Multi-source zoned parallel underwater ship AC power supply network and method for substation noise reduction

Abstract

This invention discloses a multi-source, partitioned, parallel underwater AC power supply network and method for substation noise reduction, relating to the field of ship AC power supply. The multi-source, partitioned, parallel underwater AC power supply network for substation noise reduction mainly includes multiple independent power supply zones and an integrated monitoring system. Each independent power supply zone supplies power to the loads in each power supply area of ​​the ship. Each independent power supply zone includes at least one AC power source and an AC distribution board. The 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 each power supply area through multiple AC switches. The AC distribution boards of the multiple independent power supply zones are electrically connected through interconnecting AC switches. The multiple independent power supply zones and the integrated monitoring system are electrically connected. Implementing the multi-source, partitioned, parallel underwater AC power supply network and method for substation noise reduction provided by this invention can improve the power supply reliability of the ship's AC power system.

Description

Technical Field

[0001] This invention relates to the field of AC power supply for ships, and more specifically, to a multi-source zoned parallel underwater ship AC power supply network and method with substation noise reduction. Background Technology

[0002] Traditional shipboard AC power supply networks often employ a single-power centralized supply or a simple parallel redundancy structure. For example, some shipboard AC power supply networks use a single-power source + backup generator power supply mode. Under normal operating conditions, the main AC generator provides power, and in case of a fault, it switches to the backup power source. The switching process relies on mechanical circuit breakers, which introduces switching delays and can lead to short-term power outages in the AC grid. Some shipboard AC grids use a multi-power source non-zonal parallel power supply mode, where multiple power sources are directly connected in parallel to the same bus. For AC synchronization, a centralized synchronization control method is used, with a unified synchronization signal source providing the AC synchronization reference, and all power sources tracking and locking the phase of this synchronization signal. Alternatively, one power source in network configuration mode provides the AC synchronization reference, while other power sources in follow-the-network mode track the output phase of the network power source. For AC network configuration, mechanical or static switches control the power supply path to achieve regional isolation and network reconfiguration. However, this approach has the following drawbacks:

[0003] 1. Insufficient power supply reliability: The centralized synchronous power supply method is highly dependent on a single power source, and the overall power supply reliability has a fatal single point of failure. Failure can easily lead to a power outage of the entire ship. At the same time, local short circuits in the parallel system may trigger cascading failures and related impacts.

[0004] 2. Low reconfiguration efficiency: Backup power switching relies on manual operation or simple timing control, resulting in excessively long recovery time (>500ms); lack of dynamic load balancing strategies, multiple power supplies in parallel, especially under light load conditions, are prone to circulating current or overload.

[0005] 3. Noise reduction in substation areas cannot be selected: The substation power supply must be fully operational, and it is not possible to actively allocate the substation power supply under low energy consumption or high noise reduction requirements, thus making it impossible to selectively achieve noise reduction in substation areas.

[0006] Therefore, how to overcome the shortcomings of existing technologies and improve the power supply reliability of ship electrical system AC networks is an urgent problem to be solved.

[0007] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0008] The purpose of this invention is to provide a multi-source, partitioned, parallel underwater ship AC power supply network and method for substation noise reduction, which can improve the power supply reliability of the ship's power system AC network.

[0009] This invention provides a multi-source, parallel, substation-based AC power supply network for underwater vessels, comprising multiple independent power supply zones and an integrated monitoring system. Each independent power supply zone supplies power to the loads in each power supply area of ​​the vessel. Each independent power supply zone includes at least one AC power source and an AC distribution board. The at least one AC power source supplies power to the AC distribution board via an AC output switch. The AC distribution board supplies power to multiple loads in each power supply zone via multiple AC switches. The AC distribution boards of the multiple independent power supply zones are electrically connected via interconnecting AC switches. The multiple independent power supply zones and the integrated monitoring system are electrically connected.

[0010] Furthermore, the AC distribution board is also connected to another AC output switch, which is used to receive power from an external AC power source on the ship.

[0011] Furthermore, the interconnecting AC switch is a frame-type mechanical switch.

[0012] Furthermore, the interconnecting AC switch is a solid-state switch.

[0013] Furthermore, the solid-state switch is an IGBT-based electronic switch.

