Experiment platform for marine integrated power system based on multiple energies and hybrid energy storage technology

[0041] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0042] refer to Figure 1 to Figure 4 As shown in the figure, the experimental platform of ship integrated power system based on multi-energy and hybrid energy storage technology in one embodiment of the present invention includes new energy distributed generation and hybrid energy storage system module 3, supercritical carbon dioxide Brayton cycle waste heat power generation Module 1, ship traditional generator set module 4, simulated ship power grid and electric propulsion device module 5, medium voltage isolation transformer 9, ship medium voltage power grid 10 and intelligent integrated management system 5-8, ship medium voltage power grid 10 passes through the The voltage isolation transformer 9 is connected with the ship's main switchboard 7, the new energy distributed generation and hybrid energy storage system module 3, the supercritical carbon dioxide Brayton cycle waste heat power generation module 1, the ship's traditional generator set module 4 and the simulated ship power grid and electric propulsion The device modules 5 are all connected to the main switchboard 7 of the ship, and the supercritical carbon dioxide Brayton cycle waste heat power generation module 1 and the main switchboard 7 of the ship are connected with a marine off-grid hybrid bidirectional variable frequency converter suitable for kHz-level alternating current. The inverter module 2, the marine off-grid hybrid bidirectional variable frequency converter module 2 suitable for kHz-level alternating current, and the simulated ship power grid and electric propulsion device module 5 are respectively connected to the intelligent integrated management system 5-8.

[0043] Further, the intelligent integrated management system 5-8 is the control core of an experimental platform based on the multi-energy power generation and hybrid energy storage technology of the ship's integrated power system; the supercritical carbon dioxide Brayton cycle waste heat power generation module 1 is the use of the ship's main engine exhaust gas The low-temperature waste heat is generated by the new power cycle waste heat power generation technology, that is, the supercritical carbon dioxide Brayton cycle waste heat power generation system, which realizes the deep utilization of the low-temperature waste heat of the exhaust gas of the ship's main engine; it is suitable for marine off-grid hybrid bidirectional frequency conversion of kHz-level AC power The converter module 2 is used to solve the problem of frequency conversion and current conversion of high-frequency three-phase high-frequency alternating current. The frequency, phase and voltage amplitude of the three-phase alternating current meet the relevant technical standards for grid connection with the ship's power grid, and finally realize the grid-connected operation with the ship's power grid.

[0044] The supercritical carbon dioxide Brayton cycle waste heat power generation module 1 includes a heat exchanger 1-1, a power turbine 1-2, a permanent magnet synchronous generator set 1-3, a high temperature regenerator 1-4, a low temperature regenerator 1-5, a main Compressor 1-6, recompressor 1-7 and compressor 1-8, the inlet end and outlet end of heat exchanger 1-1 are respectively connected with the high pressure side outlet of high temperature regenerator 1-4 and power turbine 1-2 The inlet end of the power turbine 1-2 is connected to the low pressure side inlet of the high temperature regenerator 1-4, and the low pressure side outlet of the high temperature regenerator 1-4 is connected to the low pressure side inlet of the low temperature regenerator 1-5. Connection, the high pressure side inlet of high temperature regenerator 1-4 is connected with the high pressure side outlet of low temperature regenerator 1-5 and the outlet of recompressor 1-7, the outlet of main compressor 1-6 is connected with low temperature regenerator 1 The inlet of the high pressure side of -5 is connected, the inlet of the main compressor 1-6 and the inlet of the sub-compressor 1-7 are connected with the outlet of the low pressure side of the low temperature regenerator 1-5, and the power shaft of the power turbine 1-2 is connected to the permanent magnet The synchronous generator sets 1-3 are connected, the power shafts of the main compressor 1-6 and the re-compressor 1-7 are connected with the compressor 1-8, and the compressor 1-8 is connected to the main switchboard 7 of the ship through the marine three-phase cable 6 Connection; realize the function of low-temperature waste heat of ship's main engine exhaust exhaust gas for power generation.

[0045] Further, the permanent magnet synchronous generator sets 1-3 are connected with a marine off-grid hybrid bidirectional variable frequency converter module 2 suitable for kHz-level alternating current.

[0046] Further, the marine off-grid hybrid bidirectional variable frequency converter module 2 suitable for kHz-level alternating current includes a 24-pulse rectifier 2-1, a first DC-AC inverter 2-4 and a first LCL filter connected in sequence. 2-5, the 24-pulse rectifier 2-1, the first DC-AC inverter 2-4 and the first LCL filter 2-5 are respectively connected with the intelligent integrated management system 5-8, and the 24-pulse rectifier 2-1 is connected with the intelligent integrated management system 5-8. The supercritical carbon dioxide Brayton cycle waste heat power generation module 1 is connected, and the first LCL filters 2-5 are connected to the main switchboard 7 of the ship.

