1190 results about "Thyristor" patented technology

The invention relates to the technical field of power systems, and discloses a voltage regulation system of reactive power compensation equipment, which is characterized in that harmonic interference is filtered and eliminated through a voltage reactive power sensing unit, and accurate power grid parameters are acquired; a load trend pre-judgment unit analyzes the historical load curve and the real-time change trend to generate a future pre-judgment signal; the dynamic compensation calculation unit combines the current power grid state with the prediction to calculate the optimal compensation capacity and generate a switching instruction, after the hybrid switching actuator receives the instruction, a thyristor is triggered firstly to realize inrush current-free conduction, a contactor is switched to maintain low power consumption after the current is stable, and meanwhile, the compensation state monitoring unit performs closed-loop adjustment on parameter deviation, so that the optimal compensation capacity is obtained. The multi-dimensional protection unit prevents overvoltage, overcurrent and overheating, the double-path power supply guarantees continuous operation when the main power supply is abnormal, the intelligent communication unit realizes data uploading and remote cooperation, quick response switching of reactive compensation equipment and guarantee of safety of a large-scale power grid are realized, and inrush current impact in the switching process is effectively inhibited.

The invention provides a metallurgical chemical solid waste pretreatment vertical electric heating roasting furnace device and a using method thereof.The furnace body is of a hollow cylindrical vertical structure, a barrel is divided into a solid reduction area, an oxidation reduction area and a furnace charge preheating area, the barrel of the solid reduction area and the barrel of the oxidation reduction area are surrounded by flat rectangular red copper pipes, and an auxiliary induction bar is arranged in the center of the barrel; and the feeding and discharging device is connected to the PLC automatic control module. The power supply control and heat supply device is connected with the red copper pipe through a silicon controlled rectifier medium-frequency power supply, and an air supply and exhaust device, a temperature control device and a sealing device are additionally arranged. Fossil fuel is replaced by electric heating, carbon emission is reduced, environmental protection is achieved, temperature control is accurate, heat efficiency is high, and energy consumption and cost can be saved. One set of equipment is suitable for different solid waste raw materials, pretreated products are obtained through different roasting methods, the equipment is simple, investment is saved, the technological process is short, applicability is high, heating is even through the structural design, sealing is good, continuous production can be achieved, and heat efficiency and production efficiency are improved.

The invention provides a current source type hybrid direct-current power transmission system based on an injection type power grid commutation converter, and relates to the field of high-voltage direct-current power transmission, and the system comprises a rectification station which at least comprises a thyristor-based power grid commutation converter and is used for converting alternating current into direct current; the inverter station at least comprises an injection type power grid commutation converter and is used for converting the direct current output by the rectifier station into alternating current; and the control module is used for controlling the operation of the rectifier station and the inverter station based on the trigger time sequence constraint, and has the advantages of completely inhibiting the commutation failure and reducing the loss.

The invention provides a simulation method and system with controllable split-phase voltage drop time difference, and relates to the technical field of electric power testing, and the method comprises the steps: adjusting voltage through a three-phase voltage regulator, employing a bidirectional silicon controlled rectifier and IGBT hybrid switch structure to achieve voltage drop, collecting and processing a three-phase voltage signal through a digital signal processor, and extracting zero crossing point information; and a control pulse signal with phase compensation is generated, the conduction time sequence of the switch element is controlled to realize soft switching, and the industrial computer receives and processes the signal and displays a voltage drop waveform. The split-phase voltage drop time difference can be accurately controlled, and the simulation precision and the system reliability are improved.

