Power transformation noise reduction multi-source partition parallel underwater ship alternating current power supply network and method

Abstract

The invention discloses a power transformation noise reduction multi-source subarea parallel underwater ship alternating current power supply network and method, and relates to the field of ship alternating current power supply, and the power transformation noise reduction multi-source subarea parallel underwater ship alternating current power supply network mainly comprises a plurality of independent power supply subareas and a comprehensive monitoring system. The independent power supply subareas are used for supplying power to loads of all power supply areas of the ship; the independent power supply subarea comprises at least one alternating current power supply and an alternating current distribution board, and the at least one alternating current power supply supplies power to the alternating current distribution board through an alternating current output switch; the AC distribution board supplies power to the plurality of loads in the power supply area through the plurality of AC switches. The alternating current distribution boards of the plurality of independent power supply subareas are electrically connected through an interconnected alternating current switch; and the plurality of independent power supply subareas are electrically connected with the comprehensive monitoring system. By implementing the power transformation noise reduction multi-source partition parallel underwater ship alternating current power supply network and method provided by the invention, the power supply reliability of the ship power system alternating current network can be improved.

Description

Technical Field

[0001] The present invention relates to the field of ship AC power supply, and more particularly to a multi-source partitioned parallel underwater ship AC power supply network and method for power transformation and noise reduction. Background Art

[0002] Traditional ship AC power supply networks mostly use a single power supply centralized power supply or a simple parallel redundant structure. For example, some ship AC power supply networks use a single power supply + backup generator power supply mode. Under normal working conditions, the AC main generator supplies power and switches to the backup power supply in case of a fault. The switching process relies on mechanical circuit breakers, and there is a switching delay, which will cause the AC grid to lose power temporarily. Some ship AC grids use a multi-power non-partitioned parallel power supply mode. Multiple power supplies are directly connected in parallel to the same bus. In terms of AC synchronization, a centralized synchronization control method is used. A unified synchronization signal source provides an AC synchronization reference, and all power supplies track and lock the phase of the synchronization signal. Alternatively, one power supply provides an AC synchronization reference in the networking mode, and other power supplies track the output phase of the networking power supply in the following mode. In terms of AC networking, mechanical or static switches are used to control the power supply path to achieve regional isolation and network reconstruction. However, it has the following defects: 1. Insufficient power supply reliability: The centralized synchronous power supply method is highly dependent on a single power source. There is a fatal single point of failure in the reliability of the power supply of the entire network. Failure can easily lead to power outage of the entire ship. At the same time, local short circuit points in the parallel system may cause cascading failures and implicated impacts.

[0003] 2. Low reconstruction efficiency: Backup power switching relies on manual operation or simple timing control, resulting in a long recovery time (>500ms). There is a lack of dynamic load balancing strategies, and multiple power sources in parallel, especially multiple machines with light loads, are prone to circulating current or overload.

[0004] 3. Unable to select noise reduction in the substation area: The substation power supply must be fully put into use. It is impossible to actively adjust the substation power supply under low energy consumption conditions or high noise requirements to selectively achieve noise reduction in the substation area.

[0005] Therefore, how to overcome the shortcomings of existing technologies and improve the power supply reliability of the AC network of the ship's power system is an urgent problem to be solved.

[0006] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0007] The purpose of the present invention is to provide a multi-source partitioned parallel underwater ship AC power supply network and method with power transformation and noise reduction, which can improve the power supply reliability of the ship's power system AC network.

[0008] The present invention provides a multi-source partitioned parallel underwater ship AC power supply network with power transformation and noise reduction, comprising a plurality of independent power supply partitions and an integrated monitoring system, wherein the independent power supply partitions are used to supply power to loads in each power supply area of the ship; the independent power supply partitions comprise at least one AC power supply and an AC distribution board, wherein at least one AC power supply supplies power to the AC distribution board via an AC output switch; the AC distribution board supplies power to a plurality of loads in the power supply area via a plurality of AC switches; the AC distribution boards of the plurality of independent power supply partitions are electrically connected via interconnected AC switches; and the plurality of independent power supply partitions are electrically connected to the integrated monitoring system.

