A ship net interaction system and method based on a low-voltage on-board inverter loop

Abstract

This invention discloses a ship-grid interaction system and method based on a low-voltage shipborne inverter circuit. The ship-grid interaction coordination module is located on the power grid side and connected to the interactive bidirectional interface device and the power grid control system, achieving interconnection and coordination between them. The shipborne interaction module is located on the shipborne control side, communicating with the shipborne EMS system and interconnecting with the interactive control module of the interactive bidirectional interface device, achieving bidirectional communication and information exchange. The shipborne interaction module and the ship-grid interaction coordination module optimize the charging and discharging timing of the electric ship based on the bidirectional communication data. This solution can be applied without modifying the ship's electrical equipment structure, improving the flexibility and adaptability of ship-grid interaction. By establishing a multi-objective time-division optimization coordination strategy based on ship operation, it takes into account both power grid requirements and ship requirements, achieving optimized ship-grid coordination.

Description

Technical Field

[0001] This invention belongs to the field of low-voltage interconnection between electric ships and power grids, specifically relating to a ship-grid interaction system and method based on a low-voltage shipborne inverter circuit. Background Technology

[0002] With the advancement of new power system construction and the gradual increase in the penetration rate of new energy sources, the power grid is shifting from a source-following-load dynamic to a source-load interactive model. Traditional ships primarily rely on fuel oil. When docked, shore power systems provide power from the shore to the ship's auxiliary electrical systems, but they cannot provide reverse power supply support and bidirectional coordination between the ship's electrical systems and the power grid. With the gradual emergence of electric tugboats and new energy ships, ships have become a flexible and controllable typical load during docking periods, possessing the technical feasibility to participate in grid regulation and obtain grid revenue.

[0003] However, there are still challenges in how electric tugboats and new energy ships can participate in grid coordination. Since most shipboard electrical equipment is not designed to provide reverse power, it does not have bidirectional coordination capabilities. Modifying shipboard equipment involves long processes and is difficult to test and verify. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a ship-grid interaction system and method based on a low-voltage shipborne inverter circuit. This system can be applied without altering the structure of the ship's electrical equipment, improving the flexibility and adaptability of ship-grid interaction. By establishing a multi-objective time-division optimization and coordination strategy based on ship operation, it takes into account both grid requirements and ship requirements, achieving optimized coordination between the ship and the grid.

[0005] The specific technical solution for achieving the objective of this invention is as follows:

[0006] A ship-to-grid interaction system based on a low-voltage shipborne inverter circuit includes a shipborne interaction module, an interactive bidirectional interface device, and a ship-to-grid interaction coordination module.

[0007] The ship-grid interaction and coordination module is located on the power grid side and is connected to the interactive two-way interface device and the power grid control system to realize interconnection and coordination between them.

[0008] The shipborne interactive module is installed on the shipborne control side, communicates with the shipborne EMS system, and is interconnected with the interactive control module of the interactive two-way interface device to realize two-way communication connection and information interaction.

[0009] The interactive two-way interface device includes a shipboard interface module, an AC / DC conversion module, a DC / AC conversion module, a power grid connection module, and an interactive control module.

[0010] The shipboard interface module is connected to the shipboard electrical system. The AC / DC conversion module and the DC / AC conversion module are used to rectify and invert the AC power supplied by the shipboard, so as to realize the flexible and controllable power supply of the ship. The power grid connection module is connected to the power grid electrical system.

[0011] Furthermore, the shipborne interaction module and the ship-to-network interaction and coordination module achieve bidirectional interactive communication through an interactive bidirectional interface device, including:

[0012] Basic parameters for timed interaction between the shipborne interaction module and the ship-to-network interaction and coordination module;

[0013] The shipborne interaction module actively exchanges real-time operating parameters with the ship-network interaction and coordination module;

[0014] Real-time exchange of interlocking data and interlocking responses between the shipborne interaction module and the ship-to-network interaction and coordination module;

[0015] The shipborne interaction module and the ship-to-network interaction and coordination module exchange timed plan declaration and response data;

[0016] The ship-to-network interaction and coordination module sends planned adjustment data and real-time adjustment data to the shipboard interaction module.

