A propulsion and fire fighting combined multi-drive frequency conversion system and control method

Abstract

The present invention relates to a multi-drive frequency conversion system and control method for combined propulsion and firefighting. The system comprises six components: several generator sets (G), several power transmitters (MTRs), a propulsion and firefighting rectifier unit (RCU), a propulsion inverter unit (PNU), a firefighting inverter unit (FNU), and a frequency conversion system controller (PF-SYSTEM-CPU). Compared to independent single-drive propulsion and firefighting systems, the present invention's multi-drive frequency conversion system and control method significantly reduces the total power requirements for propulsion and firefighting, reduces the volume, weight, and cost of propulsion and firefighting frequency conversion equipment, and improves energy utilization and efficiency. Furthermore, it achieves coordinated matching of propulsion and firefighting loads, avoids mutual influence between the propulsion and firefighting frequency conversion loads, and ensures the mobility and firefighting capability requirements of aquatic firefighting equipment under different operating conditions.

Description

Technical Field

[0001] The present invention relates to the field of ship automation, and in particular to a propulsion and fire fighting combined multi-drive frequency conversion system and a control method. Background Art

[0002] With the development of variable frequency speed regulation and automation technology, power frequency conversion technology has been widely used due to its advantages such as small starting current, high energy efficiency, fast speed regulation process, wide range, high precision, and flexible spatial layout. Propulsion, fire fighting and other equipment on ships are also increasingly driven by frequency converters.

[0003] Water-based firefighting equipment is generally equipped with both propulsion equipment and firefighting equipment. Both require fast speed regulation and high precision, and both have the characteristics of frequent load changes and a wide range of load changes. Due to the characteristics of firefighting operations, when rushing to a fire scene or during rescue and transfer, the ship is rapidly propelled and moved to a new position, while the firefighting equipment is in standby operation. At this time, the propulsion load power is high, while the firefighting load power is low. During the firefighting process, the propulsion equipment is used to position or slowly move the ship. At this time, the firefighting load power is high, while the propulsion load power is low.

[0004] At present, the propulsion equipment and fire fighting equipment of water fire fighting equipment often adopt independent single drive frequency conversion mode. In order to ensure that the water fire fighting equipment has sufficient rescue capabilities, the propulsion equipment and fire fighting equipment are selected according to the maximum demand, but there are the following disadvantages:

[0005] 1. The total rated power of the configured propulsion and fire protection inverters is greater than the actual demand, resulting in high costs and poor economic efficiency.

[0006] 2. The configured propulsion and fire-fighting inverters are large in size and heavy in weight.

[0007] 3. The energy utilization and efficiency of the configured propulsion and fire-fighting inverters are low.

[0008] 4. When the power supply margin of the power grid is insufficient, manpower is required to coordinate and match the propulsion load (affecting maneuverability) and the firefighting load (affecting firefighting capability), which makes the operation difficult.

[0009] Therefore, a propulsion and fire fighting combined multi-drive frequency conversion system and control method are invented, which can not only ensure the rescue capability of water fire fighting equipment, improve the energy utilization rate of water fire fighting equipment, reduce the volume, weight and cost of water fire fighting equipment, but also automatically achieve coordinated matching of propulsion load and fire fighting load according to the power grid status and operation mode, which is of great significance to ensure the maneuverability and fire fighting capability of water fire fighting equipment. Summary of the Invention

[0010] The present invention aims to address the shortcomings of existing propulsion and firefighting equipment frequency converters, such as high cost, large volume and weight, and low efficiency, in water firefighting equipment. A propulsion and firefighting combined multi-drive frequency conversion system and control method are proposed.

