70 results about "Shunt reactor" patented technology

The utility model belongs to the field of paralleling reactors, and relates to a low-noise extra-high voltage paralleling reactor iron core structure which comprises iron core columns, an upper cross beam, an upper pressing beam, a lower foot pad and an iron yoke of a rectangular frame type structure, fourth pull screw rods are installed at the front ends and the rear ends of the left side and the right side of the periphery of the iron yoke, and fifth pull screw rods are installed at the front ends and the rear ends of the upper side and the lower side of the periphery of the iron yoke. VII pull screws are mounted at two corners of the upper end of the inner circumference of the iron yoke and close to the inclined seam of the iron yoke, first shock pads are mounted between the fourth pull screw, the fifth pull screw and the seventh pull screw and the iron yoke, insulating base plates and second shock pads are mounted between the upper cross beam, the upper pressing beam and the lower foot pad and the iron yoke, and an insulating rubber plate of an L-shaped structure is mounted on the outer side of the iron yoke and close to the inclined seam of the iron yoke. According to the utility model, the clamping force of the iron yoke is increased by adding the iron yoke clamping structure, and the transmission of noise is blocked while the vibration is reduced by adding the pull screw rod and arranging the insulating rubber plate at the inclined seam of the iron yoke; and by arranging a shock pad, noise generated by resonance of the pull screw rod is further reduced.

A three-phase adaptive reclosing method and system for wind farm transmission lines based on parallel reactor current is provided. When a phase to phase or three-phase fault occurs in the transmission line, the circuit breakers at both ends trip. The current transformer is used to sample the three-phase current signal of the parallel reactor, calculate the differential mode current of the parallel reactor, and perform zero crossing detection to construct a fault nature identification criterion. The fault nature is determined within the maximum discrimination time limit combined with the sliding time window. For permanent faults, the reclosing device is locked; for transient faults, calculate the time when the fault disappears and determine the reclosing time, and open the reclosing device. The method and system identifies the nature of faults by detecting whether the differential current of parallel reactors crosses the zero axis, with low sampling rate requirements, and small errors.

The utility model belongs to the technical field of reactors, and particularly relates to an extra-high voltage shunt reactor oil tank composite noise reduction structure which comprises a rubber plate fixedly installed in an oil tank wall, the outer side of the rubber plate is attached to the surface of the inner side wall of the oil tank wall, and a sound absorption hole-free paperboard is fixedly installed on the inner side of the rubber plate. A double-layer composite perforated plate sound absorption mechanism is fixedly installed on the inner side of the sound absorption hole-free paperboard, gaps are reserved among the rubber plate, the sound absorption hole-free paperboard and the double-layer composite perforated plate sound absorption mechanism, and a gap is reserved between two layers of perforated plates of the double-layer composite perforated plate sound absorption mechanism. The double-layer composite perforated plate sound absorption mechanism comprises a first perforated paperboard and a second perforated paperboard. The composite noise attenuation structure composed of the rubber plate and the multiple layers of insulating paper plates is arranged on the inner side wall of the oil tank, vibration waves transmitted from insulating oil are blocked and weakened through material combination of different media, vibration noise can be reduced, and the composite noise attenuation oil tank is an important measure for solving the problem of noise of an electric reactor.

The invention discloses an analytical calculation method suitable for the magnetic saturation current of a high-voltage shunt reactor under a resonance working condition. The method comprises the following steps: establishing an electromagnetic coupling equivalent circuit model under the resonance working condition of the shunt reactor considering the magnetic saturation characteristic of an iron core; dividing the magnetization characteristic of the iron core into an unsaturated section and a saturated section through piecewise linearization processing of the magnetization curves, and setting the slopes of the two sections of magnetization curves and the magnetic field intensity at the knee point of a demarcation point; according to the working state of the reactor, constructing an electromagnetic coupling equation set containing a first-order conducting term coefficient in an unsaturated state, and deducing a time domain analytical expression of winding current; constructing an electromagnetic coupling equation set considering a zero-sequence coupling effect in a saturated state, simplifying resistance parameters, and then deducing a current solution expression in an equivalent inductance matrix form; the current value of the three-phase winding of the shunt reactor is monitored in real time, when the current amplitude of the winding reaches a knee point value, state switching is triggered, the final value of the previous state is used for updating the initial condition of the next state, and the current waveform is solved.

