Power distribution area flexible access exit device based on dual-synchronization technology

Abstract

The utility model relates to the technical field of circuit electronic control, and discloses a power distribution area flexible access and exit device based on a dual-synchronization technology. Comprising a device shell, and a synchronous control assembly, a power supply assembly, an opening and closing switch assembly, a power grid side terminal and a power generation side terminal which are located in the device shell, the power grid side terminal is electrically connected with the power generation side terminal through the opening and closing switch assembly, the power grid voltage detection end and the power grid current detection end of the synchronization control assembly are electrically connected with the power grid side terminal, and the power generation voltage detection end of the synchronization control assembly is electrically connected with the power generation side terminal. The opening and closing control end of the synchronous control assembly is electrically connected with the opening and closing switch assembly; the generator control end of the synchronous control assembly is in communication connection with power generation equipment in a power distribution area, and the power supply assembly is electrically connected with the synchronous control assembly. According to the utility model, the safety and stability of residential electricity utilization in the maintenance process are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit electronic control, in particular to a flexible access and exit device for a distribution station area based on a double synchronization technology. Background Art

[0002] As demand for power supply reliability continues to rise, power systems must be able to operate without power outages even during maintenance. For example, at a distribution station, maintenance work previously required disconnecting the mains power switch before connecting the generator truck. After the maintenance was complete, the generator truck was disconnected before connecting the mains power switch. This process involved two power outages. While brief, it impacted residents' quality of life and the grid company's demanding power quality.

[0003] Currently, some technologies have proposed devices and corresponding methods for synchronous grid connection of generator vehicles. The general idea is to first connect the generator vehicle to the grid during maintenance, and then disconnect the mains after the connection. After the maintenance is completed, the mains is connected in reverse order, and then disconnect the generator vehicle. This method can certainly achieve uninterrupted operation, but it is insufficient in the following aspects:

[0004] 1. At the beginning of the maintenance, the generator truck is put into operation through synchronous grid connection. When the mains is disconnected, the load will be transferred from the mains to the generator truck. If the load is large and the generator truck is not adjusted in time, the generator will be disconnected from the grid. At this time, the mains has been disconnected, which will directly cause the load to be out of power.

[0005] 2. When the generator car is disconnected after the reverse synchronization with the grid and the mains is supplied, the generator car will suddenly shed load. If it is not adjusted in time, it may cause the car to run away and damage the generator. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a flexible access and exit device for distribution station area based on dual synchronization technology, so as to realize seamless transfer of load during the access and exit of generators and improve the safety and stability of residents' electricity use during the maintenance process.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A flexible access device for a distribution substation based on dual synchronization technology includes a device housing, a synchronization control component, a power supply component, an opening and closing switch component, a grid-side terminal, and a power generation-side terminal for connecting to power generation equipment in the distribution substation.

[0009] The grid-side terminal is electrically connected to the power generation side terminal through the opening and closing switch assembly, the grid voltage detection terminal and the grid current detection terminal of the synchronization control assembly are both electrically connected to the grid-side terminal, the power generation voltage detection terminal of the synchronization control assembly is electrically connected to the power generation side terminal, and the opening and closing control terminal of the synchronization control assembly is electrically connected to the opening and closing switch assembly;

[0010] The generator control terminal of the synchronization control component is used for communication connection with the power generation equipment in the distribution station area, and the power supply component is electrically connected to the synchronization control component;

[0011] The synchronization control component performs synchronization judgment through the voltage signals monitored by the grid voltage detection terminal and the power generation voltage detection terminal, and controls the opening and closing switch component to close the switch when the synchronization condition is met;

[0012] The synchronization control component is further used to calculate the output power of the power generation vehicle by measuring the voltage and current at the grid voltage detection terminal and the grid current detection terminal, and compare it with the load power. After the forward synchronization is completed, the output power of the power generation vehicle is adjusted to a first preset adjustment range before the mains is disconnected. After the reverse synchronization is completed, the output power of the power generation vehicle is adjusted to a second preset adjustment range before the power generation vehicle is disconnected. The calculation of the output power of the power generation vehicle and the adjustment of the output power of the power generation vehicle to the first preset adjustment range or the second preset adjustment range can both be achieved by existing algorithms.

[0013] The power supply component includes a power supply switch;

[0014] The first input end of the power supply switch is electrically connected to the grid-side terminal, and the second input end of the power supply switch is electrically connected to the power generation-side terminal;

[0015] The output end of the power supply switching switch is electrically connected to the synchronization control component, and the power supply switching switch is used to automatically switch to the other end after power is lost at either the grid side terminal or the power generation side terminal.