The invention discloses a converter valve multistage thyristor level closed-loop test device which comprises a CPU control module, a photoelectric conversion module, an analog quantity acquisition module, a switching value module, an output control unit, an impedance test unit, an overvoltage and overcurrent protection module, a safety protection module, a man-machine interaction unit module and a power supply module. The CPU control module is respectively connected with the photoelectric conversion module, the analog quantity acquisition module, the switching value module, the output control unit, the impedance test unit, the overvoltage and overcurrent protection module, the safety protection module and the man-machine interaction unit module; the power supply module is connected with the CPU control module, the safety protection module, the photoelectric conversion module, the analog quantity acquisition module, the overvoltage and overcurrent protection module, the switching value module, the output control unit, the impedance test unit and the man-machine interaction unit module. According to the invention, the automation degree and the field adaptability of the test are improved, and the field maintenance efficiency and the visual analysis capability of the operation state of the thyristor are improved.

The invention belongs to the technical field of power transformation equipment, and particularly relates to a low-voltage dynamic reactive compensation switching device which comprises a shell, a photoelectric isolation module and a communication module. The shell is in an inverted-T shape, a switching switch is arranged at the front end of the shell, wiring ports are symmetrically formed in the upper side and the lower side of the shell, and wiring bolts are installed on the wiring ports. A photoelectric isolation module is arranged on one side of the shell, and the heat dissipation holes dissipate heat for the photoelectric isolation module. According to the scheme, a thyristor and contactor hybrid switching switch is adopted, zero-crossing switching is realized by the thyristor during dynamic load fluctuation, and inrush current control is less than or equal to 10 times of rated current. And when the static state is stable, the contactor is automatically switched to be conducted, and the power consumption is reduced to 1.5 W and is greatly reduced compared with a pure thyristor scheme, so that the impact is avoided and the energy consumption is reduced. The thyristors are in bidirectional anti-parallel connection, and are matched with zero-cross detection logic of the controller, so that overvoltage and transient harmonic waves in the switching process are thoroughly eliminated, no interference is caused to a power grid, and the service life of the device and power grid equipment is prolonged.

The invention provides a multi-path vibration energy collection device, and the device comprises a mass block which can generate relative movement under the excitation effect; the piezoelectric cantilever beams are arranged on the two transverse sides of the mass block and used for responding to high-frequency micro-amplitude vibration energy; the permanent magnet assembly is fixed in the moving direction of the mass block and is matched with the induction coil to realize magnetoelectric energy conversion; the piezoelectric cantilever beam is connected with the bridge rectifier and the thyristor threshold trigger circuit 1, and the permanent magnet assembly is connected with the bridge rectifier and the thyristor threshold trigger circuit 2 to form a double-independent energy collection channel. The method has the following advantages: (1) a path orthogonal decoupling design is adopted, so that a structure and energy dual-independent acquisition path is realized; (2) the energy conversion efficiency is improved based on a coupling response mechanism of mass block inertia driving; and (3) a thyristor threshold triggering mechanism realizes micro-energy efficient conversion, and the output is stable and reliable.

The invention discloses a high-voltage bidirectional silicon controlled rectifier electrostatic protection device and a manufacturing method. The high-voltage bidirectional silicon controlled rectifier electrostatic protection device comprises a P-type substrate, a P-type well and a high-voltage N well, the emitter P + injection of a parasitic PNP triode and the emitter N + injection of a parasitic NPN triode in the P-type well are arranged alternately, so that the length of a transverse discharge path of the silicon controlled rectifier is reduced to the greatest extent, the square resistance of a PNPN positive feedback conduction path is greatly reduced, and the key problem that a symmetrical bidirectional silicon controlled rectifier structure cannot be effectively opened in a high-voltage window of more than 70V is solved; in addition, the layout can provide an additional parasitic NPN triode path for a silicon controlled rectifier path, the effective area of an emitter of the parasitic NPN triode and the proportion of the emitter in a silicon controlled rectifier loop are increased, and the current discharge capacity of the device is further improved. Therefore, reference can be provided for the structural design of the high-voltage symmetrical bidirectional silicon controlled rectifier electrostatic protection device, and the silicon controlled rectifier can be effectively applied to ESD protection of a high-voltage bidirectional port.