[0011] To achieve the above object, the technical solution of the present invention is as follows:

[0012] A propulsion and fire protection combined multi-drive frequency conversion system, the system includes several units G, several power transmitters MTR, propulsion & fire protection rectifier units RCU, propulsion inverter units PNU, fire protection inverter units FNU, frequency conversion system controller PF-SYSTEM-CPU,

[0013] The generator set G is used to generate electricity and provide AC power to the propulsion & fire rectifier unit RCU, and output the closing status of the generator set G ON Signal to the frequency conversion system controller PF-SYSTEM-CPU;

[0014] The power transmitter MTR is used to collect the three-phase voltage and three-phase current signals of each unit G, and obtain the actual power signal G of each unit after processing. PWR And output to the frequency conversion system controller PF-SYSTEM-CPU through the fast analog output channel, thus ensuring the actual power signal G of each unit PWR The data acquisition time is less than 50ms;

[0015] The propulsion & fire rectifier unit RCU is used to rectify the AC power input by each unit G into a DC power supply; and take the power level P of the propulsion inverter unit PNU PNU , the power level P of the fire inverter unit FNU FNU The larger of the two is 1.2 times the power level P of the propulsion & fire rectifier unit RCU. RCU ;

[0016] The propulsion inverter unit PNU is used to invert the DC power output by the propulsion & fire rectifier unit RCU3 into AC power to drive the propulsion motor;

[0017] The fire inverter unit FNU is used to invert the DC power output by the propulsion & fire rectifier unit RCU3 into AC power to drive the motor of the fire equipment;

[0018] The frequency conversion system controller PF-SYSTEM-CPU is used to collect the unit switch status G from each unit G. ON Signal, actual power G of each unit from power transmitter MTU PWR Signal, propulsion power command P from external command device CTRL POWER_CMD and fire power instruction F POWER_CMDAfter the signal is received, according to the propulsion priority mode selection P_PRIORY_MODE and fire protection priority mode selection F_PRIORY_MODE instructions given by the operator, the propulsion load limit instruction P is calculated according to the control method of the propulsion and fire protection combined multi-drive frequency conversion system. POWER_LIMIT_CMD and Fire Load Limit Directive F POWER_LIMIT_CMD , and sent to the propulsion inverter unit PNU and the fire inverter unit FNU to prevent the propulsion load or fire load from being overloaded, which would affect the fire extinguishing effect or safety of the target ship.

[0019] Furthermore, the unit G is composed of a prime mover and a generator, and the number of the units G is at least 3; the actual power signal of the unit G is G PWR , rated power value is G RATE_PWR .

[0020] Furthermore, the electrical quantity transmitter MTR adopts DEIF brand MRT-4 programmable transmitter, and the number of the electrical quantity transmitter MTR is at least 3.

[0021] Furthermore, the power level P of the propulsion & fire rectifier unit RCU RCU The actual power P of the propulsion & fire rectifier unit RCU RCU_ACT The difference is the power margin P of the propulsion & fire rectifier unit RCU RCU_MARGIN .

[0022] Furthermore, the frequency conversion system controller PF-SYSTEM-CPU is the core of the propulsion and fire protection combined multi-drive frequency conversion system. The frequency conversion system controller PF-SYSTEM-CPU pre-sets the fire protection maximum power limit F in the propulsion priority mode. PYX_POWER_MAX and the maximum propulsion power limit P in fire-fighting priority mode FYX_POWER_MAX Two parameters.

[0023] A control method for a combined multi-drive frequency conversion system for propulsion and fire protection, wherein the frequency conversion system controller PF-SYSTEM-CPU is configured to control the frequency conversion system according to the G unit brake state G of each unit. ON Signal, actual power G of each unit from power transmitter MTU PWR Signal, propulsion power command P from external command device CTRL POWER_CMD and fire power instruction F POWER_CMD After the signal is given, according to the propulsion priority mode selection P_PRIORY_MODE and fire priority mode selection F_PRIORY_MODE instructions given by the operator, and the propulsion maximum power limit P in the fire priority mode preset in the controller FYX_POWER_MAX and the maximum fire-fighting power limit F in propulsion priority mode PYX_POWER_MAX , calculate the propulsion load limit instruction P POWER_LIMIT_CMDand Fire Load Limit Directive F POWER_LIMIT_CMD , the specific steps of the control method are:

[0024] Step 1: Find all the G ON =1, and calculate the total number N of units in the closed state;

