A plug-and-play intelligent reactive power compensation device structure

Abstract

This invention relates to the field of power electronics technology, and more particularly to a plug-and-play intelligent reactive power compensation device structure, comprising: a housing with power capacitors installed at the bottom for compensating for reactive power in the power grid; intelligent switches corresponding to the capacitors at the top for controlling their connection or disconnection; voltage and current transformers installed on the power grid input lines to monitor grid voltage and current in real time; a controller with several transmission channel interfaces on its surface, connected to the voltage and current transformers respectively, for receiving several real-time voltage and current values, analyzing these values ​​to calculate the actual reactive power compensation amount, and generating switch control commands based on the actual reactive power compensation amount; and real-time detection of changes in real-time grid input parameters during capacitor adjustment to adjust the switch control commands accordingly. This invention improves the stability of power grid operation.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and in particular to a plug-and-play intelligent reactive power compensation device structure. Background Technology

[0002] In industrial production and other power consumption scenarios, a large number of inductive loads consume a lot of reactive power, resulting in a decrease in the power factor. This causes a considerable proportion of the electrical energy transmitted by the power grid to be used to establish magnetic fields rather than to do work, resulting in energy waste and increased line losses.

[0003] Chinese patent application publication number CN115411744A discloses an intelligent reactive power compensation device. This device includes a power input terminal for connecting to AC power, a power output terminal for outputting AC power to a load, a current sampling unit connected between the power input terminal and the power output terminal, a control unit connected to the current sampling unit, at least one reactive power compensation unit connected between the control unit and the power output terminal, a first solid-state switch whose trigger signal input terminal is connected to the first trigger signal output terminal of a zero-crossing trigger circuit, a first relay connected to the first and third phase lines of the three-phase AC power via the first solid-state switch, a second solid-state switch whose trigger signal input terminal is connected to the second trigger signal output terminal of the zero-crossing trigger circuit, a second relay connected to the second and first phase lines of the three-phase AC power via the second solid-state switch, a third solid-state switch whose trigger signal input terminal is connected to the third trigger signal output terminal of the zero-crossing trigger circuit, and a third relay connected to the third and second phase lines of the three-phase AC power via the third solid-state switch.

[0004] Existing technologies employ a control method that combines zero-crossing trigger circuits with solid-state switches and relays. The timing of zero-crossing triggering is relatively fixed, making it difficult to make flexible and precise adjustments based on the complex real-time reactive power demand of the power grid. This results in the power factor of the power grid not being able to be stably maintained within the ideal range, causing instability in the operation of the power grid. Summary of the Invention

[0005] To address this, the present invention provides a plug-and-play intelligent reactive power compensation device structure. By accurately calculating the actual reactive power compensation amount through real-time voltage and current parameters, it generates highly accurate switching control commands to drive intelligent switches to quickly and accurately switch power capacitors, thereby achieving refined management of reactive power compensation and solving the problem of unstable grid operation.

[0006] To achieve the above objectives, the present invention provides a plug-and-play intelligent reactive power compensation device structure, comprising:

[0007] Box;

[0008] Several power capacitors are installed inside the lower part of the enclosure to compensate for reactive power of the power grid;

[0009] A plurality of intelligent switches are arranged above the plurality of capacitors and connected with the plurality of power capacitors one by one, to determine the open or closed state of the switch according to the control instruction;

[0010] A voltage transformer is arranged on the power grid input wire to detect the real-time voltage value of the power grid input in real time;

[0011] A current transformer is arranged on the power grid input wire to detect the real-time current value of the power grid input in real time;

[0012] A controller is arranged with a plurality of transmission channel interfaces on its surface, and for any transmission channel interface, it is connected with the voltage transformer and the current transformer respectively to receive a plurality of real-time voltage values and a plurality of real-time current values, analyze the plurality of real-time voltage values and the plurality of real-time current values, calculate the actual reactive power compensation amount based on the parameter analysis result, and generate the switch control instruction according to the actual reactive power compensation amount;

[0013] In addition, the change of the real-time power grid input parameter in the capacitor adjustment process is detected in real time, and the switch control instruction is adjusted according to the parameter change;

[0014] The controller comprises:

[0015] A transmission control unit is used to determine the actual data transmission efficiency and the actual data transmission stability, adjust the initial connection number of the transmission channel interface based on the actual data transmission efficiency and the actual data transmission stability, or replace the initial connected transmission channel interface based on the mechanical hand;

[0016] A calculation unit is connected with the transmission control unit to calculate the actual active power and the actual reactive power based on the plurality of real-time voltage values and the plurality of real-time current values, calculate the reactive power compensation target value based on the actual active power and the preset power factor target value, compare the actual reactive power with the reactive power compensation target value, and determine the actual reactive power compensation amount based on the comparison result;

[0017] An instruction generation unit is connected with the calculation unit to determine the switch closing strategy based on the actual reactive power compensation amount, and generate the switch control instruction according to the switch closing strategy;

[0018] An adjustment unit is connected with the instruction generation unit to detect the change of the real-time power grid input parameter in the capacitor adjustment process in real time, and adjust the switch control instruction according to the parameter change;

[0019] The transmission control unit comprises:

[0020] An efficiency determination sub-unit is used to collect real-time data flow at the initial connected transmission channel interface and the real-time collection time in real time, calculate the actual data transmission efficiency of data transmission per unit time based on the real-time collection time and the real-time data flow;

[0021] a stability determination subunit configured to determine data acquisition uniformity and data acquisition volatility of a plurality of real-time current values and a plurality of real-time voltage values, and determine actual data transmission stability according to the data acquisition uniformity and the data acquisition volatility;