[0047] Further, the 24-pulse rectifier 2-1 includes a 24-pulse phase-shifting transformer 2-2 and a first AC-DC rectifier 2-3, and one end of the 24-pulse phase-shifting transformer 2-2 is connected to the first AC-DC rectifier 2-3. One end is connected, the other end of the 24-pulse phase-shifting transformer 2-2 is connected with the supercritical carbon dioxide Brayton cycle waste heat power generation module 1, and the other end of the first AC-DC rectifier 2-3 is connected with the first DC-AC inverter 2- 4 is connected, the first LCL filter 2-5 is connected to the main switchboard 7 of the ship.

[0048] Further, the new energy distributed power generation and hybrid energy storage system includes a photovoltaic power generation system 3-1, a wind power generation system 3-2, a fuel cell power generation system 3-3, a hybrid energy storage system 3-4 and a microgrid central controller 3 -7, the photovoltaic power generation system 3-1, the wind power generation system 3-2, the fuel cell power generation system 3-3 and the hybrid energy storage system 3-4 are respectively connected to the main switchboard 7 of the ship and the microgrid center controller 3-7 .

[0049]Further, the new energy distributed power generation and hybrid energy storage system also includes DC busbars, public connection points 3-10 and power frequency isolation transformers, photovoltaic power generation system 3-1, wind power generation system 3-2, fuel cell power generation system 3 -3 and the hybrid energy storage system 3-4 are connected to the main switchboard 7 of the ship through the DC busbar, the photovoltaic power generation system 3-1 is connected to the DC busbar through the second DC-DC converter 3-1-3, and the wind power The power generation system 3-2 is connected to the DC bus through the second AC-DC rectifier 3-2-5 and the DC-DC converter in sequence, and the fuel cell power generation system 3-3 is connected to the DC bus through the DC-DC converter, and the DC The bus bar is also connected with DC loads 3-9, and the DC bus bar is sequentially connected to the main switchboard 7 of the ship through the DC-AC inverter, the common connection point 3-10 and the power frequency isolation transformer.

[0050] Further, the new energy distributed generation and hybrid energy storage system also includes an inverter grid-connected controller based on a PQ or V/f control strategy, which consists of a DC-DC converter, a DC-AC inverter, an LCL It consists of filter, power frequency isolation transformer and main switch of grid-connected controller. The photovoltaic power generation system 3-1 and the fuel cell power generation system 3-3 are always at their respective maximum power points through the controller to output DC current; the wind power generation system 3-2 is rectified through the AC-DC rectifier, The generated three-phase alternating current is rectified and a direct current is output. The DC currents output by the photovoltaic power generation system 3-1, the fuel cell power generation system 3-3 and the wind power generation system 3-2 are all merged into the DC busbar; After being filtered by the LCL filter, a stable three-phase alternating current is output, and the three-phase alternating current is boosted by the power frequency isolation transformer and then collected into the main switchboard 7 of the ship.

[0051] Further, the hybrid energy storage system 3-4 includes a battery pack 3-5 and a supercapacitor pack 3-6, the supercapacitor pack 3-6 is connected to a multi-port DC-DC converter 3-6-1, and the battery pack 3-5 The first DC-DC converter 3-5-1 is connected to the multi-port DC-DC converter 3-6-1 and the microgrid central controller 3-7 respectively, and the multi-port DC-DC converter 3-6-1 Connect to the DC busbar and the microgrid center controller 3-7 respectively.

[0052] Further, the hybrid energy storage system 3-4 is composed of a battery pack 3-5, a supercapacitor pack 3-6 and a corresponding control system. Hybrid energy storage system 3-4 can overcome the disadvantages of single energy storage (such as battery pack 3-5) occupying a large space and high cost of investment, operation and maintenance, and at the same time, it can prolong the service life of energy storage devices. New energy such as solar and wind power generation system output power, thereby improving the power quality, grid reliability and system security of the multi-energy ship integrated power system. The hybrid energy storage system 3-4 can effectively reduce the adverse effects of high-penetration new energy on the power quality of the ship's power system and the reliability of the power grid.

[0053] Further, the ship transmission generator set module includes a diesel generator set 4-1 and an LNG gas turbine generator set 4-2, and the diesel generator set 4-1 and the LNG gas turbine generator set 4-2 are respectively connected to the main switchboard 7 of the ship.

