Plug-and-play intelligent reactive power compensation device structure

Abstract

The invention relates to the technical field of power electronics, in particular to a plug-and-play intelligent reactive power compensation device structure, which comprises a box body, power capacitors arranged at the lower part in the box body and used for compensating reactive power of a power grid, and intelligent switches arranged at the upper part in one-to-one correspondence with the capacitors and used for controlling the connection or disconnection of the capacitors, the power grid input wire is provided with a voltage transformer and a current transformer for monitoring the voltage and the current of the power grid in real time, the surface of the controller is provided with a plurality of transmission channel interfaces, and the plurality of transmission channel interfaces are respectively connected with the voltage transformer and the current transformer and are used for receiving a plurality of real-time voltage values and a plurality of real-time current values; analyzing the plurality of real-time voltage values and the plurality of real-time current values to calculate an actual reactive compensation amount, so as to generate a switch control instruction according to the actual reactive compensation amount; and the change condition of the real-time power grid input parameters in the capacitance adjustment process is detected in real time so as to adjust the switch control instruction. The stability of power grid operation is improved.

Description

Technical Field

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

[0002] In electricity consumption scenarios such as industrial production, a large number of inductive loads will consume a large amount of reactive power, resulting in a lower power factor, causing a considerable proportion of the electric energy transmitted by the power grid to be used to establish a magnetic field rather than do work, resulting in energy waste and increased line losses.

[0003] The patent document with Chinese patent application publication number CN115411744A discloses an intelligent reactive power compensation device, which includes a power input terminal for connecting to alternating current, a power output terminal for outputting alternating current 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, connecting the first phase line and the third phase line of the three-phase alternating current 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, connecting the second phase line and the first phase line of the three-phase alternating current 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, connecting the third phase line and the second phase line of the three-phase alternating current via the third solid-state switch.

[0004] The existing technology uses a zero-crossing trigger circuit combined with a solid-state switch and a relay control method. The timing of the zero-crossing trigger is relatively fixed, and it is difficult to flexibly and accurately adjust it according to the real-time complex reactive power requirements of the power grid, resulting in the power factor of the power grid cannot be stably maintained within the ideal range, causing unstable power grid operation. Summary of the invention

[0005] To this end, the present invention provides a plug-and-play intelligent reactive compensation device structure, which accurately calculates the actual reactive compensation amount through real-time voltage and current parameters, generates highly accurate switch control instructions, drives the intelligent switch to quickly and accurately switch on and off the power capacitor, and realizes the refined management of reactive compensation to solve the problem of unstable power grid operation.

[0006] To achieve the above object, the present invention provides a plug-and-play intelligent reactive power compensation device structure, comprising: Box; A number of power capacitors are arranged at the bottom of the box to compensate for the reactive power of the power grid; A plurality of intelligent switches are arranged above the plurality of capacitors and are connected to the plurality of power capacitors one by one, so as to determine the on or off state of the switches according to the control instructions; A voltage transformer is installed on the power grid input wire to detect the real-time voltage value of the power grid input in real time; The current transformer is installed on the power grid input wire to detect the real-time current value of the power grid input in real time; A controller, on the surface of which a plurality of transmission channel interfaces are arranged, and for any transmission channel interface, the controller is respectively connected to the voltage transformer and the current transformer, so as 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 a plurality of real-time current values, calculate the 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; Also, the changes of the real-time grid input parameters during the capacitor adjustment process are detected in real time, and the switch control instructions are adjusted according to the parameter changes.

[0007] Furthermore, the controller comprises: A transmission control unit, used to determine actual data transmission efficiency and actual data transmission stability, and adjust the initial connection quantity of the transmission channel interface based on the actual data transmission efficiency and actual data transmission stability, or replace the initially connected transmission channel interface based on the manipulator; a calculation unit connected to the transmission control unit, for calculating actual active power and actual reactive power based on a plurality of real-time voltage values ​​and a plurality of real-time current values, calculating a reactive power compensation target value based on the actual active power and a preset power factor target value, comparing the actual reactive power with the reactive power compensation target value, and determining an actual reactive compensation amount based on the comparison result; an instruction generating unit, connected to the calculating unit, for determining a switch closing strategy based on an actual reactive power compensation amount, so as to generate the switch control instruction according to the switch closing strategy; The adjustment unit is connected to the instruction generation unit and is used to detect the change of the real-time grid input parameters during the capacitance adjustment process in real time, and adjust the switch control instructions according to the parameter changes.

[0008] Furthermore, the transmission control unit includes: The efficiency determination subunit is used to collect the real-time data flow and the real-time collection time at the transmission channel interface of the initial connection in real time, and calculate the actual data transmission efficiency of the data transmission per unit time based on the real-time collection time and the real-time data flow; A stability determination subunit is used to determine the data acquisition uniformity and data acquisition volatility of a plurality of real-time current values ​​and a plurality of real-time voltage values, so as to determine the actual data transmission stability according to the data acquisition uniformity and data acquisition volatility; The adjustment subunit is respectively connected to the efficiency determination subunit and the stability determination subunit, and is used to determine the transmission efficiency stability based on the comparison result between the actual data transmission efficiency and the preset data transmission efficiency, and to adjust the initial connection number of the transmission channel interface based on the transmission efficiency stability and the actual data transmission stability, or to replace the initially connected transmission channel interface based on the robot.