[0017] Furthermore, the basic parameters include the rated power and rated capacity of the electric boat power supply;

[0018] The real-time operating parameters are the real-time electrical operating data of the electric boat, including active power, reactive power, SOC, three-phase voltage, three-phase current, SOH, and power factor.

[0019] The interlocking data includes the interlocking mode, interlocking reason, and interlocking information;

[0020] The planned declaration includes potential declaration, regulating capacity declaration, and quantity-price declaration. The declaration period includes day-ahead declaration and real-time declaration. Potential declaration includes day-ahead planned adjustable quantity and real-time adjustable quantity. Regulating capacity declaration is for the grid dispatch and peak-shaving market, and the adjustable capacity within the defined time period is reported day-ahead. Quantity-price declaration is for the electricity spot market, and is reported on a rolling basis day-ahead and intraday according to market prices.

[0021] Furthermore, the planned adjustment data includes planned time and power requirements;

[0022] The real-time adjustment data includes real-time power.

[0023] Furthermore, the shipborne interactive module and the ship-to-grid interactive coordination module achieve power exchange between the grid side and the ship-to-grid side through an interactive two-way interface device, i.e., the charging and discharging of the electric ship.

[0024] Furthermore, the shipboard interaction module and the ship-to-network interaction and coordination module optimize the charging and discharging timing of the electric ship based on data from two-way communication. The process includes:

[0025] Construct a multi-objective weighted synthesis function;

[0026] Acquire data and real-time status, and dynamically adjust the weights in the multi-objective weighted synthesis function;

[0027] A multi-objective solution method is used to solve and execute the solution.

[0028] Furthermore, the multi-objective weighted synthesis function is:

[0029]

[0030]

[0031]

[0032]

[0033] in , , These represent the economic benefits of energy storage charging and discharging, the economic benefits of active power support, and the economic benefits of reactive voltage support, respectively. , , These represent the weighting coefficients;

[0034] T represents the total number of time intervals in the optimization time domain. This represents the electricity price during time period t. express, express, express, express, Indicates the duration of a single time period; This represents the actual net active power dispatched. This indicates the active power reference command issued by the power grid; Indicates time period The actual voltage at the grid connection point, This indicates the rated voltage, which is the target voltage.

[0035] Furthermore, the strategy for dynamically adjusting the weights is as follows:

[0036]

[0037] in It is a state-sensitive function. , ; The dynamic weight of the i-th control objective at time t is used to allocate the priority of each objective in multi-objective optimization. Let t be the actual load. This is the load threshold; the function only takes effect when the load exceeds the threshold.

[0038] Furthermore, when using a multi-objective solution method to solve the multi-objective weighted synthesis function, constraints are set, including:

[0039] Power limits: Where P is active power and Q is reactive power. Apparent power;

[0040] Voltage safety: ; , The voltage limit is set;

[0041] Operational support: Before departure SOC stands for State of Charge of the energy storage, and SOCreq is the reference limit value for SOC.

[0042] This solution also provides a ship-to-grid interaction method based on a low-voltage shipborne inverter circuit, including the following steps:

[0043] Step 1: Construct an electric ship-grid collaborative interaction system architecture, including a shipboard interaction module, a bidirectional interaction interface device, and a ship-grid interaction collaboration module;

[0044] The ship-grid interaction and coordination module is located on the power grid side and is connected to the interactive two-way interface device and the power grid control system to realize interconnection and coordination between them.

[0045] The shipborne interactive module is installed on the shipborne control side, communicates with the shipborne EMS system, and is interconnected with the interactive control module of the interactive two-way interface device to realize two-way communication connection and information interaction.