[0054] Further, the simulated ship power grid and electric propulsion device module 5 includes an energy-feeding generator set, a port electric propulsion device and a starboard electric propulsion device. Connection, the energy-feeding generator set, the port side electric propulsion device and the starboard side electric propulsion device are respectively connected with the intelligent integrated management system 5-8.

[0055] Further, the energy-feeding generator set includes a port side gear box 5-4, an energy-feeding generator 5-3, and a port side power frequency isolation transformer 5-2. The power-feeding generator 5-3 is connected to the port side power frequency isolation transformer 5-2 through Ship main switchboard 7 connection;

[0056] The port side electric propulsion device includes the port side switchboard 5-1, the port side propulsion motor power conversion controller 5-6 and the port side propulsion motor 5-7. The port side propulsion motor 5-7 communicates with the port side propulsion motor power conversion controller 5-6 through the port side propulsion motor power conversion controller 5-6. The switchboard 5-1 is connected, the port side switchboard 5-1 is connected with the ship's main switchboard 7, and the port side propulsion motor 5-7 is connected with the feed energy generator 5-3 through the port side variable speed gearbox 5-4;

[0057] The starboard electric propulsion device includes the starboard power distribution board 5-9, the starboard propulsion motor power conversion controller 5-11 and the starboard propulsion motor 5-12. The starboard propulsion motor 5-12 is connected to the starboard side through the starboard propulsion motor power conversion controller 5-11. The switchboard 5-9 is connected, the starboard propulsion motor 5-12 is connected with the starboard propeller 5-13, and the starboard switchboard 5-9 is connected with the main switchboard 7 of the ship;

[0058] The energy-feeding generator 5-3, the port side propulsion motor 5-7 and the starboard side propulsion motor 5-12 are respectively connected with the intelligent integrated management system 5-8.

[0059] Further, the port switchboard 5-1 is also connected with other power loads 5-5 on the port side, and the starboard switchboard 5-9 is also connected with other power loads 5-10 on the starboard side, other power loads on the port side 5-5 and other power on the starboard side. The loads 5-10 are respectively connected with the intelligent integrated management system 5-8.

[0060] Further, the energy-feeding generator set is composed of a port side gear box 5-4, an energy-feeding generator 5-3, a variable frequency governor, a port side power frequency isolation transformer 5-2 and a grid-connected controller for the energy-feeding generator set, and outputs Three-phase alternating current, the three-phase alternating current is fed into the main switchboard 7 of the ship through the port side power frequency isolation transformer 5-2.

[0061] Further, the port side propulsion motor 5-7 and the starboard side propulsion motor 5-12 are both high-power propulsion motors, and the starboard side propulsion motor 5-12 is connected with a starboard propeller 5-13, and the starboard side propeller 5-13 is a fixed-pitch propeller, high-power propulsion. The motor is powered by the main switchboard, which is connected to the fixed-pitch propeller; the high-power propulsion motor is connected with a high-power propulsion motor speed and torque controller 11, which is connected to an intelligent integrated management system 5- 8 is connected, the port side propulsion motor 5-7 is connected to the asynchronous generator 3-2-3 through the port side gear box 5-4, so as to realize the recovery and utilization of part of the electric energy in the experimental platform.

[0062] Further, the intelligent integrated management system 5-8 includes a communication management unit, a data storage unit 5-8-5 and an integrated energy management unit 5-8-2. Intelligent integrated management system 5-8 Real-time with photovoltaic power generation system 3-1, wind power generation system 3-2, fuel cell power generation system and hybrid energy storage system inverter grid-connected controller, LNG gas turbine generator set grid-connected main switch 4-2-3. The speed and torque controller of the marine electric propulsion motor and the energy-feeding generator set controller 5-3-3 carry out two-way communication of control signals and monitoring data. At the same time, real-time energy management is performed on the power distribution, energy distribution and operation process within the hybrid energy storage system 3-4.

