Low-voltage direct-current propulsion driving system

Abstract

The invention discloses a low-voltage direct-current propulsion driving system which comprises a direct-current recommendation driving system, the direct-current recommendation driving system is connected with an alternating-current distribution board through a line, and the other end, away from the direct-current recommendation driving system, of the alternating-current distribution board is connected with a PV array and a generator set through lines. The direct-current recommended driving system comprises a first storage battery and a first direct-current propeller, the first storage battery is in circuit connection with a first charger, a first rectifier, a second rectifier, a second direct-current propeller, a second charger and a second storage battery, and the first direct-current propeller is connected with the first rectifier through a circuit. Unified management is carried out through the alternating-current distribution board, the optimal operation scheme of the power supply is achieved, emission is reduced, and the energy utilization rate is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ship driving, and in particular to a low-voltage direct current propulsion driving system. Background Art

[0002] Although domestic pure electric, LNG and other new energy powered ships have also achieved rapid development in recent years, they are still far from economical, safe and endurance compared with traditional fuels such as heavy oil and diesel. At present, small inland river ships are mainly sightseeing ships and excursion ships. Due to the limited space of such small boats, high-voltage DC networking cannot meet the endurance requirements considering the energy density of the battery. Therefore, more small ships use low-voltage DC propulsion, which can be equipped with corresponding low-voltage large-capacity battery packs to improve endurance. The low-voltage drive system developed by this patent uses clean energy and fossil energy as hybrid power sources for 96V DC drives, which can significantly improve the endurance of ships while reducing emissions, thereby achieving the goal of reducing emissions and increasing efficiency. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a low-voltage DC propulsion drive system, which aims to solve the problem that the space of small boats is limited at the current stage, and when high-voltage DC networking is done, considering the energy density of the battery, the space cannot meet the endurance problem.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a low-voltage DC propulsion drive system, comprising a PV array, a generator set, an AC distribution board and a DC recommended drive system, wherein the DC recommended drive system is connected to the AC distribution board through a line, and the other end of the AC distribution board away from the DC recommended drive system is connected to the PV array and the generator set through a line; the DC recommended drive system comprises a first battery and a first DC thruster, the first battery is respectively connected to a first charger, a first rectifier, a second rectifier, a second DC thruster, a second charger and a second battery line, the first DC thruster is connected to the first rectifier through a line, a first switch is provided between the first battery and the first charger connection line and the first rectifier and the first DC thruster connection line, a second switch is provided between the first rectifier and the first DC thruster connection line and the second rectifier and the second DC thruster connection line, and a third switch is provided between the second rectifier and the second DC thruster connection line and the second charger and the second battery connection line.

[0005] Furthermore, the AC distribution board includes a power management system, which is respectively connected to the first charger, the first battery, the first rectifier, the second rectifier, the second DC propeller, the second charger and the second battery line.

[0006] Further, the PV array includes a first PV array and a second PV array.

[0007] Furthermore, the generator set includes a first generator set and a second generator set, and the connection lines of the power management system are also connected to the first PV array, the first generator set, the second PV array and the second generator set respectively.

[0008] Furthermore, the first charger and the first rectifier are also connected to the first PV array and the first generator set respectively on the other end of the line away from the first battery and the first DC thruster.

[0009] Furthermore, the second rectifier and the second charger are also connected to the second PV array and the second generator set respectively on the other end of the line away from the second DC propulsion device and the second battery.

[0010] Furthermore, a fourth switch is provided between the first generator set and the first rectifier connection line and the second PV array and the second rectifier connection line.

[0011] Compared with the existing technology, the present invention has the following beneficial effects:

[0012] (1) The present invention implements unified management through AC distribution boards to achieve an optimized operation plan for power supply, thereby reducing emissions and improving energy utilization.

[0013] (2) The present invention achieves energy replenishment during the use of electric energy of the first DC thruster and the second DC thruster through the batteries of the first DC thruster and the second DC thruster and the first charger and the second charger.

[0014] (3) The present invention stores clean energy as a power source through a PV array, thereby increasing the continuity and stability of the system's power supply in the process of improving the green environmental protection effect of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The figure is a schematic diagram of the structure of a low-voltage DC propulsion drive system of the present invention.

