Multi-working-condition power system comprehensive control technology

Abstract

The invention relates to a multi-working-condition power system comprehensive control technology. Comprising electric power systems which are designed on the two sides of the dredger and are the same in design, the dredger is provided with double rakes, double underwater dredge pumps and double in-cabin dredge pumps, meanwhile, the functions of single-double pump bow blowing, single bow spraying bank arrangement and reserved backfilling are designed, the maximum digging depth of 120 meters and the maximum row spacing of 10 kilometers are achieved, and the dredger is a drag suction dredger with the strongest Asian comprehensive capacity at present. The scale, layout and configuration of the power system are determined by comprehensively considering factors such as dredging working conditions, geographical environments, load conditions, power supply, energy consumption and environmental protection requirements and designing for meeting existing and future load requirements, and different power distribution control modes are provided for different working conditions, so that the power distribution control system is suitable for different working conditions. The power reserve allowance of the marine main engine is fully utilized, the purpose of saving energy is achieved, the shaft generator is adopted for supplying power, the power type of the shaft generator is in a composite transmission mode, and the shaft generator has the advantages of being good in operation economy, low in maintenance cost, capable of improving the environment of a cabin and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of ship power systems, and in particular to a multi-operating-mode power system integrated control technology. Background Art

[0002] The comprehensive integration of the power system on ship power is to convert all the power mechanical energy on board into electricity, and at the same time provide electricity for propulsion and other operating conditions and daily equipment of the whole ship, so as to realize the comprehensive utilization and unified management of energy.

[0003] Trailing suction hopper dredger is the main type of dredging ship. A single ship can complete four dredging operations: digging, loading, transporting and unloading. It has high production efficiency and strong environmental adaptability. With the development of science and technology and economy, there are more options for the configuration of the power system of trailing suction hopper dredger. According to the technical characteristics of the power system of trailing suction hopper dredger, various operating conditions are studied, and the power requirements of propulsion equipment and dredging equipment are analyzed on the basis of reasonable consideration of various main operating conditions; the optimal configuration of power equipment is studied under the premise of ensuring propulsion performance and dredging performance.

[0004] The transmission types of trailing suction hopper vessels are mainly direct transmission, indirect transmission and electric transmission. Direct transmission refers to the single-machine transmission type, which mainly adopts diesel engine one-to-one direct transmission for the propeller, cabin mud pump and high-pressure flushing pump; the hydraulic and thruster systems are electrically driven and integrated into the entire power grid. Indirect transmission refers to the composite transmission type, which is a "one machine and multiple belts" mode. The propellers are mostly adjustable pitch propellers that do not require speed regulation. There are two types of diesel units with propellers and shaft generators, as well as three types of diesel units with propellers, cabin mud pumps and shaft generators. Electric transmission means that the power sources for propulsion and mud dredging of the entire ship are all driven by electricity.

[0005] The main disadvantages of the conventional single-engine transmission type are that there are a large number of diesel engines, the power utilization rate of the diesel engine unit is not high, there is idleness, and the economy is poor. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a comprehensive control technology for a multi-operating-condition power system.

