A hybrid ship DC networked electric propulsion system based on permanent magnet synchronous generator

Abstract

The present invention provides a hybrid ship DC network electric propulsion system based on permanent magnet synchronous power generation, wherein the output of the engine is connected to the input of the permanent magnet synchronous generator; the output of the permanent magnet synchronous generator is connected to an input of a rectifier module; the output of the multi-power module is connected to the input of the rectifier module; the output of the rectifier module is connected to the DC bus; the input of the power module is connected to the DC bus; one end of the first power switch is connected to one terminal of the DC bus of the electric propulsion subsystem, and the other end is connected to another terminal of the DC bus of another electric propulsion subsystem; after all the DC buses are connected through the first power switch, a closed ring is formed. The advantages are that it has multi-power compatibility, is not limited by the speed fluctuation rate, has a fast response time, and has a wide adjustment range.

Description

Technical Field

[0001] The invention relates to a hybrid power ship DC networking electric propulsion system based on permanent magnet synchronous power generation. Background Art

[0002] At present, the ship power system generally uses AC busbars. The AC grid needs to meet three conditions: phase, voltage, and frequency. At the same time, with the development of power electronics technology, more and more harmonic source devices are used on ships. These devices will feedback harmonics to the grid during operation, reducing the power quality. The ship DC networking system uses a DC busbar. The DC grid only needs voltage as a condition, and the DC grid does not need to consider harmonic interference, which improves system efficiency and design costs.

[0003] At present, the power generation system of the ship power system consists of a diesel engine + asynchronous generator + excitation system + voltage regulator AVR, which supplies power to the AC bus and load. The power generation system uses a speed regulator to adjust the frequency and phase, and an AVR to adjust the voltage for grid connection. The power generation efficiency is low, and it cannot meet the square wave dv / dt. The generator is large in size and weight. The system cannot meet the requirements of the classification society's specifications. When the diesel engine is suddenly loaded with 50% of the rated load under no-load conditions, and the remaining 50% load is added after stabilization, its instantaneous speed regulation is not more than 10% of the rated speed; the stable speed regulation is not more than 5% of the rated speed; the stabilization time, that is, the time for the speed to return to the fluctuation range of ±1%, does not exceed 5s. The system cannot meet the compatibility of multiple power sources and large load impacts. The speed regulators and AVR characteristics of multiple generator sets will deviate, which will lead to the unbundling of the generator sets. The system has low power generation efficiency. Under low load conditions, the efficiency drops to about 0.9; the power factor drops to about 0.75-0.8. Summary of the invention

[0004] The present invention provides a hybrid ship DC networking electric propulsion system based on permanent magnet synchronous power generation, which forms a distributed annular DC bus network through power electronic switches. The number of busbars can be arbitrarily combined as needed to finally form an annular DC bus network, thereby overcoming the defects of the prior art.

[0005] The present invention provides a hybrid ship DC networking electric propulsion system based on permanent magnet synchronous power generation, comprising: a plurality of electric propulsion subsystems 100; the electric propulsion subsystem 100 comprises an engine 1, a permanent magnet synchronous generator 2, a multi-power module 3, a rectifier module 4, a DC bus 11, a power consumption module 110 and a first power switch 5a; the output of the engine 1 is connected to the input of the permanent magnet synchronous generator 2; the output of the permanent magnet synchronous generator 2 is connected to an input of the rectifier module 4; the output of the multi-power module 3 is correspondingly connected to the input of the rectifier module 4; the output of the rectifier module 4 is connected to the DC bus 11; the inputs of the power consumption module 110 are all connected to the DC bus 11; one end of the first power switch 5a is connected to one terminal of the DC bus 11 of the electric propulsion subsystem 100, and the other end is connected to another terminal of the DC bus 11 of another electric propulsion subsystem 100; after all the DC buses 11 are connected through the first power switch 5a, a closed ring is formed.

[0006] Furthermore, the present invention provides a hybrid ship DC networked electric propulsion system based on permanent magnet synchronous power generation, which may also have the following characteristics: the electric propulsion subsystem 100 also includes a second power switch 5b; the second power switch 5b is connected between the other terminal of the DC bus 11 of the electric propulsion subsystem 100 and the first power switch 5a of another electric propulsion subsystem 100, that is, one end of the second power switch 5b is connected to the other terminal of the DC bus 11 of the electric propulsion subsystem 100, and the other end is connected to the other end of the first power switch 5a.

