A power supply control method and related device based on an intelligent edge gateway

Abstract

The application discloses a kind of based on intelligent edge gateway's table area power supply control method and related device, applied to include distributed photovoltaic system, distributed energy storage device, reactive power compensation device and intelligent edge gateway's table area power supply system, control method includes: obtaining table area grid-connected point voltage;When table area grid-connected point voltage does not exceed table area normal operation voltage upper limit but exceeds preset dead zone voltage range, adjust the reactive power of photovoltaic inverter in distributed photovoltaic system to dampen voltage fluctuation;When table area grid-connected point voltage exceeds table area normal operation voltage upper limit, determine the reactive power capacity of table area, and determine the sum of reactive power capacity of photovoltaic inverter, distributed energy storage device and reactive power compensation device;According to the size relationship of table area reactive power capacity and reactive power capacity sum, photovoltaic inverter, distributed energy storage device and reactive power compensation device are adjusted and controlled according to the set adjustment priority.The purpose of the application is to solve the problem of low level of awareness, insufficient collaborative operation capability and repeated investment.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supply for substations, and in particular relates to a power supply control method for substations based on an intelligent edge gateway and related devices. Background Art

[0002] With the global emphasis on and promotion of renewable energy, household photovoltaic power generation, as a key component of distributed energy, has seen rapid growth in both installed capacity and the number of units connected to low-voltage distribution networks. While this trend has effectively promoted the utilization of clean energy, it has also brought with it a series of power quality issues. Winter, peak season for electricity consumption, sees a significant increase in residential and commercial electricity loads. However, photovoltaic power generation, affected by weather factors, exhibits significant intermittent and uncertain output. This mismatch between supply and demand leads to random fluctuations in the three-phase load in the substation, which in turn causes power quality issues such as high and low voltages and overloaded distribution transformers. For substations with numerous important users and stringent power supply quality requirements, these issues not only impact the normal operation of user equipment but can also cause economic losses and social impacts. Therefore, ensuring high-quality power supply control in the substation is crucial.

[0003] Current power supply control solutions for low-voltage substations often rely on a single type of power supply control device, such as a static VAR generator (SVG) for reactive power regulation and a voltage regulator for voltage adjustment. While these traditional devices can alleviate some power quality issues, they fail to consider unified power supply control across substations, resulting in insufficient awareness and coordination, and potentially duplication of investment in implementation. Summary of the Invention

[0004] In response to the problems existing in the prior art, the present invention provides a substation power supply control method and related devices based on an intelligent edge gateway, which aims to solve the problems of low perception level, insufficient collaborative operation capability and repeated investment.

[0005] In order to solve the above technical problems, the present invention is implemented through the following technical solutions:

[0006] According to a first aspect of the present invention, a method for controlling power supply in a substation area based on an intelligent edge gateway is provided, which is applied to a substation area power supply system including a distributed photovoltaic system, a distributed energy storage device, a reactive power compensation device, and an intelligent edge gateway. The control method includes:

[0007] Get the voltage of the grid connection point in the substation area;

[0008] When the grid-connected point voltage of the substation does not exceed the upper limit of the normal operating voltage of the substation but exceeds the preset dead zone voltage range, adjusting the reactive power of the photovoltaic inverter in the distributed photovoltaic system to smooth the voltage fluctuation;

[0009] When the grid connection point voltage of the substation exceeds the upper limit of the normal operating voltage of the substation, determining the reactive capacity of the substation, and determining the sum of the reactive capacities of the photovoltaic inverter, the distributed energy storage device and the reactive compensation device;

[0010] According to the relationship between the reactive capacity of the substation and the sum of the reactive capacities, the photovoltaic inverter, the distributed energy storage device and the reactive compensation device are regulated and controlled according to the set regulation priority.

[0011] In a possible implementation of the first aspect, regulating and controlling the photovoltaic inverter, the distributed energy storage device, and the reactive power compensation device according to the set regulation priority includes:

[0012] When the sum of the reactive capacities is greater than the reactive capacity of the substation, the reactive compensation device is preferentially controlled to perform voltage regulation;

[0013] If the grid connection point voltage of the substation area returns to the normal operating voltage of the substation area, the regulation is stopped;

[0014] If the grid-connected point voltage of the substation area has not recovered to the normal operating voltage of the substation area, the voltage is regulated by adjusting the reactive power of the photovoltaic inverter;

[0015] If the grid connection point voltage of the substation area returns to the normal operating voltage of the substation area, the regulation is stopped;

[0016] If the voltage at the grid-connected point in the substation has not recovered to the normal operating voltage of the substation, voltage regulation is performed by adjusting the reactive power of the distributed energy storage device until the voltage at the grid-connected point in the substation recovers to the normal operating voltage of the substation.

[0017] In a possible implementation of the first aspect, regulating and controlling the photovoltaic inverter, the distributed energy storage device, and the reactive power compensation device according to the set regulation priority includes:

[0018] When the sum of the reactive capacities is not greater than the reactive capacity of the substation and the sum of the reactive capacities has been exhausted, voltage regulation is performed by adjusting the active power of the distributed energy storage device;

[0019] If the grid connection point voltage of the substation area returns to the normal operating voltage of the substation area, the regulation is stopped;

[0020] If the voltage at the grid-connected point in the substation has not recovered to the normal operating voltage of the substation, the active power of the photovoltaic inverter is reduced or the distributed photovoltaic system is controlled to exit operation until the voltage at the grid-connected point in the substation recovers to the normal operating voltage of the substation.

