Medium-voltage power generation vehicle synchronization grid connection device and system

Abstract

This application relates to a medium-voltage generator vehicle synchronization and grid connection device and system, applicable in the field of power technology. The device includes: a power parameter acquisition module, a grid connection synchronization and control module, and a communication module. The power parameter acquisition module is electrically connected to the equipment to be connected to the grid and communicatively connected to the grid connection synchronization and control module. The communication module is connected to both the grid connection synchronization and control module and the generator set, and includes a wireless communication module and / or a CAN-to-fiber optic communication module. The CAN-to-fiber optic communication module is used to establish a fiber optic communication link between the grid connection synchronization and control module and the generator set. The power parameter acquisition module is used to acquire grid parameters from the equipment to be connected to the grid and send these parameters to the grid connection synchronization and control module. The grid connection synchronization and control module is used to transmit the corresponding adjustment signals from the grid parameters to the generator set through the communication module. This device facilitates automated signal acquisition and transmission, thereby improving the efficiency of signal acquisition and transmission.

Description

Technical Field

[0001] This application relates to the field of power technology, and in particular to a medium-voltage generator vehicle synchronous grid connection device and system. Background Technology

[0002] Currently, when performing grid connection operations, a device needs to be installed between the generator set and the equipment to be connected to the grid. This device transmits signals to the generator set for regulation.

[0003] However, existing devices require the use of boundary equipment, backup switch cabinets, or live-line working conditions to complete grid connection operations. Data acquisition and control signal transmission rely on traditional cable connection methods, which places high demands on on-site equipment and working conditions. Synchronous control can only be achieved within a limited distance. Signal acquisition and transmission require a significant amount of manual operation time, resulting in low efficiency in signal acquisition and transmission. Summary of the Invention

[0004] Therefore, it is necessary to provide a medium-voltage generator vehicle synchronous grid connection device and a medium-voltage generator vehicle synchronous grid connection system that can improve the efficiency of signal acquisition and transmission, in order to address the above-mentioned technical problems.

[0005] In a first aspect, this application provides a medium-voltage generator vehicle synchronous grid connection device, comprising: a power parameter acquisition module, a grid connection synchronization and control module, and a communication module; the power parameter acquisition module is electrically connected to the equipment to be connected to the grid and communicatively connected to the grid connection synchronization and control module; the communication module is connected to the grid connection synchronization and control module and the generator set respectively, and the communication module includes a wireless communication module and / or a CAN-to-fiber optic communication module, wherein the CAN-to-fiber optic communication module is used to establish a fiber optic communication link between the grid connection synchronization and control module and the generator set;

[0006] The power parameter acquisition module is used to acquire the grid parameters of the equipment to be connected to the grid and send the grid parameters to the grid connection synchronization and control module.

[0007] The grid connection synchronization and control module is used to transmit the adjustment signal corresponding to the grid parameters to the generator set through the communication module, so as to control the operating status of the generator set to meet the grid connection conditions of the equipment to be connected to the grid.

[0008] In one embodiment, the equipment to be connected to the grid includes a switch cabinet, which is provided with a secondary opening and closing circuit or a live display voltage test hole.

[0009] The input terminal of the power parameter acquisition module is electrically connected to the secondary opening and closing circuit or the voltage detection hole of the live display.

[0010] In one embodiment, the equipment to be connected to the grid includes an overhead line or an FTU opening and closing circuit corresponding to the overhead line;

[0011] The input terminal of the power parameter acquisition module is electrically connected to the overhead line or the FTU opening and closing circuit.

[0012] In one embodiment, the power grid parameters acquired by the power parameter acquisition module include at least one of current, power, phase angle, and voltage.

[0013] In one embodiment, the generator set includes a speed control module and an excitation module, and the output terminal of the grid-connected synchronization and control module is connected to the input terminal of the speed control module and the input terminal of the excitation module, respectively.

