Overvoltage regulation and control method and device and electronic equipment

Abstract

The embodiment of the invention provides an overvoltage regulation and control method and device and electronic equipment, and belongs to the technical field of power transmission and distribution. The method comprises the steps of controlling all inverters to perform reactive power absorption adjustment until the power factors of all inverters are reduced to a set threshold value under the condition that the existence of voltage over-limit is detected; acquiring a historical curve; the historical curve is obtained based on superposition of generation power-voltage curves of all grid connection points and electricity utilization power-voltage curves of all loads in the same historical time period; determining to-be-adjusted active power of all grid connection points based on the historical curve; and performing active power adjustment on all inverters based on the to-be-adjusted active power of all grid-connected points. The method is used for overcoming the defect that an existing master station regulation and control method and a regulation and control scheme of a control theory cannot achieve a good regulation and control effect.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power transmission and distribution, and in particular to an overvoltage regulation method, an overvoltage regulation device, an electronic device, a machine-readable storage medium and a computer program product. Background Art

[0002] At present, distributed photovoltaics are growing rapidly. Their volatility, unpredictability and power electronics have brought significant impacts to the existing power grid, which is mainly connected by inertial energy sources such as thermal power and hydropower. Among them, the biggest problem that harms electricity consumption to users on distribution lines is the problem of voltage exceeding the limit.

[0003] The existing technical solutions are mainly based on the master station control method and the control scheme of cybernetics (whoever exceeds the voltage limit controls who). However, unlike the backbone network, the distribution network is multifaceted and difficult to achieve precise control by issuing instructions manually. The one-size-fits-all method such as cybernetics rigid control has resulted in a large amount of power abandonment and waste, seriously damaging the interests of users. That is, the existing master station control method and the control scheme of cybernetics cannot achieve good control effects. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide an overvoltage control method, an overvoltage control device, an electronic device, a machine-readable storage medium and a computer program product to solve the defects that the existing master station control method and cybernetics control scheme cannot achieve good control effects.

[0005] In order to achieve the above object, an embodiment of the present invention provides an overvoltage control method, comprising:

[0006] When voltage over-limit is detected, all inverters are controlled to absorb reactive power until the power factor of all inverters drops to the set threshold;

[0007] Obtaining a historical curve; the historical curve is obtained by superimposing the power generation power-voltage curves of all grid-connected points and the power consumption power-voltage curves of all loads in the same historical period;

[0008] Determine the active power to be adjusted of all grid connection points based on the historical curve;

[0009] Active power of all inverters is adjusted based on the active power to be adjusted of all grid-connected points.

[0010] Optionally, controlling all inverters to absorb reactive power until the power factors of all inverters drop to a set threshold includes:

[0011] Repeat the following steps until the power factors of all inverters drop to the set threshold:

[0012] Control the power factor of all inverters to decrease according to the set ratio;

[0013] Get the power factor of all inverters.

[0014] Optionally, the historical curve is obtained by following the steps:

[0015] Obtain the power generation-voltage curves of all grid-connected points at the set power factor within the set historical period;

[0016] Obtaining the power consumption-voltage curves of all loads in the set historical period at the set power factor;

[0017] Determine the topological relationship between each grid connection point and the corresponding load;

[0018] Based on the topological relationship, the power generation power-voltage curve of each grid-connected point is subtracted from the power consumption power-voltage curve of the corresponding load to obtain the historical curve.

[0019] Optionally, the determining the active power to be adjusted of all grid-connected points based on the historical curve includes:

[0020] Calculate the target current based on the current generated power and the current over-limit voltage;

[0021] Determine from the historical curve the historical current that is closest to the target current when the first grid connection point does not exceed the set over-limit voltage threshold, and determine a first difference between the historical power generation power and the historical power consumption of all loads when the historical current occurs;

[0022] Obtaining a second difference between the current generated power and the current power consumption of all loads;

[0023] Calculating the difference between the first difference and the second difference to obtain the active power to be adjusted of the first grid connection point;

[0024] The first grid connection point is any grid connection point among all grid connection points.

[0025] Optionally, the performing active power adjustment on all inverters based on the active power to be adjusted of all grid-connected points includes:

[0026] Repeat the following steps until there are no voltage overlimits:

[0027] Calculate the inverter control conditions based on the set over-limit voltage threshold, the first grid connection point voltage, the transformer voltage in the substation area, and the number of inverters in the substation area;

[0028] When the voltage of the first grid-connected point is greater than the regulation condition of the inverter, summing the current active power of the inverter and the active power to be adjusted of the first grid-connected point;

[0029] In the case that the voltage is still over-limited, adjusting the active power to be adjusted of the first grid-connected point based on the first set ratio to obtain a first updated active power to be adjusted of the first grid-connected point;

[0030] summing the current active power of the inverter and the first updated active power to be adjusted;

[0031] The first grid connection point is any grid connection point among all grid connection points.

