Electric propulsion system and control method for a multi-purpose research vessel

Abstract

An electric propulsion system and control method for a multi-functional research vessel are provided. The electric propulsion system includes a first power supply module and a second power supply module. Each power supply module includes at least two generator sets, an AC distribution board, and switches corresponding to each generator set. Each generator set is connected in parallel to the AC distribution board via its corresponding switch. The AC distribution board is connected to the podded thruster and the bow thruster, respectively. A connecting switch is also included between the first and second power supply modules. Each switch and the connecting switch can selectively turn on or off according to operating conditions to select at least one generator set from the first and / or second power supply modules to operate, and to enable the operating generator set to supply power to the podded thruster and / or the bow thruster of its corresponding power supply module. This system and method can meet the propulsion needs of a multi-functional research vessel under various navigation conditions.

Description

Technical Field

[0001] This invention relates to the field of multi-functional scientific research vessels and belongs to the field of automated control technology for marine power systems. Background Technology

[0002] As countries around the world increase their efforts to explore marine and polar resources, multi-functional research vessels are often required to perform a variety of tasks. An increasing number of research vessels are choosing to use electric power systems.

[0003] Because multi-functional research vessels have complex equipment components and operate under various conditions, such as normal navigation, port entry and exit, icebreaking, dynamic positioning, and underwater operations, their electric propulsion systems must be able to meet their power requirements under all operating conditions without wasting energy. Summary of the Invention

[0004] One object of the present invention is to provide an electric propulsion system for a multi-functional research vessel that can meet the propulsion needs of the multi-functional research vessel under various navigation conditions.

[0005] The electric propulsion system for achieving the above objectives includes: a first power supply module comprising at least two generator sets, a first AC distribution board, and switches corresponding to each generator set, wherein each generator set is connected in parallel to the first AC distribution board via a corresponding switch, and the first AC distribution board is connected to a first pod thruster and a first bow thruster; a second power supply module comprising at least two generator sets, a second AC distribution board, and switches corresponding to each generator set, wherein each generator set is connected in parallel to the second AC distribution board via a corresponding switch, and the second AC distribution board is connected to a second pod thruster and a second bow thruster; and a connecting switch disposed between the first power supply module and the second power supply module; wherein each switch and the connecting switch are selectively turned on or off according to operating conditions to select at least one generator set from the first power supply module and / or the second power supply module to be put into operation, and to enable the generator set in operation to supply power to the pod thruster and / or bow thruster of its corresponding power supply module.

[0006] In one or more embodiments, the first power supply module and the second power supply module are configured such that one of them supplies power to the other through the interconnecting switch.

[0007] In one or more embodiments, the first power supply module includes a first main generator set, a second main generator set, a first closing switch, and a second closing switch. The first main generator set is connected to the first AC distribution board via the first closing switch, and the second main generator set is connected to the first AC distribution board via the second closing switch. The second power supply module includes a third main generator set, a fourth main generator set, a fourth closing switch, and a fifth closing switch. The third main generator set is connected to the second AC distribution board via the fourth closing switch, and the fourth main generator set is connected to the second AC distribution board via the fifth closing switch.

[0008] In one or more embodiments, the first power supply module further includes a first bow thruster soft starter cabinet disposed upstream of the first bow thruster, the first AC distribution board being connected to the first bow thruster soft starter cabinet via a switch to selectively supply power to the first bow thruster; the second power supply module further includes a second bow thruster soft starter cabinet disposed upstream of the second bow thruster, the second AC distribution board being connected to the second bow thruster soft starter cabinet via a switch to selectively supply power to the second bow thruster.

[0009] In one or more embodiments, the first power supply module further includes a first phase-shifting transformer disposed upstream of the first pod thruster, and the first AC distribution board is connected to the first phase-shifting transformer via a switch to selectively supply power to the first pod thruster; the second power supply module further includes a second phase-shifting transformer disposed upstream of the second pod thruster, and the second AC distribution board is connected to the second phase-shifting transformer via a switch to selectively supply power to the second pod thruster.

[0010] Another object of the present invention is to improve an electric propulsion control method for a multi-functional research vessel, the method comprising: acquiring the operating conditions of the multi-functional research vessel; determining the propulsion power requirement based on the operating conditions; identifying a target generator set to be put into operation from the generator sets of the first power supply module and / or the second power supply module, and identifying a target thruster to be put into operation from the first pod thruster, the second pod thruster, the first bow thruster, and the second bow thruster; starting the target generator set and closing the switch corresponding to the target generator set, so that the target generator set is electrically connected to the first AC distribution board and / or the second AC distribution board, so that the first AC distribution board and / or the second AC distribution board supplies power to the target thruster, thereby enabling the target thruster to operate.

[0011] In one or more embodiments, the method further includes the following steps: selecting a zoned power supply mode or a tie-line power supply mode according to the operating conditions; in the zoned power supply mode, disconnecting the tie switch to supply power to the target generator set in the first power supply module to the target propeller connected to the first AC distribution board, and / or supplying power to the target propeller connected to the second AC distribution board by the target generator set in the second power supply module; in the tie-line power supply mode, closing the tie switch to connect the first AC distribution board and the second AC distribution board, so that any target generator set in the first power supply module or the second power supply module simultaneously supplies power to the first AC distribution board and the second AC distribution board.