[0009] Furthermore, the stability determination subunit includes: An interval monitoring block is used to monitor and collect the current moment corresponding to the real-time current value and the voltage moment corresponding to the real-time voltage value in real time, calculate a number of current moment intervals and a number of voltage moment intervals based on a number of current moments and a number of voltage moments, and analyze a number of current moment intervals and a number of voltage moment intervals to determine the current uniformity and the voltage uniformity; The fluctuation analysis block is used to calculate the difference between the real-time current values ​​corresponding to adjacent current moments, count the absolute values ​​of several real-time current differences and the frequencies corresponding to the absolute values, and determine the current fluctuation based on the absolute value and absolute value frequency analysis results; and, calculating the difference between real-time voltage values ​​corresponding to adjacent voltage moments, counting absolute values ​​of a number of real-time voltage differences and frequencies corresponding to the absolute values, and determining voltage volatility based on the absolute value and absolute value frequency analysis results; The stability determination block is used to determine the current transmission stability based on the current uniformity and the current fluctuation, and to determine the voltage transmission stability based on the voltage uniformity and the voltage fluctuation.

[0010] Furthermore, the interval monitoring block includes: A curve drawing sub-block, used for drawing a current time interval variation curve based on a plurality of the current time intervals, and drawing a voltage time interval variation curve based on a plurality of the voltage time intervals; A uniformity determination sub-block, connected to the curve drawing sub-block, is used to determine a number of slope values ​​corresponding to a number of points on the current time interval change curve, and calculate the average of the absolute values ​​of the number of slope values ​​as the current uniformity; Furthermore, a plurality of slope values ​​corresponding to a plurality of points on the voltage time interval variation curve are determined, and an average of the absolute values ​​of the plurality of slope values ​​is calculated as the voltage uniformity.

[0011] Furthermore, the adjustment subunit includes: An efficiency comparison block, used 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; The quantity adjustment block is connected to the efficiency comparison block and is used to adjust the initial connection quantity of the transmission channel interface when the transmission efficiency is unstable and the actual data transmission is stable.

[0012] The replacement block is connected to the efficiency comparison block and is used to replace the transmission channel interface of the initial connection based on the robot when the transmission efficiency is stable and the actual data transmission is unstable.

[0013] Furthermore, the calculation unit comprises: an active power calculation subunit, 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 the fundamental voltage and the fundamental current, determine the fundamental voltage effective value, the fundamental current effective value and the actual phase difference corresponding to the voltage and the current based on the fundamental voltage signal and the fundamental current signal, and further determine the actual active power; A reactive power calculation subunit, connected to the active power calculation subunit, for determining actual reactive power based on the analysis result of the frequency domain signal; The compensation calculation subunit is used to calculate the reactive power compensation target value based on the actual active power and the preset power factor target value, perform difference calculation between the actual reactive power and the reactive power compensation target value, and determine the actual reactive power compensation amount based on the difference calculation result.

[0014] Furthermore, the instruction generation unit includes: A capacitance analysis subunit, used to obtain and analyze the historical operation time and the historical switching times of the plurality of power capacitors, sort the plurality of power capacitors based on the historical operation time and the historical analysis results, and obtain capacitance sorting results; A switch analysis subunit, used to obtain the historical opening and closing times, historical action time intervals and real-time opening and closing states of the plurality of intelligent switches, analyze the historical opening and closing times, historical action time intervals and real-time opening and closing states, sort the plurality of intelligent switches based on the analysis results, and obtain a switch sorting result; The instruction generation subunit is used to determine the switch control strategy based on the actual reactive power compensation amount, the capacitor sorting result and the switch sorting result, and generate the switch control instruction according to the switch control strategy.

[0015] Furthermore, the adjustment unit includes: A parameter analysis subunit is used to monitor several real-time input parameters of the power grid input in real time, draw a parameter change graph based on the several real-time input parameters, and analyze the parameter change graph to identify the trend and amplitude of the parameter change to determine the actual parameter fluctuation stability; The instruction adjustment subunit is connected to the parameter analysis subunit and is used to adjust the switch control instruction according to the actual parameter fluctuation stability.

[0016] Furthermore, the parameter analysis subunit includes: The trend identification block is used to analyze the parameter change graph through the exponential smoothing algorithm to determine the parameter change trend; The amplitude evaluation block is used to calculate the area ratio corresponding to the value exceeding the preset amplitude in the parameter change diagram; The stability determination block is used to determine the stability of actual parameter fluctuations based on parameter change trends and regional proportions.

[0017] Compared with the prior art, the beneficial effects of the present invention are that, by setting a box to provide physical protection for the internal power capacitors, intelligent switches, and key controller components, by setting a number of precise reactive power injection or absorption into the power grid, 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, and the efficiency of power transmission is improved. By setting a number of intelligent switches, according to the precise control instructions issued by the controller, the capacitor can be quickly and accurately put into and removed. The intelligent switch has an extremely fast response speed, and can track the dynamic changes of the reactive power of the power grid in time. When the reactive demand of the power grid changes instantly, the capacitor switching state is quickly adjusted to ensure reactive compensation and timely. Timeliness and accuracy ensure the stable operation of the reactive power compensation system. By setting up voltage transformers and current transformers, the voltage and current values ​​of the power grid input are detected in real time and with high precision, providing a reliable data basis for subsequent reactive power calculation and compensation control. By setting up the transmission channel interface on the surface of the controller, high-speed and stable data interaction with each detection component is ensured, and the timeliness of real-time data collection is realized. By conducting in-depth analysis of the received real-time voltage and current values, the actual reactive compensation amount is accurately calculated, the switch control instructions are dynamically adjusted according to the parameters, and the load changes of the power grid are adaptively adjusted to ensure that the reactive compensation effect is always in the best state, maintaining stable and efficient operation of the power grid.