[0032] Optionally, the method further includes:

[0033] When the active power of the inverter is lower than the set active power threshold, the following steps are repeatedly performed until the active power of the inverter is greater than the set active power threshold:

[0034] Adjusting the active power to be adjusted of the first grid-connected point based on a second set ratio to obtain a second updated active power to be adjusted of the first grid-connected point;

[0035] Calculating the difference between the current active power of the inverter and the second updated active power to be adjusted;

[0036] The first grid connection point is any grid connection point among all grid connection points.

[0037] On the other hand, an embodiment of the present invention further provides an overvoltage control device, comprising:

[0038] The reactive power control module is used to control all inverters to absorb reactive power when voltage over-limit is detected, until the power factor of all inverters drops to a set threshold;

[0039] An acquisition module is used to acquire a historical curve; the historical curve is obtained by superimposing the power generation power-voltage curves of all grid-connected points and the power consumption power-voltage curves of all loads in the same historical period;

[0040] A determination module, used for determining the active power to be adjusted of all grid-connected points based on the historical curve;

[0041] The active power control module is used to adjust the active power of all inverters based on the active power to be adjusted of all grid-connected points.

[0042] Optionally, controlling all inverters to absorb reactive power until the power factors of all inverters drop to a set threshold value includes:

[0043] Repeat the following steps until the power factors of all inverters drop to the set threshold:

[0044] Control the power factor of all inverters to decrease according to the set ratio;

[0045] Get the power factor of all inverters.

[0046] Optionally, the historical curve is obtained by following the steps:

[0047] Obtain the power generation-voltage curves of all grid-connected points at the set power factor within the set historical period;

[0048] Obtaining the power consumption-voltage curves of all loads in the set historical period at the set power factor;

[0049] Determine the topological relationship between each grid connection point and the corresponding load;

[0050] Based on the topological relationship, the power generation power-voltage curve of each grid-connected point is subtracted from the power consumption power-voltage curve of the corresponding load to obtain the historical curve.

[0051] Optionally, the determining the active power to be adjusted of all grid-connected points based on the historical curve includes:

[0052] Calculate the target current based on the current generated power and the current over-limit voltage;

[0053] Determine from the historical curve the historical current that is closest to the target current when the first grid connection point does not exceed the set over-limit voltage threshold, and determine a first difference between the historical power generation power and the historical power consumption of all loads when the historical current occurs;

[0054] Obtaining a second difference between the current generated power and the current power consumption of all loads;

[0055] Calculating the difference between the first difference and the second difference to obtain the active power to be adjusted of the first grid connection point;

[0056] The first grid connection point is any grid connection point among all grid connection points.

[0057] Optionally, the performing active power adjustment on all inverters based on the active power to be adjusted of all grid-connected points includes:

[0058] Repeat the following steps until there are no voltage overlimits:

[0059] Calculate the inverter control conditions based on the set over-limit voltage threshold, the first grid connection point voltage, the transformer voltage in the substation area, and the number of inverters in the substation area;

[0060] When the voltage of the first grid-connected point is greater than the regulation condition of the inverter, summing the current active power of the inverter and the active power to be adjusted of the first grid-connected point;

[0061] In the case that the voltage is still over-limited, adjusting the active power to be adjusted of the first grid-connected point based on the first set ratio to obtain a first updated active power to be adjusted of the first grid-connected point;

[0062] summing the current active power of the inverter and the first updated active power to be adjusted;

[0063] The first grid connection point is any grid connection point among all grid connection points.

[0064] Optionally, the device further comprises:

[0065] A control module is used to repeatedly perform the following steps when the active power of the inverter is lower than a set active power threshold until the active power of the inverter is greater than the set active power threshold: adjusting the active power to be adjusted of the first grid-connected point based on a second set ratio to obtain a second updated active power to be adjusted of the first grid-connected point; and calculating the difference between the current active power of the inverter and the second updated active power to be adjusted; wherein the first grid-connected point is any grid-connected point among all grid-connected points.

[0066] On the other hand, the present invention further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned overvoltage control method when executing the program.

[0067] On the other hand, the present invention further provides a machine-readable storage medium having a computer program stored thereon, and the computer program implements the above-mentioned overvoltage control method when executed by a processor.

[0068] On the other hand, the present invention further provides a computer program product, comprising a computer program, wherein the computer program implements the above-mentioned overvoltage control method when executed by a processor.

[0069] Through the above technical scheme, the historical curve composed of power generation, power consumption and voltage of the present invention contains the relationship between on-site grid connection points, topological relationship and power generation and power consumption habits. Through historical curve regulation, the mutual influence of power regulation on line voltage can be avoided, and the effectiveness of regulation can be improved. In addition, the present invention comprehensively considers reactive power regulation and active power regulation to maximize power generation while ensuring the quality of power consumption. Therefore, the present invention ensures the safety of user power consumption and the safety of power grid areas, while ensuring the user's power generation income as much as possible and improving the regulation effect.