[0025] Step 2: If N=1, then the fire load limit instruction F POWER_LIMIT_CMD =0, prohibiting the operation of fire-fighting equipment, and the power margin P of the grid unit NET_MARGIN All of them are used to ensure that the propeller drives the ship to shift or evacuate, and the power margin P of the on-grid unit NET_MARGIN Refers to the rated power Gi of all units on the grid RATE_PWR The sum of the actual power Gi of all the units on the grid PWR The difference between the sum of the propulsion load limit command P POWER_LIMIT_CMD Take the propulsion power command P from the external command device CTRL POWER_CMD , the power level P of the propulsion inverter unit PNU PNU , propulsion load current power P P_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value of the sum of the three;

[0026] Step 3: If N=2, the propulsion and fire protection combined multi-drive frequency conversion system is forced to the propulsion priority mode P_PRIORY_MODE=1, F_PRIORY_MODE=0; the propulsion load limit instruction P POWER_LIMIT_CMD Take the propulsion power command P from the external command device CTRL POWER_CMD , the power level P of the propulsion inverter unit PNU PNU , propulsion load current power P P_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value of the sum of the three; Fire load limit instruction F POWER_LIMIT_CMD Take the fire power instruction F from the external instruction device CTRL POWER_CMD , Power level P of fire inverter unit FNU FNU , Maximum fire protection power limit F in propulsion priority mode PYX_POWER_MAX , Fire load current power P F_ACT and the power margin P of the grid-connected units NET_MARGIN The sum of the fire load current power P F_ACT Power margin P of propulsion & fire rectifier unit RCU RCU_MARGIN The minimum value among the sum of the five;

[0027] Step 4: If N ≥ 3, the propulsion and fire protection combined multi-drive frequency conversion system can enter the propulsion priority mode or the fire protection priority mode according to the operator's setting.

[0028] Further, in step 4:

[0029] A: When the propulsion priority mode is selected, P_PRIORY_MODE=1,F_PRIORY_MODE=0,the propulsion load limit instruction P POWER_LIMIT_CMD Take the propulsion power command P from the external command device CTRL POWER_CMD , the power level P of the propulsion inverter unit PNU PNU , propulsion load current power P P_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value of the sum of the three; Fire load limit instruction F POWER_LIMIT_CMD Take the fire power instruction F from the external instruction device CTRL POWER_CMD , Power level P of fire inverter unit FNU FNU , Maximum fire protection power limit F in propulsion priority mode PYX_POWER_MAX , Fire load current power P F_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value among the sum of the four;

[0030] B: When the fire priority mode is selected, P_PRIORY_MODE=0, F_PRIORY_MODE=1, the fire load limit instruction F POWER_LIMIT_CMD Take the fire power instruction F from the external instruction device CTRL POWER_CMD , Power level P of fire inverter unit FNU FNU , Fire load current power P F_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value of the sum of the three; propulsion load limit instruction P POWER_LIMIT_CMD Take the propulsion power command P from the external command device CTRL POWER_CMD , the power level P of the propulsion inverter unit PNU PNU , Maximum propulsion power limit P in fire-fighting priority mode FYX_POWER_MAX , propulsion load current power P P_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value among the sum of the four.

[0031] The beneficial effects of the present invention are as follows: a propulsion and firefighting combined multi-drive frequency conversion system comprises six components: several generators (G), several power transmitters (MTRs), a propulsion and firefighting rectifier unit (RCU), a propulsion inverter unit (PNU), a firefighting inverter unit (FNU), and a frequency conversion system controller (PF-SYSTEM-CPU). Compared to independent single-drive systems for propulsion and firefighting, this system significantly reduces the total power requirements for propulsion and firefighting, reduces the volume, weight, and cost of propulsion and firefighting frequency conversion equipment, and improves energy utilization and efficiency. A control method for the propulsion and firefighting combined multi-drive frequency conversion system calculates propulsion power limit and firefighting power limit commands based on the number of generators online and their power margin, the operator's propulsion priority mode selection and firefighting priority mode selection instructions, the propulsion power command and firefighting power command from an external command device, and the current actual power of the propulsion and firefighting loads. This achieves coordinated matching of the propulsion and firefighting loads, ensuring the mobility and firefighting capacity requirements of water-based firefighting equipment under different operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a system structure diagram of the present invention;

[0033] Figure 2 This is a flow chart of the control method of the propulsion and fire fighting combined multi-drive frequency conversion system of the present invention. DETAILED DESCRIPTION

[0034] In order to clearly illustrate the technical features of the present invention, the present invention is further elaborated in detail below through the accompanying drawings and specific implementation methods.