[0018] In particular, by setting the transmission control unit to monitor the data flow and collection time at the transmission channel interface in real time, the actual data transmission efficiency per unit time is accurately calculated, and at the same time, the data collection uniformity and volatility of the real-time current value and voltage value are deeply analyzed to determine the actual data transmission stability, ensure that the data can be delivered to the controller for processing in a timely and complete manner, avoid reactive compensation delays or errors caused by data transmission problems, and ensure the real-time and accuracy of the entire system. By setting the calculation unit to accurately calculate the reactive power compensation target value and the actual reactive compensation amount, the supply and demand gap of the reactive power of the power grid is accurately quantified, providing an indispensable basis for subsequent accurate compensation, ensuring that the switching action of the capacitor is targeted, avoiding energy waste or deterioration of power quality caused by blind compensation, and effectively improving the operation economy and stability of the power grid. By setting the instruction generation unit to generate a switch control instruction, accurate and efficient control of capacitor switching is achieved, ensuring the timeliness and reliability of reactive compensation of the power grid, and maintaining stable operation of the power grid. By setting the adjustment unit to accurately determine the actual parameter fluctuation stability, dynamically adjust the capacitor combination input mode, re-plan the reactive compensation strategy, and improve the reliability and adaptability of power grid operation.

[0019] In particular, by setting the efficiency determination subunit to accurately collect the real-time data flow at the transmission channel interface of the initial connection and the corresponding real-time collection time to determine the actual efficiency of data transmission, it is ensured that the controller can quickly obtain the latest power grid data, adjust the reactive compensation strategy in time, maintain the stability of the power grid, avoid over-compensation or under-compensation problems caused by data delays, and improve the real-time and accuracy of the entire reactive compensation device. By setting the stability determination subunit, the stability of the controller receiving data is ensured, potential data risks are identified, the quality of data entering the calculation unit is guaranteed, the reliability of the reactive compensation system operation is improved, and power grid operation failures caused by data anomalies are reduced. By setting the adjustment subunit to set a dynamic and flexible adjustment mechanism, the data transmission is always maintained in an efficient and stable state, so that the device can accurately and timely respond to changes in the reactive power of the power grid and ensure the power quality of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a plug-and-play intelligent reactive power compensation device provided by an embodiment of the present invention; Figure 2 A structural block diagram of a controller in a plug-and-play intelligent reactive power compensation device structure provided by an embodiment of the present invention; Figure 3 A structural block diagram of a transmission control unit in a plug-and-play intelligent reactive power compensation device structure provided by an embodiment of the present invention; Figure 4 A structural block diagram of a computing unit in a plug-and-play intelligent reactive power compensation device structure provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0023] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely 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. Therefore, it should not be understood as a limitation on the present invention.

[0024] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] See also Figure 1 As shown, an embodiment of the present invention provides a plug-and-play intelligent reactive power compensation device structure, including: Box 1; A plurality of power capacitors 7 are arranged at the lower part of the box body to compensate for the reactive power of the power grid; A plurality of intelligent switches 6 are arranged above the plurality of capacitors and are connected one by one with the plurality of power capacitors to determine the switch on or off state according to the control instruction; The voltage transformer 5 is arranged on the power grid input wire to detect the real-time voltage value of the power grid input in real time; The current transformer 4 is arranged on the power grid input wire to detect the real-time current value of the power grid input in real time; A controller 2, on the surface of which a plurality of transmission channel interfaces 3 are arranged, and for any transmission channel interface, it is respectively connected to a voltage transformer and a current transformer, so as 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 a plurality of real-time current values, calculate the 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; Also, the changes of the real-time grid input parameters during the capacitor adjustment process are detected in real time, and the switch control instructions are adjusted according to the parameter changes.

[0026] It is understandable that the embodiment of the present invention also includes a robot 8 .

[0027] It is understandable that the embodiments of the present invention also include that each functional unit inside the device is connected through a standardized plug-in and interface to achieve a plug-and-play function. The plug-in adopts a plug-in design, has good contact performance and mechanical stability, and is convenient for installation, removal and replacement. The interface circuit has functions such as electrical isolation, filtering, and lightning protection to ensure the accuracy and reliability of signal transmission.

[0028] It can be understood that the box body of the embodiment of the present invention is made of a sturdy and durable material with certain electromagnetic shielding properties, such as galvanized steel plate or aluminum alloy, which can not only ensure the normal operating environment of the internal electronic components, prevent short circuits caused by dust accumulation, corrosion damage caused by moisture erosion and other problems, but also reduce the impact of external electromagnetic interference on the device control signal and detection signal, ensure the stability and reliability of the device operation, extend the overall service life of the equipment, and reduce operation and maintenance costs.

