A three-dimensional triangle roll core electromagnetic balance voltage regulating harmonic suppression energy-saving system

Abstract

The application discloses a three-dimensional triangular winding core electromagnetic balance voltage-regulating harmonic suppression energy-saving system and belongs to the technical field of power distribution, which comprises the following steps: an incoming line measurement and control module collects line voltage and current signals, performs analog-digital conversion and FFT spectrum analysis, determines an adjustment step and a voltage-regulating direction, and drives a main thyristor switch array to switch winding taps to realize voltage stabilization through optical fiber instruction issuing; an iron core magnetic flux detection coil collects magnetic communication signals and sends the signals into a harmonic reactive power treatment module, which completes current Park transformation relying on magnetic flux synchronous phase, and linkage capacitor and reactance bidirectional adjustment reactive power and harmonic suppression; a fault bypass control module collects fault characteristic quantities in real time, and outputs a bypass triggering signal to drive a bypass vacuum contactor to switch a bypass loop when the fault characteristic quantities exceed a limit; the application has the functions of three-phase electromagnetic balance voltage stabilization, harmonic treatment, reactive power compensation and fault seamless bypass, and is suitable for 10kV distribution network energy-saving treatment scenes.

Description

Technical Field

[0001] This invention belongs to the field of power distribution technology, specifically a three-dimensional triangular coiled iron core electromagnetic balance voltage regulation harmonic suppression energy-saving system. Background Technology

[0002] Currently, 10kV distribution networks commonly suffer from problems such as three-phase voltage imbalance, voltage deviation, harmonic distortion, and reactive power deficit. These issues not only increase losses and energy consumption in distribution equipment but also easily lead to faults such as motor overheating, metering deviations, and relay protection malfunctions. Existing voltage regulating equipment often uses planar laminated iron cores, resulting in asymmetrical magnetic circuits, high leakage flux, and high no-load losses. The voltage regulating and harmonic mitigation units operate independently, lacking a coordinated mechanism and failing to synchronously regulate voltage and reactive power harmonics based on the core magnetic flux conditions. Traditional voltage regulating range switching control logic is simple, with fixed voltage deviation adjustment steps, resulting in poor voltage regulation accuracy and large fluctuations. Furthermore, existing equipment fault handling solutions are incomplete, possessing only simple alarm functions. When faults such as core overheating, winding overcurrent, or thyristor abnormalities occur, the main voltage regulating unit cannot be quickly isolated, requiring overall power outage for maintenance and interruption of power supply to users, leading to insufficient power supply reliability. In addition, conventional harmonic mitigation devices rely on grid voltage synchronization signals, making them susceptible to voltage distortion interference, which can cause phase-locking inaccuracies and reduce the effectiveness of reactive power compensation and harmonic suppression. Based on the aforementioned deficiencies in the existing technology, this invention proposes a three-dimensional triangular coiled iron core electromagnetic balance voltage regulation harmonic suppression energy-saving system. It adopts a spatially symmetrical three-dimensional triangular amorphous coiled iron core to reduce magnetic losses, realizes the linkage and synergy of voltage regulation and harmonic reactive power control, and is equipped with a fault bypass switching circuit to take into account both energy-saving management and uninterrupted power supply requirements. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention proposes a three-dimensional triangular wound iron core electromagnetic balance voltage regulation and harmonic suppression energy-saving system. The incoming line monitoring and control module collects line voltage and current signals, performs analog-to-digital conversion and FFT spectrum analysis to determine the adjustment step size and voltage regulation direction, and drives the main thyristor switch array to switch winding taps via fiber optic commands to achieve voltage stabilization. The iron core magnetic flux detection coil collects magnetic flux signals and sends them to the harmonic and reactive power mitigation module. Based on the magnetic flux synchronization phase, the current Park transformation is completed, and the capacitor reactance is linked to bidirectionally adjust reactive power and suppress harmonics. The fault bypass control module collects fault characteristic quantities in real time; if limits are exceeded, it outputs a bypass trigger signal to drive the bypass vacuum contactor to switch the bypass circuit. This invention combines three-phase electromagnetic balance voltage regulation, harmonic mitigation, reactive power compensation, and seamless fault bypass functions, making it suitable for 10kV distribution network energy-saving scenarios.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A three-dimensional triangular coiled iron core electromagnetic balance voltage regulation harmonic suppression energy-saving system is applied to 10kV power distribution energy-saving management equipment. The 10kV power distribution energy-saving management equipment includes a three-dimensional triangular coiled iron core electromagnetic balance body. The three-dimensional triangular coiled iron core electromagnetic balance body is composed of three sets of iron core single frames of the same specification spliced ​​into a three-phase symmetrical three-dimensional structure. The equipment is equipped with an incoming line measurement and control module, a harmonic reactive power management module, a fault bypass control module, and a bypass switching execution module.

[0006] The incoming line measurement and control module is used to connect to the 10kV power distribution line, collect operating condition data and send it to the built-in control unit to generate voltage regulation command, and then output the voltage regulation command to the three-dimensional triangular coiled iron core electromagnetic balance body to drive the three-dimensional triangular coiled iron core electromagnetic balance body to perform voltage stabilization action and synchronously output the iron core magnetic flux signal.

[0007] The harmonic reactive power mitigation module is used to receive the magnetic flux signal of the iron core, detect grid harmonics based on the built-in SVG topology and adjust reactive power bidirectionally, and raise the system power factor in conjunction with the matching capacitor and reactor device. After completion, it sends a normal operation signal to the fault bypass control module.

[0008] The fault bypass control module is used to continuously collect equipment operation fault signals of the electromagnetic balance body of the three-dimensional triangular coil iron core, and send the equipment operation fault signals as bypass trigger commands to the bypass switching execution module.

[0009] The bypass switching execution module connects the incoming line monitoring and control module with the electromagnetic balance body of the three-dimensional triangular coiled iron core. After receiving the bypass trigger command, it switches the bypass circuit to isolate the electromagnetic balance body of the three-dimensional triangular coiled iron core in the fault state. The power grid continues to supply power through the bypass, and at the same time, the bypass status is transmitted back to the incoming line monitoring and control module.

[0010] Specifically, the incoming line measurement and control module includes a voltage transformer, a current transformer, a signal conditioning circuit, an analog-to-digital conversion circuit, and a built-in control unit;

[0011] The primary side of the voltage transformer is connected to phase A, phase B, phase C and neutral line of the 10kV distribution line, and the secondary side of the voltage transformer outputs a low-voltage analog voltage signal that reflects the phase voltage and line voltage of the line.

[0012] The primary side of the current transformer is respectively connected to the A-phase, B-phase, and C-phase outgoing terminals of the 10kV distribution line, and the secondary side of the current transformer outputs a low-voltage analog current signal that reflects the line load current.

[0013] The signal conditioning circuit receives low-voltage analog voltage signals and low-voltage analog current signals, filters and amplifies them, and outputs conditioned analog voltage signals and conditioned analog current signals.

[0014] The analog-to-digital conversion circuit is based on a successive approximation analog-to-digital converter to synchronously sample the conditioned analog voltage signal and the conditioned analog current signal, and output digital voltage signal and digital current signal.

[0015] The built-in control unit performs spectral analysis on digital voltage and digital current signals based on the Fast Fourier Transform algorithm. Based on the spectral analysis results, it extracts the fundamental voltage RMS value, fundamental current RMS value, and fundamental phase difference between voltage and current. It then generates a voltage regulation command based on the deviation between the fundamental voltage RMS value and the preset rated voltage reference value. Finally, the voltage regulation command is output to the thyristor switch array driver board of the three-dimensional triangular coiled iron core electromagnetic balance body through the optical fiber communication interface.

[0016] Specifically, the built-in control unit marks the fundamental voltage RMS value as... The preset rated voltage reference value is marked as The built-in control unit calculates the voltage deviation percentage. The built-in control unit has a pre-stored adjustment step size mapping table. Each row of the adjustment step size mapping table contains a voltage deviation percentage range and a corresponding adjustment step size value. The built-in control unit uses... Using the query key, the voltage deviation percentage range in the adjustment step size mapping table is traversed using a linear lookup table method. When the voltage deviation falls within any voltage deviation percentage range, the built-in control unit extracts the adjustment step size value corresponding to the voltage deviation percentage range as the current adjustment step size; simultaneously, it... Perform sign discrimination, if If the value is positive, a voltage regulation command containing the voltage increase direction indicator and the current adjustment step size is generated. If the value is negative, a voltage regulation command containing the voltage reduction direction indicator and the current adjustment step size will be generated. If the value is zero, a voltage regulation command is generated that includes maintaining the direction indicator and setting the step size to zero.

[0017] Specifically, the three-dimensional triangular coiled iron core electromagnetic balance body includes three sets of iron core single frames of the same specification, high voltage winding, low voltage winding, and thyristor switch array;

[0018] Each set of iron core frames is formed by winding amorphous alloy strip. The cross-sectional shape of the iron core frame is rectangular. The three sets of iron core frames are spliced ​​together in a spatially symmetrical manner with an included angle of 120 degrees between each pair to form a closed magnetic circuit. The closed magnetic circuit has three magnetic pillars and three magnetic yokes.

[0019] Both the high-voltage winding and the low-voltage winding adopt a layered and segmented winding structure and are respectively sleeved on three magnetic pillars. The tap end of each phase of the high-voltage winding is connected to the corresponding input end of the thyristor switch array, and the output end of each phase of the low-voltage winding serves as the voltage regulation output end of the electromagnetic balance body of the three-dimensional triangular wound iron core.