[0022] an adjustment subunit connected with the efficiency determination subunit and the stability determination subunit respectively, configured to determine transmission efficiency stability based on a comparison result of the actual data transmission efficiency and a preset data transmission efficiency, determine an initial connection quantity of the transmission channel interface based on the transmission efficiency stability and the actual data transmission stability, or replace the initial connection of the transmission channel interface based on the mechanical hand;

[0023] the calculation unit comprises:

[0024] an active power calculation subunit configured to convert a plurality of the real-time voltage values and a plurality of the real-time current values into frequency domain signals, analyze the frequency domain signals to obtain fundamental voltage and fundamental current, determine fundamental voltage effective value, fundamental current effective value and actual phase difference between the voltage and the current based on the fundamental voltage signal and the fundamental current signal, and further determine actual active power;

[0025] a reactive power calculation subunit connected with the active power calculation subunit, configured to determine actual reactive power based on an analysis result of the frequency domain signals;

[0026] a compensation calculation subunit configured to calculate reactive power compensation target value based on the actual active power and a preset power factor target value, calculate a difference value between the actual reactive power and the reactive power compensation target value, and determine actual reactive compensation amount based on a result of the difference value calculation;

[0027] the instruction generation unit comprises:

[0028] a capacitor analysis subunit configured to obtain and analyze historical input duration and historical switching times of a plurality of the power capacitors, sort the plurality of the power capacitors based on an analysis result of the historical input duration and the historical switching times, and obtain capacitor sorting result;

[0029] a switch analysis subunit configured to obtain historical opening and closing times, historical action time intervals and real-time opening and closing states of a plurality of the intelligent switches, analyze the historical opening and closing times, the historical action time intervals and the real-time opening and closing states, sort the plurality of the intelligent switches based on an analysis result, and obtain switch sorting result;

[0030] an instruction generation subunit configured to determine switch control strategy based on the actual reactive compensation amount, the capacitor sorting result and the switch sorting result, and generate switch control instruction according to the switch control strategy;

[0031] the adjustment unit comprises:

[0032] a parameter analysis subunit configured to monitor a plurality of real-time input parameters of the power grid in real time, draw a parameter change graph based on the plurality of real-time input parameters, analyze the parameter change graph to identify a trend and a magnitude of parameter change, and determine an actual parameter fluctuation stability;

[0033] an instruction adjustment subunit connected with the parameter analysis subunit and configured to adjust the switch control instruction according to the actual parameter fluctuation stability.

[0034] Further, the stability determination subunit comprises:

[0035] an interval monitoring block configured to monitor a plurality of current time instants corresponding to the real-time current values and a plurality of voltage time instants corresponding to the real-time voltage values in real time, calculate a plurality of current time instant intervals and a plurality of voltage time instant intervals based on the plurality of current time instants and the plurality of voltage time instants respectively, and analyze the plurality of current time instant intervals and the plurality of voltage time instant intervals respectively to determine a current uniformity and a voltage uniformity;

[0036] a fluctuation analysis block configured to calculate a plurality of real-time current value differences between adjacent current time instants, count absolute values of the plurality of real-time current value differences and frequencies corresponding to the absolute values, and determine a current fluctuation based on the absolute values and the analysis results of the absolute value frequencies;

[0037] and calculate a plurality of real-time voltage value differences between adjacent voltage time instants, count absolute values of the plurality of real-time voltage value differences and frequencies corresponding to the absolute values, and determine a voltage fluctuation based on the absolute values and the analysis results of the absolute value frequencies;

[0038] a stability determination block configured to determine a current transmission stability based on the current uniformity and the current fluctuation, and determine a voltage transmission stability based on the voltage uniformity and the voltage fluctuation.

[0039] Further, the interval monitoring block comprises:

[0040] a curve drawing sub-block configured to draw a current time instant interval change curve based on the plurality of current time instant intervals, and draw a voltage time instant interval change curve based on the plurality of voltage time instant intervals;

[0041] a uniformity determination sub-block connected with the curve drawing sub-block and configured to determine a plurality of slope values corresponding to a plurality of points on the current time instant interval change curve, calculate a mean value of absolute values of the plurality of slope values as the current uniformity;

[0042] and determine a plurality of slope values corresponding to a plurality of points on the voltage time instant interval change curve, and calculate a mean value of absolute values of the plurality of slope values as the voltage uniformity.

[0043] Further, the adjustment subunit comprises:

[0044] An efficiency comparison block is configured to compare the actual data transmission efficiency with a preset data transmission efficiency, obtain an efficiency comparison result, and determine transmission efficiency stability based on the efficiency comparison result.

[0045] A quantity adjustment block is connected with the efficiency comparison block and is configured to adjust the initial connection quantity of the transmission channel interface when the transmission efficiency is unstable and the actual data transmission is stable.

[0046] A replacement block is connected with the efficiency comparison block and is configured to replace the transmission channel interface of the initial connection based on the manipulator when the transmission efficiency is stable and the actual data transmission is unstable.

[0047] Further, the parameter analysis subunit comprises:

[0048] A trend identification block is configured to analyze the parameter change graph by an exponential smoothing algorithm to determine a parameter change trend.

[0049] An amplitude evaluation block is configured to calculate a region proportion corresponding to a region exceeding a preset amplitude value in the parameter change graph.

[0050] A stability determination block is configured to determine actual parameter fluctuation stability based on the parameter change trend and the region proportion.