[0063] The working principle of the present invention:

[0064] The technical problem to be solved by the present invention is to transform on-demand based on the original ship power system only from the perspective of engineering technology in the prior art, instead of integrating multi-energy sources into the ship power system from the perspective of overall design and system-wide operation management . The present invention provides an experimental platform for ship integrated power system based on multi-energy power source and hybrid energy storage technology, which can integrate multi-energy sources into the ship's power system from the perspective of overall design and whole-system operation management. First, introduce various energy forms into the ship's energy system, mainly including new energy distributed power generation units (photovoltaic power generation system 3-1, wind power generation system 3-2 and fuel cell power generation system 3-3) and smoke exhaust based on the ship's main engine A new type of power cycle waste heat power generation system (supercritical carbon dioxide Brayton cycle waste heat power generation) based on exhaust heat. Secondly, in order to overcome the shortcomings of a single energy storage device, the hybrid energy storage technology is used to solve the shortcomings of a single energy storage device such as short service life, high cost and large volume; adverse effects on power quality and grid reliability. Thirdly, in order to solve the problem of high-frequency (1000-1200Hz) three-phase alternating current generated by supercritical carbon dioxide Brayton cycle waste heat power generation system and the grid-connected operation of the ship's power grid, a marine off-grid hybrid type suitable for kHz-level alternating current was designed. The bidirectional frequency conversion converter realizes the electric energy conversion of high-frequency three-phase current, so that its frequency, phase and voltage amplitude all meet the relevant technical standards for grid-connected operation with the ship's power grid. Finally, by simulating the ship's power grid and electric propulsion device, experiments and simulations are carried out on the power generation, transformation, distribution and consumption of the entire system, related operation and control strategies.

[0065] Provide an experimental platform based on multi-energy power generation and hybrid energy storage technology of ship integrated power system, including supercritical carbon dioxide Brayton cycle waste heat power generation module 1, marine off-grid hybrid bidirectional variable frequency converter module suitable for kHz-level alternating current 2. New energy distributed generation and hybrid energy storage system module 3. Traditional generator set module and simulated ship power grid and electric propulsion device module 5. The experimental platform also includes an intelligent integrated management system 5-8, which optimizes the configuration and safety control of the power generation, transformation, distribution, power consumption and energy storage processes of the multi-energy power generation system of the entire system experimental platform.

[0066] In the experimental platform described in the present invention, the new power cycle waste heat power generation technology of ship main engine waste heat adopts a waste heat power generation system based on supercritical carbon dioxide Brayton cycle, and its core components mainly include heat exchanger 1-1, power turbine 1-2, High-speed permanent magnet synchronous generator sets 1-3, high-temperature regenerators, low-temperature regenerators 1-5 and compressors 1-8, etc., realize the function of low-temperature waste heat from the exhaust gas of the ship's main engine for power generation.

[0067] In the experimental platform of the present invention, the marine off-grid hybrid bidirectional variable frequency converter module 2 suitable for kHz-level alternating current mainly includes a 24-pulse rectifier 2-1 (consisting of a 24-pulse phase-shifting transformer 2-2, AC-DC rectifier), bidirectional DC-AC inverter (440Vac/60Hz or 400Vac/50Hz), LCL filter, inverter grid-connected controller and medium voltage isolation transformer 9 (6600Vac/60Hz), as well as the main circuit of the device and Control circuit.

[0068] In the experimental platform of the present invention, the multi-energy ship integrated power system grid-connected controllers all include the photovoltaic power generation system 3-1, the wind power generation system 3-2, and the fuel cell connected to the intelligent integrated management system 5-8. Power generation system 3-3, LNG gas turbine power generation system, energy-feeding generator set and ship electric propulsion device. All power generation units including photovoltaic power generation system 3-1, fuel cell power generation system 3-3, wind power generation system 3-2, LNG gas turbine generator set 4-2, energy-feeding generator set and grid-connected controller are connected to the grid through three-phase cables. The main switchboard of the ship is connected with 7 phases, and the output three-phase voltage is 400Vac/50Hz or 440Vac/60Hz.

[0069] In the experimental platform of the present invention, the hybrid energy storage system 3-4 is composed of a battery pack 3-5, a super capacitor and a corresponding control system. The battery pack 3-5 is connected to the DC bus through the multi-port DC-DC converter 3-6-1, and the supercapacitor pack 3-6 is connected to the DC bus through the DC-DC converter.

[0070] In the experimental platform of the present invention, the output currents of the photovoltaic power generation system 3-1, the wind power generation system 3-2, the fuel cell power generation system and the hybrid energy storage system are all merged into the DC busbar and passed through the DC-DC converter. Voltage regulation, and then the DC-AC inverter converts the DC current output by the DC-DC converter into three-phase alternating current. After the three-phase alternating current is filtered and boosted by the LCL filter and the power frequency isolation transformer, the The grid-connected controller realizes grid-connection with the main switchboard 7 of the ship.