The invention discloses a low-voltage line intelligent voltage regulation voltage stabilizer control system, and relates to the technical field of voltage stabilizer control, an intelligent control unit judges whether the current line voltage needs voltage regulation control based on a control algorithm, if yes, a corresponding voltage regulation control instruction is generated, a silicon controlled rectifier switching module executes non-contact on and off operation, and the voltage regulation control is completed. The voltage regulation compensation module is used for carrying out voltage compensation on the basis of the output of the voltage transformation module, so that the output voltage is controlled within a preset range, and when the power grid voltage is detected to be recovered and stable within a set time, and when the power grid voltage is detected to be abnormal, the voltage regulation compensation module is used for carrying out voltage compensation on the basis of the output of the voltage transformation module. And the intelligent control unit is automatically switched into a bypass for operation. According to the control system, a voltage stabilization control framework with high response speed, three-phase independent adjustment capability, an intelligent dormancy mechanism and a complete fault protection system is constructed, and the intelligent level and the operation performance of the low-voltage power distribution system are remarkably improved.

The invention provides a health state depth feature extraction method for key components of an extra-high voltage direct current transmission converter valve, and belongs to the technical field of extra-high voltage transmission equipment.The health state depth feature extraction method comprises the steps that firstly, different fault state models are constructed through PSCAD simulation, data are collected, and dimension reduction processing is conducted on multi-source heterogeneous data through principal component analysis; and establishing a time sequence sliding window mechanism to calculate data characteristic parameters. And then temperature features are extracted based on a thyristor junction thermal diffusion mechanism equation, deep feature extraction is performed by using a multi-head self-attention enhanced bidirectional long-short-term memory network, multi-source data such as infrared temperature measurement and ultraviolet discharge are fused, and abnormal feature representation is calculated through an isolated point feature evaluation function. And finally, constructing a feature vector space containing electrical features, temperature features, isolated point features and multi-component correlation features, outputting complete health state feature representation, and providing a basis for state evaluation and fault prediction of the converter valve.

The invention discloses a fault detection method and system for an SVF multi-stage full-bridge sub-module in an SLCC, and the method comprises the steps: constructing a converter valve test model which comprises a converter valve, a valve control unit and a low-pressure pressurization unit; wherein the converter valve comprises a full-bridge sub-module; based on a valve tower structure, wiring complexity and test voltage safety, performing number optimization on series connection and parallel connection of full-bridge sub-modules, and setting test power supply voltage; and based on the topological structure of the full-bridge sub-modules, performing low-voltage pressurization test on the full-bridge sub-modules by using a low-voltage pressurization unit to obtain the working states of the full-bridge sub-modules, judging faults of the full-bridge sub-modules connected in series, and positioning fault positions. According to the method, the detection efficiency of the multi-stage full-bridge sub-module is improved, all the full-bridge sub-modules of the valve tower can be rapidly and accurately detected and diagnosed only through one-time wiring, the field handover test time is shortened, and SLCC direct-current power transmission project construction is supported.

The invention relates to the technical field of welding, and provides a low-load voltage circuit and a lithium battery welding machine. The circuit comprises a main control module, a voltage detection unit, a switching circuit, a pulse modulation unit and a current sampling feedback unit. The voltage detection unit monitors the end voltage of a welding gun of a welding machine in real time, the switching circuit limits the output voltage to be smaller than a safety threshold value of 36 V in a no-load mode, and a built-in bidirectional thyristor achieves isolation of a high-voltage loop and a low-voltage loop. The pulse modulation unit adjusts the on-off frequency of a main power loop, and the current sampling feedback unit dynamically adjusts the pulse duty ratio so as to accurately control the welding current. The lithium battery welding machine integrates the circuit and is provided with a welding gun assembly, a main transformer and a power supply module, the electric shock risk is effectively reduced, and the welding quality and efficiency are improved.