[0012] In one or more embodiments, under normal navigation conditions, the electric propulsion control method includes: activating at least one generator set in the first power supply module and supplying power to the first pod thruster through the first AC distribution board; activating at least one generator set in the second power supply module and supplying power to the second pod thruster through the second AC distribution board; and keeping the communication switch off.

[0013] In one or more embodiments, under icebreaking or dynamic positioning heavy-load conditions, the electric propulsion control method includes: activating at least two generator sets selected from the first power supply module and supplying power to the first bow thruster and the first pod thruster through the first AC distribution board; activating at least two generator sets selected from the second power supply module and supplying power to the second bow thruster and the second pod thruster through the second AC distribution board; and keeping the interconnection switch open.

[0014] In one or more embodiments, during port entry and exit operations, the electric propulsion control method includes: activating at least one generator set in the first power supply module and supplying power to the first bow thruster via the first AC distribution board; activating at least one generator set in the second power supply module and supplying power to the second bow thruster via the second AC distribution board; and keeping the tie switch open.

[0015] In one or more embodiments, under dynamic positioning light-load conditions, the electric propulsion control method includes: selecting a generator set in the first power supply module to start operation and simultaneously supplying power to the first bow thruster and the first pod thruster through the first AC distribution board; selecting a generator set in the second power supply module to start operation and simultaneously supplying power to the second bow thruster and the second pod thruster through the second AC distribution board; and keeping the interconnection switch open.

[0016] In one or more embodiments, under underwater operating conditions, the electric propulsion control method includes: putting at least one generator set of the first power supply module or at least one generator set of the second power supply module into operation; closing the interconnection switch to connect the first AC distribution board and the second AC distribution board; and simultaneously supplying power to the first pod thruster and the second pod thruster by the generator set.

[0017] The aforementioned electric propulsion system and method enable different power supply modules to selectively operate in zones or in conjunction with each other according to operating conditions, and to select the appropriate number of generator sets, thrusters, and different power supply paths to operate according to propulsion power requirements, thereby meeting the propulsion power requirements of the multi-functional research vessel under different operating conditions without wasting energy. Attached Figure Description

[0018] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the overall structure of an electric propulsion system for a multi-functional research vessel according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the power supply path of an electric propulsion system according to an embodiment of the present invention under normal navigation conditions; Figure 3 This is a schematic diagram of the power supply path of an electric propulsion system under ice-breaking conditions according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the power supply path of an electric propulsion system according to an embodiment of the present invention under underwater operating conditions; Figure 5 This is a flowchart illustrating an embodiment of the electric propulsion method for a multi-functional research vessel according to the present invention.

[0019] Symbol marking explanation

[0020] 10-First power supply module, 20-Second power supply module, 30-Tie switch, 11-First bow thruster, 21-Second bow thruster, 101-First generator set, 102-Second generator set, 103-Third generator set, 104-Fourth generator set, 105-First AC distribution board, 106-Second AC distribution board, 107-First closing switch, 108-Second closing switch, 109-Third closing switch, 110-Fourth closing switch, 111-Fifth closing switch, 112-Sixth closing switch Switches: 113-Seventh closing switch, 114-Eighth closing switch, 115-Ninth closing switch, 116-First bow-side thruster soft starter cabinet, 117-Second bow-side thruster soft starter cabinet, 118-First phase-shifting transformer, 119-Second phase-shifting transformer, 120-First frequency converter, 121-Second frequency converter, 122-First bow-side thruster motor, 123-Second bow-side thruster motor, 124-First bow-side thruster propeller, 125-Second bow-side thruster propeller, 126-First podded thruster, 127-Second podded thruster. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description to provide a full understanding of the invention. However, the invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual applications without departing from the spirit of the invention. Therefore, the scope of protection of the invention should not be limited by the content of these specific embodiments. It should be noted that these and subsequent accompanying drawings are merely examples and are not drawn to scale, and should not be construed as limiting the actual scope of protection claimed by the invention.

[0022] In the description of this invention, terms such as "first," "second," and "third" are used only to distinguish different components and are not used to indicate the primary or secondary relationship between components or to limit the number of components. "Upstream" and "downstream" are defined according to the direction of electrical energy flow from the AC distribution board to the thruster, with the side closer to the AC distribution board being upstream and the side closer to the thruster being downstream.

[0023] The term "bow thruster" refers to a propeller installed in the transverse tunnel at the bow of a ship, which generates transverse thrust by discharging water to achieve lateral movement or rotation in place.

[0024] The term "podded propulsion" refers to a rotary propulsion device that can rotate 360° horizontally, generating forward and backward propulsion as well as changing direction.

[0025] Figure 1An electric propulsion system for a multi-functional research vessel is provided. The electric propulsion system includes a first power supply module 10, a second power supply module 20, and a connecting switch 30 disposed between the first power supply module 10 and the second power supply module 20. Figure 1 In this embodiment, the third closing switch 109 is the connecting switch 30.