[0071] In the experimental platform of the present invention, the energy-feeding generator set includes a port side gear box 5-4, an energy-feeding generator 5-3, a variable frequency governor, a port side power frequency isolation transformer and a grid-connected controller for the energy-feeding generator set. A rigid shaft connection is used between the port side speed change gearbox 5-4 and the energy-feeding generator 5-3. The grid-connected controller of the energy-feeding generator 5-3 controls the frequency converter to adjust the three-phase AC power output by the energy-feeding generator set, and the three-phase AC power is then fed into the main switchboard 7 of the ship through the port side power frequency isolation transformer 5-2.

[0072] In the experimental platform of the present invention, the simulated marine electric propulsion device includes a high-power propulsion motor, a fixed-pitch propeller, and a high-power propulsion motor speed and torque controller 11; the high-power propulsion motor is powered by the main switchboard, and its Connected with the fixed-pitch propeller shaft, the high-power propulsion motor speed and torque controller 11 is connected with the intelligent integrated management system 5-8.

[0073] In the experimental platform of the present invention, the simulated ship electric propulsion device includes a port side electric propulsion device and a starboard side propulsion device. Among them, the port side electric propulsion device includes the port side propulsion motor 5-7 and the propulsion motor power conversion controller; the starboard side electric propulsion device includes the starboard side propulsion motor 5-12, the propulsion motor power conversion controller and the propeller 5-13. The port and starboard distribution boards respectively correspond to the port and starboard propulsion motor power conversion controllers 5-11 for power distribution; the high-power propulsion motor speed and torque controller 11 adjusts the port and starboard propulsion motor power conversion controllers 5-11 as required Output voltage and frequency to control the operating state of port and starboard propulsion motors. In addition, the port side propulsion motor 5-7 is connected to the asynchronous generator 3-2-3 through the port side speed change gearbox 5-4, so as to realize the recovery and reuse of part of the electric energy in the experimental platform.

[0074] In the experimental platform of the present invention, the intelligent integrated management system 5-8 includes an integrated communication management unit 5-8-1, a data storage unit 5-8-5 and an integrated energy management unit 5-8-2. The grid-connected controller and each controller of the entire experimental platform are connected with the intelligent integrated management system 5-8 to realize real-time two-way communication of control signals and monitoring data for the entire experimental platform. The intelligent integrated management system 5-8 processes the received signals and sends them to the integrated energy management unit 5-8-2 and the data storage unit 5-8-5 respectively, and implements dynamic operation management of the entire experimental platform. figure 1 Middle: a schematic diagram of the principle of the experimental platform of the ship's integrated power system based on the multi-energy and hybrid energy storage technology in the embodiment of the present invention. It mainly includes five modules: 1. Supercritical carbon dioxide Brayton cycle waste heat power generation module 1; 2. Marine off-grid hybrid bidirectional variable frequency converter module 2 suitable for kHz-level AC power; 3. New energy distributed generation and hybrid storage Energy system module 3; 4, ship traditional generator set module 4; 5, simulated ship power grid and electric propulsion device module 5. The experimental platform also includes an intelligent integrated management system 5-8, which optimizes the configuration and safety control of the entire experimental platform's power generation, distribution, substation and electricity consumption, as well as the operation process.

[0075] In the embodiment of the present invention, the core components of the supercritical carbon dioxide Brayton cycle waste heat power generation module 1 include a heat exchanger 1-1, a power turbine 1-2, a high-speed permanent magnet synchronous generator set 1-3, and a high-temperature regenerator 1-4 , Low temperature regenerator 1-5, main compressor 1-6, re-compressor 1-7 and compressor 1-8, etc., to realize the function of using the low-temperature waste heat of the ship's main engine exhaust gas for power generation.

[0076] In the embodiment of the present invention, the marine off-grid hybrid bidirectional variable frequency converter module 2 suitable for kHz-level alternating current mainly consists of a 24-pulse rectifier 2-1, a DC-AC inverter 2-4 and an LCL filter 2- 5 compositions. The 24-pulse rectifier 2-1 consists of a 24-pulse phase-shifting transformer 2-2 and an AC-DC rectifier 2-3. Realize the high-frequency (1000-1200Hz) three-phase alternating current frequency conversion and current conversion generated by the supercritical carbon dioxide Brayton cycle waste heat power generation system, so that the frequency, phase and voltage amplitude all meet the technical standards related to the grid-connected operation of the ship's power grid.

[0077] In the embodiment of the present invention, the new energy distributed power generation and hybrid energy storage system module 3 is mainly composed of a photovoltaic power generation system 3-1, a wind power generation system 3-2, a fuel cell power generation system 3-3, and a battery pack 3-5 and The hybrid energy storage system 3-4 formed by the supercapacitor bank 3-6 also includes the microgrid central controller 3-7, which introduces the new energy distributed generation system into the ship power system.