The invention discloses a power supply system and method for substation equipment, and relates to the technical field of substation power supply, and the system comprises a data collection module which is used for synchronously collecting three-phase voltage and current signals of a substation load; the harmonic characteristic analysis module is used for carrying out harmonic analysis on the collected signals and calculating the amplitude and phase dispersion of each harmonic; the dynamic weight calculation module is used for calculating a dynamic harmonic weight factor according to the harmonic analysis result; the equivalent reactive power decision module is used for calculating equivalent reactive power and generating an optimal capacitor switching instruction in combination with harmonic weight and temperature compensation; the temperature compensation module is used for monitoring the temperature of the capacitor in real time and calibrating the actual capacity of the capacitor; and the flexible switching execution module is used for triggering a thyristor near the voltage zero crossing point. By constructing the harmonic phase dispersion analysis mechanism and the harmonic weight factor dynamic correction model, the transient characteristic and steady-state distortion difference of the load harmonic can be analyzed more accurately.

The invention belongs to the technical field of power systems, and particularly discloses a fault prediction method for a thyristor and a BOD (Biochemical Oxygen Demand) in an SVC (Static Var Compensator), which comprises the following steps: an optimized data acquisition stage: continuously acquiring and storing data by utilizing a long short-term memory network, and dividing fault types into thyristor open circuit, thyristor short circuit, trigger angle deviation and normal state; establishing a prediction model: analyzing historical operation data by using a time sequence method, generating the prediction model by using a convolutional neural network and a long-short-term memory method, predicting the operation trend of the equipment in real time, and generating an early warning notice; a BOD protection circuit is optimized, wherein a BOD overvoltage detection branch and low-pass filtering branches R1 and C1 are established on a thyristor main circuit.

An on-line program control excitation power supply with quench protection for a high-temperature superconducting magnet comprises a single-chip microcomputer for receiving control data, outputting control voltage through digital-to-analog conversion (DAC) of the single-chip microcomputer, and magnetizing a magnet coil through current stepping; a sampling signal is output to the liquid crystal screen to display corresponding voltage and current values in real time after being processed by the single-chip microcomputer analog-to-digital conversion ADC; voltage signals at the two ends of the magnet coil are sampled and returned to the single-chip microcomputer to be processed, when high voltage occurs, it is judged that the voltage signals are abnormal voltage signals, quench protection is carried out, the single-chip microcomputer outputs control signals to cut off connection between the magnet coil and the excitation power source, and residual energy of the magnet coil is released through the high-power thyristor. The provided excitation power supply has the characteristics of high power, high stability, good repeatability and good linearity; performing numerical control stepping output, gradually applying current to the superconducting coil, and slowly establishing a magnetic field; effective quench protection is achieved, and it is guaranteed that a magnet coil is not damaged by quench.

The invention provides a low-trigger and high-maintenance silicon controlled rectifier and a manufacturing method thereof. A first N + injection region and a first P + injection region are arranged in a first N well, a third N + injection region and a second P + injection region are arranged in a first P well, and the second N + injection region is arranged between the first N well and the first P well; three electrodes corresponding to the first N + injection region, the first P + injection region and the second N + injection region are connected together to form a silicon controlled rectifier anode, and two electrodes corresponding to the third N + injection region and the second P + injection region are connected together to form a silicon controlled rectifier cathode; the first grid electrode is arranged on the surface of the first P well and connected with the cathode of the silicon controlled rectifier through an external resistor. And the external resistor, the second N + injection region and the side capacitor of the grid form an RC path, so that the effects of reducing the trigger voltage and improving the maintaining voltage are achieved.

The invention relates to the technical field of output sharing control, in particular to a multi-path power regulator control method and system, and the method comprises the following steps: collecting real-time data to establish a data queue, calculating a mean value and a standard deviation to generate a dynamic operation baseline, collecting the real-time data to establish the queue, calculating the mean value and the standard deviation to generate a dynamic baseline, the method comprises the following steps: calculating an adaptive over-current and open-phase alarm threshold based on a baseline, adding an external control quantity to obtain a total power demand, adjusting the number of cycles according to the stability of a load, reducing the number of active whole waves in proportion when the number exceeds the limit, and stopping a thyristor triggering instruction when the current or voltage abnormally and continuously reaches a preset count. According to the method, the self-adaptive threshold is calculated by establishing the dynamic operation base line in combination with the fluctuation amplitude and the sensitivity factor, current and voltage abnormity is specifically recognized, the total cycle number and the active whole wave number are adjusted in combination with the external power requirement and the load stability, single trigger angle control dependence is avoided, and power distribution balance and electric energy supply stability are achieved; and the equipment damage risk is reduced.