[0014] Furthermore, all AC power supplies send a level square wave signal to the synchronization bus. After passing through wired-AND logic, the level square wave signal is used to obtain a falling edge signal. The falling edge signal is used for all AC power supplies to perform synchronous phase-locked regulation as the target phase, thereby achieving phase synchronization of all AC power supplies.

[0015] Furthermore, the ratio of low level to high level in the square wave signal is 1:4.

[0016] Furthermore, the integrated monitoring system is configured as follows: acquire the opening and closing status 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 output power target value after equal distribution. The output power target value includes active power and reactive power. The output power target value is published to each parallel AC power source using a power information network. The output power target value is used for output power feedback tracking control of each parallel AC power source to achieve equal distribution of parallel power.

[0017] Furthermore, the AC power supply is configured such that when the integrated monitoring system malfunctions or the power information network fails, the AC power supply enters a droop mode to ensure that the parallel power of multiple AC power supplies participating in the parallel connection is basically evenly distributed.

[0018] This invention also provides a method for applying the above-mentioned multi-source zoned parallel underwater ship AC power supply network for substation noise reduction. Multiple independent power supply zones include a port bow zone, a port aft zone, a starboard bow zone, and a starboard aft zone. Each independent power supply zone includes an AC power source. The method is characterized in that, when all AC power sources are normally operational, the AC power sources of the port bow zone and the port aft zone are connected in parallel; when only three AC power sources are normally operational, the three AC power sources are connected in parallel; when only two AC power sources are normally operational, the two AC power sources are connected in parallel; and when the entire network is powered down, and at least one AC power source is operating normally, the AC power source with normal output is reclosed.

[0019] The multi-source, zoned, parallel underwater ship AC power supply network and method for substation noise reduction provided by this invention have the following beneficial effects:

[0020] The AC power grid provided by this invention adopts a multi-power source parallel connection method. Through a line-and-logic synchronization bus, multiple AC power sources automatically determine the unique phase information with the most advanced phase. The parallel network synchronization mechanism does not depend on any single link, and AC power sources can be added or removed arbitrarily without affecting the parallel synchronization architecture. The AC power source provided by this invention has a backup droop power sharing mode. When the integrated monitoring system JK or power information network fails, the AC power sources participating in the parallel connection can switch to output droop mode to achieve basic power sharing. This invention conducts a comparative evaluation of optimal flexible networking schemes based on the principle of "redundancy priority, with consideration for zoning" for various AC power source failure modes, and proposes an automatic reclosing scheme, which can effectively improve the power supply reliability of the ship's AC power grid. Simultaneously, based on low-energy consumption conditions or high noise requirements, the number of operating substations can be reduced, thereby reducing vibration and noise caused by transformer or inductor magnetostriction, Lorentz force on conductive busbars, etc., achieving the lowest total noise of the substations under operating conditions.

[0021] The multi-power source parallel connection scheme provided by this invention does not rely on a single link and can ensure normal power supply even under the failure of any AC power source. The multi-power source parallel synchronous power distribution and standby droop distribution mechanism provided by this invention can ensure that the power of multiple AC power sources is evenly distributed when the system is normal. In the event of failure of the integrated monitoring system, the AC power sources can still enter the standby droop mode to ensure normal power supply and basically even power distribution. The flexible AC grid construction and fault reconstruction method provided by this invention can ensure the continuous power supply reliability of the AC grid under various AC power source failure conditions, improve the automatic power supply recovery capability of the AC grid under abnormal power loss, and reduce the number of AC power sources put into operation according to the system's low energy requirements or high quietness requirements, thereby achieving the characteristic of the lowest total noise of the substation power source.

[0022] In summary, this invention improves the power supply reliability of the ship's AC power system network through methods such as parallel connection of multiple power sources, zoned power distribution, and fault reconfiguration. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0024] Figure 1 This is a typical architecture diagram of a multi-power source peer-to-peer parallel ship AC power grid system provided by the present invention;

[0025] Figure 2 This is a schematic diagram of the multi-AC power supply synchronization bus line and logic provided by the present invention;

[0026] Figure 3 This is a flowchart of the multi-power source peer-to-peer synchronous power sharing and backup droop sharing mechanism provided by the present invention.