[0026] The first power supply module 10 includes at least two generator sets, a first AC distribution board 105, and switches corresponding to each generator set. Each generator set is connected in parallel to the first AC distribution board 105 via a corresponding switch. The first AC distribution board 105 is connected to the first pod thruster 126 and the first bow thruster 11, respectively. Figure 1 In the embodiment shown, the first bow thruster 11 includes a first bow thrust motor 122 and a first bow thrust propeller 124.

[0027] The second power supply module 20 includes at least two generator sets, a second AC distribution board 106, and switches corresponding to each generator set. Each generator set is connected in parallel to the second AC distribution board 106 via a corresponding switch. The second AC distribution board 106 is connected to the second pod thruster 127 and the second bow thruster 21, respectively. Figure 1 In the embodiment shown, the second bow thruster 21 includes a second bow thrust motor 123 and a second bow thrust propeller 125.

[0028] The first podded thruster 124 and the second podded thruster 125 can be respectively disposed on both sides of the hull, for example, on the port side and the starboard side respectively. The first bow thruster 11 and the second bow thruster 21 can also be disposed at intervals along the width of the hull to provide lateral thrust when the ship is running at low speed. It should be understood that the first and second thrusters are not limited to a specific port or starboard correspondence.

[0029] The first power supply module 10 and the second power supply module 20 each constitute a relatively independent power supply zone. A tie switch 30 is disposed between the first power supply module 10 and the second power supply module 20. The tie switch 30 can selectively turn on or off according to the operating conditions to realize the electrical connection or disconnection of the first AC distribution board 105 and the second AC distribution board 106.

[0030] For example, when the third closing switch 109 is open, the first AC distribution board 105 and the second AC distribution board 106 are electrically isolated from each other. The first power supply module 10 and the second power supply module 20 supply power to their respective thrusters to ensure independence and reduce the impact of a power supply failure on the other side. When the third closing switch 109 is closed, the first AC distribution board 105 and the second AC distribution board 106 are interconnected. The first power supply module and the second power supply module are configured such that one of them supplies power to the other through a tie switch. For example, the first power supply module 10 can transfer power to the second power supply module 20, or the second power supply module 20 can transfer power to the first power supply module 10. Therefore, this structure can improve the fault isolation capability during zoned power supply and also improve the power supply flexibility and generator utilization rate during interconnected power supply.

[0031] The switches corresponding to each generator set, the switches corresponding to each propulsion branch, and the third closing switch 109 can be selectively closed or opened according to the operating conditions, thereby determining whether there is a power supply connection between the generator set in operation, the propeller in operation, the first AC distribution board 105, and the second AC distribution board 106.

[0032] Continue to refer to Figure 1 In the specific embodiment shown, the first power supply module 10 specifically includes a first main generator set 101, a second main generator set 102, a first closing switch 107, and a second closing switch 108.

[0033] The first main generator set 101 is connected to the first AC distribution board 105 via the first closing switch 107. The second main generator set 102 is connected to the first AC distribution board 105 via the second closing switch 108. The first closing switch 107 and the second closing switch 108 can be closed or opened independently of each other, thereby allowing the first main generator set 101 and the second main generator set 102 to be respectively connected to or disconnected from the first AC distribution board 105.

[0034] When the power demand of the first power supply module 10 is low, only one of the first main generator set 101 and the second main generator set 102 can be started. When the power demand increases, the first main generator set 101 and the second main generator set 102 can be started, and after the parallel connection conditions are met, the first closing switch 107 and the second closing switch 108 are closed, so that the two main generator sets supply power to the first AC distribution board 105 in parallel.

[0035] The second power supply module 20 specifically includes a third main generator set 103, a fourth main generator set 104, a fourth closing switch 110, and a fifth closing switch 111.

[0036] The third main generator set 103 is connected to the second AC distribution board 106 via the fourth closing switch 110. The fourth main generator set 104 is connected to the second AC distribution board 106 via the fifth closing switch 111. The fourth closing switch 110 and the fifth closing switch 111 can be closed or opened independently of each other, thereby allowing the third main generator set 103 and the fourth main generator set 104 to be respectively connected to or disconnected from the second AC distribution board 106.

[0037] When the power demand of the second power supply module 20 is low, only one of the third main generator set 103 and the fourth main generator set 104 needs to be started. When the power demand increases, both the third main generator set 103 and the fourth main generator set 104 can be started, and the two main generator sets can supply power to the second AC distribution board 106 in parallel.

[0038] By setting a corresponding closing switch for each main generator set, the power supply of each main generator set can be independently controlled to be put into or taken out of power supply.

[0039] Through the above configuration, the first main generator set 101, the second main generator set 102, the third main generator set 103, and the fourth main generator set 104 can all be independently put into or taken out of operation according to the operating conditions and propulsion power requirements. This allows the electric propulsion system 100 to form various generator set combinations, such as single-unit power supply, parallel power supply of two generators within the same power supply module, separate power supply from two power supply modules, and cross-regional power supply from one side of the power supply module. Therefore, the number of generator sets in operation can be flexibly matched with the actual propulsion power requirements.