[0014] In one embodiment, the adjustment signal includes a speed adjustment signal and an excitation adjustment signal;

[0015] The grid-connected synchronization and control module is used to transmit the speed regulation signal to the speed control module and the excitation regulation signal to the excitation module.

[0016] In one embodiment, the device further includes a protection module, the input of which is connected to the grid-connected synchronization and control module, and the output of which is connected to the grid-connected switch.

[0017] In one embodiment, the protection module is configured to send a disconnect signal to the grid-connected switch upon receiving an abnormal situation signal.

[0018] In one embodiment, the device further includes a communication module, the input of which is connected to the grid-connected synchronization and control module, and the output of which is connected to the mains switch.

[0019] Secondly, this application also provides a medium-voltage generator vehicle synchronous grid connection system, including a generator set, equipment to be connected to the grid, and a medium-voltage generator vehicle synchronous grid connection device as described in any one of the first aspects above;

[0020] The medium-voltage generator vehicle synchronous grid connection device is connected to the generator set and the equipment to be connected to the grid, respectively.

[0021] The aforementioned medium-voltage generator vehicle synchronous grid connection device and medium-voltage generator vehicle synchronous grid connection system automatically collect grid parameters by setting a power parameter acquisition module connected to the equipment to be connected to the grid, and transmit the grid parameters to the grid connection synchronization and control module. The grid connection synchronization and control module then automatically transmits the corresponding adjustment signals to the generator set through the communication module, which is conducive to realizing automated signal transmission and thus improving the efficiency of signal acquisition and transmission. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a medium-voltage generator vehicle synchronous grid connection device in one embodiment;

[0024] Figure 2 This is a schematic diagram of the device structure in a switch cabinet scenario in one embodiment;

[0025] Figure 3 This is a schematic diagram of the device structure in an overhead line scenario in one embodiment;

[0026] Figure 4 This is a schematic diagram of the structure of a medium-voltage generator vehicle synchronous grid connection system in one embodiment. Detailed Implementation

[0027] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0029] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0030] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0031] When used herein, the singular forms of “a,” “an,” and “ / the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0032] In one exemplary embodiment, such as Figure 1 As shown, a medium-voltage generator vehicle synchronous grid-connection device is provided, including: a power parameter acquisition module, a grid-connection synchronization and control module, and a communication module; the power parameter acquisition module is electrically connected to the equipment to be connected to the grid and communicatively connected to the grid-connection synchronization and control module; the communication module is connected to both the grid-connection synchronization and control module and the generator set, and includes a wireless communication module and / or a CAN-to-fiber optic communication module, the CAN-to-fiber optic communication module being used to establish a fiber optic communication link between the grid-connection synchronization and control module and the generator set;

[0033] The power parameter acquisition module is used to collect the grid parameters of the equipment to be connected to the grid and send the grid parameters to the grid synchronization and control module.

[0034] The grid connection synchronization and control module is used to transmit the adjustment signals corresponding to the grid parameters to the generator set through the communication module, so as to control the operating status of the generator set to meet the grid connection conditions of the equipment to be connected to the grid.

[0035] Among them, the medium-voltage generator vehicle synchronous grid connection device can be a full-scenario grid connection control device for a 10 kV generator vehicle.

[0036] Among them, the power parameter acquisition module can be a parameter acquisition device that can stably acquire data without laying a dedicated acquisition cable. Specifically, it can refer to hardware devices or chips used to acquire grid parameters of the equipment to be connected to the grid, such as voltage sensors, current sensors, power transmitters or multi-functional power acquisition instruments.

[0037] Among them, the grid connection synchronization and control module can be a system that receives grid parameters and has built-in core control logic to analyze data and output corresponding control commands. Specifically, it can refer to hardware devices or chips with data processing and control signal output capabilities, such as microprocessors, programmable logic controllers, digital signal processors or integrated control motherboards.

[0038] Among them, the CAN (Controller Area Network) to fiber optic communication module can be a communication link module for establishing ultra-long-distance real-time data exchange between the generator set and the grid-connected synchronization and control module. Specifically, it can refer to hardware devices or chips used to realize the mutual conversion between electrical signals and optical signals, such as photoelectric converters, optical transceivers, or communication circuit boards with integrated photoelectric conversion chips.