[0027] Figure 4 This is a flowchart of the AC power grid flexible network construction and fault reconfiguration mechanism provided by the present invention. Detailed Implementation

[0028] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0029] Figure 1 This diagram illustrates a multi-source, parallel, substation-controlled underwater vessel AC power supply network for noise reduction, as described in this embodiment. In this embodiment, the multi-source, parallel, substation-controlled underwater vessel AC power supply network includes multiple independent power supply zones and a comprehensive monitoring system. Each independent power supply zone supplies power to the loads in each power supply area of ​​the vessel. Each independent power supply zone includes at least one AC power source and an AC distribution board. The at least one AC power source supplies power to the AC distribution board via an AC output switch. The AC distribution board supplies power to multiple loads in each power supply area via multiple AC switches. The AC distribution boards of the multiple independent power supply zones are electrically connected via interconnecting AC switches. The multiple independent power supply zones and the comprehensive monitoring system are electrically connected.

[0030] In one exemplary embodiment, the AC distribution board is also connected to another AC output switch, which is used to receive power from an external AC power source on the ship.

[0031] In one exemplary embodiment, the interconnecting AC switch is a frame-type mechanical switch;

[0032] In one exemplary embodiment, the interconnecting AC switch is a solid-state switch;

[0033] In one exemplary embodiment, the solid-state switch is an IGBT-based electronic switch;

[0034] In one exemplary embodiment, all AC power supplies send a level square wave signal to the synchronization bus. The level square wave signal is processed by wired-AND logic to obtain a falling edge signal. The falling edge signal is used for all AC power supplies to perform synchronous phase-locked adjustment as the target phase, thereby achieving phase synchronization of all AC power supplies.

[0035] In one exemplary embodiment, the ratio of low level to high level of the level square wave signal is 1:4;

[0036] In one exemplary embodiment, the integrated monitoring system is configured to: acquire the opening and closing 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 target value of the output power after equal distribution.

[0037] The target output power value includes active power and reactive power;

[0038] The power information network is used to publish the output power target value to each parallel AC power source. The output power target value is used for output power feedback tracking control of each parallel AC power source to achieve equal distribution of parallel power.

[0039] In one exemplary embodiment, the AC power supply is configured such that when the integrated monitoring system malfunctions or the power information network fails, the AC power supply enters a droop mode to achieve a basic equal distribution of the parallel power of multiple AC power supplies participating in the parallel connection.

[0040] This embodiment provides a method for applying the above-mentioned substation noise reduction multi-source zoned parallel underwater ship AC power supply network. The multiple independent power supply zones include a port bow zone, a port aft zone, a starboard bow zone, and a starboard aft zone. Each independent power supply zone includes an AC power source. The method is characterized in that when all AC power sources are normally connected, the AC power sources of the port bow zone and the port aft zone are connected in parallel; when only three AC power sources are normally connected, the three AC power sources are connected in parallel; when only two AC power sources are normally connected, the two AC power sources are connected in parallel; when the entire network is powered down and at least one AC power source is operating normally, the AC power source with normal output is reclosed.

[0041] In some embodiments, the above-described multi-source partitioned parallel underwater ship AC power supply network with substation noise reduction can also be implemented in the following ways.

[0042] The multi-source, zoned, parallel underwater ship AC power supply network for substation noise reduction in this embodiment includes the following core components:

