Isolation grouping FC and MCR magnetic control dynamic compensation device

Abstract

According to the isolation grouping FC and MCR magnetic control dynamic compensation device of the utility model, a high-voltage isolation switch, a vacuum switch, a zinc oxide lightning arrester, a high-voltage fuse, a parallel capacitor, a series reactor and a high-voltage live display device are installed in an isolation grouping FC cabinet; the high-voltage live display device comprises a high-voltage sensor and a display which are connected with each other; a bus inlet wire is sequentially connected with a high-voltage isolating switch, a vacuum switch, a high-voltage fuse and a series reactor and then is connected with a parallel capacitor into one path, the parallel capacitor is in star connection and is connected with a discharge coil in parallel, and another two paths of branches of the bus inlet wire are respectively connected with a high-voltage live display device and a zinc oxide arrester to form an FC channel. The beneficial effects of the utility model are that the response speed is fast, the capacity adjusting range is wide, and the full-capacity continuous adjustment can be realized, thereby accurately controlling the voltage and reactive power of the system.

Description

Technical Field

[0001] This utility model belongs to the field of opto-mechatronics technology, the subfield of "power system informatization and automation", and the direction of "new energy-saving and power quality improvement technologies for power transmission and distribution systems and enterprises". It relates to a novel static harmonic control and compensation device, specifically an isolated grouped FC and MCR magnetically controlled dynamic compensation device. Background Technology

[0002] Optimal control of voltage and reactive power is a primary means of improving power supply quality and reducing transformer and line losses. As the power industry increasingly demands improved power quality and reduced losses, traditional switching capacitor banks have played a crucial role in maintaining power system quality for a long time. However, due to their large step-like compensation characteristics, they no longer meet the requirements of power systems with high reactive power requirements. Therefore, there is an urgent need for a new type of reactive power compensation technology that is continuously adjustable and has low fluctuations. This is a major issue facing the fields of electrical automation technology and power system research, and it is attracting increasing attention as a point of innovation and competitive advantage.

[0003] FC stands for fixed capacitor, and MCR stands for dry magnetically controlled reactor. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, an isolation grouping FC and MCR magnetic control dynamic compensation device is provided.

[0005] The utility model is realized through the following technical solutions:

[0006] An isolation group FC and MCR magnetically controlled dynamic compensation device, characterized in that: it includes an isolation group FC cabinet and an MCR magnetically controlled dynamic compensation cabinet;

[0007] The isolation group FC cabinet is equipped with high-voltage disconnect switches, vacuum switches, zinc oxide surge arresters, high-voltage fuses, parallel capacitors, series reactors, and high-voltage live display devices; the high-voltage live display devices include interconnected high-voltage sensors and displays;

[0008] The busbar incoming line is sequentially connected to a high-voltage disconnect switch, a vacuum switch, a high-voltage fuse, and a series reactor, and then connected to a parallel capacitor as one line. The parallel capacitor is connected in a star configuration and is connected in parallel with the discharge coil. The busbar incoming line also has two branches that are respectively connected to a high-voltage live display device and a zinc oxide surge arrester, forming an FC channel.

[0009] The MCR magnetically controlled dynamic compensation cabinet is equipped with a dry-type magnetically controlled reactor (MCR), a thyristor excitation box, a high-voltage live display, and a zinc oxide surge arrester. The busbar incoming line is connected to the dry-type magnetically controlled reactor (MCR), and the busbar incoming line also has two branches that are connected to the high-voltage live display device and the zinc oxide surge arrester, respectively.

[0010] Several current transformers are connected to the busbar, and each current transformer is connected to an ammeter.

[0011] In the thyristor excitation box, in the primary wiring circuit,

[0012] In branch KK1, resistor R1 and capacitor C1 are connected in series to form branch 1. After branch 1 is connected in parallel with thyristor TV1, it is connected to fuse FU1. Thyristor protector FV1 is connected in parallel between the cathode of thyristor TV1 and the high voltage terminal of fuse FU1. The control electrode G1 of thyristor TV1 is connected to the G1 terminal of trigger board KG, and the cathode K1 of thyristor TV1 is also connected to the K1 terminal of trigger board KG.

[0013] In branch KK2, resistor R2 and capacitor C2 are connected in series to form branch 2. After branch 2 is connected in parallel with thyristor TV2, it is connected to fuse FU2. Thyristor protector FV2 is connected in parallel between the cathode of thyristor TV2 and the high voltage terminal of fuse FU2. The control electrode G2 of thyristor TV2 is connected to the G2 terminal of trigger board KG. The cathode K2 of thyristor TV2 is also connected to the K2 terminal of trigger board KG. The anode K21 of thyristor TV2 is connected to the first pin of switching power supply U.