[0007] To solve the above technical problems, the technical solution of the present invention is: a multi-operating-state power system integrated control technology, the innovation of which is: including an AC main power supply system on a ship, which is equally distributed on both sides of the ship, and the ship is provided with a double rake; Two 14400kW main diesel generator sets and a 1250kW stern thruster are arranged on the bottom floor of the engine room at the stern. Each main diesel generator set is connected to two shaft-belt generators respectively. A 1250kW stern thruster is connected between the main propulsion gearbox and the adjustable propeller. Two 1500kW auxiliary generators and a control room are installed on the stern of the engine room platform 2. A 400V stern main switchboard is installed in the control room. A 6.6kV medium-voltage switchboard is installed on the left and right chords of the engine room platform 2. Two shaft generators include a left shaft generator and a right shaft generator, which are connected to a 6.6kV medium-voltage switchboard respectively. The stern is also equipped with a stern thruster motor, a left auxiliary generator, and a right auxiliary generator; The main power equipment at the bow is concentrated in the bow inverter room and the bow transformer room. Based on the principle of proximity, the power equipment serving the cabin mud pump, high-pressure flushing pump, and bow thruster are arranged nearby to facilitate wiring and control. The bow is equipped with a 400V bow power distribution board, a bow PLC cabinet, a left cabin mud pump, a right cabin mud pump, a left underwater mud pump, a right underwater mud pump, a left cabin mud pump power switch cabinet, a right cabin mud pump power switch cabinet, a left high-pressure flushing pump, No. 1 bow thruster motor, a right high-pressure flushing pump, and No. 2 bow thruster motor. The left cabin mud pump motor of the left cabin mud pump and the left underwater mud pump motor of the left underwater mud pump are connected to the left cabin mud pump power switch cabinet, and the right cabin mud pump motor of the right cabin mud pump and the right underwater mud pump motor of the right underwater mud pump are connected to the right cabin mud pump power switch cabinet. A main transformer is connected between the 400V stern main switchboard and a 6.6kV medium voltage switchboard, and between the 400V bow switchboard and another 6.6kV medium voltage switchboard, and the 400V bow switchboard is connected to the 400V stern main switchboard; The stern thruster motor, No. 1 bow thruster motor, the left high-pressure flushing pump motor of the left high-pressure flushing pump, and the mud pump power switch cabinet in the left cabin are all connected to the left 6.6kV medium-voltage switchboard of the second platform of the engine room; The above structure has different power distribution control modes for different operating conditions: Double-sided mud pump dredging mode: Two shaft generators are used to generate power in different areas: two shaft generators supply power to two 6.6kV switchboard buses respectively, the 6.6kV switchboard bus contact switch is open, two main transformers are working, and the 400V stern main switchboard bus contact switch is open; the two auxiliary generators are not working. Within the dredging depth of 45m, the cabin mud pump or underwater mud pump can be used for double-rake dredging operations.

[0008] Double-sided mud pump dredging power increase mode: Two shaft generators + two auxiliary generators are used for power supply: the two shaft generators supply power to two 6.6kV switchboard buses respectively, and the 6.6kV switchboard bus contact switch is open; the 400V stern main switchboard bus switch is closed, and the two auxiliary generators supply power, and the two main transformers do not work. When the dredging depth exceeds 45m but less than 70m, the underwater pump double rake dredging operation is adopted by connecting the rake pipe. In addition, the deep-sea trench excavation and backfilling functions can be realized through the pump room pipeline.

[0009] Single side dredging mode - port side: The left shaft generator is used for power supply: the left shaft generator supplies power to the 6.6kV switchboard busbar, the left 6.6kV switchboard busbar contact switch is closed; the two main transformers are working, the 400V stern main switchboard busbar contact switch is open; the two auxiliary generators are not working. When the dredging depth is greater than 70m, the starboard rake pipe is extended, and the underwater mud pump is connected in series with the mud pump in the left cabin for single rake dredging operation.

[0010] Single-side dredging mode - starboard: The power supply is provided by shaft-driven generators: the right shaft-driven generator supplies power to the right 6.6kV switchboard bus, and the 6.6kV switchboard bus interconnector is closed; the two main transformers are working, and the 400V stern main switchboard bus interconnector is open; the two auxiliary generators are not working.

[0011] Single-side mud blowing mode in power saving mode - port side: The left shaft generator + 2 auxiliary generators are used for power supply: the left shaft generator supplies power to the 6.6kV switchboard bus, and the 6.6kV switchboard bus contact switch is closed; the 400V stern main switchboard bus contact switch is closed, and the power is supplied by 2 auxiliary generators, the 2 main transformers do not work, and the right shaft generator does not work. Any one cabin mud pump or two cabin mud pumps can be connected in series, and the mud in the mud tank can be pumped to the shore through the tank pumping system and the bow blowing shore joint connected to the floating pipe. At this time, the ship is in anchoring or dynamic positioning DP state.

[0012] Single-side mud blowing mode in power saving mode - starboard: The right shaft generator + 2 auxiliary generators are used for power supply: the right shaft generator supplies power to the 6.6kV switchboard bus, and the 6.6kV switchboard bus contact switch is closed; the 400V stern main switchboard bus contact switch is closed, and the power is supplied by 2 auxiliary generators, the 2 main transformers do not work, and the left shaft generator does not work. Any one cabin mud pump or two cabin mud pumps can be connected in series, and the bow spray operation can be realized through the bow nozzle and the tank pumping system. At this time, the ship is in anchoring or dynamic positioning DP state.