[0021] In a possible implementation of the first aspect, after obtaining the grid connection point voltage of the substation area, the method further includes:

[0022] When the grid-connected point voltage of the substation does not exceed the upper limit of the normal operating voltage of the substation and does not exceed the preset dead zone voltage range, no adjustment is performed.

[0023] In a possible implementation of the first aspect, the determination of the reactive capacity of the substation area is specifically as follows:

[0024] The reactive capacity of the substation is determined based on the voltage deviation degree between the grid connection point voltage of the substation and the normal operating voltage of the substation, as well as the voltage sensitivity.

[0025] In a possible implementation of the first aspect, adjusting the reactive power of the photovoltaic inverter specifically includes:

[0026] The reactive power of photovoltaic inverter is regulated using constant power factor-reactive power droop control strategy.

[0027] In a possible implementation of the first aspect, the dead zone voltage range is pre-set based on historical data of the substation voltage, grid operation specifications, and safety standards.

[0028] According to a second aspect of the present invention, a power supply control device for a substation area based on an intelligent edge gateway is provided, which is applied to a substation area power supply system including a distributed photovoltaic system, a distributed energy storage device, a reactive power compensation device, and an intelligent edge gateway. The control device includes:

[0029] Acquisition module, used to obtain the voltage of the grid connection point in the substation area;

[0030] A first regulating module is configured to regulate the reactive power of the photovoltaic inverter in the distributed photovoltaic system to smooth out voltage fluctuations when the grid connection point voltage of the substation area does not exceed the upper limit of the normal operating voltage of the substation area but exceeds a preset dead zone voltage range;

[0031] A determination module, configured to determine the reactive capacity of the substation when the grid connection point voltage of the substation exceeds the upper limit of the normal operating voltage of the substation, and determine the sum of the reactive capacities of the photovoltaic inverter, the distributed energy storage device, and the reactive compensation device;

[0032] The second regulating module is used to regulate and control the photovoltaic inverter, the distributed energy storage device and the reactive compensation device according to the set regulation priority based on the size relationship between the reactive capacity of the substation and the sum of the reactive capacity.

[0033] According to a third aspect of the present invention, a device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the method for controlling power supply of a substation based on an intelligent edge gateway are implemented.

[0034] According to a fourth aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for controlling power supply of an area based on an intelligent edge gateway are implemented.

[0035] Compared with the prior art, the present invention has at least the following beneficial effects:

[0036] The present invention provides a power supply control method for a substation area based on an intelligent edge gateway. By integrating a distributed photovoltaic system, a distributed energy storage device, a reactive compensation device, and an intelligent edge gateway, when the voltage at the substation grid connection point does not exceed the substation normal operating voltage upper limit but exceeds a preset dead zone voltage range, the reactive power of the photovoltaic inverter in the distributed photovoltaic system is adjusted to smooth voltage fluctuations; when the voltage at the substation grid connection point exceeds the substation normal operating voltage upper limit, the substation reactive capacity is determined, and the sum of the reactive capacities of the photovoltaic inverter, distributed energy storage device, and reactive compensation device is determined; based on the relationship between the substation reactive capacity and the sum of the reactive capacities, the photovoltaic inverter, distributed energy storage device, and reactive compensation device are adjusted and controlled according to the set adjustment priority. Compared with traditional single-type power supply control, the present invention can more comprehensively and accurately perceive the power status of the substation area and perform coordinated control, thereby improving the overall control capability and response speed of the substation power supply system. In traditional solutions, various power supply control devices may lead to duplicate investment due to lack of unified coordination. The present invention realizes centralized monitoring and coordinated control of various devices through the intelligent edge gateway, avoiding redundancy and waste between devices, thereby optimizing investment costs. At the same time, since it can more accurately match the actual needs of the substation for regulation, the utilization rate and economic benefits of the equipment are improved.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the specific embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1A flowchart of a power supply control method for a transformer area based on an intelligent edge gateway is provided in an embodiment of the present application.

[0040] Figure 2 A schematic diagram of a bidirectional energy storage DC-DC Buck mode principle is provided in an embodiment of the present application.

[0041] Figure 3 A schematic diagram of a bidirectional energy storage DC-DC Boost mode principle is provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0043] In conjunction with Figure 1 The embodiments of the present application provide a power supply control method for a transformer area based on an intelligent edge gateway, which aims to realize comprehensive optimization and collaborative control of a transformer area power supply system containing a distributed photovoltaic system, a distributed energy storage device, a reactive power compensation device, and an intelligent edge gateway through integrated and intelligent means. For example, the method is applied to a typical low-voltage distribution transformer area, which contains a number of residential and commercial users, as well as a distributed photovoltaic system, a distributed energy storage device (such as a battery energy storage system), a reactive power compensation device (such as a static var compensator SVG), and an intelligent edge gateway.