[0016] Furthermore, the synchronization control component includes a main control module, a measurement module, a synchronization calculation module and a synchronization adjustment module;

[0017] The main control module is electrically connected to the synchronization calculation module, the synchronization adjustment module, the power supply component and the opening and closing switch component respectively;

[0018] The synchronization calculation module is electrically connected to the measurement module, and the grid voltage detection terminal, the grid current detection terminal and the power generation voltage detection terminal are all located on the measurement module;

[0019] The synchronization calculation module is electrically connected to the synchronization adjustment module, and the synchronization adjustment module is communicatively connected to the power generation equipment in the distribution station area;

[0020] The measurement module is used to calculate the voltage difference, phase difference and frequency difference between the power grid and the power generation end in real time, and send them to the synchronization calculation module. The synchronization calculation module is used to determine whether the synchronization conditions are met and output the results to the main control module.

[0021] Furthermore, the synchronization control component further includes an input and output module;

[0022] The main control module is electrically connected to the opening and closing switch assembly through the opening and closing module.

[0023] Furthermore, the synchronization control component further includes a human-machine interface module;

[0024] The main control module is electrically connected to the human-machine interface module, and the human-machine interface module is used to connect to an external touch display device.

[0025] Furthermore, the synchronization control component further includes a load adjustment module;

[0026] The main control module is electrically connected to the load adjustment module, and the load adjustment module is communicatively connected to the power generation equipment in the distribution station area;

[0027] The load regulation module is used to provide forward load regulation and reverse load regulation: when the forward load regulation function is triggered, the power generation equipment in the distribution area is controlled to output within a first preset regulation range; when the reverse regulation function is triggered, the power generation equipment in the distribution area is controlled to output within a second preset regulation range.

[0028] Furthermore, it also includes a control button assembly;

[0029] The control button assembly is electrically connected to the synchronization control assembly and the power supply assembly respectively.

[0030] Furthermore, the control button assembly includes a power button, a power stop button, a power start button and a synchronous closing button;

[0031] The power button is electrically connected to the power supply component, and the synchronization control component is electrically connected to the power generation stop button, the power generation start button and the synchronization closing button respectively.

[0032] Furthermore, it also includes a status indicator light;

[0033] The status indicator lights are electrically connected to the synchronization control component and the power supply component respectively.

[0034] Further, a communication component is included;

[0035] The generator control terminal of the synchronization control component is connected to the power generation equipment in the distribution station area through the communication component.

[0036] From the above description, it can be seen that the beneficial effects of the present invention are: the grid-side terminals and the power generation side terminals are respectively connected to the power supply output terminals of the power generation equipment in the power distribution station area, and the grid-connected state and off-grid state of the power generation equipment in the power distribution station area are switched through the opening and closing switch components; whether it is forward synchronization or reverse synchronization, a smooth transition is ensured during the generator input and exit process, anomalies caused by sudden load changes are avoided, and seamless transfer of load is achieved during the generator input and exit process, thereby improving the safety and stability of residents' electricity use during the maintenance process. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the internal structure of a flexible access and exit device for a distribution area based on double synchronization technology in the utility model;

[0038] Figure 2 The present invention is a schematic diagram of the composition structure of a synchronization control component of a flexible access and exit device for a distribution station area based on dual synchronization technology.

[0039] Description of labels:

[0040] 1. Device housing; 2. Power generation equipment in the distribution area; 3. Synchronous control components; 4. Communication components;

[0041] 31. Main control module; 32. Measurement module; 33. Synchronous calculation module; 34. Synchronous adjustment module; 35. Input and output module; 36. Human-machine interface module; 37. Load adjustment module;

[0042] J1, grid side terminal; J2, generator side terminal;

[0043] K1, power supply assembly; K2, opening and closing switch assembly; K3, power button; K4, power stop button; K5, power start button; K6, synchronous closing button;

[0044] LED, status indicator. DETAILED DESCRIPTION

[0045] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

[0046] Please refer to Figure 1 and Figure 2 A flexible access device for a distribution substation based on dual synchronization technology includes a device housing 1, a synchronization control component 3, a power supply component K1, an opening and closing switch component K2, a grid-side terminal J1, and a power generation terminal J2 for connecting to a power generation device 2 in a distribution substation.

[0047] The grid-side terminal J1 is electrically connected to the power generation side terminal J2 through the opening and closing switch assembly K2, the grid voltage detection terminal and the grid current detection terminal of the synchronization control assembly 3 are both electrically connected to the grid-side terminal J1, the power generation voltage detection terminal of the synchronization control assembly 3 is electrically connected to the power generation side terminal J2, and the opening and closing control terminal of the synchronization control assembly 3 is electrically connected to the opening and closing switch assembly K2;

[0048] The generator control terminal of the synchronization control component 3 is used to communicate with the power generation equipment 2 in the distribution station area, and the power supply component K1 is electrically connected to the synchronization control component 3. The synchronization control component 3 is used to perform synchronization judgment through the voltage signals monitored by the grid voltage detection terminal and the power generation voltage detection terminal, and close the circuit breaker by controlling the opening and closing switch component K2 when the synchronization conditions are met;