[0007] Furthermore, the present invention provides a hybrid ship DC networked electric propulsion system based on permanent magnet synchronous power generation, which may also have the following characteristics: it also includes a plurality of control switches 200; at least one control switch 200 is arranged between the first power switch 5a of one electric propulsion subsystem 100 and the second power switch 5b of the adjacent electric propulsion subsystem 100.

[0008] Furthermore, the present invention provides a hybrid ship DC networked electric propulsion system based on permanent magnet synchronous power generation, which may also have the following characteristics: the multi-power module 3 includes several power generation modules; the power generation module is any one or more of a photovoltaic power generation module 31, a battery module 32, and a wind power generation module 33.

[0009] Furthermore, the present invention provides a hybrid ship DC networked electric propulsion system based on permanent magnet synchronous power generation, which may also have the following characteristics: the rectifier module 4 includes a motor rectifier module 41 and a plurality of power generation rectifier modules 42; the input of the motor rectifier module 41 is connected to the output of the permanent magnet synchronous generator 2; the power generation rectifier module 42 corresponds one-to-one to the power generation module; the input of the power generation rectifier module 42 is connected to the output of the power generation module; the outputs of the motor rectifier module 41 and the power generation rectifier module 42 are both connected to the DC bus 11.

[0010] Furthermore, the present invention provides a hybrid ship DC networked electric propulsion system based on permanent magnet synchronous power generation, which may also have the following characteristics: the power consumption module 110 includes a power inverter 6 and a load; the input of the power inverter 6 is connected to the DC bus 11; and the output of the power inverter 6 is connected to the load.

[0011] Furthermore, the present invention provides a hybrid ship DC networked electric propulsion system based on permanent magnet synchronous power generation, which may also have the following characteristics: the power consumption module 110 includes an inverter module 7 and a motor group 8; the input of the inverter module 7 is connected to the DC bus 11; the output of the inverter module 7 is connected to the input of the motor group 8.

[0012] Furthermore, the present invention provides a hybrid ship DC networked electric propulsion system based on permanent magnet synchronous power generation, which may also have the following characteristics: the inverter module 7 includes a plurality of inverters; the motor group 8 includes a plurality of permanent magnet synchronous motors; the inverters and permanent magnet synchronous motors correspond one to one; the inputs of the inverters are all connected to the DC bus 11; and the outputs of the inverters are respectively connected to the inputs of the corresponding permanent magnet synchronous motors.

[0013] Furthermore, the present invention provides a hybrid ship DC networked electric propulsion system based on permanent magnet synchronous power generation, which may also have the following characteristics: the output of the motor group 8 supplies power to the propeller 9 and / or the rudder 10.

[0014] The present invention provides a hybrid ship DC networking electric propulsion system based on permanent magnet synchronous power generation. The power supply is compatible with diesel engine power generation system, wind energy, photovoltaic system, and energy storage system, which meets the grid-connected operation of multiple units and multiple energy forms. The system is simple and reliable and occupies a small space, becoming the development direction of a new generation of ship electric propulsion systems. Compared with asynchronous power generation, the system improves efficiency by 10%, reduces volume by 30%, and reduces weight by 35%, avoiding AC grid-connected frequency requirements. The generator set can run at variable speeds according to working conditions, so that the unit efficiency is higher and energy consumption is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a circuit diagram of a hybrid ship DC networking electric propulsion system based on permanent magnet synchronous power generation.

[0016] Figure 2 is a circuit diagram of the electric propulsion subsystem. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] Example

[0019] The hybrid ship DC networked electric propulsion system based on permanent magnet synchronous power generation in this embodiment includes: 4 electric propulsion subsystems 100 and 8 control switches 200.

[0020] In this embodiment, each electric propulsion subsystem 100 includes: an engine 1, a permanent magnet synchronous generator 2, a multi-power module 3, a rectifier module 4, a DC bus 11, a power consumption module 110, a first power switch 5a, a second power switch 5b and a power consumption module 110.