[0044] It should be understood that the distributed photovoltaic system is configured with a photovoltaic array and a photovoltaic inverter, and the photovoltaic inverter needs to have reactive power regulation capability and can adjust reactive power output according to control instructions. The distributed energy storage device has bidirectional charging and discharging capability and supports reactive power regulation at the same time. The reactive power compensation device is used to quickly respond to system reactive power demand and provide continuous adjustable reactive power compensation.

[0045] The power supply control method for a transformer area based on an intelligent edge gateway specifically includes the following steps:

[0046] S1, obtaining the voltage of a transformer area grid connection point.

[0047] Specifically, the voltage value of the transformer area grid connection point is monitored in real time through a voltage sensor, and it is determined whether it is within the normal operating voltage range of the transformer area and the preset dead zone voltage range.

[0048] S2, when the voltage of the transformer area grid connection point does not exceed the upper limit of the normal operating voltage but exceeds the preset dead zone voltage range, adjusting the reactive power of the photovoltaic inverter in the distributed photovoltaic system to suppress voltage fluctuation.

[0049] Specifically, when the voltage at the grid-connected point in the substation does not exceed the upper limit of the substation's normal operating voltage but exceeds the preset deadband voltage range, the intelligent edge gateway first calculates the amount of reactive power that needs to be adjusted. It then sends instructions to the photovoltaic inverters in the distributed photovoltaic system to adjust their reactive power output to smooth out voltage fluctuations. During this phase, voltage regulation primarily utilizes the photovoltaic inverter's fast response capability.

[0050] S3. When the grid-connected point voltage of the substation exceeds the upper limit of the normal operating voltage of the substation, determine the reactive capacity of the substation and determine the sum of the reactive capacities of the photovoltaic inverter, the distributed energy storage device and the reactive compensation device.

[0051] Specifically, when the grid-connected voltage exceeds the upper limit of the substation's normal operating voltage, the intelligent edge gateway first calculates the substation's current required reactive capacity. It then evaluates the currently available reactive capacity of the PV inverter, distributed energy storage device, and reactive power compensation device, and calculates the sum of the three.

[0052] S4. According to the relationship between the reactive capacity of the substation and the sum of the reactive capacities, the photovoltaic inverter, the distributed energy storage device and the reactive compensation device are regulated and controlled according to the set regulation priority.

[0053] Specifically, based on the assessment results, the intelligent edge gateway sends adjustment instructions to each device in sequence according to the preset adjustment priority. Through comprehensive regulation, the substation voltage is quickly restored to normal range, while the operating efficiency of each device is optimized to avoid unnecessary energy waste.

[0054] Through continuous data collection and analysis, the intelligent edge gateway continuously optimizes adjustment strategies to ensure optimal coordination between devices. This enables comprehensive monitoring and intelligent control of the power supply system in the substation area, effectively improving the quality of power supply and resolving issues such as low perception, insufficient coordination, and duplicated investment in traditional control solutions.

[0055] In one achievable manner, regarding regulating and controlling the photovoltaic inverter, the distributed energy storage device, and the reactive power compensation device according to the set regulation priority, the implementation methods include the following:

[0056] When the sum of the reactive capacities is greater than the reactive capacity of the substation, the reactive compensation device is preferentially controlled to perform voltage regulation;

[0057] If the grid connection point voltage of the substation area returns to the normal operating voltage of the substation area, the regulation is stopped;

[0058] If the grid-connected point voltage of the substation area has not recovered to the normal operating voltage of the substation area, the voltage is regulated by adjusting the reactive power of the photovoltaic inverter;

[0059] If the grid connection point voltage of the substation area returns to the normal operating voltage of the substation area, the regulation is stopped;

[0060] If the voltage at the grid-connected point in the substation has not recovered to the normal operating voltage of the substation, voltage regulation is performed by adjusting the reactive power of the distributed energy storage device until the voltage at the grid-connected point in the substation recovers to the normal operating voltage of the substation.

[0061] That is, when the intelligent edge gateway detects that the voltage at the grid connection point exceeds the upper limit of the normal operating voltage of the substation, and has determined the sum of the reactive capacity required by the substation and the reactive capacity currently available from each device, it will execute the regulation control strategy in the following priority order:

[0062] Step a: Prioritize control of reactive power compensation devices

[0063] If the calculated reactive capacity sum is greater than the required reactive capacity of the substation, it indicates that there is sufficient reactive power available in the system. In this case, the first step is to adjust the reactive power compensation device (such as SVG) to quickly respond and reduce the voltage at the substation's grid connection point.

[0064] The intelligent edge gateway sends adjustment instructions to the reactive power compensation device, gradually adjusting its reactive power output until it detects that the voltage at the substation's grid connection point begins to drop.

[0065] If the voltage at the grid connection point of the substation returns to the normal operating voltage range of the substation during the adjustment process, the adjustment of the reactive power compensation device will be stopped immediately and the current status monitoring will be maintained.

[0066] Step b: Adjust the reactive power of the PV inverter

[0067] If the voltage at the grid connection point in the substation has not returned to normal operating voltage after the reactive power compensation device adjustment in step a, the next adjustment step will be entered. At this point, the intelligent edge gateway will turn its attention to the photovoltaic inverter and use its reactive power regulation capability to assist in regulation.

