MCR magnetic control type dynamic reactive power compensation device and control screen

Abstract

The invention discloses an MCR magnetic control type dynamic reactive power compensation device and a control screen, and relates to the technical field of power grids. The controller comprises a central processing unit for sampling and processing, a digital signal processing unit, an analog-to-digital converter and a logic control unit; the sampling device is used for collecting three-phase voltage and current signals of the compensated power system; the excitation driving circuit is used for providing adjustable direct-current excitation current for the MCR, and the excitation driving circuit is realized by an MCR board and is powered by a DC220V working power supply; and the trigger unit is used for generating and outputting a trigger pulse for driving a thyristor, and the trigger unit is cooperatively realized by the MCR decision board and the main control board. According to the MCR compensation device, by collecting the current of the MCR compensation device, the adjusting effect of the electric reactor can be monitored, the MCR compensation device can be used for protecting the device, and the electric reactor can be protected by overvoltage and undervoltage protection, overcurrent protection and sampling voltage disconnection protection.

Description

A magnetically controlled dynamic reactive power compensation device and control panel Technical Field

[0001] This application relates to the field of power grid technology, specifically to an MCR magnetically controlled dynamic reactive power compensation device and control panel. Background Technology

[0002] Currently available dynamic compensation devices, such as TCR (thyristor-controlled reactors), are not only expensive but also require a large footprint and have complex structures, hindering their widespread adoption. Because the TCR is located on the high-voltage side of the equipment, it cannot be directly used in high-voltage power grids and requires a transformer for voltage reduction. In contrast, the MCRPK-10 magnetic control device employs advanced self-excitation and limiting magnetic saturation technologies, offering significant advantages over TCRs and transformer-type controllable reactors (CRTs) such as lower output harmonics, simpler structure, higher reliability, lower cost, and smaller footprint. It is an ideal dynamic reactive power compensation device for ultra-high voltage and extra-high voltage power grids. Summary of the Invention

[0003] In view of this, the present application aims to provide an MCR magnetically controlled dynamic reactive power compensation device and control panel, which generates DC current through a control circuit to control excitation, thereby changing the saturation of the local iron core and thus changing the inductive reactance value of the reactor.

[0004] To achieve the above objectives, the first aspect of this application provides: an MCR magnetically controlled dynamic reactive power compensation device, comprising: an MCR magnetically controlled reactor; a controller, the controller including a central processing unit for sampling and processing, a digital signal processing unit, an analog-to-digital converter, and a logic control unit; and a sampling device for acquiring three-phase voltage and current signals of the compensated power system, including a voltage transformer, a current transformer, and a device for acquiring the measured current of the MCR outgoing line cabinet reactor, the three-phase voltage of the low-voltage side of the main transformer, the current detection of the MCR body, the voltage detection of the MCR body, the three-phase current of the main transformer incoming line cabinet, and the three-phase voltage of the main transformer incoming line cabinet. The system includes: a voltage excitation drive circuit for providing adjustable DC excitation current to the MCR magnetically controlled reactor, the excitation drive circuit being implemented by the MCR board and powered by a DC220V power supply; a trigger unit for generating and outputting trigger pulses to drive the thyristors, the trigger unit being implemented collaboratively by the MCR decision board and the main control board; wherein, the compensated power system includes a first bus and a second bus, a bus tie switch being provided between the first bus and the second bus to achieve parallel or isolated connection, and the first bus and the second bus respectively providing voltage and current signals to the sampling device through voltage transformers and current transformers.

[0005] In some embodiments, the controller further includes a communication interface, a human-machine interface unit, a power supply, and protection devices; wherein, the communication interface is used for data exchange with the integrated automation system or RTU, and the communication interface is RS232 / RS485; the human-machine interface unit includes a keyboard and a display; the power supply and protection devices include DC circuit breakers, fuses, AC circuit breakers, voltage sampling circuit breakers, synchronous voltage circuit breakers, relays, and surge arresters.

[0006] In some embodiments, the controller generates an adjustable DC excitation current through the excitation drive circuit. The DC excitation current acts on a local core of the MCR magnetically controlled reactor to change the magnetic saturation of the local core, thereby continuously and smoothly changing the inductive reactance of the reactor to achieve a wide range of reactive power adjustment.

[0007] In some embodiments, the controller calculates instantaneous active power, instantaneous reactive power, and power factor angle based on the voltage and current signals collected by the sampling device, determines the required compensation capacity, and generates a thyristor trigger delay angle accordingly to drive the thyristor by the triggering unit.