[0021] In this embodiment, the output of the diesel engine 1 is connected to the input of the permanent magnet synchronous generator 2. The multi-power module 3 includes three power generation modules, namely, a photovoltaic power generation module 31, a battery module 32, and a wind power generation module 33. The IGBT rectifier module 4 includes: a motor rectifier module 41 and three power generation rectifier modules 42. The input of the motor rectifier module 41 is connected to the output of the permanent magnet synchronous generator 2. The power generation rectifier module 42 corresponds to the power generation module one by one; the input of the power generation rectifier module 42 is connected to the output of the power generation module. In order to facilitate control, a switch is set between the motor rectifier module 41 and the permanent magnet synchronous generator 2, and a switch is also set between the power generation rectifier module 42 and the power generation module. The switch can be a remote control switch, an induction switch, or of course a manual switch.

[0022] The outputs of the motor rectifier module 41 and the power generation rectifier module 42 of the rectifier module 4 are both connected to the DC bus 11 .

[0023] In this embodiment, the power module 110 includes: a power inverter 6, a load, an inverter module 7 and a motor group 8. The input of the power inverter 6 is connected to the DC bus 11, and the output of the power inverter 6 is connected to the load. The input of the inverter module 7 is connected to the DC bus 11; the output of the inverter module 7 is connected to the input of the motor group 8. In this embodiment, the inverter module 7 includes two inverters; the motor group 8 includes two permanent magnet synchronous motors. The inverter and the permanent magnet synchronous motor correspond one to one; the input of the inverter is connected to the DC bus 11; the output of the inverter is respectively connected to the input of the corresponding permanent magnet synchronous motor. The outputs of the two motor groups 8 supply power to the propeller 9 and the rudder 10 respectively. In order to facilitate control, switches are set between the power inverter 6 and the load, and between the inverter and the permanent magnet synchronous motor. The switch can be a remote control switch, an induction switch, or of course a manual switch.

[0024] In this embodiment, two control switches 200 are arranged between the two electric propulsion subsystems 100 .

[0025] One end of the first power switch 5a in each electric propulsion subsystem 100 is connected to one terminal of the DC bus 11 of the electric propulsion subsystem 100, and the other end of the first power switch 5a is connected to one end of a control switch 200. The other end of the control switch 200 is connected to one end of another control switch 200. The other end of the other control switch is connected to one end of a second power switch 5b in the electric propulsion subsystem 100 adjacent to one side.

[0026] Similarly, one end of the second power switch 5b in each electric propulsion subsystem 100 is connected to the other terminal of the DC bus 11 of the electric propulsion subsystem 100, and the other end of the second power switch 5b is connected to one end of a control switch 200. The other end of the control switch 200 is connected to one end of another control switch 200. The other end of the other control switch is connected to one end of the first power switch 5a in the electric propulsion subsystem 100 adjacent to the other side.

[0027] By analogy, all DC bus bars 11 are connected through the first power switch 5a, the two control switches 200, and the second power switch 5b to form a closed loop.

[0028] The first power switch 5a and the second power switch 5b can be voltage switches or current switches. Under normal use, the first power switch 5a, the two control switches 200, and the second power switch are closed. If a short circuit or other fault occurs in one of the electric propulsion subsystems 100, the instantaneous peak current or voltage exceeds the rated value of the first power switch 5a and the second power switch 5b, the power switch is closed, and the faulty electric propulsion subsystem 100 is separated from the system, and other electric propulsion subsystems 100 still move normally. The control switch 200 can be a remote control switch, an induction switch, or of course a manual switch. If an electric propulsion subsystem 100 is to be inspected and repaired, the control switches 200 on both sides of the electric propulsion subsystem 100 are manually closed to ensure the normal operation of other electric propulsion subsystems 100.