[0009] Furthermore, the AC distribution board is also connected to another AC output switch, and the other AC output switch is used to receive power from an AC power source outside the ship.

[0010] Furthermore, the interconnected AC switch is a frame-type mechanical switch.

[0011] Furthermore, the interconnected AC switch is a solid-state switch.

[0012] Furthermore, the solid-state switch is an IGBT-based electronic switch.

[0013] Furthermore, all AC power supplies send a level square wave signal to the synchronization bus. The level square wave signal obtains a falling edge signal after line-and logic. The falling edge signal is used for all AC power supplies as the target phase for synchronous phase-locked adjustment to achieve phase synchronization of all AC power supplies.

[0014] Furthermore, the ratio of the low level to the high level of the level square wave signal is 1:4.

[0015] Furthermore, the integrated monitoring system is configured to: obtain the on / off status of all interconnected AC switches and AC power output switches, use network topology analysis to obtain the status of all AC power supplies participating in parallel power supply to the same AC network, and calculate the output power target value after equalization; the output power target value includes active power and reactive power; use the power information network to publish the output power target value to each parallel AC power supply, and the output power target value is used for output power feedback tracking control of each parallel AC power supply to achieve parallel power equalization.

[0016] Furthermore, the AC power supply is configured such that when the integrated monitoring system operates abnormally or the power information network fails, the AC power supply enters a droop mode to achieve substantially equal distribution of the parallel power of the multiple AC power supplies in parallel.

[0017] The present invention also provides a method for a multi-source partitioned parallel underwater ship AC power supply network applied to the above-mentioned power transformation noise reduction, wherein the multiple independent power supply partitions include a port front partition, a port rear partition, a starboard front partition, and a starboard rear partition, and each independent power supply partition includes an AC power supply. The method is characterized in that when all AC power supplies are normally put into operation, the AC power supplies of the port front partition and the port rear partition are connected for power supply in parallel; when only three AC power supplies are normally put into operation, the three AC power supplies are connected for power supply in parallel; when only two AC power supplies are normally put into operation, the two AC power supplies are connected for power supply in parallel; when the entire network is powered off and the output of at least one AC power supply is normal, the AC power supply with normal output is reclosed.

[0018] The multi-source partitioned parallel underwater ship AC power supply network and method for power conversion and noise reduction provided by the present invention have the following beneficial effects: The AC power grid provided by the present invention adopts a multi-power supply equal parallel mode, and realizes that multiple AC power supplies automatically determine the unique phase information with the most advanced phase through a line and logic synchronization bus, and the network synchronization mechanism does not depend on a single link, and the AC power supply can be arbitrarily added or removed without affecting the parallel synchronization architecture; the AC power supply provided by the present invention has a standby droop power sharing mode. When the integrated monitoring system JK or the power information network fails, the AC power supplies participating in the parallel connection can be switched to the output droop mode to achieve basic power sharing; the present invention conducts a comparative evaluation of the optimal flexible networking scheme based on the principle of "redundancy first, taking into account partitioning" for various AC power supply failure modes, and proposes an automatic reclosing scheme, which can effectively provide power supply reliability for ship AC power grids; at the same time, according to low energy consumption conditions or high quietness requirements, the number of substations in operation can be reduced, thereby reducing the vibration noise caused by the magnetostriction of the transformer or inductor, the Lorentz force of the conductive busbar, etc. inside the substation equipment, and achieving the lowest total noise of the substation under operating conditions.