[0008] In some embodiments, the controller has two control modes: one-to-one and one-to-two. In the one-to-one control mode, the central processing unit issues excitation and trigger commands to only a single MCR magnetically controlled reactor, and the single MCR magnetically controlled reactor is connected to either the first bus or the second bus. In the one-to-two control mode, the central processing unit issues independent or synchronous excitation and trigger commands to two MCR magnetically controlled reactors respectively, and each MCR magnetically controlled reactor is electrically connected to the first bus or the second bus through an independent circuit breaker, so that when one MCR magnetically controlled reactor fails or is under maintenance, the other MCR magnetically controlled reactor continues to supply power. The dynamic reactive power compensation device is also equipped with an on-load tap changer and a disconnect switch. The on-load tap changer is used to adjust the voltage of the first bus and the second bus in parallel or independent operation. The disconnect switch is used to electrically isolate one of the MCR magnetically controlled reactors from the first bus or the second bus during maintenance or failure.

[0009] In some embodiments, the central processing unit determines the parallel or isolated operation status of the first bus and the second bus based on the position signal of the bus tie switch and the switching status of the capacitor bank, and selects a control strategy of one-to-one or one-to-two control accordingly.

[0010] In some embodiments, the power flow between the MCR magnetically controlled reactor and the first busbar is controlled by the excitation current and trigger pulse output by the MCR board. The control path is: first busbar → voltage transformer / current transformer → main transformer board → central processing unit → MCR decision board → MCR board → MCR magnetically controlled reactor. The current measured by the MCR outgoing line cabinet reactor, the current detected by the MCR body, and the voltage detected by the MCR body are fed back to the main transformer board or the central processing unit. The main transformer board also provides analog current output and analog voltage output for providing analog signals to external monitoring or recording equipment to support the analog quantity acquisition of the integrated automation system or recording equipment.

[0011] In some embodiments, when the first bus and the second bus are running in parallel, the position signal of the bus tie switch and the switching state of the capacitor bank jointly determine the parallel control strategy of the central processing unit for the MCR magnetically controlled reactor. The central processing unit adjusts the excitation and trigger output of the MCR board according to the strategy to maintain the voltage and power factor of the first bus and the second bus within a set range.

[0012] The second aspect of this application provides: an MCR magnetically controlled dynamic reactive power compensation control panel, comprising: a housing, an indicator light on the side of the housing cabinet door, and a lighting lamp, a first terminal, and a second terminal inside the housing; a DC circuit breaker, a fuse, an AC circuit breaker, a voltage sampling circuit breaker, and a synchronous voltage circuit breaker arranged side by side, and a relay arranged side by side with the second terminal; a guide rail disposed inside the housing and capable of mounting the DC circuit breaker, fuse, AC circuit breaker, voltage sampling circuit breaker, synchronous voltage circuit breaker, and the relay; and a controller installed outside the housing for controlling the MCR magnetically controlled reactor, and the controller having a live display for indicating the live status of the first busbar and the second busbar.

[0013] In some embodiments, the guide rail has at least one slide rail, which is arranged along a first direction. A connector is provided on the inner side of the slide rail, and a mounting plate is provided on the outer side of the connector. The connector includes a slide rod, a pull plate, a deformation groove, and a retaining groove. The two ends of the pull plate are respectively sleeved on the slide rod and the mounting plate and can rotate relative to the slide rod and the mounting plate. The deformation groove is opened on the side of the pull plate facing the mounting plate. When the pull plate is in the downward position, the retaining groove engages with the slide rail. When the pull plate is in the upward position, the retaining groove disengages from the slide rail so that the pull plate deforms at the deformation groove and is pulled out.

[0014] This application collects current data from the MCR compensation device itself. This serves two purposes: first, it monitors the reactor's regulation effect; second, it provides protection for the device, including overvoltage and undervoltage protection, overcurrent protection, sampling voltage drop protection, external connection fault protection, magnetic control body fault protection, voltage exceeding upper and lower limits alarm, magnetic control three-phase current imbalance alarm, and harmonic protection.