[0014] In branch DD1, resistor R3 and capacitor C3 are connected in series to form branch 3. After diode TD is connected in parallel in branch 3, fuse FU3 is connected. Thyristor protector FV3 is connected in parallel between the negative terminal of diode TD and the high voltage terminal of fuse FU3. The positive terminal D11 of diode TD is connected to the second pin of switching power supply U.

[0015] The positive and negative terminals of the switching power supply U are connected to the Vin and GND connectors of the trigger board KG, respectively. The fiber optic interface of the trigger board KG is connected to the decision board via fiber optic cable.

[0016] The high-voltage terminals of branches KK1, KK2, and DD1 are respectively connected to the control terminals of the dry-type magnetically controlled reactor.

[0017] A heat sink is also installed on the thyristor excitation box.

[0018] The dry-type magnetically controlled reactor has a cooling fan installed at the bottom, and the conductors are installed at the top via insulators.

[0019] The MCR magnetic dynamic compensation cabinet has several top-mounted cooling fans.

[0020] The beneficial effects of this invention are that by utilizing the hybrid AC / DC excitation characteristics and adjusting the conduction angle of the thyristor in the control circuit of the magnetically controlled reactor, the amplitude of the DC excitation current is changed, thereby adjusting the core magnetic saturation of the magnetically controlled reactor, changing the equivalent permeability, and altering the inductance and reactance of the windings, thus achieving continuous and smooth adjustment of the output capacity. The magnetically controlled reactor has a fast response speed and a wide capacity adjustment range, enabling continuous adjustment of the full capacity, thereby precisely controlling the system's voltage and reactive power.

[0021] A discharge coil is installed on a parallel power capacitor to form an inductive-capacitive parallel resonant circuit. This allows electrical energy to be quickly dissipated during resonance. Typically, the discharge coil should be able to reduce the capacitor terminal voltage to 50V within 5 seconds of disconnecting the power supply. Installing a discharge coil ensures the safety of personnel and the safe and stable operation of the enterprise's power system and electrical equipment. Attached Figure Description

[0022] The attached figure is a structural schematic diagram of this utility model.

[0023] Figure 1 This is an outline drawing. Figure 2 This is a diagram of the internal structure. Figure 3 This is a circuit diagram. Figure 4 This is a structural diagram of the internal structure of the thyristor excitation box. Figure 5 This is the internal circuit diagram of the thyristor excitation box.

[0024] In the diagram, 3 is an isolation group FC cabinet, 1 is a high-voltage disconnect switch, 2 is a high-voltage sensor, 4 is an insulator, 5 is a zinc oxide surge arrester, 6 is a high-voltage fuse, 7 is a parallel capacitor, 8 is a series reactor, and 11 is a wall bushing.

[0025] MCR magnetically controlled dynamic compensation cabinet includes 12, 9 dry-type magnetically controlled reactors, 10 thyristor excitation boxes, 2 high-voltage sensors, 5 zinc oxide surge arresters, 13 cabinet top cooling fans, and 14 reactor body cooling fans.

[0026] 15 Cabinet interior lighting, 16 Electromagnetic lock, 17 Temperature controller, 18 High-voltage live display device, 19 Ammeter, 20 Isolation handle.

[0027] 101 Excitation box housing, 102 Capacitor, 103 Heat sink, 104 Trigger board, 105 Thyristor protector, 106 Switching power supply, 107 Thyristor, 108 Resistor, 109 Fuse, 110 Diode. Detailed Implementation

[0028] The attached figure shows one embodiment of this utility model.

[0029] The present invention relates to an isolation grouping FC and MCR magnetic control dynamic compensation device, comprising an isolation grouping FC cabinet 3 and an MCR magnetic control dynamic compensation cabinet 12.

[0030] The isolation group FC cabinet is equipped with a high-voltage disconnect switch 1, a vacuum switch, a zinc oxide surge arrester 5, a high-voltage fuse 6, a parallel capacitor 7, a series reactor 8, and a high-voltage live display device; the high-voltage live display device includes a high-voltage sensor 2 and a display that are interconnected.

[0031] The busbar incoming line is sequentially connected to the high-voltage disconnector GL, vacuum switch 1KM, high-voltage fuse 1FU, and series reactor 1L. Then it is connected to parallel capacitors 1C, 2C, and 3C as one line. The parallel capacitors are connected in a star configuration and are connected in parallel with the discharge coil TV. The busbar incoming line also has two branches that are respectively connected to the high-voltage live display device DXN and the zinc oxide surge arrester 2FV, forming the FC channel.