[0070] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0072] Figure 1 This is one of the flow charts of the overvoltage control method provided by the present invention;

[0073] Figure 2 It is a schematic diagram of the automated high voltage management and control framework for distribution station areas provided by the present invention;

[0074] Figure 3 This is the second flow chart of the overvoltage control method provided by the present invention;

[0075] Figure 4 It is a structural schematic diagram of the overvoltage control device provided by the present invention;

[0076] Figure 5 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0077] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0078] The existing technical solutions are mainly based on the main station control method and the control scheme of cybernetics (whoever exceeds the limit will be controlled). However, unlike the backbone network, the distribution network is multi-faceted and difficult to achieve precise control by issuing instructions manually. One-size-fits-all methods such as cybernetics rigid control have resulted in a large amount of power abandonment and waste, seriously damaging the interests of users. The voltage management of the distribution line in the substation is affected by many factors such as photovoltaic power generation, line length, power load, etc., which makes it difficult to predict. Each substation is different, and the existing method based on issuing fixed value control cannot be applied and the effect is poor.

[0079] In view of this, the purpose of the embodiments of the present invention is to provide an overvoltage control method, an overvoltage control device, an electronic device, a machine-readable storage medium and a computer program product to solve the defects that the existing master station control method and cybernetics control scheme cannot achieve good control effects.

[0080] Method Embodiment

[0081] Please refer to Figure 1 , an embodiment of the present invention provides an overvoltage control method, comprising:

[0082] Step 100: When voltage overlimit is detected, all inverters are controlled to absorb reactive power for regulation until the power factors of all inverters drop to a set threshold.

[0083] The overvoltage control method of the embodiment of the present invention can be applied to the automatic high voltage management and control framework of the distribution station area. Figure 2 , the distribution substation automation high-voltage management and control framework includes a distribution automation master station (referred to as a distribution master station), a fusion terminal, an inverter, a new energy access monitoring device and a photovoltaic array. Among them, the point where the new energy access monitoring device is connected to the 220V / 380V distribution line is called the grid connection point. The southbound infrastructure is the new energy access monitoring device, the inverter and the photovoltaic array. The overvoltage control method of the embodiment of the present invention is deployed in the intelligent fusion terminal of the substation area as the core of edge computing, and its northbound is the distribution master station. The fusion terminal uploads the substation and photovoltaic data, and receives the group adjustment and group control instructions from the distribution master station. The fusion terminal sends control instructions to the new energy access monitoring device in the south and receives inverter data.

[0084] The real-time monitoring module in the fusion terminal is used to monitor the voltage over-limit of the grid connection point. Whenever an over-limit event occurs, all inverters are controlled to absorb reactive power until the power factor of all inverters drops to the set threshold (for example, 90%). The absorption of reactive power regulation can be achieved by adjusting parameters such as the voltage setting value, the induced current setting value, and the power factor setting value. By adjusting the voltage setting value, the adjustment range and accuracy of the reactive power can be affected, thereby indirectly controlling the absorption of reactive power. By controlling the size of the induced current, the generation and absorption of reactive power are directly affected. Reducing the induced current setting value can promote the absorption of reactive power. The power factor target value of the system can be changed by adjusting the power factor setting value. When the target power factor is set lower, the system needs to absorb more reactive power to achieve the target.

[0085] Step 200: Obtain a historical curve.

[0086] Among them, the historical curve is obtained by superimposing the power generation power-voltage curves of all grid-connected points and the power consumption power-voltage curves of all loads in the same historical period. In the fusion terminal, the data center module can periodically write historical data (such as 5 minutes), and train and fit the historical curves of power generation power, power consumption and voltage (Pv-P, U) to guide regulation. The embodiment of the present invention adopts a regulation mechanism based on over-limit events. The real-time monitoring module in the fusion terminal monitors the voltage over-limit of the grid-connected point. Whenever an over-limit event occurs, the fusion terminal sends a regulation strategy to the over-limit grid-connected points in the real-time monitoring queue according to the current real-time voltage collected and the historical curve of power generation power, power consumption and voltage (Pv-P, U) fitting as follows. The regulation is completed by sending it to the inverter uniformly before the next read cycle through the power line carrier, and the autonomous group regulation and control of the substation is completed.

[0087] Step 300: Determine the active power to be adjusted of all grid-connected points based on the historical curve.

[0088] Step 400: Regulate the active power of all inverters based on the active power to be adjusted of all grid-connected points.

[0089] The historical curve contains the relationship between the on-site grid-connected points, the topological relationship, and the power generation and consumption habits. Based on the target current obtained by the current power generation and voltage ratio, the active power to be adjusted for each grid-connected point can be determined from the historical curve. When the reactive power regulation reaches the upper limit, the active power of all inverters is adjusted based on the active power to be adjusted of all grid-connected points, completing the autonomous group regulation and control of the substation.

[0090] The historical curve of the power generation, power consumption and voltage composition of the present invention implies the relationship between the on-site grid connection points, the topological relationship and the power generation and power consumption habits. Through historical curve regulation, the mutual influence of power regulation on line voltage can be avoided, and the effectiveness of regulation can be improved. In addition, the present invention comprehensively considers reactive power regulation and active power regulation to maximize the power generation while ensuring the quality of power consumption. Therefore, the present invention ensures the safety of user power consumption and the safety of the power grid area from exceeding the limit, while ensuring the user's power generation income as much as possible and improving the regulation effect.