[0040] Furthermore, the first power supply module 10 also includes a first phase-shifting transformer 120 and a first phase-shifting transformer 118 located upstream of the first pod thruster 126. The first bow thruster 11 also includes a first bow thruster soft starter cabinet 116.

[0041] The first AC distribution board 105 is connected to the input side of the first phase-shifting transformer 120 via the seventh closing switch 113. The output side of the first phase-shifting transformer 120 is connected to the first frequency converter 122, which is connected to the first pod thruster 124. When the seventh closing switch 113 is closed, the first AC distribution board 105 can supply power to the first frequency converter 122 through the first phase-shifting transformer 120. The first frequency converter 122 adjusts the electrical energy supplied to the first pod thruster 126 according to the power command corresponding to the current operating condition, thereby controlling the speed and output power of the first pod thruster 126. The first phase-shifting transformer 120 is used to perform voltage matching and phase shifting processing on the electrical energy output from the first AC distribution board 105 to meet the power supply requirements of the first frequency converter 122 and reduce the impact of harmonics generated by the first frequency converter 122 on the first AC distribution board 105.

[0042] The first AC power distribution board 105 is connected to the first bow thrust soft starter cabinet 116 via the sixth closing switch 112. The first bow thrust soft starter cabinet 116 is connected to the first bow thrust motor 122, and the first bow thrust motor 122 is driven by the first bow thrust propeller 124. After the sixth closing switch 112 is closed, the first AC power distribution board 105 supplies power to the first bow thrust soft starter cabinet 116. The first bow thrust soft starter cabinet 116 controls the first bow thrust motor 122 to start gradually, and the first bow thrust motor 122 drives the first bow thrust propeller 124 to rotate, so as to generate lateral thrust in the first direction or generate lateral thrust in the opposite direction by changing the direction of rotation.

[0043] Correspondingly, the second power supply module 20 also includes a second phase-shifting transformer 119 and a second frequency converter 121. The second bow thruster 21 includes a second bow thruster soft starter cabinet 117.

[0044] The second AC distribution board 106 is connected to the input side of the second phase-shifting transformer 119 via the eighth closing switch 114. The output side of the second phase-shifting transformer 119 is connected to the second frequency converter 121, and the second frequency converter 121 is connected to the second pod thruster 127. When the eighth closing switch 114 is closed, the second AC distribution board 106 can supply power to the second frequency converter 121 through the second phase-shifting transformer 119. The second frequency converter 121 controls the speed and output power of the second pod thruster 127 according to the power command corresponding to the current operating condition.

[0045] The second AC power distribution board 106 is connected to the second bow-side thrust soft starter cabinet 117 via the ninth closing switch 115. The second bow-side thrust soft starter cabinet 117 is connected to the second bow-side thrust motor 123, and the second bow-side thrust motor 123 is driven by the second bow-side thrust propeller 125. After the ninth closing switch 115 is closed, the second AC power distribution board 106 supplies power to the second bow-side thrust soft starter cabinet 117. The second bow-side thrust soft starter cabinet 117 controls the second bow-side thrust motor 123 to start gradually, and the second bow-side thrust motor 123 drives the second bow-side thrust propeller 125 to rotate.

[0046] The first bow thruster soft starter cabinet 116 and the second bow thruster soft starter cabinet 117 can reduce the inrush current when the first bow thruster motor 122 and the second bow thruster motor 123 are started, avoid significant voltage fluctuations on the AC power distribution board caused by the sudden start of the bow thruster, and reduce the mechanical impact on the bow thruster motor and the bow thruster propeller.

[0047] The first pod thruster 126 and the second pod thruster 127 can independently adjust their output power. In the zoned power supply mode, the two pod thrusters are powered by the first AC distribution board 105 and the second AC distribution board 106, respectively; in the interconnected power supply mode, the two pod thrusters can be powered by the generator set in the same power supply module.

[0048] The first phase-shifting transformer 118 and the second phase-shifting transformer 119 can provide suitable input voltage and phase relationship for the corresponding frequency converters, which helps to reduce the harmonic impact fed back to the AC power distribution system when the frequency converter is working and improve the power supply quality of the pod propulsion branch.

[0049] Based on the above introduction to electric propulsion systems, we can also understand an electric propulsion method.

[0050] like Figure 5 As shown in the figure, this embodiment also provides an electric propulsion control method for a multi-functional scientific research vessel. The method uses the above-mentioned electric propulsion system 100 and specifically includes the following steps.

[0051] First, proceed to step S101 to obtain the operating conditions and propulsion power requirements of the multi-functional research vessel.

[0052] Operating conditions may include at least one of the following: normal navigation conditions, port entry and exit conditions, icebreaking conditions, dynamic positioning heavy load conditions, dynamic positioning light load conditions, and underwater operation conditions.

[0053] Then, in step S102, based on the operating conditions and propulsion power requirements, the target generator set to be put into operation is determined from the generator sets of the first power supply module and the second power supply module, and the target propulsion unit to be put into operation is determined from the first pod propulsion unit, the second pod propulsion unit, the first bow thruster and the second bow thruster.

[0054] The target generator set can be selected from the first main generator set 101, the second main generator set 102, the third main generator set 103, and the fourth main generator set 104. The target thruster can be selected from the first pod thruster 124, the second pod thruster 125, the first bow thruster 11, and the second bow thruster 21.

