Flexible regulation and control method and device for Internet surfing with surplus electricity, computer equipment and storage medium

Abstract

The invention relates to the technical field of distributed photovoltaic power generation regulation and control realized by an intelligent Internet of Things electric energy meter, and discloses a flexible regulation and control method and device for surfing the Internet by residual electricity, computer equipment and a storage medium, which are applied to a flexible regulation and control system, and the flexible regulation and control system comprises a photovoltaic inverter; the method comprises the following steps: acquiring property right demarcation point power and power generation metering point power; calculating a generated power difference value based on the property right demarcation point power and a preset generated power control parameter; calculating a power generation side real-time power control limit value based on the power generation power difference value and the power generation metering point power; and carrying out flexible regulation and control on the generated power of the photovoltaic inverter based on the real-time power control limit value of the power generation side. According to the invention, flexible regulation and control during group regulation and group control of the transformer area photovoltaic inverters in a photovoltaic power generation surplus power grid mode are realized, the regulation and control accuracy during group regulation and group control of the photovoltaic inverters is improved, and the safety and stable operation of a power grid are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of distributed photovoltaic power generation control implemented by intelligent IoT electric energy meters, and in particular to a flexible control method, device, computer equipment and storage medium for connecting surplus power to the grid. Background Art

[0002] We are currently vigorously promoting the transformation from "dual control" of energy consumption to "dual control" of total carbon emissions and intensity, improving the incentive and constraint policies for pollution reduction and carbon reduction, and accelerating the formation of a green production and lifestyle; actively serving the strategic goals of "carbon peak and carbon neutrality", and adapting to the development needs of new power systems with new energy as the main body, and promoting the high-quality development of low-voltage distributed photovoltaics as guidance. In accordance with the principles of "minimum abandoned light, fairness in people's livelihood, incentive priority, precision and efficiency", we will give full play to the existing resource advantages of the electricity information collection system and explore the models and technical routes for low-voltage distributed photovoltaics to participate in grid regulation.

[0003] Relevant regulations require that large-scale photovoltaic power generation be equipped with a certain proportion of energy storage devices, while there are no mandatory energy storage requirements for industrial, commercial, and household photovoltaic systems. However, the widespread integration of distributed photovoltaic power generation into the grid has raised grid security concerns, necessitating regulation. When surplus photovoltaic power is connected to the grid, the overall group regulation and control of the substation (the area where one or more transformers supply power to users)—for example, when regulating power generation at property boundary points—can lead to inaccurate regulation. Summary of the Invention

[0004] In view of this, the present invention provides a flexible control method, device, computer equipment and storage medium for surplus power grid connection to solve the problem of inaccurate control when group adjustment and control are carried out in substations for the surplus power grid connection of photovoltaic power generation.

[0005] In a first aspect, the present invention provides a flexible control method for surplus power grid connection, which is applied to a flexible control system including a photovoltaic inverter. The method comprises:

[0006] Obtain the power at the property demarcation point and the power at the power generation metering point;

[0007] Calculate the power generation difference based on the property rights demarcation point power and the preset power generation control parameters;

[0008] Calculate the real-time power control limit on the power generation side based on the power difference and the power at the power metering point;

[0009] The power generation power of the photovoltaic inverter is flexibly regulated based on the real-time power control limit on the power generation side.

[0010] The flexible control method for surplus power access to the grid provided by the present invention simultaneously collects the power of the property boundary point and the power generation metering point and calculates the real-time power control limit on the power generation side, and uses the real-time power control limit on the power generation side as the control coefficient to flexibly control the photovoltaic inverter, thereby realizing flexible control of the photovoltaic inverters in the photovoltaic power generation surplus power access to the grid when performing group adjustment and control, improving the accuracy of the control when performing group adjustment and control of the photovoltaic inverters, ensuring the safety and stable operation of the power grid, and solving the problem of inaccurate control when performing group adjustment and control in the photovoltaic power generation surplus power access to the grid.

[0011] In an optional embodiment, the flexible control system further includes an IoT electric energy meter, which is installed at the property demarcation point and the power generation metering point respectively. Obtaining the power at the property demarcation point and the power at the power generation metering point includes:

[0012] The power of the IoT electric energy meter at the property rights demarcation point is collected as the power at the property rights demarcation point;

[0013] The power of the IoT electric energy meter at the power generation metering point is collected as the power of the power generation metering point.