[0029] Specifically, the embodiment of the present invention provides physical protection for the power capacitors, intelligent switches, and key controller components inside the box, and accurately injects or absorbs reactive power into the power grid, thereby effectively improving the power factor of the power grid, reducing the transmission of reactive current on the line, reducing line losses, and improving the efficiency of power transmission. By setting a number of intelligent switches, the capacitor can be quickly and accurately put into and removed according to the precise control instructions issued by the controller. The intelligent switch has an extremely fast response speed, and can track the dynamic changes of the reactive power of the power grid in a timely manner. When the reactive demand of the power grid changes instantly, the capacitor switching state can be quickly adjusted to ensure the timeliness and accuracy of reactive compensation. Accuracy ensures the stable operation of the reactive power compensation system. By setting up voltage transformers and current transformers, the voltage and current values ​​of the power grid input are detected in real time and with high precision, providing a reliable data basis for subsequent reactive power calculation and compensation control. By setting up a transmission channel interface on the surface of the controller, high-speed and stable data interaction with each detection component is ensured, and the timeliness of real-time data collection is realized. By conducting in-depth analysis of the received real-time voltage and current values, the actual reactive power compensation amount is accurately calculated, and the switch control instructions are dynamically adjusted according to the parameters. The load changes of the adaptive power grid ensure that the reactive power compensation effect is always in the best state and maintain the stable and efficient operation of the power grid. The plug-and-play intelligent reactive power compensation device structure provided by the embodiment of the present invention can be used for large-scale power grid security and defense systems.

[0030] See also Figure 2 As shown, the controller 2 includes: A transmission control unit 21, used to determine actual data transmission efficiency and actual data transmission stability, and adjust the initial connection quantity of the transmission channel interface based on the actual data transmission efficiency and actual data transmission stability, or replace the initially connected transmission channel interface based on the manipulator 8; a calculation unit 22 connected to the transmission control unit 21, for calculating actual active power and actual reactive power based on a plurality of real-time voltage values ​​and a plurality of real-time current values, calculating a reactive power compensation target value based on the actual active power and a preset power factor target value, comparing the actual reactive power with the reactive power compensation target value, and determining an actual reactive compensation amount based on the comparison result; An instruction generating unit 23, connected to the calculating unit 22, for determining a switch closing strategy based on an actual reactive power compensation amount, so as to generate the switch control instruction according to the switch closing strategy; The adjustment unit 24 is connected to the instruction generation unit 23 and is used to detect the change of the real-time grid input parameters during the capacitance adjustment process in real time, and adjust the switch control instructions according to the parameter changes.

[0031] Specifically, the embodiment of the present invention sets the transmission control unit to monitor the data flow and collection time at the transmission channel interface in real time, accurately calculates the actual data transmission efficiency per unit time, and deeply analyzes the data collection uniformity and volatility of the real-time current value and voltage value, so as to determine the actual data transmission stability, ensure that the data can be delivered to the controller for processing in a timely and complete manner, avoid reactive compensation delays or errors caused by data transmission problems, and ensure the real-time and accuracy of the entire system. By setting the calculation unit to accurately calculate the reactive power compensation target value and the actual reactive compensation amount, the supply and demand gap of the reactive power of the power grid is accurately quantified, and an indispensable basis is provided for subsequent precise compensation, ensuring that the switching action of the capacitor is targeted, avoiding energy waste or deterioration of power quality caused by blind compensation, and effectively improving the operation economy and stability of the power grid. By setting the instruction generation unit to generate a switch control instruction, accurate and efficient control of capacitor switching is achieved, ensuring the timeliness and reliability of reactive compensation of the power grid, and maintaining stable operation of the power grid, the adjustment unit is set to accurately determine the actual parameter fluctuation stability, dynamically adjust the capacitor combination input mode, re-plan the reactive compensation strategy, and improve the reliability and adaptability of power grid operation.

[0032] It can be understood that the power factor target value of the embodiment of the present invention is usually set between 0.9-0.95 for general industrial power grids; for fields such as precision electronic manufacturing that have strict requirements on power quality, the target value may be higher, close to 1. In the embodiment of the present invention, the power factor target value is set to 0.9.

[0033] See also Figure 3As shown, the transmission control unit 21 includes: The efficiency determination subunit 211 is used to collect the real-time data flow and the real-time collection time at the transmission channel interface of the initial connection in real time, and calculate the actual data transmission efficiency of the data transmission per unit time based on the real-time collection time and the real-time data flow; A stability determination subunit 212, used to determine the data acquisition uniformity and data acquisition volatility of a plurality of real-time current values ​​and a plurality of real-time voltage values, so as to determine the actual data transmission stability according to the data acquisition uniformity and data acquisition volatility; The adjustment subunit 213 is connected to the efficiency determination subunit 211 and the stability determination subunit 212, respectively, and is used to determine the transmission efficiency stability based on the comparison result between the actual data transmission efficiency and the preset data transmission efficiency, and to adjust the initial connection number of the transmission channel interface based on the transmission efficiency stability and the actual data transmission stability, or to replace the initially connected transmission channel interface based on the manipulator.

[0034] Specifically, the embodiment of the present invention sets an efficiency determination subunit to accurately collect the real-time data flow at the transmission channel interface of the initial connection and the corresponding real-time collection time to determine the actual efficiency of data transmission, thereby ensuring that the controller can quickly obtain the latest power grid data, timely adjust the reactive compensation strategy, maintain power grid stability, avoid over-compensation or under-compensation problems caused by data delays, and improve the real-time and accuracy of the entire reactive compensation device. By setting the stability determination subunit, the stability of the controller receiving data is ensured, potential data risks are identified, the quality of data entering the calculation unit is guaranteed, the reliability of the reactive compensation system operation is improved, and power grid operation failures caused by data anomalies are reduced. By setting the adjustment subunit, a dynamic and flexible adjustment mechanism is set to always maintain data transmission in an efficient and stable state, so that the device can accurately and timely respond to changes in the reactive power of the power grid and ensure the power quality of the power grid.