[0055] Then proceed to step S103, which determines whether to adopt a zoned power supply mode or a tie power supply mode based on the operating conditions.

[0056] In the zoned power supply mode, the third closing switch 109 is kept open, and the first power supply module 10 supplies power to the target thruster connected to the first AC distribution board 105, and the second power supply module 20 supplies power to the target thruster connected to the second AC distribution board 106.

[0057] In the interconnected power supply mode, the third closing switch 109 is closed to connect the first AC distribution board 105 and the second AC distribution board 106, so that the target generator set put into operation in the first power supply module 10 or the second power supply module 20 can simultaneously supply power to the target thrusters in the two power supply modules.

[0058] Finally, in step S104, the target generator set is started, and the switch corresponding to the target generator set is closed to electrically connect the target generator set to the first AC distribution board and / or the second AC distribution board, and to electrically connect the target thruster to the first AC distribution board and / or the second AC distribution board, so that the target thruster can work.

[0059] When two main generator sets need to be connected to the same AC distribution board, after the output voltage, frequency, and phase of the later-starting main generator set meet the parallel connection conditions, its corresponding closing switch is closed to allow the two main generator sets to supply power in parallel. The closing switch corresponding to the branch where the target thruster is located is closed, and the target thruster outputs corresponding power according to the thrust power requirement.

[0060] For podded thrusters, the speed and output power of the podded thrusters are controlled by the corresponding frequency converters; for bow thrusters, the bow thrusters motors are started by the corresponding bow thruster soft starter cabinets, and the operating status of the bow thrusters is controlled according to the operation requirements.

[0061] The following is through Figures 2 to 4 The specific embodiments shown will be described in detail.

[0062] The first main generator set 101 and the second main generator set 102 are electrically connected to the first AC distribution board 105 via the first closing switch 107 and the second closing switch 108, respectively. The third main generator set 103 and the fourth main generator set 104 are electrically connected to the second AC distribution board 106 via the fourth closing switch 110 and the fifth closing switch 111, respectively. The first AC distribution board 105 and the second AC distribution board 106 are connected via the third closing switch 109. The first AC distribution board 105 is electrically connected to the first bow thrust soft starter cabinet 116 via the sixth closing switch 112. The first bow thrust soft starter cabinet 116 is electrically and signal connected to the first bow thrust motor 122. The first bow thrust motor 122 is electrically connected to the first bow thrust propeller 124. The first AC distribution board 105 is electrically connected to the first phase-shifting transformer 118 via the seventh closing switch 113. The first phase-shifting transformer 118 is electrically connected to the first frequency converter 120. The first frequency converter 120 is electrically and signal-connected to the first podded thruster 126. The second AC distribution board 106 is electrically connected to the second bow-side thruster soft starter cabinet 117 via the ninth closing switch 115. The second bow-side thruster soft starter cabinet 117 is electrically and signal-connected to the second bow-side thruster motor 123. The second bow-side thruster motor 123 is electrically connected to the second bow-side thruster propeller 125. The second AC distribution board 106 is electrically connected to the second phase-shifting transformer 119 via the eighth closing switch 114. The second phase-shifting transformer 119 is electrically connected to the second frequency converter 121. The second frequency converter 121 is electrically and signal-connected to the second podded thruster 127.

[0063] Normal navigation conditions

[0064] Electric propulsion system operates at Figure 2 During the normal navigation conditions shown, the electrical energy generated by the second main generator set 102 after startup enters the first AC distribution board 105 through the second closing switch 108. The first AC distribution board 105 supplies power to the first frequency converter 120 through the first phase-shifting transformer 118 via the seventh closing switch 113. The first frequency converter 120 controls the output power of the first pod thruster 126 according to the normal navigation power requirements.

[0065] The third main generator set 103 is started. The electrical energy generated by the third main generator set 103 after startup enters the second AC distribution board 106 via the fourth closing switch 110. The second AC distribution board supplies power to the second frequency converter 121 via the second phase-shifting transformer 119 through the eighth closing switch 114. The second frequency converter 121 controls the output power of the second pod thruster according to the normal navigation power requirements. Under normal navigation conditions, the sixth closing switch 112 and the ninth closing switch 115 remain open, keeping the first bow thruster 11 and the second bow thruster 21 out of operation. The two pod thrusters can be independently powered by their respective power supply modules, meeting the normal navigation propulsion power requirements while maintaining electrical isolation between the propulsion branches of the two pods.

[0066] Port entry and exit conditions

[0067] When the electric propulsion system is operating in port entry and exit conditions, the ship's speed is relatively low, and the bow thrusters are needed to improve the ship's lateral movement and turning ability.