[0091] In other aspects of the embodiments of the present invention, the historical curve is obtained by the following steps:

[0092] Step 1: Obtain the power generation-voltage curves of all grid-connected points at a set power factor within a set historical period.

[0093] Step 2: Obtain the power consumption-voltage curves of all loads in the set historical period at the set power factor.

[0094] Step 3: Determine the topological relationship between each grid connection point and the corresponding load.

[0095] Step 4: based on the topological relationship, the power generation-voltage curve of each grid-connected point is subtracted from the power consumption-voltage curve of the corresponding load to obtain the historical curve.

[0096] Please refer to Figure 3 , the data fitting curve stage of the embodiment of the present invention, for example, the embodiment of the present invention can use the historical data of the past five days when the grid-connected power factor of all inverters is 90% of the lower limit (taking 90% as an example) to fit the curve. In the case of a known topology, the power generation power Pv and voltage U curves of each inverter's grid-connected point are fitted respectively to obtain the power generation power-voltage curve of each inverter's grid-connected point. And the power consumption P and voltage U curves of each load are fitted to obtain the power consumption-voltage curves of all loads. The embodiment of the present invention determines the topological relationship of all inverters and loads according to the field topology. For example, inverter 1 is used to power load 1, load 2 and load 3. Wherein load 1, load 2 and load 3 can be loads in household appliances (refrigerators, air conditioners, etc.), lighting equipment (electric lights, LED lights, etc.), industrial equipment (various production machines), and commercial equipment (refrigeration equipment in supermarkets, elevators, etc.). The power generation power-voltage curves of all grid-connected points are superimposed with all load curves after obtaining the topological position to obtain the (Pv-∑P, U) curve. For example, the power generation power-voltage curve of each grid-connected point is subtracted from the power consumption power-voltage curves of all corresponding loads to obtain a historical curve.

[0097] Among them, the horizontal axis in the historical curve is the difference between the power generation power of the grid connection point at the same time and the power consumption of all corresponding loads, and the vertical axis is the voltage value. The historical curve of the embodiment of the present invention is derived from the actual situation in reality. When the topology remains basically unchanged in the past few days, it reflects the surface and potential characteristics and associations of the grid connection points and load points in the distribution station area, laying the foundation for the subsequent use of the historical curve to guide regulation. It should be noted that when the line topology relationship is unknown, the embodiment of the present invention can only use the power generation power-voltage curve ((Pv, U) curve) to approximately guide overvoltage regulation.

[0098] In other aspects of the embodiments of the present invention, step 100, controlling all inverters to absorb reactive power regulation until the power factors of all inverters drop to a set threshold, includes:

[0099] Repeat the following steps until the power factors of all inverters drop to the set threshold:

[0100] Step 110: Control the power factors of all inverters to decrease according to a set ratio.

[0101] Step 120: Obtain the power factors of all inverters.

[0102] Please refer to Figure 3 , after the data fitting curve stage, the embodiment of the present invention performs the real-time control stage, and first performs reactive power absorption adjustment (or reactive absorption adjustment). First, it is determined whether each inverter has adjustable reactive power and the power factor has not reached the set lower limit of 90%. Specifically, the power factor of the inverter can be obtained by obtaining the reading of the inverter's operation interface. The embodiment of the present invention adjusts the power factor of the inverter in two stages to absorb reactive power. For example, the adjustment is divided into two times, and the power factor of all inverters is reduced by 5% each time. After each adjustment, the power consumption-voltage curve (Qv, U) and power factor of each inverter are read. If the voltage does not exceed the limit, the regulation is terminated and voltage monitoring continues; if the voltage still exceeds the limit and there is still room for downward adjustment, the power factor of the inverter is adjusted again to the lower limit, otherwise active power regulation is performed.

[0103] In other aspects of the embodiments of the present invention, step 300, determining the active power to be adjusted of all grid-connected points based on the historical curve, includes:

[0104] Step 310: Calculate the target current based on the current generated power and the current over-limit voltage.

[0105] Step 320: determine from the historical curve the historical current of the first grid-connected point that is closest to the target current without exceeding the set over-limit voltage threshold, and determine a first difference between the historical generated power and the historical power consumption of all loads when the historical current occurs.

[0106] Step 330: Obtain a second difference between the current generated power and the current power consumption of all loads.

[0107] Step 340: Calculate the difference between the first difference and the second difference to obtain the active power to be adjusted of the first grid-connected point.