[0020] The thyristor switch array is a three-phase independent controllable structure. Each phase of the thyristor switch array contains multiple anti-parallel thyristor pairs. Each anti-parallel thyristor pair corresponds to a winding tap position. After receiving the voltage regulation command transmitted by the optical fiber communication interface, the drive board of the thyristor switch array performs tap decoding and switching operations according to the direction indicator and step size value in the voltage regulation command.

[0021] Specifically, the step-level decoding and switching operation based on the direction identifier and step size value in the voltage regulation command includes: the driver board first parses the adjustment step size value from the voltage regulation command; the driver board converts the adjustment step size value into a parallel output binary code based on a binary encoder decoder; then it parses the adjustment direction identifier from the voltage regulation command and determines the step direction based on the adjustment direction identifier; the driver board reads the current gear address code corresponding to the anti-parallel thyristor pair currently in the conducting state, and sets the current gear address according to the step direction. The target gear address code is obtained by performing addition or subtraction operations on the binary code of the target gear and the step size binary code. The target gear address code is latched and output to the gate drive gating array of each anti-parallel thyristor pair. The gating branch in the gate drive gating array that matches the target gear address code outputs a turn-on drive pulse to the gate of the corresponding anti-parallel thyristor pair. All gating branches in the gate drive gating array that do not match the target gear address code stop outputting drive pulses, so that the anti-parallel thyristor pair of the currently closed gear is turned off and the anti-parallel thyristor pair of the target gear is turned on.

[0022] Specifically, the three-dimensional triangular coiled iron core electromagnetic balance body also includes an iron core magnetic flux detection coil, which is wound at a preset height position on three magnetic pillars respectively. The secondary side of the iron core magnetic flux detection coil outputs a differential voltage signal that reflects the real-time magnetic flux change rate of each magnetic pillar.

[0023] The electromagnetic balance body of the three-dimensional triangular coiled iron core also includes a magnetic flux signal conditioning circuit. The magnetic flux signal conditioning circuit receives the differential voltage signals of the three magnetic pillars, performs time integration operation on the differential voltage signals based on the active integrator circuit constructed by the integrated operational amplifier, and outputs a DC magnetic flux signal that is proportional to the real-time magnetic flux of each magnetic pillar.

[0024] Specifically, the harmonic reactive power mitigation module includes an SVG main control unit, a grid-connected reactor, and the matching capacitor-reactor device;

[0025] The SVG main control unit has a built-in synchronization signal acquisition interface. The synchronization signal acquisition interface receives the DC flux signals of the three magnetic columns transmitted by the flux signal conditioning circuit. Based on the DC flux signals of the three magnetic columns, vector synthesis calculation is performed to obtain the three-phase composite flux vector. The phase-locked loop detects the zero-crossing point of the three-phase composite flux vector based on the zero-crossing comparator and generates a synchronization phase angle that is synchronized with the positive sequence component of the grid voltage fundamental wave according to the zero-crossing trigger time. Based on the synchronization phase angle, Park transformation is performed on the grid-connected reactor current signal to decompose the grid-connected reactor current signal into active current component and reactive current component. The active current component is subtracted from the preset active current reference value to obtain the active deviation, and the reactive current component is subtracted from the preset reactive current reference value to obtain the reactive deviation.

[0026] Specifically, after completing voltage regulation and harmonic suppression, the harmonic reactive power control module sends a normal operation signal to the fault bypass control module. The normal operation signal is a periodic square wave pulse signal. The high-level duration of the square wave pulse signal is a preset first time length, the low-level duration of the square wave pulse signal is a preset second time length, the amplitude of the square wave pulse signal is DC 24V, and the square wave pulse signal is transmitted to the switch input interface of the fault bypass control module through a shielded twisted pair cable.

[0027] Specifically, the fault bypass control module includes a fault signal acquisition unit and a fault decision unit;

[0028] The fault signal acquisition unit outputs digital fault characteristic values ​​based on the analog-to-digital converter; the digital fault characteristic values ​​include digital values ​​of core temperature, winding current, thyristor voltage drop, and drive feedback status of the thyristor switch array.

[0029] After receiving the digital fault characteristic value, the fault judgment unit compares the digital value of the core temperature with the pre-stored upper limit threshold of the core temperature, the digital value of the winding current with the pre-stored upper limit threshold of the winding current, the digital value of the thyristor voltage drop with the pre-stored upper limit threshold of the thyristor voltage drop, and performs a bitwise operation comparison between the digital value of the drive feedback status and the pre-stored normal code of the drive feedback status. If the digital value of the core temperature is greater than the upper limit threshold of the core temperature, or the digital value of the winding current is greater than the upper limit threshold of the winding current, or the digital value of the thyristor voltage drop is greater than the upper limit threshold of the thyristor voltage drop, or the digital value of the drive feedback status does not match the normal code of the drive feedback status, the fault judgment unit determines that there is a fault signal in the equipment operation and uses the determination result as a bypass trigger command. The bypass trigger command is a level trigger signal. When the fault judgment unit determines that there is a fault signal in the equipment operation, the bypass trigger command is a high-level valid signal; when the fault judgment unit determines that there is no fault signal in the equipment operation, the bypass trigger command is a low-level invalid signal. The bypass trigger command is output to the solid-state relay control terminal of the bypass switching execution module through an opto-isolator.

[0030] Specifically, after receiving the bypass trigger command, the solid-state relay control terminal of the bypass switching execution module closes the output contact of the solid-state relay, which is connected in series in the closing control circuit of the bypass three-phase vacuum contactor. When the output contact of the solid-state relay closes, the closing coil of the bypass three-phase vacuum contactor built into the bypass switching execution module is energized, the main contact of the bypass three-phase vacuum contactor closes, and the power grid continues to supply power through the main circuit of the bypass three-phase vacuum contactor. At the same time, the auxiliary normally open contact of the bypass three-phase vacuum contactor closes. One end of the auxiliary normally open contact is connected to the positive terminal of the DC power supply, and the other end of the auxiliary normally open contact is connected to the bypass status feedback signal line, which is connected to the digital input port of the incoming line measurement and control module.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] 1. This invention proposes a three-dimensional triangular wound iron core electromagnetic balance voltage regulation harmonic suppression energy-saving system. It employs three sets of amorphous alloy iron cores arranged in a 120° spatially symmetrical three-dimensional triangular closed magnetic circuit. Compared to traditional planar laminated iron cores, this system offers a more balanced magnetic circuit, less leakage flux, significantly reduced no-load losses, and excellent three-phase electromagnetic balance capability. The incoming line measurement and control module collects line electrical parameters through current transformers, accurately calculates voltage deviation through FFT spectrum analysis, and adaptively adjusts the step size by matching the deviation interval table. Combined with thyristor array layered and segmented winding tap voltage regulation, the system achieves high voltage stabilization accuracy and low voltage fluctuation. The system relies on the iron core magnetic flux detection coil to obtain real-time magnetic flux signals as the SV synchronization reference, eliminating interference from grid voltage distortion on the phase-locked loop. Through Park transformation to decompose current components, it links with capacitor and reactor devices to bidirectionally regulate reactive power and filter harmonics. Voltage regulation and harmonic reactive power management work in synergy to synchronously improve the system power factor, effectively reducing distribution network line losses and achieving comprehensive energy savings.

[0033] 2. This invention proposes a three-dimensional triangular wound iron core electromagnetic balance voltage regulation harmonic suppression energy-saving system, equipped with a complete fault bypass control and switching execution architecture. It collects multi-dimensional fault characteristic quantities such as iron core temperature, winding current, thyristor voltage drop, and drive feedback in real time, and uses multiple thresholds to jointly determine faults, which is sensitive and reliable. After a fault occurs, it can quickly output a bypass trigger signal to drive the three-phase vacuum contactor to close the bypass circuit, automatically isolate the fault voltage regulation body, and ensure uninterrupted power supply to the power grid. At the same time, it transmits the bypass status back to the measurement and control module to achieve closed-loop monitoring of the status. The overall system integrates electromagnetic balance voltage regulation, harmonic suppression, reactive power compensation, and seamless fault bypass. The magnetic circuit structure is energy-saving, the control logic is adaptive, and the fault handling is uninterrupted. It takes into account the power quality management and power supply reliability of the distribution network and is suitable for long-term power saving management scenarios of 10kV distribution lines. Attached Figure Description

[0034] Figure 1 This is a flowchart illustrating the principle of a three-dimensional triangular wound iron core electromagnetic balance voltage regulation harmonic suppression energy-saving system according to the present invention;

[0035] Figure 2 This is a schematic diagram of an electromagnetic balance voltage regulation harmonic suppression energy-saving system architecture for a three-dimensional triangular coiled iron core according to the present invention. Detailed Implementation

[0036] This embodiment takes the power quality management of a 10kV industrial park integrated distribution substation as the application scenario. The park has a precision electronic processing workshop, frequency conversion production line, high-power rectifier equipment, central air conditioning unit and charging pile concentration area. All kinds of equipment are nonlinear impact loads, and the load fluctuation range is large throughout the day. At the same time, the power load carried by the three-phase lines is significantly different, and there is a serious three-phase imbalance problem. Conventional voltage regulation and compensation equipment on the market generally suffers from several prominent shortcomings: The internal magnetic circuit uses a planar structure, resulting in inconsistent lengths of the three-phase magnetic circuits and causing three-phase voltage imbalance; reliance on mechanical tap switches for voltage regulation leads to slow response times, unable to keep up with rapid load fluctuations; the use of only fixed-capacity capacitors limits the handling of single-frequency harmonics, offering only weak suppression over a wide range of harmonics; equipment failure directly cuts off the main power supply circuit, potentially causing product scrapping and equipment downtime damage to precision equipment in the factory; the cores often use ordinary silicon steel, resulting in high no-load operating losses and significant electricity costs over extended periods; the voltage regulation unit and harmonic compensation unit lack synchronous magnetic flux signal linkage, with the two control logics operating independently, leading to conflicting adjustment actions. Existing equipment cannot simultaneously meet the multiple requirements of high-precision, stable power supply, energy saving, harmonic mitigation, and uninterrupted power supply protection in industrial plants.