[0049] The synchronization control component is also used to calculate the output power of the power generation vehicle through the voltage and current measured by the grid voltage detection terminal and the grid current detection terminal, and compare it with the load power. After the forward synchronization is completed, the output power of the power generation vehicle is adjusted to reach the first preset adjustment range before the mains power is disconnected. After the reverse synchronization is completed, the output power of the power generation vehicle is adjusted to reach the second preset adjustment range before the power generation vehicle is disconnected. The calculation of the output power of the power generation vehicle and the adjustment of the output power of the power generation vehicle to the first preset adjustment range or the second preset adjustment range can both be achieved by existing algorithms.

[0050] From the above description, it can be seen that the beneficial effects of the present invention are: the grid-side terminal J1 and the power generation side terminal J2 are respectively connected to the power grid and the power supply output end of the power generation equipment 2 in the distribution station area, and the grid-connected state and the off-grid state of the power generation equipment 2 in the distribution station area are switched through the opening and closing switch component K2; whether it is forward synchronization or reverse synchronization, a smooth transition is ensured during the generator input and exit process, anomalies caused by sudden load changes are avoided, and seamless transfer of load is achieved during the generator input and exit process, thereby improving the safety and stability of residents' electricity use during the maintenance process.

[0051] Furthermore, the power supply component K1 includes a power supply switch;

[0052] The first input end of the power supply switch is electrically connected to the grid-side terminal J1, and the second input end of the power supply switch is electrically connected to the power generation side terminal J2;

[0053] The output end of the power supply switching switch is electrically connected to the synchronization control component 3. The power supply switching switch is used to automatically switch to the other end after power is lost at either the grid side terminal J1 or the power generation side terminal J2.

[0054] As can be seen from the above description, the setting of the power supply switching switch allows the power supply source of the device to be flexibly switched. When the power grid is supplying power normally, the power supply switching switch introduces the power energy from the grid-side terminal J1 to power the synchronous control component 3, ensuring the stable operation of the device. In special scenarios such as when the power generation equipment 2 in the distribution area is connected and the power grid is outage, the power supply switching switch can switch to the power generation terminal J2 for power supply, ensuring that the synchronous control component 3 can still work normally when the power grid is outage, and continuously monitor and control the access and exit status of the power generation equipment 2 in the distribution area. This not only avoids the risk of device failure due to a single power supply failure, but also can adapt to complex and changing power consumption environments, improving the fault tolerance and operating efficiency of the entire distribution area system.

[0055] Furthermore, the synchronization control component 3 includes a main control module 31, a measurement module 32, a synchronization calculation module 33 and a synchronization adjustment module 34;

[0056] The main control module 31 is electrically connected to the synchronization calculation module 33, the synchronization adjustment module 34, the power supply component K1 and the opening and closing switch component K2 respectively;

[0057] The synchronization calculation module 33 is electrically connected to the measurement module 32, and the grid voltage detection terminal, the grid current detection terminal and the power generation voltage detection terminal are all located on the measurement module 32;

[0058] The synchronization calculation module 33 is electrically connected to the synchronization adjustment module 34, and the synchronization adjustment module 34 is communicatively connected to the power generation equipment 2 in the distribution station area;

[0059] The measurement module 32 is used to calculate the voltage difference, phase difference and frequency difference between the power grid and the power generation terminal in real time, and send them to the synchronization calculation module 33. The synchronization calculation module 33 is used to determine whether the synchronization conditions are met and output the results to the main control module 31.

[0060] As can be seen from the above description, the synchronization control component 3 is divided into a main control module 31, a measurement module 32, a synchronization calculation module 33, and a synchronization adjustment module 34. Each module functions independently. If a module fails, it can be quickly located and repaired or replaced independently, eliminating the need for large-scale overhaul of the entire synchronization control component 3, thus reducing maintenance costs and time. Based on the calculation results of the synchronization calculation module 33, the synchronization adjustment module 34 communicates with the power generation equipment 2 in the distribution area, adjusting the output of the power generation equipment 2 in real time to ensure that the voltage, frequency, and phase of the power generation equipment 2 are consistent with those of the power grid. The measurement module 32 is responsible for collecting grid-side voltage and current and generator-side voltage, providing accurate data for synchronization calculations. Based on the data provided by the measurement module 32, the synchronization calculation module 33 accurately calculates parameters such as the voltage difference, frequency difference, and phase difference between the power grid and the power generation equipment 2 in the distribution area, providing a basis for subsequent adjustments. This clearly defined division of labor between measurement and calculation improves the accuracy of synchronization judgments and ensures that the power generation equipment 2 in the distribution area can operate on or off the grid while meeting strict synchronization requirements.