[0108] First, the embodiment of the present invention calculates the target current based on the ratio of the current generated power to the current over-limit voltage. The embodiment of the present invention requires active power regulation for all grid-connected points. The embodiment of the present invention is described based on the active power regulation of the first grid-connected point. Among them, the first grid-connected point is any grid-connected point among all grid-connected points. According to the generated power Pv and voltage U curves of the grid-connected points of each inverter, the current of each inverter can be obtained. The embodiment of the present invention determines from the historical curve the historical current of the first grid-connected point that is closest to the target current without exceeding the set over-limit voltage threshold. Therefore, according to the historical current, the first difference between the corresponding historical generated power and the historical power consumption of all loads can be determined. The embodiment of the present invention then obtains the second difference between the current generated power and the current power consumption of all loads, thereby calculating the difference between the first difference and the second difference, and obtaining the active power to be adjusted of the first grid-connected point. Please refer to Figure 3 Specifically, the active power to be adjusted can be expressed by the formula: ΔPv = (Pv-∑P)|U not exceeding the limit - (Pv-∑P)|current. Among them, (Pv-∑P)|U not exceeding the limit represents the first difference between the historical power generation power and the historical power consumption of all loads when the historical current occurs; (Pv-∑P)|current represents the second difference between the current power generation power and the current power consumption of all loads. It should be noted that the active power to be adjusted ΔPv calculated in the embodiment of the present invention is a negative value.

[0109] The embodiment of the present invention obtains the active power to be adjusted based on the historical curve of power generation, power consumption, and voltage (Pv-P, U) to guide overvoltage regulation. Since the historical curve implies the relationship between on-site grid points, topological relationship, and power generation and power consumption habits, the active power to be adjusted is obtained through the historical curve for regulation, which can avoid the mutual influence of power regulation on line voltage and improve the effectiveness of regulation.

[0110] In other aspects of the embodiments of the present invention, step 400, adjusting the active power of all inverters based on the active power to be adjusted of all grid-connected points, includes:

[0111] Repeat the following steps until there are no voltage overlimits:

[0112] Step 410: Calculate the inverter control condition based on the set over-limit voltage threshold, the first grid connection point voltage, the transformer voltage in the substation area, and the number of inverters in the substation area.

[0113] Step 420: When the voltage of the first grid-connected point is greater than the regulation condition of the inverter, sum the current active power of the inverter and the active power to be adjusted of the first grid-connected point.

[0114] Step 430: When the voltage is still over-limited, the active power to be adjusted of the first grid-connected point is adjusted based on a first set ratio to obtain a first updated active power to be adjusted of the first grid-connected point.

[0115] Step 440: sum the current active power of the inverter and the first updated active power to be adjusted.

[0116] Please refer to Figure 3 , the embodiment of the present invention can calculate the control condition of the inverter based on the set over-limit voltage threshold, the first grid connection point voltage, the transformer voltage of the substation, and the number of inverters in the substation. Therefore, according to the size relationship between the voltage of the grid connection point and the control condition of the inverter, it is determined whether the grid connection point accepts the control suggestion of active power. Specifically, based on the set over-limit voltage threshold, the first grid connection point voltage, the transformer voltage of the substation, and the number of inverters in the substation, the control condition of the inverter is calculated, which can be calculated by the following formula:

[0117] Ucond=Ulim-(Um-U0) / N; formula (1)

[0118] Ucond is the control condition of the inverter, Ulim is the set over-limit voltage threshold, Um is the voltage of the first grid-connected point, U0 is the transformer voltage in the substation, and N is the number of inverters in the substation. That is, the control condition of the inverter at each grid-connected point is calculated based on formula (1). The control condition of the inverter at each grid-connected point is calculated by formula (1) to determine whether to accept the control suggestion from the historical curve to adjust the active power. If the calculated inverter control condition Ucond < the real-time voltage of the first grid-connected point, it indicates that the first grid-connected point has a great impact on the voltage rise and may be located on the same over-limit voltage line, then the control suggestion is accepted and the control instruction is issued; otherwise, the inverter is not adjusted in this round.

[0119] When the voltage of the first grid-connected point is greater than the regulation condition of the inverter, the current active power of the inverter and the active power to be adjusted of the first grid-connected point are summed. Initialize the step size Λ=1, and adjust the active power of the inverter to Pv+ΔPv. Wherein Pv is the current active power of the inverter, and ΔPv is the active power to be adjusted calculated in step 300. Read the current inverter power generation and voltage curve (Pv, U). If it is found that the adjustment is still over the limit, the active power to be adjusted of the first grid-connected point is adjusted based on the first set ratio, and the first updated active power to be adjusted of the first grid-connected point is obtained, and the current active power of the inverter and the first updated active power to be adjusted are summed. Specifically, the step size Λ is reduced by 20%, and the active power to be adjusted is continuously reduced to Λ*ΔPv, and the next round of active power regulation is performed until the voltage does not exceed the limit.

[0120] In other aspects of the embodiments of the present invention, the method further includes:

[0121] When the active power of the inverter is lower than the set active power threshold, the following steps are repeatedly performed until the active power of the inverter is greater than the set active power threshold:

[0122] Step 450: Adjust the active power to be adjusted of the first grid-connected point based on the second set ratio to obtain a second updated active power to be adjusted of the first grid-connected point.

[0123] Step 460: Calculate the difference between the current active power of the inverter and the second updated active power to be adjusted.

[0124] Please refer to Figure 3If the adjustment range is too large, the active power Pv of the inverter is less than the set active power threshold (the full active power Pv of the inverter*X% lower limit), where X% can be 80%. Then fine-tune upward by 80%, let Λ=80%*Λ, the second updated active power to be adjusted is ΔPv=Λ*ΔPv, and the active power of the inverter is adjusted to Pv-ΔPv. Read the current inverter power generation and voltage curve (Pv, U) until the upper and lower limits are qualified, and complete this round of adjustment. Continue voltage monitoring.