[0014] The flexible control method for surplus power grid access provided by the present invention collects the property right demarcation point power and the power of the power generation metering point through the Internet of Things electric energy meter, so that the collected property right demarcation point power and the power of the power generation metering point are accurate and reliable, providing conditions for the subsequent calculation of the control coefficient of the real-time power control limit on the power generation side.

[0015] In an optional embodiment, the formula for calculating the power generation difference based on the property right demarcation point power and the preset power generation control parameter is as follows:

[0016] ΔE=E0+E1;

[0017] Among them, ΔE is the power generation difference, E0 is the preset power generation control parameter, and E1 is the property rights demarcation point power.

[0018] In an optional embodiment, the formula for calculating the real-time power control limit on the power generation side based on the power generation power difference and the power at the power generation metering point is as follows:

[0019] E=|E2+ΔE|;

[0020] Among them, E is the real-time power control limit on the power generation side, and E2 is the power at the power generation metering point.

[0021] The flexible control method for surplus power grid access provided by the present invention calculates the power generation difference by the power at the property boundary point and the preset power generation control parameters, and calculates the real-time power control limit on the power generation side based on the power generation difference and the power at the power generation metering point, thereby realizing accurate calculation of the real-time power control limit on the power generation side and providing conditions for subsequent flexible control of the photovoltaic inverter.

[0022] In an optional embodiment, the flexibly regulating the power generation of the photovoltaic inverter based on the real-time power control limit on the power generation side includes:

[0023] When the power generation power of the photovoltaic inverter is less than or equal to the real-time power control limit of the power generation side, the power generation power of the photovoltaic inverter is regulated in real time based on the real-time power control limit of the power generation side;

[0024] When the real-time power control limit on the power generation side is equal to the preset power threshold, the power generation power of the photovoltaic inverter is time-controlled based on the power at the power generation metering point.

[0025] The flexible control method for surplus power grid access provided by the present invention uses the real-time power control limit value of the power generation side as the control coefficient to perform real-time or time-period control on the photovoltaic inverter, thereby avoiding the power generation imbalance of the photovoltaic inverter, and controlling the power generation of the photovoltaic inverter on the power generation side in real time to ensure the maximization of the power generation, thereby improving the accuracy of the photovoltaic inverter in controlling the power generation.

[0026] In an optional embodiment, the flexible control system further includes a data interaction module, the data interaction module is connected to the photovoltaic inverter, and the flexible control method for surplus power grid connection further includes:

[0027] When the power generated by the photovoltaic power station is greater than the real-time power control limit on the power generation side, the flexible control is determined to have failed;

[0028] When flexible regulation fails, the IoT electricity meter at the power generation metering point sends a control command to reduce the power generation to the photovoltaic inverter through the data interaction module or performs rigid regulation on the photovoltaic inverter.

[0029] The flexible control method for surplus power grid access provided by the present invention, when flexible control fails, the Internet of Things electric energy meter at the power generation metering point sends a control command to reduce the power generation to the photovoltaic inverter through the data interaction module, or performs rigid control on the photovoltaic inverter, monitors the power generation of the photovoltaic inverter in real time, and rigidly controls the photovoltaic inverter to prevent excessive power generation, thereby ensuring the safety of the power grid.

[0030] In an optional embodiment, the flexible control system further includes a photovoltaic circuit breaker and a master station; the photovoltaic circuit breaker is connected to the photovoltaic inverter;

[0031] Rigid regulation of photovoltaic inverters includes:

[0032] Disconnect the photovoltaic circuit breaker from the photovoltaic inverter to trip the photovoltaic inverter, and report the photovoltaic inverter tripping situation to the master station through the IoT electricity meter at the power generation metering point and the IoT electricity meter at the property boundary point in turn.

[0033] The flexible control method for surplus power grid access provided by the present invention disconnects the photovoltaic circuit breaker from the photovoltaic inverter to trip the photovoltaic inverter, and reports the photovoltaic inverter tripping situation to the main station through the Internet of Things electricity meter at the power generation metering point and the Internet of Things electricity meter at the property boundary point in turn, thereby realizing rigid control and enabling the main station to timely dispatch and control the power generation situation and timely optimize the power generation power of the power grid.