[0068] The intelligent edge gateway sends regulation instructions to the photovoltaic inverter to adjust its working mode, increase or decrease reactive power output to further balance the reactive power demand in the substation area and promote voltage recovery.

[0069] Likewise, if the grid-connected point voltage in the substation returns to the normal operating voltage during this process, the regulation of the photovoltaic inverter is stopped.

[0070] Step c: Regulate the reactive power of distributed energy storage devices

[0071] If the first two steps fail to restore the grid connection point voltage to normal, the intelligent edge gateway will activate the reactive power regulation capability of the distributed energy storage device. The distributed energy storage device not only acts as an energy buffer but also helps stabilize the grid voltage by regulating reactive power.

[0072] The intelligent edge gateway sends specific reactive power regulation instructions to the distributed energy storage device, and uses the reactive power regulation function in its bidirectional charging and discharging characteristics to gradually adjust its reactive power output until the voltage at the grid connection point in the substation reaches the normal range.

[0073] During the entire regulation process, the intelligent edge gateway will continuously monitor the voltage at the substation and grid connection point to ensure that all regulation actions are stopped immediately once the voltage returns to the normal operating range to avoid overregulation or unnecessary energy consumption.

[0074] Through the above-mentioned specific implementation methods, the present invention realizes the refined and intelligent control of the substation power supply system, effectively improves the power supply quality and stability of the substation, and reduces the economic losses caused by power quality problems.

[0075] In one achievable manner, regarding regulating and controlling the photovoltaic inverter, the distributed energy storage device, and the reactive power compensation device according to the set regulation priority, the implementation further includes:

[0076] When the sum of the reactive capacities is not greater than the reactive capacity of the substation and the sum of the reactive capacities has been exhausted, voltage regulation is performed by adjusting the active power of the distributed energy storage device;

[0077] If the grid connection point voltage of the substation area returns to the normal operating voltage of the substation area, the regulation is stopped;

[0078] If the voltage at the grid-connected point in the substation has not recovered to the normal operating voltage of the substation, the active power of the photovoltaic inverter is reduced or the distributed photovoltaic system is controlled to exit operation until the voltage at the grid-connected point in the substation recovers to the normal operating voltage of the substation.

[0079] Specifically, when the intelligent edge gateway detects that the reactive capacity required by the substation is greater than or equal to the sum of the reactive capacities currently provided by the photovoltaic inverter, reactive compensation device, and distributed energy storage, and that the reactive regulation capabilities of these devices have been exhausted, the system faces a reactive resource shortage. However, if the voltage at the substation's grid connection point still deviates from the normal operating range, the intelligent edge gateway will consider adjusting the active power of the distributed energy storage device to regulate the voltage. The intelligent edge gateway evaluates the distributed energy storage device's current state of charge (SOC), charge and discharge capacity, and its impact on system stability. While ensuring the safe operation of the energy storage device, it adjusts its active power output (increasing or decreasing its supply to or absorption of the grid) to change the power balance of the substation grid and thereby regulate the voltage at the substation's grid connection point. During this regulation process, the intelligent edge gateway continuously monitors the substation's grid connection point voltage. Once the voltage returns to the normal operating range, it immediately stops regulating the active power of the distributed energy storage device and maintains the current state for continuous monitoring.

[0080] If the voltage at the grid connection point in the substation still fails to return to normal operating voltage after adjusting the active power of the distributed energy storage device, more aggressive measures are needed to balance the grid power. The intelligent edge gateway will then adjust the active power output of the PV inverter. The intelligent edge gateway sends adjustment instructions to the PV inverter, instructing it to gradually reduce its active power output. This process is gradual to avoid excessive impact on the grid. If the voltage still fails to recover after reducing the active power of the PV inverter, as a last resort, the intelligent edge gateway can control the complete or partial shutdown of the distributed PV system to completely eliminate the impact of its active power output on the grid voltage. While reducing the active power of the PV inverter or controlling the shutdown of the distributed PV system, the intelligent edge gateway continuously monitors the voltage at the grid connection point in the substation. Once the voltage returns to the normal operating range, further adjustment measures are immediately stopped and the system status is evaluated, with preparations to restore the normal operation of the PV inverter or reconnect the distributed PV system if necessary.

[0081] Preferably, after obtaining the voltage at the grid connection point of the substation, the method further comprises: when the voltage at the grid connection point of the substation does not exceed the upper limit of the normal operating voltage of the substation and does not exceed the preset dead zone voltage range, no adjustment is made. That is, after obtaining the voltage value, the intelligent edge gateway immediately compares it with the upper limit of the normal operating voltage of the substation and the preset dead zone voltage range. The preset dead zone voltage range is usually determined based on the characteristics of the substation power grid, the safe operating range of the equipment, and historical operation data, aiming to balance the accuracy of adjustment. If the voltage at the grid connection point of the substation does not exceed the upper limit of the normal operating voltage of the substation and is within the preset dead zone voltage range at the same time, the intelligent edge gateway will judge that the current voltage state is normal and no adjustment is needed. At this time, the system will maintain the current operating state and continue to monitor the voltage.

[0082] In one implementation, the determination of the reactive power capacity of the substation is based on the voltage deviation between the voltage at the grid connection point of the substation and the normal operating voltage of the substation, and the voltage sensitivity.