[0015] Other features and advantages of this application will be set forth in the following description, and in part will be apparent from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the external structure of the housing of this application; Figure 2 is a schematic diagram of the internal structure of the housing of this application; Figure 3 is a block diagram of the electrical principle of the controller of this application; Figure 4 is a partial block diagram of the electrical principle of the controller of this application; Figure 5 is a partial block diagram of the electrical principle of the second bus of this application; Figure 6 is a partial block diagram of the electrical principle of the first bus of this application; Figure 7 is a partial block diagram of the MCR board of this application; Figure 8 is a partial block diagram of the main transformer board of this application; Figure 9 is a partial block diagram of the main control board of this application; Figure 10 is a schematic diagram of the guide rail structure of this application; Figure 11 is an anatomical diagram of the guide rail and connector structure of this application; Figure 12 is a side plan view of the guide rail and connector structure of this application; Figure 13 is a schematic diagram of the lifting position of the pull plate of this application; Figure 14 is a schematic diagram of the lowering position of the pull plate of this application; Figure 15 is a schematic diagram of the pull plate structure of this application.

[0017] In the diagram: 1. Housing; 2. Controller; 3. Indicator light; 4. Lighting; 5a. First terminal; 5b. Second terminal; 6. DC circuit breaker; 7. Fuse; 8. AC circuit breaker; 9. Voltage sampling circuit breaker; 10. Synchronous voltage circuit breaker; 11. Relay; 12. MCR decision board; 13. MCR board; 14. Main transformer board; 15. Main control board; 16. MCR outgoing line cabinet reactor measurement current; 17. Main transformer low-voltage side three-phase voltage; 18. MCR body current detection; 19. MCR body voltage detection; 20. DC220V working power supply; 21. Main transformer incoming line cabinet three-phase current; 22. Main transformer incoming line cabinet three-phase current. Phase voltage; 23. Current analog output; 24. Voltage analog output; 25. Central processing unit; 26. Integrated automation system; 27. Keyboard; 28. Display; 29. ​​Communication interface; 31. Capacitor cabinet; 32. Voltage transformer; 33. Current transformer; 34. Bus tie switch; 35. On-load tap changer; 36. Disconnect switch; 37. Live display; 38. Surge arrester; 39. MCR magnetically controlled reactor; L1. First busbar; L2. Second busbar; 100. Guide rail; 110. Slide rail; 120. Connector; 130. Mounting plate; 121. Slide rod; 122. Pull plate; 123. Deformation groove; 124. Slot. Detailed Implementation

[0018] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion.

[0020] In the description of the embodiments of this application, the technical terms "first," "second," "third," etc., are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0023] This application provides an MCR magnetically controlled dynamic reactive power compensation device, as shown in Figures 3-9. It includes an MCR magnetically controlled reactor 39, a controller 2, a sampling device, an excitation drive circuit, a trigger unit, a communication interface 29, a human-machine interaction unit, a power supply and protection device, and auxiliary devices.

[0024] The controller 2 includes a central processing unit 25 for sampling and processing, a digital signal processing unit, an analog-to-digital converter, and a logic control unit; a sampling device for acquiring three-phase voltage and current signals of the compensated power system, including a voltage transformer 32, a current transformer 33, and a device for acquiring the measured current 16 of the MCR outgoing line cabinet reactor, the three-phase voltage 17 of the low-voltage side of the main transformer, the current detection 18 of the MCR body, the voltage detection 19 of the MCR body, the three-phase current 21 of the main transformer incoming line cabinet, and the three-phase voltage 22 of the main transformer incoming line cabinet; an excitation drive circuit for providing an adjustable DC excitation current to the MCR magnetically controlled reactor 39, the excitation drive circuit being implemented by the MCR board 13 and powered by a DC 220V power supply 20; and a trigger unit for generating and outputting trigger pulses to drive the thyristors, the trigger unit being implemented collaboratively by the MCR decision board 12 and the main control board 15.

[0025] Communication interface 29 is used for data exchange with integrated automation system 26 or RTU. Communication interface 29 is RS232 / RS485.

[0026] The human-computer interaction unit includes a keyboard 27 and a display 28.

[0027] The power supply and protection devices include a DC circuit breaker 6, a fuse 7, an AC circuit breaker 8, a voltage sampling circuit breaker 9, a synchronous voltage circuit breaker 10, a relay 11, and a surge arrester 38.

[0028] The auxiliary devices include an on-load tap changer 35, a disconnector 36, and a live indicator 37.

[0029] The compensated power system includes a first bus L1 and a second bus L2. A bus tie switch 34 is installed between the first bus L1 and the second bus L2 to achieve parallel or isolated connection. The first bus L1 and the second bus L2 provide voltage and current signals to the sampling device through voltage transformer 32 and current transformer 33, respectively.