[0035] It can be understood that the actual data transmission flow collected by the efficiency determination subunit in the embodiment of the present invention may be collected through a flow sensor.

[0036] It can be understood that the efficiency determination subunit described in the embodiment of the present invention can calculate the average of the real-time data flow differences corresponding to several adjacent collection moments as the actual data transmission efficiency. For example, the actual collection moments are a, b, and c, respectively, where the actual data flow value corresponding to moment a is Qa, the actual data flow value corresponding to moment b is Qb, and the actual data flow value corresponding to moment c is Qc, then the actual data transmission efficiency E=1 / 2×((|Qb-Qa|) / (|ba|)+(|Qc-Qb|) / |cb|).

[0037] Specifically, the stability determination subunit includes: An interval monitoring block is used to monitor and collect the current moment corresponding to the real-time current value and the voltage moment corresponding to the real-time voltage value in real time, calculate a number of current moment intervals and a number of voltage moment intervals based on a number of current moments and a number of voltage moments, and analyze a number of current moment intervals and a number of voltage moment intervals to determine the current uniformity and the voltage uniformity; The fluctuation analysis block is used to calculate the difference between the real-time current values ​​corresponding to adjacent current moments, count the absolute values ​​of several real-time current differences and the frequencies corresponding to the absolute values, and determine the current fluctuation based on the absolute value and absolute value frequency analysis results; and, calculating the difference between real-time voltage values ​​corresponding to adjacent voltage moments, counting absolute values ​​of a number of real-time voltage differences and frequencies corresponding to the absolute values, and determining voltage volatility based on the absolute value and absolute value frequency analysis results; The stability determination block is used to determine the current transmission stability based on the current uniformity and the current fluctuation, and to determine the voltage transmission stability based on the voltage uniformity and the voltage fluctuation.

[0038] It can be understood that the current volatility described in the embodiment of the present invention can be to calculate the absolute value of the real-time current difference of the real-time current values ​​corresponding to adjacent current moments, count the frequencies corresponding to the absolute values ​​of several real-time current differences, calculate the first proportion of the absolute values ​​of several real-time current differences being greater than the absolute value of the preset current difference, and determine the current volatility based on the comparison result of the first proportion and the preset proportion; The voltage volatility may be obtained by calculating the absolute value of the real-time voltage difference between the real-time voltage values ​​corresponding to adjacent voltage moments, counting the frequencies corresponding to the absolute values ​​of several real-time voltage differences, calculating a second proportion of the absolute values ​​of several real-time voltage differences being greater than the absolute value of a preset voltage difference, and determining the voltage volatility based on a comparison result between the second proportion and the preset proportion.

[0039] It can be understood that, in the embodiment of the present invention, 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.

[0040] It can be understood that the preset current difference value in the embodiment of the present invention is the average of the absolute values ​​of several historical current differences, the preset voltage difference value is the average of the absolute values ​​of several historical voltage differences, and the preset proportion is 1 / 5.

[0041] It can be understood that the stability determination block described in the embodiment of the present invention is used to determine that the current transmission is stable when the current collection is uniform and the current change fluctuation is small, otherwise, the current transmission is unstable; When the voltage is collected evenly and the voltage variation fluctuation is small, it is determined that the voltage transmission is stable. Otherwise, the voltage transmission is unstable.

[0042] It can be understood that the stability determination subunit described in the embodiment of the present invention is used to determine that the actual data transmission is stable when the current transmission is stable and the voltage transmission is stable.

[0043] Specifically, the interval monitoring block includes: A curve drawing sub-block, used for drawing a current time interval variation curve based on a plurality of the current time intervals, and drawing a voltage time interval variation curve based on a plurality of the voltage time intervals; A uniformity determination sub-block, connected to the curve drawing sub-block, is used to determine a number of slope values ​​corresponding to a number of points on the current time interval change curve, and calculate the average of the absolute values ​​of the number of slope values ​​as the current uniformity; Furthermore, a plurality of slope values ​​corresponding to a plurality of points on the voltage time interval variation curve are determined, and an average of the absolute values ​​of the plurality of slope values ​​is calculated as the voltage uniformity.

[0044] It can be understood that the embodiment of the present invention compares the current uniformity with a preset current uniformity threshold. When the current uniformity is less than or equal to the current uniformity threshold, the current is collected uniformly, otherwise, the current is collected unevenly. The voltage uniformity is compared with a preset voltage uniformity threshold. When the voltage uniformity is less than or equal to the voltage uniformity threshold, the voltage is collected uniformly; otherwise, the voltage is collected unevenly.

[0045] It can be understood that the current uniformity threshold preset in the embodiment of the present invention is 0.3; The preset voltage uniformity threshold is 0.3.

[0046] Specifically, the adjustment subunit includes: An efficiency comparison block, used 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; The quantity adjustment block is connected to the efficiency comparison block and is used to adjust the initial connection quantity of the transmission channel interface when the transmission efficiency is unstable and the actual data transmission is stable.

[0047] The replacement block is connected to the efficiency comparison block and is used to replace the transmission channel interface of the initial connection based on the robot when the transmission efficiency is stable and the actual data transmission is unstable.