[0035] like Figure 1 As shown in the figure, a propulsion and fire fighting combined multi-drive frequency conversion system of the present invention is composed of six parts: a plurality of units G1, a plurality of power transmitters MTR2, a propulsion & fire fighting rectifier unit RCU3, a propulsion inverter unit PNU4, a fire fighting inverter unit FNU5, and a frequency conversion system controller PF-SYSTEM-CPU6.

[0036] The unit G1 consists of a prime mover and a generator. After generating electricity, the unit G1 provides AC power to the propulsion & fire rectifier unit RCU3 and outputs the closing status of the unit G. ON The signal is sent to the frequency conversion system controller PF-SYSTEM-CPU6. The number of the units G in the propulsion and fire fighting combined multi-drive frequency conversion system is at least 3. The actual power signal of the unit G is G PWR , rated power value is G RATE_PWR .

[0037] The power transmitter MTR2 uses DEIF brand MRT-4 programmable transmitter. The power transmitter MTR2 collects the three-phase voltage and three-phase current signals of each unit G1 and obtains the power signal G of each unit after processing. PWR And output to the frequency conversion system controller PF-SYSTEM-CPU6 through the fast analog output channel, thus ensuring the power signal G of each unit PWR The data acquisition time is less than 50ms. The number of the power transmitters MTR in the propulsion and fire fighting combined multi-drive frequency conversion system is at least 3.

[0038] The propulsion & fire rectifier unit RCU3 rectifies the AC power input by each unit G1 into a DC power supply; the power level P of the propulsion inverter unit PNU4 is taken PNU , the power level P of the fire inverter unit FNU5 FNU The larger of the two is 1.2 times as the power level P of the propulsion & fire rectifier unit RCU3 RCU Power level P of propulsion & fire rectifier unit RCU3 RCU The actual power P of the propulsion & fire rectifier unit RCU3 RCU_ACT The difference is called the power margin P of the propulsion & fire rectifier unit RCU3 RCU_MARGIN .

[0039] The propulsion inverter unit PNU4 converts the DC power output by the propulsion & fire rectifier unit RCU3 into AC power to drive the propulsion motor. PNU Calculated and determined based on the actual propulsion requirements of the target ship.

[0040] The fire inverter unit FNU5 converts the DC power output by the propulsion & fire rectifier unit RCU3 into AC power to drive the fire equipment motor. The power level of the fire inverter unit FNU5 is P FNU Calculated and determined based on the actual fire-fighting equipment requirements of the target ship.

[0041] The controller PF-SYSTEM-CPU6 of the propulsion and fire fighting combined multi-drive frequency conversion system is the core of the propulsion and fire fighting combined multi-drive frequency conversion system. The controller PF-SYSTEM-CPU6 of the propulsion and fire fighting combined multi-drive frequency conversion system collects the unit brake status G from each unit G1. ON Signal, actual power G of each unit from power transmitter MTU2 PWR Signal, propulsion power command P from external command device CTRL7 POWER_CMD and fire power instruction F POWER_CMDAfter the signal is received, according to the propulsion priority mode selection P_PRIORY_MODE and fire protection priority mode selection F_PRIORY_MODE instructions given by the operator, the propulsion load limit instruction P is calculated according to the control method of the propulsion and fire protection combined multi-drive frequency conversion system. POWER_LIMIT_CMD and Fire Load Limit Directive F POWER_LIMIT_CMD , and sent to the propulsion inverter unit PNU4 and the fire inverter unit FNU5 to prevent the propulsion load or fire load from overloading and affecting the firefighting effect or safety of the target ship. The controller PF-SYSTEM-CPU6 of the propulsion and firefighting combined multi-drive frequency conversion system has pre-set the maximum firefighting power limit F in the propulsion priority mode. PYX_POWER_MAX and the maximum propulsion power limit P in fire-fighting priority mode FYX_POWER_MAX Two parameters.