[0037] Please see Figures 1-2 The present invention provides an embodiment of a three-dimensional triangular coiled iron core electromagnetic balance voltage regulation harmonic suppression energy-saving system, which is applied to a 10kV power distribution energy-saving treatment equipment. The 10kV power distribution energy-saving treatment equipment includes a three-dimensional triangular coiled iron core electromagnetic balance body. The three-dimensional triangular coiled iron core electromagnetic balance body is composed of three sets of iron core single frames of the same specification spliced ​​into a three-phase symmetrical three-dimensional structure. The equipment is equipped with an incoming line measurement and control module, a harmonic reactive power treatment module, a fault bypass control module, and a bypass switching execution module.

[0038] The incoming line measurement and control module is used to connect to the 10kV power distribution line, collect operating condition data and send it to the built-in control unit to generate voltage regulation command, and then output the voltage regulation command to the three-dimensional triangular coiled iron core electromagnetic balance body to drive the three-dimensional triangular coiled iron core electromagnetic balance body to perform voltage stabilization action and synchronously output the iron core magnetic flux signal.

[0039] The incoming line measurement and control module includes a voltage transformer, a current transformer, a signal conditioning circuit, an analog-to-digital conversion circuit, and a built-in control unit.

[0040] The primary side of the voltage transformer is connected to phases A, B, and C of a 10kV distribution line and the neutral line. The four high-voltage cables are individually run through flame-retardant insulating bushings, and the bushings are filled with fire-resistant sealant to avoid the risk of creepage and leakage in the high-voltage lines. The secondary side of the voltage transformer outputs a low-voltage analog voltage signal that reflects the phase voltage and line voltage of the line. All secondary signal lines use twisted-pair shielded cables, and the shielding layer is grounded only at one end to prevent external noise from interfering with the sampling signal. The low-voltage analog signal output by the secondary line can completely and synchronously reflect the real-time fluctuations of the line voltage. At the same time, the transformer has a built-in high-voltage fuse protection component. Once an overvoltage or short-circuit fault occurs in the primary side line, it will automatically fuse to prevent the downstream low-voltage measurement and control circuit from being damaged by high voltage breakdown.

[0041] The primary side of the current transformer is respectively connected to the A-phase, B-phase, and C-phase outgoing terminals of the 10kV distribution line. The secondary side of the current transformer outputs a low-voltage analog current signal that reflects the line load current. The secondary circuit of the current transformer must be equipped with a separate grounding terminal to prevent high-voltage breakdown of the equipment caused by an open circuit in the secondary circuit. Each set of secondary circuits is connected in series with a miniature fuse to avoid short circuits in the secondary circuit that could burn out the transformer body.

[0042] The signal conditioning circuit receives low-voltage analog voltage signals and low-voltage analog current signals, filters out power frequency noise based on an RC filter network, and adjusts the signal amplitude to the input range of the analog-to-digital converter based on an operational amplifier proportional amplifier circuit, and outputs conditioned analog voltage signals and conditioned analog current signals.

[0043] Furthermore, the signal conditioning circuit is a four-layer shielded PCB board. Each voltage and current acquisition signal is equipped with an independent processing channel, and the channels do not interfere with each other. The complete processing process of a single signal is as follows: the low-voltage analog signal output from the external voltage transformer and current transformer is used as the input of this stage. First, a current-limiting resistor is connected to complete the initial impedance matching of the line, and a transient suppression diode is connected in parallel to form a protection branch. The current-limiting resistor limits the amplitude of the instantaneous inrush current, and the transient suppression diode clamps the high voltage spikes caused by lightning strikes and switching operations, outputting the original analog signal after safety protection. The original analog signal after protection is used as the input and connected to a second-order resistor-capacitor filter network. The second-order resistor-capacitor filter network filters out the high-frequency noise derived from the 50Hz power frequency, thyristor switching pulses, and harmonic glitches, retaining only the pure 50Hz effective mode. The analog signal is processed to output a clean analog signal after noise reduction. The clean analog signal is then fed into a proportional amplifier circuit composed of a high-precision low-temperature operational amplifier. For voltage signals, amplitude attenuation is performed, and for current signals, voltage conversion is performed. Both types of signals are adjusted to the standard level range adapted by the analog-to-digital converter circuit. An isolation resistor is connected in series at the output of the amplifier circuit to block the inrush current, and an amplitude-standardized analog signal is output. The amplitude-standardized analog signal is then connected to a voltage follower for impedance conversion. The voltage follower improves the signal's load-carrying capacity and eliminates signal attenuation caused by impedance mismatch between the preceding and following stages. Finally, a fully denoised, uniformly amplitude, and stable-load-carrying standardized analog voltage signal and a standardized analog current signal are output. The two signals are directly sent to the corresponding sampling channels of the analog-to-digital converter circuit, completing the full-link closed-loop conditioning of the single-channel analog signal.

[0044] The analog-to-digital conversion circuit is based on a successive approximation analog-to-digital converter to synchronously sample the conditioned analog voltage signal and the conditioned analog current signal, and output digital voltage signal and digital current signal.

[0045] Furthermore, the analog-to-digital conversion circuit is equipped with a multi-channel synchronous sampling conversion chip. The specific implementation steps of the analog-to-digital conversion circuit include: the built-in control unit generates a synchronous sampling trigger signal and sends it outward; the synchronous sampling conversion chip receives the trigger signal as its input; the rising edge of the trigger signal synchronously turns on six acquisition channels; the six acquisition channels receive standardized analog voltage signals and standardized analog current signals output by the signal conditioning circuit, eliminating the timing deviation caused by time-division multiplexing, and outputting six synchronously locked analog acquisition signals; the synchronous sampling conversion chip performs analog-to-digital conversion processing on the six analog acquisition signals one by one, converting the continuous analog signals into discrete digital voltage data and discrete digital current data, and outputting six synchronously matched digital sampling data; the synchronous sampling conversion chip stores all digital sampling data in its own built-in register to complete temporary buffering; after the built-in register buffering is completed, the entire set of digital sampling data is output in batches through a serial communication line and transmitted to the circular storage buffer set in the built-in control unit; the circular storage buffer cyclically stores all digital sampling data, completing a single round of complete synchronous sampling closed-loop process; the buffer outputs the buffered data to the built-in control unit for spectrum analysis calculation.

[0046] The built-in control unit performs spectral analysis on the digital voltage and digital current signals based on the Fast Fourier Transform algorithm. Based on the spectral analysis results, it extracts the fundamental voltage RMS value, the fundamental current RMS value, and the fundamental phase difference between the voltage and current. It then generates a voltage regulation command based on the deviation between the fundamental voltage RMS value and a preset rated voltage reference value. Finally, the voltage regulation command is output to the thyristor switch array driver board of the three-dimensional triangular coiled iron core electromagnetic balance body via an optical fiber communication interface. The voltage regulation command includes an adjustment direction indicator and an adjustment step size value. The Fast Fourier Transform algorithm is existing technology in this field and is not an inventive solution of this application; therefore, it will not be elaborated upon here.

[0047] The built-in control unit marks the fundamental voltage RMS value as... The preset rated voltage reference value is marked as The built-in control unit calculates the voltage deviation percentage. The built-in control unit has a pre-stored adjustment step size mapping table. Each row of the adjustment step size mapping table contains a voltage deviation percentage range and a corresponding adjustment step size value. The built-in control unit uses... Using the query key, the voltage deviation percentage range in the adjustment step size mapping table is traversed using a linear lookup table method. When the voltage deviation falls within any voltage deviation percentage range, the built-in control unit extracts the adjustment step size value corresponding to the voltage deviation percentage range as the current adjustment step size; simultaneously, it... Perform sign discrimination, if If the value is positive, a voltage regulation command containing the voltage increase direction indicator and the current adjustment step size is generated. If the value is negative, a voltage regulation command containing the voltage reduction direction indicator and the current adjustment step size will be generated. If the value is zero, a voltage regulation command is generated that includes maintaining the direction indicator and setting the step size to zero.

[0048] Optionally, in this embodiment, the built-in control unit uses an industrial-grade high-performance microcontroller with a high main operating clock frequency, built-in large-capacity high-speed running memory and local flash memory. The flash memory partitions store various equipment operating thresholds, gear mapping tables, factory calibration parameters, equipment operating programs, seven days of historical operating data, and fault logs. The hardware peripherals integrate multiple fiber optic communication interfaces, a remote 4G communication module, multiple digital signal input / output ports, and an internal parallel data interaction bus. The program drive is divided into four layers of hierarchical scheduling. The four layers of programs run independently without blocking each other, and the overall scheduling cycle is extremely short, ensuring real-time response of the entire control logic: The first layer, the hardware driver layer, is responsible for ADC sampling, fiber optic transceiver, digital port reading and writing, and internal bus data interaction; the second layer, the algorithm calculation layer, is responsible for spectrum hierarchical analysis, voltage deviation calculation, gear lookup table, and voltage regulation command encoding; the third layer, the data interaction layer, is responsible for internal bus data reading and writing, remote communication message packaging, and fault data forwarding; the fourth layer, the status monitoring layer, continuously collects bypass operating status, magnetic flux feedback signals, and self-test data of other modules.