[0030] In some embodiments, the secondary side of voltage transformer 32 is directly connected to the voltage sampling terminal of main transformer board 14, and the secondary side of current transformer 33 is connected in parallel to the current sampling terminal of main transformer board 14. The current measurement 16 of the reactor of MCR outgoing cabinet is connected to the dedicated sampling channel of MCR board 13. The voltage of the low voltage side of main transformer and the three-phase current 21 / three-phase voltage 22 of main transformer incoming cabinet are connected to main transformer board 14. The current analog output 23 and voltage analog output 24 provided by main transformer board 14 are output to external monitoring or recording equipment through terminals. When the voltage deviation or current abnormality occurs on the first bus L1 or the second bus L2, the central processing unit 25 can immediately read the voltage / current value uploaded by main transformer board 14 and trigger the control algorithm, thereby realizing high-precision, simultaneous sampling and protection of voltage and current measurement and supporting remote monitoring and harmonic detection.

[0031] The sampling hardware employs a high-precision multi-channel ADC with isolation amplification and anti-interference filtering circuits at the front end. The sampling bandwidth covers at least 3 kHz to detect higher harmonics. After anti-aliasing filtering, the sampled signal is sent to the DSP and central processing unit 25 for digital processing. The DSP performs FFT or digital filter bank analysis on the sampled signal to obtain the 3rd to 15th harmonic components and THD. The integrated system 26 or recording device can obtain real-time and historical data through analog output or RS232 / RS485 interface, thereby meeting the needs of harmonic detection, fault location and remote data analysis.

[0032] In some embodiments, the controller 2 adopts an architecture of ARMSTM32 series + DSP 32-bit floating point + CPLD + ADC. The central processing unit 25 is responsible for overall scheduling, communication and human-machine interaction, the DSP is responsible for real-time sampling processing and harmonic analysis, the CPLD is responsible for precise timing of trigger pulses and logic interlocking, and the ADC is responsible for high-precision sampling. This architecture enables the controller 2 to achieve a balance between real-time performance and computational accuracy, thereby ensuring the fast response of the control algorithm and the accurate output of trigger pulses.

[0033] In some embodiments, the excitation drive circuit is implemented by the MCR board 13 and powered by the DC 220V power supply 20. The excitation drive circuit outputs an adjustable DC excitation current and directly acts on the local iron core of the MCR magnetically controlled reactor 39. After calculating the reactive power capacity that needs to be compensated, the central processing unit 25 issues an excitation command through the MCR decision board 12. The MCR board 13 adjusts the excitation current step by step according to the command, so that the magnetic saturation of the local iron core changes and the inductive reactance of the reactor is changed continuously and smoothly, thereby realizing wide-range, stepless reactive power regulation and reducing harmonic injection when the load changes.

[0034] In some embodiments, the MCR decision board 12 and the main control board 15 work together to generate thyristor trigger pulses. Before triggering, the CPLD performs an interlock check and is linked with the relay 11. When the trigger pulse timing is abnormal or the external safety interlock is not closed, the CPLD prohibits triggering and disconnects the trigger circuit through the relay 11. The trigger circuit has functions of preventing false triggering, soft start and fault self-check, thereby preventing malfunction and protecting the device and power grid stability when the triggering is abnormal or the safety conditions are not met.

[0035] In some embodiments, the controller 2 calculates instantaneous active power, instantaneous reactive power, and power factor angle based on the voltage and current signals collected by the sampling device, determines the required compensation capacity, and generates the thyristor trigger delay angle accordingly. The control target can be selected between constant voltage compensation and constant power factor compensation. When the harmonics or THD exceed the preset protection setting, the DSP prioritizes cutting off the capacitors already connected in the capacitor cabinet 31 and alarms. If the limit is still exceeded after cutting off the capacitors, the MCR excitation or trigger angle is restricted and the operation and maintenance personnel are notified, thereby achieving harmonic control and equipment protection while ensuring the voltage / power factor target.

[0036] In some embodiments, the system supports both manual and automatic output modes and can switch smoothly. In manual mode, field personnel set the excitation upper limit, harmonic protection threshold and trigger lookup parameters through the keyboard 27 and display 28. In automatic mode, the central processing unit 25 operates according to a preset strategy and communicates with the integrated automation system 26 or RTU through the communication interface 29 to report voltage, current, active power, reactive power, operating status and protection records, thereby taking into account both on-site operability and remote automated management.