[0013] Full speed or parking mode: Power supply by auxiliary generators: 1 or 2 auxiliary generators supply power, 400V stern main switchboard busbar tie switch is closed; 2 shaft generators do not work, 2 main transformers do not work. During free navigation, the power demand of all 400V auxiliary equipment, when the 6.6kV switchboard of the main power supply fails and causes the 400V busbar to lose power, the auxiliary generator will automatically start and supply power to the 400V stern main switchboard; in the shore discharge condition, the auxiliary generator operates according to the power grid demand and supplies power to the 400V stern main switchboard. The auxiliary generator can be used as a generator for mooring in the port.

[0014] Furthermore, the stern thrust inverter and the stern thrust transformer are connected between the left 6.6kV medium-voltage distribution board and the stern thrust motor, the No. 1 bow thrust inverter and the No. 1 bow thrust transformer are connected between the left 6.6kV medium-voltage distribution board and the No. 1 bow thrust motor, the left high-pressure flushing water pump inverter and the left high-pressure flushing water pump transformer are connected between the left 6.6kV medium-voltage distribution board and the left high-pressure flushing water pump motor, and the left mud pump transformer and the left mud pump inverter are connected between the left 6.6kV medium-voltage distribution board and the mud pump power switching cabinet in the left cabin.

[0015] Furthermore, the main diesel generator set is also connected to a main propulsion gearbox.

[0016] Furthermore, a left pre-charging power cabinet, a fuel supply unit and a right pre-charging power cabinet are also installed on the stern; The left pre-charging power supply cabinet is connected to the left 6.6kV medium-voltage distribution board, and the left pre-charging magnetizing transformer is connected between the left 6.6kV medium-voltage distribution board and the left pre-charging power supply cabinet. The right pre-charging power supply cabinet is connected to the right 6.6kV medium-voltage distribution board, and the right pre-charging magnetizing transformer is connected between the right 6.6kV medium-voltage distribution board and the right pre-charging power supply cabinet.

[0017] Furthermore, there is also a power distribution control mode: Emergency mode: The emergency generator and the emergency switchboard are connected to the 400V stern main switchboard, and the emergency generator supplies power to the emergency switchboard. The bus tie switch from the emergency switchboard to the 400V stern main switchboard is open. It meets the power requirements of the whole ship's emergency power and an emergency hydraulic pump under navigation and dredging conditions as specified by the classification society and relevant authorities. In addition, when the normal 400V power supply fails, the emergency generator automatically starts to supply power to the emergency switchboard. When the normal 400V power supply is restored after the power failure, the generator can be connected in parallel with the auxiliary generator for a short time through the tie switch to transfer the load.

[0018] Furthermore, the adjustable propeller uses an adjustable pitch propeller device, which is more energy-efficient than a fixed pitch propeller under continuous full-load operation conditions.

[0019] Furthermore, considering that the total harmonic distortion (THD) on board does not exceed 4% and the single harmonic distortion does not exceed 3%, the left high-pressure flushing pump inverter and the left mud pump inverter can adopt a 24-pulse frequency conversion system, and other inverters use 12 pulses.

[0020] The advantages of the present invention are: 1. The vessel is equipped with double dredgers, double underwater mud pumps and double in-cabin mud pumps, which are used for loading and draining to the shore respectively, maximizing the working efficiency of the mud pumps; at the same time, it is designed with single and double pump bow blowing, single bow spraying to the shore and reserved backfilling functions, with a maximum dredging depth of 120 meters and a maximum drainage distance of 10 kilometers. It is currently the most powerful trailing suction dredger in Asia.