[0039] Among them, the equipment to be connected to the grid can be grid-side equipment such as 10 kV switchgear or overhead lines that need to be connected to the generator truck.

[0040] Among them, the generator set can be the core power-generating equipment that is carried on the generator vehicle to provide electrical energy.

[0041] Among them, the optical fiber communication link can be an optical fiber communication transmission channel.

[0042] Among them, grid parameters can be core grid-connected data such as grid current, power, phase angle, and voltage.

[0043] The regulating signal can be a control command used to regulate the generator set speed to achieve frequency synchronization, and to regulate the generator excitation system to achieve voltage and phase synchronization.

[0044] Optionally, in practical applications, the power parameter acquisition module is electrically connected to the device to be connected to the grid, for example, by connecting it to the secondary closing / closing circuit of the device or the voltage detection hole of the live indicator. Without the need for a dedicated acquisition cable, the power parameter acquisition module acquires the grid parameters of the device in real time. The power parameter acquisition module then sends the acquired grid parameters to the grid synchronization and control module in real time. Upon receiving the grid parameters, the grid synchronization and control module generates a corresponding adjustment signal. The grid synchronization and control module transmits the generated adjustment signal to the generator set via a communication module. For example, the signal can be transmitted wirelessly to the generator set, or it can be transmitted via a CAN-to-fiber optic communication module, specifically via a fiber optic communication link. After receiving the adjustment signal, the generator set adjusts its output power, frequency, and phase accordingly until its output parameters are synchronized with the grid parameters of the device to be connected to the grid.

[0045] The aforementioned medium-voltage generator vehicle synchronous grid connection device automatically collects grid parameters by connecting a power parameter acquisition module to the equipment to be connected to the grid, and transmits the grid parameters to the grid synchronization and control module. The grid synchronization and control module then automatically transmits the corresponding adjustment signals to the generator set through the communication module, which is conducive to realizing automated signal transmission and thus improving the efficiency of signal acquisition and transmission.

[0046] In one exemplary embodiment, reference is made to Figure 2 The equipment to be connected to the grid includes switchgear, which is equipped with secondary opening and closing circuits or live indicator voltage test holes.

[0047] The input terminal of the power parameter acquisition module is electrically connected to the secondary opening and closing circuit or the voltage detection hole of the live display.

[0048] Among them, the switchgear can be a 10 kV switchgear, which is a grid-side device used to distribute electrical energy.

[0049] The secondary opening and closing circuit can be a secondary control circuit inside the switchgear used to control the opening and closing of the switch.

[0050] Among them, the live indicator voltage test hole can be a reserved interface on the switch cabinet for detecting whether the equipment is live.

[0051] Optionally, in scenarios where the equipment to be connected to the grid includes switchgear, the switchgear is equipped with a secondary closing / closing circuit or a live-line indicator voltage test hole. The input terminal of the power parameter acquisition module is electrically connected to the secondary closing / closing circuit or the live-line indicator voltage test hole of the switchgear, thereby enabling the power parameter acquisition module to acquire the grid parameters of the switchgear.

[0052] The technical solution provided in this embodiment improves the adaptability and feasibility of grid-connected devices in switchgear scenarios by electrically connecting the input terminal of the power parameter acquisition module to the secondary opening and closing circuit of the switchgear or the voltage detection hole of the live display.

[0053] In one exemplary embodiment, reference is made to Figure 3 The equipment to be connected to the grid includes overhead lines or FTU opening and closing circuits corresponding to overhead lines;

[0054] The input terminal of the power parameter acquisition module is electrically connected to the overhead line or the FTU opening and closing circuit.

[0055] Among them, overhead lines can be outdoor power transmission lines that are in an overhead state.

[0056] Among them, the FTU (feeder terminal unit) opening and closing circuit can be the control circuit in the feeder terminal unit used to control the opening and closing of the line switch.