The application discloses a novel lung lobe-shaped magnetic shielding partial discharge detection device and a detection method. The device comprises an isolation transformer, a bushing, a detection electrode and a partial discharge instrument. A single-phase power supply is connected with a reactor in parallel, and then connected with an input end of the isolation transformer. One end of an output end of the isolation transformer is connected with the bushing, and then connected with the detection electrode. The other end of the output end of the isolation transformer is grounded. A grounding end of a to-be-detected lung lobe-shaped magnetic shielding is grounded, and the grounding end of the to-be-detected lung lobe-shaped magnetic shielding is connected with the partial discharge instrument. The to-be-detected lung lobe-shaped magnetic shielding and the detection electrode are correspondingly arranged to form an equivalent capacitor and are coupled and connected. The application can be used to determine whether there is a defect in the lung lobe-shaped magnetic shielding by performing a partial discharge test on the lung lobe-shaped magnetic shielding before the lung lobe-shaped magnetic shielding is assembled into a transformer. The application has the characteristics of high test efficiency and low applied voltage, and greatly improves the first-time pass rate of the transformer product provided with the lung lobe-shaped magnetic shielding.

The invention discloses an electric power protection system, a control method and a related product. The power protection system comprises a controller, a switch assembly and a three-phase shunt reactor, the three first ends of the switch assembly are connected with the three-phase alternating current circuits in a one-to-one correspondence mode, the three second ends of the switch assembly are connected with the first ends of the three-phase shunt reactors in a one-to-one correspondence mode, and the second ends of the three-phase shunt reactors are connected together. A controller configured to obtain a three-phase AC voltage and a three-phase AC current; obtaining three-phase interphase impedance according to the three-phase alternating voltage and the three-phase alternating current; according to the three-phase interphase impedance, judging whether the reactor has a turn-to-turn short circuit fault or not; and under the condition that the reactor has a turn-to-turn short circuit fault, the switch assembly is controlled to be switched off. According to the embodiment of the invention, whether the reactor has the turn-to-turn short circuit fault or not is judged through the three-phase interphase impedance, and the switch assembly is controlled to be switched off under the condition that the reactor has the turn-to-turn short circuit fault, so that the safety of a power grid is improved.

The application discloses an oil-immersed shunt reactor defect vibration simulation test device and method, which comprises an oil tank, an iron core and a winding wound on the iron core arranged in the oil tank, a water content online monitoring device connected with the oil tank through an interface pipeline and used for monitoring the water content of the insulation oil in the oil tank in real time, an oil chromatography online monitoring device connected with the oil tank through an interface pipeline and used for monitoring the set gas content of the insulation oil in the oil tank in real time, a heating element arranged in the oil tank and used for heating the oil sample, a vibrating element arranged below the oil tank and used for generating vibration of a set frequency, and defect elements arranged on the iron core and the winding respectively and used for simulating the defects of the reactor. The application can simulate the vibration defects, local overheating defects and suspended discharge defects of the reactor and accumulate a large amount of defect diagnosis test data through monitoring electric and chemical characteristic quantities.

The invention provides a dry-type hollow shunt reactor winding inter-strand short circuit fault identification method, and relates to the technical field of power equipment fault diagnosis. The method comprises the following steps: acquiring current and voltage waveforms of a reactor; calculating a current effective value and a voltage effective value in the latest n periods, and an average phase difference between the voltage and the current in the n periods; the average equivalent resistance in the latest n current periods is calculated; calculating an average power factor in the latest n current periods; calculating the average active power loss in the latest n current periods; calculating an average power factor angle in the latest n current periods; judging whether the reactor has an inter-strand short-circuit fault or not; judging whether the reactor has a same-turn inter-strand short-circuit fault or not; judging whether the reactor has a short-circuit fault between different turns and the like; according to the method, the difference between the set parameter change rate threshold values is multiple orders of magnitude, so that the identification accuracy of the same-strand and different-turn inter-strand short-circuit faults of the dry-type shunt reactor is greatly improved.