[0021] 2. The present invention comprehensively considers the dredging conditions, geographical environment, load conditions, power supply, energy consumption, environmental protection requirements and other factors, as well as the design to meet the existing and future load requirements, so as to determine the scale, layout and configuration of the power system, and has different distribution control modes for different operating conditions, making full use of the power reserve margin of the ship's main engine, achieving the purpose of energy saving, and adopting shaft belt generator for power supply. Its power type adopts a composite transmission form, which has the advantages of good operating economy, low maintenance cost and improved engine room environment. The number of diesel engines is reduced relative to the single-machine transmission type. The mud tank area and the engine room area are arranged at the bow and stern of the ship respectively, which can also increase the balance and dredging capacity of the ship, laying the foundation for optimizing the cabin layout; the mud pump, high-pressure flushing pump, side thrust motor, etc. are connected to the 6.6kV medium-voltage distribution board, which not only solves the problem of long-distance transmission of high-power shaft belt generators, but also reduces the difficulty of manufacturing electrical components in the medium-voltage system and the difficulty of cable laying, thereby reducing the cost of ship construction. At the same time, considering the impact of harmonics on the ship, the frequency converter can use 12 pulses. For low-power equipment, phase-shifting transformers can be used to reduce the number of transformers. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a partial structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0023] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0024] like Figure 1 A multi-operating-state power system integrated control technology is shown, including an AC main power system on a ship, which is distributed equally on both sides of the ship, and a double rake is provided on the ship; Two 14400kW main diesel generator sets 1 and a 1250kW stern thruster 5 are arranged on the bottom floor of the engine room at the stern of the ship. Each main diesel generator set 1 is connected to two shaft-belt generators 3 respectively. A 1250kW stern thruster 5 is connected between the main propulsion gearbox 2 and the adjustable propeller 4. The main diesel generator set 1 is also connected to the main propulsion gearbox 2.

[0025] The adjustable propeller 4 uses an adjustable pitch propeller device, which is more energy-efficient than a fixed pitch propeller under continuous full-load operation conditions.

[0026] Two 1500kW auxiliary generators and a control room are installed on the stern of the engine room platform 2. A 400V stern main switchboard is installed in the control room. A 6.6kV medium-voltage switchboard is installed on the left and right chords of the engine room platform 2. Two shaft generators 3 include a left shaft generator and a right shaft generator, which are respectively connected to a 6.6kV medium-voltage switchboard; The stern is also equipped with a stern thruster motor, a left auxiliary generator, and a right auxiliary generator; The stern is also equipped with a left pre-charging power cabinet, a fuel supply unit and a right pre-charging power cabinet; The left pre-charging power supply cabinet is connected to the left 6.6kV medium-voltage distribution board, and the left pre-charging magnetizing transformer is connected between the left 6.6kV medium-voltage distribution board and the left pre-charging power supply cabinet. The right pre-charging power supply cabinet is connected to the right 6.6kV medium-voltage distribution board, and the right pre-charging magnetizing transformer is connected between the right 6.6kV medium-voltage distribution board and the right pre-charging power supply cabinet.

[0027] The main power equipment at the bow is concentrated in the bow inverter room and the bow transformer room. Based on the principle of proximity, the power equipment serving the cabin mud pump, high-pressure flushing pump, and bow thruster are arranged nearby to facilitate wiring and control. The bow is equipped with a 400V bow power distribution board, a bow PLC cabinet, a left cabin mud pump, a right cabin mud pump, a left underwater mud pump, a right underwater mud pump, a left cabin mud pump power switch cabinet, a right cabin mud pump power switch cabinet, a left high-pressure flushing pump, No. 1 bow thruster motor, a right high-pressure flushing pump, and No. 2 bow thruster motor. The left cabin mud pump motor of the left cabin mud pump and the left underwater mud pump motor of the left underwater mud pump are connected to the left cabin mud pump power switch cabinet, and the right cabin mud pump motor of the right cabin mud pump and the right underwater mud pump motor of the right underwater mud pump are connected to the right cabin mud pump power switch cabinet. The stern thruster frequency converter and the stern thruster transformer are connected between the left 6.6kV medium-voltage distribution board and the stern thruster motor; the No. 1 bow thruster frequency converter and the No. 1 bow thruster transformer are connected between the left 6.6kV medium-voltage distribution board and the No. 1 bow thruster motor; the left high-pressure flushing water pump frequency converter and the left high-pressure flushing water pump transformer are connected between the left 6.6kV medium-voltage distribution board and the left high-pressure flushing water pump motor; the left mud pump transformer and the left mud pump frequency converter are connected between the left 6.6kV medium-voltage distribution board and the mud pump power switching cabinet in the left cabin.

[0028] Taking into account the problem that the total harmonic distortion (THD) on board does not exceed 4% and the single harmonic distortion does not exceed 3%, the left high-pressure flushing pump inverter and the left mud pump inverter can adopt a 24-pulse frequency conversion system, and other inverters use 12 pulses.