[0049] Furthermore, the voltage regulation command is packaged into fixed-length binary messages, which are divided into two parts: the first part stores the regulation direction indicator, and the second part stores the matched voltage regulation range. A check mark is added at the end of the message to prevent signal distortion and errors during fiber optic transmission. The complete command message is transmitted in the form of optical signals to the thyristor switch driver board of the three-dimensional triangular coiled iron core through the fiber optic communication interface. Fiber optic transmission is fast and has extremely low transmission delay, while achieving complete electrical isolation and avoiding control signal corruption caused by electromagnetic interference on the high-voltage side.

[0050] The three-dimensional triangular coiled iron core electromagnetic balancing unit is the core power component for electromagnetic voltage regulation in the entire equipment. The entire unit is placed in a separate compartment in the middle of the cabinet, with shock-absorbing rubber pads at the bottom and flame-retardant sound-absorbing cotton filling the perimeter to reduce vibration and noise during operation. The three-dimensional triangular coiled iron core electromagnetic balancing unit includes three sets of identical iron core frames, a high-voltage winding, a low-voltage winding, a thyristor switch array, an iron core magnetic flux detection coil, and a magnetic flux signal conditioning circuit. By relying on the 120-degree spatial symmetrical arrangement of the three iron core frames to form a closed magnetic circuit, the three-phase magnetic circuit length and magnetic resistance are completely consistent, fundamentally solving the inherent defects of three-phase magnetic flux offset and natural three-phase voltage imbalance in traditional planar iron core transformers. Combined with a contactless thyristor tap changer, it achieves millisecond-level smooth and graded voltage regulation, synchronously outputting real-time magnetic flux signals to the SVG module for grid synchronization and phase locking. Each core frame is formed by winding amorphous alloy strip. The strip is extremely thin, with high saturation magnetic flux density. Its no-load operation loss is far lower than that of traditional silicon steel sheet materials, and its hysteresis loss is only 1 / 5 of that of ordinary silicon steel sheets. This can significantly reduce the power loss generated by the continuous operation of the equipment. The surface of the strip is uniformly sprayed with a high-temperature resistant insulating coating with high interlayer insulation withstand voltage standards to eliminate eddy current losses between winding layers. After winding, the entire strip is immersed in high-temperature resistant insulating resin and cured at a high temperature and constant temperature to eliminate internal stress generated by winding, improve the overall mechanical strength of the core, and suppress vibration and noise during equipment operation. The number of winding turns, cross-sectional dimensions, and magnetic circuit length of the three core frames are all completely consistent to ensure that there is no deviation in the three-phase magnetic circuit parameters. The cross-sectional shape of the core frame is rectangular. The three core frames are spliced ​​together in a spatially symmetrical manner with an included angle of 120 degrees between each pair to form a closed magnetic circuit. The closed magnetic circuit has three magnetic pillars and three magnetic yokes. Both the high-voltage and low-voltage windings employ a layered, segmented winding structure, each wound around a magnetic post. Each phase tap of the high-voltage winding is connected to the corresponding input terminal of the thyristor switch array, while each phase output terminal of the low-voltage winding serves as the voltage regulation output terminal of the electromagnetic balance body of the three-dimensional triangular wound iron core. The thyristor switch array is a three-phase independently controllable structure. Each phase of the thyristor switch array contains multiple anti-parallel thyristor pairs, each corresponding to a winding tap position. After receiving the voltage regulation command transmitted through the fiber optic communication interface, the drive board of the thyristor switch array performs position decoding and switching operations based on the direction indicator and step size value in the voltage regulation command. The core magnetic flux detection coils are wound at preset heights on the three magnetic pillars. The secondary side of the core magnetic flux detection coils outputs differential voltage signals that reflect the real-time magnetic flux change rate of each magnetic pillar. The magnetic flux signal conditioning circuit receives the differential voltage signals from the three magnetic pillars, performs time integration on the differential voltage signals based on an active integrator circuit constructed using an integrated operational amplifier, and outputs a DC magnetic flux signal that is proportional to the real-time magnetic flux of each magnetic pillar.

[0051] The step-level decoding and switching operation based on the direction identifier and step size value in the voltage regulation command includes: the driver board first parses the adjustment step size value from the voltage regulation command; the driver board converts the adjustment step size value into a parallel output binary code based on a binary encoder decoder; then it parses the adjustment direction identifier from the voltage regulation command and determines the step direction based on the adjustment direction identifier; the driver board reads the current gear address code corresponding to the anti-parallel thyristor pair currently in the conducting state, and modifies the current gear address code with the step direction. The target gear address code is obtained by performing addition or subtraction operations on the step binary code; the target gear address code is latched and output to the gate drive gating array of each anti-parallel thyristor pair; the gating branch in the gate drive gating array that matches the target gear address code outputs a turn-on drive pulse to the gate of the corresponding anti-parallel thyristor pair; all gating branches in the gate drive gating array that do not match the target gear address code stop outputting drive pulses, so that the anti-parallel thyristor pair of the currently closed gear is turned off and the anti-parallel thyristor pair of the target gear is turned on.

[0052] Furthermore, the core flux detection coil is wound at a predetermined height position on each of the three magnetic pillars. The secondary side of the core flux detection coil outputs a differential voltage signal reflecting the real-time flux change rate of each magnetic pillar, including:

[0053] (1) The operator selects three sets of three-dimensional triangular iron core magnetic columns with the same specifications. The total height of a single magnetic column is set to 1200 mm in advance. The winding center position of the magnetic flux detection coil is set at 700 mm of the magnetic column height as the preset height point. The height point is selected based on the uniform magnetic flux distribution in the middle of the magnetic column and the absence of end leakage magnetic interference. Each magnetic column is equipped with an independent magnetic flux detection coil. The coil uses 0.2 mm diameter high temperature resistant enameled copper wire. A single coil is wound 1500 turns continuously. During the winding process, the turns are kept tightly fitted and a 0.1 mm insulating film is laid between the layers. The number of turns, winding height and wire specifications of the coils of the three sets of magnetic columns are all kept in the same standard. After the winding is completed, the first and last two leads of each coil are led out separately as secondary output terminals. All leads are externally extended using one-meter long twisted shielded wires. The shielding layer is grounded at a single point at the end of the line to eliminate external electromagnetic noise interference.

[0054] (2) Connect the two leads of the magnetic flux detection coil corresponding to each magnetic column to the three-channel independent terminal block. Set a megohm isolation resistor in series in each lead circuit. The parameter setting value of the isolation resistor is fixed at one megohm. The purpose of setting it is to block the reverse current of the back-end circuit from damaging the detection coil. Add an insulating partition between the three coil output circuits to achieve channel electrical isolation and avoid mutual coupling and crosstalk of the three-phase magnetic flux signals. The three terminal outputs correspond to three independent signal transmission channels, which are marked as A-phase magnetic column magnetic flux channel, B-phase magnetic column magnetic flux channel, and C-phase magnetic column magnetic flux channel respectively.

[0055] (3) Capturing the change of magnetic flux in the magnetic column and converting it into the original differential voltage signal: During normal operation of the equipment, the magnetic flux inside the three-dimensional triangular iron core magnetic circuit will continuously increase or decrease periodically with the fluctuation of the grid voltage load. The magnetic flux passing through the magnetic flux detection coil changes continuously with time. According to the law of electromagnetic induction, the coil will automatically generate an induced electromotive force. The magnitude of the induced electromotive force and the rate of change of magnetic flux with time form a linear correspondence. At this time, the secondary side terminal of the coil will directly output the original differential voltage signal. When the magnetic flux of the magnetic column rises at a constant speed, the positive differential voltage is output. When the magnetic flux falls at a constant speed, the reverse differential voltage is output. When the magnetic flux remains constant, the differential voltage output value is stable at zero volts. The detection coils corresponding to the three phase magnetic columns independently output three independent differential voltage original signals. The three signals are output synchronously in real time without time offset.

[0056] (4) Perform pre-processing basic protection on the three original differential voltage signals: A transient suppression diode of the same model is connected in parallel on each differential voltage transmission line. The clamping voltage parameter of the transient suppression diode is uniformly set to 12 volts. This parameter is fixed and cannot be adjusted. It is used to absorb the instantaneous high voltage spike pulse generated by the power grid impact when the thyristor switches are activated. At the same time, a 200-ohm current limiting resistor is connected in series on each signal line. The current limiting resistor parameter is set to 200 ohms to limit the amplitude of the instantaneous impact current and prevent the back-end acquisition circuit devices from breaking down. After the protection circuit is processed, the three differential voltage signals retain the voltage change characteristics corresponding to the rate of change of magnetic flux. Only the over-range instantaneous interference pulse is filtered out. The voltage waveform corresponding to the original magnetic flux change is not distorted.

[0057] (5) The three differential voltage signals after protection are synchronously transmitted to the corresponding three active integration input channels inside the magnetic flux signal conditioning circuit through shielded twisted pair cables. The length of the three signal transmission cables is strictly controlled within two meters. The cable routing is far away from the high-voltage cables of the thyristor power circuit. The three-phase differential voltage signals are kept in sync throughout the process. The continuous analog voltage waveform that can fully reflect the real-time magnetic flux change rate of each magnetic column is completely preserved. There are no distortion problems such as signal delay, amplitude attenuation, and phase shift. This provides complete original differential voltage input material for the integration operation to restore the real magnetic flux.