[0083] Specifically, the intelligent edge gateway first obtains the voltage at the grid connection point of the substation in real time, and compares it with the preset normal operating voltage range of the substation to calculate the current voltage deviation value. The voltage deviation value can be in the form of absolute value, indicating the difference between the actual voltage and the normal operating voltage center value; or in the form of relative value, such as percentage, indicating the deviation proportion. Voltage sensitivity refers to the sensitivity of the substation power grid to voltage changes, which is affected by many factors such as load characteristics, power grid structure, equipment performance, etc. The intelligent edge gateway can evaluate the voltage sensitivity of the current power grid based on historical data or expert experience. The substation with high voltage sensitivity may be greatly affected by the power grid operation even with small voltage deviation, so faster response and more accurate reactive power compensation are needed. According to the voltage deviation degree and the voltage sensitivity, the intelligent edge gateway uses fuzzy logic or lookup table method to calculate and determine the required reactive power capacity of the current substation.

[0084] Through the above implementation, the intelligent edge gateway can dynamically determine the required reactive power capacity of the substation according to the actual situation, and realize accurate control of the reactive power compensation device, thereby improving the voltage quality and power supply reliability of the substation power grid.

[0085] In one implementation, to optimize the reactive power balance of the substation grid and improve the voltage stability of the grid, the present embodiment proposes to use a constant power factor-reactive droop control strategy to regulate the reactive power output of the photovoltaic inverter. This control strategy combines the advantages of constant power factor control and reactive droop control. Constant power factor control can ensure that the photovoltaic inverter operates at a certain power factor, thereby controlling the ratio of active and reactive power. Reactive droop control is a method of automatically adjusting reactive power output according to changes in grid voltage, aimed at maintaining the stability of the grid voltage. The intelligent edge gateway can effectively regulate the reactive power output of the photovoltaic inverter using the constant power factor-reactive droop control strategy, thereby optimizing the reactive power balance and voltage stability of the grid.

[0086] Preferably, the dead zone voltage range is pre-set according to historical data of the substation voltage, grid operation specifications and safety standards. The dead zone voltage range is set to avoid the intelligent edge gateway from adjusting the substation voltage too frequently, reduce unnecessary operations, and improve the stability and efficiency of the system. By analyzing long-term monitoring data of the substation voltage, the fluctuation range, distribution law and extreme value conditions of the voltage can be understood. The intelligent edge gateway can automatically collect, process and analyze these data to identify the normal fluctuation interval and abnormal fluctuation of the voltage, and thus set a dead zone voltage range that can reflect the actual voltage situation and has a certain margin. The grid operation specifications usually include the allowed deviation range of the grid voltage, adjustment requirements and safety limits, etc. When setting the dead zone voltage range, the intelligent edge gateway needs to ensure that the range meets the requirements of the grid operation specifications to avoid conflicts with the grid operation rules. Safety standards are an important basis for ensuring the safe operation of the grid. When setting the dead zone voltage range, the safety operation requirements and voltage stability requirements of the grid equipment must be fully considered. By setting a reasonable dead zone voltage range, damage to the grid equipment caused by voltage fluctuations or the occurrence of grid instability phenomena can be avoided.

[0087] In a specific embodiment, an exemplary substation power supply control method based on an intelligent edge gateway adopts a "cloud-edge-end" Internet of Things architecture design, which is implemented as follows:

[0088] A distributed resource coordination and control app is deployed in the cloud. This app monitors the voltage at the photovoltaic grid-connected point in real time, receives data from the edge intelligent gateway, and generates control commands based on pre-set governance policies. These commands are then sent to the edge intelligent gateway via the cloud server. An edge intelligent gateway is deployed at the edge of the substation area, establishing communication links with distributed photovoltaic inverters, distributed energy storage devices, and refined reactive power compensation devices via LoRa wireless networking. The gateway incorporates multiple control strategy algorithms, such as AGC / AVC / PCS, for real-time analysis of grid-connected point voltage data and executes corresponding voltage regulation strategies based on control commands issued from the cloud. The distributed photovoltaic control system, integrated into the edge intelligent gateway, monitors and controls the photovoltaic inverters and energy storage devices, ensuring that all devices operate in accordance with established strategies. Distributed measurement and control terminals are deployed at the photovoltaic inverters, distributed energy storage devices, and refined reactive power compensation devices. By extending communication interfaces and configuring LoRa wireless data acquisition terminals, they enable four-way communication (telemetry, telesignaling, remote control, and remote regulation) with the edge intelligent gateway. These terminals collect device status data and upload it to the edge intelligent gateway, while also receiving and executing control commands from the gateway. The edge intelligent gateway obtains the voltage data of the substation and grid connection point in real time through the distributed measurement and control terminal, and uploads it to the cloud-based distributed resource coordination control APP.

[0089] When the grid-connected point voltage does not exceed the normal operating voltage limit but exceeds the preset deadband voltage range, the edge intelligent gateway first attempts to smooth out voltage fluctuations by adjusting the reactive power of the PV inverter. Specifically, it uses a constant power factor-reactive power droop or voltage-reactive power droop (variable droop) control strategy to automatically adjust the inverter's output reactive power based on voltage deviations.