[0037] Through communication interface 29, it can communicate with the master station or RTU to upload information such as the current voltage, current, active power, reactive power, and operating status of the reactor. It adopts a standard RS232 / RS485 interface, with communication protocol provided by the manufacturer. The transmission speed is 1200bps and adjustable, realizing local, background, and dispatch control and management. Manual and automatic modes can be selected arbitrarily, and it has four remote functions.

[0038] In some embodiments, the system supports two control modes: one-to-one and one-to-two. In the one-to-one mode, the central processor 25 issues excitation and trigger commands to a single MCR. In the one-to-two mode, the central processor 25 issues independent or synchronous commands to two sets of MCRs respectively, and each set of MCRs is electrically connected to the busbar through an independent circuit breaker. When one set fails or needs maintenance, the isolating switch 36 can isolate the faulty set, while the other set continues to operate in parallel. When operating in parallel, the central processor 25 selects the parallel or split strategy and reallocates compensation tasks based on the position signal of the bus tie switch 34 and the switching status of the capacitor bank 31, thereby achieving redundant operation and uninterrupted maintenance capability.

[0039] In some embodiments, the on-load tap changer 35 is installed on the bus side and controlled by the central processing unit 25. When it is necessary to fine-tune the bus voltage under the condition of no power interruption, the central processing unit 25 issues an on-load tap changer command to drive the on-load tap changer 35 to adjust the tap position, thereby realizing on-site voltage fine-tuning in parallel or independent operation to maintain voltage stability.

[0040] In some embodiments, surge arrester 38 is connected in parallel to the bus and the grounding terminal and works in conjunction with DC circuit breaker 6, fuse 7 and AC circuit breaker 8. When lightning overvoltage or transient impact occurs, surge arrester 38 first discharges the overvoltage. If the discharge current exceeds the set value, it triggers fuse 7 or circuit breaker to cut off the fault circuit, thereby protecting the control cabinet and MCR body from overvoltage damage.

[0041] In some embodiments, the live display device 37 is connected in parallel with the indicator light 3 on the front panel of the housing 1. When the bus is energized or the power supply is abnormal, the live display device 37 and the indicator light 3 will light up simultaneously and trigger an audible and visual alarm. On-site personnel can intuitively judge the energized status and take safety measures without touching the equipment, thereby improving the safety of on-site operations.

[0042] In some embodiments, the voltage sampling circuit breaker 9 and the synchronization voltage circuit breaker 10 are used for isolation and synchronization of the sampling circuit. When the sampling voltage drops or the synchronization voltage is abnormal, the controller 2 enters the protection mode and reports the fault information to the integrated automation system 26 through the communication interface 29. At the same time, the system is switched to a safe state to prevent malfunction, thereby ensuring the system is safe and reliable when sampling is abnormal.

[0043] In some embodiments, the analog current output 23 and analog voltage output 24 provided by the main transformer board 14 are output to an external recording device through terminals. During debugging, the analog output is checked for range and polarity by a calibration signal source to ensure that the analog quantity received by the remote monitoring system is consistent with the actual measured value, thereby ensuring the accuracy of remote control and historical data analysis.

[0044] In some embodiments, the system is configured with a software dongle and a software fault tolerance mechanism. When the controller 2 software is abnormal or deadlocked, the software dongle triggers a hardware reset and switches to a redundant program or safe mode. The hardware interlock between the CPLD and the main control board 15 ensures that the triggering unit is in a disabled state during the software reset, thereby avoiding false triggering and quickly restoring system operation in the event of a software failure.

[0045] It should be noted that during routine maintenance, maintenance personnel can completely isolate the MCR board 13 from the main transformer board 14 by disconnecting the DC circuit breaker 6 and the AC circuit breaker 8 and opening the isolating switch 36. The live display 37 will turn off after isolation to indicate a safe status. After maintenance is completed and reset, sampling calibration, excitation test and parallel operation verification will be gradually restored according to the self-test process, thereby ensuring the safety of the maintenance process and the reliability of the restored operation.

[0046] One implementation method is constant voltage compensation with one-control-one-operation: when the voltage of the first bus L1 is low and reactive power compensation of about 200 kVAr is required, the central processing unit 25 reads the sampled value and calculates the compensation amount, the DSP calculates the trigger delay angle and the excitation current is output by the MCR board 13 to change the MCR inductive reactance to inject reactive power, and the voltage is restored to the set value; if the harmonic THD exceeds the set threshold (e.g., 5%), the system automatically disconnects the capacitors already connected in the capacitor cabinet 31 and alarms, thereby realizing voltage restoration and automatic harmonic protection under single-unit operation.