[0029] A main transformer is connected between the 400V stern main switchboard and a 6.6kV medium voltage switchboard, and between the 400V bow switchboard and another 6.6kV medium voltage switchboard, and the 400V bow switchboard is connected to the 400V stern main switchboard; The stern thruster motor, No. 1 bow thruster motor, the left high-pressure flushing pump motor of the left high-pressure flushing pump, and the mud pump power switch cabinet in the left cabin are all connected to the left 6.6kV medium-voltage switchboard of the second platform of the engine room; The AC main power system, the left shaft generator on the left side of the ship supplies power to the left mud pump transformer (left cabin pump and left underwater pump), left high-voltage flushing pump transformer, No. 1 bow thruster transformer, stern thruster transformer, and left main transformer; the same is true on the right side of the ship. The ship is also equipped with an AC low-voltage auxiliary power system to supply power to the hydraulic equipment, auxiliary equipment, water sealing equipment, emergency equipment and shore power of the entire ship. The power demand of the low-voltage auxiliary equipment of the entire ship is met by the corresponding 6.6kV main power supply obtained through the main transformer or by the auxiliary generator.

[0030] In addition, multiple UPS power systems are configured to supply power to the 6.6kV distribution board, variable frequency drive control system, cabin automation system, dredging control system, etc.

[0031] Each variable frequency drive control system has its own independent PLC control cabinet. Each control system collects various position and status signals of its own system sensors and equipment, displays and provides safety protection, executes the control instructions issued by the control system, and feeds back the on-site execution status to the control system.

[0032] The variable frequency drive control system PLC cabinet communicates with the dredging control system through the network, and uses TCP / IP or PROFINET communication to transmit the alarm signals and parameter status of the mud pump, high-pressure flushing pump, sealing pump and thruster to the ship-wide monitoring alarm system or power management PMS system for status monitoring. In the event of a power failure and power failure, after power is restored, important loads and various pumps serving the main engine can be automatically started in sequence and in stages. The start and stop signals received by all starter units from the PMS should be 24V active contacts, and relays should be used in the starter to convert them into passive contacts to access the starter's control circuit. Important motors in power stations, variable frequency drive auxiliary systems, security systems, etc., including exhaust and supply fans, should be able to be remotely controlled through the PMS or dredging control system.

[0033] The above structure has different power distribution control modes for different operating conditions: Mode 1: Double-sided mud pump dredging mode: Two shaft generators 3 are used to generate power in different areas: two shaft generators 3 supply power to two 6.6kV switchboard buses respectively, the 6.6kV switchboard bus contact switch is open, two main transformers work, and the 400V stern main switchboard bus contact switch is open; the two auxiliary generators do not work. Within the dredging depth of 45m, the cabin mud pump or underwater mud pump can be used for double-rake dredging operations.

[0034] Mode 2: Double-sided mud pump dredging power increase mode: Two shaft generators 3 + two auxiliary generators are used for power supply: two shaft generators 3 supply power to two 6.6kV switchboard buses respectively, and the 6.6kV switchboard bus contact switch is open; the 400V stern main switchboard bus switch is closed, and the two auxiliary generators supply power, and the two main transformers do not work. When the dredging depth exceeds 45m but less than 70m, the underwater pump double rake dredging operation is adopted by connecting the rake pipe. In addition, the deep-sea trench excavation and backfilling functions can be realized through the pump room pipeline.

[0035] Mode 3: Single-side dredging mode - port side: The left shaft generator 3 is used for power supply: the left shaft generator 3 supplies power to the 6.6kV switchboard bus, and the left 6.6kV switchboard bus contact switch is closed; the two main transformers are working, and the 400V stern main switchboard bus contact switch is open; the two auxiliary generators are not working. When the dredging depth is greater than 70m, the starboard rake pipe is extended, and the underwater mud pump is connected in series with the mud pump in the left cabin for single rake dredging operation.

[0036] Mode 4: Single-side dredging mode - starboard: The power supply is provided by shaft-driven generator 3: the right shaft-driven generator supplies power to the right 6.6kV switchboard bus, and the 6.6kV switchboard bus interconnection switch is closed; the two main transformers are working, and the 400V stern main switchboard bus interconnection switch is open; the two auxiliary generators are not working.

[0037] Mode 5: Single-side mud blowing mode in power saving mode - port side: The left shaft generator + 2 auxiliary generators are used for power supply: the left shaft generator supplies power to the 6.6kV switchboard bus, and the 6.6kV switchboard bus contact switch is closed; the 400V stern main switchboard bus contact switch is closed, and the power is supplied by 2 auxiliary generators, the 2 main transformers do not work, and the right shaft generator does not work. Any one cabin mud pump or two cabin mud pumps can be connected in series, and the mud in the mud tank can be pumped to the shore through the tank pumping system and the bow blowing shore joint connected to the floating pipe. At this time, the ship is in anchoring or dynamic positioning DP state.