[0019] The multi-power supply equal parallel connection scheme provided by the present invention does not rely on a single link, and can ensure normal power supply in the event of any AC power failure; the multi-power supply equal synchronous power distribution combined with the standby droop equalization mechanism provided by the present invention can ensure that the power of multiple AC power supplies is evenly distributed when the system is normal. When the integrated monitoring system fails, the AC power supply can still enter the standby droop mode to ensure normal power supply and basic power distribution; the AC power grid flexible networking and fault reconstruction method provided by the present invention can ensure the continuous power supply reliability of the AC power grid under various AC power supply failure conditions, improve the automatic power supply recovery capability of the AC power grid in the event of abnormal power failure, and can also reduce the AC power supplies put into operation according to the system's low energy working conditions or high silent requirements, so as to obtain the lowest total noise characteristic of the substation power supply.

[0020] In summary, the present invention improves the power supply reliability of the AC network of the ship's power system by means of equal parallel connection of multiple power sources, zoned power distribution and fault reconstruction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which: Figure 1 This is a typical architecture diagram of a multi-power supply equal parallel ship AC power grid system provided by the present invention; Figure 2 It is a schematic diagram of the multi-AC power supply synchronization bus line and logic provided by the present invention; Figure 3 This is a flow chart of the multi-power supply peer-to-peer synchronous power sharing and standby droop sharing mechanism provided by the present invention; Figure 4 This is a flow chart of the flexible networking and fault reconstruction mechanism of the AC power grid provided by the present invention. DETAILED DESCRIPTION

[0022] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0023] Figure 1 A schematic diagram of a multi-source partitioned parallel underwater ship AC power supply network for power conversion and noise reduction in this embodiment is shown. In this embodiment, the multi-source partitioned parallel underwater ship AC power supply network for power conversion and noise reduction includes multiple independent power supply partitions and an integrated monitoring system. The independent power supply partitions are used to supply power to the loads in each power supply area of the ship; the independent power supply partitions include at least one AC power source and an AC distribution board, and at least one AC power source supplies power to the AC distribution board through an AC output switch; the AC distribution board supplies power to multiple loads in the power supply area through multiple AC switches; the AC distribution boards of multiple independent power supply partitions are electrically connected via interconnected AC switches; and the multiple independent power supply partitions are electrically connected to the integrated monitoring system. In an exemplary embodiment, the AC distribution board is further connected to another AC output switch, and the other AC output switch is used to receive power from an AC power source outside the ship; In an exemplary embodiment, the interconnected AC switch is a frame-type mechanical switch; In an exemplary embodiment, the interconnect AC switch is a solid-state switch; In one exemplary embodiment, the solid-state switch is an IGBT-based electronic switch; In an exemplary embodiment, each AC power source sends a level square wave signal to the synchronization bus. The level square wave signal is subjected to line-AND logic to obtain a falling edge signal. The falling edge signal is used to perform synchronous phase-locked adjustment on all AC power sources as the target phase, thereby achieving phase synchronization of all AC power sources. In an exemplary embodiment, the ratio of the low level to the high level of the level square wave signal is 1:4; In an exemplary embodiment, the integrated monitoring system is configured to: obtain the open and closed states of all interconnected AC switches and AC power output switches, use network topology analysis to obtain the status of all AC power sources participating in parallel power supply to the same AC network, and calculate the target output power value after equalization; The output power target value includes active power and reactive power; The power information network is used to issue output power target values to each parallel AC power source. The output power target values are used for output power feedback tracking control of each parallel AC power source to achieve parallel power sharing. In an exemplary embodiment, the AC power supply is configured such that: when the integrated monitoring system operates abnormally or the power information network fails, the AC power supply enters a droop mode to achieve substantially equal distribution of the parallel power of the multiple AC power supplies participating in parallel; The present embodiment provides a method for a multi-source partitioned parallel underwater ship AC power supply network applied to the above-mentioned power transformation noise reduction, wherein the multiple independent power supply partitions include a port front partition, a port rear partition, a starboard front partition, and a starboard rear partition, and each independent power supply partition includes an AC power supply. The method is characterized in that when all AC power supplies are normally put into operation, the AC power supplies of the port front partition and the port rear partition are supplied in parallel; when only three AC power supplies are normally put into operation, the three AC power supplies are supplied in parallel; when only two AC power supplies are normally put into operation, the two AC power supplies are supplied in parallel; when the entire network is powered off and the output of at least one AC power supply is normal, the AC power supply with normal output is reclosed.