[0042] like Figure 2 The control method of the multi-drive frequency conversion system for propulsion and fire fighting is shown in the flowchart. The control method of the multi-drive frequency conversion system for propulsion and fire fighting is that the controller PF-SYSTEM-CPU6 is based on the state of the G1 unit brake of each unit G ON Signal, actual power G of each unit from power transmitter MTU2 PWR Signal, propulsion power command P from external command device CTRL7 POWER_CMD and fire power instruction F POWER_CMD After the signal is given, according to the propulsion priority mode selection P_PRIORY_MODE and fire priority mode selection F_PRIORY_MODE instructions given by the operator, and the propulsion maximum power limit P in the fire priority mode preset in the controller FYX_POWER_MAX and the maximum fire-fighting power limit F in propulsion priority mode PYX_POWER_MAX , calculate the propulsion load limit instruction P POWER_LIMIT_CMD and Fire Load Limit Directive F POWER_LIMIT_CMD The specific control methods are as follows:

[0043] Step 1: Find all the G ON =1, and calculate the total number N of units G in the closed state.

[0044] Step 2: If N=1, then the fire load limit instruction F POWER_LIMIT_CMD =0, prohibiting the operation of fire-fighting equipment, and the power margin P of the grid unit NET_MARGIN All of them are used to ensure that the propeller drives the ship to shift or evacuate, and the power margin P of the on-grid unit NET_MARGIN Refers to the rated power Gi of all units on the grid RATE_PWR The sum of the actual power Gi of all the units on the grid PWRThe difference between the sum of (the same below); the propulsion load limit instruction P POWER_LIMIT_CMD Take the propulsion power command P from the external command device CTRL7 POWER_CMD , the power level P of the propulsion inverter unit PNU4 PNU , propulsion load current power P P_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value among the sum of the three.

[0045] Step 3: If N=2, the propulsion and fire protection combined multi-drive frequency conversion system is forced to the propulsion priority mode P_PRIORY_MODE=1, F_PRIORY_MODE=0. Propulsion load limit instruction P POWER_LIMIT_CMD Take the propulsion power command P from the external command device CTRL7 POWER_CMD , the power level P of the propulsion inverter unit PNU4 PNU , propulsion load current power P P_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value of the sum of the three; Fire load limit instruction F POWER_LIMIT_CMD Get the fire power instruction F of the external instruction device CTRL7 POWER_CMD , Power level P of fire inverter unit FNU5 FNU , Maximum fire protection power limit F in propulsion priority mode PYX_POWER_MAX , Fire load current power P F_ACT and the power margin P of the grid-connected units NET_MARGIN The sum of the fire load current power P F_ACT The power margin P of the propulsion & fire rectifier unit RCU3 RCU_MARGIN The minimum value among the sum of the five.

[0046] Step 4: If N ≥ 3, the propulsion and fire protection combined multi-drive frequency conversion system can enter the propulsion priority mode or the fire protection priority mode according to the operator's setting.

[0047] A: When the propulsion priority mode is selected, P_PRIORY_MODE=1,F_PRIORY_MODE=0,the propulsion load limit instruction P POWER_LIMIT_CMD Take the propulsion power command P from the external command device CTRL7 POWER_CMD , the power level P of the propulsion inverter unit PNU4 PNU , propulsion load current power P P_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value of the sum of the three; Fire load limit instruction F POWER_LIMIT_CMD Get the fire power instruction F of the external instruction device CTRL7 POWER_CMD , Power level P of fire inverter unit FNU5 FNU, Maximum fire protection power limit F in propulsion priority mode PYX_POWER_MAX , Fire load current power P F_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value among the sum of the four.

[0048] B: When the fire priority mode is selected, P_PRIORY_MODE=0, F_PRIORY_MODE=1, the fire load limit instruction F POWER_LIMIT_CMD Get the fire power instruction F of the external instruction device CTRL7 POWER_CMD , Power level P of fire inverter unit FNU5 FNU , Fire load current power P F_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value of the sum of the three; propulsion load limit instruction P POWER_LIMIT_CMD Take the propulsion power command P from the external command device CTRL7 POWER_CMD , the power level P of the propulsion inverter unit PNU4 PNU , Maximum propulsion power limit P in fire-fighting priority mode FYX_POWER_MAX , propulsion load current power P P_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value among the sum of the four.