[0057] Optionally, in scenarios where the equipment to be connected to the grid includes overhead lines, the overhead lines are equipped with FTU (feeder terminal unit) switching circuits. The input terminal of the power parameter acquisition module is electrically connected to the overhead lines or the corresponding FTU switching circuits of the overhead lines, so that the power parameter acquisition module can stably acquire the grid parameters of the overhead lines.

[0058] The technical solution provided in this embodiment, by electrically connecting the input terminal of the power parameter acquisition module to the overhead line or the FTU opening and closing circuit corresponding to the overhead line, facilitates parameter acquisition in the overhead line scenario, thereby improving the convenience of grid connection operation.

[0059] In one exemplary embodiment, the power grid parameters acquired by the power parameter acquisition module include at least one of current, power, phase angle, and voltage.

[0060] Among them, current, power, phase angle, and voltage can be the core grid-connected parameters that reflect the real-time operating status of the power grid.

[0061] Optionally, after the power parameter acquisition module is connected to the device to be connected to the grid, the power parameter acquisition module acquires grid parameters including at least one of the current, power, phase angle and voltage of the device to be connected to the grid, and sends at least one of the acquired current, power, phase angle and voltage to the grid synchronization and control module in real time.

[0062] The technical solution provided in this embodiment acquires at least one grid parameter, including current, power, phase angle, and voltage, through a power parameter acquisition module. This facilitates the grid synchronization and control module in obtaining grid operation status information, thereby enabling precise grid adjustment and synchronization control.

[0063] In one exemplary embodiment, the generator set includes a speed control module and an excitation module, and the output terminal of the grid-connected synchronization and control module is connected to the input terminal of the speed control module and the input terminal of the excitation module, respectively.

[0064] The speed control module can be a control module in a generator set used to regulate the input energy and speed of the engine.

[0065] The excitation module can be a control module in a generator set used to regulate the generator excitation system and output voltage.

[0066] Optionally, the generator set includes a speed control module and an excitation module. The output terminal of the grid-connected synchronization and control module is connected to the input terminal of the speed control module and the input terminal of the excitation module of the generator set, respectively, so that the grid-connected synchronization and control module can send corresponding control signals to the speed control module and the excitation module, respectively.

[0067] The technical solution provided in this embodiment connects the output of the grid-connected synchronization and control module to the speed regulation module and excitation module of the generator set, respectively. This facilitates the establishment of a control channel between the grid-connected synchronization and control module and the core regulating components of the generator set, thereby enabling subsequent independent regulation of the generator set.

[0068] In one exemplary embodiment, the adjustment signals include a speed adjustment signal and an excitation adjustment signal;

[0069] The grid-connected synchronization and control module is used to transmit the speed regulation signal to the speed control module and the excitation regulation signal to the excitation module.

[0070] Among them, the speed regulation signal can be a regulation signal used to control the speed regulation module to change the generator set speed in order to achieve frequency synchronization.

[0071] Among them, the excitation regulation signal can be a regulation signal used to control the excitation module to change the excitation state in order to achieve voltage and phase synchronization.

[0072] Optionally, the regulation signals generated by the grid-connected synchronization and control module specifically include speed regulation signals and excitation regulation signals; the grid-connected synchronization and control module transmits the generated speed regulation signals to the speed control module of the generator set to regulate the frequency of the generator set; at the same time, the grid-connected synchronization and control module transmits the generated excitation regulation signals to the excitation module of the generator set to regulate the voltage and phase of the generator set.

[0073] The technical solution provided in this embodiment transmits the speed regulation signal to the speed control module and the excitation regulation signal to the excitation module through the grid-connected synchronization and control module. This facilitates the realization of frequency synchronization and voltage and phase synchronization, thereby ensuring that the output parameters of the generator set accurately meet the grid connection conditions.

[0074] In one exemplary embodiment, the device further includes a protection module, the input of which is connected to the grid-connected synchronous control module, and the output of which is connected to the grid-connected switch.