[0016] Markings in the figure: 1. First PV array; 2. First generator set; 3. Second PV array; 4. Second generator set; 5. AC distribution board; 6. Power management system; 7. DC recommended drive system; 8. First charger; 9. Second charger; 10. First rectifier; 11. Second rectifier; 12. First battery; 13. Second battery; 14. First DC thruster; 15. Second DC thruster; 16. First switch; 17. Second switch; 18. Third switch; 19. Fourth switch. DETAILED DESCRIPTION

[0017] like Figure 1 As shown, the present invention provides a technical solution: a low-voltage DC propulsion drive system, including a PV array, a generator set, an AC distribution board 5 and a DC recommended drive system 7, wherein the DC recommended drive system 7 is connected to the AC distribution board 5 through a line, and the other end of the AC distribution board 5 away from the DC recommended drive system 7 is connected to the PV array and the generator set through a line; the DC recommended drive system 7 includes a first battery 12 and a first DC thruster 14, and the first battery 12 is respectively connected to a first charger 8, a first rectifier 10, a second rectifier 11, a second DC thruster 15, and a second The charger 9 is connected to the second battery 13 by a line, the first DC thruster 14 is connected to the first rectifier 10 by a line, a first switch 16 is provided between the connection line between the first battery 12 and the first charger 8 and the connection line between the first rectifier 10 and the first DC thruster 14, a second switch 17 is provided between the connection line between the first rectifier 10 and the first DC thruster 14 and the connection line between the second rectifier 11 and the second DC thruster 15, and a third switch 18 is provided between the connection line between the second rectifier 11 and the second DC thruster 15 and the connection line between the second charger 9 and the second battery 13.

[0018] The AC distribution board 5 includes a power management system 6, which is respectively connected to the first charger 8, the first battery 12, the first rectifier 10, the second rectifier 11, the second DC propeller 15, the second charger 9 and the second battery 13.

[0019] The PV array includes a first PV array 1 and a second PV array 3 .

[0020] The generator set includes a first generator set 2 and a second generator set 4, and the connection lines of the power management system 6 are also connected to the first PV array 1, the first generator set 2, the second PV array 3 and the second generator set 4 respectively.

[0021] The first charger 8 and the first rectifier 10 are respectively connected to the first PV array 1 and the first generator set 2 on the other end of the line away from the first battery 12 and the first DC thruster 14 .

[0022] The second rectifier 11 and the second charger 9 are respectively connected to the second PV array 3 and the second generator set 4 on the other end of the line away from the second DC propulsion device 15 and the second battery 13 .

[0023] A fourth switch 19 is provided between the connection line between the first generator set 2 and the first rectifier 10 and the connection line between the second PV array 3 and the second rectifier 11 .

[0024] Workflow:

[0025] The solar energy is converted into AC power by the first PV array 1 and the second PV array 3, and transmitted to the AC distribution board 5 as the main power supply for the ship; when the first PV array 1 and the second PV array 3 are insufficient in light intensity due to weather reasons, resulting in the power generation being unable to meet the normal navigation of the ship, the first generator set 2 and the second generator set 4 are started as backup emergency power supplies to supply power to the ship to ensure the normal navigation of the ship. The overall power supply planning strategy is uniformly allocated by the AC distribution board 5, and the power management system 6 manages the electric energy, such as Figure 1 As shown, the power management system 6 is connected to the components of the DC recommendation drive system 7 through lines, and the output power of the first PV array 1, the second PV array 3, the first generator set 2 and the second generator set 4 is matched according to the load-end power consumption. Based on the strategy of giving priority to power supply to the first PV array 1 and the second PV array 3, when the sunlight is sufficient, the first PV array 1 and the second PV array 3 are used as the main power supply for the whole ship, and the first generator set 2 and the second generator set 4 are shut down for standby. When the light intensity is insufficient, according to the current load condition, the power management system 6 decides to start one / two first generator sets 2 and the second generator set 4, and at the same time controls the first generator set 2 and the second generator set 4 to be synchronously connected in parallel to the ship power grid for input, and according to the load, the power management system 6 automatically allocates the strategy for load use.