[0046] The interactive two-way interface device includes a shipboard interface module, an AC / DC conversion module, a DC / AC conversion module, a power grid connection module, and an interactive control module.

[0047] The shipboard interface module is connected to the shipboard electrical system, the AC / DC conversion module and the DC / AC conversion module are used to rectify and invert the AC power supplied by the shipboard, so as to realize the flexible control of the shipboard power supply, and the power grid connection module is connected to the power grid electrical system.

[0048] Step 2: Based on the electric ship-grid collaborative interaction system architecture, construct a two-way communication strategy;

[0049] Step 3: Based on the electric ship-grid collaborative interaction system architecture and its two-way communication strategy, realize ship-grid collaborative interaction applications and optimize the charging and discharging timing of electric ships, including:

[0050] Construct a multi-objective weighted synthesis function;

[0051] Acquire data and real-time status, and dynamically adjust the weights in the multi-objective weighted synthesis function;

[0052] A multi-objective solution method is used to solve and execute the solution.

[0053] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0054] (1) This scheme provides a new approach for electric ships to participate in grid interaction, avoiding the modification of existing shipboard electrical equipment, building an interactive two-way interface device integrating AC / DC conversion and communication on shore, and adopting a multi-objective time-sharing optimization strategy to adapt to the ship's operating rules while achieving coordination with the grid.

[0055] (2) The electric ship-grid collaborative interaction system architecture of this scheme realizes the rectification and inversion of the ship's AC power supply through AC / DC and DC / AC AC-DC-AC conversion modules, so as to realize the flexible control of the ship's power supply and make full use of the existing low-voltage inverter circuit on the ship, without the need to modify the ship's equipment.

[0056] (3) When the ship interacts with the grid, this scheme designs a multi-objective time-sharing optimization strategy to adapt to the ship's operating rules and achieve coordination with the power grid. This method fully considers the basic operating rules of the ship and achieves coordination with production based on an adaptive weight strategy.

[0057] The present invention will be further described below with reference to specific embodiments. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the electric boat-electric grid collaborative interaction system architecture of the present invention.

[0059] Figure 2 This is a schematic diagram of uplink data communication between the shipborne interaction module and the ship-to-network interaction and coordination module in an embodiment of the present invention.

[0060] Figure 3 This is a schematic diagram of downlink data communication between the shipborne interaction module and the ship-to-network interaction and coordination module in an embodiment of the present invention.

[0061] Figure 4 This is a schematic diagram of the charging and discharging timing optimization process of the present invention. Detailed Implementation

[0062] Example

[0063] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0064] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0065] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0066] Combination Figure 1 A ship-to-grid interaction system based on a low-voltage shipborne inverter circuit includes a shipborne interaction module, an interactive bidirectional interface device, and a ship-to-grid interaction coordination module.

[0067] The ship-grid interaction and coordination module is located on the power grid side and is connected to the interactive two-way interface device and the power grid control system to realize interconnection and coordination between them. Its functions generally include ship-side data acquisition, power connection characteristic analysis, potential assessment, and coordinated control.

[0068] The shipborne interactive module is installed on the shipborne control side, communicates with the shipborne EMS system, and is interconnected with the interactive control module of the interactive two-way interface device to realize two-way communication connection and information interaction.

[0069] The interactive two-way interface device includes a shipboard interface module, an AC / DC conversion module, a DC / AC conversion module, a power grid connection module, and an interactive control module.

[0070] The shipboard interface module is connected to the shipboard electrical system. The AC / DC conversion module and the DC / AC conversion module are used to rectify and invert the AC power supplied by the shipboard, respectively, so as to realize the flexible and controllable power supply of the shipboard power supply and make full use of the existing low-voltage inverter circuit on the shipboard without the need to modify the shipboard equipment. The power grid connection module is connected to the power grid electrical system.