[0090] If the voltage at the grid connection point in the substation area continues to exceed the upper limit of the normal operating voltage of the substation area, the edge intelligent gateway performs the following steps:

[0091] Determine the reactive capacity of the substation area, calculated based on the voltage deviation and voltage sensitivity. Calculate the sum of the reactive capacities of the PV inverter, distributed energy storage device, and refined reactive compensation device.

[0092] Based on the comparison of the sum of reactive capacities with the reactive capacity of the substation, voltage regulation is performed according to the set regulation priority: if the sum of reactive capacities is greater than the substation reactive capacity, the refined reactive compensation device is first controlled to regulate the voltage; if the voltage does not recover, the reactive power of the photovoltaic inverter and distributed energy storage device is adjusted in sequence until the voltage recovers. If the sum of reactive capacities is not greater than the substation reactive capacity and has been exhausted, voltage regulation is performed by adjusting the active power of the distributed energy storage device; if the voltage still cannot be restored, the active power of the photovoltaic inverter is reduced or the distributed photovoltaic system is controlled to stop operation.

[0093] Specifically, regarding the regulation of distributed energy storage devices: Figure 2 As shown in the figure, by controlling the bidirectional energy storage DC / DC converter, different control strategies can be used when the energy storage battery is charged / discharged to stabilize the DC side voltage of the inverter. u dc And assist the photovoltaic system to support the voltage. When the voltage at the photovoltaic grid point is too high and the reactive power cannot be adjusted, the energy storage battery is charged. At this time, the bidirectional energy storage DC / DC converter is in Buck mode, and the DC voltage is given u dcpre and u dc The difference after comparison is passed through the PI controller to obtain the input signal of the PWM generator.

[0094] like Figure 3 As shown in the figure, when the photovoltaic output power is not enough to support the voltage and the voltage in the substation is low, the energy storage battery discharges. At this time, the bidirectional energy storage DC / DC converter is in Boost mode, and the output power is given. Pref and output power P After making the difference, the PI controller is used to obtain the given value of the inductor current of the bidirectional energy storage DC / DC converter. I lref And with the inductor current of the bidirectional energy storage DC / DC converter I l The result is passed through the PI controller and used as the input signal of the PWM generator.

[0095] The control structure of the voltage outer loop and the current inner loop can achieve better dynamic performance than single-loop control, enabling the energy storage system to promptly smooth out fluctuations when the voltage exceeds the limit, thereby ensuring the stability of the substation voltage.

[0096] During any adjustment process, once the voltage at the substation's grid connection point returns to the normal operating range, the edge intelligent gateway immediately stops all adjustment operations to maintain system stability.

[0097] The distributed energy storage device grid-connected point installation has an obvious breaking point, and the breaking device can realize reliable grounding function, ensuring operation safety. The edge intelligent gateway and the distributed measurement and control terminal both have lightning protection and surge protection functions, improving the system safety protection capability. The edge intelligent gateway provides rich Internet of Things interfaces and IO interfaces, realizes massive terminal device access, provides open standard interfaces and open docking with industry application systems of different partners, and builds extensive industry practicality. Through the remote and cloud operation and maintenance platform, remote maintenance, upgrading and management of on-site devices are realized, improving system reliability and maintenance efficiency. Due to the non-uniform specification of photovoltaic inverters, the communication interface forms are various, and the communication interfaces adopted by different manufacturers include RS-485, USB, Ethernet, RS-232, etc., so it is necessary to convert them into a unified RS-485 port output through an interface converter. In addition, the RS-485 bus interface of part of the photovoltaic inverter has been occupied, and the interface converter needs to be used to expand the original 1-way communication to two-way, which realizes two-way data acquisition, control instruction issuing and the like without affecting the communication of the manufacturer's cloud platform. The photovoltaic inverter is connected with the communication interface converter to realize communication protocol conversion, and then connected with the intelligent gateway module to form a set of distributed measurement and control terminal product.

[0098] The embodiment is based on the modularization and compact research and development design of the edge intelligent gateway, can be applied to multiple types of scenes such as whole-county distributed photovoltaic and industrial park photovoltaic power station, and different functional modules can be flexibly selected and configured according to requirements. Based on the edge intelligent gateway, real-time and efficient data processing, operation and analysis are provided nearby, and multiple protocols are supported, the calculation system is more efficient and intelligent, and diversified control strategies can be flexibly configured. In the design process of the integrated solution, convenient debugging and maintenance in the later period are considered, remote configuration and debugging are supported, power failure alarm function is provided, and maintenance is efficient. Based on the integrated solution of the distributed energy storage device and the reactive power compensation device, the problem of high voltage overrun caused by the access of the distributed photovoltaic can be effectively solved.

[0099] In another embodiment of the present application, a smart edge gateway-based transformer area power supply control device is provided, which is applied to a transformer area power supply system including a distributed photovoltaic system, a distributed energy storage device, a reactive power compensation device and a smart edge gateway. The control device comprises:

[0100] The acquisition module is configured to acquire the voltage of the transformer area grid-connected point.

[0101] The first adjustment module is configured to adjust the reactive power of the photovoltaic inverter in the distributed photovoltaic system to suppress voltage fluctuation when the voltage of the transformer area grid-connected point does not exceed the upper limit of the normal operation voltage of the transformer area but exceeds the preset dead zone voltage range.