[0034] In a second aspect, the present invention provides a flexible control device for connecting surplus power to the grid, which is applied to a flexible control system including a photovoltaic inverter. The device includes:

[0035] Power acquisition module, used to obtain the power at the property boundary point and the power at the power generation metering point;

[0036] A difference calculation module is used to calculate the difference in generated power based on the power at the property right demarcation point and the preset generated power control parameters;

[0037] A limit calculation module is used to calculate the real-time power control limit on the power generation side based on the power difference and the power at the power metering point;

[0038] The flexible control module is used to flexibly control the power generation of the photovoltaic inverter based on the real-time power control limit on the power generation side.

[0039] In a third aspect, the present invention provides a computer device comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to execute the flexible control method for surplus power access to the grid according to the first aspect or any corresponding embodiment thereof.

[0040] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the flexible control method for surplus power access to the grid according to the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. 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.

[0042] Figure 1 1 is a flow chart of a flexible control method for surplus power grid connection according to an embodiment of the present invention;

[0043] Figure 2is a flow chart of another method for flexible control of surplus power grid access according to an embodiment of the present invention;

[0044] Figure 3 1 is a flow chart of another flexible control method for surplus power grid connection according to an embodiment of the present invention;

[0045] Figure 4 is a topological diagram of a flexible control system according to an embodiment of the present invention;

[0046] Figure 5 2 is a structural block diagram of a flexible control device for surplus power grid connection according to an embodiment of the present invention;

[0047] Figure 6 Schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. Surplus power to the grid means that the electricity generated by the photovoltaic power generation system is used for its own use first. When the electricity is not enough to meet its own needs, it is supplemented by the power grid; and the excess electricity can be sold to the power grid. This model can not only meet the electricity needs of users, but also sell excess electricity to the power grid, bringing additional benefits.

[0049] The working principle of the surplus power grid-connected mode is that the electricity generated by the photovoltaic power generation system is first used by the users themselves. If the power generation is not enough to meet the user's needs, the power grid will supplement the power supply. When the power generation exceeds the user's needs, the excess power can be sold to the grid. In this mode, two meters are usually required for measurement: one meter is used to measure the amount of electricity generated by photovoltaics, and the other is a two-way meter used to measure the amount of electricity in the upstream and downstream of the grid. The meters can all be IoT smart meters. For the surplus power grid-connected mode of photovoltaic power generation, when the overall group adjustment and group control of the substation is carried out, such as regulating the power generation at the property boundary point, there is a problem of inaccurate regulation. For example Figure 4 As shown, the embodiment of the present invention adopts a flexible control system to realize the photovoltaic group adjustment and control in the substation area, and 4G Internet of Things meters are installed at the property boundary point and the power generation metering point.

[0050] An embodiment of the present invention provides a flexible control method for the grid connection of surplus power. By simultaneously collecting the power of the property right demarcation point and the power generation metering point and calculating the dispatch coefficient, the photovoltaic inverter is flexibly controlled to achieve the effect of precise control when regulating power generation at the property right demarcation point.

[0051] According to an embodiment of the present invention, an embodiment of a flexible control method for surplus power grid access is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0052] In this embodiment, a flexible control method for surplus power grid connection is provided, which can be used in a flexible control system, such as Figure 4 As shown, the flexible control system includes photovoltaic inverters, Figure 1 Flowchart of the flexible control method for surplus power grid connection according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0053] Step S101: Obtain the power at the property boundary point and the power at the power generation metering point.

[0054] Specifically, the property demarcation point refers to the point where the maintenance and management scope of electrical equipment between the power supply department and the user is divided based on ownership. The power generation metering point is the gateway between the customer and the power company or utility. It measures power consumption and serves as the primary basis for electricity bill assessment. The power at the property demarcation point and the power generation metering point can be collected using IoT electricity meters.

[0055] Step S102: Calculate the power generation difference based on the property right demarcation point power and the preset power generation control parameter.

[0056] Specifically, the preset power control parameter, also known as the power control power or rated power, refers to the maximum power the generator can continuously output at rated speed and rated voltage. The power difference is calculated by dividing the power at the property right demarcation point by the preset power control parameter.

[0057] Step S103: Calculate the real-time power control limit value on the power generation side based on the power generation power difference and the power at the power generation metering point.

[0058] Specifically, the real-time power control limit on the generator side refers to the maximum real-time power generated by the PV inverter on the generator side. The real-time power control limit on the generator side is calculated based on the generated power difference and the power at the power metering point.

[0059] Step S104 , flexibly regulating the power generation of the photovoltaic inverter based on the real-time power control limit on the power generation side.