The application discloses a dry-type hollow shunt reactor overvoltage protection device and belongs to the technical field of overvoltage protection of power transmission and transformation equipment. When system operation overvoltage occurs, the frequency absorption unit can reduce the oscillation frequency of overvoltage, slow down the rising front of overvoltage, solve the damage of high-frequency components to the reactor winding, and inhibit the overvoltage peak value. When the frequency absorption unit cannot inhibit the overvoltage peak value, the overvoltage absorption unit plays a role in limiting the overvoltage peak value, and the insulation level of the reactor is enhanced. Through the application of the voltage monitoring and conversion unit, when the reactor is normally operated or the overvoltage is lower than the operation threshold value, the high-speed control switch is turned on, the explosion-proof separation unit is short-circuited and bypassed, and the frequency inhibition absorption unit and the overvoltage absorption unit bear the main protection task. When the monitored voltage exceeds the set threshold value or the absorption unit fails or is subjected to thermal breakdown, the high-speed control switch is turned off, the explosion-proof separation unit is connected to the circuit, the faulty unit is timely removed, and the fault expansion is prevented.

The utility model provides an alternating-current parallel hybrid converter and a direct-current power transmission system, and relates to the technical field of high-voltage direct-current power transmission. The AC parallel hybrid converter comprises: a current source converter; the alternating current side of the voltage source converter is connected with the alternating current side of the current source converter in parallel; and one end of the reactor is connected with the alternating current side of the current source converter, and the other end is connected with an alternating current system. The AC parallel hybrid converter filters 6k + / -1 harmonic waves by using a voltage source converter, the high-voltage DC power transmission system directly adopts a six-pulse bridge circuit, and a converter transformer is replaced by an electric reactor, so that the converter structure of the high-voltage DC power transmission system is simplified, and the equipment manufacturing cost is reduced.

The application provides a converter, a control method thereof, a storage medium and a flexible direct current power transmission system. The converter comprises: a multi-phase bridge arm, each phase bridge arm comprising a series connection of an upper bridge arm and a lower bridge arm, the upper bridge arm and the lower bridge arm each comprising a series connection of a switching circuit and a plurality of sub-modules, the switching circuit comprising a reactor and a plurality of switching modules, the switching module comprising a first controllable switch tube, a first diode and a first energy absorption module, the first controllable switch tube being connected in antiparallel with the first diode, the first energy absorption module being connected in parallel with the first controllable switch tube, the reactor being connected in series with the first controllable switch tube of the plurality of switching modules in turn, and neither the upper bridge arm nor the lower bridge arm comprising a lightning arrester. The application at least solves the problem of high loss of the converter in the prior art.

The application discloses a kind of generator phase-advancing capability analysis method and system based on power grid transient stability constraint, comprising the following steps: according to power grid system stability and converter station bus voltage control condition obtains single machine maximum phase-advancing depth;According to single machine maximum phase-advancing depth, obtain the phase-advancing depth of power plant and the phase-advancing depth reserved by whole plant.This application mainly aims at the problem that the regulation range of other regulating means such as shunt reactor is limited when voltage is too high due to excessive reactive power, fully considers factors such as stator end heating and power angle static stability, determines single machine maximum phase-advancing depth, considers the most serious situation of overvoltage of DC converter station, determines the phase-advancing capability of power plant and the phase-advancing capability reserved by whole plant after DC fault tripping based on whether steady-state overvoltage exceeds voltage limit, fully develops the voltage regulating capability of generator, so as to more economically and efficiently ensure the stable operation of power grid voltage.