[0125] The first grid-connected point is any grid-connected point among all grid-connected points. Therefore, active power regulation is performed for each grid-connected point based on the process of steps 410-460.

[0126] In summary, the embodiment of the present invention does not require advance training and manual instruction issuance based on the actual historical data of the deployed substations. Through real-time reactive power control and active power control, it ensures that the user's power generation is as large as possible while preventing the voltage from exceeding the limit. Since the historical curve composed of power generation power, power consumption and voltage (Pv-P, U) implies the mutual influence brought about by the field topology and distribution line voltage changes, and it belongs to online training with low training overhead. The biggest advantage of the embodiment of the present invention is that it can be effectively applied to distribution substations with different topologies and power generation and consumption conditions, without the need for advance training, model configuration, and human intervention, it has good adaptability and promotion value.

[0127] In other words, the embodiment of the present invention can be effectively applied to various different distribution substations without the need for manual pre-model configuration and post-instruction issuance, giving full play to the edge computing capabilities of the substation fusion terminal to achieve autonomous high-voltage management in the substation. The embodiment of the present invention comprehensively considers reactive power regulation and active power regulation to maximize power generation while ensuring the quality of power consumption. The embodiment of the present invention guides the quality of regulation based on a historical curve composed of generated power, consumed power, and voltage (Pv-P, U). Since the historical curve implies the relationship between on-site grid connection points, topological relationships, and power generation and consumption habits, the present invention avoids the mutual influence of power regulation on line voltage, improves the effectiveness of regulation, and guarantees the power generation income of users as much as possible while ensuring the safety of users' power consumption and the safety of power grid substations.

[0128] Device Embodiment

[0129] On the other hand, please refer to Figure 4 The embodiment of the present invention further provides an overvoltage control device, comprising:

[0130] The reactive power control module 401 is used to control all inverters to absorb reactive power when voltage over-limit is detected, until the power factor of all inverters drops to a set threshold;

[0131] An acquisition module 402 is used to acquire a historical curve; the historical curve is obtained by superimposing the power generation power-voltage curves of all grid-connected points and the power consumption power-voltage curves of all loads in the same historical period;

[0132] A determination module 403, configured to determine the active power to be adjusted of all grid-connected points based on the historical curve;

[0133] The active power control module 404 is used to adjust the active power of all inverters based on the active power to be adjusted of all grid-connected points.

[0134] The historical curve of the power generation, power consumption and voltage composition of the present invention implies the relationship between the on-site grid connection points, the topological relationship and the power generation and power consumption habits. Through historical curve regulation, the mutual influence of power regulation on line voltage can be avoided, and the effectiveness of regulation can be improved. In addition, the present invention comprehensively considers reactive power regulation and active power regulation to maximize the power generation while ensuring the quality of power consumption. Therefore, the present invention ensures the safety of user power consumption and the safety of the power grid area from exceeding the limit, while ensuring the user's power generation income as much as possible and improving the regulation effect.

[0135] Optionally, controlling all inverters to absorb reactive power until the power factors of all inverters drop to a set threshold value includes:

[0136] Repeat the following steps until the power factors of all inverters drop to the set threshold:

[0137] Control the power factor of all inverters to decrease according to the set ratio;

[0138] Get the power factor of all inverters.

[0139] Optionally, the historical curve is obtained by following the steps:

[0140] Obtain the power generation-voltage curves of all grid-connected points at the set power factor within the set historical period;

[0141] Obtaining the power consumption-voltage curves of all loads in the set historical period at the set power factor;

[0142] Determine the topological relationship between each grid connection point and the corresponding load;

[0143] Based on the topological relationship, the power generation power-voltage curve of each grid-connected point is subtracted from the power consumption power-voltage curve of the corresponding load to obtain the historical curve.

[0144] Optionally, the determining the active power to be adjusted of all grid-connected points based on the historical curve includes:

[0145] Calculate the target current based on the current generated power and the current over-limit voltage;

[0146] Determine from the historical curve the historical current that is closest to the target current when the first grid connection point does not exceed the set over-limit voltage threshold, and determine a first difference between the historical power generation power and the historical power consumption of all loads when the historical current occurs;

[0147] Obtaining a second difference between the current generated power and the current power consumption of all loads;

[0148] Calculating the difference between the first difference and the second difference to obtain the active power to be adjusted of the first grid connection point;

[0149] The first grid connection point is any grid connection point among all grid connection points.

[0150] Optionally, the performing active power adjustment on all inverters based on the active power to be adjusted of all grid-connected points includes:

[0151] Repeat the following steps until there are no voltage overlimits:

[0152] Calculate the inverter control conditions based on the set over-limit voltage threshold, the first grid connection point voltage, the transformer voltage in the substation area, and the number of inverters in the substation area;

[0153] When the voltage of the first grid-connected point is greater than the regulation condition of the inverter, summing the current active power of the inverter and the active power to be adjusted of the first grid-connected point;

[0154] In the case that the voltage is still over-limited, adjusting the active power to be adjusted of the first grid-connected point based on the first set ratio to obtain a first updated active power to be adjusted of the first grid-connected point;

[0155] summing the current active power of the inverter and the first updated active power to be adjusted;

[0156] The first grid connection point is any grid connection point among all grid connection points.