[0071] The shipborne interaction module and the ship-to-network interaction and coordination module achieve bidirectional interactive communication through an interactive bidirectional interface device. This communication strategy adopts the basic MQTT framework, including:

[0072] Uplink data interaction, such as Figure 2 As shown:

[0073] The basic parameters for the timed exchange between the shipboard interaction module and the ship-to-network interaction and coordination module include the rated power and rated capacity of the electric ship's power supply. Generally, a timed exchange mode of once a day is adopted.

[0074] The shipborne interaction module actively exchanges real-time operating parameters with the ship-network interaction and coordination module, including active power, reactive power, SOC, three-phase voltage, three-phase current, SOH, and power factor, using a real-time upload mode.

[0075] The shipboard interaction module and the ship-to-network interaction and coordination module exchange interlocking data and interlocking responses in real time. The interlocking data includes the interlocking mode (active / abnormal), the interlocking reason, and the interlocking information.

[0076] The shipborne interaction module and the ship-to-network interaction and coordination module exchange timed plan declaration and response data;

[0077] The planned declaration includes potential declaration, regulating capacity declaration, and quantity-price declaration. The declaration period includes day-ahead declaration and real-time declaration. Potential declaration includes day-ahead planned adjustable quantity and real-time adjustable quantity. Regulating capacity declaration is for the grid dispatch and peak-shaving market, and the adjustable capacity within the defined time period is reported day-ahead. Quantity-price declaration is for the electricity spot market, and is reported on a rolling basis day-ahead and intraday according to market prices.

[0078] Downlink data interaction, such as Figure 3 As shown:

[0079] The ship-to-network interaction and coordination module sends planned adjustment data and real-time adjustment data to the shipboard interaction module;

[0080] The planned adjustment data includes planned time and power requirements;

[0081] The real-time adjustment data includes real-time power.

[0082] The shipboard interactive module and the ship-to-grid interactive coordination module achieve power exchange between the grid side and the ship-to-grid side through an interactive two-way interface device, that is, through the charging and discharging of the electric ship.

[0083] However, due to the limited reverse power supply capability of the ship-grid interaction system based on the low-voltage shipborne inverter circuit, and considering the operating mode that supports grid operation, the shipborne interaction module and the ship-grid interaction coordination module optimize the charging and discharging timing of the electric ship based on bidirectional communication data. Figure 4 As shown, the process includes:

[0084] A multi-objective weighted comprehensive function is constructed to optimize economic benefits and support for grid power and voltage.

[0085]

[0086]

[0087]

[0088]

[0089] in , , These represent the economic benefits of energy storage charging and discharging, the economic benefits of active power support, and the economic benefits of reactive voltage support, respectively. , , These represent the weighting coefficients;

[0090] T represents the total number of time intervals in the optimization time domain. This represents the electricity price during time period t. express, express, express, express, Indicates the duration of a single time period; This represents the actual net active power dispatched. This indicates the active power reference command issued by the power grid; Indicates time period The actual voltage at the grid connection point, This indicates the rated voltage, which is the target voltage.

[0091] The specific meanings, units, and descriptions of each parameter are shown in the table below:

[0092]

[0093]

[0094]

[0095] Based on the acquired data and real-time status, the weights in the multi-objective weighted synthesis function are dynamically adjusted;

[0096] The adaptive weighting strategy in this embodiment is as follows:

[0097] Increase during periods of high electricity prices; increase during periods of heavy grid load / low frequency. When the voltage exceeds the limit, increase... :

[0098]

[0099] in State sensitivity function, load deviation sensitivity function Voltage deviation sensitivity function , The dynamic weight of the i-th control objective at time t is used to allocate the priority of each objective in multi-objective optimization. Let t be the actual load. This is the load threshold; the function only takes effect when the load exceeds the threshold.