[0047] Another implementation method is parallel one-to-two operation: when two sets of MCRs are operating in parallel and the bus tie switch 34 is closed, the central processing unit 25 allocates the compensation capacity according to the parallel strategy. When one set experiences an overcurrent trip or magnetic control body failure, the disconnect switch 36 operates to isolate the faulty set. The central processing unit 25 reallocates the compensation task to the other set and reports the event to the integrated automation system 26 via RS485 and records the event, thereby achieving redundant protection of fault isolation and uninterrupted power supply under parallel operation.

[0048] From the perspective of system structure, the basic components of this application, whether it is a voltage regulation or reactive power compensation system composed of MCR magnetically controlled reactors 39, should be able to detect relevant variables of the system and generate corresponding thyristor trigger pulses according to the magnitude of the detected quantity and the magnitude of the given (reference) input quantity, so as to adjust the reactive power of the compensation system. Therefore, its control system should generally include the following four parts: Detection section: realize the acquisition of three-phase voltage and current of MCR reactive power compensation of the power supply system, and detect the system variables and compensation variables required by the control system.

[0049] Control Section: The control device should be able to automatically detect all variables required by the system and automatically calculate the magnitude of the susceptance of each phase of the MCR and the corresponding thyristor trigger delay angle based on the detected quantities. The MCR can then automatically adjust the compensation susceptance of each phase according to the changes in the three-phase current. The detected signals and given inputs are processed to obtain the required steady-state and dynamic characteristics.

[0050] Triggering section: Based on the control signal output by the control circuit, a thyristor trigger pulse with a corresponding trigger delay angle is generated, and the thyristor is driven to trigger.

[0051] Protection Section: Based on detection signals, the system provides corresponding protection against MCR system faults. Its features include: firstly, resetting, self-testing, and initialization. Then, it checks if keyboard 27 issues a command; if so, it runs the corresponding program to determine the MCR's operating mode. During normal operation, by collecting voltage and current, it calculates the power factor angle, instantaneous active power, and instantaneous reactive power. Based on compensation requirements (constant voltage compensation or constant power factor compensation), it calculates the compensation capacity and finds the corresponding thyristor control trigger angle α by referring to a table (or based on the MCR control characteristics) to achieve continuous and smooth adjustment. By collecting current from the MCR compensation device itself, it can monitor the reactor's adjustment effect and serve as protection for the device. Reactor protection includes overvoltage and undervoltage protection, overcurrent protection, sampling voltage drop protection, external connection fault protection, magnetic control body fault protection, voltage exceeding upper and lower limits alarm, magnetic control three-phase current imbalance alarm, and harmonic protection.

[0052] A magnetically controlled dynamic reactive power compensation control panel, as shown in Figures 1-2, includes a housing 1. An indicator light 3 is located on the side of the cabinet door of the housing 1. Inside the housing 1 are a lighting lamp 4, a first terminal 5a, and a second terminal 5b. A DC circuit breaker 6, a fuse 7, an AC circuit breaker 8, a voltage sampling circuit breaker 9, and a synchronous voltage circuit breaker 10 are arranged side-by-side, and a relay 11 is arranged side-by-side with the second terminal 5b. The first terminal 5a is located on one side inside the housing 1. A guide rail 100 is located inside the housing and can be used to install the DC circuit breaker 6, the fuse 7, the AC circuit breaker 8, the voltage sampling circuit breaker 9, the synchronous voltage circuit breaker 10, and the relay 11.

[0053] The controller 2 is installed on the outside of the housing 1 to control the MCR magnetically controlled reactor 39, and the controller 2 is equipped with a power display 37 to indicate the power status of the first bus L1 and the second bus L2.

[0054] Among them, controller 2 is MCRPK-10 controller 2.