[0024] In some embodiments, the multi-source partitioned parallel underwater ship AC power supply network for power transformation and noise reduction can also be implemented in the following manner.

[0025] The multi-source partitioned parallel underwater ship AC power supply network for power conversion and noise reduction in this embodiment includes the following core parts: 1. Multi-power partition parallel networking architecture: Divide the AC power supply network of the entire ship into multiple independent power supply partitions, such as at least four power supply partitions: front left, front right, rear left, and rear right, according to the front, back, left, and right directions, or further subdivide into dedicated power supply partitions according to power consumption functions, such as propulsion partitions, navigation partitions, and living partitions. Frame-type mechanical switches or solid-state switches (such as IGBT-based electronic switches) are configured between partitions to achieve interconnection between adjacent partitions or across regions, and realize multi-source power support; for areas where important loads are located, more than two power supplies can be configured for parallel power supply, or multiple power supplies can be connected in parallel through interconnected switches. A typical multi-power peer-to-peer parallel ship AC power grid system architecture is as follows: Figure 1As shown in FIG, a typical AC power grid system can be divided into four power supply areas, namely, the ship's left rear AC power supply area Q11, the ship's left front AC power supply area Q12, the ship's right rear AC power supply area Q21, and the ship's right front AC power supply area Q22. Each area includes an AC power source and a distribution board, and the outside of the area includes an integrated monitoring system, loads, and the ship's external AC power source. Regarding the AC power supply area Q11, the AC power source D111 supplies power to the AC distribution board P11 through the AC output switch K111. When the ship is moored at the dock, the ship's external AC output power source D112 supplies power to the AC distribution board P11 through the AC switch K112. The AC distribution board P11 then supplies power to the AC switch K171 through the AC switch K172. n supplies power to loads F171 to F17n in the area; the AC distribution board P11 is connected to the AC distribution board P12 in the AC power supply area Q12 through the AC switch K110 and the AC switch K120, and the AC distribution board P11 is connected to the AC distribution board P21 in the AC power supply area Q21 through the AC switch K12; the AC power supply area Q12 has important loads and adopts a dual power supply mode. In relation to it, the AC power supply D121 supplies power to the AC distribution board P12 through the AC output switch K121, and the AC power supply D122 supplies power to the AC distribution board P12 through the AC output switch K122. The AC distribution board P12 then supplies power to the area through the AC switches K181 to K18n. The load F181 is supplied to the load F18n; the AC distribution board P12 is connected to the AC distribution board P11 in the AC power supply area Q11 through the AC switch K120 and the AC switch K10, and the AC distribution board P12 is connected to the AC distribution board P22 in the AC power supply area Q22 through the AC switch K21; related to the AC power supply area Q21, the AC power supply D211 supplies power to the AC distribution board P21 through the AC output switch K211. When the ship is moored at the dock, the AC power supply D212 outside the ship supplies power to the AC distribution board P21 through the AC output switch K212. The AC distribution board P21 then supplies power to the load F271 in the area through the AC switch K271 to the AC switch K27n. 27n power supply; AC distribution board P21 is connected to AC distribution board P22 in AC power supply area Q22 through AC switches K210 and K220, and AC distribution board P21 is connected to AC distribution board P11 in AC power supply area Q11 through AC switch K12; AC power supply area Q22 has important loads and adopts dual power supply mode. Related to it, AC power source D221 supplies power to AC distribution board P22 through AC output switch K221, and AC power source D222 supplies power to AC distribution board P22 through AC output switch K222. AC distribution board P22 then supplies power to loads F281 to F28n in this area through AC switches K281 to K28n respectively;The AC distribution board P22 is connected to the AC distribution board P21 in the AC power supply area Q21 through the AC switch K220 and the AC switch K210. The AC distribution board P22 is connected to the AC distribution board P12 in the AC power supply area Q12 through the AC switch K21.