[0058] Furthermore, the magnetic flux signal conditioning circuit receives the differential voltage signals from the three magnetic pillars, performs time integration on the differential voltage signals using an active integrator circuit built based on an integrated operational amplifier, and outputs a DC magnetic flux signal proportional to the real-time magnetic flux of each magnetic pillar, including:

[0059] (1) Complete the channel isolation access operation of the three-phase differential voltage signal: The magnetic flux signal conditioning circuit is divided into three completely identical signal processing channels, which correspond to the three differential voltage signals output by the A-phase magnetic column, B-phase magnetic column and C-phase magnetic column of the three-dimensional triangular iron core. Each channel input terminal is separately equipped with a terminal block. The differential voltage signal lines transmitted by the three shielded twisted pairs are respectively connected to the three terminals. The series resistance of each input circuit is set to a 10kΩ metal film input resistor. The resistor parameter is fixed at 10kΩ. The setting function is to match the output impedance of the coil and limit the instantaneous impact current from flowing into the operational amplifier input terminal. Insulation isolation partitions are installed between the three channels to prevent the three-phase differential voltage signals from being coupled and crosstalked between channels, ensuring that the three signals are synchronized in time and without phase shift, and completely retaining the original analog voltage waveform of each channel reflecting the magnetic flux change rate of the magnetic column.

[0060] (2) Complete the selection and standardized configuration of core components and parameters of the active integrating circuit: Each channel is independently equipped with a TL082 dual-channel integrated operational amplifier. A single-channel operational amplifier unit is selected to build an inverting active integrating topology. The operational amplifier is supplied with a ±12V dual-channel DC power supply. The power supply voltage parameters are fixed at 12V and -12V to ensure that the integrating output voltage can completely follow the positive and negative changes of the magnetic flux in the positive and negative range. Each integrating circuit is equipped with a polypropylene film integrating capacitor with a capacitance of 0.1 microfarads. The capacitor parameters are uniformly set to 0.1 microfarads and matched with a resistance value of A high-impedance bleed resistor of 10MΩ is set and directly connected in parallel across the integrating capacitor. The bleed resistor parameter is fixed at 10MΩ. The purpose of this setting is to release the DC offset charge accumulated in the capacitor and prevent output saturation distortion during long-term integration operations. The input resistor and the integrating capacitor together form the integration time constant. The entire system is designed for 50Hz power frequency magnetic flux signals. The time constant is uniformly matched and set to one millisecond. The parameter value is calculated by multiplying the 10kΩ input resistor and the 0.1µF integrating capacitor to adapt to the power frequency magnetic flux change rate of the distribution network and ensure the linearity of the integration operation.

[0061] (3) Complete the construction of the reference potential calibration circuit for the non-inverting input of the operational amplifier: The series resistance of the non-inverting input of the operational amplifier corresponding to each active integrator circuit is set to a 10 kΩ balancing resistor. The balancing resistor parameter is uniformly set to 10 kΩ, and the resistance value is completely consistent with the front-end input resistance to offset the zero-point drift error caused by the input bias current of the operational amplifier. The end of the balancing resistor is uniformly connected to the simulated ground potential point. At the same time, an adjustable zero-adjustment potentiometer is added to the non-inverting input. The maximum resistance value of the potentiometer is set to 1 kΩ. This parameter is fixed at 1 kΩ. During the factory commissioning stage, the reference voltage is output by fine-tuning the potentiometer to achieve the integration output voltage stabilizing at zero volts when there is no magnetic flux input, thereby eliminating the interference of the inherent offset voltage of the operational amplifier on the magnetic flux restoration accuracy.

[0062] (4) Perform real-time continuous time integration operation on single-channel differential voltage signal: The differential voltage signal delivered by the magnetic flux detection coil represents the rate of change of magnetic flux with time. The signal is sent to the inverting input terminal of the operational amplifier through the 10 kΩ input resistor. The operational amplifier relies on the virtual short and virtual open working characteristics to continuously convert the input differential voltage into charging current to complete the charging and discharging operation of the 0.1 μF integrating capacitor. The hardware circuit synchronously completes the time-domain integral mathematical operation corresponding to Faraday's law of electromagnetic induction. The operation logic is to continuously accumulate and convert the input differential voltage over time. The 10 MΩ discharge resistor slowly releases the DC charge of the capacitor, only filtering out the DC drift component, and does not change the integral waveform corresponding to the power frequency alternating magnetic flux. The integration operation is continuous and uninterrupted throughout the process. When the differential voltage is positive, the integrating capacitor is continuously positively charged, and the output voltage decreases synchronously and linearly. When the differential voltage is negative, the integrating capacitor discharges in the reverse direction, and the output voltage increases synchronously and linearly. When the differential voltage remains at zero volts, the charge of the integrating capacitor remains stable, and the output voltage remains fixed.

[0063] (5) Amplitude buffering and noise secondary filtering of the signal after integration: A voltage follower buffer circuit is added to the integration output of each operational amplifier. The TL082 single-channel operational amplifier is also used. The voltage follower circuit does not change the amplitude of the integrated signal, but only improves the signal load capacity to avoid the load of the back-end line pulling down the output voltage and causing magnetic flux conversion distortion. The output of the buffer circuit is connected in series with a second-order RC low-pass filter branch composed of a 1kΩ resistor and a 0.01µF capacitor. The resistor parameter is set to 1kΩ and the capacitor parameter is set to 0.01µF. It is specifically used to filter out the high-frequency pulse noise generated by the thyristor switching action and only retain the low-frequency analog voltage waveform that is linearly related to the real magnetic flux of the magnetic column. The filtering process will not change the basic voltage amplitude and trend obtained by the integration calculation.

[0064] (6) After integration and secondary filtering, the three analog voltage signals have a fixed proportional relationship between the voltage value and the real-time magnetic flux of the corresponding magnetic column. The signal waveform is a continuous DC analog voltage that changes synchronously with the power frequency magnetic flux. The three signals are transmitted synchronously to the synchronous signal acquisition interface of the harmonic reactive power control module through independent shielded output cables. The length of the three output cables is uniformly controlled within 1.5 meters. The cables are kept away from the power high voltage circuit inside the cabinet. The timing of the three-phase magnetic flux signals is kept synchronized throughout the process, without amplitude attenuation or phase lag.

[0065] The harmonic reactive power mitigation module is used to receive the magnetic flux signal of the iron core, detect grid harmonics based on the built-in SVG topology and adjust reactive power bidirectionally, and raise the system power factor in conjunction with the matching capacitor and reactor device. After completion, it sends a normal operation signal to the fault bypass control module.

[0066] Furthermore, the harmonic reactive power management module is the core unit of the entire active power quality management system. It integrates the SVG active harmonic reactive power management topology with a passive capacitor and reactor compensation device. It receives the three-phase DC flux signal output from the three-dimensional triangular coil core to complete grid synchronization phase locking, monitors the grid-connected current in real time, and separates the active and reactive current components. It generates voltage regulation through two sets of independent proportional-integral regulators, drives the three-phase full-bridge IGBT inverter unit through coordinate inverse transformation and pulse width modulation, and flexibly compensates for capacitive and inductive reactive power in both directions, filtering harmonics from the 3rd to the 25th order across the entire frequency band. At the same time, it automatically switches the matching capacitor and reactor devices according to the magnitude and direction of the grid reactive power to improve the system's basic power factor. After the entire voltage regulation, harmonic filtering, and reactive power compensation process is completed, it periodically sends a standard 24V square wave normal operation pulse signal to the fault bypass control module to realize module-linked fault judgment.

[0067] The harmonic reactive power mitigation module includes an SVG main control unit, an IGBT converter unit, a DC-side capacitor, a grid-connected reactor, and the matching capacitor-reactor device.

[0068] The SVG main control unit has a built-in synchronization signal acquisition interface, which receives the DC flux signals of the three magnetic columns transmitted by the flux signal conditioning circuit. Based on the DC flux signals of the three magnetic columns, a vector synthesis calculation is performed to obtain the three-phase composite flux vector. The phase-locked loop detects the zero-crossing point of the three-phase composite flux vector based on the zero-crossing comparator and generates a synchronization phase angle that is synchronized with the positive sequence component of the grid voltage fundamental wave according to the zero-crossing trigger time. Based on the synchronization phase angle, the grid-connected reactor current signal is subjected to Park transformation, which decomposes the grid-connected reactor current signal into active current component and reactive current component. The active current component is subtracted from the preset active current reference value to obtain the active deviation, and the reactive current component is subtracted from the preset reactive current reference value to obtain the reactive deviation. The Park transformation is prior art in this field and is not an inventive solution of this application, so it will not be described in detail here.

[0069] Furthermore, the calculation process of the three-phase composite magnetic flux vector is as follows: taking the A-phase magnetic flux vector as the 0-degree reference, the B-phase vector lags by 120 degrees, and the C-phase vector lags by 240 degrees. The spatial vector superposition operation is completed by relying on the three-phase magnetic flux amplitude to generate a unique composite magnetic flux vector.

[0070] Furthermore, the zero-crossing point of the synthesized magnetic flux vector is continuously detected, and the phase of the magnetic flux vector at the zero-crossing point is completely synchronized with the positive sequence component of the 50Hz voltage base of the power grid. The trigger time of each zero-crossing point is recorded.

[0071] Furthermore, the active current reference value and reactive current reference value are pre-fixed in the local non-volatile storage area of ​​the SVG main control unit. The two reference values ​​are set based on the following: This energy-saving system only performs dynamic bidirectional compensation for reactive power on the distribution side and does not continuously output or absorb active power to the grid. Under ideal steady-state conditions, the active current and reactive current of the grid-connected branch are close to zero. In this embodiment, the active current reference value is set to 0 Amperes and the reactive current reference value is set to 0 Amperes.

