid in the plant area, the first DC bus and the second DC bus, the The state collection module is configured to collect the operation information of the diesel generator set, the lithium battery pack, the supercapacitor, the propulsion motor, the power grid in the plant area, the first DC bus and the second DC bus ;

The programmable logic controller (PLC) main controller includes a signal acquisition input terminal and a control output terminal, and the signal acquisition input terminal is electrically connected to the state acquisition module; the control output terminal is connected to the rectifier power distribution cabinet, the The chopper cabinet is connected to the control terminal of the inverter power cabinet, and the PLC main controller is configured to perform energy control on the diesel generator set, the lithium battery pack and the propulsion motor.
The system according to claim 1, wherein the PLC main controller adopts a redundant PLC architecture.
The system according to claim 1, further comprising: an analog input module, an analog output module, a digital input module and a digital output module;

Wherein, the analog quantity input module and the digital quantity input module are respectively electrically connected to the input terminals of the PLC master controller, and the analog quantity input module is configured to connect the analog quantity output by the state acquisition module with the The PLC master controller is matched, and the digital quantity input module is set to match the digital quantity output by the state acquisition module with the PLC master controller;

The analog output module and the digital output module are respectively electrically connected to the output terminals of the PLC master controller, and the analog input module is configured to convert the signal output by the PLC master controller into The analog quantity matched with the equipment, the digital quantity input module is set to convert the signal output by the PLC main controller into a digital quantity matched with the controlled equipment.
The system according to claim 1, wherein the PLC master controller communicates with the controlled device through at least one of the following communication interfaces: Ethernet communication interface module, controller area network CAN communication interface module, And industrial field bus protocol communication interface module.
The system of claim 1, further comprising:

The man-machine interface interaction device is electrically connected with the PLC main controller; the man-machine interface interaction device is set to perform engineering production management system control operation, parameter setting, operation status and alarm display according to the signal of the PLC main controller at least one of the functions.
The system according to claim 1, wherein the state acquisition module comprises at least one of the following:

A unit management unit, the unit management unit is configured in the diesel generator set;

A battery management system, the battery management system is configured on the lithium battery pack.
The system according to claim 1, further comprising a transformer; the rectifying power distribution cabinet is electrically connected to the power grid in the factory area through the transformer.
The system according to claim 7, wherein the power inverter cabinet and the second DC bus are electrically connected through a transformer;

And, the power grid in the plant area is electrically connected to the second DC bus through the transformer, and the power grid in the plant area is also set to simulate an emergency generating set.
The system of claim 1, further comprising:

The third DC bus is connected between the second DC bus and the control circuit; the uninterruptible power supply is electrically connected to the second DC bus.
A method for controlling the energy control system of the DC networked ship hybrid laboratory as claimed in claim 1, comprising:

Collecting the operation information of the diesel generator set, the lithium battery pack, the supercapacitor, the propulsion motor, the power grid of the plant area, the first DC bus and the second DC bus;

According to the operation information, the control system is controlled to be in at least one of the following operation modes: pure electric mode, single diesel engine hybrid mode, dual diesel engine hybrid mode, single diesel engine mode, and dual diesel engine mode.
The method according to claim 10, wherein the operation mode further comprises: engineering production management system mode and shore power mode;

Wherein, the engineering production management system mode includes automatic mode, semi-automatic mode and manual mode; in the automatic mode, the operating mode of the control system realizes automatic switching; in the semi-automatic mode, the operating mode of the control system realizes Manual-assisted automatic switching; in the manual mode, the operating mode of the control system realizes manual switching.
According to the method according to claim 10, in the collection of the diesel generator set, the lithium battery pack, the supercapacitor, the propulsion motor, the power grid in the plant area, the first DC bus and the Before the operation information of the second DC bus, it also includes:

Power-on detection, including software self-test and hardware self-test;

Judging whether the bus voltage has been established; based on the judgment result that the bus voltage has been established, perform subsequent steps, and based on the judgment result that the bus voltage has not been established, perform the step of establishing the bus voltage.
The method according to claim 10, wherein the lithium battery pack comprises a first lithium battery pack and a second lithium battery pack, and the method satisfies at least one of the following conditions:

The operating conditions of the pure electric mode include: the state of charge of the supercapacitors of the first lithium battery pack and the second lithium battery pack are respectively greater than a first set value, and the system electric load power is less than a second set value ;

The operating conditions of the single diesel engine mode include: the state of charge of the supercapacitors of the first lithium battery pack and the second lithium battery pack are respectively less than the first set value, and the electrical load power of the system is less than said second set value;

The operating conditions of the dual diesel engine mode include: the state of charge of the supercapacitors of the first lithium battery pack and the second lithium battery pack are respectively less than the first set value, and the electrical load power of the system is greater than said second set value;

The operating conditions of the single diesel-engine hybrid mode include: the state of charge of the supercapacitor of the first lithium battery pack is greater than the first set value, and the state of charge of the supercapacitor of the second lithium battery pack is less than the set value. the first set value, and the system electrical load power is less than the second set value; and

The operating conditions of the dual diesel engine hybrid mode include: the state of charge of the supercapacitors of the first lithium battery pack and the second lithium battery pack are respectively greater than the first set value, and the system power load The power is greater than the second set value.