[0029] The invention provides a hybrid ship DC networking electric propulsion system based on permanent magnet synchronous power generation, which adopts a diesel engine + a permanent magnet synchronous generator + a DC frequency converter, and satisfies the requirements of wind energy, a photovoltaic system, and an energy storage system to supply power to a DC busbar at the same time; the diesel engine of the system satisfies both a variable speed governor and a fixed speed governor, and can greatly improve the performance of a ship diesel engine generator set. Compared with a traditional excitation asynchronous generator or a synchronous generator, the permanent magnet synchronous generator is adopted, and the excitation system, the AVR governor, and the filter system are omitted, and the system efficiency is improved by 20%, the volume is reduced by 30%, and the weight is reduced by 35%. The system has the advantages of being simple, efficient, highly reliable, and requiring little maintenance, etc.; the diesel engine of the system has multi-power compatibility, is not limited by the speed fluctuation rate, has a fast response time, and has a wide adjustment range. When the diesel engine set is subjected to a large impact and the speed fluctuation is greater than the specification requirements, the IGBT rectifier has the ability to adjust the speed, frequency, and voltage, and will not cause the diesel generator set to fail to be connected to the grid; the system solves the heat dissipation problem of a high-power permanent magnet generator, and its efficiency is greater than 97%. The voltage regulation range of the IGBT rectifier can reach -20% to +50%, and the stabilization time is within 1S; the system is highly efficient and energy-saving. Under low load conditions, the efficiency is greater than about 0.94 and the power factor is maintained at about 0.9.

[0030] The embodiments described above are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A hybrid ship DC networked electric propulsion system based on permanent magnet synchronous power generation, characterized by: include, a number of electric propulsion subsystems (100); The electric propulsion subsystem (100) comprises an engine (1), a permanent magnet synchronous generator (2), a multi-power module (3), a rectifier module (4), a DC bus (11), a power consumption module (110), and a first power switch (5a); The output of the engine (1) is connected to the input of the permanent magnet synchronous generator (2); The output of the permanent magnet synchronous generator (2) is connected to an input of the rectifier module (4); The output of the multi-power module (3) is correspondingly connected to the input of the rectifier module (4); The output of the rectifier module (4) is connected to the DC bus (11); The inputs of the power consumption modules (110) are all connected to the DC bus (11); One end of the first power switch (5a) is connected to one terminal of the DC bus (11) of the electric propulsion subsystem (100), and the other end is connected to another terminal of the DC bus (11) of another electric propulsion subsystem (100); All the DC busbars (11) are connected through the first power switch (5a) to form a closed loop; The electric propulsion subsystem (100) further comprises a second electric switch (5b); The second power switch (5b) is connected between the other terminal of the DC bus (11) of the electric propulsion subsystem (100) and the first power switch (5a) of another electric propulsion subsystem (100), that is, one end of the second power switch (5b) is connected to the other terminal of the DC bus (11) of the electric propulsion subsystem (100), and the other end is connected to the other end of the first power switch (5a); Also includes a plurality of control switches (200); At least one of the control switches (200) is disposed between the first power switch (5a) of one of the electric propulsion subsystems (100) and the second power switch (5b) of an adjacent electric propulsion subsystem (100); The power consumption module (110) comprises an inverter module (7) and a motor group (8); The input of the inverter module (7) is connected to the DC bus (11); The output of the inverter module (7) is connected to the input of the motor group (8); The inverter module (7) comprises a plurality of inverters; The motor group (8) comprises a plurality of permanent magnet synchronous motors; The inverter and the permanent magnet synchronous motor correspond one to one; The inputs of the inverters are all connected to the DC bus (11); The outputs of the inverters are respectively connected to the inputs of the corresponding permanent magnet synchronous motors; The output of the motor group (8) supplies power to the propeller (9) and / or the rudder (10).

2. The hybrid ship DC networked electric propulsion system based on permanent magnet synchronous power generation according to claim 1, characterized in that: in, The multi-power module (3) comprises a plurality of power generation modules; The power generation module is any one or more of a photovoltaic power generation module (31), a battery module (32), and a wind power generation module (33).

3. The hybrid ship DC networked electric propulsion system based on permanent magnet synchronous power generation as claimed in claim 2, characterized in that: in, The rectifier module (4) comprises a motor rectifier module (41) and a plurality of power generation rectifier modules (42); The input of the motor rectifier module (41) is connected to the output of the permanent magnet synchronous generator (2); The power generation rectifier module (42) corresponds to the power generation module on a one-to-one basis; the input of the power generation rectifier module (42) is connected to the output of the power generation module; The outputs of the motor rectifier module (41) and the power generation rectifier module (42) are both connected to the DC bus (11).

4. The hybrid ship DC networked electric propulsion system based on permanent magnet synchronous power generation according to claim 1, characterized in that: in, The power consumption module (110) comprises a power inverter (6) and a load; The input of the power inverter (6) is connected to the DC bus (11); The output of the power inverter (6) is connected to the load.

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