[0072] The SVG main control unit inputs the active power deviation into a first proportional-integral (PI) regulator. The first PI regulator performs proportional coefficient amplification and integral coefficient accumulation calculations on the active power deviation based on a position-based digital PI algorithm, and outputs the active power regulation amount. The SVG main control unit also inputs the reactive power deviation into a second PI regulator. The second PI regulator performs proportional coefficient amplification and integral coefficient accumulation calculations on the reactive power deviation based on a position-based digital PI algorithm, and outputs the reactive power regulation amount. The active power regulation amount and the reactive power regulation amount are then processed by Park inverse transform to generate a three-phase modulated wave signal. This three-phase modulated wave signal is input into a pulse width modulation (PWM) generator. The PWM generator compares the amplitude of the three-phase modulated wave signal with a high-frequency triangular carrier wave using a triangular carrier comparison method, and outputs six-channel switch drive pulses to the IGBT converter unit. The PI regulator and Park inverse transform are existing technologies in this field and are not inventive solutions for this application; therefore, they will not be elaborated upon here.

[0073] The IGBT converter unit comprises six IGBT power devices and six anti-parallel diodes. The six IGBT power devices form a three-phase full-bridge inverter topology. The collectors of the three IGBT power devices in the upper bridge arm are connected in parallel to the positive terminal of the DC-side capacitor, and the emitters of the three IGBT power devices in the lower bridge arm are connected in parallel to the negative terminal of the DC-side capacitor. The gate of each IGBT power device receives a corresponding switching drive pulse output by a pulse width modulation generator. The IGBT converter unit performs high-frequency switching on and off operations based on the six switching drive pulses, inverting the DC voltage across the DC-side capacitor into an AC voltage with a frequency and phase controllable with respect to the grid voltage. This AC voltage is output to the grid through a grid-connected reactor. The grid-connected reactor is a three-phase series reactor group. One end of the grid-connected reactor is connected to the AC output terminal of the IGBT converter unit, and the other end is connected to the load-side bus of the 10kV distribution line.

[0074] Further, six independent drive circuit boards inside the IGBT converter unit individually and continuously identify the level state of the respective connected switch drive pulses. When a high level state is identified, it is determined that the corresponding IGBT power device needs to perform a turn-on action; when a low level state is identified, it is determined that the corresponding IGBT power device needs to perform a turn-off action. The identification operation continues to cycle at a repetition frequency of 10kHz, which is completely consistent with the generation frequency of the triangular carrier inside the pulse width modulation generator. This frequency value is fixedly written during the equipment program initialization phase and is not dynamically adjusted during operation.

[0075] Further, the DC-side capacitor continuously outputs stable DC electric energy, and the rated operating voltage of the DC-side capacitor is set to 18000kV. This voltage value is set to match the power capacity of the SVG device supporting the 10kV distribution line. The alternating turn-on and turn-off process of all IGBT power devices continuously changes the conduction branch through which DC electric energy flows to the inverter AC output end, and the instantaneous polarity of electric energy output is changed by continuously switching the conduction branches. Relying on the timing law of continuous change of the six-way switch drive pulses, the IGBT converter unit converts the constant DC electric energy output by the DC-side capacitor into AC electric energy with a fundamental frequency of 50Hz. The 50Hz frequency value strictly matches the power frequency standard of the domestic public distribution power grid. The phase of the AC electric energy is adjusted in real time following the synchronous phase angle issued by the SVG main control unit. The update frequency of the synchronous phase angle is set to 50Hz, and the phase data is refreshed once every 20ms. The phase adjustment logic is constructed based on the synchronization reference generated by the aforementioned magnetic flux signal, and all parameters related to the synchronization reference are solidified in the local storage area of the SVG main control unit. The three-phase AC output port inside the IGBT converter unit is directly connected to the input end of the grid-connected reactor, and the converted AC voltage signal is completely transmitted into the grid-connected reactor.

[0076] The supporting capacitor-reactor device comprises three sets of power capacitors and series reactors connected in parallel. Each set of power capacitor and series reactor is connected in series and then connected across between the phase line and the neutral line of the 10kV distribution line. The SVG main control unit detects the reactive power flow direction and amplitude on the grid side in real time through the current signal of the grid-connected reactor, and generates a capacitor switching instruction according to the reactive power flow direction and amplitude. The capacitor switching instruction is transmitted to the vacuum contactor drive board of the supporting capacitor-reactor device through the digital output interface of the SVG main control unit, and the vacuum contactor drive board controls the main contact of the vacuum contactor to close or open according to the capacitor switching instruction, so as to realize the connection or disconnection of the power capacitor.

[0077] Furthermore, the process of generating and executing switching commands is as follows: the magnitude and direction of reactive power in the primary power grid are calculated according to a fixed period and compared with preset threshold values ​​to generate binary control commands for switching grouped capacitors; the digital output interface transmits the switching commands to the vacuum contactor drive board, which has built-in opto-isolation devices to isolate low-voltage control signals and the 10kV high-voltage main circuit; the corresponding grouped vacuum contactor coil is energized and attracted, and the main contacts close or open to complete the switching on and off operations of power capacitors and series reactors; the series reactor can suppress the inrush current at the moment the capacitor is closed, avoiding damage to capacitors and thyristor devices by instantaneous large current.

[0078] After completing voltage regulation and harmonic suppression, the harmonic reactive power control module sends a normal operation signal to the fault bypass control module. The normal operation signal is a periodic square wave pulse signal. The high-level duration of the square wave pulse signal is a preset first time length, and the low-level duration of the square wave pulse signal is a preset second time length. The amplitude of the square wave pulse signal is DC 24V, and the pulse period is 1 second. The square wave pulse signal is transmitted to the switch input interface of the fault bypass control module through a shielded twisted pair cable. In this embodiment, both the first time length and the second time length are set to 500ms.

[0079] The fault bypass control module is used to continuously collect equipment operation fault signals of the electromagnetic balance body of the three-dimensional triangular coil iron core, and send the equipment operation fault signals as bypass trigger commands to the bypass switching execution module.

[0080] Furthermore, the fault bypass control module is the core unit for fault safety protection of the entire equipment. It continuously collects four types of fault simulation characteristic signals of the three-dimensional triangular coiled iron core in real time, and comprehensively judges whether there is an operational fault in the equipment by comparing multiple thresholds. Once a fault is determined, it immediately outputs a high-level effective bypass trigger signal to the solid-state relay of the bypass switching execution module, which starts the bypass circuit in milliseconds to isolate the faulty body and ensures that the 10kV power distribution line continuously and uninterruptedly supplies power to the plant load. The module hardware is arranged in an independent control compartment at the bottom of the cabinet, physically separated from the high-voltage power circuit, to avoid damage to the low-voltage control circuit by the high-voltage fault arc.

[0081] The fault bypass control module includes a fault signal acquisition unit and a fault decision unit.

[0082] The fault signal acquisition unit is connected to the output terminals of the temperature sensor, the secondary side output terminal of the winding current transformer, and the fault feedback output terminal of the thyristor switch array via multiple analog input channels. The fault signal acquisition unit selects each analog input channel in a time-division manner based on a multiplexer switch. The fault signal acquisition unit converts the analog signal into digital fault characteristic values ​​based on an analog-to-digital converter. The digital fault characteristic values ​​include digital values ​​of core temperature, winding current, thyristor voltage drop, and drive feedback status of the thyristor switch array.

[0083] After receiving the digital fault characteristic value, the fault judgment unit compares the digital value of the core temperature with the pre-stored upper limit threshold of the core temperature, the digital value of the winding current with the pre-stored upper limit threshold of the winding current, the digital value of the thyristor voltage drop with the pre-stored upper limit threshold of the thyristor voltage drop, and performs a bitwise operation comparison between the digital value of the drive feedback status and the pre-stored normal code of the drive feedback status. If the digital value of the core temperature is greater than the upper limit threshold of the core temperature, or the digital value of the winding current is greater than the upper limit threshold of the winding current, or the digital value of the thyristor voltage drop is greater than the upper limit threshold of the thyristor voltage drop, or the digital value of the drive feedback status does not match the normal code of the drive feedback status, the fault judgment unit determines that there is a fault signal in the equipment operation and uses the determination result as a bypass trigger command. The bypass trigger command is a level trigger signal. When the fault judgment unit determines that there is a fault signal in the equipment operation, the bypass trigger command is a high-level valid signal; when the fault judgment unit determines that there is no fault signal in the equipment operation, the bypass trigger command is a low-level invalid signal. The bypass trigger command is output to the solid-state relay control terminal of the bypass switching execution module through an opto-isolator.

[0084] Furthermore, if the digital value of the core temperature is greater than the upper limit threshold of the core temperature, an overheating fault is determined; if the digital value of the winding current is greater than the upper limit threshold of the winding current, a winding overload and overcurrent fault is determined; if the digital value of the thyristor voltage drop is greater than the upper limit threshold of the thyristor voltage drop, a thyristor device breakdown and open circuit fault is determined; if the digital value of the drive feedback status does not match the normal code of the drive feedback status, a thyristor drive circuit failure fault is determined. After comprehensive judgment, two bypass trigger level signals are output: if any type of fault exists in the equipment, the bypass trigger signal outputs a 24V high-level valid signal; if all four types of operating parameters are within the safe threshold range and the drive code matches the normal standard, the bypass trigger signal outputs a 0V low-level invalid signal. The bypass trigger level signal is transmitted to the solid-state relay control terminal of the bypass switching execution module after being electrically isolated by a high-speed opto-isolator. The opto-isolator isolates the high-voltage circuit fault from reverse intrusion into the low-voltage control circuit. In this embodiment, the upper limit of the core temperature is set to 120°C, which corresponds to the maximum temperature that the amorphous alloy core can withstand for long-term safe operation. Exceeding the temperature will permanently damage the magnetic properties of the core. The upper limit of the continuous winding current is set to 250 amperes to match the rated long-term current carrying capacity of the high and low voltage windings of the equipment. Exceeding the current limit will cause the winding insulation to overheat and burn out. The upper limit of the thyristor conduction voltage drop is set to 8kV to match the normal conduction voltage drop range of the high voltage thyristor. Exceeding the value indicates that the device has a breakdown open circuit fault. The normal state code of the thyristor drive is set to the hexadecimal number 5A.