[0051] Compared with the prior art, the box is provided with internal power capacitors, intelligent switches and controllers, which provide physical protection for key components, a plurality of precise reactive power injection or absorption to the power grid is provided, the power factor of the power grid is effectively improved, the transmission of reactive current on the line is reduced, the line loss is reduced, the power transmission efficiency is improved, the intelligent switches respond extremely fast and timely track the dynamic changes of the reactive power of the power grid, the switching state of the capacitors is quickly adjusted when the reactive power demand of the power grid changes instantaneously, the timeliness and accuracy of reactive compensation are ensured, the stable operation of the reactive compensation system is ensured, the voltage transformer and the current transformer are provided, the voltage value and the current value input by the power grid are detected in real time and with high precision, reliable data basis is provided for subsequent reactive power calculation and compensation control, the transmission channel interface on the surface of the controller ensures high-speed and stable data interaction between the controller and each detection component, the timeliness of real-time data acquisition is realized, the received real-time voltage value and current value are deeply analyzed, the actual reactive compensation amount is accurately calculated, the switching control instruction is dynamically adjusted according to the parameters, the load change of the power grid is adaptively adjusted, the reactive compensation effect is ensured to be always in the best state, and the power grid is maintained to be stable and efficient.

[0052] Especially, by setting the transmission control unit, the data flow at the transmission channel interface and the collection time are monitored in real time, the actual data transmission efficiency per unit time is accurately calculated, the data collection uniformity and volatility of real-time current value and voltage value are deeply analyzed, the actual data transmission stability is determined, the data can be timely and completely sent to the controller for processing, the delay or failure of reactive power compensation caused by data transmission problems is avoided, the real-time and accuracy of the whole system are ensured, the reactive power compensation target value and the actual reactive power compensation amount are accurately calculated by setting the calculation unit, the supply-demand gap of the grid reactive power is accurately quantified, which provides an indispensable basis for subsequent accurate compensation, ensures the targeted action of the capacitor switching, avoids energy waste or deterioration of power quality caused by blind compensation, effectively improves the operation economy and stability of the grid, the accurate and efficient control of the capacitor switching is realized by setting the instruction generation unit to generate the switching control instruction, the timeliness and reliability of the grid reactive power compensation are ensured, the stable operation of the grid is maintained, the actual parameter fluctuation stability is accurately determined by setting the adjustment unit, the capacitor combination input mode is dynamically adjusted, the reactive power compensation strategy is re-planned, and the reliability and adaptability of the grid operation are improved.

[0053] Especially, by setting the efficiency determination sub-unit, the real-time data flow at the initially connected transmission channel interface and the corresponding real-time collection time are accurately collected to determine the actual efficiency of data transmission, the controller can quickly obtain the latest grid data, timely adjust the reactive power compensation strategy, maintain the stability of the grid, avoid over-compensation or under-compensation problems caused by data delay, improve the real-time and accuracy of the whole reactive power compensation device, the stability of the data received by the controller is ensured by setting the stability determination sub-unit, potential data risks are identified, the data quality entering the calculation unit is ensured, the reliability of the reactive power compensation system operation is improved, grid operation failures caused by data abnormalities are reduced, the dynamic and flexible adjustment mechanism is set by setting the adjustment sub-unit, the data transmission is always maintained in an efficient and stable state, the device can accurately and timely respond to the reactive power changes of the grid, and the power quality of the grid is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 The structure diagram of the plug-and-play intelligent reactive power compensation device structure provided by the embodiment of the application is shown in the figure.

[0055] Figure 2 The structure block diagram of the controller in the plug-and-play intelligent reactive power compensation device structure provided by the embodiment of the application is shown in the figure.

[0056] Figure 3 The structure block diagram of the transmission control unit in the plug-and-play intelligent reactive power compensation device structure provided by the embodiment of the application is shown in the figure.

[0057] Figure 4The structural block diagram of the calculation unit in the plug-and-play intelligent reactive power compensation device structure provided by the embodiment of the present application is shown. DETAILED DESCRIPTION

[0058] In order to make the objects and advantages of the present application more clear, the present application will be further described below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0059] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that the embodiments are only used to explain the technical principles of the present application and not to limit the protection scope of the present application.

[0060] It should be noted that, in the description of the present application, the terms of direction or position relationship such as "upper", "lower", "left", "right", "inner" and "outer" are based on the direction or position relationship shown in the drawings, which is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

[0061] In addition, it should also be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the terms of "mounting", "connecting" and "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0062] Please refer to Figure 1 The embodiment of the present application provides a plug-and-play intelligent reactive power compensation device structure, which comprises:

[0063] a box body 1;

[0064] a plurality of power capacitors 7 arranged below the inside of the box body and used for compensating the reactive power of the power grid;

[0065] a plurality of intelligent switches 6 arranged above the plurality of capacitors and connected with the plurality of power capacitors one by one, used for determining the opening or closing state of the switch according to the control instruction;

[0066] a voltage transformer 5 arranged on the input power line of the power grid and used for detecting the real-time voltage value of the input of the power grid in real time;

[0067] a current transformer 4 arranged on the input power line of the power grid and used for detecting the real-time current value of the input of the power grid in real time;

[0068] The controller 2 is provided with a plurality of transmission channel interfaces 3 on the surface, and each transmission channel interface is connected with a voltage transformer and a current transformer respectively to receive a plurality of real-time voltage values and a plurality of real-time current values, analyze the plurality of real-time voltage values and the plurality of real-time current values, calculate an actual reactive power compensation amount based on the parameter analysis result, and generate a switch control instruction according to the actual reactive power compensation amount.

[0069] In addition, the change of the real-time power grid input parameter in the capacitance adjustment process is detected in real time, and the switch control instruction is adjusted according to the parameter change.

[0070] It can be understood that the embodiment of the application further comprises a mechanical hand 8.