[0061] Furthermore, the synchronization control component 3 also includes an input and output module 35;

[0062] The main control module 31 is electrically connected to the opening and closing switch assembly K2 through the input and output module 35 .

[0063] From the above description, it can be seen that the input and output module 35 serves as a bridge between the main control module 31 and the opening and closing switch component K2. It can receive the control instructions of the main control module 31 and accurately transmit them to the opening and closing switch component K2 to achieve flexible control of the switch.

[0064] Furthermore, the synchronization control component 3 also includes a human-machine interface module 36;

[0065] The main control module 31 is electrically connected to the human-machine interface module 36 , and the human-machine interface module 36 is used to connect to an external touch display device.

[0066] As can be seen from the above description, human-machine interface module 36 connects to an external touch display device, creating an intuitive user interface. Without complex operations, personnel can conveniently view real-time voltage and current data from the grid and generator sides, as well as various parameters and status information during the synchronization control process, such as voltage difference, frequency difference, and phase difference. Using human-machine interface module 36 and the external touch display device, personnel can flexibly configure various parameters of synchronization control component 3, such as setting the allowable error ranges for voltage, frequency, and phase, and adjusting the control strategy of synchronization adjustment module 34.

[0067] Furthermore, the synchronization control component 3 also includes a load adjustment module 37;

[0068] The main control module 31 is electrically connected to the load adjustment module 37, and the load adjustment module 37 is communicatively connected to the power generation equipment 2 in the distribution station area;

[0069] The load regulation module 37 is used to provide forward load regulation and reverse load regulation: when the forward load regulation function is triggered, the power generation equipment in the distribution area is controlled to output within a first preset regulation range; when the reverse regulation function is triggered, the power generation equipment in the distribution area is controlled to output within a second preset regulation range.

[0070] From the above description, it can be seen that the load regulation module 37 can monitor the output voltage of the power generation equipment 2 in the distribution station area in real time. When it is detected that the voltage exceeds or is lower than the set safety range, it will quickly take adjustment measures to reduce or increase the output voltage of the power generation equipment 2 in the distribution station area to avoid damage to the equipment caused by overvoltage and undervoltage, and ensure the safe operation of the power system.

[0071] Furthermore, it also includes a control button assembly;

[0072] The control button assembly is electrically connected to the synchronization control assembly 3 and the power supply assembly K1 respectively.

[0073] As can be seen from the above description, personnel can directly use the control button component to perform operations, such as starting or stopping the synchronization control process and switching the power source of the power supply component K1. This diverse operation method enhances the flexibility of the device and ensures effective control of the device in various complex situations.

[0074] Furthermore, the control button assembly includes a power button K3, a power generation stop button K4, a power generation start button K5 and a synchronous closing button K6;

[0075] The power button K3 is electrically connected to the power supply component K1 , and the synchronization control component 3 is electrically connected to the power generation stop button K4 , the power generation start button K5 , and the synchronization closing button K6 , respectively.

[0076] As can be seen from the above description, the functions of various buttons are clear and well-defined, and they are divided into two parts. The power button K3 is directly connected to the power supply component K1, which can control the power on and off of the entire device with one click. During equipment installation, inspection, and maintenance, it can quickly cut off the power supply to ensure the safety of the staff and facilitate operations such as power off and restart of the device. The power start button K5 and the power stop button K4 cooperate with the synchronous control component 3 to accurately control the start and stop of the power generation equipment 2 in the distribution station area. The staff can easily operate the equipment to start or stop power supply according to the actual power demand or the status of the power generation equipment 2 in the distribution station area, making the operation and management of the power generation equipment 2 in the distribution station area more orderly. The synchronous closing button K6 achieves safe grid connection after confirming that the grid side and the power generation side meet the synchronous conditions, ensuring the standardization and accuracy of the grid connection process, avoiding dangerous situations such as asynchronous closing due to misoperation, and ensuring the stability and safety of the power supply in the entire distribution station area.

[0077] Furthermore, it also includes a status indicator LED;

[0078] The status indicator light LED is electrically connected to the synchronization control component 3 and the power supply component K1 respectively.

[0079] As can be seen from the above description, the status indicator LEDs are connected to the synchronization control unit 3 and the power supply unit K1, providing real-time and intuitive information on the operating status of each component of the system. By using different colors and flashing frequencies, personnel can quickly determine whether the power supply unit K1 is drawing power from the grid or the generator, and understand whether the synchronization control unit 3 is operating normally, performing synchronization calculations, or making adjustments. Furthermore, if an abnormality occurs in the system, such as a power outage, a failure of the synchronization control unit 3, or failure to meet grid connection requirements, the status indicator LEDs can provide a warning through specific lighting changes.

[0080] Furthermore, it also includes a communication component 4;

[0081] The generator control terminal of the synchronization control component 3 is connected to the power generation equipment 2 in the distribution station area through the communication component 4.