[0038] Mode 6: Single-side mud blowing mode in power saving mode - starboard: The right shaft generator + 2 auxiliary generators are used for power supply: the right shaft generator supplies power to the 6.6kV switchboard bus, and the 6.6kV switchboard bus contact switch is closed; the 400V stern main switchboard bus contact switch is closed, and the power is supplied by 2 auxiliary generators, the 2 main transformers do not work, and the left shaft generator does not work. Any one cabin mud pump or two cabin mud pumps can be connected in series, and the bow spray operation can be realized through the bow nozzle and the tank pumping system. At this time, the ship is in anchoring or dynamic positioning DP state.

[0039] Mode 7: Full speed sailing or anchoring mode: Auxiliary generators are used for power supply: 1 or 2 auxiliary generators are used for power supply, and the 400V stern main switchboard busbar tie switch is closed; 2 shaft generators 3 are not working, and 2 main transformers are not working. During free navigation, the power demand of all 400V auxiliary equipment is met. When a power supply failure occurs in the 6.6kV switchboard of the main power supply, causing the 400V busbar to lose power, the auxiliary generator will automatically start and supply power to the 400V stern main switchboard; in the shore discharge condition, the auxiliary generator operates according to the power grid demand and supplies power to the 400V stern main switchboard. The auxiliary generator can be used as a generator for mooring in the port.

[0040] Mode 8, Emergency Mode: The emergency generator and the emergency switchboard are connected to the 400V stern main switchboard, and the emergency generator supplies power to the emergency switchboard. The bus tie switch from the emergency switchboard to the 400V stern main switchboard is open. It meets the power requirements of the whole ship's emergency power and an emergency hydraulic pump under navigation and dredging conditions as specified by the classification society and relevant authorities. In addition, when the normal 400V power supply fails, the emergency generator automatically starts to supply power to the emergency switchboard. When the normal 400V power supply is restored after the power failure, the generator can be connected in parallel with the auxiliary generator for a short time through the tie switch to transfer the load.

[0041] Under the above eight operating conditions (except mooring and emergency conditions), in order to achieve the designed ship performance and dredging performance parameter indicators, the estimated loads (unit: kW) of the main power equipment, auxiliary equipment and dredging equipment are shown in the following table.

[0042] .

[0043] From the above table, we can get the following information: the propulsion device and mud pump are the major power consumers, but the loads of these two devices are staggered, making the total power demands relatively close, which provides space for selecting the optimal power configuration plan.

[0044] The vessel is equipped with double draglines, double underwater mud pumps and double in-cabin mud pumps, which are used for loading and pumping mud out of the cabin to the shore, maximizing the working efficiency of the mud pumps. At the same time, it is designed with single and double pump bow blowing, single bow spraying for shore discharge and reserved backfilling functions. It has a maximum dredging depth of 120 meters and a maximum discharge distance of 10 kilometers. It is currently the most powerful drag-suction dredger in Asia with comprehensive capabilities.

[0045] The present invention comprehensively considers the dredging conditions, geographical environment, load conditions, power supply, energy consumption, environmental protection requirements and other factors, as well as the design to meet the existing and future load requirements, so as to determine the scale, layout and configuration of the power system, make full use of the power reserve margin of the ship's main engine, achieve the purpose of energy saving, and adopt a shaft belt generator 3 for power supply. Its power type adopts a composite transmission form, which has the advantages of good operating economy, low maintenance cost and improved engine room environment. The number of diesel engines is reduced relative to the single-machine transmission type. The mud tank area and the engine room area are arranged at the bow and stern of the ship respectively, which can also increase the balance and dredging capacity of the ship, laying the foundation for optimizing the cabin layout; the mud pump, high-pressure flushing pump, side thrust motor, etc. are connected to the 6.6kV medium-voltage distribution board, which not only solves the problem of long-distance transmission of the high-power shaft belt generator 3, but also reduces the difficulty of manufacturing electrical components in the medium-voltage system and the difficulty of cable laying, thereby reducing the cost of ship construction. At the same time, considering the impact of harmonics on the ship, the frequency converter can use 12 pulses. For low-power equipment, phase-shifting transformers can be used to reduce the number of transformers.