A shunt reactor is presented comprising a primary winding (1) and a steel core (2). The steel core comprises a bottom yoke (3), a top yoke (4), a first limb (5), a second limb (6) and a main limb (7). The first limb, the second limb and the main limb are arranged in parallel and between the top yoke and the bottom yoke to form a support to a magnetic flux passing through the steel core. The primary winding is wound around the main limb to generate the magnetic flux passing through the steel core. The shunt reactor further comprises an auxiliary winding (8; 8') arranged to be wound around the bottom yoke, the top yoke, the first limb or the second limb and configured to generate an auxiliary electric power from the magnetic flux generated by the primary winding. The primary winding and the auxiliary winding are electrically insulated from the steel core and from each other. A cooling fan (12) is configured to be driven by the auxiliary electric power generated by the auxiliary winding.

The utility model relates to a kind of external insulation test system for dry shunt reactor considering complex environmental influence, and the test cavity is surrounded by insulation test box, high-voltage test power supply is set to the outside of insulation test box, air circulation heating and humidifying device and illumination device are all set in test cavity, the monitoring end of remote and on-site monitoring device is set in test cavity, the injection end of salt fog device and the injection end of spraying device are all set in test cavity;High-voltage test power supply is used to apply test voltage and test current to the dry shunt reactor to be measured;Compared with traditional examination test system, the external insulation performance of dry shunt reactor can be examined under the influence of complex environment, the weather resistance of dry shunt reactor insulation system is evaluated, and the operation reliability of dry shunt reactor is improved;At the same time, the accuracy of examination is improved.

The invention discloses an ultra-high voltage shunt reactor turn-to-turn fault detection method based on equivalent resistance variation, which comprises the following steps: dividing a fault phase winding into a grid-connected side non-short-circuit section, a short-circuit turn section and a neutral point side non-short-circuit section, and defining the number of turns, resistance, self-inductance and mutual inductance parameters of each section; constructing a Kirchhoff voltage and current equation set based on the electrical parameters of each section of winding, and deducing a phasor relationship between a fault phase head end current and a turn current in combination with a short-circuit current relational expression; the terminal voltage of the shunt reactor is expressed as a function of head end current, and an equivalent impedance analytical expression containing the short-circuit turn ratio and the transition resistance is obtained; setting a minimum identification threshold of a short-circuit turn ratio and a maximum tolerance threshold of a transition resistor, traversing all equivalent resistance calculation values in the range of the two thresholds, and multiplying the minimum value by a reliable coefficient to serve as a fault criterion setting value; three-phase voltage and current data are collected in real time, a fundamental wave phasor is extracted to calculate an equivalent resistance measurement value, and if any phase measurement value exceeds a setting value, the turn-to-turn fault is determined.

The utility model discloses an insulation noise reduction structure of an extra-high voltage oil-immersed shunt reactor, which comprises a plurality of layers of insulation partition plates, a cork rubber pad, a non-adhesive laminated wood fastener, a hot-pressed polyester resin plastic laminated board fastener and a lastrum laminated wood bracket, and the two adjacent layers of insulation partition plates are separated by the cork rubber pad. And the insulating partition plate is fixed on the box wall of the extra-high-voltage oil-immersed shunt reactor through the cork rubber pad, the non-adhesive laminated wood fastener, the hot-pressed polyester resin plastic laminated board fastener and the Lushi laminated wood bracket. The insulation noise reduction structure has enough mechanical strength and certain flexibility, integrates the advantages of reliable mechanical structure, reliable insulation, noise absorption and the like, and solves the problems of high ground potential field intensity and low noise attenuation in a high-voltage line end outgoing line area. The low-noise electric reactor has the advantages of being capable of improving the ground insulation strength of the high-voltage line end and absorbing and attenuating noise, and is suitable for the design of low-noise electric reactors with the grade of 750 kV to 1100 kV.