[0082] As can be seen from the above description, communication component 4 has excellent compatibility and supports multiple communication protocols, such as Ethernet, RS-485, and wireless communications (4G / 5G, WiFi, etc.). This allows for seamless integration with various types and brands of power generation equipment 2 in distribution substations, as well as other power system equipment. This enables the flexible access and access device for distribution substations to adapt to diverse application scenarios, enhancing the system's versatility.

[0083] Please refer to Figure 1 , the first embodiment of the present utility model is:

[0084] A flexible access and exit device for a distribution station area based on dual synchronization technology includes a device housing 1 and a synchronization control component 3, a power supply component K1, a communication component 4, an opening and closing switch component K2, a grid-side terminal J1, and a generation-side terminal J2 for connecting to a power generation equipment 2 in the distribution station area, located inside the device housing 1; the grid-side terminal J1 is electrically connected to the generation-side terminal J2 through the opening and closing switch component K2, the grid voltage detection end and the grid current detection end of the synchronization control component 3 are both electrically connected to the grid-side terminal J1, the generation voltage detection end of the synchronization control component 3 is electrically connected to the generation-side terminal J2, and the opening and closing control end of the synchronization control component 3 is electrically connected to the opening and closing switch component K2; the generator control end of the synchronization control component 3 is used for communication connection to the power generation equipment 2 in the distribution station area, and the power supply component K1 is electrically connected to the synchronization control component 3; the synchronization control component 3 is used to perform synchronization judgment through the voltage signals monitored by the grid voltage detection end and the generation voltage detection end, and to close the circuit by controlling the opening and closing switch component K2 after the synchronization conditions are met.

[0085] The synchronous closing process includes two steps: one is forward synchronization, which is when the maintenance begins, after the power generation equipment in the distribution area is started, the generator car is adjusted to synchronize with the mains power grid; the other is reverse synchronization, which is when the maintenance is completed, before the power generation equipment in the distribution area is disconnected, the generator car is adjusted to synchronize with the mains power grid.

[0086] The synchronization control component calculates the output power of the power generation vehicle through the voltage and current measured by the grid voltage detection terminal and the grid current detection terminal, and compares it with the load power. After the forward synchronization is completed, the output power of the power generation vehicle is adjusted to reach the first preset adjustment range before the mains power is disconnected; after the reverse synchronization is completed, the output power of the power generation vehicle is adjusted to reach the second preset adjustment range before the power generation vehicle is disconnected. The load power can be configured by a fixed value or collected by the communication component. The calculation of the output power of the power generation vehicle and the adjustment of the output power of the power generation vehicle to the first preset adjustment range or the second preset adjustment range can be achieved by existing algorithms. The first preset adjustment range is 70%-90% of the load power, preferably 80%, and the second preset adjustment range is 10%-30% of the load power, preferably 20%.

[0087] In this embodiment, combined with Figure 1 As shown in FIG, the operation process of a flexible access and exit device for a distribution area based on double synchronization technology is as follows:

[0088] During a grid connection and disconnection process, first, the grid voltage detection terminals VA1 / VB1 / VC1 / VN1 of the synchronization control component 3 collect the three-phase voltage of the grid and the grid current detection terminals IA / IB / IC collect the three-phase current of the grid. The power generation voltage detection terminals VA2 / VB2 / VC2 / VN2 of the synchronization control component 3 collect the output voltage of the power generation equipment 2 in the distribution station area, such as the power generation vehicle. Based on this, the synchronization data between the grid and the power generation equipment 2 in the distribution station area is calculated to determine whether the synchronization conditions are met. If the synchronization conditions are met, the opening and closing switches are controlled to close, and the power generation equipment 2 in the distribution station area is now connected to the grid and operated.

[0089] Then, prepare for off-grid operation; monitor the output power of the power generation equipment 2 in the distribution station area. If it is lower than 80% of the load power, increase the output power of the power generation equipment 2 in the distribution station area until it can independently meet the load requirements of the load; at this time, disconnect the grid switch to allow the power generation equipment 2 in the distribution station area to operate off-grid.

[0090] It is understandable that judging synchronization conditions based on voltage and current data and using software control to increase the output power of the power generation equipment 2 in the distribution station area are both achievable by existing algorithms. Those skilled in the art know how to use these algorithms to achieve corresponding functions, so they will not be elaborated here.

[0091] In this embodiment, the power supply component K1 includes a power supply switching switch; the first input end of the power supply switching switch is electrically connected to the grid side terminal J1, and the second input end of the power supply switching switch is electrically connected to the power generation side terminal J2; the output end of the power supply switching switch is also electrically connected to the synchronization control component 3.