[0043] 1. Multi-Power Supply Zoned Parallel Network Architecture: The ship's AC power supply network is divided into multiple independent power supply zones. For example, it can be divided into at least four zones based on forward, aft, left, and right sides: port forward, starboard forward, port aft, and starboard aft. Alternatively, it can be further subdivided into dedicated power supply zones based on power usage functions, such as propulsion, navigation, and living quarters. Frame-type mechanical switches or solid-state switches (such as IGBT-based electronic switches) are configured between zones to achieve interconnection between adjacent zones or across zones, enabling multi-source power support. For areas with critical loads, two or more power supplies can be configured for parallel supply, or multiple power supplies can be connected in parallel via interconnecting switches. A typical multi-power supply peer-to-peer parallel shipboard AC power grid system architecture is as follows: Figure 1As shown, a typical AC power grid system can be divided into four power supply zones: port aft AC power supply zone Q11, port forward AC power supply zone Q12, starboard aft AC power supply zone Q21, and starboard forward AC power supply zone Q22. Each zone includes AC power sources and distribution boards, while the external components include an integrated monitoring system, loads, and external AC power sources. Regarding AC power supply zone Q11, AC power source D111 supplies power to AC distribution board P11 via AC output switch K111. When the ship is docked, external AC output power source D112 supplies power to AC distribution board P11 via AC switch K112. AC distribution board P11 then supplies power to AC distribution board P11 via AC switch K171. n supplies power to loads F171 to F17n in this area; AC distribution board P11 is connected to AC distribution board P12 in AC power supply area Q12 through AC switches K110 and K120, and AC distribution board P11 is connected to AC distribution board P21 in AC power supply area Q21 through AC switch K12; AC power supply area Q12 has important loads and adopts a dual power supply method. Relatedly, AC power supply D121 supplies power to AC distribution board P12 through AC output switch K121, and AC power supply D122 supplies power to AC distribution board P12 through AC output switch K122. AC distribution board P12 then supplies power to this area through AC switches K181 to K18n respectively. Load F181 is powered to load F18n; AC distribution board P12 is connected to AC distribution board P11 in AC power supply area Q11 via AC switches K120 and K10, and AC distribution board P12 is connected to AC distribution board P22 in AC power supply area Q22 via AC switch K21; related to AC power supply area Q21, AC power supply D211 supplies power to AC distribution board P21 via AC output switch K211. When the ship is docked, external AC power supply D212 supplies power to AC distribution board P21 via AC output switch K212. AC distribution board P21 then supplies power to loads F271 to F18n in this area via AC switches K271 to K27n respectively. 27n power supply; AC distribution board P21 is connected to AC distribution board P22 in AC power supply area Q22 through AC switch K210 and AC switch K220. 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 a dual power supply method. Relatedly, AC power supply D221 supplies power to AC distribution board P22 through AC output switch K221. AC power supply 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.AC distribution board P22 is connected to AC distribution board P21 in AC power supply area Q21 via AC switches K220 and K210. AC distribution board P22 is connected to AC distribution board P12 in AC power supply area Q12 via AC switch K21.

[0044] 2. Multi-power supply equal synchronous power sharing and backup droop sharing mechanism: After connecting multiple areas of the ship through interconnection switches, multiple AC power supplies can be connected in parallel to provide power. When a single AC power supply fails to provide power due to external support conditions (such as cooling water interruption of water-cooled AC power supply, abnormal temperature rise in cabin due to cabin air conditioning failure, water ingress in local cabins, etc.) or its own fault (such as switching device failure, abnormal control board function, control program defects, etc.), the other AC power supplies participating in the parallel connection can still continue to ensure the power supply of the area without interruption, effectively improving the power supply reliability of the area.

[0045] (1) Multiple AC power supplies adopt a peer-to-peer synchronization method. That is, each AC power supply sends a high-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. Multiple square wave signals passing simultaneously through wired-AND logic on the synchronous bus will produce the widest low-level signal, and also the only falling edge signal after the wired-AND logic. This falling edge signal corresponds to the phase with the most leading phase among all AC power supplies. ,like Figure 2 As shown, all AC power supplies can achieve phase synchronization by slowly adjusting the phase lock using the unique falling edge signal after the wired-AND logic as the target phase. This scheme does not depend on any specific power supply or synchronization source device; the entry or exit of any AC power supply does not affect the fact that a unique target phase can always be obtained on the synchronization bus for the AC power supplies participating in the parallel network to perform phase lock synchronization.

[0046] (2) The integrated monitoring system JK analyzes the parallel network and calculates the power distribution. The integrated monitoring system JK can sense the opening and closing status of all interconnected AC switches and AC power output switches. Through network topology analysis, it can obtain the status of all AC power sources participating in parallel power supply to the same AC network, and can calculate the target value of the output power (active power and reactive power) after equal distribution. The integrated monitoring system JK publishes the target value of output power to each parallel AC power source through the power information network. Each parallel AC power source can achieve accurate parallel power distribution by performing output power feedback tracking control.

[0047] (3) When the integrated monitoring system JK malfunctions or the power information network fails, the parallel AC power supply enters droop mode, achieving basic parallel power sharing under the premise of parallel safety. The process of multi-power supply peer-to-peer synchronous power sharing and backup droop sharing mechanism is as follows: Figure 3 As shown;

[0048] 3. Flexible grid construction and fault reconfiguration mechanism for AC power grids:

[0049] (1) The principle of "redundancy first, with consideration for regional division". For AC power grids that require high-reliability power supply, their flexible network construction should follow the principle of "redundancy first, with consideration for regional division". That is, priority should be given to ensuring that a single power supply area has a high-reliability power supply capacity guaranteed by a redundant power supply structure. On the premise that redundant power supply has been ensured, it can be further divided into multiple areas to reduce inter-regional coupling and reduce the risk of power outages across the entire network. At the same time, adopting a multi-power supply parallel redundant power supply method can also improve the system robustness of AC power grids when directly starting large motor loads and facing high-rate short-time starting current.