[0060] Specifically, flexible regulation refers to adjusting the power generated by the photovoltaic inverter through flexible measures, such as adjusting generator output, controlling loads, and adjusting transmission lines, to maintain stable operation of the photovoltaic inverter's power generation. Flexible regulation of the photovoltaic inverter's power generation is based on the real-time power control limit on the power generation side. For example, when the photovoltaic inverter's power generation is less than or equal to the real-time power control limit on the power generation side, a real-time regulation strategy is implemented for the photovoltaic inverter's power generation. When the real-time power control limit on the power generation side issued by the upper-level master station is 0, the real-time regulation strategy becomes ineffective and the system switches to time-based regulation of the electricity meter at the power generation meter point.

[0061] The flexible control method for surplus power grid connection provided in this embodiment simultaneously collects the power of the property boundary point and the power generation metering point and calculates the real-time power control limit on the power generation side, and uses the real-time power control limit on the power generation side as the control coefficient to flexibly control the photovoltaic inverter, thereby realizing flexible control of the photovoltaic inverters in the photovoltaic power generation surplus power grid connection method during group adjustment and control, improving the accuracy of the control when performing group adjustment and control of the photovoltaic inverters, ensuring the safety and stable operation of the power grid, and solving the problem of inaccurate control when performing group adjustment and control in the photovoltaic power generation surplus power grid connection method.

[0062] In this embodiment, a flexible control method for surplus power grid connection is provided, which can be used in a flexible control system. Figure 2 Flowchart of the flexible control method for surplus power grid connection according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps:

[0063] Step S201: Obtain the power at the property boundary point and the power at the power generation metering point.

[0064] Specifically, if Figure 4 As shown, the flexible control system also includes an IoT electric energy meter, which is installed at the property boundary point and the power generation metering point respectively. The IoT electric energy meter is a 4G IoT electric energy meter. The above step S201 includes:

[0065] Step S2011: collecting the power of the IoT electric energy meter at the property rights demarcation point as the property rights demarcation point power.

[0066] Specifically, the power of the IoT electric energy meter installed at the property demarcation point is collected as the property demarcation point power.

[0067] Step S2012: collecting the power of the IoT electric energy meter at the power generation metering point as the power of the power generation metering point.

[0068] Specifically, the power of the IoT electric energy meter installed at the power generation metering point is collected as the power of the power generation metering point.

[0069] The superior master station obtains instantaneous quantities such as the power at the property boundary point and the power at the power generation metering point of all photovoltaic power generation users in the substation area through the 4G network.

[0070] Step S202 : calculating the power generation difference based on the property right demarcation point power and the preset power generation control parameter.

[0071] Specifically, the formula for calculating the power generation difference based on the property rights demarcation point power and the preset power generation control parameters is as follows:

[0072] ΔE=E0+E1;

[0073] Among them, ΔE is the power generation difference, E0 is the preset power generation control parameter, and E1 is the property rights demarcation point power.

[0074] Step S203: Calculate the real-time power control limit value on the power generation side based on the power generation power difference and the power at the power generation metering point.

[0075] Specifically, the formula for calculating the real-time power control limit on the power generation side based on the power generation difference and the power at the power generation metering point is as follows:

[0076] E=|E2+ΔE|;

[0077] Where E is the real-time power control limit on the power generation side, and E2 is the power at the power metering point. If the preset power generation control parameter E0 = 10kW, the following examples are used to calculate the control power under different power generation conditions:

[0078] Example 1: E1=-15kW, E2=+50kW;

[0079] ΔE=10+(-15)=-5kW;

[0080] E=|+50+(-5)|=45kW.

[0081] Example 2: E1=-9kW, E2=+50kW;

[0082] ΔE=10+(-9)=1kW;

[0083] E=|+50+1|=51kW.

[0084] Example 3: E1 = +25kW, E2 = +50kW;

[0085] ΔE=10+(+25)=35kW;

[0086] E=|+50+35|=85kW.

[0087] Step S204: flexibly control the power generation of the photovoltaic inverter based on the real-time power control limit of the power generation side. Figure 1 Step S104 of the illustrated embodiment will not be described in detail here.