[0092] like Figure 1 As shown, the power supply transfer switch simultaneously receives the grid voltage on both sides of the opening and closing switch assembly K2 and the output voltage of the power generation equipment 2 in the distribution station area. When voltage is present on either side, it outputs power to provide working power to the synchronization control assembly 3 and other components. The synchronization control assembly 3 includes L and N power terminals for connecting to the output end of the power supply transfer switch.

[0093] In this embodiment, a control button assembly is also included; the control button assembly includes a power button K3, a power generation stop button K4, a power generation start button K5 and a synchronous closing button K6; the power button K3 is electrically connected to the power supply assembly K1, and the synchronous control assembly 3 has 4 inputs IN1~IN4, which are respectively connected to the status contacts of the opening and closing switch assembly K2, the power generation stop button K4, the power generation start button K5 and the synchronous closing button K6.

[0094] In addition, synchronization control component 3 includes seven outputs, OUT1 through OUT7. OUT1 through OUT5 control status LED displays, while OUT6 and OUT7 control opening and closing. Different status LEDs can be used to indicate the closing of generator 2 in the distribution area, the closing of the opening and closing switch assembly K2, the opening of the opening and closing switch assembly K2, the grid-side power-on indication, and the generator-side power-on indication.

[0095] like Figure 1 As shown, the generator control terminal of the synchronization control component 3 is connected to the power generation equipment 2 in the distribution area through the communication component 4. The communication mode of the communication component 4 and the communication interface of the power generation equipment 2 in the distribution area can be selected from CAN, RS-485, DOPWM, etc.

[0096] Please refer to Figure 2 , the second embodiment of the present utility model is:

[0097] A flexible access and exit device for a distribution substation based on dual synchronization technology. Based on the aforementioned first embodiment, the synchronization control component 3 includes a main control module 31, a measurement module 32, a synchronization calculation module 33, an input / output module 35, a human-machine interface module 36, a load adjustment module 37, and a synchronization adjustment module 34. The main control module 31 is electrically connected to the synchronization calculation module 33, the synchronization adjustment module 34, the power supply component K1, and the opening / closing switch component K2. The synchronization calculation module 33 is electrically connected to the measurement module 32, with the grid voltage detection terminal, the grid current detection terminal, and the power generation voltage detection terminal all located on the measurement module 32. The synchronization calculation module 33 is electrically connected to the synchronization adjustment module 34, and the synchronization adjustment module 34 is communicatively connected to the power generation equipment 2 in the distribution substation. The main control module 31 is electrically connected to the input / output module 35, which is in turn electrically connected to the opening / closing switch component K2. The main control module 31 is electrically connected to the human-machine interface module 36, which is used to connect to an external touch display device. The main control module 31 is electrically connected to the load adjustment module 37 , and the load adjustment module 37 is communicatively connected to the power generation equipment 2 in the power distribution station area.

[0098] In this embodiment, each module of the synchronization control component 3 is described as follows:

[0099] 1. The measurement module 32 is used to calculate the voltage difference, phase difference and frequency difference between the power grid and the power generation terminal in real time and send them to the synchronous calculation module 33; Figure 1 As shown, based on VA1 / VB1 / VC1 / VN1, VA2 / VB2 / VC2 / VN2, IA / IB / IC, the grid-side voltage U1, frequency f1, frequency change rate df1 / dt, phase θ1, the generator-side voltage U2, frequency f2, frequency change rate df2 / dt, phase θ2, and the generator output active power P1 are calculated.

[0100] 2. Synchronous calculation module 33 : Calculates the synchronous data between the grid side and the power generation side, including the current voltage difference ΔU, the current frequency difference Δf, and the phase difference Δθ at the closing time, determines whether the synchronous conditions are met, and outputs the results to the main control module 31 .

[0101] 3. Main control module 31. It issues corresponding instructions according to the power stop button K4, power start button K5, and synchronous closing button K6, executes the corresponding control logic, and sends the control commands to the synchronous adjustment module 34, load adjustment module 37, and input and output module 35 for execution.

[0102] 4. Synchronous adjustment module 34: Receives the synchronous adjustment instruction issued by the main control module 31, and adjusts the generator frequency and voltage so that the current voltage difference, current frequency difference, and closing time phase difference calculated synchronously meet the target requirements.

[0103] V. Load Regulation Module 37. Based on the generator output power control requirements of the main control module 31 and the real-time power measurements of the measurement module 32, the generator frequency is adjusted until the active power output reaches the target value. Load Regulation Module 37 includes two functions: forward load regulation and reverse load regulation. When the forward load regulation function is triggered, the power generation equipment in the distribution area is controlled to output within a first preset regulation range; when the reverse load regulation function is triggered, the power generation equipment in the distribution area is controlled to output within a second preset regulation range.

[0104] 6. Generator control module: Receives frequency and voltage regulation commands from the synchronization and load regulation module 37, and controls the generator to execute speed-up, speed-down, voltage-up, and voltage-down operations.