Claims

1. A multi-drive frequency conversion system for combined propulsion and firefighting, characterized by: The system includes several units G, several power transmitters MTR, propulsion & fire rectifier unit RCU, propulsion inverter unit PNU, fire inverter unit FNU, frequency conversion system controller PF-SYSTEM-CPU, The generator set G is used to generate electricity and provide AC power to the propulsion & fire rectifier unit RCU, and output the closing status of the generator set G ON Signal to the frequency conversion system controller PF-SYSTEM-CPU; The power transmitter MTR is used to collect the three-phase voltage and three-phase current signals of each unit G, and obtain the actual power signal G of each unit after processing. PWR And output to the frequency conversion system controller PF-SYSTEM-CPU through the fast analog output channel, thus ensuring the actual power signal G of each unit PWR The data acquisition time is less than 50ms; The propulsion & fire rectifier unit RCU is used to rectify the AC power input by each unit G into a DC power supply; and take the power level P of the propulsion inverter unit PNU PNU , the power level P of the fire inverter unit FNU FNU The larger of the two is 1.2 times the power level P of the propulsion & fire rectifier unit RCU. RCU ; The propulsion inverter unit PNU is used to invert the DC power output by the propulsion & fire rectifier unit RCU3 into AC power to drive the propulsion motor; The fire inverter unit FNU is used to invert the DC power output by the propulsion & fire rectifier unit RCU3 into AC power to drive the motor of the fire equipment; The frequency conversion system controller PF-SYSTEM-CPU is used to collect the unit switch status G from each unit G. ON Signal, actual power G of each unit from power transmitter MTU PWR Signal, propulsion power command P from external command device CTRL POWER_CMD and fire power instruction F POWER_CMD After the signal is received, according to the propulsion priority mode selection P_PRIORY_MODE and fire protection priority mode selection F_PRIORY_MODE instructions given by the operator, the propulsion load limit instruction P is calculated according to the control method of the propulsion and fire protection combined multi-drive frequency conversion system. POWER_LIMIT_CMD and Fire Load Limit Directive F POWER_LIMIT_CMD , and sent to the propulsion inverter unit PNU and the fire inverter unit FNU to prevent the propulsion load or fire load from being overloaded, which would affect the fire extinguishing effect or safety of the target ship.

2. The propulsion and fire fighting combined multi-drive frequency conversion system according to claim 1 is characterized in that: The unit G is composed of a prime mover and a generator, and the number of the units G is at least 3; the actual power signal of the unit G is G PWR , rated power value is G RATE _ PWR .

3. The propulsion and fire fighting combined multi-drive frequency conversion system according to claim 1, characterized in that: The electrical quantity transmitter MTR adopts DEIF brand MRT-4 type programmable transmitter, and the number of the electrical quantity transmitter MTR is at least 3.

4. The propulsion and fire fighting combined multi-drive frequency conversion system according to claim 1 is characterized in that: The power level P of the propulsion & fire rectifier unit RCU RCU The actual power P of the propulsion & fire rectifier unit RCU RCU_ACT The difference is the power margin P of the propulsion & fire rectifier unit RCU RCU_MARGIN .

5. The propulsion and fire fighting combined multi-drive frequency conversion system according to claim 1 is characterized in that: The frequency conversion system controller PF-SYSTEM-CPU is the core of the propulsion and fire protection combined multi-drive frequency conversion system. The frequency conversion system controller PF-SYSTEM-CPU pre-sets the fire protection maximum power limit F in the propulsion priority mode. PYX_POWER_MAX and the maximum propulsion power limit P in fire-fighting priority mode FYX_POWER_MAX Two parameters.