A circuit device includes: a first terminal; a second terminal; a first thyristor circuit whose one end is coupled to the first terminal; a second thyristor circuit whose one end is coupled to the second terminal; and a voltage setting circuit that is shared by the first thyristor circuit and the second thyristor circuit and through which a current from the first thyristor circuit when the first thyristor circuit is turned on and a current from the second thyristor circuit when the second thyristor circuit is turned on flow. The voltage setting circuit sets a voltage at other end of the first thyristor circuit to a first voltage when the first thyristor circuit is turned on, and sets a voltage at other end of the second thyristor circuit to a second voltage when the second thyristor circuit is turned on.

The invention belongs to the technical field of ultra-high voltage direct current power transmission, and discloses a test system and method of a converter valve thyristor voltage detection board card, and the test system comprises a test cabinet and a test tool. An industrial control system is integrated in the test cabinet to set test parameters and criteria, an electric control unit loads an excitation source, an acquisition display unit acquires test data and presents the test data in an oscillogram, and a test tool fixes a tested board card. The industrial control system outputs a control instruction to drive the electric control unit to apply system test excitation, the actual working condition of the thyristor is simulated, and meanwhile, the acquisition and display unit automatically captures multichannel signal data; data are transmitted to the industrial control system through the electric control unit, and the board card performance is automatically analyzed and a test report is generated in combination with a preset criterion. By adopting the system, the problems of insufficient function verification, low test efficiency, vulnerable equipment, poor data accuracy and large manpower occupation are solved, efficient and lossless automatic test is realized, the test reliability is improved, and the operation process is simplified.

The invention provides a harmonic detection method and system for a transformer, and belongs to the technical field of harmonic detection, and the method specifically comprises the steps: determining the abnormal change conditions of temperature monitoring data of temperature monitoring devices in different converter bridges based on the temperature monitoring data, determining an abnormal monitoring device in the temperature monitoring devices according to the abnormal change conditions, and determining the abnormal monitoring device according to the abnormal change conditions; according to distribution data of abnormal monitoring devices in different converter bridges and change conditions of operation voltages of thyristors in different converter bridges in different operation current intervals, the monitoring reliability of the converter is determined to meet requirements. The harmonic detection method of the transformer in different operation current intervals is determined according to the deviation condition of the temperature monitoring data between the thyristors in different operation current intervals in different converter bridges, so that the accuracy of harmonic detection processing is improved.

A dual power switching system selects a first power source or a second power source to supply power to a load coupled to an inductive device. The dual power switching system includes a first thyristor, a second thyristor, a third thyristor, a fourth thyristor, and a controller. The controller calculates a total magnetic flux according to a current magnetic flux of the inductive device and an expected magnetic flux of the second power source. When the power-supplying source is switched, the controller turns off the first thyristor and the second thyristor, and determines whether a commutable time is reached according to a power parameter of the first static transfer switch and the second static transfer switch. When the commutable time is reached, the controller correspondingly turns on at least one of the third thyristor and the fourth thyristor according to the total magnetic flux being less than a threshold.

The invention relates to the field of static frequency converters, and discloses a static frequency converter protection system comprising a control unit used for generating a control signal and performing bidirectional communication with a valve control unit through an optical fiber; the thyristor control unit obtains energy through a circuit and sends a first return signal after energy obtaining is completed; and the valve control unit is used as a bridge between the control unit and the thyristor control unit and is used for receiving and collecting the first return signal. When the forward voltage of the thyristor driven by the thyristor control unit exceeds a set protection value, the thyristor control unit triggers the thyristor emergently, and returns an overvoltage protection signal to the valve control unit at the same time. The valve control unit gathers overvoltage protection signals, and when the number of the thyristors subjected to overvoltage protection at the same time is larger than a tripping constant value set by the valve control unit, the valve control unit sends a tripping request signal to the control unit to inform the control unit of interlocking tripping.