[0032] Inside the MCR magnetically controlled dynamic compensation cabinet 12, there is a dry-type magnetically controlled reactor (MCR) 9, a thyristor excitation box 10, a high-voltage live-line indicator, and a zinc oxide surge arrester 5. The busbar incoming line is connected to the dry-type magnetically controlled reactor (MCR), and the busbar incoming line also has two branches that are respectively connected to the high-voltage live-line indicator device DXN and the zinc oxide surge arrester 1FV. The high-voltage live-line indicator device includes an interconnected high-voltage sensor 2 and a display.

[0033] Several current transformers (CTs) are connected to the busbar, and each current transformer is connected to an ammeter.

[0034] In the thyristor excitation box, in the primary wiring circuit,

[0035] In branch KK1, resistor R1 and capacitor C1 are connected in series to form branch 1. After branch 1 is connected in parallel with thyristor TV1, it is connected to fuse FU1. Thyristor protector FV1 is connected in parallel between the cathode of thyristor TV1 and the high voltage terminal of fuse FU1. The control electrode G1 of thyristor TV1 is connected to the G1 terminal of trigger board KG, and the cathode K1 of thyristor TV1 is also connected to the K1 terminal of trigger board KG.

[0036] In branch KK2, resistor R2 and capacitor C2 are connected in series to form branch 2. After branch 2 is connected in parallel with thyristor TV2, it is connected to fuse FU2. Thyristor protector FV2 is connected in parallel between the cathode of thyristor TV2 and the high voltage terminal of fuse FU2. The control electrode G2 of thyristor TV2 is connected to the G2 terminal of trigger board KG. The cathode K2 of thyristor TV2 is also connected to the K2 terminal of trigger board KG. The anode K21 of thyristor TV2 is connected to the first pin of switching power supply U.

[0037] In branch DD1, resistor R3 and capacitor C3 are connected in series to form branch 3. After diode TD is connected in parallel in branch 3, fuse FU3 is connected. Thyristor protector FV3 is connected in parallel between the negative terminal of diode TD and the high voltage terminal of fuse FU3. The positive terminal D11 of diode TD is connected to the second pin of switching power supply U.

[0038] The positive and negative terminals of the switching power supply U are connected to the Vin and GND connectors of the trigger board KG, respectively. The fiber optic interface of the trigger board KG is connected to the decision board via fiber optic cable.

[0039] The high-voltage terminals of branches KK1, KK2, and DD1 are respectively connected to the control terminals of the dry-type magnetically controlled reactor, and are connected by multi-strand copper core wires.

[0040] A heat sink is also installed on the thyristor excitation box.

[0041] The dry-type magnetically controlled reactor is equipped with a reactor body cooling fan 14 at the bottom and the conductor is installed on the top of the dry-type magnetically controlled reactor via insulator support.

[0042] The MCR magnetic dynamic compensation cabinet is equipped with four top cooling fans 13.

[0043] The voltage reactive power controller's CPU is a 32-bit microcontroller, and its A / D converter is a 32-bit A / D conversion chip. The microcontroller can be an STM32F103 "enhanced", an STM32F101 "basic", an STM32F105, or an STM32F107 "interconnected".

[0044] The controller can be networked with the substation integrated automation system via RS485 / RS232 communication interface to realize local, back-end, and dispatch control and management. It can arbitrarily select manual and automatic modes for each party and has four remote functions.

[0045] 1. The excitation box circuit is an internal circuit. Finally, the trigger board is connected to the decision board via optical fiber, and the decision board is connected to the controller; 2. The reactor circuit is also connected to the controller; all switching, switching, and compensation commands are issued through the controller.

[0046] The decision board is a circuit board of the controller. The controller has 6 boards: #1 voltage and current sampling, #2 voltage and current sampling, #1 switch quantity, #2 switch quantity, #1 decision board, and #2 decision board.

[0047] The circuit boards used in this utility model include a decision board, a trigger board, a main control board, a slave control board, a main transformer board, a connection board, and an MCR board.

[0048] The controller targets the ideal power supply parameters of the power supply network, namely voltage, harmonic content, and power factor. It uses the actual measured reactive power demand, voltage, harmonic parameters, and target parameters of the power supply network as the control basis. The controller compares the control basis with the capacity of the FC controlled by the dedicated switch. If the switching conditions of the FC capacity controlled by one or more dedicated switches are met, the FC channel is switched on first. If there is overcompensation after the FC group is switched on, the controller compares the capacity with the capacity of the dynamic adjustment compensation reactor of each autotransformer to determine the number of adjustment stages.