[0088] The flexible control method for surplus power grid access provided in this embodiment uses IoT electricity meters to collect power at the property demarcation point and power at the power generation metering point. This ensures that the collected power at the property demarcation point and power at the power generation metering point are accurate and reliable, facilitating the subsequent calculation of the control coefficient for the real-time power control limit on the generator side. The generated power difference is calculated by comparing the power at the property demarcation point with preset generated power control parameters, and the real-time power control limit on the generator side is calculated based on the generated power difference and the power at the power generation metering point. This enables accurate calculation of the real-time power control limit on the generator side, facilitating the subsequent flexible control of the photovoltaic inverter.

[0089] In this embodiment, a flexible control method for surplus power grid connection is provided, which can be used in a flexible control system. Figure 3 Flowchart of the flexible control method for surplus power grid connection according to an embodiment of the present invention. Figure 3 As shown, the process includes the following steps:

[0090] Step S301: Obtain the power at the property boundary point and the power at the power generation metering point. Figure 2 Step S201 of the illustrated embodiment will not be described in detail here.

[0091] Step S302: Calculate the power difference based on the power at the property right demarcation point and the preset power control parameters. Figure 2 Step S202 of the illustrated embodiment will not be described in detail here.

[0092] Step S303: Calculate the real-time power control limit value on the power generation side based on the power difference and the power at the power metering point. Figure 2 Step S203 of the illustrated embodiment will not be described in detail here.

[0093] Step S304: flexibly adjust the power generation of the photovoltaic inverter based on the real-time power control limit on the power generation side.

[0094] Specifically, the above step S304 includes:

[0095] Step S3041: When the power generation power of the photovoltaic inverter is less than or equal to the power generation side real-time power control limit, the power generation power of the photovoltaic inverter is regulated in real time based on the power generation side real-time power control limit.

[0096] Specifically, the upper master station sends the real-time power control limit of the power generation side to the IoT electricity meter on the power generation side, that is, the IoT electricity meter at the power generation metering point, and adjusts the power generation power of the photovoltaic inverter to not exceed the real-time power control limit of the power generation side, that is, the power generation power of the photovoltaic inverter is adjusted in real time based on the real-time power control limit of the power generation side.

[0097] Step S3042: When the real-time power control limit value on the power generation side is equal to the preset power threshold, the power generation power of the photovoltaic inverter is time-controlled based on the power at the power generation metering point.

[0098] Specifically, the preset power threshold of this embodiment is set to 0. When the real-time power control limit of the power generation side issued by the upper master station is 0, the real-time regulation fails and is converted to the time period regulation of the IoT electric energy meter at the power generation metering point. That is, the power generation power of the photovoltaic inverter is time-regulated based on the power generation metering point power, so that the power generation power of the photovoltaic inverter is not greater than the power at the power generation metering point.

[0099] like Figure 4 As shown, the flexible control system also includes a data interaction module, which is connected to the photovoltaic inverter.

[0100] Step S305: When the power generated by the photovoltaic power station is greater than the real-time power control limit on the power generation side, it is determined that the flexible control has failed. When the flexible control fails, the IoT electric energy meter at the power generation metering point sends a control command to reduce the power generation to the photovoltaic inverter through the data interaction module, or performs rigid control on the photovoltaic inverter.

[0101] Specifically, the flexible control system further includes a photovoltaic circuit breaker and a master station; the photovoltaic circuit breaker is connected to a photovoltaic inverter; the photovoltaic circuit breaker adopts a photovoltaic Bluetooth circuit breaker, and the above step S305 includes:

[0102] Step a. Disconnect the PV circuit breaker from the PV inverter to trip the PV inverter, and report the PV inverter tripping to the master station via the IoT energy meter at the power generation metering point and the IoT energy meter at the property boundary point. Specifically, when flexible control fails, rigid control (state control) is performed, specifically: the power generation of the PV inverter is detected, and the IoT energy meter at the power generation metering point sends a control command to the PV inverter to reduce the power generation through the data interaction module. If the power limit of the time period (i.e., the power of the power generation metering point) is exceeded, the IoT energy meter controls the PV Bluetooth circuit breaker to trip and reports it to the upper-level master station.

[0103] This embodiment provides a flexible control method for surplus power grid access. When flexible control fails, the IoT energy meter at the power generation metering point sends a control command to the photovoltaic inverter through the data interaction module to reduce the power generation, or performs rigid control on the photovoltaic inverter. The photovoltaic inverter's power generation is monitored in real time, and rigid control of the photovoltaic inverter prevents excessive power generation, ensuring grid safety. The photovoltaic circuit breaker is disconnected from the photovoltaic inverter to trip the photovoltaic inverter, and the photovoltaic inverter tripping is reported to the master station via the IoT energy meter at the power generation metering point and the IoT energy meter at the property boundary point, respectively. This allows the master station to promptly dispatch and control the power generation situation and optimize the grid's power generation.