[0075] The protection module can be a device used to monitor abnormal situations and perform protective actions during grid connection.

[0076] Among them, the grid connection switch can be a switching device that controls the physical connection between the generator set and the power grid.

[0077] Optionally, the medium-voltage generator synchronizing grid connection device also includes a protection module, which connects the input terminal of the protection module to the grid synchronization and control module to receive the status information monitored by the grid synchronization and control module, and connects the output terminal of the protection module to the grid connection switch so that the protection module can control the operation of the grid connection switch.

[0078] The technical solution provided in this embodiment, by adding a protection module and connecting the protection module, grid connection synchronization, control module, and grid connection switch, facilitates real-time monitoring of the operating status during grid connection, thereby enabling timely disconnection of the grid connection in case of abnormalities and preventing equipment damage.

[0079] In one exemplary embodiment, the protection module is configured to send a disconnect signal to the grid-connected switch upon receiving an abnormal situation signal.

[0080] Among them, abnormal situation signals can be indication signals of abnormal states such as parameter deviation exceeding the threshold, overload, short circuit, or reverse power.

[0081] The disconnect signal can be a signal that triggers the grid-connected switch to perform a tripping action.

[0082] Optionally, during grid connection, if abnormal situations such as parameter deviation exceeding the threshold, overload, short circuit, or reverse power occur, the protection module will immediately act upon receiving the abnormal situation signal, sending a disconnection signal to the grid connection switch to disconnect the grid connection switch and cut off the connection between the generator set and the power grid.

[0083] The technical solution provided in this embodiment sends a disconnect signal to the grid-connected switch when the protection module receives an abnormal situation signal. This facilitates rapid response to sudden faults during the grid connection process, thereby improving the stability and safety of grid-connected operation and preventing the scope of the fault from expanding.

[0084] In one exemplary embodiment, the device further includes a communication module, the input of which is connected to the grid synchronization and control module, and the output of which is connected to the mains power switch.

[0085] The communication module can be a 485 communication module.

[0086] Among them, the mains switch can be a switching device that controls the connection and disconnection of mains power.

[0087] Optionally, the medium-voltage generator vehicle synchronization and grid connection device also includes a communication module, which connects the input end of the communication module to the grid synchronization and control module and the output end of the communication module to the mains switch, so that the grid synchronization and control module can send remote control commands to the mains switch through the communication module.

[0088] The technical solution provided in this embodiment, by setting up a communication module and connecting it to the grid-connected control module and the mains switch, facilitates remote control of the mains switch, thereby enabling seamless closing of the mains switch and seamless disconnection after grid connection is completed.

[0089] In one exemplary embodiment, reference is made to Figure 4 A medium-voltage generator vehicle synchronous grid connection system is provided, including a generator set, equipment to be connected to the grid, and a medium-voltage generator vehicle synchronous grid connection device according to any of the above embodiments; the medium-voltage generator vehicle synchronous grid connection device is connected to the generator set and the equipment to be connected to the grid respectively.

[0090] Optionally, the medium-voltage generator vehicle synchronous grid connection system includes a generator set, equipment to be connected to the grid, and a medium-voltage generator vehicle synchronous grid connection device (including a power parameter acquisition module, a grid connection synchronization and control module, and a communication module). During system setup, the medium-voltage generator vehicle synchronous grid connection device is connected to the generator set and the equipment to be connected to the grid, respectively, so that the medium-voltage generator vehicle synchronous grid connection device can acquire the parameters of the equipment to be connected to the grid and adjust the operating status of the generator set.

[0091] The technical solution provided in this embodiment, by constructing a system that includes generator sets, equipment to be connected to the grid, and a medium-voltage generator vehicle synchronous grid connection device, is conducive to forming a complete grid connection control architecture, thereby facilitating seamless grid connection exit operations in multiple scenarios and improving the applicability of the system.

[0092] The following describes the medium-voltage generator vehicle synchronous grid connection device provided in this application using an embodiment, with reference to... Figures 1-4 .