[0068] The electrical energy generated by the first main generator set 101 after startup enters the first AC distribution board 105 via the first closing switch 107. The first AC distribution board 105 supplies power to the first bow thruster soft starter cabinet 116 via the sixth closing switch 112. The first bow thruster soft starter cabinet 116 controls the first bow thruster motor 122 to drive the first bow thruster propeller 124 to output power according to the power requirements of the ship's navigation in and out of port. The electrical energy generated by the fourth main generator set 104 after startup enters the second AC distribution board 106 via the fifth closing switch 111. The second AC distribution board 106 supplies power to the second bow thruster soft starter cabinet 117 via the ninth closing switch 115. The second bow thruster soft starter cabinet 117 controls the second bow thruster motor 123 to drive the second bow thruster propeller 125 to output power according to the power requirements of the ship's navigation in and out of port.

[0069] By controlling the two bow thrusters and the two pod thrusters separately, combined forces and torques of different directions and magnitudes can be generated, improving the maneuverability of the multi-functional research vessel at low speeds in the port area.

[0070] Icebreaking conditions

[0071] The electric propulsion system operates under icebreaking conditions. The electric propulsion system 100 employs a zoned power supply mode, and the third closing switch 109 remains open. Under icebreaking conditions, the ship requires significant propulsion power.

[0072] like Figure 3 As shown, the electrical energy generated by the first main generator set 101 and the second main generator set 102 after startup enters the first AC distribution board 105 via the first closing switch 107 and the second closing switch 108. The first AC distribution board 105 supplies power to the first frequency converter 120 through the first phase-shifting transformer 118 via the seventh closing switch 113. The first frequency converter 120 controls the output power of the first podded thruster 126 according to the power requirements of the ship's icebreaking navigation. The first AC distribution board 105 supplies power to the first bow thruster soft starter cabinet 116 via the sixth closing switch 112. The first bow thruster soft starter cabinet 116 controls the first bow thruster motor 122 to drive the first bow thruster propeller 124 to output power according to the power requirements of the ship's icebreaking navigation. The electrical energy generated by the third main generator set 103 and the fourth main generator set 104 after startup enters the second AC distribution board 106 through the fourth closing switch 110 and the fifth closing switch 111. The second AC distribution board 106 supplies power to the second frequency converter 121 through the second phase-shifting transformer 119 via the eighth closing switch 114. The second frequency converter 121 controls the output power of the second pod thruster 127 according to the power requirements of the ship's icebreaking navigation. The second AC distribution board 106 supplies power to the second bow thruster soft starter cabinet 117 through the ninth closing switch 115. The second bow thruster soft starter cabinet 117 controls the second bow thruster motor 123 to drive the second bow thruster propeller 125 to output power according to the power requirements of the ship's icebreaking navigation.

[0073] Under these conditions, multiple generator sets in each power supply module can operate in parallel and simultaneously supply power to the pod thruster and bow thruster to meet the requirements for high propulsion power and multi-directional thrust.

[0074] Dynamic positioning heavy-duty working conditions

[0075] Under dynamic positioning heavy load conditions, the control logic can be basically the same as that under icebreaking conditions, both of which require a large propulsion power.

[0076] Continue to refer to Figure 3As shown, the electrical energy generated by the first main generator set 101 and the second main generator set 102 after startup enters the first AC distribution board 105 through the first closing switch 107 and the second closing switch 108. The first AC distribution board 105 supplies power to the first frequency converter 120 through the first phase-shifting transformer 118 via the seventh closing switch 113. The first frequency converter 120 controls the output power of the first pod thruster 126 according to the power requirements of the ship's dynamic positioning heavy load operation. The first AC distribution board 105 supplies power to the first bow thruster soft starter cabinet 116 through the sixth closing switch 112. The first bow thruster soft starter cabinet 116 controls the first bow thruster motor 122 to drive the first bow thruster propeller 124 to output power according to the power requirements of the ship's dynamic positioning heavy load operation. The electrical energy generated by the third main generator set 103 and the fourth main generator set 104 after startup enters the second AC distribution board 106 through the fourth closing switch 110 and the fifth closing switch 111. The second AC distribution board 106 supplies power to the second frequency converter 121 through the second phase-shifting transformer 119 via the eighth closing switch 114. The second frequency converter 121 controls the output power of the second pod thruster 127 according to the power requirements of the ship's dynamic positioning heavy load conditions. The second AC distribution board 106 supplies power to the second bow thruster soft starter cabinet 117 through the ninth closing switch 115. The second bow thruster soft starter cabinet 117 controls the second bow thruster motor 123 to drive the second bow thruster propeller 125 to output power according to the power requirements of the ship's dynamic positioning heavy load conditions.

[0077] The two power supply modules are powered by dual-machine parallel power supply, which can meet the high and continuously changing propulsion power requirements under heavy-load conditions of dynamic positioning, and achieve fault isolation of the two power supply modules by keeping the third closing switch 109 open.

[0078] Dynamic positioning for light-load conditions

[0079] In one embodiment of this application, the electric propulsion system operates under dynamic positioning light load conditions. The electric propulsion system adopts a zoned power supply mode, but the number of main generator sets put into operation in the first power supply module 10 and the second power supply module 20 can be reduced respectively.