[0157] Optionally, the device further comprises:

[0158] A control module is used to repeatedly perform the following steps when the active power of the inverter is lower than a set active power threshold until the active power of the inverter is greater than the set active power threshold: adjusting the active power to be adjusted of the first grid-connected point based on a second set ratio to obtain a second updated active power to be adjusted of the first grid-connected point; and calculating the difference between the current active power of the inverter and the second updated active power to be adjusted; wherein the first grid-connected point is any grid-connected point among all grid-connected points.

[0159] The overvoltage control device includes a processor and a memory. The reactive power control module 401, acquisition module 402, determination module 403 and active power control module 404 are all stored in the memory as program units, and the processor executes the program units stored in the memory to implement corresponding functions.

[0160] The processor includes a kernel, which calls the corresponding program unit from the memory. There can be one or more kernels.

[0161] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0162] Figure 5 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 5 As shown, the electronic device may include: a processor 510, a communication interface 520, a memory 530 and a communication bus 540, wherein the processor 510, the communication interface 520 and the memory 530 communicate with each other through the communication bus 540. The processor 510 may call the logic instructions in the memory 530 to execute the overvoltage control method, which includes: in the case of detecting that there is an overvoltage limit, controlling all inverters to absorb reactive power regulation until the power factor of all inverters drops to a set threshold; obtaining a historical curve; the historical curve is obtained by superimposing the power generation power-voltage curve of all grid-connected points and the power consumption power-voltage curve of all loads in the same historical period; determining the active power to be adjusted of all grid-connected points based on the historical curve; and adjusting the active power of all inverters based on the active power to be adjusted of all grid-connected points.

[0163] In addition, the logic instructions in the above-mentioned memory 530 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0164] On the other hand, the present invention also provides a computer program product, which includes a computer program, which can be stored on a machine-readable storage medium. When the computer program is executed by a processor, the computer can execute an overvoltage control method, which includes: when a voltage overlimit is detected, controlling all inverters to absorb reactive power for adjustment until the power factor of all inverters drops to a set threshold; obtaining a historical curve; the historical curve is obtained by superimposing the power generation power-voltage curves of all grid-connected points and the power consumption power-voltage curves of all loads in the same historical period; determining the active power to be adjusted of all grid-connected points based on the historical curve; and adjusting the active power of all inverters based on the active power to be adjusted of all grid-connected points.

[0165] On the other hand, the present invention also provides a machine-readable storage medium having a computer program stored thereon, which is implemented when the processor executes the overvoltage control method, the method comprising: when a voltage overlimit is detected, controlling all inverters to absorb reactive power for adjustment until the power factor of all inverters drops to a set threshold; obtaining a historical curve; the historical curve is obtained by superimposing the power generation power-voltage curves of all grid-connected points and the power consumption power-voltage curves of all loads in the same historical period; determining the active power to be adjusted of all grid-connected points based on the historical curve; and adjusting the active power of all inverters based on the active power to be adjusted of all grid-connected points.

[0166] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0167] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0168] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An overvoltage control method, characterized in that: include: When voltage over-limit is detected, all inverters are controlled to absorb reactive power until the power factor of all inverters drops to the set threshold; Obtaining a historical curve; the historical curve is obtained by superimposing the power generation power-voltage curves of all grid-connected points and the power consumption power-voltage curves of all loads in the same historical period; Determine the active power to be adjusted of all grid connection points based on the historical curve; Active power of all inverters is adjusted based on the active power to be adjusted of all grid-connected points.

2. The overvoltage control method according to claim 1, characterized in that: The controlling all inverters to absorb reactive power until the power factors of all inverters drop to a set threshold value includes: Repeat the following steps until the power factors of all inverters drop to the set threshold: Control the power factor of all inverters to decrease according to the set ratio; Get the power factor of all inverters.

3. The overvoltage control method according to claim 1, characterized in that: The historical curve is obtained by the following steps: Obtain the power generation-voltage curves of all grid-connected points at the set power factor within the set historical period; Obtaining the power consumption-voltage curves of all loads in the set historical period at the set power factor; Determine the topological relationship between each grid connection point and the corresponding load; Based on the topological relationship, the power generation power-voltage curve of each grid-connected point is subtracted from the power consumption power-voltage curve of the corresponding load to obtain the historical curve.

4. The overvoltage control method according to claim 3, characterized in that: The determining the active power to be adjusted of all grid-connected points based on the historical curve includes: Calculate the target current based on the current generated power and the current over-limit voltage; Determine from the historical curve the historical current that is closest to the target current when the first grid connection point does not exceed the set over-limit voltage threshold, and determine a first difference between the historical power generation power and the historical power consumption of all loads when the historical current occurs; Obtaining a second difference between the current generated power and the current power consumption of all loads; Calculating the difference between the first difference and the second difference to obtain the active power to be adjusted of the first grid connection point; The first grid connection point is any grid connection point among all grid connection points.