[0105] 7. Open-in and open-out module 35: Receives and executes the opening and closing commands and status indicator LED operation commands from the main control module 31, and feeds back the status of each control button to the main control module 31.

[0106] 8. Human-machine interface module 36. Detects the key status of the LCD panel and sends commands to the main control module 31 to execute operations; at the same time, the LCD panel displays the switch status and synchronization status of the main control module 31 in real time.

[0107] In this embodiment, the main control module 31 of the synchronous control component receives the command sent by the control button component and performs the control operation. When the synchronous closing button signal is received, it is first determined whether the current forward synchronization or reverse synchronization is being executed, and then the adjustment command is sent to the synchronous adjustment module 34 for synchronous adjustment. If the output power of the power generation vehicle is less than the second preset adjustment range, forward synchronization is executed; if the output power of the power generation vehicle is greater than the first preset adjustment range, reverse synchronization is executed. After receiving the adjustment command, the synchronous adjustment module 34 controls the power generation equipment in the distribution station area to adjust the frequency and voltage until the synchronization conditions are met. After the synchronous adjustment is completed, the load adjustment is further performed. Among them, the forward synchronization performs the forward load adjustment, and the reverse synchronization performs the reverse load adjustment function. Taking the power generation equipment 2 in the distribution station area as a generator, and the opening and closing switch component K2 is preferably a circuit breaker as an example, the specific process of the main control module 31 executing forward synchronous closing, generator off-grid, reverse synchronous closing, and generator shutdown is:

[0108] First, before maintenance begins, a forward synchronous closing command is executed. The synchronization data ΔU, Δf, and Δθ are evaluated. If the synchronization conditions are not met, a synchronization adjustment command is sent to the synchronization adjustment module 34. Once the synchronization conditions are met, the circuit breaker is closed, and the generator is now connected to the grid.

[0109] Next, the generator is commanded to disconnect from the grid. The generator output power is monitored in real time. If it falls below 80% of the load power, a command is sent to the load regulation module 37 to gradually increase the generator output load to the desired value. Once the regulation is complete, the grid switch is disconnected, and the generator now supplies power to the loads on the grid alone.

[0110] After the inspection is complete, a reverse synchronous closing command is executed. The synchronization data ΔU, Δf, and Δθ between the generator and the mains are checked. If the synchronization conditions are not met, a synchronization adjustment command is sent to the synchronization adjustment module 34. If the synchronization conditions are met, the circuit breaker is closed, and the generator and the grid are connected again.

[0111] Finally, the generator shutdown command is executed. At this time, a command is sent to the load regulation module 37 to reduce the generator output load to below 20%, transferring the load to the grid power supply; then the mains switch is closed, the generator is stopped, and the circuit breaker is opened.

[0112] In addition, after the main control module 31 issues the generator boost and speed increase command, it simultaneously starts the overvoltage and overfrequency protection to avoid problems such as excessive voltage causing burning of electrical equipment and excessive frequency causing generator runaway.

[0113] In summary, the utility model provides a flexible access and exit device for a distribution substation based on dual synchronization technology, which connects the grid-side terminals and the power supply output terminals of the power generation equipment in the distribution substation respectively, and switches the grid-connected state and the off-grid state of the power generation equipment in the distribution substation through the opening and closing switch components; before the power generation equipment in the distribution substation is connected to the grid or is off-grid, the synchronization control component collects the voltage on the grid side, the voltage on the power generation side and the current on the grid side to determine whether the synchronization conditions are met, and whether it is forward synchronization or reverse synchronization, it can dynamically adjust the output load of the power generation equipment in the distribution substation according to the current load power, ensure a smooth transition during the generator input and exit process, avoid anomalies caused by sudden load changes, realize seamless load transfer during the generator input and exit process, and improve the safety and stability of residents' electricity use during the maintenance process. The synchronization control component is divided into a main control module, a measurement module, a synchronization calculation module, and a synchronization adjustment module. Each module functions independently. If a module fails, it can be quickly located and repaired or replaced independently, eliminating the need for a large-scale overhaul of the entire synchronization control component, reducing maintenance costs and time. Based on the synchronization calculation module's calculation results, the synchronization adjustment module communicates with the power generation equipment in the distribution station area, adjusting the power generation equipment's output in real time to ensure that its voltage, frequency, and phase are consistent with those of the grid. The measurement module collects grid-side voltage and current, as well as generator-side voltage, providing accurate data for synchronization calculations. Based on this data, the synchronization calculation module accurately calculates parameters such as the voltage, frequency, and phase difference between the grid and the power generation equipment in the distribution station area, providing a basis for subsequent adjustments. This clearly defined division of labor between measurement and calculation improves the accuracy of synchronization judgments, ensuring that power generation equipment in the distribution station area meets strict synchronization requirements for both on-grid and off-grid operation.