[0049] This invention utilizes the concepts of fuzzy mathematics to establish a mathematical model and derives reactive power regulation criteria for fuzzy boundaries. Its key feature is that the fixed upper and lower limits of voltage and reactive power in the nine-zone diagram are transformed into fuzzy boundaries influenced by voltage. The width of these boundary regions can be adjusted according to specific switching boundary conditions, resulting in a twelve-zone fuzzy control algorithm. This fuzzy algorithm uses voltage, harmonics, and reactive power as control targets, achieving the ideal voltage and power factor required by the power supply network while minimizing the number of autotransformer voltage adjustments and FC switching operations.

[0050] This invention employs a dual-loop composite control regulation of power and current. The control algorithm combines instantaneous reactive power theory, fuzzy control algorithm, and feedforward control. It can complete the detection and dynamic tracking output of load reactive power changes within half a power frequency cycle, thereby accurately controlling the rapid response and compensation of the reactive power demand of the substation bus, achieving the goal of compensating for the reactive power demand of the bus, stabilizing the bus voltage, and improving the power factor of the bus.

Claims

1. A magnetically controlled dynamic compensation device for isolated grouping FC and MCR, characterized in that: Including isolated group FC cabinets and MCR magnetically controlled dynamic compensation cabinets; The isolation group FC cabinet is equipped with high-voltage disconnect switches, vacuum switches, zinc oxide surge arresters, high-voltage fuses, parallel capacitors, series reactors, and high-voltage live display devices; the high-voltage live display devices include interconnected high-voltage sensors and displays; The busbar incoming line is sequentially connected to a high-voltage disconnect switch, a vacuum switch, a high-voltage fuse, and a series reactor, and then connected to a parallel capacitor as one line. The parallel capacitor is connected in a star configuration and is connected in parallel with the discharge coil. The busbar incoming line also has two branches that are respectively connected to a high-voltage live display device and a zinc oxide surge arrester to form an FC channel. The MCR magnetically controlled dynamic compensation cabinet is equipped with a dry-type magnetically controlled reactor, a thyristor excitation box, a high-voltage live display, and a zinc oxide surge arrester. The busbar incoming line is connected to the dry-type magnetically controlled reactor, and the busbar incoming line also has two branches that are connected to the high-voltage live display device and the zinc oxide surge arrester, respectively.

2. The isolation grouping FC and MCR magnetically controlled dynamic compensation device according to claim 1, characterized in that: Several current transformers are connected to the busbar, and each current transformer is connected to an ammeter.

3. The isolation grouping FC and MCR magnetically controlled dynamic compensation device according to claim 1, characterized in that: In the thyristor excitation box, in the primary wiring circuit, In branch KK1, resistor R1 and capacitor C1 are connected in series to form branch 1. After branch 1 is connected in parallel with thyristor TV1, it is connected to fuse FU1. Thyristor protector FV1 is connected in parallel between the cathode of thyristor TV1 and the high voltage terminal of fuse FU1. The control electrode G1 of thyristor TV1 is connected to the G1 terminal of trigger board KG. The cathode K1 of thyristor TV1 is also connected to the K1 terminal of trigger board KG. In branch KK2, resistor R2 and capacitor C2 are connected in series to form branch 2. After branch 2 is connected in parallel with thyristor TV2, it is connected to fuse FU2. Thyristor protector FV2 is connected in parallel between the cathode of thyristor TV2 and the high voltage terminal of fuse FU2. The control electrode G2 of thyristor TV2 is connected to the G2 terminal of trigger board KG. The cathode K2 of thyristor TV2 is also connected to the K2 terminal of trigger board KG. The anode K21 of thyristor TV2 is connected to the first pin of switching power supply U. In branch DD1, resistor R3 and capacitor C3 are connected in series to form branch 3. After diode TD is connected in parallel in branch 3, fuse FU3 is connected. Thyristor protector FV3 is connected in parallel between the negative terminal of diode TD and the high voltage terminal of fuse FU3. The positive terminal D11 of diode TD is connected to the second pin of switching power supply U. The positive and negative terminals of the switching power supply U are connected to the Vin and GND terminals of the trigger board KG, respectively. The high-voltage terminals of branches KK1, KK2, and DD1 are respectively connected to the control terminals of the magnetically controlled reactor.

4. The isolation grouping FC and MCR magnetically controlled dynamic compensation device according to claim 1, characterized in that: The thyristor excitation box is also equipped with a heat sink.

5. The isolation grouping FC and MCR magnetically controlled dynamic compensation device according to claim 1, characterized in that: The dry-type magnetically controlled reactor has a cooling fan installed at the bottom, and the conductors are installed at the top via insulators.

6. The isolation grouping FC and MCR magnetically controlled dynamic compensation device according to claim 1, characterized in that: The MCR magnetic dynamic compensation cabinet has several top-mounted cooling fans.

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