[0046] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A multi-operating-state power system integrated control technology, characterized in that: The AC main power supply system on board the vessel is distributed equally on both sides of the vessel and the vessel is equipped with double rakes; Two 14400kW main diesel generator sets and a 1250kW stern thruster are arranged at the bottom of the engine room at the stern, each main diesel generator set is connected to two shaft-belt generators respectively, and a 1250kW stern thruster is connected between the main propulsion gearbox 2 and the adjustable propeller; Two 1500kW auxiliary generators and a control room are installed on the stern of the engine room platform 2. A 400V stern main switchboard is installed in the control room. A 6.6kV medium-voltage switchboard is installed on the left and right chords of the engine room platform 2. Two shaft generators include a left shaft generator and a right shaft generator, which are connected to a 6.6kV medium-voltage switchboard respectively. The stern is also equipped with a stern thruster motor, a left auxiliary generator, and a right auxiliary generator; The power equipment on the bow is centrally arranged in the bow inverter room and the bow transformer room. Based on the principle of proximity, the power equipment serving the cabin mud pump, high-pressure flushing pump, and bow thruster are arranged nearby for easy wiring and control. The bow is equipped with a 400V bow power distribution board, a bow PLC cabinet, a left cabin mud pump, a right cabin mud pump, a left underwater mud pump, a right underwater mud pump, a left cabin mud pump power switch cabinet, a right cabin mud pump power switch cabinet, a left high-pressure flushing pump, No. 1 bow thruster motor, a right high-pressure flushing pump, and No. 2 bow thruster motor. The left cabin mud pump motor of the left cabin mud pump and the left underwater mud pump motor of the left underwater mud pump are connected to the left cabin mud pump power switch cabinet, and the right cabin mud pump motor of the right cabin mud pump and the right underwater mud pump motor of the right underwater mud pump are connected to the right cabin mud pump power switch cabinet. A main transformer is connected between the 400V stern main switchboard and a 6.6kV medium voltage switchboard, and between the 400V bow switchboard and another 6.6kV medium voltage switchboard, and the 400V bow switchboard is connected to the 400V stern main switchboard; The stern thruster motor, No. 1 bow thruster motor, the left high-pressure flushing pump motor of the left high-pressure flushing pump, and the mud pump power switch cabinet in the left cabin are all connected to the left 6.6kV medium-voltage switchboard of the second platform of the engine room; The above structure has different power distribution control modes for different operating conditions: Double-sided mud pump dredging mode: Two shaft generators + two auxiliary generators are used for power supply: the two shaft generators supply power to two 6.6kV switchboard buses respectively, and the 6.6kV switchboard bus tie switch is open; the 400V stern main switchboard bus switch is closed, and the two auxiliary generators supply power, and the two main transformers do not work; When the dredging depth exceeds 45m but is less than 70m, the dredging operation is carried out by extending the rake pipe and using underwater pumps and double rakes; Single side dredging mode - port side: The left shaft generator is used for power supply: two shaft generators supply power to two 6.6kV switchboard buses respectively, and the 6.6kV switchboard bus tie switch is open; the 400V stern main switchboard bus switch is closed, and the two auxiliary generators supply power, and the two main transformers do not work; When the dredging depth exceeds 45m but is less than 70m, the dredging operation is carried out by extending the rake pipe and using underwater pumps and double rakes; Single side dredging mode - port side: The left shaft generator is used for power supply: the left shaft generator supplies power to the 6.6kV switchboard busbar, and the left 6.6kV switchboard busbar contact switch is closed; the two main transformers are working, and the 400V stern main switchboard busbar contact switch is open; the two auxiliary generators are not working; When the dredging depth is greater than 70m, the starboard rake pipe is extended and the underwater mud pump is connected in series with the mud pump in the left cabin for single rake dredging operation; Single-side dredging mode - starboard: The shaft generator is used for power supply: the right shaft generator supplies power to the right 6.6kV switchboard busbar, and the 6.6kV switchboard busbar contact switch is closed; the two main transformers are working, and the 400V stern main switchboard busbar contact switch is open; the two auxiliary generators are not working; Single-side mud blowing mode in power saving mode - port side: The left shaft generator + 2 auxiliary generators are used for power supply: the left shaft generator supplies power to the 6.6kV switchboard bus, and the 6.6kV switchboard bus contact switch is closed; the 400V stern main switchboard bus contact switch is closed, and the two auxiliary generators supply power, the two main transformers do not work, and the right shaft generator does not work; Any one mud pump in the cabin or two mud pumps in series can be used to pump the mud in the mud tank to the shore through the ship's tank pumping system and the bow blowing shore connector connected to the floating pipe. At this time, the ship is in the anchored or dynamically positioned DP state; Single-side mud blowing mode in power saving mode - starboard: The right shaft generator + 2 auxiliary generators are used for power supply: the right shaft generator supplies power to the 6.6kV switchboard bus, and the 6.6kV switchboard bus contact switch is closed; the 400V stern main switchboard bus contact switch is closed, and the two auxiliary generators supply power, the two main transformers do not work, and the left shaft generator does not work; Any one cabin mud pump or two cabin mud pumps in series can be used, and bow spraying operation can be realized through the bow nozzle and the ship's cabin pumping system. At this time, the ship is in anchored or dynamically positioned DP state; Full speed or parking mode: Use auxiliary generators for power supply: 1 or 2 auxiliary generators are used for power supply, and the 400V busbar tie switch of the stern main switchboard is closed; 2 shaft generators are not working, 2 main transformers are not working; During free navigation, the power demand of all 400V auxiliary equipment is met. When a power supply failure occurs in the 6.6kV distribution board of the main power supply, causing the 400V bus to lose power, the auxiliary generator will automatically start and supply power to the 400V stern main distribution board; in the shore discharge condition, the auxiliary generator operates according to the power grid demand and supplies power to the 400V stern main distribution board. The auxiliary generator can be used as a generator for mooring in the port.