[0078] In the embodiment of the present invention, the ship's traditional generator set module 4 is mainly a diesel generator set 4-1 and an LNG gas turbine generator set 4-2, which serve as the main power source of the ship's power system and supply power to the entire ship's power grid.

[0079] In the embodiment of the present invention, the simulated ship power grid and the electric propulsion device module 5 mainly include an energy-feeding generator set 5-3, a port side propulsion motor 5-7, a starboard side propulsion motor 5-12, a port side propulsion motor power conversion controller 5-6 and The starboard propulsion motor power conversion controller 5-11 and other core components are composed of relevant experimental research on the power generation, distribution, transformation and electricity consumption of the entire system.

[0080] figure 2 Middle: a schematic diagram of the connection structure of the experimental platform of the ship integrated power system based on the multi-energy and hybrid energy storage technology in the embodiment of the present invention. In the embodiment of the present invention, the photovoltaic power generation system 3-1, the fuel cell power generation system 3-3, the hybrid energy storage system 3-4, and the wind power generation system 3-2 are connected to the DC busbar by three-phase cables through the DC-DC converter. In order to output a stable DC current, the stable DC current of the DC busbar is inverted by the DC-AC inverter 3-11-1, and outputs three-phase AC power, which is filtered by the LCL filter 3-11-2 to reduce the harmonics to the ship's power grid. Wave pollution is boosted by the power frequency isolation transformer 3-11 (400Vac/50Hz or 440Vac/60Hz) and connected to the main switchboard 7 of the ship through the grid-connected main switch 3-11-3. Diesel generator set 4-1, LNG gas turbine generator set 4-2 and energy-feeding generator set 5-3 are all connected to the main switchboard 7 of the ship through three-phase cables, and the output three-phase voltage is 400Vac/50Hz or 440Vac/60Hz.

[0081] In the embodiment of the present invention, the photovoltaic power generation unit includes a solar photovoltaic array 3-1-1, a lightning protection bus bar 3-1-2 and a DC-DC converter 3-1-3. The fuel cell power generation unit 3-3 includes a fuel cell assembly 3-3-1, a bus bar 3-3-2, and a DC-DC converter 3-3-3. The hybrid energy storage system 3-4 mainly includes a battery pack 3-5, a DC-DC converter 3-5-1, an energy management system 3-4-1, a supercapacitor bank 3-6 and a multi-port DC-DC converter 3 -6-1. The wind power generation unit 3-2 mainly includes a vertical axis/horizontal axis wind turbine 3-2-1, a differential gearbox 3-2-2, an asynchronous generator 3-2-3, a variable frequency speed governor 3-2-4, It is composed of AC-DC rectifier 3-2-5 and wind turbine control system 3-13. Among them, the photovoltaic power generation unit, the fuel cell power generation unit and the hybrid energy storage system all stabilize the output DC current through the DC-DC converter and then input it to the DC busbar. The photovoltaic power generation unit adopts MPPT (Maximum Power Point Tracking) control based on the PQ or V/f control strategy, so that the output power of the photovoltaic power generation unit is kept at the maximum point. The AC current output by the wind power generation unit is rectified by the AC-DC rectifier 3-2-5 to output a stable DC current and merge into the DC bus bar together with other power generation units. The stable DC current on the DC busbar is inverted by the DC-AC inverter 3-11-1, which inverts the stable DC current into a three-phase AC current, and is filtered by the LCL filter 3-11-2 to reduce the The harmonic pollution of the ship power grid is boosted by the power frequency isolation transformer 3-11 (400Vac/50Hz or 440Vac/60Hz) and connected to the ship's main switchboard 7 through the main switch 3-11-3 of the grid connection device. The electric energy output by the new energy generation unit and the hybrid energy storage system is connected to the grid by the inverter grid-connected controller 3-12 based on the PQ or V/f control strategy and the main switchboard 7 of the ship.

[0082] In the embodiment of the present invention, the LNG gas turbine generator set 4-2 mainly includes the LNG gas turbine 4-2, the gas turbine transmission gearbox 4-2-1, the LNG gas turbine synchronous generator 4-2-2, and the main grid connection device of the LNG gas turbine generator set. Switch 4-2-3 and LNG gas turbine generator set control system 3-15. The LNG gas turbine generator set 4-2 is connected to the ship's main switchboard 7 through a three-phase cable through the grid-connected main switch 4-2-3.