[0093] As society's demands for reliable and continuous power supply continue to rise, 10kV mobile generators are increasingly being used in disaster relief and large-scale event support. The industry is demanding an upgrade in their grid connection and disconnection technologies, moving from "short-term power outages" to "unnoticeable disconnection." In the application of secondary grid connection (unnoticeable disconnection) technology, relevant solutions require connecting a set of cables to the power source side to be connected for data acquisition and temporary bypassing. This technical approach has become a bottleneck in industry applications.

[0094] The implementation of the relevant 10kV generator vehicle secondary grid connection technology depends on cable laying and specific access point conditions. It requires the cooperation of boundary equipment, backup switchgear or live working conditions to complete the grid connection operation. Data acquisition and control signal transmission rely on traditional cable connection methods. Synchronous control can only be achieved within a limited distance. Moreover, the power parameter sampling, power regulation and equipment communication in the grid connection process have not formed an integrated adaptation solution, which cannot adapt to the grid connection needs of multiple scenarios such as switchgear and overhead lines.

[0095] The related 10kV generator vehicle secondary grid connection (seamless disconnection) technology requires data collection and temporary bypass construction on the side of the power supply to be connected via cable, which has a very low feasibility rate and cannot meet the actual needs of grid connection in multiple scenarios, which seriously restricts the promotion of seamless technology. Moreover, (1) there is a lack of suitable access points. Due to the limitations of generator vehicle parking, environment and equipment configuration, if there is no boundary equipment at the access point and the distance to the upstream equipment exceeds 200 meters, the cable laying is difficult; (2) the selection of access points is restricted. Overhead lines need to meet the conditions for live operation, and cable lines need to be equipped with spare switch cabinets, which are very demanding; (3) the construction cost is too high. The access cable is heavy and requires more than 3 people to carry out the construction. The access of overhead lines also requires professional live operation personnel. The access and dismantling costs far exceed the actual value of grid connection; (4) the traditional communication and sampling methods have poor compatibility. It is impossible to stably obtain power parameters from multiple locations such as the access hole of the switch cabinet live display and overhead lines. Moreover, the communication distance between equipment is limited and the synchronous control accuracy is insufficient.

[0096] The 10kV generator truck full-scenario grid-connection control device in this embodiment integrates three core components: a multi-scenario power parameter acquisition device, a grid-connection synchronization and control system, and a communication module (wireless communication module and / or CAN-to-fiber optic communication module), forming an integrated technical solution. This addresses the technical pain points of secondary grid connection for existing 10kV generator trucks and enables seamless grid disconnection operations in multiple scenarios, including switchgear and overhead lines. The specific structure and operation mode are as follows:

[0097] Core components and functions:

[0098] (1) Power parameter acquisition device: It can be adapted to two or more access environments, such as the live display access hole of the switch cabinet and the adjacent overhead line. It can stably acquire core grid-connected parameters such as grid current, power, phase angle, and voltage. There is no need to lay a special acquisition cable, which breaks through the condition limitations of traditional access points.

[0099] (2) Grid-connected synchronization and control system: It is linked with the data acquisition device to receive grid parameters in real time. It has built-in core control logic and can accurately adjust the grid-connected power according to the sampled data, and realize the remote opening and closing operation of the mains switch.

[0100] (3) CAN to Fiber Optic Communication Module: Establishes a communication link between the generator set and the grid-connected control system, replacing the traditional cable communication method, realizing real-time data exchange over ultra-long distances. It also supports the mains controller to sample real-time data from the grid backend via 485 to CAN, ensuring the stability and timeliness of communication between devices. Wireless Communication Module: Establishes a wireless communication link between the generator set and the grid-connected control system, replacing the traditional cable communication method.