[0071] It can be understood that the embodiment of the application further comprises that each functional unit inside the device is connected through standardized plug-ins and interfaces to realize the plug-and-play function. The plug-in adopts a plug-in design, has good contact performance and mechanical stability, and is convenient for installation, disassembly and replacement. The interface circuit has the functions of electrical isolation, filtering, lightning protection and the like, and ensures the accuracy and reliability of signal transmission.

[0072] It can be understood that the embodiment of the application adopts a material with strong durability and certain electromagnetic shielding performance to manufacture the box body, such as galvanized steel plate or aluminum alloy material, which can not only ensure the normal operation environment of internal electronic components, prevent short circuit caused by dust accumulation, corrosion damage caused by moisture erosion and the like, but also reduce the influence of external electromagnetic interference on the device control signal and detection signal, ensure the stability and reliability of device operation, prolong the overall service life of the equipment, and reduce the operation and maintenance cost.

[0073] Specifically, the embodiment of the present application provides physical protection for key components such as power capacitors, intelligent switches and controllers in the box, effectively improves the power factor of the power grid, reduces the transmission of reactive current on the line, reduces line loss, improves power transmission efficiency, quickly and accurately realizes the operation of capacitor input and cut-off according to the accurate control instruction issued by the controller, the response speed of the intelligent switch is extremely fast, timely tracks the dynamic change of the reactive power of the power grid, quickly adjusts the switching state of the capacitor when the reactive demand of the power grid changes instantaneously, ensures the timeliness and accuracy of reactive compensation, guarantees the stable operation of the reactive compensation system, detects the voltage value and current value input by the power grid in real time and high precision through the voltage transformer and the current transformer, provides a reliable data basis for subsequent reactive power calculation and compensation control, ensures high-speed and stable data interaction between the controller surface transmission channel interface and each detection component, realizes the timeliness of real-time data acquisition, accurately calculates the actual reactive compensation amount through in-depth analysis of the received real-time voltage value and current value, dynamically adjusts the switch control instruction according to the parameters, adapts to the load change of the power grid, ensures that the reactive compensation effect is always in the best state, and maintains the stable and efficient operation of the power grid. The plug-and-play intelligent reactive compensation device structure provided by the embodiment of the present application can be used for large-scale power grid safety protection and defense system.

[0074] Referring to Figure 2 As shown in the figure, the controller 2 comprises:

[0075] The transmission control unit 21 is used to determine the actual data transmission efficiency and the actual data transmission stability, adjust the initial connection quantity of the transmission channel interface based on the actual data transmission efficiency and the actual data transmission stability, or replace the initial connection transmission channel interface based on the mechanical hand 8;

[0076] The calculation unit 22 is connected with the transmission control unit 21, and is used to calculate the actual active power and the actual reactive power based on the plurality of real-time voltage values and the plurality of real-time current values, calculate the reactive power compensation target value based on the actual active power and the preset power factor target value, compare the actual reactive power with the reactive power compensation target value, and determine the actual reactive compensation amount based on the comparison result;

[0077] The instruction generation unit 23 is connected with the calculation unit 22, and is used to determine the switch closing strategy based on the actual reactive compensation amount, and generate the switch control instruction according to the switch closing strategy;

[0078] The adjustment unit 24 is connected with the instruction generation unit 23, and is used to detect the change of the real-time grid input parameter in the capacitor adjustment process in real time, and adjust the switch control instruction according to the parameter change.

[0079] Specifically, the embodiment of the present application sets the transmission control unit to monitor the data flow at the transmission channel interface in real time and collect the time, accurately calculates the actual data transmission efficiency in unit time, deeply analyzes the data collection uniformity and volatility of real-time current and voltage values, determines the actual data transmission stability, ensures that data can be timely and completely delivered to the controller for processing, avoids the delay or failure of reactive power compensation caused by data transmission problems, ensures the real-time and accuracy of the entire system, accurately calculates the reactive power compensation target value and the actual reactive power compensation amount through the setting of the calculation unit, accurately quantifies the supply-demand gap of the power grid reactive power, provides an indispensable basis for subsequent accurate compensation, ensures the targeted action of the capacitor switching, avoids energy waste or deterioration of power quality caused by blind compensation, effectively improves the operation economy and stability of the power grid, generates the switching control instruction through the setting of the instruction generation unit to realize accurate and efficient control of the capacitor switching, ensures the timeliness and reliability of the power grid reactive power compensation, maintains the stable operation of the power grid, accurately determines the actual parameter fluctuation stability through the setting of the adjustment unit, dynamically adjusts the capacitor combination input mode, re-plans the reactive power compensation strategy, and improves the reliability and adaptability of the power grid operation.

[0080] It can be understood that the power factor target value of the embodiment of the present application is usually set to 0.9-0.95 for general industrial power grids; for the fields such as precision electronic manufacturing which have high requirements on power quality, the target value may be higher, close to 1, and the power factor target value in the embodiment of the present application is set to 0.9.

[0081] Referring to Figure 3 As shown in the figure, the transmission control unit 21 comprises:

[0082] The efficiency determination sub-unit 211 is used to collect the real-time data flow at the initially connected transmission channel interface and the real-time collection time in real time, and calculate the actual data transmission efficiency of data transmission in unit time based on the real-time collection time and the real-time data flow.

[0083] The stability determination sub-unit 212 is used to determine the data collection uniformity and data collection volatility of a plurality of real-time current values and a plurality of real-time voltage values, and determine the actual data transmission stability according to the data collection uniformity and the data collection volatility.

[0084] The adjustment sub-unit 213 is connected with the efficiency determination sub-unit 211 and the stability determination sub-unit 212 respectively, and is used to determine the transmission efficiency stability based on the comparison result of the actual data transmission efficiency and the preset data transmission efficiency, determine the initial connection number of the transmission channel interface based on the transmission efficiency stability and the actual data transmission stability, or replace the initially connected transmission channel interface based on the mechanical hand.