[0083] In the embodiment of the present invention, the energy-feeding generator set includes a port side gear box 5-4, an energy-feeding generator 5-3, a variable frequency governor 5-3-2, a port side power frequency isolation transformer 5-2, and an energy-feeding generator set Grid connected controller 5-3-3. The grid-connected controller 5-3-3 of the energy-feeding generator controls the frequency converter 5-3-2 to adjust the three-phase alternating current output by the energy-feeding generator 5-3, and the three-phase alternating current passes through the port side power frequency isolation transformer 5 The -2 boost is fed into the ship's main switchboard 7.

[0084] In the embodiment of the present invention, the electric propulsion device includes a port propulsion motor 5-7, a port propulsion motor power conversion controller 5-6, a starboard propulsion motor 5-12, a starboard propulsion motor power conversion controller 5-11, and a starboard propeller 5- 13 and a high-power propulsion motor speed and torque controller 11, the high-power propulsion motor speed and torque controller 11 is connected to the intelligent integrated management system 5-8. The port side switchboard and the starboard side switchboard 5-9 distribute power to the corresponding left and right propulsion motor power conversion controllers, and the high-power propulsion motor speed and torque controller 11 regulates the output of the left and right motor power conversion controllers as required Voltage and frequency to control the operating state of the port and starboard propulsion motors. The port side propulsion motor 5-7 is not installed with the propulsion propeller 5-13, which is connected to the energy-feeding generator 5-3 through the port side gear box 5-4, so as to realize the recycling of part of the electric energy in the experimental platform.

[0085] image 3 A schematic diagram of a marine off-grid hybrid bidirectional variable frequency converter module for kHz-level alternating current in the embodiment of the present invention. The main package includes 24-pulse phase-shifting voltage rectification module 2-1; DC-AC inverter module 2-4; LCL filter module 2-5; ship main switchboard 7; medium voltage isolation transformer module 9; inverter grid-connected control Module 13; Compressor operation and control module 14. In the embodiment of the present invention, the 24-pulse phase-shifting voltage transformation and rectification module 2-1 realizes the phase-shifting of the input and output voltages of the high-frequency three-phase AC power output by the supercritical carbon dioxide Brayton cycle waste heat power generation system to eliminate the harmonics of a specific order of the current. wave, reduce the harmonic pollution to the ship's power grid, and rectify the high-frequency three-phase alternating current to output stable direct current. The DC-AC inverter modules 2-4 combine with the inverter grid-connected control module 13 to invert the input stable DC current into three-phase AC power (400Vac/50Hz or 450Vac/60Hz), and the inverted three-phase AC current is filtered by the LCL Modules 2-5 filter, so that the frequency, phase and voltage amplitude of the high-frequency current generated by the supercritical carbon dioxide Brayton cycle waste heat power generation system meet and meet the relevant technical standards for grid connection with the ship's power grid, and the grid connection controller 13 passes through three. The phase cables are connected to the ship's main switchboard 7 to realize grid connection with the ship's power grid. The medium-voltage isolation transformer module 9 raises the voltage to 6600Vac/60Hz to supply the ship's medium-voltage power grid 10 . The compressors 1-8 only work when the supercritical carbon dioxide Brayton cycle waste heat power generation system is just started. When the input value of the waste heat in the supercritical carbon dioxide Brayton cycle waste heat power generation system reaches the optimal operating point, the compressors 1-8 8 stops working, and the compressors 1-8 are powered by the ship's low-voltage power grid. From the perspective of power grid operation safety, electrical interlocks are used to safely control the operation of compressors 1-8.

[0086] Figure 4A schematic diagram of the circuit structure of the marine off-grid hybrid bidirectional variable frequency converter module used for kHz-level alternating current in the embodiment of the present invention. In the embodiment of the present invention, the 24-pulse rectifier 2-1 mainly includes a 24-pulse phase-shifting transformer 2-2 and an AC-DC rectifier 2-3. Among them, the 24-pulse phase-shifting transformer 2-2 is composed of four groups of three-phase transformers whose primary and secondary windings have different connection modes. The connection method of the first group of transformer windings is D, y0 type, the primary side is delta connection, the secondary side is star connection, and the output voltage of the secondary side and the input voltage of the primary side have the same phase; the connection method of the second group of transformer windings It is D, d1 type, the primary side is delta connection, the secondary side is also delta connection, and the phase of the output voltage of the secondary side is 30° ahead of the output voltage phase of the primary side; the connection mode of the third group of transformer windings is D, y11 type, The primary side is a delta connection, the secondary side is a star connection, and the phase of the secondary side output voltage is 30° behind the phase of the primary side input voltage; the connection mode of the fourth group of transformer windings is D, d10 type, and the primary side is a delta connection , the secondary side is also connected in delta, and the phase of the secondary side output voltage lags 60° from the phase of the primary side input voltage. The 24-pulse phase-shifting transformer 2-2 can eliminate current harmonics to reduce harmonic pollution to the ship's power grid. The AC-DC rectifier 2-3 is composed of four sets of three-phase full-bridge uncontrolled rectifier circuits, which rectify the high-frequency three-phase alternating current (1000-1200Hz) generated by the supercritical carbon dioxide Brayton cycle waste heat power generation system and output stable direct current. .