The application discloses a kind of offshore wind farm reactive power optimization configuration method and device, the method comprises: according to the preset equivalent calculation model, using wind farm reactive power shortage determines first reactive power shortage surface and second reactive power shortage surface, and obtains first capacitive reactive power compensation and first inductive reactive power compensation;The wind power generator set is calculated under the condition of no load and full load wind farm reactive power shortage, determine high-voltage shunt reactor capacity, with harmonic resonance as constraint condition, after grouping high-voltage shunt reactor capacity, combined with the objective function constructed by the sum of dynamic compensation device investment cost annual value and annual active network loss, and with static voltage stability margin, first capacitive reactive power compensation, first inductive reactive power compensation and voltage deviation as constraint condition, the compensation capacity of dynamic reactive power compensation device is optimized and calculated.Reduces comprehensive cost and improves the security of reactive power configuration.

The present application is applicable to the technical field of substations, and provides a method, device, equipment and storage medium for determining the electric energy loss power of a substation. The method includes: obtaining the rated loss power of each primary device in the substation, as well as the actual transmission capacity and rated transmission capacity of the substation, and determining the sum of the first rated constant loss power and the sum of the first rated variable loss power of each transformer device, and determining the sum of the second rated constant loss power and the sum of the second rated variable loss power of each parallel capacitor device, and determining the sum of the third rated constant loss power of each parallel reactor device, and determining the sum of the third rated variable loss power of each busbar device, and also determining the sum of the fourth rated constant loss power and the sum of the fourth rated variable loss power of each switch device, and then determining the electric energy loss power. The data required by this method is less difficult to obtain, which improves the convenience of the method for determining the electric energy loss power of the substation.

The present application provides a capacitance compensation method and device for withstand voltage and partial discharge testing of ultra-high voltage shunt reactors, belonging to the field of reactor capacitance compensation. The method includes obtaining the inherent capacitance parameters of the winding, separating the high-frequency and low-frequency components, analyzing the spatial coupling path, calculating the temperature and humidity-induced capacitance offset, generating a collaborative capacitance parameter matrix after weighted fusion, introducing a nonlinear polarization attenuation factor and dynamically calibrating it, establishing a capacitance compensation benchmark model, and performing compensation through a multi-stage compensation device. Through dynamic modeling, the present application accurately compensates capacitance, suppresses voltage distortion, and improves the sensitivity of partial discharge detection, solving the problems of insufficient accuracy and poor adaptability of traditional compensation.

This invention relates to the field of reactors, specifically disclosing a parallel reactor with anti-corrosion function. The reactor body includes a reactor body with a fan blade rotatably mounted at its top center. The fan blade is driven by a horizontal plate, and an extension plate is fixedly connected to the top side of the reactor body. Through the horizontal plate, lubricating oil within its internal cavity remains on the top wall of the reactor body via through-holes. This oil seal on the top of the reactor body effectively prevents bird droppings from corroding the top wall. Furthermore, during rainfall, the oil film on the surface of the reactor body effectively guides rainwater, preventing rainwater residue on the top wall.

The invention provides a programmable voltage source circuit, a power supply device and a power electronic device experiment system, and relates to the technical field of electronic devices.The scheme includes that the programmable voltage source circuit comprises a voltage source sub-module, the voltage source sub-module comprises a full-bridge circuit, an alternating-current capacitor, a first one-way conduction device, an electric reactor and an energy complementing module, the alternating-current capacitor is connected with the full-bridge circuit in parallel, and the first one-way conduction device is connected with the electric reactor; the first end of the electric reactor is connected with a first bridge arm intermediate node of the full-bridge circuit through a first one-way conduction device, the second end of the electric reactor is connected with a second bridge arm intermediate node of the full-bridge circuit, and the energy supplementing module is connected with the first one-way conduction device in parallel and used for supplementing energy when current flowing out of the electric reactor is lower than a reference current value. According to the programmable voltage source circuit, the current flowing out of the electric reactor is compensated, so that voltage rising or falling at the two ends of the alternating current capacitor is more stable, the reliability of the output voltage of the programmable voltage source circuit is improved, the load object of the circuit can be a current converter, and the circuit can provide stable voltage for the experiment of the current converter.