[0100] Then, a multi-objective solution method is used to solve and execute the solution: Decision variables: , , ;

[0101] Objective function: ;

[0102] The constraints include:

[0103] Power limits: Where P is active power and Q is reactive power. Apparent power;

[0104] Voltage safety: ; , The voltage limit is set;

[0105] Operational support: Before departure SOC stands for State of Charge of the energy storage, and SOCreq is the reference limit value for SOC.

[0106] This embodiment describes the above optimization process in detail with specific examples:

[0107] Example scenario: During the period from 14:00 to 17:00, the photovoltaic output of the port power distribution network suddenly dropped while the load remained unchanged, resulting in a drop in node voltage.

[0108] Electric boat status:

[0109] Battery capacity: 1000 kWh

[0110] Current SOC (14:00): 80% → Remaining battery capacity: 800 kWh

[0111] Minimum safe SOC: 50% (must be ≥50% before departure)

[0112] Maximum charging / discharging power: ±300 kW (active power)

[0113] PCS rated apparent power: 350 kVA (supports four-quadrant operation)

[0114] Battery charge / discharge efficiency: η_ch = η_dis = 95%

[0115] Grid connection point voltage reference: 1.0 pu, allowable range [0.95, 1.05] pu

[0116] Current measured voltage (14:00): 0.93 pu (below the lower limit)

[0117] Electricity price data (14:00–17:00) is shown in the table below:

[0118] t=1 14:00–15:00 1.20 1200 200 0.93 t=2 15:00–16:00 1.10 1150 180 0.94 t=3 16:00–17:00 0.90 1000 150 0.96

[0119] Decision variables (per time period t):

[0120] Net active power (>0 indicates discharging, <0 indicates charging), unit kW

[0121] Reactive power (>0 inductive, boost voltage), unit kvar

[0122] Constraints:

[0123] Battery SOC dynamics:

[0124]

[0125] initial value ,Require

[0126] Power limits (apparent power constraints):

[0127]

[0128] Voltage constraint (linearized model):

[0129]

[0130] (Empirical sensitivity: For every 100kvar injected, the voltage increases by approximately 0.02pu)

[0131] Active bandwidth limit:

[0132] Objective function (comprehensive weighted):

[0133] Adaptive weights (based on initial state judgment):

[0134] because ,set up (Voltage priority)

[0135] High electricity prices,

[0136] Active support auxiliary, set

[0137] Normalized objective function (maximization):

[0138]

[0139] For simplicity, we directly construct a linearly weighted objective here:

[0140]

[0141] in ,and From the table above

[0142] Then, we analyze the process of maximizing the overall benefit while satisfying the constraints in each time period.

[0143] At t=1, the voltage is the lowest (0.93), so reactive power should be injected first.

[0144] High electricity prices make it suitable for discharging electricity, but excessive discharging should be avoided as it could compromise subsequent safety.

[0145] Apparent power-limited coupling P and Q.

[0146] (1) Determine the optimal (P1, Q1) at t=1.

[0147] Base voltage: 0.93 pu

[0148] Require: achievable kvar;

[0149] set up kvar (minimum satisfied)

[0150] The remaining apparent capacity is then used for active power:

[0151]

[0152] because

[0153] Economic considerations: Due to the high electricity price (1.2), electricity should be discharged as much as possible; therefore, the following is taken: kW

[0154] SOC verification:

[0155] Discharge of 300 kW × 1 h / 0.95 ≈ 315.8 kWh

[0156] New SOC: 800 - 315.8 = 484.2 kWh, does not meet the constraint.

[0157] The discharge amount must be limited to ensure that the final SOC ≥ 500.

[0158] Total available discharge capacity = 800 - 500 = 300 kWh (net energy)

[0159] Considering efficiency, the maximum dischargeable energy (output) = 300 × 0.95 = 285 kWh

[0160] Therefore, the total discharge energy in three hours is ≤ 285 kWh.