[0026] 2. Multi-power source peer-to-peer synchronous power sharing and standby droop sharing mechanism: By interconnecting multiple areas of the ship through switches, multiple AC power sources can be connected in parallel for power supply. If a single AC power source fails due to external support conditions (such as cooling water interruption for water-cooled AC power sources, abnormal cabin temperature rise caused by cabin air conditioning failure, water ingress into local cabins, etc.) or internal faults (such as switch component failure, control board malfunction, control program defects, etc.), the other parallel AC power sources can continue to provide uninterrupted power to the area, effectively improving the power supply reliability of the area. (1) Multiple AC power supplies adopt a peer-to-peer synchronization mode. That is, each AC power supply sends a high and low level square wave signal representing its own phase to the synchronization bus, with the ratio of low level to high level being 1:4, and the falling edge corresponding to the phase of its own output AC voltage. When multiple square wave signals pass through the wired AND logic on the synchronous bus at the same time, the widest low-level signal will be obtained. At the same time, the only falling edge signal after the wired AND logic will be obtained. This falling edge signal corresponds to the most advanced phase among all AC power supplies. ,like Figure 2 As shown. All AC power sources are slowly synchronized and phase-locked using the unique falling edge signal after the line-AND logic as the target phase. This solution is independent of a specific power source or synchronization source device. The addition or removal of any AC power source from the network does not affect the unique target phase always available on the synchronization bus, enabling synchronization and phase locking of all AC power sources in the parallel network. (2) The integrated monitoring system JK analyzes the parallel network and calculates the shared power. The integrated monitoring system JK can sense the on / off status of all interconnected AC switches and AC power output switches. Through network topology analysis, it can obtain the status of all AC power supplies participating in the parallel supply of power to the same AC network and calculate the target value of the output power (active power, reactive power) after sharing. The integrated monitoring system JK publishes the output power target value to each parallel AC power source through the power information network. Each parallel AC power source performs output power feedback tracking control to achieve accurate parallel power sharing. (3) When the integrated monitoring system JK works abnormally or the power information network fails, the parallel AC power supply enters the droop mode, and realizes the basic parallel power sharing under the premise of parallel safety. The process of multi-power peer synchronous power sharing and standby droop sharing mechanism is as follows: Figure 3 As shown; 3. Flexible AC grid configuration and fault reconstruction mechanism: (1) The principle of "redundancy first, taking into account zoning". For AC power grids that require high-reliability power supply, their flexible network construction should follow the principle of "redundancy first, taking into account zoning", that is, priority should be given to ensuring that a single power supply area should have a high-reliability power supply capacity guaranteed by a redundant power supply structure. On the premise that redundant power supply has been ensured, further consideration can be given to dividing it into multiple areas to reduce coupling between areas and reduce the risk of power outages in the entire network. At the same time, the use of multiple power supplies in parallel for redundant power supply can also improve the system robustness when the AC power grid directly starts large motor loads in the face of high-rate short-term starting currents; Typically, consider Figure 1 The ship's AC power grid is equipped with 4 AC power supplies. When the AC power supply is normal or partially faulty, Figure 4 As shown in the figure, the integrated monitoring system JK will be flexibly networked according to the following optimal operating modes: ① When all power sources are put into operation normally, the optimal mode is "2+2", that is, the port and starboard sides are respectively supplied with power by two AC power sources in parallel; ② When three units are put into operation normally, the optimal mode is "3", that is, the three AC power sources are connected in parallel to supply power to the entire ship, meeting the principle of "redundancy first", giving up the requirement of "taking into account partitions", and ensuring the reduction of substation noise; ③ When two units are put into operation normally, the optimal mode is "2", that is, the two AC power sources are connected in parallel to supply power, meeting the principle of "redundancy first" and ensuring the lowest substation noise. The comparative analysis of the network construction schemes is shown in Table 1: Table 1: Comparative analysis of network solutions

[0027] (2) Automatic reclosing: When the integrated monitoring system JK detects that the entire network is out of power and there is still normal AC power output, it should try to automatically restart the AC power output switch as soon as possible to restore power to the AC grid as soon as possible.