[0102] The determination module is used to determine the reactive capacity of the substation when the grid connection point voltage of the substation exceeds the upper limit of the normal operating voltage of the substation, and to determine the sum of the reactive capacities of the photovoltaic inverter, the distributed energy storage device and the reactive compensation device.

[0103] The second regulating module is used to regulate and control the photovoltaic inverter, the distributed energy storage device and the reactive compensation device according to the set regulation priority based on the size relationship between the reactive capacity of the substation and the sum of the reactive capacity.

[0104] Exemplarily, regulating and controlling the photovoltaic inverter, the distributed energy storage device, and the reactive power compensation device according to the set regulation priority includes:

[0105] When the sum of the reactive capacities is greater than the reactive capacity of the substation, the reactive compensation device is preferentially controlled to perform voltage regulation;

[0106] If the grid connection point voltage of the substation area returns to the normal operating voltage of the substation area, the regulation is stopped;

[0107] If the grid-connected point voltage of the substation area has not recovered to the normal operating voltage of the substation area, the voltage is regulated by adjusting the reactive power of the photovoltaic inverter;

[0108] If the grid connection point voltage of the substation area returns to the normal operating voltage of the substation area, the regulation is stopped;

[0109] If the voltage at the grid-connected point in the substation has not recovered to the normal operating voltage of the substation, voltage regulation is performed by adjusting the reactive power of the distributed energy storage device until the voltage at the grid-connected point in the substation recovers to the normal operating voltage of the substation.

[0110] Exemplarily, regulating and controlling the photovoltaic inverter, the distributed energy storage device, and the reactive power compensation device according to the set regulation priority includes:

[0111] When the sum of the reactive capacities is not greater than the reactive capacity of the substation and the sum of the reactive capacities has been exhausted, voltage regulation is performed by adjusting the active power of the distributed energy storage device;

[0112] If the grid connection point voltage of the substation area returns to the normal operating voltage of the substation area, the regulation is stopped;

[0113] If the voltage at the grid-connected point in the substation has not recovered to the normal operating voltage of the substation, the active power of the photovoltaic inverter is reduced or the distributed photovoltaic system is controlled to exit operation until the voltage at the grid-connected point in the substation recovers to the normal operating voltage of the substation.

[0114] All relevant contents of each step involved in the embodiment of the aforementioned method for controlling power supply to a substation based on an intelligent edge gateway can be referred to the functional description of the functional module corresponding to the device for controlling power supply to a substation based on an intelligent edge gateway in the embodiment of the present invention, and will not be repeated here. The division of modules in the embodiment of the present invention is schematic and is only a logical functional division. There may be other division methods in actual implementation. In addition, the functional modules in the various embodiments of the present invention may be integrated into one processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0115] In another embodiment of the present invention, a computer device is provided, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function; the processor described in the embodiment of the present invention can be used for the operation of a power supply control method for a substation based on an intelligent edge gateway.

[0116] In another embodiment of the present invention, a storage medium is provided, specifically a computer-readable storage medium (Memory). The computer-readable storage medium is a memory device in a computer device, used to store programs and data. It is understood that the computer-readable storage medium herein may include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, the storage space also stores one or more instructions suitable for being loaded and executed by a processor. These instructions may be one or more computer programs (including program code). It should be noted that the computer-readable storage medium herein may be a high-speed RAM memory or a non-volatile memory, such as at least one disk storage device. The processor may load and execute the one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the above-described embodiment of a method for controlling power supply to a substation area based on an intelligent edge gateway.

[0117] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0118] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0119] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 the function specified in the one or more blocks.

[0120] These computer program instructions can also be loaded into a computer or other programmable data processing devices, so that a series of operation steps are performed on the computer or other programmable devices to generate a computer-implemented process, thus the instructions executed on the computer or other programmable devices provide a process for implementing the flowchart Figure 1 the flowchart or flowcharts and / or a block Figure 1 the steps of the function specified in the one or more blocks.