[0161] To leave room for maneuver, the allocation is as follows:

[0162] t=1: 150 kWh output → kW

[0163] t=2: 100 kWh → kW

[0164] t=3: 35 kWh → kW

[0165] (Total output = 285 kWh)

[0166] Now re-optimize t=1:

[0167] set up kW

[0168] To increase the voltage, it is still necessary kvar

[0169] Check apparent power: = = ≈ 180 kVA < 350 kVA, meets the requirements.

[0170] It can be further increased To increase the voltage (since there is no additional energy consumption), let... = 150 kvar

[0171] but = 0.93 + 0.0002×150 = 0.96pu

[0172] (2) t=2

[0173] Base voltage: 0.94 pu

[0174] Current battery level: 800 - 150 / 0.95 ≈ 800 - 157.9 = 642.1 kWh

[0175] The planned discharge is 100 kWh, which yields...

[0176] Voltage requirements: Therefore, it is necessary ≥ (0.95 - 0.94) / 0.0002 = 50kvar

[0177] Pick = 80 kvar (moderate increase)

[0178] get → OK

[0179]

[0180] (3)

[0181] Base voltage: 0.96 pu (meets standard)

[0182] No reactive power support is needed, i.e., Q3 = 0

[0183] Discharge 35 kW (low electricity price, less discharge)

[0184] S = 35 kVA, which meets the requirements.

[0185] Final energy consumption: 536.8 - 35 / 0.95 ≈ 500 kWh (just meets the target)

[0186]

[0187] Final output result:

[0188] t=0 14:00 — — — 0.93 800 — t=1 14:00–15:00 +150 +150 212 0.96 642.1 150 × 1.2 = 180 t=2 15:00–16:00 +100 +80 128 0.956 536.8 100 × 1.1 = 110 t=3 16:00–17:00 +35 0 35 0.96 500.0 35 × 0.9 = 31.5 Total — 285 kWh output — — — — 321.5 yuan

[0189] This solution provides a new approach for electric ships to participate in grid interaction, avoiding the need to modify existing shipboard electrical equipment. It constructs an interactive two-way interface device integrating AC / DC conversion and communication on shore, and adopts a multi-objective time-sharing optimization strategy to adapt to the ship's operating rules while achieving coordination with the power grid.

[0190] In addition, this solution also provides a ship-to-grid interaction method based on a low-voltage shipborne inverter circuit, including the following steps:

[0191] Step 1: Construct an electric ship-grid collaborative interaction system architecture, including a shipboard interaction module, a bidirectional interaction interface device, and a ship-grid interaction collaboration module;

[0192] The ship-grid interaction and coordination module is located on the power grid side and is connected to the interactive two-way interface device and the power grid control system to realize interconnection and coordination between them.

[0193] The shipborne interactive module is installed on the shipborne control side, communicates with the shipborne EMS system, and is interconnected with the interactive control module of the interactive two-way interface device to realize two-way communication connection and information interaction.

[0194] The interactive two-way interface device includes a shipboard interface module, an AC / DC conversion module, a DC / AC conversion module, a power grid connection module, and an interactive control module.

[0195] The shipboard interface module is connected to the shipboard electrical system, the AC / DC conversion module and the DC / AC conversion module are used to rectify and invert the AC power supplied by the shipboard, so as to realize the flexible control of the shipboard power supply, and the power grid connection module is connected to the power grid electrical system.

[0196] Step 2: Based on the electric ship-grid collaborative interaction system architecture, construct a two-way communication strategy;

[0197] Basic parameters for timed interaction between the shipborne interaction module and the ship-to-network interaction and coordination module;

[0198] The shipborne interaction module actively exchanges real-time operating parameters with the ship-network interaction and coordination module;

[0199] Real-time exchange of interlocking data and interlocking responses between the shipborne interaction module and the ship-to-network interaction and coordination module;

[0200] The shipborne interaction module and the ship-to-network interaction and coordination module exchange timed plan declaration and response data;

[0201] The ship-to-network interaction and coordination module sends planned adjustment data and real-time adjustment data to the shipboard interaction module.