[0085] Specifically, the embodiment of the present application determines the actual efficiency of data transmission by setting the efficiency determination subunit to accurately collect the real-time data flow at the initial connection transmission channel interface and the corresponding real-time collection time, ensures that the controller can quickly obtain the latest power grid data, timely adjusts the reactive power compensation strategy, maintains the stability of the power grid, avoids overcompensation or undercompensation problems caused by data delay, improves the real-time performance and accuracy of the entire reactive power compensation device, ensures the stability of the data received by the controller through the setting of the stability determination subunit, identifies potential data risks, guarantees the data quality entering the calculation unit, improves the reliability of the operation of the reactive power compensation system, reduces power grid operation failures caused by abnormal data, and sets a dynamic and flexible adjustment mechanism through the setting of the adjustment subunit to always maintain the data transmission in an efficient and stable state, so that the device can accurately and timely respond to changes in the power grid reactive power and ensure the power quality of the power grid.

[0086] It can be understood that the actual data transmission flow collected by the efficiency determination subunit of the embodiment of the present application can be collected by a flow sensor.

[0087] It can be understood that the efficiency determination subunit of the embodiment of the present application can calculate the mean of the difference values of the real-time data flow corresponding to several adjacent collection time points as the actual data transmission efficiency, for example, the actual collection time points are a, b, and c, wherein the actual data flow value corresponding to the time point a is Qa, the actual data flow value corresponding to the time point b is Qb, and the actual data flow value corresponding to the time point c is Qc, then the actual data transmission efficiency E = 1 / 2 x ((|Qb-Qa|) / (|b-a|)+(|Qc-Qb|) / |c-b|).

[0088] Specifically, the stability determination subunit comprises:

[0089] The interval monitoring block is used to monitor the current time corresponding to the real-time current value and the voltage time corresponding to the real-time voltage value in real time, calculate the current time interval and the voltage time interval based on the plurality of current time points and the plurality of voltage time points respectively, and analyze the plurality of current time interval and the plurality of voltage time interval to determine the current uniformity and the voltage uniformity;

[0090] The fluctuation analysis block is used to calculate the difference between the real-time current values corresponding to adjacent current time points, count the absolute values of a plurality of real-time current difference values and the frequencies corresponding to the absolute values, and determine the current fluctuation based on the absolute values and the analysis results of the absolute value frequencies;

[0091] and calculate the difference between the real-time voltage values corresponding to adjacent voltage time points, count the absolute values of a plurality of real-time voltage difference values and the frequencies corresponding to the absolute values, and determine the voltage fluctuation based on the absolute values and the analysis results of the absolute value frequencies;

[0092] Stable determination block is used to determine current transmission stability based on current uniformity and current fluctuation, and determine voltage transmission stability based on voltage uniformity and voltage fluctuation.

[0093] It can be understood that the current fluctuation can be the absolute value of the real-time current difference value of the real-time current value corresponding to the adjacent current time, the frequency corresponding to the absolute value of a plurality of real-time current difference values is counted, the first proportion of the absolute value of a plurality of real-time current difference values greater than the preset current difference value absolute value is calculated, and the current fluctuation is determined based on the comparison result of the first proportion and the preset proportion.

[0094] The voltage fluctuation can be the absolute value of the real-time voltage difference value of the real-time voltage value corresponding to the adjacent voltage time, the frequency corresponding to the absolute value of a plurality of real-time voltage difference values is counted, the second proportion of the absolute value of a plurality of real-time voltage difference values greater than the preset voltage difference value absolute value is calculated, and the voltage fluctuation is determined based on the comparison result of the second proportion and the preset proportion.

[0095] It can be understood that when the first proportion is less than or equal to the preset proportion, the current fluctuation is stable, and when the second proportion is less than or equal to the preset proportion, the voltage fluctuation is stable.

[0096] It can be understood that the preset current difference value is the mean value of the absolute values of a plurality of historical current difference values, the preset voltage difference value is the mean value of the absolute values of a plurality of historical voltage difference values, and the preset proportion is 1 / 5.

[0097] It can be understood that the stable determination block is used to determine that the current transmission is stable when the current collection is uniform and the current change fluctuation is small, and vice versa.

[0098] When the voltage collection is uniform and the voltage change fluctuation is small, it is determined that the voltage transmission is stable, and vice versa.

[0099] It can be understood that the stable determination sub-unit is used to determine that the actual data transmission is stable when the current transmission is stable and the voltage transmission is stable.

[0100] Specifically, the interval monitoring block comprises:

[0101] The curve drawing sub-block is used to draw a current time interval change curve based on a plurality of current time intervals, and draw a voltage time interval change curve based on a plurality of voltage time intervals.

[0102] The uniformity determination sub-block is connected with the curve drawing sub-block, and is used to determine a plurality of slope values corresponding to a plurality of points on the current time interval change curve, and calculate the mean value of the absolute values of the plurality of slope values as the current uniformity.

[0103] And, determining a plurality of slope values corresponding to a plurality of points on the voltage moment interval variation curve, calculating the mean of the absolute values of the plurality of slope values as the voltage uniformity.

[0104] It can be understood that the current uniformity is compared with the preset current uniformity threshold value, when the current uniformity is less than or equal to the current uniformity threshold value, the current acquisition is uniform, otherwise, the current acquisition is not uniform;

[0105] The voltage uniformity is compared with the preset voltage uniformity threshold value, when the voltage uniformity is less than or equal to the voltage uniformity threshold value, the voltage acquisition is uniform, otherwise, the voltage acquisition is not uniform.