[0048] It can be understood that the quantity adjustment block in the embodiment of the present invention is used to increase the initial connection quantity of the transmission channel interface when the actual data transmission efficiency is less than the preset data transmission efficiency; When the actual data transmission efficiency is greater than the preset data transmission efficiency, the initial connection quantity of the transmission channel interface is reduced; When the actual data transmission efficiency is equal to the preset data transmission efficiency, the initial connection quantity of the transmission channel interface is not adjusted.

[0049] It can be understood that the preset data transmission efficiency in the embodiment of the present invention is an average value of several historical data transmission efficiencies in the collected historical records.

[0050] See also Figure 4 As shown, the calculation unit 22 includes: an active power calculation subunit 221, 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 the fundamental voltage and the fundamental current, determine the fundamental voltage effective value, the fundamental current effective value and the actual phase difference corresponding to the voltage and the current based on the fundamental voltage signal and the fundamental current signal, and further determine the actual active power; A reactive power calculation subunit 222, connected to the active power calculation subunit 221, for determining actual reactive power based on the analysis result of the frequency domain signal; 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, perform difference calculation 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.

[0051] Specifically, the embodiment of the present invention provides a key reference benchmark for the formulation of subsequent reactive compensation strategies by setting an active power calculation subunit to accurately calculate the actual active power, ensuring that the calculation of the reactive compensation amount will not deviate from the actual active load condition of the power grid, avoiding over-compensation or under-compensation, and ensuring the economic and stable operation of the power grid. By setting the reactive power calculation subunit, it is possible to timely discover the surplus or shortage of reactive power, thereby providing a basis for accurately regulating the switching of capacitors, effectively improving the power factor of the power grid, reducing the circulation of reactive current in the power grid, reducing line losses, and improving the quality of electric energy. By setting the compensation calculation subunit, it is ensured that the switching action of the reactive compensation device is just right, the power factor of the power grid is optimized to the greatest extent, energy waste is reduced, and efficient and stable operation of the power grid is ensured.

[0052] It can be understood that the calculation process of the active power calculation subunit in the embodiment of the present invention to determine the effective value of the fundamental voltage, the effective value of the fundamental current and the actual phase difference corresponding to the voltage and current is the prior art and will not be repeated here. The calculation formula of the actual active power is the product of the effective value of the fundamental voltage, the effective value of the fundamental current and the actual phase difference corresponding to the voltage and current.

[0053] It can be understood that the compensation calculation subunit described in the embodiment of the present invention calculates the actual reactive power by calculating the product and the sum of the voltage effective value, current effective value and phase difference corresponding to the nth harmonic. The formula is the existing technology and will not be repeated here.

[0054] It can be understood that the embodiment of the present invention compares the actual reactive power with the reactive power compensation target value to calculate the difference and determine the actual reactive power compensation amount: If the actual reactive power compensation amount is greater than 0, it means that the actual reactive power is insufficient and the reactive power compensation amount needs to be increased. The actual reactive power compensation amount is .

[0055] If the actual reactive power compensation amount is less than 0, it means that the actual reactive power is excessive and the reactive power compensation amount needs to be reduced. At this time, the actual reactive power compensation amount is.

[0056] If the actual reactive power compensation amount is equal to 0, it means that the current reactive power is in a suitable state and no reactive power compensation adjustment is required.

[0057] Specifically, the instruction generation unit includes: A capacitance analysis subunit is used to obtain and analyze the historical operation time and the historical switching times of the plurality of power capacitors, and to sort the plurality of power capacitors based on the historical operation time and the historical analysis results to obtain a capacitance sorting result; A switch analysis subunit, used to obtain the historical opening and closing times, historical action time intervals and real-time opening and closing states of the plurality of intelligent switches, analyze the historical opening and closing times, historical action time intervals and real-time opening and closing states, sort the plurality of intelligent switches based on the analysis results, and obtain a switch sorting result; The instruction generation subunit is used to determine the switch control strategy based on the actual reactive power compensation amount, the capacitor sorting result and the switch sorting result, and generate the switch control instruction according to the switch control strategy.

[0058] It can be understood that the capacitance analysis subunit described in the embodiment of the present invention is used to sort several historical input durations from large to small, and sort several historical switching times from large to small, and determine the capacitance sorting result based on the duration sorting result and the number sorting result. For example, the duration sorting results corresponding to several power capacitors A, B, and C are 1, 2, and 3, and the number sorting results are 2, 3, and 1. The sum of the two sorting results is calculated to be 3, 5, and 4 respectively, and the final capacitance sorting result is A, C, and B.

[0059] It can be understood that the switch analysis subunit described in the embodiment of the present invention is used to sort several historical opening and closing times from large to small, and sort several historical action time intervals from large to small, and determine the switch sorting result based on the opening and closing times sorting result and the interval sorting result. For example, the duration sorting results corresponding to several intelligent switches D, E, and F are 2, 1, and 3, and the number sorting results are 2, 3, and 1. Then the sum of the two sorting results is calculated to be 4, 4, and 4 respectively. The final capacitance sorting result is D, E, and F in parallel, and the real-time opening and closing status of several intelligent switches D, E, and F is determined. If the reactive compensation amount needs to be increased, the switch selection is performed according to the sorting result of the opened intelligent switch. If the reactive compensation amount needs to be reduced, the switch selection is performed according to the sorting result of the closed intelligent switch.

[0060] It can be understood that the instruction generation subunit described in the embodiment of the present invention is used to determine the capacitor cutting-in or cutting-out amount based on the actual reactive compensation amount, and select the corresponding capacitor and the corresponding switch according to the capacitor cutting-in or cutting-out amount and the capacitor sorting result and the switch sorting result.