[0087] In the embodiment of the present invention, the bidirectional DC-AC inverter 2-4 is controlled by the inverter grid-connected controller 13 to invert the stable DC current output by the 24-pulse rectifier 2-1 into three-phase AC power (400Vac/60Hz or 440Vac /50Hz), filtered by LCL filters 2-5, connected to the ship's main switchboard 7 through a three-phase cable, and finally boosted by a medium-voltage isolation transformer 9 (6600Vac/60Hz) to supply the ship's medium-voltage power grid 10.

[0088] In the embodiment of the present invention, the ship power grid needs to supply power to the compressor of the supercritical carbon dioxide Brayton cycle waste heat power generation system, and it is also necessary to realize the high frequency three-phase alternating current generated by the supercritical carbon dioxide Brayton cycle waste heat power generation system through frequency conversion, After the conversion and inversion process, the grid is connected to the ship's main switchboard 7 via the grid-connected inverter 13 , and is finally boosted (6600Vac/60Hz) through the medium-voltage isolation transformer 9 to supply the ship's medium-voltage grid 10 .

[0089] In the embodiment of the present invention, the compressor operation control module 14 uses an electrical interlock control circuit for control. First press the power switch QS, and press the switch SB in the first control branch 14-1 2 , contactor coil KM 1 Energized, contactor KM 1 The normally open contact is closed to form self-locking, the first control branch is connected, and the contactor KM 1 The main contact is closed, the main circuit is connected, and the compressors 1-8 start to work. At this time, the contactor KM in the second control branch 14-2 1 The normally closed contact is disconnected, that is, the second control branch 2 is disconnected. When the waste heat input in the supercritical carbon dioxide Brayton cycle waste heat power generation system reaches the optimal operating point of the system, press the switch SB at this time. 3 , the contactor KM in the second control branch 2 The coil is energized, the contactor KM 2 The normally open contact is closed to form self-locking, the second control branch is connected, and the contactor KM 2 The normally closed contact is disconnected, the first control branch is disconnected, and the contactor KM 1 The main contact is disconnected and connected with the contactor KM 1 The first control branch is interlocked, and the compressors 1-8 stop working. Contactor KM in main circuit of ship power grid 2 The main contact is closed and the main circuit is connected, that is, the supercritical carbon dioxide Brayton cycle waste heat power generation system is connected to the main power grid of the ship. connected to the grid. When the waste heat input of the supercritical carbon dioxide Brayton cycle waste heat power generation system is insufficient, press the switch SB in the first control branch 2 , start the compressor 1-8, at this time, the kHz marine AC medium voltage grid-connected bidirectional variable frequency converter is disconnected from the main power grid of the ship. When the waste heat input of the supercritical carbon dioxide Brayton cycle waste heat power generation system reaches the optimal operating condition After clicking, repeat the above steps.

[0090] To sum up, this experimental platform also includes an intelligent integrated management system 5-8, which optimizes the configuration, system analysis and monitoring, safety control and simulation of the entire experimental platform’s power generation, substation, distribution and electricity operation processes. . Among them, the ship's multi-energy power generation system includes photovoltaic power generation system 3-1, wind power generation system 3-2, fuel cell power generation system 3-3, LNG gas turbine generator set 4-2, diesel generator set 4-1, energy-feeding generator set and super Critical carbon dioxide Brayton cycle waste heat power generation system. The invention takes the multi-energy power generation system, the hybrid energy storage system and the intelligent integrated management system 5-8 as the center, integrates the application technology of various energy forms in the ship energy system, and realizes a multi-energy ship comprehensive power research method. It is an experimental platform for key issues such as system energy storage, high-frequency three-phase AC current frequency conversion, and grid-connected operation with ship power grids.

[0091] The above are only the preferred embodiments of the present invention, of course, the scope of the rights of the present invention cannot be limited by this, so the equivalent changes made according to the scope of the patent application of the present invention still belong to the protection scope of the present invention.