[0055] In some embodiments, as shown in Figures 10-15, the guide rail 100 is provided with at least one slide rail 110, the slide rail 110 is arranged along a first direction, the inner side of the slide rail 110 is provided with a connector 120, and the outer side of the connector 120 is provided with a mounting plate 130; the connector 120 includes a slide rod 121, a pull plate 122, a deformation groove 123 and a locking groove 124, the two ends of the pull plate 122 are respectively sleeved on the slide rod 121 and the mounting plate 130 and can rotate relative to the slide rod 121 and the mounting plate 130, the deformation groove 123 is opened on the side of the pull plate 122 facing the mounting plate 130; when the pull plate 122 is in the pressed position, the locking groove 124 engages with the slide rail 110, and when the pull plate 122 is in the raised position, the locking groove 124 disengages from the slide rail 110 so that the pull plate 122 deforms at the deformation groove 123 and is pulled out.

[0056] The guide rail 100 is equipped with a slide rail 110, which allows the pull plate 122 to be pulled out when installing, inspecting or replacing electrical components. The pull plate 122 bends and deforms at the deformation groove 123, allowing for individual adjustment without interfering with other electrical components. To further maintain the stability of the electrical components, the weight of the electrical components themselves, after being installed on the mounting plate 130, puts the pull plate 122 in a downward position. The retaining groove 124 engages with the slide rail 110, maintaining the stability of the electrical components. During inspection, the electrical components are lifted, causing the mounting plate 130 to move the pull plate 122 upward. When the retaining groove 124 disengages from the slide rail 110 and is pulled outward, the pull plate 122 deforms at the deformation groove 123, thereby causing the mounting plate 130 to detach from the guide rail 100 and be pulled out.

[0057] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein.

Claims

1. An MCR magnetically controlled dynamic reactive power compensation device, characterized in that, include: MCR magnetically controlled reactor (39); controller (2), the controller (2) includes a central processing unit (25) for sampling and processing, a digital signal processing unit, an analog-to-digital converter and a logic control unit; sampling device for collecting three-phase voltage and current signals of the compensated power system, including voltage transformer (32), current transformer (33) and collecting the measured current (16) of the MCR outgoing cabinet reactor, the three-phase voltage (17) of the low-voltage side of the main transformer, the MCR body current detection (18), the MCR body voltage detection (19), the three-phase current (21) of the main transformer incoming cabinet and the three-phase voltage (22) of the main transformer incoming cabinet; excitation drive circuit for driving the MCR magnetically controlled reactor (39) The excitation drive circuit is implemented by the MCR board (13) and powered by the DC220V power supply (20); the trigger unit is used to generate and output the trigger pulse for driving the thyristor, and the trigger unit is implemented by the MCR decision board (12) and the main control board (15); wherein, the compensated power system includes a first bus (L1) and a second bus (L2), and a bus tie switch (34) is set between the first bus (L1) and the second bus (L2) to realize parallel or isolated connection, and the first bus (L1) and the second bus (L2) respectively provide voltage and current signals to the sampling device through voltage transformer (32) and current transformer (33).

2. The MCR magnetically controlled dynamic reactive power compensation device according to claim 1, characterized in that, The controller (2) is also equipped with a communication interface (29), a human-machine interaction unit, a power supply and protection device; wherein, the communication interface (29) is used to exchange data with the integrated automation system (26) or RTU, and the communication interface (29) is RS232 / RS485; the human-machine interaction unit includes a keyboard (27) and a display (28); the power supply and protection device includes a DC circuit breaker (6), a fuse (7), an AC circuit breaker (8), a voltage sampling circuit breaker (9), a synchronous voltage circuit breaker (10), a relay (11) and a surge arrester (38).

3. The MCR magnetically controlled dynamic reactive power compensation device according to claim 2, characterized in that, The controller (2) generates an adjustable DC excitation current through the excitation drive circuit. The DC excitation current acts on the local iron core of the MCR magnetically controlled reactor (39) to change the magnetic saturation of the local iron core, thereby continuously and smoothly changing the inductive reactance value of the reactor to achieve a wide range of reactive power adjustment.

4. The MCR magnetically controlled dynamic reactive power compensation device according to claim 3, characterized in that, The controller (2) calculates instantaneous active power, instantaneous reactive power and power factor angle based on the voltage and current signals collected by the sampling device, determines the required compensation capacity and generates the thyristor trigger delay angle accordingly so that the triggering unit can drive the thyristor.