[0061] It can be understood that the switch control instruction in the embodiment of the present invention is a switch control strategy electrical signal that enables the control target to implement the corresponding control strategy action after it is transmitted.

[0062] Specifically, the adjustment unit includes: A parameter analysis subunit is used to monitor several real-time input parameters of the power grid input in real time, draw a parameter change graph based on the several real-time input parameters, and analyze the parameter change graph to identify the trend and amplitude of the parameter change to determine the actual parameter fluctuation stability; The instruction adjustment subunit is connected to the parameter analysis subunit and is used to adjust the switch control instruction according to the actual parameter fluctuation stability.

[0063] It can be understood that the adjustment unit described in the embodiment of the present invention is used to quickly start the adjustment mechanism when it is determined that unstable fluctuations in the grid parameters are detected. If the voltage fluctuation is too large, combined with the current switching state of the power capacitor, the action capability of the intelligent switch and the real-time load demand of the grid, the switching strategy of the capacitor group closely related to the voltage is adjusted first. For example, if the voltage is low, the reactive compensation capacity is appropriately increased, and those capacitors with a short time of operation and obvious voltage boosting effect are selected to be put into operation first. By sending an emergency adjustment instruction to the instruction generation unit, it is prompted to quickly generate and issue the corresponding switch control instruction, adjust the switching action, and stabilize the grid voltage. If the reactive power fluctuation is abnormal, comprehensively consider the historical operation data of each capacitor, the current reactive power compensation effect and the future load trend of the grid, re-plan the reactive compensation plan, dynamically adjust the combined input method of the capacitor, ensure that the reactive power is restored to stability in a short time, and maintain the power quality of the grid at a good level.

[0064] Specifically, the parameter analysis subunit includes: The trend identification block is used to analyze the parameter change graph through the exponential smoothing algorithm to determine the parameter change trend; The amplitude evaluation block is used to calculate the area ratio corresponding to the value exceeding the preset amplitude in the parameter change diagram; The stability determination block is used to determine the stability of actual parameter fluctuations based on parameter change trends and regional proportions.

[0065] It can be understood that the trend identification block described in the embodiment of the present invention is used to apply an exponential smoothing algorithm to process a number of data in the parameter change diagram, and obtain a smoothed data sequence by calculating a weighted average. If the data sequence is on an upward trend as a whole, the parameter is on an upward trend; if the data sequence is on a downward trend as a whole, the parameter is on a downward trend; if the data sequence fluctuates within a certain range, the parameter remains stable.

[0066] It can be understood that the amplitude evaluation block described in the embodiment of the present invention is used to compare the area proportion with the preset proportion. If the area proportion is greater than the preset proportion, it means that the parameter fluctuation amplitude is large; otherwise, it means that the parameter fluctuation amplitude is small.

[0067] It can be understood that the stability judgment block described in the embodiment of the present invention is used to judge it as stable fluctuation when the parameter trend is stable and the area accounts for a small proportion; when the parameter trend is unstable or the area accounts for a large proportion, it is judged as unstable fluctuation.

[0068] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A plug-and-play intelligent reactive power compensation device structure, characterized in that: include: Box; A number of power capacitors are arranged at the bottom of the box to compensate for the reactive power of the power grid; A plurality of intelligent switches are arranged above the plurality of capacitors and are connected to the plurality of power capacitors one by one, so as to determine the on or off state of the switches according to the control instructions; A voltage transformer is installed on the power grid input wire to detect the real-time voltage value of the power grid input in real time; The current transformer is installed on the power grid input wire to detect the real-time current value of the power grid input in real time; A controller, on the surface of which a plurality of transmission channel interfaces are arranged, and for any transmission channel interface, the controller is respectively connected to the voltage transformer and the current transformer, so as 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 a plurality of real-time current values, calculate the 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; Also, the changes of the real-time grid input parameters during the capacitor adjustment process are detected in real time, and the switch control instructions are adjusted according to the parameter changes.

2. The plug-and-play intelligent reactive power compensation device structure according to claim 1 is characterized in that: The controller comprises: A transmission control unit, used to determine actual data transmission efficiency and actual data transmission stability, and adjust the initial connection quantity of the transmission channel interface based on the actual data transmission efficiency and actual data transmission stability, or replace the initially connected transmission channel interface based on the manipulator; a calculation unit connected to the transmission control unit, for calculating actual active power and actual reactive power based on a plurality of real-time voltage values ​​and a plurality of real-time current values, calculating a reactive power compensation target value based on the actual active power and a preset power factor target value, comparing the actual reactive power with the reactive power compensation target value, and determining an actual reactive compensation amount based on the comparison result; an instruction generating unit, connected to the calculating unit, for determining a switch closing strategy based on an actual reactive power compensation amount, so as to generate the switch control instruction according to the switch closing strategy; The adjustment unit is connected to the instruction generation unit and is used to detect the change of the real-time grid input parameters during the capacitance adjustment process in real time, and adjust the switch control instructions according to the parameter changes.