[0080] After the first main generator set 101 starts, the electrical energy generated enters the first AC distribution board 105 through the first closing switch 107. The first AC distribution board 105 supplies power to the first frequency converter 120 through the first phase-shifting transformer 118 via the seventh closing switch 113. The first frequency converter 120 controls the output power of the first pod thruster 126 according to the power requirements of the ship's dynamic positioning light load condition. The first AC distribution board 105 supplies power to the first bow thruster soft starter cabinet 116 through the sixth closing switch 112. The first bow thruster soft starter cabinet 116 controls the first bow thruster motor 122 to drive the first bow thruster propeller 124 to output power according to the power requirements of the ship's dynamic positioning light load condition.

[0081] The electrical energy generated by the third main generator set 103 after startup enters the second AC distribution board 106 through the fourth closing switch 110. The second AC distribution board 106 supplies power to the second frequency converter 121 through the second phase-shifting transformer 119 via the eighth closing switch 114. The second frequency converter 121 controls the output power of the second pod thruster 127 according to the power requirements of the ship's dynamic positioning light load condition. The second AC distribution board 106 supplies power to the second bow thruster soft starter cabinet 117 through the ninth closing switch 115. The second bow thruster soft starter cabinet 117 controls the second bow thruster motor 123 to drive the second bow thruster propeller 125 to output power according to the power requirements of the ship's dynamic positioning light load condition.

[0082] While meeting the requirements for coordinated operation of four thrusters under light-load dynamic positioning conditions, the number of main generator sets put into operation is reduced, which can save energy while meeting the power requirements of the operating conditions.

[0083] Underwater operation conditions

[0084] In underwater operations, vessels typically need to maintain low speeds, stable positions, or move slowly in conjunction with underwater equipment. Both the first podded thruster 126 and the second podded thruster 127 need to operate, but their respective power requirements are relatively low. A combined power supply mode can be used, allowing either the first power supply module or the second power supply module's generator set to simultaneously supply power to both the first and second AC distribution boards.

[0085] Reference Figure 4 As shown, the electrical energy generated by the second main generator set 102 after startup enters the first AC distribution board 105 through the second closing switch 108. The first AC distribution board 105 supplies power to the first frequency converter 120 through the first phase-shifting transformer 118 via the seventh closing switch 113. The first frequency converter 120 controls the output power of the first pod thruster 126 according to the power requirements of the underwater operation.

[0086] The first AC distribution board 105 supplies power to the second AC distribution board 106 via the third closing switch 109. The second AC distribution board 106 supplies power to the second frequency converter 121 via the second phase-shifting transformer 119 through the eighth closing switch 114. The second frequency converter 121 controls the output power of the second pod thruster 127 according to the power requirements of the underwater operation.

[0087] Through the above control, the first pod thruster 124 and the second pod thruster 125 on both sides can be driven simultaneously using only the second main generator set 102, without the need to start the third main generator set 103 separately for the second pod thruster 125, thereby increasing the load rate of the second main generator set 102 and reducing the number of main generator sets in operation.

[0088] It should be understood that, for underwater operations, the third main generator set 103 or the fourth main generator set 104 in the second power supply module 20 can also be selected as the target generator set. In this case, the second AC distribution board 106 supplies power to the first AC distribution board 105 through the third closing switch 109, and the target generator set in the second power supply module 20 simultaneously supplies power to the first pod thruster 124 and the second pod thruster 125.

[0089] In addition, after completing the configuration of the generator set capacity and the thruster configuration of the electric propulsion system, the propulsion power that the electric propulsion system can provide can be verified for various operating conditions of the multi-functional research vessel.

[0090] First, determine the required power of each propulsion unit under normal navigation conditions, port entry and exit conditions, icebreaking conditions, dynamic positioning heavy load conditions, dynamic positioning light load conditions, and underwater operation conditions.

[0091] Secondly, based on the main generator set commissioning combination, power supply mode, and power supply path corresponding to each operating condition, the total effective power that the main generator set in operation can provide to the propulsion equipment is calculated.

[0092] Subsequently, the propulsion power that the electric propulsion system can provide under each operating condition is compared with the propulsion power required for that operating condition.

[0093] When the propulsion power provided by the electric propulsion system is not less than the propulsion power required under the corresponding operating conditions and meets the preset power margin requirements, it can be determined that the current main generator set capacity configuration and propeller configuration meet the propulsion requirements of the operating conditions.

[0094] By verifying the power of each operating condition, it is possible to check whether the electric propulsion system meets the propulsion requirements of the multi-functional research vessel under all operating conditions. Based on the verification results, the rated power of the main generator set, the main generator set operation combination, or the propeller power distribution strategy can be adjusted.

[0095] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. An electric propulsion system for a multi-functional research vessel, characterized in that, include: The first power supply module includes at least two generator sets, a first AC distribution board, and switches corresponding to each of the generator sets. Each of the generator sets is connected in parallel to the first AC distribution board through the corresponding switches. The first AC distribution board is connected to the first pod thruster and the first bow thruster. The second power supply module includes at least two generator sets, a second AC distribution board, and switches corresponding to each generator set. Each generator set is connected in parallel to the second AC distribution board through its corresponding switch. The second AC distribution board is connected to the second pod thruster and the second bow thruster. as well as A communication switch is located between the first power supply module and the second power supply module; Each of the switches and the communication switches can be selectively turned on or off according to the operating conditions, so as to select at least one of the generator sets in the first power supply module and / or the second power supply module to be put into operation, and to enable the generator set in operation to supply power to the pod thruster and / or bow thruster of its corresponding power supply module.