[0085] The bypass switching execution module connects the incoming line monitoring and control module with the electromagnetic balance body of the three-dimensional triangular coiled iron core. After receiving the bypass trigger command, it switches the bypass circuit to isolate the electromagnetic balance body of the three-dimensional triangular coiled iron core in the fault state. The power grid continues to supply power through the bypass, and at the same time, the bypass status is transmitted back to the incoming line monitoring and control module.

[0086] Furthermore, the bypass switching execution module is responsible for uninterrupted power supply switching in the event of equipment failure. The incoming and outgoing three-phase vacuum circuit breakers are connected in series in the main power supply circuit of the three-dimensional voltage regulation body, and the bypass three-phase vacuum contactor is connected in parallel across the two ends of the incoming and outgoing circuit breakers. The electrical interlocking circuit strictly limits the main circuit and bypass circuit from closing at the same time to avoid 10kV high-voltage phase-to-phase short circuit. After receiving the bypass high-level trigger signal, the bypass contactor is quickly closed to isolate the faulty voltage regulation body. The power grid relies on the bypass to directly supply power to the plant load continuously. At the same time, the bypass start status is fed back to the incoming line measurement and control module, the voltage regulation program is frozen, and fault alarm information is pushed remotely.

[0087] Furthermore, the bypass switching execution module includes an incoming-side three-phase vacuum circuit breaker, an outgoing-side three-phase vacuum circuit breaker, a bypass three-phase vacuum contactor, and an interlocking control circuit. The main circuit input terminal of the incoming-side three-phase vacuum circuit breaker is connected to the incoming terminal of the 10kV distribution line, and the main circuit output terminal is connected to the high-voltage winding input terminal of the three-dimensional delta-core electromagnetic balance body. The main circuit input terminal of the outgoing-side three-phase vacuum circuit breaker is connected to the low-voltage winding output terminal of the three-dimensional delta-core electromagnetic balance body, and the main circuit output terminal is connected to the load-side outgoing terminal of the 10kV distribution line. The main circuit input terminal of the bypass three-phase vacuum contactor is connected to the main circuit input terminal of the incoming-side three-phase vacuum circuit breaker, and the main circuit output terminal is connected to the main circuit output terminal of the outgoing-side three-phase vacuum circuit breaker. The interlocking control circuit includes a first relay coil, a second relay coil, a normally closed contact of the first relay, a normally closed contact of the second relay, and a time-delayed disconnect relay. The first relay coil is connected in series in the closing control circuit of the incoming three-phase vacuum circuit breaker, and the normally closed contact of the first relay is connected in series in the closing control circuit of the bypass three-phase vacuum contactor. After the incoming three-phase vacuum circuit breaker is energized, the first relay coil is energized and closed, the normally closed contact of the first relay opens, and the closing circuit of the bypass three-phase vacuum contactor is directly cut off, preventing the bypass circuit from closing and conducting. The second relay coil is connected in series in the closing control circuit of the bypass three-phase vacuum contactor, and the normally closed contact of the second relay is connected in series in the closing control circuit of the incoming three-phase vacuum circuit breaker. After the bypass three-phase vacuum contactor is closed and energized, the coil of the second relay is energized and the normally closed contact of the second relay opens, cutting off the closing circuit of the incoming three-phase vacuum circuit breaker and preventing the main power supply circuit from closing and conducting. The delayed-opening relay is connected in series in the closing control circuit of the outgoing three-phase vacuum circuit breaker. After receiving the bypass trigger signal, it outputs the tripping control signal after a fixed delay, waiting for the bypass three-phase vacuum contactor to fully close and the circuit current to switch smoothly before disconnecting the outgoing three-phase vacuum circuit breaker, thus preventing brief power outages during switching. The interlocking control circuit is based on the normally closed contacts of the first and second relays to construct an electrical interlock, ensuring that the incoming three-phase vacuum circuit breaker and the bypass three-phase vacuum contactor do not close simultaneously.

[0088] After receiving a 24V high-level bypass trigger command from the fault bypass control module, the solid-state relay control terminal of the bypass switching execution module activates the internal opto-isolation path of the solid-state relay, closing the output contact in series with the bypass contactor closing circuit. This energizes the AC 220V closing coil. The output contact of the solid-state relay is connected in series with the closing control circuit of the bypass three-phase vacuum contactor. When the output contact of the solid-state relay closes, the closing coil of the bypass three-phase vacuum contactor built into the bypass switching execution module is energized, and the main contact of the bypass three-phase vacuum contactor closes. The entire closing process takes a very short time, and the power grid continues to supply power through the main circuit of the bypass three-phase vacuum contactor, ensuring uninterrupted power supply to the plant load without any power outage gaps. Simultaneously, the auxiliary normally open contact of the bypass three-phase vacuum contactor closes. One end of the auxiliary normally open contact is connected to the positive terminal of the DC power supply, and the other end is connected to the bypass status feedback signal line, which is connected to the digital input port of the incoming line measurement and control module.

[0089] Furthermore, the bypass status feedback signal line transmits a high-level bypass status signal to the digital input port of the incoming line measurement and control module. After the built-in control unit of the incoming line measurement and control module detects that the digital input port is high, the status register inside the built-in control unit writes the bypass activation status code value. The built-in control unit immediately freezes the voltage regulation command generation process according to the bypass activation status code value, and at the same time, the built-in control unit uploads the bypass activation status code value to the distribution automation master station system through the built-in remote communication interface.

[0090] Furthermore, the built-in control unit collects the surface temperature value of the iron core frame based on the temperature sensor and uses the surface temperature value as the digital value of the iron core temperature. At the same time, it also collects the effective current values ​​of the high-voltage winding and the low-voltage winding based on the winding current transformer and uses the maximum value of the effective current values ​​of the high-voltage winding and the low-voltage winding as the digital value of the winding current. It also reads the on / off state of each anti-parallel thyristor pair based on the drive feedback state of the thyristor switch array to obtain the digital value of the drive feedback state. The digital values ​​of the iron core temperature, winding current, thyristor voltage drop, and drive feedback state are periodically written into the shared data register of the fault bypass control module through the internal bus.

[0091] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments under the guidance of the present invention without departing from the spirit and scope of the present invention. All of these variations are within the protection scope of the present invention.

Claims

1. A three-dimensional triangular wound iron core electromagnetic balance voltage regulation harmonic suppression energy-saving system, applied to 10kV power distribution energy-saving equipment, characterized in that, The 10kV power distribution energy-saving management equipment includes a three-dimensional triangular rolled iron core electromagnetic balance body. The three-dimensional triangular rolled iron core electromagnetic balance body is composed of three sets of iron core single frames of the same specification spliced ​​into a three-phase symmetrical three-dimensional structure. The equipment is equipped with an incoming line measurement and control module, a harmonic reactive power management module, a fault bypass control module, and a bypass switching execution module. The incoming line measurement and control module is used to connect to the 10kV power distribution line, collect operating condition data and send it to the built-in control unit to generate voltage regulation command, and then output the voltage regulation command to the three-dimensional triangular coiled iron core electromagnetic balance body to drive the three-dimensional triangular coiled iron core electromagnetic balance body to perform voltage stabilization action and synchronously output the iron core magnetic flux signal. The harmonic reactive power mitigation module is used to receive the magnetic flux signal of the iron core, detect grid harmonics based on the built-in SVG topology and adjust reactive power bidirectionally, and raise the system power factor in conjunction with the matching capacitor and reactor device. After completion, it sends a normal operation signal to the fault bypass control module. The fault bypass control module is used to continuously collect equipment operation fault signals of the electromagnetic balance body of the three-dimensional triangular coil iron core, and send the equipment operation fault signals as bypass trigger commands to the bypass switching execution module. The bypass switching execution module connects the incoming line monitoring and control module with the electromagnetic balance body of the three-dimensional triangular coiled iron core. After receiving the bypass trigger command, it switches the bypass circuit to isolate the electromagnetic balance body of the three-dimensional triangular coiled iron core in the fault state. The power grid continues to supply power through the bypass, and at the same time, the bypass status is transmitted back to the incoming line monitoring and control module.

2. The three-dimensional triangular wound iron core electromagnetic balance voltage regulation harmonic suppression energy-saving system as described in claim 1, characterized in that, The incoming line measurement and control module includes a voltage transformer, a current transformer, a signal conditioning circuit, an analog-to-digital conversion circuit, and a built-in control unit. The primary side of the voltage transformer is connected to phase A, phase B, phase C and neutral line of the 10kV distribution line, and the secondary side of the voltage transformer outputs a low-voltage analog voltage signal that reflects the phase voltage and line voltage of the line. The primary side of the current transformer is respectively connected to the A-phase, B-phase, and C-phase outgoing terminals of the 10kV distribution line, and the secondary side of the current transformer outputs a low-voltage analog current signal that reflects the line load current. The signal conditioning circuit receives low-voltage analog voltage signals and low-voltage analog current signals, filters and amplifies them, and outputs conditioned analog voltage signals and conditioned analog current signals. The analog-to-digital conversion circuit is based on a successive approximation analog-to-digital converter to synchronously sample the conditioned analog voltage signal and the conditioned analog current signal, and output digital voltage signal and digital current signal. The built-in control unit performs spectral analysis on digital voltage and digital current signals based on the Fast Fourier Transform algorithm. Based on the spectral analysis results, it extracts the fundamental voltage RMS value, fundamental current RMS value, and fundamental phase difference between voltage and current. It then generates a voltage regulation command based on the deviation between the fundamental voltage RMS value and the preset rated voltage reference value. Finally, the voltage regulation command is output to the thyristor switch array driver board of the three-dimensional triangular coiled iron core electromagnetic balance body through the optical fiber communication interface.