[0104] As one or more specific application embodiments of the present invention, combined with Figure 4 The flexible control method for surplus power grid connection provided by the present invention is further described in detail as follows:

[0105] Considering that the load of industrial and commercial users is usually large and cannot be ignored, for the surplus power grid that accounts for 90% (such as Figure 4 As shown in the right box, the dispatching system needs to control the power generation at the property boundary point and the power generation metering point. This solution uses the master station, smart terminal, smart IoT power meter (including photovoltaic equipment data interaction module), photovoltaic Bluetooth smart circuit breaker, and photovoltaic inverter to realize photovoltaic group dispatching and control. The meters at the property boundary point and the power generation metering point are all equipped with 4G IoT power meters. Figure 4 In the left frame, when the full amount of grid connection is reached, all the power generated by the photovoltaic inverter is sold to the grid. This embodiment does not consider the full grid connection control situation of this part. Figure 4 In the right frame, the main station obtains the property boundary point power and power generation metering point power of all photovoltaic power generation users through a wireless private network, 4G network or Ethernet, and issues control commands for the photovoltaic inverter power generation power. The communication protocol of this embodiment adopts DL / T698.45. An IoT electricity meter or 20 electricity meter (20A electricity meter) is installed at the property boundary point. This IoT electricity meter or 20 electricity meter includes a 4G communication module. The IoT electricity meter at the property boundary point is respectively connected to the user load (smart terminal) and the IoT electricity meter at the power generation metering point. The IoT electricity meter at the power generation metering point, the photovoltaic Bluetooth circuit breaker and the photovoltaic inverter are connected in sequence, and the photovoltaic inverter is connected to the household photovoltaic. The IoT electricity meter at the power generation metering point is also connected to the photovoltaic inverter via the RS485 bus. The IoT electricity meter at the power generation metering point includes a 4G communication module and a data interaction module. The specific implementation steps of the flexible control method for surplus power access to the grid are as follows:

[0106] 1) The master station obtains instantaneous quantities such as the property boundary power E1 (signed number, negative in reverse) and the power metering point power E2 of all photovoltaic power users in the substation area through the 4G network.

[0107] 2) The master station calculates the power generation power and the real-time power control limit of each photovoltaic power generation user based on the daily power generation plan of all photovoltaic power generation users.

[0108] First, the power generation difference is calculated, which is ΔE = the power generation control parameter of the user period (denoted as E0, a positive number) + E1. Then, the real-time power control limit on the power generation side is calculated as E = |reverse power of the power generation metering point + ΔE|.

[0109] 3) The master station sends the real-time power control limit E of the power generation side to the IoT energy meter at the power generation metering point through the 4G network.

[0110] 4) The IoT energy meter at the power generation metering point issues commands through the data interaction module to control the power generation of the photovoltaic inverter and achieve flexible regulation. Flexible regulation includes:

[0111] The real-time power control limit E on the power generation side is sent to the IoT electric energy meter at the power generation metering point, and the photovoltaic inverter power generation power is regulated by the IoT electric energy meter at the power generation metering point to be no greater than E.

[0112] When the real-time power control limit on the power generation side is equal to the preset power threshold of 0, the real-time regulation becomes invalid and is converted to the time period regulation of the IoT electricity meter at the power generation metering point, that is, the power generation power of the photovoltaic inverter is time-regulated based on the power at the power generation metering point.

[0113] 5) When the PV power station's generated power exceeds the real-time power control limit on the power generation side, flexible control is deemed to have failed. If flexible control fails, rigid control (state control) is implemented: the PV inverter's generated power is detected, and the IoT energy meter at the power generation metering point sends a power reduction control command to the PV inverter through the data interaction module. If the power exceeds the time period limit (i.e., the power at the power generation metering point), the IoT energy meter controls the PV Bluetooth circuit breaker to trip and reports the event to the upper-level master station.