2. The electric propulsion system as described in claim 1, characterized in that, The first power supply module and the second power supply module are configured such that one of them supplies power to the other through the interconnection switch.

3. The electric propulsion system as described in claim 1, characterized in that, The first power supply module includes a first main generator set, a second main generator set, a first closing switch, and a second closing switch. The first main generator set is connected to the first AC distribution board through the first closing switch, and the second main generator set is connected to the first AC distribution board through the second closing switch. The second power supply module includes a third main generator set, a fourth main generator set, a fourth closing switch, and a fifth closing switch. The third main generator set is connected to the second AC distribution board through the fourth closing switch, and the fourth main generator set is connected to the second AC distribution board through the fifth closing switch.

4. The electric propulsion system as described in claim 1, characterized in that, The first power supply module also includes a first bow thruster soft starter cabinet located upstream of the first bow thruster. The first AC power distribution board is connected to the first bow thruster soft starter cabinet via a switch to selectively supply power to the first bow thruster. The second power supply module also includes a second bow thruster soft starter cabinet located upstream of the second bow thruster. The second AC power distribution board is connected to the second bow thruster soft starter cabinet via a switch to selectively supply power to the second bow thruster.

5. The electric propulsion system as described in claim 1, characterized in that, The first power supply module also includes a first phase-shifting transformer disposed upstream of the first pod thruster. The first AC distribution board is connected to the first phase-shifting transformer via a switch to selectively supply power to the first pod thruster. The second power supply module also includes a second phase-shifting transformer located upstream of the second pod thruster. The second AC distribution board is connected to the second phase-shifting transformer via a switch to selectively supply power to the second pod thruster.

6. A method for controlling electric propulsion on a multi-functional research vessel, characterized in that, The method, employing an electric propulsion system as described in any one of claims 1 to 5, comprises: Obtain the operational status of the multi-functional research vessel; Based on the operating conditions, the propulsion power requirement is determined, and the target generator set to be put into operation is determined from the generator sets of the first power supply module and / or the second power supply module, and the target propulsion unit to be put into operation is determined from the first pod propulsion unit, the second pod propulsion unit, the first bow thruster and the second bow thruster. Start the target generator set and close the switch corresponding to the target generator set to electrically connect the target generator set to the first AC distribution board and / or the second AC distribution board, so that the first AC distribution board and / or the second AC distribution board supply power to the target thruster, thereby enabling the target thruster to operate.

7. The electric propulsion control method as described in claim 6, characterized in that, The method further includes the following steps: selecting either a zoned power supply mode or a tie-line power supply mode based on the operating conditions. In the partitioned power supply mode, the interconnection switch is disconnected, so that the target generator set in the first power supply module supplies power to the target thruster connected to the first AC distribution board, and / or so that the target generator set in the second power supply module supplies power to the target thruster connected to the second AC distribution board. In the interconnected power supply mode, closing the interconnection switch connects the first AC distribution board and the second AC distribution board, allowing either the first power supply module or the second power supply module to simultaneously supply power to both the first AC distribution board and the second AC distribution board.

8. The electric propulsion control method as described in claim 6, characterized in that, Under normal navigation conditions, the electric propulsion control method includes: To put at least one generator set in the first power supply module into operation and to supply power to the first pod thruster through the first AC distribution board; and To put at least one generator set in the second power supply module into operation and to supply power to the second pod thruster through the second AC distribution board; and Keep the communication switch off.

9. The electric propulsion control method as described in claim 6, characterized in that, In icebreaking or dynamic positioning heavy-load conditions, the electric propulsion control method includes: The first power supply module selects at least two generator sets to operate, and enables them to supply power to the first bow thruster and the first pod thruster through the first AC distribution board. The second power supply module selects at least two generator sets to operate, and enables them to supply power to the second bow thruster and the second pod thruster via the second AC distribution board; and Keep the communication switch off.

10. The electric propulsion control method as described in claim 6, characterized in that, In port entry and exit operations, the electric propulsion control method includes: To put at least one generator set in the first power supply module into operation and to supply power to the first bow thruster through the first AC distribution board; and To put at least one generator set in the second power supply module into operation and to supply power to the second bow thruster through the second AC distribution board; and Keep the communication switch off.

11. The electric propulsion control method as described in claim 6, characterized in that, Under dynamic positioning and light load conditions, the electric propulsion control method includes: Select one generator set from the first power supply module and put it into operation, so that it simultaneously supplies power to the first bow thruster and the first pod thruster through the first AC distribution board. Select one generator set from the second power supply module and put it into operation, so that it simultaneously supplies power to the second bow thruster and the second pod thruster through the second AC distribution board; and Keep the communication switch off.

12. The electric propulsion control method as described in claim 6, characterized in that, Under underwater operating conditions, the electric propulsion control method includes: To put at least one generator set of the first power supply module or at least one generator set of the second power supply module into operation; Close the connection switch to connect the first AC distribution board and the second AC distribution board; This allows the generator set to simultaneously supply power to both the first pod thruster and the second pod thruster.

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