[0114] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the description and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A flexible access and exit device for distribution area based on dual synchronization technology, characterized in that: It includes a device housing and a synchronization control component, a power supply component, an opening and closing switch component, a grid-side terminal, and a power generation side terminal for connecting to power generation equipment in a distribution station area. The grid-side terminal is electrically connected to the power generation side terminal through the opening and closing switch assembly, the grid voltage detection terminal and the grid current detection terminal of the synchronization control assembly are both electrically connected to the grid-side terminal, the power generation voltage detection terminal of the synchronization control assembly is electrically connected to the power generation side terminal, and the opening and closing control terminal of the synchronization control assembly is electrically connected to the opening and closing switch assembly; The generator control terminal of the synchronization control component is used to communicate with the power generation equipment in the distribution station area, and the power supply component is electrically connected to the synchronization control component. The synchronization control component is used to perform synchronization judgment based on the voltage signals monitored by the grid voltage detection terminal and the power generation voltage detection terminal, and control the opening and closing switch component to close the circuit breaker after the synchronization conditions are met; The synchronization control component is also used to calculate the output power of the power generation vehicle through the voltage and current measured by the grid voltage detection terminal and the grid current detection terminal, and compare it with the load power. After the forward synchronization is completed, the output power of the power generation vehicle is adjusted to reach a first preset adjustment range before the mains power is disconnected. After the reverse synchronization is completed, the output power of the power generation vehicle is adjusted to reach a second preset adjustment range before the power generation vehicle is disconnected. The power supply component includes a power supply switch; The first input end of the power supply switch is electrically connected to the grid-side terminal, and the second input end of the power supply switch is electrically connected to the power generation-side terminal; The output end of the power supply switching switch is electrically connected to the synchronization control component, and the power supply switching switch is used to automatically switch to the other end after power is lost at either end of the grid side terminal or the power generation side terminal.

2. According to claim 1, a flexible access and exit device for a distribution station area based on dual synchronization technology is characterized in that: The synchronization control component includes a main control module, a measurement module, a synchronization calculation module and a synchronization adjustment module; The main control module is electrically connected to the synchronization calculation module, the synchronization adjustment module, the power supply component and the opening and closing switch component respectively; The synchronization calculation module is electrically connected to the measurement module, and the grid voltage detection terminal, the grid current detection terminal and the power generation voltage detection terminal are all located on the measurement module; The synchronization calculation module is electrically connected to the synchronization adjustment module, and the synchronization adjustment module is communicatively connected to the power generation equipment in the distribution station area; The measurement module is used to calculate the voltage difference, phase difference and frequency difference between the power grid and the power generation end in real time, and send them to the synchronization calculation module. The synchronization calculation module is used to determine whether the synchronization conditions are met and output the results to the main control module.

3. The flexible access and exit device for distribution area based on dual synchronization technology according to claim 2 is characterized in that: The synchronous control component also includes an input and output module; The main control module is electrically connected to the opening and closing switch assembly through the opening and closing module.

4. The flexible access and exit device for distribution area based on dual synchronization technology according to claim 2 is characterized in that: The synchronous control component also includes a human-machine interface module; The main control module is electrically connected to the human-machine interface module, and the human-machine interface module is used to connect to an external touch display device.

5. The flexible access and exit device for distribution area based on dual synchronization technology according to claim 2 is characterized in that: The synchronous control component also includes a load adjustment module; The main control module is electrically connected to the load adjustment module, and the load adjustment module is communicatively connected to the power generation equipment in the distribution station area; The load regulation module is used to provide forward load regulation and reverse load regulation: when the forward load regulation function is triggered, the power generation equipment in the distribution area is controlled to output a first preset regulation range; when the reverse regulation function is triggered, the power generation equipment in the distribution area is controlled to output a second preset regulation range.

6. The flexible access and exit device for distribution area based on dual synchronization technology according to claim 1 is characterized in that: Also included is a control button assembly; The control button assembly is electrically connected to the synchronization control assembly and the power supply assembly respectively.

7. The flexible access and exit device for distribution area based on double synchronization technology according to claim 6 is characterized in that: The control button assembly includes a power button, a power stop button, a power start button and a synchronous closing button; The power button is electrically connected to the power supply component, and the synchronization control component is electrically connected to the power generation stop button, the power generation start button and the synchronization closing button respectively.

8. The flexible access and exit device for distribution area based on double synchronization technology according to claim 1 is characterized in that: Also includes status indicator lights; The status indicator lights are electrically connected to the synchronization control component and the power supply component respectively.

9. The flexible access and exit device for distribution area based on double synchronization technology according to claim 1 is characterized in that: Also included are communication components; The generator control terminal of the synchronization control component is connected to the power generation equipment in the distribution station area through the communication component.

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