[0106] It can be understood that the preset current uniformity threshold value of the embodiment of the application is 0.3;

[0107] The preset voltage uniformity threshold value is 0.3.

[0108] Specifically, the adjusting subunit comprises:

[0109] Efficiency comparison block, used to compare the actual data transmission efficiency with the preset data transmission efficiency, obtain the efficiency comparison result, and determine the transmission efficiency stability based on the efficiency comparison result;

[0110] The number adjusting block is connected with the efficiency comparison block, and is used to adjust the initial connection number of the transmission channel interface when the transmission efficiency is unstable and the actual data transmission is stable

[0111] The replacement block is connected with the efficiency comparison block, and is used to replace the initial connection transmission channel interface based on the mechanical hand when the transmission efficiency is stable and the actual data transmission is unstable.

[0112] It can be understood that the number adjusting block of the embodiment of the application is used to increase the initial connection number of the transmission channel interface when the actual data transmission efficiency is less than the preset data transmission efficiency;

[0113] When the actual data transmission efficiency is greater than the preset data transmission efficiency, the initial connection number of the transmission channel interface is reduced;

[0114] When the actual data transmission efficiency is equal to the preset data transmission efficiency, the initial connection number of the transmission channel interface is not adjusted.

[0115] It can be understood that the preset data transmission efficiency of the embodiment of the application is the mean of a plurality of historical data transmission efficiencies in the acquisition history record.

[0116] Referring to Figure 4 The calculation unit 22 comprises:

[0117] The active power calculation subunit 221 is used to convert the real-time voltage values and the real-time current values into frequency domain signals, analyze the frequency domain signals to obtain the fundamental voltage and the fundamental current, determine the fundamental voltage effective value, the fundamental current effective value and the actual phase difference between the voltage and the current based on the fundamental voltage signal and the fundamental current signal, and further determine the actual active power;

[0118] The reactive power calculation subunit 222 is connected with the active power calculation subunit 221 and is used to determine the actual reactive power based on the analysis result of the frequency domain signal;

[0119] The compensation calculation subunit 223 is used to calculate the reactive power compensation target value based on the actual active power and the preset power factor target value, calculate the difference value between the actual reactive power and the reactive power compensation target value, and determine the actual reactive compensation amount based on the difference calculation result.

[0120] Specifically, the active power calculation subunit in the embodiment of the present application accurately calculates the actual active power, which provides a key reference for the subsequent formulation of the reactive power compensation strategy, ensures that the calculation of the reactive compensation amount does not deviate from the actual active load condition of the power grid, avoids excessive compensation or insufficient compensation, guarantees the economic and stable operation of the power grid, timely discovers the surplus or shortage of the reactive power through the reactive power calculation subunit, thereby providing a basis for accurately regulating the switching of the capacitor, effectively improves the power factor of the power grid, reduces the circulation of the reactive current in the power grid, reduces the line loss, and improves the power quality, and the compensation calculation subunit ensures that the switching action of the reactive power compensation device is appropriate, optimizes the power factor of the power grid to the maximum extent, reduces energy waste, and guarantees the efficient and stable operation of the power grid.

[0121] It can be understood that the calculation process of the active power calculation subunit in the embodiment of the present application to determine the fundamental voltage effective value, the fundamental current effective value and the actual phase difference between the voltage and the current is the prior art, which will not be described here. The calculation formula of the actual active power is the product of the fundamental voltage effective value, the fundamental current effective value and the actual phase difference between the voltage and the current.

[0122] It can be understood that the compensation calculation subunit in the embodiment of the present application calculates the actual reactive power by calculating the product sum of the voltage effective value, the current effective value and the phase difference corresponding to the n-th harmonic, and the formula is the prior art, which will not be described here.

[0123] It can be understood that the compensation calculation subunit in the embodiment of the present application compares and calculates the difference value between the actual reactive power and the reactive power compensation target value to determine the actual reactive compensation amount.

[0124] If the actual reactive compensation amount is greater than 0, it means that the actual reactive power is insufficient, and the reactive compensation amount needs to be increased. If the actual reactive compensation amount is less than 0, it means that the actual reactive power is excessive, and the reactive compensation amount needs to be reduced.

[0125] If the actual reactive power compensation amount is less than 0, it indicates that the actual reactive power is excessive, and the reactive power compensation amount needs to be reduced.

[0126] If the actual reactive power compensation amount is equal to 0, it indicates that the current reactive power is in a suitable state, and no reactive power compensation adjustment is needed.

[0127] Specifically, the instruction generation unit comprises:

[0128] A capacitor analysis subunit is configured to acquire historical input time lengths and historical switching times of the plurality of power capacitors, analyze the historical input time lengths and the historical switching times, sort the plurality of power capacitors based on the analysis results of the historical input time lengths and the historical switching times, and acquire a capacitor sorting result.

[0129] A switch analysis subunit is configured to acquire historical switching times, historical action time intervals, and real-time switching states of the plurality of intelligent switches, analyze the historical switching times, the historical action time intervals, and the real-time switching states, sort the plurality of intelligent switches based on the analysis results, and acquire a switch sorting result.

[0130] An instruction generation subunit is configured to determine a switch control strategy based on the actual reactive power compensation amount, the capacitor sorting result, and the switch sorting result, and generate a switch control instruction according to the switch control strategy.

[0131] It can be understood that the capacitor analysis subunit is configured to sort the plurality of historical input time lengths from large to small, sort the plurality of historical switching times from large to small, determine a capacitor sorting result based on the time length sorting result and the time sorting result, for example, if the time length sorting result corresponding to a plurality of power capacitors A, B, and C is 1, 2, and 3, and the time sorting result is 2, 3, and 1, then the sum of the two sorting results is 3, 5, and 4, respectively, and the final capacitor sorting result is A, C, and B.

