45 results about "Saturable reactor" patented technology

The invention provides a converter valve saturable reactor fault identification method and system based on an improved Gramb angle field, and relates to the technical field of power equipment fault identification, and the method comprises the steps: collecting vibration voiceprint data during the operation of a target converter valve saturable reactor; performing data preprocessing on the vibration voiceprint data to obtain preprocessed time sequence data; performing feature extraction on the preprocessed time series data on the basis of an improved Gramb angle field and a principal component analysis method so as to convert the preprocessed time series data into two-dimensional image data; inputting the two-dimensional image data into a trained fault type identification model to obtain an identification result; and generating a fault diagnosis report according to the identification result. According to the method, the problem of accurate fault identification of the saturable reactor in a complex environment of a converter valve hall is effectively solved.

The invention provides a voiceprint-based converter valve saturable reactor screw looseness detection system and method, and the method comprises the steps: collecting a sound wave signal during the operation of a saturable reactor based on a sound wave signal collection module, and carrying out the preprocessing of the collected sound wave signal based on a preprocessing module, the method comprises the following steps: preprocessing a sound wave signal, carrying out time-frequency analysis on the preprocessed sound wave signal based on a wavelet transformation module to obtain time-frequency domain analysis data, converting the time-frequency domain analysis data into a gray fusion image based on a gray fusion image generation module, building a ResNet model based on a ResNet model module, and training the ResNet model based on the obtained gray fusion image to obtain a trained sound wave signal; and inputting a gray fusion image of a sound wave signal to be detected into the trained ResNet model to realize looseness detection. The device can accurately capture the symptom of screw loosening at an early stage, improves the detection sensitivity and reliability, can adapt to a complex operation environment, and is convenient to use.

The present invention discloses a low-noise, low-loss self-saturating inductor and a manufacturing method thereof, wherein the inductor comprises: a single-arm iron core, a control winding and a mounting frame; the single-arm iron core is mounted on the mounting frame, and the control winding is arranged on the single-arm iron core; the single-arm iron core is formed by stacking a plurality of quasi-elliptical iron core cakes; shock-absorbing pads are arranged between adjacent quasi-elliptical iron core cakes; the top of the quasi-elliptical iron core cake at the top and the bottom of the quasi-elliptical iron core cake at the bottom are both provided with shock-absorbing pads; a polyester belt for tightening the quasi-elliptical iron core cake and the shock-absorbing pads is provided on the iron core; the present invention adopts the quasi-elliptical iron core cake, thereby reducing the amount of silicon steel sheets used, and at the same time, provides shock-absorbing pads and tightens the iron core cake with polyester belts, thereby effectively reducing noise during operation; in addition, the insulating base is made of special insulating material and glass fiber reinforced plastic screws and nuts are used, thereby eliminating the eddy current loss of the copper busbar current on the insulating base of the inductor, thereby reducing operating losses.

The invention relates to the technical field of high-voltage direct-current power transmission, and particularly provides a saturable reactor field detection method and device, and the method comprises the steps: collecting high-frequency parameters of an in-operation saturable reactor, and analyzing the abnormal conditions corresponding to the high-frequency parameters of the in-operation saturable reactor; on-site detection is carried out on the in-operation saturable reactor based on the abnormal condition corresponding to the high-frequency parameter of the in-operation saturable reactor; wherein the high-frequency parameters comprise volt-second product, impact inductance and current ratio. According to the technical scheme provided by the invention, the performance change of the in-operation saturable reactor is mastered through the high-frequency parameters of the in-operation saturable reactor, and accurate evaluation of the state of the in-operation saturable reactor and rapid discrimination of the fault are realized, so that safe and reliable operation of the ultra-high-voltage direct-current converter valve is ensured.

The present invention relates to direct current transmission technology, and specifically to a method for determining the voltage and current during the turn-off process of a thyristor converter valve of an anode saturated reactor. The method comprises: simplifying the external circuit of the thyristor converter valve during the turn-off transient process; establishing a thyristor equivalent circuit during the turn-off transient process; establishing an equivalent model of the stored charge inside the thyristor during the turn-off process, taking into account the tolerance of the thyristor and setting different stored charges to obtain a thyristor equivalent model during the turn-off transient process; establishing an SR nonlinear model of the anode saturated reactor; obtaining the voltage and current magnitude of the thyristor converter valve at any moment during the turn-off process, as well as the voltage and current waveforms of the thyristor converter valve during the entire turn-off process. This method accurately analyzes the impact of the anode saturated reactor on the turn-off process; takes into account the different turn-off times caused by different stored charges due to the tolerance of the thyristor and the resulting impact, and can obtain the voltage across the thyristor and the current flowing through the thyristor at any point in the entire turn-off process.