[0202] Step 3: Based on the electric ship-grid collaborative interaction system architecture and its two-way communication strategy, realize ship-grid collaborative interaction applications and optimize the charging and discharging timing of electric ships, including:

[0203] Construct a multi-objective weighted synthesis function;

[0204] Acquire data and real-time status, and dynamically adjust the weights in the multi-objective weighted synthesis function;

[0205] A multi-objective solution method is used to solve and execute the solution.

[0206] The embodiments described above are merely one implementation method of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A ship-to-grid interaction system based on a low-voltage shipborne inverter circuit, characterized in that, Includes shipborne interaction module, interactive two-way interface device, and ship-to-network interaction and collaboration module; The ship-grid interaction and coordination module is located on the power grid side and is connected to the interactive two-way interface device and the power grid control system to realize interconnection and coordination between them. The shipborne interactive module is installed on the shipborne control side, communicates with the shipborne EMS system, and is interconnected with the interactive control module of the interactive two-way interface device to realize two-way communication connection and information interaction. The interactive two-way interface device includes a shipboard interface module, an AC / DC conversion module, a DC / AC conversion module, a power grid connection module, and an interactive control module. The shipboard interface module is connected to the shipboard electrical system. The AC / DC conversion module and the DC / AC conversion module are used to rectify and invert the AC power supplied by the shipboard, so as to realize the flexible and controllable power supply of the ship. The power grid connection module is connected to the power grid electrical system.

2. The ship-to-grid interaction system based on a low-voltage shipborne inverter circuit according to claim 1, characterized in that, The shipborne interaction module and the ship-to-network interaction and coordination module achieve bidirectional interactive communication through an interactive bidirectional interface device, including: Basic parameters for timed interaction between the shipborne interaction module and the ship-to-network interaction and coordination module; The shipborne interaction module actively exchanges real-time operating parameters with the ship-network interaction and coordination module; Real-time exchange of interlocking data and interlocking responses between the shipborne interaction module and the ship-to-network interaction and coordination module; The shipborne interaction module and the ship-to-network interaction and coordination module exchange timed plan declaration and response data; The ship-to-network interaction and coordination module sends planned adjustment data and real-time adjustment data to the shipboard interaction module.

3. The ship-to-grid interaction system based on a low-voltage shipborne inverter circuit according to claim 2, characterized in that, The basic parameters include the rated power and rated capacity of the electric boat power supply. The real-time operating parameters are the real-time electrical operating data of the electric boat, including active power, reactive power, SOC, three-phase voltage, three-phase current, SOH, and power factor. The interlocking data includes the interlocking mode, interlocking reason, and interlocking information; The planned declaration includes potential declaration, regulating capacity declaration, and quantity-price declaration. The declaration period includes day-ahead declaration and real-time declaration. Potential declaration includes day-ahead planned adjustable quantity and real-time adjustable quantity. Regulating capacity declaration is for the grid dispatch and peak-shaving market, and the adjustable capacity within the defined time period is reported day-ahead. Quantity-price declaration is for the electricity spot market, and is reported on a rolling basis day-ahead and intraday according to market prices.

4. The ship-to-grid interaction system based on a low-voltage shipborne inverter circuit according to claim 2, characterized in that, The planned adjustment data includes planned time and power requirements; The real-time adjustment data includes real-time power.

5. The ship-to-grid interaction system based on a low-voltage shipborne inverter circuit according to claim 2, characterized in that, The shipboard interactive module and the ship-to-grid interactive coordination module achieve power exchange between the grid side and the ship-to-grid side through an interactive two-way interface device, which is the charging and discharging of the electric ship. Furthermore, the shipboard interaction module and the ship-to-network interaction and coordination module optimize the charging and discharging timing of the electric ship based on data from two-way communication. The process includes: Construct a multi-objective weighted synthesis function; Acquire data and real-time status, and dynamically adjust the weights in the multi-objective weighted synthesis function; A multi-objective solution method is used to solve and execute the solution.