5. The overvoltage control method according to claim 4, characterized in that: The step of adjusting the active power of all inverters based on the active power to be adjusted of all grid-connected points includes: Repeat the following steps until there are no voltage overlimits: Calculate the inverter control conditions based on the set over-limit voltage threshold, the first grid connection point voltage, the transformer voltage in the substation area, and the number of inverters in the substation area; When the voltage of the first grid-connected point is greater than the regulation condition of the inverter, summing the current active power of the inverter and the active power to be adjusted of the first grid-connected point; In the case that the voltage is still over-limited, adjusting the active power to be adjusted of the first grid-connected point based on the first set ratio to obtain a first updated active power to be adjusted of the first grid-connected point; summing the current active power of the inverter and the first updated active power to be adjusted; The first grid connection point is any grid connection point among all grid connection points.

6. The overvoltage control method according to claim 5, characterized in that: The method further comprises: When the active power of the inverter is lower than the set active power threshold, the following steps are repeatedly performed until the active power of the inverter is greater than the set active power threshold: Adjusting the active power to be adjusted of the first grid-connected point based on a second set ratio to obtain a second updated active power to be adjusted of the first grid-connected point; Calculating the difference between the current active power of the inverter and the second updated active power to be adjusted; The first grid connection point is any grid connection point among all grid connection points.

7. An overvoltage control device, characterized in that: include: The reactive power control module is used to control all inverters to absorb reactive power when voltage over-limit is detected, until the power factor of all inverters drops to a set threshold; An acquisition module is used to acquire a historical curve; the historical curve is obtained by superimposing the power generation power-voltage curves of all grid-connected points and the power consumption power-voltage curves of all loads in the same historical period; A determination module, used to determine the active power to be adjusted of all grid-connected points based on the historical curve; The active power control module is used to adjust the active power of all inverters based on the active power to be adjusted of all grid-connected points.

8. The overvoltage control device according to claim 7, characterized in that: The controlling all inverters to absorb reactive power until the power factors of all inverters drop to a set threshold value includes: Repeat the following steps until the power factors of all inverters drop to the set threshold: Control the power factor of all inverters to decrease according to the set ratio; Get the power factor of all inverters.

9. The overvoltage control device according to claim 7, characterized in that: The historical curve is obtained by the following steps: Obtain the power generation-voltage curves of all grid-connected points at the set power factor within the set historical period; Obtaining the power consumption-voltage curves of all loads in the set historical period at the set power factor; Determine the topological relationship between each grid connection point and the corresponding load; Based on the topological relationship, the power generation power-voltage curve of each grid-connected point is subtracted from the power consumption power-voltage curve of the corresponding load to obtain the historical curve.

10. The overvoltage control device according to claim 9, characterized in that: The determining the active power to be adjusted of all grid-connected points based on the historical curve includes: Calculate the target current based on the current generated power and the current over-limit voltage; Determine from the historical curve the historical current that is closest to the target current when the first grid connection point does not exceed the set over-limit voltage threshold, and determine a first difference between the historical power generation power and the historical power consumption of all loads when the historical current occurs; Obtaining a second difference between the current generated power and the current power consumption of all loads; Calculating the difference between the first difference and the second difference to obtain the active power to be adjusted of the first grid connection point; The first grid connection point is any grid connection point among all grid connection points.

11. The overvoltage control device according to claim 10, characterized in that: The step of adjusting the active power of all inverters based on the active power to be adjusted of all grid-connected points includes: Repeat the following steps until there are no voltage overlimits: Calculate the inverter control conditions based on the set over-limit voltage threshold, the first grid connection point voltage, the transformer voltage in the substation area, and the number of inverters in the substation area; When the voltage of the first grid-connected point is greater than the regulation condition of the inverter, summing the current active power of the inverter and the active power to be adjusted of the first grid-connected point; In the case that the voltage is still over-limited, adjusting the active power to be adjusted of the first grid-connected point based on the first set ratio to obtain a first updated active power to be adjusted of the first grid-connected point; summing the current active power of the inverter and the first updated active power to be adjusted; The first grid connection point is any grid connection point among all grid connection points.

12. The overvoltage control device according to claim 10, characterized in that: The device also includes: A control module is used to repeatedly perform the following steps when the active power of the inverter is lower than a set active power threshold until the active power of the inverter is greater than the set active power threshold: adjusting the active power to be adjusted of the first grid-connected point based on a second set ratio to obtain a second updated active power to be adjusted of the first grid-connected point; and calculating the difference between the current active power of the inverter and the second updated active power to be adjusted; wherein the first grid-connected point is any grid-connected point among all grid-connected points.

13. An electronic 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 program, the overvoltage control method according to any one of claims 1 to 6 is implemented.

14. A machine-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the overvoltage control method according to any one of claims 1 to 6 is implemented.

15. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the overvoltage control method according to any one of claims 1 to 6 is implemented.

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