The invention provides an anti-resonance device of an electromagnetic voltage transformer for a GIS (Gas Insulated Switchgear). The anti-resonance device comprises a sub-harmonic anti-resonance circuit, a fundamental harmonic anti-resonance circuit and a higher harmonic anti-resonance circuit, the anti-resonance circuits are connected in parallel and then are connected to the PT opening triangle side. According to the sub-harmonic anti-resonance circuit, when sub-harmonic resonance occurs in a system, a nonlinear saturable reactor reaches a saturated state, and flowing current causes instantaneous loss, so that generation of the sub-harmonic resonance is inhibited; the fundamental harmonic anti-resonance circuit generates an electric field when current passes through an inductive element, and charges of the electric field are accumulated in a capacitor; two ends of the mutual inductor are connected in parallel or in series with a capacitor to form an LC series resonance circuit; the capacitor destroys resonance conditions in a loop to suppress fundamental harmonic waves; according to the high-order harmonic anti-resonance circuit, when voltage rise and current increase are detected, a high-power resistor in a secondary circuit enables zero sequence voltage to be in short circuit, inductance generated by mutual inductor overload changes resonance conditions in the secondary circuit, and high-order harmonics are eliminated. And the safety of the system is improved.

The utility model discloses a current-limiting protection device of a current transformer, which comprises a saturable reactor, a protection box and a binding post, the saturable reactor is connected with a lead, the saturable reactor is fixed in the protection box through epoxy resin, the binding post comprises a conductive post, an inner insulation sleeve and an outer insulation sleeve, the inner insulation sleeve is embedded in the protection box, and the outer insulation sleeve is embedded in the protection box. The outer insulation sleeve is sleeved on the inner insulation sleeve on the inner side of the protection box and forms an accommodating hole for installing the conductive column, a nut I and a nut II are separately arranged on the conductive column in the protection box, two flat washers are arranged between the nut I and the nut II, and the lead is fixed between the two flat washers. The binding posts can be connected through a bridging lead, the bridging lead is fixed between the two flat washers, a limiting blocking piece is arranged on the conductive column outside the protective box, a rotary knob is assembled at the outer end of the conductive column, a rotary knob metal insert is embedded in the rotary knob, and an external equipment lead can be connected between the rotary knob metal insert and the limiting blocking piece. According to the utility model, internal and external leads can be quickly connected, the technology of pouring epoxy resin can be simplified, and the efficiency is improved.

The invention relates to an iron core loss detection device and method for a saturable reactor. The device comprises a high-frequency power supply, a power analyzer, a universal meter, a first test winding and a second test winding, the high-frequency power supply is connected with the power analyzer, the power analyzer is connected with the first test winding, the second test winding is connected with the universal meter, and the device further comprises a lifting rod, a supporting mechanism and a lifting control mechanism. The first test winding and the second test winding are fixedly connected to the supporting mechanism and are arranged outside the lifting rod in a sleeving mode, the lifting rod penetrates through the supporting mechanism to be connected with the lifting control mechanism, and when the end of the lifting rod is connected with a to-be-tested iron core obtained in advance, the lifting control mechanism controls the lifting rod to descend. The iron core to be tested is located in the first test winding and the second test winding. Compared with the prior art, the method has the advantages of accurately calculating the unit loss of the iron core, rapidly screening the iron core with relatively stable heating according to the loss and the like.

The present invention provides a method for suppressing small current oscillation of a fast recovery diode based on a saturated reactor, wherein a saturated reactor with a magnetic core is used to construct a semiconductor device power module, and the saturated reactor with a magnetic core is obtained by the following steps: A. For the semiconductor device power module, an air-core adjustable reactor is used as a commutation reactor, and the reactance value of the air-core adjustable reactor is adjusted to a first expected value that does not damage the semiconductor device power module during commutation when a switching behavior occurs; B. The inductance value of the air-core adjustable reactor is repeatedly increased until the switching behavior under any current does not cause low current oscillation, and the inductance value L of the air-core adjustable reactor is confirmed at this time; C. Based on the inductance value L obtained in the step B, the inductance value of the saturated reactor with a magnetic core when it is not saturated is determined to design the saturated reactor with a magnetic core. The IGCT module realized by the present invention has a small volume, good oscillation suppression effect, and high efficiency.