[0028] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A multi-source partitioned parallel underwater ship AC power supply network for power transformation and noise reduction, characterized by: It includes multiple independent power supply partitions and an integrated monitoring system. The independent power supply partitions are used to supply power to the loads in each power supply area of the ship; the independent power supply partitions include at least one AC power supply and an AC distribution board, and the at least one AC power supply supplies power to the AC distribution board through an AC output switch; the AC distribution board supplies power to multiple loads in the power supply area through multiple AC switches; the AC distribution boards of the multiple independent power supply partitions are electrically connected through interconnected AC switches; and the multiple independent power supply partitions are electrically connected to the integrated monitoring system.

2. The multi-source partitioned parallel underwater ship AC power supply network for power conversion and noise reduction according to claim 1 is characterized in that: The AC distribution board is also connected to another AC output switch, and the other AC output switch is used to receive power from an AC power source outside the ship.

3. The multi-source partitioned parallel underwater ship AC power supply network for power transformation and noise reduction according to claim 1 is characterized in that: The interconnected AC switch is a frame-type mechanical switch.

4. The multi-source partitioned parallel underwater ship AC power supply network for power conversion and noise reduction according to claim 1 is characterized in that: The interconnected AC switch is a solid-state switch.

5. The multi-source partitioned parallel underwater ship AC power supply network for power transformation and noise reduction according to claim 4 is characterized in that: The solid-state switch is an IGBT-based electronic switch.

6. The multi-source partitioned parallel underwater ship AC power supply network for power conversion and noise reduction according to claim 1 is characterized in that: All the AC power supplies send a level square wave signal to the synchronous bus. The level square wave signal obtains a falling edge signal after the line-AND logic. The falling edge signal is used for all the AC power supplies to perform synchronous phase-locked adjustment as the target phase to achieve phase synchronization of all the AC power supplies.

7. The multi-source partitioned parallel underwater ship AC power supply network for power conversion and noise reduction according to claim 6 is characterized in that: The ratio of the low level to the high level of the level square wave signal is 1:

4.

8. The multi-source partitioned parallel underwater ship AC power supply network for power conversion and noise reduction according to claim 1 is characterized in that: The integrated monitoring system is configured to: obtain the on / off status of all interconnected AC switches and AC power output switches, use network topology analysis to obtain the status of all AC power supplies participating in parallel power supply to the same AC network, and calculate the output power target value after equalization; the output power target value includes active power and reactive power; use the power information network to publish the output power target value to each parallel AC power supply, and the output power target value is used for output power feedback tracking control of each parallel AC power supply to achieve parallel power equalization.

9. The multi-source partitioned parallel underwater ship AC power supply network for power transformation and noise reduction according to claim 1 is characterized in that: The AC power supply is configured such that when the integrated monitoring system operates abnormally or the power information network fails, the AC power supply enters a droop mode to achieve substantially equal distribution of the parallel power of the multiple AC power supplies in parallel.

10. A method for a multi-source partitioned parallel underwater ship AC power supply network for power conversion and noise reduction according to any one of claims 1 to 9, wherein the multiple independent power supply partitions include a port front partition, a port rear partition, a starboard front partition, and a starboard rear partition, and each independent power supply partition includes an AC power supply, characterized in that: When all AC power sources are operating normally, the AC power sources of the port front partition and the port rear partition are connected in parallel to supply power; when only three AC power sources are operating normally, the three AC power sources are connected in parallel to supply power; when only two AC power sources are operating normally, the two AC power sources are connected in parallel to supply power; when the entire network is powered off and the output of at least one AC power source is normal, the AC power source with normal output is reclosed.

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