[0101] Device operation process:

[0102] (1) Sampling stage: According to the actual grid connection scenario (switch cabinet / overhead line), connect the acquisition device to the corresponding location (switch cabinet live display voltage test hole / overhead line FTU opening and closing circuit) to complete the cableless acquisition of grid parameters and transmit the data to the grid connection synchronization and control system in real time;

[0103] (2) Synchronization adjustment stage: After receiving the sampled data, the control system adjusts the generator speed to achieve frequency synchronization and adjusts the generator excitation system to achieve voltage and phase synchronization in accordance with the grid connection standards (frequency 50Hz±0.1Hz, voltage deviation ≤±5%, phase difference close to 0°) until the grid connection conditions are met.

[0104] (3) Grid connection execution stage: After the grid connection conditions are met, the control system can automatically complete the grid connection operation and monitor the grid connection operation status in real time. It adjusts the active / reactive power of the generator set according to the load demand (active power is achieved by adjusting the energy input of the engine, and reactive power is achieved by adjusting the excitation system).

[0105] (4) Protection and exit stage: If abnormal situations such as parameter deviation exceeding the threshold, overload, short circuit, reverse power occur during grid connection, the protection device will immediately take action to stop the grid connection process or continue the grid connection process. Closing the switch means that the grid connection is successful. After the grid connection is completed, the mains switch is closed without contact through 485 remote control to complete the secondary grid connection (without contact) operation of the generator car.

[0106] Multi-scenario adaptation structure:

[0107] (1) Reference Figure 2 Switchgear scenario: Connect the acquisition device to the secondary opening and closing circuit / voltage test hole of the 10kV switchgear, and connect the generator truck outgoing cable directly to the appropriate load position of the switchgear. The linkage between the device and the switchgear is realized through 485 communication.

[0108] (2) Reference Figure 3 In the overhead line scenario: the acquisition device is connected to the FTU opening and closing circuit of the overhead line, and the generator truck's outgoing cable is connected to the corresponding load position of the overhead line. Remote data interaction between the device and the generator set and the power grid backend is realized by relying on CAN to fiber optic communication and / or wireless communication.

[0109] The power parameter acquisition device adapted to 10kV generator vehicle for multi-scenario grid connection in this embodiment can stably acquire grid connection parameters from two or more environments, such as the live display access hole of the switch cabinet and the adjacent overhead line, without the need to lay a dedicated acquisition cable.

[0110] The overall structure of the 10kV generator vehicle full-scenario grid-connected control device in this embodiment integrates a power parameter acquisition device, a grid-connected synchronization and control system, and a communication module (CAN to fiber optic communication module and / or wireless communication module) to achieve integrated operation of sampling, synchronization, control, communication, and protection.

[0111] The control logic of the grid-connected synchronization and control system in this embodiment can automatically adjust the frequency, voltage and phase of the generator set according to the sampled grid parameters to meet the grid connection conditions of frequency deviation ≤ ±0.1Hz, voltage deviation ≤ ±5% and phase difference close to 0°, and can realize precise adjustment of grid-connected power and remote control of mains power switch.

[0112] The multi-scenario operation method for secondary grid connection of 10kV generator vehicle in this embodiment is as follows: a dedicated access and linkage method is designed for switchgear and overhead line scenarios. In the switchgear scenario, the live display voltage test hole / secondary opening and closing circuit is connected, and in the overhead line scenario, the FTU opening and closing circuit is connected, both of which realize grid connection operation without dedicated cables.

[0113] The ultra-long-distance communication method between the generator vehicle and the power grid in this embodiment is as follows: a communication module (CAN to fiber optic communication module and / or wireless communication module) is used to realize real-time data exchange between the generator set and the grid-connected control system, realizing grid-connected communication within a range of several kilometers.