The invention discloses an intelligent shutdown decision-making method based on looseness prediction of an anode saturable reactor, and the method comprises the following steps: S1, collecting the historical information of different operation times for the anode saturable reactors of the same model; s2, calculating feature information of the anode saturable reactor according to historical information of different operation times, and converting the feature information into continuous time sequence data with a time label; s3, constructing an LSTM network, training the LSTM network by using the continuous time sequence data with the time label, and obtaining the trained LSTM network as a prediction model of the looseness degree; and S4, based on a reinforcement learning mode, obtaining an intelligent shutdown decision. According to the invention, the shutdown maintenance opportunity can be dynamically decided before a fault occurs, and the production continuity (frequent shutdown is avoided) and the equipment safety (major faults are avoided) are balanced.

The application discloses a voltage stabilizing control system and method for an aluminum electrolysis control circuit, and relates to the technical field of electronic control circuits.The voltage stabilizing control system comprises a voltage collecting module, a PID operation module and a control voltage output module connected in sequence.The input end of the voltage collecting module and the input end of the control voltage output module are connected with the voltage collecting end of the aluminum electrolysis control circuit.The output end of the control voltage output module is connected with the saturable reactor of the aluminum electrolysis control circuit.The voltage collecting module acquires the voltage at the current time and the voltage at the previous time of the voltage collecting end.The PID operation module generates a control signal according to the voltage at the current time and the voltage at the previous time.The control voltage output module generates a target voltage according to the control signal and the voltage at the current time, and takes the target voltage as the voltage of the saturable reactor, so that the aluminum electrolysis control circuit works.The application improves the quality of aluminum electrolysis.

The invention discloses a low-noise low-loss self-saturation reactor and a manufacturing method. The reactor comprises a single-arm iron core, a control winding and a mounting frame, the single-arm iron core is mounted on the mounting frame, and the control winding is arranged on the single-arm iron core; the single-arm iron core is formed by stacking a plurality of ellipse-like iron core cakes; a shock pad is arranged between every two adjacent ellipse-like iron core cakes; shock pads are arranged at the top of the ellipse-like iron core cake at the topmost end and the bottom of the ellipse-like iron core cake at the bottommost end; the iron core is provided with a polyester belt used for tightening the ellipse-like iron core cake and the shock pad. According to the invention, the ellipse-like iron core cake is adopted, the use amount of silicon steel sheets is reduced, and meanwhile, the damping pad is arranged and the iron core cake is tightened by the polyester tape, so that the noise during operation is effectively reduced; besides, the insulating base is made of special insulating materials, and the glass fiber reinforced plastic screw and the glass fiber reinforced plastic nut are used, so that eddy-current loss of copper bar current on the insulating base of the reactor is eliminated, and operation loss is reduced.

The invention relates to the technical field of aviation power supplies, in particular to a preparation method of a high-power direct-current power supply for airplane ground starting, which comprises the steps of main loop design and control loop design. Continuous large starting current can be provided for an aircraft. During specific use, 380V three-phase alternating current is connected, when input voltage changes or loads change, output voltage can be automatically adjusted and stabilized, specifically, the power supply manufactured through the method outputs a specific voltage value + 28.5 V through the design of a three-phase saturable reactor, the design of a main transformer and the design of a control loop, continuous work can be achieved, the power reaches 15KW, and the instantaneous maximum power is 30KW; the device can be used for ground starting and ground power-on inspection of the airplane; meanwhile, the high-power direct-current stabilized power supply can be used in other places needing high-power direct-current stabilized power supplies.

The invention discloses a saturable reactor for press fitting with a thyristor, and relates to the technical field of direct current power transmission equipment, the saturable reactor comprises a shell, a fixing piece, a plurality of iron cores, a coil, a wiring terminal and a cooling assembly, the shell comprises a left shell and a right shell, the left shell and the right shell are spliced to form an inner cavity, and avoiding openings are formed in the upper end and the lower end of the shell; the wiring terminals are connected with the two ends of the coil, and the cooling assembly is wound around the iron core. The saturable reactor formed by the shell, the fixing piece, the plurality of iron cores, the coil and the wiring terminal can be pressed together with the thyristor to form a compact module, so that the space occupation volume is reduced, the miniaturization of the module is realized, the plurality of saturable reactors can be continuously connected in series, pressed and disassembled through the wiring terminal, and the manufacturing cost is reduced. The required inductance value and the volt-second characteristic are superposed; and through the arranged cooling assembly, heat dissipation is conducted on the interior of the saturable reactor, damage caused by too high temperature in the saturable reactor is avoided, and the service life of the saturable reactor is prolonged.