2. The multi-operating-state power system integrated control technology according to claim 1 is characterized in that: The stern thruster frequency converter and the stern thruster transformer are connected between the left 6.6kV medium-voltage distribution board and the stern thruster motor; the No. 1 bow thruster frequency converter and the No. 1 bow thruster transformer are connected between the left 6.6kV medium-voltage distribution board and the No. 1 bow thruster motor; the left high-pressure flushing water pump frequency converter and the left high-pressure flushing water pump transformer are connected between the left 6.6kV medium-voltage distribution board and the left high-pressure flushing water pump motor; the left mud pump transformer and the left mud pump frequency converter are connected between the left 6.6kV medium-voltage distribution board and the mud pump power switching cabinet in the left cabin.

3. The multi-operating-state power system integrated control technology according to claim 1 is characterized in that: The main diesel generator set is also connected to a main propulsion gearbox.

4. The multi-operating-state power system integrated control technology according to claim 1 is characterized in that: The stern is also equipped with a left pre-charging power cabinet, a fuel supply unit and a right pre-charging power cabinet; The left pre-charging power supply cabinet is connected to the left 6.6kV medium-voltage distribution board, and the left pre-charging magnetizing transformer is connected between the left 6.6kV medium-voltage distribution board and the left pre-charging power supply cabinet. The right pre-charging power supply cabinet is connected to the right 6.6kV medium-voltage distribution board, and the right pre-charging magnetizing transformer is connected between the right 6.6kV medium-voltage distribution board and the right pre-charging power supply cabinet.

5. The multi-operating-state power system integrated control technology according to claim 1 is characterized in that: There is also a power distribution control mode: Emergency mode: Connect the emergency generator and the emergency switchboard to the 400V stern main switchboard, the emergency generator supplies power to the emergency switchboard, and the bus tie switch from the emergency switchboard to the 400V stern main switchboard is open. This meets the power requirements of the entire ship's emergency power and an emergency hydraulic pump under navigation and dredging conditions as specified by the classification society and relevant authorities. In addition, when the normal 400V power supply fails, the emergency generator automatically starts to supply power to the emergency switchboard. When the normal 400V power supply is restored after the power failure, the generator can be connected in parallel with the auxiliary generator for a short time through the tie switch to transfer the load.

6. The multi-operating-state power system integrated control technology according to claim 1 is characterized in that: Taking into account the problem that the total harmonic distortion (THD) on board does not exceed 4% and the single harmonic distortion does not exceed 3%, the left high-pressure flushing pump inverter and the left mud pump inverter can adopt a 24-pulse frequency conversion system, and other inverters use 12 pulses.

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