5. The MCR magnetically controlled dynamic reactive power compensation device according to claim 4, characterized in that, The controller (2) has two control modes: one-to-one and one-to-two. In the one-to-one control mode, the central processing unit (25) issues excitation and trigger commands to only a single MCR magnetically controlled reactor (39), and the single MCR magnetically controlled reactor (39) is connected to either the first bus (L1) or the second bus (L2). In the one-to-two control mode, the central processing unit (25) issues independent or synchronous excitation and trigger commands to two MCR magnetically controlled reactors (39), and each MCR magnetically controlled reactor (39) is connected to the first bus (L1) through an independent circuit breaker. The second bus (L2) is electrically connected so that when one MCR magnetically controlled reactor (39) fails or is under maintenance, the other MCR magnetically controlled reactor (39) continues to operate. The dynamic reactive power compensation device is also equipped with an on-load tap changer (35) and a disconnect switch (36). The on-load tap changer (35) is used to adjust the voltage of the first bus (L1) and the second bus (L2) in parallel or independent operation. The disconnect switch (36) is used to electrically isolate one of the MCR magnetically controlled reactors (39) from the first bus (L1) or the second bus (L2) during maintenance or failure.

6. The MCR magnetically controlled dynamic reactive power compensation device according to claim 5, characterized in that, The central processing unit (25) determines the parallel or isolated operation status of the first bus (L1) and the second bus (L2) based on the position signal of the bus tie switch (34) and the switching status of the capacitor bank (31), and selects a control strategy of one-to-one or one-to-two control accordingly.

7. The MCR magnetically controlled dynamic reactive power compensation device according to claim 6, characterized in that, The power flow between the MCR magnetically controlled reactor (39) and the first bus (L1) is controlled by the excitation current and trigger pulse output by the MCR board (13). The control path is: first bus (L1) → voltage transformer (32) / current transformer (33) → main transformer board (14) → central processing unit (25) → MCR decision board (12) → MCR board (13) → MCR magnetically controlled reactor (39). The current (16) measured by the reactor of the MCR outgoing cabinet, the current detection (18) of the MCR body, and the voltage detection (19) of the MCR body are fed back to the main transformer board (14) or the central processing unit (25). The main transformer board (14) also provides analog current output (23) and analog voltage output (24) to provide analog signals to external monitoring or recording equipment to support the analog acquisition of the integrated automation system (26) or recording equipment.

8. The MCR magnetically controlled dynamic reactive power compensation device according to claim 7, characterized in that, When the first bus (L1) and the second bus (L2) are running in parallel, the position signal of the bus tie switch (34) and the switching state of the capacitor bank (31) jointly determine the parallel control strategy of the central processing unit (25) for the MCR magnetic control reactor (39). The central processing unit (25) adjusts the excitation and trigger output of the MCR board (13) according to the strategy to maintain the voltage and power factor of the first bus (L1) and the second bus (L2) within the set range.

9. An MCR magnetically controlled dynamic reactive power compensation control panel, used to install the MCR magnetically controlled dynamic reactive power compensation device as described in claim 8, characterized in that, include: The housing (1) has an indicator light (3) on the cabinet door side and a lighting lamp (4), a first terminal (5a) and a second terminal (5b) inside the housing (1). The DC circuit breaker (6), fuse (7), AC circuit breaker (8), voltage sampling circuit breaker (9) and synchronous voltage circuit breaker (10) are arranged side by side, and the relay (11) is arranged side by side with the second terminal (5b). The guide rail (100) is located inside the housing and can be used to install the DC circuit breaker (6), fuse (7), AC circuit breaker (8), voltage sampling circuit breaker (9), synchronous voltage circuit breaker (10) and the relay (11). The controller (2) is installed outside the housing (1) to control the MCR magnetic control reactor (39), and the controller (2) has a live display (37) to indicate the live status of the first bus (L1) and the second bus (L2).

10. The MCR magnetically controlled dynamic reactive power compensation control panel according to claim 9, characterized in that, The guide rail (100) is provided with at least one slide rail (110), the slide rail (110) is arranged along a first direction, the inner side of the slide rail (110) is provided with a connector (120), and the outer side of the connector (120) is provided with a mounting plate (130); the connector (120) includes a slide rod (121), a pull plate (122), a deformation groove (123) and a retaining groove (124), and the two ends of the pull plate (122) are respectively sleeved on the slide rod (121) and the mounting plate (130). It can rotate relative to the slide bar (121) and the mounting plate (130). The deformation groove (123) is opened on the side of the pull plate (122) facing the mounting plate (130). When the pull plate (122) is in the pressed position, the slot (124) engages with the slide rail (110). When the pull plate (122) is in the raised position, the slot (124) disengages from the slide rail (110) so that the pull plate (122) deforms at the deformation groove (123) and is pulled out.

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