[0114] The technical solution provided in this embodiment achieves the following: (1) It abandons the traditional secondary grid connection mode of "cable acquisition + temporary bypass", realizes power parameter acquisition and grid connection control without dedicated cables, greatly improves the feasibility of secondary grid connection (seamless exit) of 10kV generator vehicles, and breaks the core bottleneck of technology promotion; (2) It breaks through the access point limitation, does not rely on boundary equipment, backup switch cabinets, or professional live-line work, and the access points can be the live-line display access holes of switch cabinets, overhead lines, etc., without the difficulty of laying cables; (3) It greatly reduces the construction cost, does not require multiple people to lay heavy cables, and does not require professional live-line work personnel; (4) It improves the multi-scenario Adaptability: It can be stably connected to the grid in various scenarios such as switch cabinets and overhead lines, and meet the grid connection needs of different sites such as natural disasters and large-scale events; (5) Improve the stability and safety of grid connection operation: It can accurately collect grid connection parameters and accurately adjust power, and the voltage fluctuation of grid connection operation does not exceed ±5%, ensuring the continuity of power supply; It is equipped with a complete grid connection, overload, short circuit and reverse power protection mechanism to prevent equipment damage and fault expansion; (6) Achieve ultra-long distance communication and control: By converting CAN to fiber optic communication and / or wireless communication, it breaks through the communication distance limit of traditional cables, and the generator set and the power grid can be connected to the grid at a distance of several kilometers, improving the convenience of operation.

[0115] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0116] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. 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 application should be determined by the appended claims.

Claims

1. A medium-voltage power generation vehicle synchronization grid-connection device, characterized by, include: Power parameter acquisition module, grid connection synchronization and control module, and communication module; The power parameter acquisition module is electrically connected to the equipment to be connected to the grid and is communicatively connected to the grid synchronization and control module; the communication module is connected to the grid synchronization and control module and the generator set respectively, and the communication module includes a wireless communication module and / or a CAN to fiber optic communication module. The CAN to fiber optic communication module is used to establish a fiber optic communication link between the grid synchronization and control module and the generator set. The power parameter acquisition module is used to acquire the grid parameters of the equipment to be connected to the grid and send the grid parameters to the grid connection synchronization and control module. The grid connection synchronization and control module is used to transmit the adjustment signal corresponding to the grid parameters to the generator set through the communication module, so as to control the operating status of the generator set to meet the grid connection conditions of the equipment to be connected to the grid.

2. The apparatus of claim 1, wherein, The equipment to be connected to the grid includes a switch cabinet, which is equipped with a secondary opening and closing circuit or a live display voltage test hole. The input terminal of the power parameter acquisition module is electrically connected to the secondary opening and closing circuit or the voltage detection hole of the live display.

3. The apparatus of claim 1, wherein, The equipment to be connected to the grid includes an overhead line or the FTU opening and closing circuit corresponding to the overhead line. The input terminal of the power parameter acquisition module is electrically connected to the overhead line or the FTU opening and closing circuit.

4. The apparatus of claim 1, wherein, The power grid parameters acquired by the power parameter acquisition module include at least one of current, power, phase angle, and voltage.

5. The apparatus of claim 1, wherein, The generator set includes a speed control module and an excitation module. The output terminal of the grid-connected synchronization and control module is connected to the input terminal of the speed control module and the input terminal of the excitation module, respectively.

6. The apparatus of claim 5, wherein, The adjustment signals include speed adjustment signals and excitation adjustment signals; The grid-connected synchronization and control module is used to transmit the speed regulation signal to the speed control module and the excitation regulation signal to the excitation module.

7. The apparatus of claim 1, wherein, The device also includes a protection module, the input of which is connected to the grid-connected synchronous control module, and the output of which is connected to the grid-connected switch.

8. The apparatus of claim 7, wherein, The protection module is used to send a disconnect signal to the grid-connected switch when it receives an abnormal situation signal.

9. The apparatus of claim 1, wherein, The device also includes a communication module, the input of which is connected to the grid-connected synchronization and control module, and the output of which is connected to the mains power switch.

10. A medium voltage power car synchronization grid connection system, characterized by, Includes generator sets, equipment to be connected to the grid, and a medium-voltage generator vehicle synchronous grid connection device as described in any one of claims 1 to 9; The medium-voltage generator vehicle synchronous grid connection device is connected to the generator set and the equipment to be connected to the grid, respectively.

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