[0114] The flexible control method for surplus power access to the grid provided in this embodiment collects the power at the property boundary point and the power at the power generation metering point through the Internet of Things electricity meter, calculates the real-time power control limit on the power generation side, and uses the real-time power control limit on the power generation side as the control coefficient to flexibly control the photovoltaic inverter, thereby realizing flexible control of the photovoltaic inverters in the photovoltaic power generation surplus power access to the grid during group adjustment and group control, improving the control accuracy of the photovoltaic inverters during group adjustment and group control, disconnecting the photovoltaic circuit breaker from the photovoltaic inverter to trip the photovoltaic inverter, and reporting the photovoltaic inverter tripping situation to the main station through the Internet of Things electricity meter at the power generation metering point and the Internet of Things electricity meter at the property boundary point in turn, so that the main station can timely dispatch and control the power generation situation and timely optimize the power generation power of the power grid.

[0115] This embodiment also provides a flexible control device for accessing surplus power to the grid. This device is used to implement the above-mentioned embodiments and preferred implementations, and details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

[0116] This embodiment provides a flexible control device for surplus power grid connection, which is applied to a flexible control system. The flexible control system includes a photovoltaic inverter; Figure 5 Shown, including:

[0117] The power acquisition module 501 is used to acquire the power at the property boundary point and the power at the power generation metering point.

[0118] The difference calculation module 502 is used to calculate the power generation difference based on the property right demarcation point power and the preset power generation control parameter.

[0119] The limit calculation module 503 is used to calculate the real-time power control limit on the power generation side based on the power generation power difference and the power at the power generation metering point.

[0120] The flexible control module 504 is used to flexibly control the power generation of the photovoltaic inverter based on the real-time power control limit on the power generation side.

[0121] In some optional implementations, the flexible control system further includes an IoT electric energy meter, which is installed at the property boundary point and the power generation metering point respectively. The power acquisition module 501 includes:

[0122] The first collection unit is used to collect the power of the IoT electric energy meter at the property rights demarcation point as the property rights demarcation point power;

[0123] The second collection unit is used to collect the power of the IoT electric energy meter at the power generation metering point as the power of the power generation metering point.

[0124] In some optional implementations, the flexible control module 504 includes:

[0125] The real-time control unit is used to control the power generation of the photovoltaic inverter in real time based on the real-time power control limit of the power generation side when the power generation power of the photovoltaic inverter is less than or equal to the real-time power control limit of the power generation side.

[0126] The time period control unit is used to control the power generation power of the photovoltaic inverter based on the power at the power generation metering point when the real-time power control limit on the power generation side is equal to the preset power threshold.

[0127] In some optional implementations, the flexible control device for surplus power grid connection further includes:

[0128] The non-flexible control module is used to determine that the flexible control has failed when the power generated by the photovoltaic power station is greater than the real-time power control limit on the power generation side. When the flexible control fails, the IoT electricity meter at the power generation metering point sends a control command to reduce the power generation to the photovoltaic inverter through the data interaction module, or performs rigid control on the photovoltaic inverter.

[0129] In some optional embodiments, the flexible control system further includes a photovoltaic circuit breaker and a master station; the photovoltaic circuit breaker is connected to the photovoltaic inverter, and the non-flexible control module includes:

[0130] The rigid control unit is used to disconnect the photovoltaic circuit breaker from the photovoltaic inverter to trip the photovoltaic inverter, and report the photovoltaic inverter tripping situation to the main station through the IoT electricity meter at the power generation metering point and the IoT electricity meter at the property boundary point in turn.

[0131] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0132] The flexible control device for surplus power grid access in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0133] The embodiment of the present invention also provides a computer device having the above Figure 5 The flexible control device for surplus power grid connection shown.

[0134] See also Figure 6 , Figure 6 is a structural diagram of a computer device provided by an optional embodiment of the present invention, such as Figure 6 As shown, the computer device includes: one or more processors 10, memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components utilize different buses to communicate with each other and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in the memory or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Equally, multiple computer devices can be connected, and each device provides part of the necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 6 A processor 10 is taken as an example.

[0135] The processor 10 may be a central processing unit, a network processor, or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit, a programmable logic device, or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic, or any combination thereof.

[0136] The memory 20 stores instructions that can be executed by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiment.

[0137] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created based on the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely located relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0138] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0139] The computer device further includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30 and the output device 40 may be connected via a bus or other means. Figure 6 The bus connection is taken as an example.

[0140] The input device 30 can receive input digital or character information and generate key signal input related to user settings and function control of the computer device, such as a touch screen, a keypad, a mouse, a trackpad, a touch pad, an indicator stick, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 can include a display device, an auxiliary lighting device (e.g., an LED), and a tactile feedback device (e.g., a vibration motor). The above-mentioned display device includes but is not limited to a liquid crystal display, a light emitting diode, a display, and a plasma display. In some optional embodiments, the display device can be a touch screen.