The invention provides a direct-current circuit breaker and a control method thereof, and belongs to the technical field of direct-current middle-high voltage power system fault protection. The short circuit turn-off branch comprises a first capacitor and a first thyristor; the coupling commutation branch comprises a first inductor, a second inductor, a second thyristor and a third capacitor; the rated turn-off branch comprises a first resistor and a second capacitor; the first resistor, the second capacitor, the first capacitor and the second inductor are sequentially connected in series and then are connected with the main switch branch in parallel; the first inductor, the second thyristor and the third capacitor are sequentially connected in series, and the first inductor and the second inductor form mutual inductance. By controlling the on-off of the first thyristor, the first capacitor and the second capacitor are connected in series, the capacitance value is reduced, large-capacitance-value operation of a single group of capacitors is realized, and the problem that the on-off time of rated and lower low-current breaking is relatively long can be solved.

The invention discloses a mesa silicon controlled rectifier with a novel passivation structure and a preparation method thereof, and the mesa silicon controlled rectifier comprises an N-type silicon substrate, the front surface of the N-type silicon substrate and the back surface of the N-type silicon substrate are provided with P-type short base regions, the front surface of the N-type silicon substrate is provided with an N + type emitter region, and the back surface of the N + type emitter region is provided with a P-type short base region. The front surface of the N-type silicon substrate and the back surface of the N-type silicon substrate are provided with silicon dioxide films, and the two sides of the front surface of the N-type silicon substrate and the two sides of the back surface of the N-type silicon substrate are provided with composite passivation structures. Through a four-layer composite passivation structure of oxygen-doped polycrystalline silicon, glass, LPCVD deposited silicon dioxide and polyimide, the oxygen-doped polycrystalline silicon serves as an electric field adjusting layer, surface electric field distribution can be optimized, the glass provides basic mechanical protection, thermal stress is reduced through low-temperature sintering, the LPCVD deposited silicon dioxide serves as an insulating medium, ion migration is blocked, and the surface electric field distribution can be optimized. Polyimide is used as a flexible insulating layer and covers the damaged area of the table top, so that the mechanical performance and the electrical performance reliability of the device are improved.

The invention discloses an impedance-adjustable series hybrid cascade static synchronous compensator and a control method thereof. The method comprises the following steps: acquiring grid-connected point voltage and load current information, and performing positive and negative sequence component analysis on the grid-connected point voltage and load current information; calculating a compensation line current component with the same size and opposite phase as the positive and negative sequence components of the load current so as to compensate the reactive power and the negative sequence current of the grid-connected point load; zero-sequence injection current used for in-phase active power balance is calculated, and reference operation current of each cascade branch is obtained; calculating the output reactive power of each phase based on the cascade branch voltage of each phase and the reference operation current, calculating the corresponding trigger angle of each phase thyristor under the condition that the adjustable impedance bears all phase voltages and generates all reactive power, and generating a pulse control signal to realize the control of the adjustable impedance; and each phase cascade converter adopts quasi-proportional resonance control to track the reference operation current, and generates a corresponding PWM signal to respectively control each phase cascade converter.

A hybrid uninterruptible power supply includes a power conversion unit including a converter electrically connected to a first external alternating current (AC) power source, an inverter electrically connected to an output of the converter and to a load, and a power storage unit electrically connected between the converter and the inverter, a current thrupass unit electrically connected to the first external AC power source and electrically connected to the load and including a first thyristor, a current bypass unit including a second thyristor and a switch electrically connected in parallel to the second thyristor, the second thyristor being electrically connected to a second external AC power source and electrically connected to the load, and a controller configured to control the power conversion unit, the current thrupass unit, and the current bypass unit.