[0121] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. mean that the specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In the description of the present application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples. In addition, the skilled person in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0122] Finally, it should be noted that the above-described embodiments are merely specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, but not to limit the same. The protection scope of the present application is not limited thereto, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features thereof, without departing from the technical scope disclosed by the present application; and these modifications, changes or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A power supply control method for a substation based on an intelligent edge gateway, characterized in that: Applied to a regional power supply system including a distributed photovoltaic system, a distributed energy storage device, a reactive power compensation device, and an intelligent edge gateway, the control method includes: Get the voltage of the grid connection point in the substation area; When the grid-connected point voltage of the substation does not exceed the upper limit of the normal operating voltage of the substation but exceeds the preset dead zone voltage range, adjusting the reactive power of the photovoltaic inverter in the distributed photovoltaic system to smooth the voltage fluctuation; When the grid connection point voltage of the substation exceeds the upper limit of the normal operating voltage of the substation, determining the reactive capacity of the substation, and determining the sum of the reactive capacities of the photovoltaic inverter, the distributed energy storage device and the reactive compensation device; According to the relationship between the reactive capacity of the substation area and the sum of the reactive capacities, the photovoltaic inverter, the distributed energy storage device and the reactive compensation device are regulated and controlled according to the set regulation priority, including: When the sum of the reactive capacities is greater than the reactive capacity of the substation, the reactive compensation device is preferentially controlled to perform voltage regulation; If the grid connection point voltage of the substation area returns to the normal operating voltage of the substation area, the regulation is stopped; If the grid-connected point voltage of the substation area has not recovered to the normal operating voltage of the substation area, the voltage is regulated by adjusting the reactive power of the photovoltaic inverter; If the grid connection point voltage of the substation area returns to the normal operating voltage of the substation area, the regulation is stopped; If the voltage at the grid-connected point in the substation area has not recovered to the normal operating voltage of the substation area, voltage regulation is performed by adjusting the reactive power of the distributed energy storage device until the voltage at the grid-connected point in the substation area recovers to the normal operating voltage of the substation area; When the sum of the reactive capacities is not greater than the reactive capacity of the substation and the sum of the reactive capacities has been exhausted, voltage regulation is performed by adjusting the active power of the distributed energy storage device; If the grid connection point voltage of the substation area returns to the normal operating voltage of the substation area, the regulation is stopped; If the voltage at the grid-connected point in the substation has not recovered to the normal operating voltage of the substation, the active power of the photovoltaic inverter is reduced or the distributed photovoltaic system is controlled to exit operation until the voltage at the grid-connected point in the substation recovers to the normal operating voltage of the substation.

2. The method for controlling power supply of a substation based on an intelligent edge gateway according to claim 1, wherein: After obtaining the grid connection point voltage of the substation area, the method further includes: When the grid-connected point voltage of the substation does not exceed the upper limit of the normal operating voltage of the substation and does not exceed the preset dead zone voltage range, no adjustment is performed.

3. The method for controlling power supply of a substation based on an intelligent edge gateway according to claim 1, wherein: The determination of the reactive capacity of the substation area is specifically as follows: The reactive capacity of the substation is determined based on the voltage deviation degree between the grid connection point voltage of the substation and the normal operating voltage of the substation, as well as the voltage sensitivity.

4. The method for controlling power supply of a substation based on an intelligent edge gateway according to claim 1, wherein: The regulating the reactive power of the photovoltaic inverter specifically includes: The reactive power of photovoltaic inverter is regulated using constant power factor-reactive power droop control strategy.

5. The method for controlling power supply of a substation based on an intelligent edge gateway according to claim 1, wherein: The dead zone voltage range is pre-set based on historical data of the substation voltage, grid operation specifications and safety standards.

6. A power supply control device for a substation based on an intelligent edge gateway, characterized in that: Applied to a regional power supply system that includes a distributed photovoltaic system, distributed energy storage devices, reactive power compensation devices, and intelligent edge gateways. The control device includes: Acquisition module, used to obtain the voltage of the grid connection point in the substation area; A first regulating module is configured to regulate the reactive power of the photovoltaic inverter in the distributed photovoltaic system to smooth out voltage fluctuations when the grid connection point voltage of the substation area does not exceed the upper limit of the normal operating voltage of the substation area but exceeds a preset dead zone voltage range; A determination module, configured to determine the reactive capacity of the substation when the grid connection point voltage of the substation exceeds the upper limit of the normal operating voltage of the substation, and determine the sum of the reactive capacities of the photovoltaic inverter, the distributed energy storage device, and the reactive compensation device; The second regulating module is configured to regulate and control the photovoltaic inverter, the distributed energy storage device, and the reactive compensation device according to a set regulation priority based on the relationship between the reactive capacity of the substation area and the sum of the reactive capacities, including: When the sum of the reactive capacities is greater than the reactive capacity of the substation, the reactive compensation device is preferentially controlled to perform voltage regulation; If the grid connection point voltage of the substation area returns to the normal operating voltage of the substation area, the regulation is stopped; If the grid-connected point voltage of the substation area has not recovered to the normal operating voltage of the substation area, the voltage is regulated by adjusting the reactive power of the photovoltaic inverter; If the grid connection point voltage of the substation area returns to the normal operating voltage of the substation area, the regulation is stopped; If the voltage at the grid-connected point in the substation area has not recovered to the normal operating voltage of the substation area, voltage regulation is performed by adjusting the reactive power of the distributed energy storage device until the voltage at the grid-connected point in the substation area recovers to the normal operating voltage of the substation area; When the sum of the reactive capacities is not greater than the reactive capacity of the substation and the sum of the reactive capacities has been exhausted, voltage regulation is performed by adjusting the active power of the distributed energy storage device; If the grid connection point voltage of the substation area returns to the normal operating voltage of the substation area, the regulation is stopped; If the voltage at the grid-connected point in the substation has not recovered to the normal operating voltage of the substation, the active power of the photovoltaic inverter is reduced or the distributed photovoltaic system is controlled to exit operation until the voltage at the grid-connected point in the substation recovers to the normal operating voltage of the substation.

7. A device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the substation power supply control method based on the intelligent edge gateway as described in any one of claims 1 to 5 are implemented.

8. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by the processor, the steps of the power supply control method for an area based on an intelligent edge gateway as described in any one of claims 1 to 5 are implemented.

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