The application discloses a high-stability shell-type saturated reactor and relates to the technical field of reactors. The high-stability shell-type saturated reactor comprises a device base and a reactor shell. The reactor shell is fixedly installed on the top surface of the device base. A waterproof telescopic pipe is fixedly installed on the inner wall bottom end surface of the reactor shell. A damper is fixedly installed on the inner wall of the waterproof telescopic pipe. The damper is lifted by the adjusting lead screw through the rotation of the turbine. The polyurethane contact plate and the clamping plate form a rigid vibration conduction path. After the vibration is absorbed by the two-stage buffer spring and damper, the residual energy is guided into the foundation through the conduction platform. The damper is lifted synchronously to pull the oil distribution pipe. The oil distribution is redistributed so that most of the cooling oil enters the inside of the hose. The reactor is forcibly cooled, so as to make up for the defects that the service life of the reactor is reduced due to vibration and high temperature when the core winding suspended in the inside of the reactor shell is in high-load operation.

The invention relates to a system (2) for converting a first voltage (U1) into a second voltage (U2), comprising an electromagnetic interference filtering stage (4) and an active power factor correction stage (6) connected to an output of the electromagnetic interference filtering stage (4), the active power factor correction stage (6) comprises a bidirectional synchronous bridge rectifier (16) and at least one high-frequency electronic switching branch (18) connected to the output of the rectifier (16) via at least one main inductor (8), the number of high-frequency electronic switching branches being equal to the number of main inductors, the electrical energy conversion system (2) further comprises a saturable reactor (9) having a saturation current threshold, the inductance of said reactor (9) when unsaturated being substantially equal to the inductance of the main inductor (8).

The invention discloses a chip-type saturable reactor unit and a saturable reactor group, and relates to the technical field of direct current transmission, the chip-type saturable reactor unit comprises an iron core of a sheet-shaped annular structure, a sheet-shaped winding fixed on the iron core, and a first busbar and a second busbar which are electrically connected with the winding; one end of the first busbar and one end of the second busbar are electrically connected with two leading-out terminals in the winding respectively; the other end of the first busbar and the other end of the second busbar are leading-out ends of the chip type saturable reactor unit and are used for being connected with other chip type saturable reactor units. The chip-type saturable reactors are connected in series and in parallel to form the saturable reactor group, so that the electrical parameters, the through-flow level and the insulation level of the saturable reactors for any engineering can be achieved; the series-parallel connection of the reactor unit structure can be realized only by adjusting the positions of the busbars and the busbar lead-out holes, and the design compactness and integrity of the reactor are ensured to the greatest extent.

The invention discloses a temperature rise simulation test device and method for a saturable reactor under pulse voltage. The temperature rise simulation test device for the saturable reactor under pulse voltage comprises a continuous pulse voltage generation module, a cooling water module and a measurement module. The continuous pulse voltage generation module comprises an AC power supply, a rectification silicon stack, an energy storage capacitor, a continuous pulse generator and a switching frequency regulator. The measuring module comprises an optical fiber temperature sensor arranged on the surface of the saturable reactor. And the temperature of the saturable reactor at different time degrees is measured through the optical fiber temperature sensor so as to measure the temperature rise of the saturable reactor during testing. The test device is formulated according to the heating characteristics of the saturable reactor, the heating of the iron core of the saturable reactor caused by the turn-on and turn-off processes of the thyristor in reality is truly reproduced, and the accuracy of the temperature rise test result of the saturable reactor is improved. The invention further provides a test method.

The utility model discloses a high-heat-dissipation low-loss converter valve, which comprises a heat dissipation bottom plate, a first power control assembly, a second power control assembly, a damping capacitor, a voltage-sharing capacitor, a damping resistor, a voltage-sharing resistor and a saturable reactor, the first power control assembly, the second power control assembly, the damping capacitor, the voltage-sharing capacitor, the damping resistor, the voltage-sharing resistor and the saturable reactor are all fixedly installed on the upper surface of the heat dissipation bottom plate, and the first power control assembly and the second power control assembly are connected through a connecting bridge; the first lower pole piece is connected with the first upper pole piece and matched with the first fins to achieve effective heat dissipation of the first thyristor, the second lower pole piece is connected with the second upper pole piece and matched with the second fins to achieve effective heat dissipation of the second thyristor, and meanwhile the connecting bridge is matched with the grid plate through the structure of the connecting bridge to further conduct auxiliary heat dissipation. And the first thyristor and the second thyristor carry out self heat dissipation through self structures, so that the power loss of the thyristors caused by high temperature is reduced.