The invention relates to a visual on-load voltage regulation tap switch control system, device and medium, which comprises a single chip microcomputer control circuit, the single chip microcomputer control circuit is connected with a signal processing circuit and a power supply circuit, and the signal processing circuit is connected with a voltage zero cross detection circuit, a voltage sensor and a data acquisition unit. The voltage zero-cross detection circuit, the voltage sensor, the data acquisition unit and the power supply circuit are all connected with the isolation reduction transformer, and the isolation reduction transformer is connected with the low-voltage side voltage of the distribution transformer; the single-chip microcomputer control circuit is further connected with a switch position sensor, a communication circuit, a switch drive circuit and a thyristor trigger circuit. The communication circuit is in communication connection with a remote computer through an RS485. The method has the advantages of realizing automatic voltage regulation conversion, stabilizing voltage, accurately setting visual parameters and realizing non-impact voltage regulation.

A high-efficiency power electronic voltage regulating device with a reclosing function is connected in series with a low-voltage line and comprises a silicon controlled bypass switch, a series power unit, a parallel power unit, an input filtering unit, an output filtering unit, a controller, a topology change-over switch, a mechanical bypass switch, an input switch, an output switch and the like. Under a normal working condition, power is supplied to a user through the silicon controlled bypass switch; through an AI pre-judgment technology, a power grid voltage drop or increase trend is pre-judged, and a series power unit is conducted in advance; a topology change-over switch is connected to form a boost or buck topology, and when the voltage of a power grid is too low or too high, the normal voltage of a user is ensured through PR closed-loop control; when the rear-end line / load breaks down, reclosing control is carried out; and voltage upper and lower limits are adjusted remotely. The device utilizes the AI pre-judgment technology, has the characteristics of stable voltage, no need of input / output commutation and the like, solves the problems of over-high and over-low voltage and automatic reclosing in fault, and improves the high power supply quality and the power supply reliability of users.

The invention discloses an RC-IGCT-based superconducting hybrid DC circuit breaker, and relates to the topological structure and working principle analysis of DC circuit breakers. The circuit topology comprises two parts: (1) a resistance-type superconducting fault current limiter R-SFCL and a UDS isolation switch adopting a TP KEMA arc model are connected in series, and (2) a current commutation component composed of diodes VD1-VD4, a current injection branch and a current commutation branch. VD1-VD4 are used for conducting bidirectional current; the current injection branch comprises a pre-charging capacitor C, an inductor L and a thyristor T which are connected in series; the current commutation branch circuit is formed by connecting a power electronic switch, an RCD buffer branch circuit and an energy absorption branch circuit in parallel, and the energy absorption branch circuit is composed of a metal oxide lightning arrester; the invention further discloses a current breaking method of the superconducting hybrid direct-current circuit breaker. According to the invention, quick switching-off can be realized after fault current occurs, the rise rate of the fault current is limited, and the loss and the cost are low under the normal through-current condition.

The invention discloses a power supply protection type power grid electric energy regulation and control method and system based on optical storage flexible direct current, and the method comprises the steps: connecting the head end of a distribution transformer with the middle and rear ends of a line through a dual-port flexible direct current system, and configuring a plug-and-play energy storage / photovoltaic interface at a direct current side; wherein the converter D1 is connected with the head end of the low-voltage side of the distribution transformer, and the converter D2 is arranged in a voltage-sensitive user concentration area; based on the voltage threshold real-time monitoring result, triggering multi-mode operation of the D1-D2 bidirectional converter, including: when the terminal voltage is lower than a low threshold, starting a D1-D2 power supply mode; when the voltage is higher than a high threshold value, switching to a D2-D1 energy storage charging mode; when 50%-90% of voltage sag is detected, double converters are started for combined power supply; through linkage of rapid turn-off of a thyristor switch and an optical storage system, an emergency power supply channel of D2-users is established when a power grid fails. The power supply quality and the power supply reliability of the power distribution network can be improved.