6. A control method for a propulsion and fire fighting combined multi-drive frequency conversion system according to any one of claims 1 to 5, characterized in that: The frequency conversion system controller PF-SYSTEM-CPU is based on the G unit switch status G ON Signal, actual power G of each unit from power transmitter MTU PWR Signal, propulsion power command P from external command device CTRL POWER_CMD and fire power instruction F POWER_CMD After the signal is given, according to the propulsion priority mode selection P_PRIORY_MODE and fire priority mode selection F_PRIORY_MODE instructions given by the operator, and the propulsion maximum power limit P in the fire priority mode preset in the controller FYX_POWER_MAX and the maximum fire protection power limit F in propulsion priority mode PYX_POWER_MAX , calculate the propulsion load limit instruction P POWER_LIMIT_CMD and Fire Load Limit Directive F POWER_LIMIT_CMD , the specific steps of the control method are: Step 1: Find all the G ON =1, and calculate the total number N of units in the closed state; Step 2: If N=1, then the fire load limit instruction F POWER_LIMIT_CMD =0, prohibiting the operation of fire-fighting equipment, and the power margin P of the grid unit NET_MARGIN All of them are used to ensure that the propeller drives the ship to shift or evacuate, and the power margin P of the on-grid unit NET_MARGIN Refers to the rated power Gi of all units on the grid RATE_PWR The sum of the actual power Gi of all the units on the grid PWR The difference between the sum of the propulsion load limit command P POWER_LIMIT_CMD Take the propulsion power command P from the external command device CTRL POWER_CMD , the power level P of the propulsion inverter unit PNU PNU , propulsion load current power P P_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value of the sum of the three; Step 3: If N=2, the propulsion and fire protection combined multi-drive frequency conversion system is forced to the propulsion priority mode P_PRIORY_MODE=1, F_PRIORY_MODE=0; the propulsion load limit instruction P POWER_LIMIT_CMD Take the propulsion power command P from the external command device CTRL POWER_CMD , the power level P of the propulsion inverter unit PNU PNU , propulsion load current power P P_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value of the sum of the three; Fire load limit instruction F POWER_LIMIT_CMD Take the fire power instruction F from the external instruction device CTRL POWER_CMD , the power level P of the fire inverter unit FNU FNU , Maximum fire protection power limit F in propulsion priority mode PYX_POWER_MAX , Fire load current power P F_ACT and the power margin P of the grid-connected units NET_MARGIN The sum of the fire load current power P F_ACT and the power margin P of the propulsion & fire rectifier unit RCU RCU_MARGIN The minimum value among the sum of the five; Step 4: If N ≥ 3, the propulsion and fire protection combined multi-drive frequency conversion system can enter the propulsion priority mode or the fire protection priority mode according to the operator's setting.

7. The control method of the propulsion and fire fighting combined multi-drive frequency conversion system according to claim 6, characterized in that: In step 4: A: When the propulsion priority mode is selected, P_PRIORY_MODE=1,F_PRIORY_MODE=0,the propulsion load limit instruction P POWER_LIMIT_CMD Take the propulsion power command P from the external command device CTRL POWER_CMD , the power level P of the propulsion inverter unit PNU PNU , propulsion load current power P P_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value of the sum of the three; Fire load limit instruction F POWER_LIMIT_CMD Take the fire power instruction F from the external instruction device CTRL POWER_CMD , the power level P of the fire inverter unit FNU FNU , Maximum fire protection power limit F in propulsion priority mode PYX_POWER_MAX , Fire load current power P F_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value among the sum of the four; B: When the fire priority mode is selected, P_PRIORY_MODE=0, F_PRIORY_MODE=1, the fire load limit instruction F POWER_LIMIT_CMD Take the fire power instruction F from the external instruction device CTRL POWER_CMD , the power level P of the fire inverter unit FNU FNU , Fire load current power P F_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value of the sum of the three; propulsion load limit instruction P POWER_LIMIT_CMD Take the propulsion power command P from the external command device CTRL POWER_CMD , the power level P of the propulsion inverter unit PNU PNU , Maximum propulsion power limit P in fire-fighting priority mode FYX_POWER_MAX , propulsion load current power P P_ACT and the power margin P of the grid-connected units NET_MARGIN The minimum value among the sum of the four.

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