The invention provides a sound insulation cover field sound insulation effect evaluation method based on oil tank vibration and sound signal inversion, and relates to the technical field of substation reactor sound insulation cover noise field evaluation. The method comprises the following steps: firstly, collecting surface vibration data of the extra-high voltage shunt reactor, and calculating an average sound pressure level of body noise according to the surface vibration data; constructing a multi-sound-source noise calculation model, and combining the frequency domain data of the full-band noise of the receiving point to solve the sound propagation attenuation under each frequency; a sound source single-band sound power inversion model is further established, and the sound power and the full-band sound power spectrum of the sound source are obtained; and finally, the insertion loss of the acoustic enclosure is calculated according to the full-band sound power spectrum and the average sound pressure level of the body noise, and accurate quantitative evaluation of the field sound insulation effect of the acoustic enclosure is realized. The method can effectively overcome the defects that traditional measurement is easily interfered by environmental noise and real insertion loss cannot be obtained.

The paralleling reactor with the iron core cake limiting function comprises a frame body mechanism and an auxiliary mechanism, the frame body mechanism comprises a vacuum sound insulation sleeve, a coil is arranged in the vacuum sound insulation sleeve, an iron core cake is arranged in the coil, and an assembly through hole is formed in the middle of the iron core cake in a penetrating mode. Through the arrangement of the pressing rods and the adjusting bolts, after an iron core cake is extruded, the adjusting bolts are adjusted to enable the two pressing rods at the opposite angles to be close to each other, in this way, the rubber buffer sleeve can be inserted into the upper inclined pressing groove and the lower inclined pressing groove, a gap is partially filled, and the rubber buffer sleeve deforms along with extrusion; according to the technical scheme, the edge of the iron core cake is limited, in this way, in the using process, vibration of the edge of the iron core cake can be absorbed through the rubber buffer sleeve, generated noise can be reduced, meanwhile, the vacuum sound insulation sleeve is arranged in a matched mode, noise can be further restrained, sound generated in the working process is reduced, and therefore the influence on the environment is reduced.

This invention discloses a method and system for identifying permanent faults in ultra-high voltage (UHV) AC transmission lines, comprising: acquiring fault waveform data of the instantaneous three-phase voltage values ​​after a fault in an UHV transmission line with shunt reactors, and determining the two faulty phases experiencing interphase faults based on the fault waveform data; calculating the interphase differential mode voltage between the two faulty phases based on the fault waveform data; taking the extinction of the arc at the fault point after the circuit breaker trips as the starting time, performing sliding window integration on the interphase differential mode voltage according to a preset time window to obtain the integrated value of the interphase differential mode voltage; within a preset time window, if the integrated value of the interphase differential mode voltage is continuously less than a preset integration threshold, or simultaneously satisfies the condition that the integrated value of the interphase differential mode voltage is greater than the preset integration threshold but the number of sampling points is continuously less than a preset number, then a permanent fault is determined to have occurred. The method of this invention can be applied to fault type analysis of UHV transmission lines and provides scheduling and operation decisions for maintenance personnel.

The application provides a programmable voltage source circuit, a power supply device and a power electronic device experiment system, relates to the technical field of electronic circuits, and the scheme comprises a voltage source submodule, the voltage source submodule comprises a full-bridge circuit, an alternating current capacitor, a first unidirectional conducting device, an electric reactor and a power compensation module, the alternating current capacitor is connected in parallel with the full-bridge circuit, the first end of the electric reactor is connected with the first bridge arm intermediate node of the full-bridge circuit through the first unidirectional conducting device, the second end of the electric reactor is connected with the second bridge arm intermediate node of the full-bridge circuit, the power compensation module is connected in parallel with the first unidirectional conducting device, and the current flowing out of the electric reactor is compensated for when the current flowing out of the electric reactor is lower than a reference current value, so that the voltage rise or drop of the alternating current capacitor is more stable, and the reliability of the output voltage of the programmable voltage source circuit is improved, and the load object of the circuit can be a converter, namely, the circuit can provide stable voltage for the experiment of the converter.