[0141] The embodiment of the present invention also provides a computer-readable storage medium. The above-mentioned method according to the embodiment of the present invention can be implemented in hardware, firmware, or implemented as a computer code that can be recorded in a storage medium, or implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and downloaded through a network and will be stored in a local storage medium, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state drive, etc.; further, the storage medium can also include a combination of the above-mentioned types of memory. It can be understood that a computer, a processor, a microprocessor controller or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor or hardware, the method shown in the above embodiment is implemented.

[0142] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A flexible control method for surplus power grid connection, characterized in that: Applied to a flexible control system, the flexible control system includes a photovoltaic inverter; the method includes: Obtain the power at the property boundary point and the power at the power generation metering point; Calculate the power generation difference based on the property right demarcation point power and the preset power generation control parameter; Calculate the real-time power control limit value on the power generation side based on the power generation difference and the power at the power generation metering point; The power generation power of the photovoltaic inverter is flexibly regulated based on the real-time power control limit on the power generation side.

2. The method according to claim 1, characterized in that The flexible control system further includes an Internet of Things electric energy meter, which is installed at the property boundary point and the power generation metering point respectively. The acquisition of the power at the property boundary point and the power at the power generation metering point includes: The power of the IoT electric energy meter at the property rights demarcation point is collected as the power at the property rights demarcation point; The power of the IoT electric energy meter at the power generation metering point is collected as the power of the power generation metering point.

3. The method according to claim 1, characterized in that The formula for calculating the power difference based on the property demarcation point power and the preset power control parameters is as follows: ΔE=E0+E1; Among them, ΔE is the power generation difference, E0 is the preset power generation control parameter, and E1 is the property right dividing point power.

4. The method according to claim 3, characterized in that: The formula for calculating the real-time power control limit value on the power generation side based on the power generation difference and the power at the power generation metering point is as follows: E = |E2 + ΔE|; Among them, E is the real-time power control limit on the power generation side, and E2 is the power at the power generation metering point.

5. The method according to claim 1, characterized in that The flexibly regulating the power generation power of the photovoltaic inverter based on the real-time power control limit value of the power generation side includes: When the power generation power of the photovoltaic inverter is less than or equal to the real-time power control limit value of the power generation side, the power generation power of the photovoltaic inverter is controlled in real time based on the real-time power control limit value of the power generation side; When the real-time power control limit value of the power generation side is equal to the preset power threshold, the power generation power of the photovoltaic inverter is time-controlled based on the power at the power generation metering point.

6. The method according to claim 2, characterized in that The flexible control system further includes a data interaction module, and the data interaction module is connected to the photovoltaic inverter. The method further includes: When the power generated by the photovoltaic power station is greater than the real-time power control limit on the power generation side, it is determined that the flexible regulation has failed; When flexible regulation fails, the IoT energy meter at the power generation metering point sends a control command to reduce the power generation to the photovoltaic inverter through the data interaction module or performs rigid regulation on the photovoltaic inverter.

7. The method according to claim 6, characterized in that The flexible control system further includes a photovoltaic circuit breaker and a master station; the photovoltaic circuit breaker is connected to the photovoltaic inverter; The rigid regulation of the photovoltaic inverter includes: The connection between the photovoltaic circuit breaker and the photovoltaic inverter is disconnected to trip the photovoltaic inverter, and the tripping of the photovoltaic inverter is reported to the main station through the IoT electric energy meter at the power generation metering point and the IoT electric energy meter at the property boundary point in turn.

8. A flexible control device for surplus power grid connection, characterized in that: Applicable to a flexible control system, the flexible control system includes a photovoltaic inverter; the device includes: A power acquisition module is used to acquire the power at the property boundary point and the power at the power generation metering point; A difference calculation module, used for calculating the power generation difference based on the property right demarcation point power and the preset power generation control parameter; A limit value calculation module, used for calculating the real-time power control limit value of the power generation side based on the power generation power difference and the power of the power generation metering point; The flexible control module is used to flexibly control the power generation of the photovoltaic inverter based on the real-time power control limit on the power generation side.

9. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the flexible control method for surplus power access to the grid as described in any one of claims 1 to 7 by executing the computer instructions.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the flexible control method for surplus power access to the grid as described in any one of claims 1 to 7.

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