[0132] It can be understood that the switch analysis subunit is configured to sort the plurality of historical switching times from large to small, sort the plurality of historical action time intervals from large to small, determine a switch sorting result based on the switching time sorting result and the interval sorting result, for example, if the time length sorting result corresponding to a plurality of intelligent switches D, E, and F is 2, 1, and 3, and the time sorting result is 2, 3, and 1, then the sum of the two sorting results is 4, 4, and 4, respectively, and the final capacitor sorting result is D, E, and F, and the real-time switching state of the plurality of intelligent switches D, E, and F is determined, if the reactive power compensation amount needs to be increased, then the switch is selected according to the sorting result of the opened intelligent switch, and if the reactive power compensation amount needs to be reduced, then the switch is selected according to the sorting result of the closed intelligent switch.

[0133] It can be understood that the instruction generation subunit determines the capacitor switching-in or switching-out amount based on the actual reactive power compensation amount, and selects the corresponding capacitor and the corresponding switch according to the capacitor switching-in or switching-out amount and the capacitor sorting result and the switch sorting result.

[0134] It can be understood that the switch control instruction of the embodiment of the application enables the control target to realize the corresponding control strategy action after the switch control strategy electric signal is transmitted.

[0135] Specifically, the adjustment unit comprises:

[0136] The parameter analysis subunit is configured to monitor a plurality of real-time input parameters input by the power grid in real time, draw a parameter change graph based on the plurality of real-time input parameters, analyze the parameter change graph to identify a parameter change trend and a parameter change amplitude, and determine actual parameter fluctuation stability.

[0137] The instruction adjustment subunit is connected with the parameter analysis subunit and is configured to adjust the switch control instruction according to the actual parameter fluctuation stability.

[0138] It can be understood that the adjustment unit is configured to start the adjustment mechanism quickly when it is determined that the power grid parameter fluctuates unstably. If the voltage fluctuates too much, the switching strategy of the capacitor bank closely associated with the voltage is adjusted preferentially in combination with the current power capacitor switching state, the action capability of the intelligent switch, and the real-time load demand of the power grid. For example, if the voltage is too low, the reactive power compensation capacity is appropriately increased, and those capacitors that have a short switching-in time and have an obvious voltage lifting effect are selected to be switched in operation preferentially. An emergency adjustment instruction is sent to the instruction generation unit to prompt the instruction generation unit to generate and issue corresponding switch control instructions quickly, to adjust the switching action and stabilize the power grid voltage. If the reactive power fluctuates abnormally, the historical operation data of each capacitor, the current reactive power compensation effect, and the future load trend of the power grid are comprehensively considered to re-plan a reactive power compensation scheme and dynamically adjust the combined switching-in mode of the capacitors, so as to ensure that the reactive power is restored to be stable in a short time and the power quality of the power grid is maintained at a good level.

[0139] Specifically, the parameter analysis subunit comprises:

[0140] The trend identification block is configured to analyze the parameter change graph by an exponential smoothing algorithm to determine a parameter change trend.

[0141] The amplitude evaluation block is configured to calculate a region proportion corresponding to an amplitude value exceeding a preset amplitude value in the parameter change graph.

[0142] The stability determination block is configured to determine actual parameter fluctuation stability based on the parameter change trend and the region proportion.

[0143] It can be understood that the trend identification block in the embodiment of the present application is used to apply the exponential smoothing algorithm to process a plurality of data in the parameter change graph, obtain a smoothed data sequence by calculating a weighted average value, if the overall data sequence shows an upward trend, the parameter is in an upward trend, if the overall data sequence shows a downward trend, the parameter is in a downward trend, and if the data sequence fluctuates within a certain range, the parameter remains stable.

[0144] It can be understood that the amplitude evaluation block in the embodiment of the present application is used to compare the area proportion with the preset proportion, if the area proportion is greater than the preset proportion, it indicates that the parameter fluctuation amplitude is large, and otherwise, it indicates that the parameter fluctuation amplitude is small.

[0145] It can be understood that the stability judgment block in the embodiment of the present application is used to determine stable fluctuation when the parameter trend is stable and the area proportion is small, and determine unstable fluctuation when the parameter trend is unstable or the area proportion is large.

[0146] So far, the technical solution of the present application has been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