6. The ship-to-grid interaction system based on a low-voltage shipborne inverter circuit according to claim 5, characterized in that, The multi-objective weighted synthesis function is: ； ； ； ； in , , These represent the economic benefits of energy storage charging and discharging, the economic benefits of active power support, and the economic benefits of reactive voltage support, respectively. , , These represent the weighting coefficients; T represents the total number of time intervals in the optimization time domain. This represents the electricity price during time period t. express, express, express, express, Indicates the duration of a single time period; This represents the actual net active power dispatched. This indicates the active power reference command issued by the power grid; Indicates time period The actual voltage at the grid connection point, This indicates the rated voltage, which is the target voltage.

7. The ship-to-grid interaction system based on a low-voltage shipborne inverter circuit according to claim 6, characterized in that, The strategy for dynamically adjusting the weights is as follows: ； in It is a state-sensitive function. , ; The dynamic weight of the i-th control objective at time t is used to allocate the priority of each objective in multi-objective optimization. Let t be the actual load. This is the load threshold; the function only takes effect when the load exceeds the threshold.

8. The ship-to-grid interaction system based on a low-voltage shipborne inverter circuit according to claim 6, characterized in that, When using a multi-objective solution method to solve a multi-objective weighted synthesis function, constraints are set, including: Power limits: Where P is active power and Q is reactive power. Apparent power; Voltage safety: ; , The voltage limit is set; Operational support: Before departure SOC stands for State of Charge of the energy storage, and SOCreq is the reference limit value for SOC.

9. A ship-to-grid interaction method based on a low-voltage shipborne inverter circuit, characterized in that, Includes the following steps: Step 1: Construct an electric ship-grid collaborative interaction system architecture, including a shipboard interaction module, a bidirectional interaction interface device, and a ship-grid interaction collaboration module; The ship-grid interaction and coordination module is located on the power grid side and is connected to the interactive two-way interface device and the power grid control system to realize interconnection and coordination between them. The shipborne interactive module is installed on the shipborne control side, communicates with the shipborne EMS system, and is interconnected with the interactive control module of the interactive two-way interface device to realize two-way communication connection and information interaction. The interactive two-way interface device includes a shipboard interface module, an AC / DC conversion module, a DC / AC conversion module, a power grid connection module, and an interactive control module. The shipboard interface module is connected to the shipboard electrical system, the AC / DC conversion module and the DC / AC conversion module are used to rectify and invert the AC power supplied by the shipboard, so as to realize the flexible control of the shipboard power supply, and the power grid connection module is connected to the power grid electrical system. Step 2: Based on the electric ship-grid collaborative interaction system architecture, construct a two-way communication strategy; Step 3: Based on the electric ship-grid collaborative interaction system architecture and its two-way communication strategy, realize ship-grid collaborative interaction applications and optimize the charging and discharging timing of electric ships, including: Construct a multi-objective weighted synthesis function; Acquire data and real-time status, and dynamically adjust the weights in the multi-objective weighted synthesis function; A multi-objective solution method is used to solve and execute the solution.

10. The ship-to-grid interaction method based on a low-voltage shipborne inverter circuit according to claim 9, characterized in that, The shipborne interaction module and the ship-to-network interaction and coordination module achieve bidirectional interactive communication through an interactive bidirectional interface device, including: Basic parameters for timed interaction between the shipborne interaction module and the ship-to-network interaction and coordination module; The shipborne interaction module actively exchanges real-time operating parameters with the ship-network interaction and coordination module; Real-time exchange of interlocking data and interlocking responses between the shipborne interaction module and the ship-to-network interaction and coordination module; The shipborne interaction module and the ship-to-network interaction and coordination module exchange timed plan declaration and response data; The ship-to-network interaction and coordination module sends planned adjustment data and real-time adjustment data to the shipboard interaction module.

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