3. The three-dimensional triangular wound iron core electromagnetic balance voltage regulation harmonic suppression energy-saving system as described in claim 2, characterized in that, The built-in control unit marks the fundamental voltage RMS value as... The preset rated voltage reference value is marked as The built-in control unit calculates the voltage deviation percentage. The built-in control unit has a pre-stored adjustment step size mapping table. Each row of the adjustment step size mapping table contains a voltage deviation percentage range and a corresponding adjustment step size value. The built-in control unit uses... Using the query key, the voltage deviation percentage range in the adjustment step size mapping table is traversed using a linear lookup table method. When the voltage deviation falls within any voltage deviation percentage range, the built-in control unit extracts the adjustment step size value corresponding to the voltage deviation percentage range as the current adjustment step size; simultaneously, it... Perform sign discrimination, if If the value is positive, a voltage regulation command containing the voltage increase direction indicator and the current adjustment step size is generated. If the value is negative, a voltage regulation command containing the voltage reduction direction indicator and the current adjustment step size will be generated. If the value is zero, a voltage regulation command is generated that includes maintaining the direction indicator and setting the step size to zero.

4. The three-dimensional triangular wound iron core electromagnetic balance voltage regulation harmonic suppression energy-saving system as described in claim 1, characterized in that, The three-dimensional triangular coiled iron core electromagnetic balance body includes three sets of iron core single frames of the same specification, high voltage winding, low voltage winding, and thyristor switch array. Each set of iron core frames is formed by winding amorphous alloy strip. The cross-sectional shape of the iron core frame is rectangular. The three sets of iron core frames are spliced ​​together in a spatially symmetrical manner with an included angle of 120 degrees between each pair to form a closed magnetic circuit. The closed magnetic circuit has three magnetic pillars and three magnetic yokes. Both the high-voltage winding and the low-voltage winding adopt a layered and segmented winding structure and are respectively sleeved on three magnetic pillars. The tap end of each phase of the high-voltage winding is connected to the corresponding input end of the thyristor switch array, and the output end of each phase of the low-voltage winding serves as the voltage regulation output end of the electromagnetic balance body of the three-dimensional triangular wound iron core. The thyristor switch array is a three-phase independent controllable structure. Each phase of the thyristor switch array contains multiple anti-parallel thyristor pairs. Each anti-parallel thyristor pair corresponds to a winding tap position. After receiving the voltage regulation command transmitted by the optical fiber communication interface, the drive board of the thyristor switch array performs tap decoding and switching operations according to the direction indicator and step value in the voltage regulation command.

5. The three-dimensional triangular wound iron core electromagnetic balance voltage regulation harmonic suppression energy-saving system as described in claim 4, characterized in that, The step-level decoding and switching operation based on the direction identifier and step size value in the voltage regulation command includes: the driver board first parses the adjustment step size value from the voltage regulation command; the driver board converts the adjustment step size value into a parallel output binary code based on a binary encoder decoder; then it parses the adjustment direction identifier from the voltage regulation command and determines the step direction based on the adjustment direction identifier; the driver board reads the current gear address code corresponding to the anti-parallel thyristor pair currently in the conducting state, and modifies the current gear address code with the step direction. The target gear address code is obtained by performing addition or subtraction operations on the step binary code; the target gear address code is latched and output to the gate drive gating array of each anti-parallel thyristor pair; the gating branch in the gate drive gating array that matches the target gear address code outputs a turn-on drive pulse to the gate of the corresponding anti-parallel thyristor pair; all gating branches in the gate drive gating array that do not match the target gear address code stop outputting drive pulses, so that the anti-parallel thyristor pair of the currently closed gear is turned off and the anti-parallel thyristor pair of the target gear is turned on.

6. The three-dimensional triangular wound iron core electromagnetic balance voltage regulation harmonic suppression energy-saving system as described in claim 5, characterized in that, The three-dimensional triangular coiled iron core electromagnetic balance body also includes an iron core magnetic flux detection coil, which is wound at a preset height position on three magnetic pillars respectively. The secondary side of the iron core magnetic flux detection coil outputs a differential voltage signal that reflects the real-time magnetic flux change rate of each magnetic pillar. The electromagnetic balance body of the three-dimensional triangular coiled iron core also includes a magnetic flux signal conditioning circuit. The magnetic flux signal conditioning circuit receives the differential voltage signals of the three magnetic pillars, performs time integration operation on the differential voltage signals based on the active integrator circuit constructed by the integrated operational amplifier, and outputs a DC magnetic flux signal that is proportional to the real-time magnetic flux of each magnetic pillar.

7. The three-dimensional triangular wound iron core electromagnetic balance voltage regulation harmonic suppression energy-saving system as described in claim 1, characterized in that, The harmonic reactive power mitigation module includes an SVG main control unit, a grid-connected reactor, and the matching capacitor-reactor device. The SVG main control unit has a built-in synchronization signal acquisition interface. The synchronization signal acquisition interface receives the DC flux signals of the three magnetic columns transmitted by the flux signal conditioning circuit. Based on the DC flux signals of the three magnetic columns, vector synthesis calculation is performed to obtain the three-phase composite flux vector. The phase-locked loop detects the zero-crossing point of the three-phase composite flux vector based on the zero-crossing comparator and generates a synchronization phase angle that is synchronized with the positive sequence component of the grid voltage fundamental wave according to the zero-crossing trigger time. Based on the synchronization phase angle, Park transformation is performed on the grid-connected reactor current signal to decompose the grid-connected reactor current signal into active current component and reactive current component. The active current component is subtracted from the preset active current reference value to obtain the active deviation, and the reactive current component is subtracted from the preset reactive current reference value to obtain the reactive deviation.

8. The three-dimensional triangular wound iron core electromagnetic balance voltage regulation harmonic suppression energy-saving system as described in claim 1, characterized in that, After completing voltage regulation and harmonic suppression, the harmonic reactive power control module sends a normal operation signal to the fault bypass control module. The normal operation signal is a periodic square wave pulse signal. The high-level duration of the square wave pulse signal is a preset first time length, and the low-level duration of the square wave pulse signal is a preset second time length. The amplitude of the square wave pulse signal is DC 24V. The square wave pulse signal is transmitted to the switch input interface of the fault bypass control module through a shielded twisted pair cable.

9. The three-dimensional triangular wound iron core electromagnetic balance voltage regulation harmonic suppression energy-saving system as described in claim 1, characterized in that, The fault bypass control module includes a fault signal acquisition unit and a fault decision unit. The fault signal acquisition unit outputs digital fault characteristic values ​​based on the analog-to-digital converter; the digital fault characteristic values ​​include digital values ​​of core temperature, winding current, thyristor voltage drop, and drive feedback status of the thyristor switch array. After receiving the digital fault feature value, the fault judgment unit compares the digital value of the core temperature with the pre-stored upper limit threshold of the core temperature, compares the digital value of the winding current with the pre-stored upper limit threshold of the winding current, compares the digital value of the thyristor voltage drop with the pre-stored upper limit threshold of the thyristor voltage drop, and performs bitwise operations to compare the digital value of the drive feedback status with the pre-stored normal code of the drive feedback status. If the digital value of the core temperature is greater than the upper limit threshold of the core temperature, or the digital value of the winding current is greater than the upper limit threshold of the winding current, or the digital value of the thyristor voltage drop is greater than the upper limit threshold of the thyristor voltage drop, or the digital value of the drive feedback status does not match the normal code of the drive feedback status, then the fault judgment unit determines that there is a fault signal in the equipment operation and uses the judgment result as a bypass trigger command. The bypass trigger command is a level trigger signal. When the fault judgment unit determines that there is a fault signal in the equipment operation, the bypass trigger command is a high-level valid signal. When the fault judgment unit determines that there is no fault signal in the equipment operation, the bypass trigger command is a low-level invalid signal. The bypass trigger command is output to the solid-state relay control terminal of the bypass switching execution module through an opto-isolator.

10. The three-dimensional triangular wound iron core electromagnetic balance voltage regulation harmonic suppression energy-saving system as described in claim 1, characterized in that, After receiving the bypass trigger command, the solid-state relay control terminal of the bypass switching execution module closes the output contact of the solid-state relay. The output contact of the solid-state relay is connected in series in the closing control circuit of the bypass three-phase vacuum contactor. When the output contact of the solid-state relay closes, the closing coil of the bypass three-phase vacuum contactor built into the bypass switching execution module is energized, the main contact of the bypass three-phase vacuum contactor closes, and the power grid continues to supply power through the main circuit of the bypass three-phase vacuum contactor. At the same time, the auxiliary normally open contact of the bypass three-phase vacuum contactor closes. One end of the auxiliary normally open contact is connected to the positive terminal of the DC power supply, and the other end of the auxiliary normally open contact is connected to the bypass status feedback signal line. The bypass status feedback signal line is connected to the digital input port of the incoming line measurement and control module.

Images