[0026] The AC distribution board 5 uses a thyristor rectifier to rectify the AC power into 96V DC power to drive the first DC propeller 14 and the second DC propeller 15 to provide power for the ship's navigation; the first charger 8 and the second charger 9 are connected to the AC distribution board 5, and through the power detection of the power management system 6, the surplus power of the first PV array 1 and the second PV array 3 or the first generator set 2 and the second generator set 4 is used to charge the first battery 12 and the second battery 13, thereby improving the energy utilization rate of the ship and reducing energy waste. When the first DC propeller 14 and the second DC propeller 15 are started / accelerated, the power consumption is instantly increased. At this time, the power output of the first rectifier 10 and the second rectifier 11 is not enough to meet the first DC propeller 14 and the second DC propeller 15. The instantaneous power demand of the DC thruster 14 and the second DC thruster 15 is monitored by the power management system 6 under the corresponding working conditions, and a command is issued to cut off the charging output of the first charger 8 and the second charger 9, and terminate the charging state of the first battery 12 and the second battery 13, and at the same time, the connection between the first battery 12 and the second battery 13 and the first DC thruster 14 and the second DC thruster 15 is connected, and the first battery 12 and the second battery 13 are discharged for use by the first DC thruster 14 and the second DC thruster 15, so as to supplement the instantaneous energy difference between the first rectifier 10 and the second rectifier 11, so as to ensure the stable operation of the first DC thruster 14 and the second DC thruster 15, thereby improving the reliability and stability of the propulsion drive system.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low voltage DC propulsion drive system, comprising a PV array, a generator set, an AC switchboard (5) and a DC propulsion drive system (7), characterized in that: The DC recommended drive system (7) is connected to the AC distribution board (5) via a line, and the other end of the AC distribution board (5) away from the DC recommended drive system (7) is connected to the PV array and the generator set via a line; the DC recommended drive system (7) comprises a first battery (12) and a first DC thruster (14), the first battery (12) is respectively connected to the first charger (8), the first rectifier (10), the second rectifier (11), the second DC thruster (15), the second charger (9) and the second battery (13) via a line, and the first DC thruster (14) is connected to the first The rectifiers (10) are connected via lines, a first switch (16) is provided between a connection line between a first storage battery (12) and a first charger (8) and a connection line between a first rectifier (10) and a first DC thruster (14), a second switch (17) is provided between a connection line between a first rectifier (10) and a first DC thruster (14) and a connection line between a second rectifier (11) and a second DC thruster (15), and a third switch (18) is provided between a connection line between a second rectifier (11) and a second DC thruster (15) and a connection line between a second charger (9) and a second storage battery (13).

2. A low voltage DC propulsion drive system according to claim 1, characterized in that: The AC distribution board (5) comprises a power management system (6), which is respectively connected to the first charger (8), the first storage battery (12), the first rectifier (10), the second rectifier (11), the second DC propulsion device (15), the second charger (9) and the second storage battery (13).

3. A low voltage DC propulsion drive system according to claim 2, characterized in that: The PV array comprises a first PV array (1) and a second PV array (3).

4. A low voltage DC propulsion drive system according to claim 3, characterized in that: The generator set comprises a first generator set (2) and a second generator set (4), and the connection lines of the power management system (6) are respectively connected to the first PV array (1), the first generator set (2), the second PV array (3) and the second generator set (4).

5. A low voltage DC propulsion drive system according to claim 4, characterized in that: The first charger (8) and the first rectifier (10) are respectively connected to the first PV array (1) and the first generator set (2) on the other end of the line away from the first storage battery (12) and the first DC propulsion device (14).

6. A low voltage DC propulsion drive system according to claim 5, characterized in that: The second rectifier (11) and the second charger (9) are respectively connected to the second PV array (3) and the second generator set (4) on the other end of the line away from the second DC propulsion device (15) and the second storage battery (13).

7. A low voltage DC propulsion drive system according to claim 6, characterized in that: A fourth switch (19) is provided between the connection line between the first generator set (2) and the first rectifier (10) and the connection line between the second PV array (3) and the second rectifier (11).

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