The invention provides a design method for an equivalent scaling model of a high-voltage shunt reactor. The design method comprises the following steps: step 1, determining an initial scaling coefficient range according to research requirements; step 2, predicting and optimizing model parameters by utilizing machine learning based on a dynamic similarity criterion; 3, verifying the effectiveness of the model through multi-physics field coupling simulation; and Step 4, in combination with machine learning, model parameters are adjusted in real time to adapt to dynamic operation conditions. By integrating multi-physics field coupling and machine learning, the method is used for dynamic optimization of the scaling model of the high-voltage electrical equipment, can adapt to calculation of different scaling coefficient models under complex working conditions, considers coupling of various physics fields, and can process nonlinear phenomena and dynamic working conditions of the electrical equipment by dynamically optimizing parameters.

The invention belongs to the field of high-voltage shunt reactor detection, and particularly provides a reactor equivalent scaling model construction method and device based on winding vibration characteristic invariability, and the method comprises the steps: determining an equivalent scaling coefficient; determining that the mass, the rigidity and the stress have the same change according to the consistency of vibration characteristics before and after equivalence and a kinetic equation of the winding; adjusting current and winding turns according to a scaling principle; adjusting the number and the area of the winding cushion blocks according to a scaling principle; and establishing a simulation model of the high-voltage shunt reactor and the equivalent scaling model thereof in simulation software, comparing the prototype reactor with the equivalent scaling model, and if the deviation is large, repeating scaling model reconstruction until the deviation meets the requirement. The electric reactor scaling model with a typical iron core winding structure is designed by adopting the method, and the electric reactor scaling model is used for reflecting the electric characteristics of an original model electric reactor by measuring the test data of the scaling model.

A high-power four-quadrant converter system includes a double-secondary-side oil-immersed rectifier transformer with an output connected to four three-phase bridge type thyristor rectifiers, wherein every two rectifier bridges share a group of rectifier transformer secondary sides; two rectifier bridges sharing a group of rectifier transformer secondary sides are inversely connected in parallel, one of the two rectifier bridges realizes a forward output, and the other one realizes a reverse output; two groups of rectifier bridges which output in the same direction can operate independently or in parallel; when the two groups of rectifier bridges operate in parallel, reactors are connected in parallel to realize current sharing; and the rectifier bridges for the forward output and the reverse output realize free smooth transition under control of a controller, so that a four-quadrant operation of an output current is realized. When the system operates, the electromagnetic compatibility of sensitive components is high.

The invention belongs to the technical field of electrified railway traction power supply, and particularly relates to a through cable bilateral power supply system, a working method and a control method thereof. The system is composed of a single-phase high-voltage traction cable, a main traction substation, a plurality of single-phase traction substations and a traction network. The main traction substation comprises a main traction transformer and a power flow controller, the single-phase traction substation comprises a single-phase traction transformer and a shunt reactor, the cable voltage is 110kV, and the traction bus voltage is 27.5 kV. During working, three-phase power grid electric energy is subjected to voltage reduction through the main traction transformer, part is directly supplied to a traction bus, and part is connected after being adjusted by the power flow controller; the high-voltage cable transmits electric energy to each single-phase traction substation, part of the electric energy is subjected to reactive compensation through the reactor after voltage reduction, part of the electric energy enters a traction network, and finally the bus and the substation electric energy are converged into the network to supply power to a train. According to the control method, the stability of the system is guaranteed by detecting voltage, collecting network side parameters, calculating a target value and reference current of the power flow controller and dynamically adjusting power flow.

The utility model relates to the field of electric reactor fault simulation, especially a single -phase double -column parallel electric reactor fault simulation device, device main part is double silicon steel sheet core column structure, winding winding on the column, four around set up iron yoke, still be equipped with electrical fault simulation unit and mechanical fault simulation unit, wherein electrical fault simulation unit includes the front insulating plate and a plurality of taps of setting in device main part front, simulate the fault of turn -to -turn short circuit through short -circuit tap, the more short -circuit tap, represent the more serious fault, short -circuit tap of different position, represent the position of fault occurrence is different, and mechanical fault simulation unit includes the first loose simulation unit for simulating winding loose fault.