[0050] Typically, consider as follows Figure 1 The ship's AC power grid is equipped with four AC power supplies. Under conditions of normal operation and partial failure of the AC power supplies, such as... Figure 4 As shown, the integrated monitoring system JK will be flexibly networked according to the following optimal operating modes: ① When all power supplies are in normal operation, the optimal mode is "2+2", that is, the port and starboard sides are each powered by 2 AC power supplies connected in parallel; ② When all 3 engines are in normal operation, the optimal mode is "3", that is, 3 AC power supplies are connected in parallel to power the entire ship, satisfying the "redundancy priority" principle, sacrificing the "zone consideration" requirement, and satisfying the requirement of reducing transformer noise; ③ When 2 engines are in normal operation, the optimal mode is "2", that is, 2 AC power supplies are connected in parallel, satisfying the "redundancy priority" principle, and satisfying the requirement of minimizing transformer noise; The comparative analysis of the network configuration schemes is shown in Table 1:

[0051] Table 1: Comparison and Analysis of Network Construction Schemes

[0052]

[0053] (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 the AC power grid as quickly as possible.

[0054] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A multi-source, zoned, parallel underwater ship AC power supply network for substation noise reduction, characterized in that, The system includes multiple independent power supply zones and an integrated monitoring system. The independent power supply zones supply power to the loads in each power supply area of ​​the ship. Each independent power supply zone includes at least one AC power source and an AC distribution board. The at least one AC power source supplies power to the AC distribution board via an AC output switch. The AC distribution board supplies power to multiple loads in the power supply area via multiple AC switches. The AC distribution boards of the multiple independent power supply zones are electrically connected via interconnecting AC switches. The multiple independent power supply zones are electrically connected to the integrated monitoring system. The AC distribution board is also connected to another AC output switch, which is used to receive power from an external AC power source on the ship. All AC power supplies send a level square wave signal to the synchronization bus. The level square wave signal is processed by wired-AND logic to obtain a falling edge signal. The falling edge signal is used for all AC power supplies to perform synchronous phase-locked adjustment as the target phase, so as to realize the phase synchronization of all AC power supplies. The ratio of low level to high level of the square wave signal is 1:4; The integrated monitoring system is configured to: acquire the opening and closing status of all interconnected AC switches and AC power output switches; utilize 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 evenly distributed output power target value; the output power target value includes active power and reactive power; and use a power information network to publish the output power target value to each parallel AC power source, which is used for output power feedback tracking control of each parallel AC power source to achieve even distribution of parallel power. The AC power supply is configured such that when the integrated monitoring system malfunctions or the power information network fails, the AC power supply enters a droop mode to ensure that the parallel power of multiple AC power supplies participating in the parallel connection is basically evenly distributed.

2. The multi-source zoned parallel underwater ship AC power supply network for substation noise reduction according to claim 1, characterized in that, The interconnecting AC switch is a frame-type mechanical switch.

3. The multi-source zoned parallel underwater ship AC power supply network for substation noise reduction according to claim 1, characterized in that, The interconnecting AC switch is a solid-state switch.

4. The multi-source zoned parallel underwater ship AC power supply network for substation noise reduction according to claim 3, characterized in that, The solid-state switch is an IGBT-based electronic switch.

5. A method for applying a multi-source, partitioned, parallel underwater ship AC power supply network for substation noise reduction as described in any one of claims 1-4, wherein the plurality of independent power supply partitions include a port bow partition, a port aft partition, a starboard bow partition, and a starboard aft partition, and each independent power supply partition includes an AC power source, characterized in that, When all AC power supplies are in normal operation, the AC power supplies of the port forward zone and the port aft zone are connected in parallel; when only 3 AC power supplies are in normal operation, the 3 AC power supplies are connected in parallel; when only 2 AC power supplies are in normal operation, the 2 AC power supplies are connected in parallel; when the entire network is de-energized and at least one AC power supply is operating normally, the AC power supply with normal output is reclosed.

Images