3. The plug-and-play intelligent reactive power compensation device structure according to claim 2 is characterized in that: The transmission control unit comprises: The efficiency determination subunit is used to collect the real-time data flow and the real-time collection time at the transmission channel interface of the initial connection in real time, and calculate the actual data transmission efficiency of the data transmission per unit time based on the real-time collection time and the real-time data flow; A stability determination subunit is used to determine the data acquisition uniformity and data acquisition volatility of a plurality of real-time current values ​​and a plurality of real-time voltage values, so as to determine the actual data transmission stability according to the data acquisition uniformity and data acquisition volatility; The adjustment subunit is respectively connected to the efficiency determination subunit and the stability determination subunit, and is used to determine the transmission efficiency stability based on the comparison result between the actual data transmission efficiency and the preset data transmission efficiency, and to adjust the initial connection number of the transmission channel interface based on the transmission efficiency stability and the actual data transmission stability, or to replace the initially connected transmission channel interface based on the robot.

4. The plug-and-play intelligent reactive power compensation device structure according to claim 3 is characterized in that: The stability determination subunit comprises: An interval monitoring block is used to monitor and collect the current moment corresponding to the real-time current value and the voltage moment corresponding to the real-time voltage value in real time, calculate a number of current moment intervals and a number of voltage moment intervals based on a number of current moments and a number of voltage moments, and analyze a number of current moment intervals and a number of voltage moment intervals to determine the current uniformity and the voltage uniformity; The fluctuation analysis block is used to calculate the difference between the real-time current values ​​corresponding to adjacent current moments, count the absolute values ​​of several real-time current differences and the frequencies corresponding to the absolute values, and determine the current fluctuation based on the absolute value and absolute value frequency analysis results; and, calculating the difference between real-time voltage values ​​corresponding to adjacent voltage moments, counting absolute values ​​of a number of real-time voltage differences and frequencies corresponding to the absolute values, and determining voltage volatility based on the absolute value and absolute value frequency analysis results; The stability determination block is used to determine the current transmission stability based on the current uniformity and the current fluctuation, and to determine the voltage transmission stability based on the voltage uniformity and the voltage fluctuation.

5. The plug-and-play intelligent reactive power compensation device structure according to claim 4 is characterized in that: The interval monitoring block includes: A curve drawing sub-block, used for drawing a current time interval variation curve based on a plurality of the current time intervals, and drawing a voltage time interval variation curve based on a plurality of the voltage time intervals; A uniformity determination sub-block, connected to the curve drawing sub-block, is used to determine a number of slope values ​​corresponding to a number of points on the current time interval change curve, and calculate the average of the absolute values ​​of the number of slope values ​​as the current uniformity; Furthermore, a plurality of slope values ​​corresponding to a plurality of points on the voltage time interval variation curve are determined, and an average of the absolute values ​​of the plurality of slope values ​​is calculated as the voltage uniformity.

6. The plug-and-play intelligent reactive power compensation device structure according to claim 5 is characterized in that: The adjustment subunit comprises: An efficiency comparison block, used 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, connected to the efficiency comparison block, for adjusting the initial connection quantity of the transmission channel interface when the transmission efficiency is unstable and the actual data transmission is stable; The replacement block is connected to the efficiency comparison block and is used to replace the transmission channel interface of the initial connection based on the robot when the transmission efficiency is stable and the actual data transmission is unstable.

7. The plug-and-play intelligent reactive power compensation device structure according to claim 6 is characterized in that: The computing unit comprises: an active power calculation subunit, 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 the fundamental voltage and the fundamental current, determine the fundamental voltage effective value, the fundamental current effective value and the actual phase difference corresponding to the voltage and the current based on the fundamental voltage signal and the fundamental current signal, and further determine the actual active power; A reactive power calculation subunit, connected to the active power calculation subunit, for determining actual reactive power based on the analysis result of the frequency domain signal; The compensation calculation subunit is used to calculate the reactive power compensation target value based on the actual active power and the preset power factor target value, perform difference calculation between the actual reactive power and the reactive power compensation target value, and determine the actual reactive power compensation amount based on the difference calculation result.

8. The plug-and-play intelligent reactive power compensation device structure according to claim 7 is characterized in that: The instruction generation unit comprises: A capacitance analysis subunit, used to obtain and analyze the historical operation time and the historical switching times of the plurality of power capacitors, sort the plurality of power capacitors based on the historical operation time and the historical analysis results, and obtain capacitance sorting results; A switch analysis subunit, used to obtain the historical opening and closing times, historical action time intervals and real-time opening and closing states of the plurality of intelligent switches, analyze the historical opening and closing times, historical action time intervals and real-time opening and closing states, sort the plurality of intelligent switches based on the analysis results, and obtain a switch sorting result; The instruction generation subunit is used to determine the switch control strategy based on the actual reactive power compensation amount, the capacitor sorting result and the switch sorting result, and generate the switch control instruction according to the switch control strategy.

9. The plug-and-play intelligent reactive power compensation device structure according to claim 8 is characterized in that: The adjustment unit comprises: A parameter analysis subunit is used to monitor several real-time input parameters of the power grid input in real time, draw a parameter change graph based on the several real-time input parameters, and analyze the parameter change graph to identify the trend and amplitude of the parameter change to determine the actual parameter fluctuation stability; The instruction adjustment subunit is connected to the parameter analysis subunit and is used to adjust the switch control instruction according to the actual parameter fluctuation stability.

10. The plug-and-play intelligent reactive power compensation device structure according to claim 9, characterized in that: The parameter analysis subunit comprises: The trend identification block is used to analyze the parameter change graph through the exponential smoothing algorithm to determine the parameter change trend; The amplitude evaluation block is used to calculate the area ratio corresponding to the value exceeding the preset amplitude in the parameter change diagram; The stability determination block is used to determine the stability of actual parameter fluctuations based on parameter change trends and regional proportions.

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