[0147] The above is only the preferred embodiment of the present application, and is not used to limit the present application; for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A plug and play intelligent reactive power compensation device structure, characterized in that, The utility model relates to a kind of power compensation device, including: Box; Several power capacitors are arranged inside the box below, to compensate for grid reactive power; Several intelligent switches are arranged above several capacitors, and are connected with several power capacitors one by one, to determine switch opening or closing state according to control instruction; Voltage transformer is arranged on grid input wire, to detect real-time voltage value of grid input in real time; Current transformer is arranged on grid input wire, to detect real-time current value of grid input in real time; Controller, its surface is provided with several transmission channel interfaces, for any transmission channel interface, it is connected with voltage transformer and current transformer respectively, to receive several real-time voltage values and several real-time current values, analyze several real-time voltage values and several real-time current values, calculate actual reactive compensation based on parameter analysis result, to generate switch control instruction according to actual reactive compensation; And, real-time detection capacitance adjustment process parameter changes in real-time grid input, according to parameter variation adjustment switch control instruction; The controller includes: Transmission control unit, to determine actual data transmission efficiency and actual data transmission stability, based on actual data transmission efficiency and actual data transmission stability adjustment initial connection quantity of transmission channel interface, or, based on mechanical hand replacement initial connection transmission channel interface; Calculation unit, connected with the transmission control unit, to calculate actual active power and actual reactive power based on several real-time voltage values and several real-time current values, calculate reactive power compensation target value based on actual active power and preset power factor target value, compare actual reactive power with reactive power compensation target value, determine actual reactive compensation based on comparison result; Instruction generation unit, connected with the calculation unit, to determine switch closing strategy based on actual reactive compensation, to generate the switch control instruction according to switch closing strategy; Adjustment unit, connected with the instruction generation unit, to detect real-time grid input parameter changes in real-time capacitance adjustment process, according to parameter variation adjustment switch control instruction; The transmission control unit includes: Efficiency determination subunit, to collect real-time data flow at initial connection transmission channel interface and real-time acquisition time in real time, calculate actual data transmission efficiency of data transmission in unit time based on real-time acquisition time and real-time data flow; Stability determination subunit, to determine data acquisition uniformity and data acquisition volatility of several real-time current values and several real-time voltage values, to determine actual data transmission stability according to data acquisition uniformity and data acquisition volatility; Adjustment subunit, connected with the efficiency determination subunit and the stability determination subunit respectively, to determine transmission efficiency stability based on the comparison result of actual data transmission efficiency and preset data transmission efficiency, to determine initial connection quantity of transmission channel interface based on transmission efficiency stability and actual data transmission stability, or, based on mechanical hand replacement initial connection transmission channel interface; The calculation unit includes: An active power calculation subunit is configured to convert the real-time voltage values and the real-time current values into frequency domain signals, analyze the frequency domain signals to obtain fundamental voltage and fundamental current, determine fundamental voltage effective value, fundamental current effective value, and actual phase difference between the voltage and the current based on the fundamental voltage signal and the fundamental current signal, and further determine actual active power; A reactive power calculation subunit is connected with the active power calculation subunit and configured to determine actual reactive power based on the analysis result of the frequency domain signals; A compensation calculation subunit is configured to calculate reactive power compensation target value based on the actual active power and a preset power factor target value, calculate the difference between the actual reactive power and the reactive power compensation target value, and determine actual reactive compensation based on the difference calculation result; The instruction generation unit comprises: A capacitance analysis subunit is configured to obtain and analyze historical input duration and historical switching times of the power capacitors, sort the power capacitors based on the analysis result of the historical input duration and the historical switching times, and obtain capacitance sorting result; A switch analysis subunit is configured to obtain, analyze, and sort the historical switching times, historical action time intervals, and real-time opening and closing states of the intelligent switches, and obtain switch sorting result; An instruction generation subunit is configured to determine switch control strategy based on the actual reactive compensation, the capacitance sorting result, and the switch sorting result, and generate switch control instruction according to the switch control strategy; The adjustment unit comprises: A parameter analysis subunit is configured to monitor real-time input parameters input by the power grid in real time, plot parameter change graph based on the real-time input parameters, analyze the parameter change graph to identify the trend and amplitude of parameter change, and determine actual parameter fluctuation stability; An instruction adjustment subunit is connected with the parameter analysis subunit and configured to adjust the switch control instruction according to the actual parameter fluctuation stability.

2. The plug and play intelligent var compensator arrangement of claim 1, wherein, The stability determination subunit comprises: An interval monitoring block is configured to monitor current time corresponding to the real-time current values and voltage time corresponding to the real-time voltage values in real time, calculate current time interval and voltage time interval based on the current time and the voltage time respectively, and analyze the current time interval and the voltage time interval respectively to determine current uniformity and voltage uniformity; A fluctuation analysis block is configured to calculate the difference between real-time current values corresponding to adjacent current times, count absolute values of the real-time current differences and frequencies corresponding to the absolute values, and determine current fluctuation based on the absolute values and the analysis result of the absolute value frequencies; A stability determination block is configured to determine current transmission stability based on the current uniformity and the current fluctuation, and determine voltage transmission stability based on the voltage uniformity and the voltage fluctuation. The interval monitoring block comprises:

3. The plug and play intelligent var compensator arrangement of claim 2, wherein, ​ A curve drawing sub-block is configured to draw a current time interval change curve based on the current time intervals and draw a voltage time interval change curve based on the voltage time intervals; A uniformity determination sub-block is connected with the curve drawing sub-block and configured to determine a plurality of slope values corresponding to a plurality of points on the current time interval change curve, calculate a mean value of absolute values of the plurality of slope values as the current uniformity, determine a plurality of slope values corresponding to a plurality of points on the voltage time interval change curve, and calculate a mean value of absolute values of the plurality of slope values as the voltage uniformity. The adjustment sub-unit includes:

4. The plug and play intelligent var compensator arrangement of claim 3, wherein, An efficiency comparison block is configured to compare the actual data transmission efficiency with a preset data transmission efficiency, obtain an efficiency comparison result, and determine the transmission efficiency stability based on the efficiency comparison result; A quantity adjustment block is connected with the efficiency comparison block and configured to adjust an initial connection quantity of the transmission channel interface when the transmission efficiency is unstable and the actual data transmission is stable; A replacement block is connected with the efficiency comparison block and configured to replace the initial connected transmission channel interface based on the robot when the transmission efficiency is stable and the actual data transmission is unstable. The parameter analysis sub-unit includes:

5. The plug and play intelligent var compensator arrangement of claim 4, wherein, A trend identification block is configured to analyze the parameter change graph by an exponential smoothing algorithm to determine a parameter change trend; An amplitude evaluation block is configured to calculate a region proportion corresponding to a region exceeding a preset amplitude value in the parameter change graph; A stability determination block is configured to determine the actual parameter fluctuation stability based on the parameter change trend and the region proportion. ​

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