The invention relates to a portable voltage surge characteristic detection device for a saturable reactor, which comprises a shell, a relay is arranged on one side of the bottom in the shell, and a battery mounting groove for mounting a rechargeable battery pack is formed in one side of the relay. The battery mounting groove comprises a first fixing plate, a second fixing plate and clamping plates located on the two sides of the battery mounting groove. A sliding groove is formed in each clamping plate, a sliding block is connected in each sliding groove in a sliding mode, the sliding blocks are connected with hinge shafts, and the two sliding blocks are hinged to a first fixing plate and a second fixing plate through the hinge shafts respectively; first telescopic grooves located in the two sides of the battery mounting groove are formed in the bottom of the interior of the shell. A clamping plate is elastically connected into the first telescopic groove; and the rechargeable battery pack supplies power to the detection device. Compared with the prior art, the device has the advantages of being small in size, capable of being adjusted and stabilized according to the size of the rechargeable battery pack, capable of achieving portable detection of the voltage impact characteristic of the saturable reactor and the like.

The invention discloses an ellipse-like self-saturation reactor iron core, manufacturing equipment and a manufacturing method. The ellipse-like self-saturation reactor iron core is formed by winding a silicon steel sheet coil stock; the shape of the center through hole of the ellipse-like self-saturation reactor iron core is the same as the overall shape of the ellipse-like self-saturation reactor iron core, and the ellipse-like self-saturation reactor iron core is ellipse-like. Welding spots for fixing are arranged at the ends of the silicon steel sheet coils on the inner side and the outer side of the quasi-elliptical self-saturable reactor iron core; according to the invention, the ellipse-like iron core structure is adopted to replace a traditional annular iron core, so that the consumption of silicon steel sheets is reduced, the material cost is reduced, the iron core is superior to the traditional structure in the aspects of strength, volume, weight, loss, noise and other performances, the cross section of the iron core is smaller, the loss is in direct proportion to the weight during operation, the loss is lower, and the noise is greatly reduced after pouring.

The present invention discloses an elliptical self-saturating reactor core, a manufacturing device and a manufacturing method. The elliptical self-saturating reactor core is formed by winding silicon steel sheet coils. The shape of the central through hole of the elliptical self-saturating reactor core is the same as the overall shape of the elliptical self-saturating reactor core, which is elliptical. The ends of the silicon steel sheet coils on the inner and outer sides of the elliptical self-saturating reactor core are provided with welding spots for fixation. The present invention adopts a elliptical core structure to replace the traditional circular core, which not only reduces the amount of silicon steel sheets used and reduces the material cost, but also is superior to the traditional structure in terms of strength, volume, weight, loss and noise. The core has a smaller cross-section, and the loss during operation is proportional to the weight, the loss is lower, and the noise is greatly reduced after casting.

The invention provides a design method of a magnetic saturable reactor based on a composite material and the reactor, and belongs to the technical field of magnetic saturable reactors. A double-phase composite magnetic material is prepared by adopting a melt rapid quenching method, a magnetic circuit equivalent circuit model of a four-column type iron core structure is established, and air gap geometric parameters are optimized; a game model with the purposes of minimizing eddy current loss and maximizing an iron core lamination coefficient is constructed to carry out silicon steel sheet thickness sequence optimization, silicon steel sheets and a composite material are processed into a specified geometric structure according to a section shape function calculation result, and a complete magnetic circuit is formed through a connection mode that a working winding is connected in series and a control winding is connected in parallel. And finally, the residual magnetism state of the double-phase composite magnetic material is changed by adjusting and controlling the current of the winding, so that the reactance value is linearly adjusted and controlled within a rated range, and the technical problem that the adjustment precision and the response speed are difficult to guarantee simultaneously in the wide-range reactance value adjustment process of the magnetic saturable reactor is solved.

The embodiment of the invention discloses an electrolytic aluminum load regulation boundary and demand side response control cost calculation method, which comprises the following steps of: analyzing the influence of an anode effect on an electrolytic aluminum production process, and determining an anode effect influence factor; based on the anode effect influence factors, an electrolytic aluminum load production safety boundary considering a voltage regulation margin is established; based on the anode effect influence factors, electrolytic aluminum load control cost caused by the anode effect is quantified; based on the electrolytic aluminum load production safety boundary and the electrolytic aluminum load control cost, the control cost calculation in the electrolytic aluminum load demand side response process is further refined in combination with the dynamic relation between the saturable reactor voltage regulation quantity and the anode effect occurrence probability, and a control cost model comprehensively considering the dynamic anode effect is obtained; the control cost caused by the anode effect can be quantified, and the adjustment strategy of the electrolytic aluminum load is optimized, so that the control cost is reduced, and the economical efficiency and feasibility of power grid demand response are improved.

The invention relates to the technical field of reactor thermal design, in particular to a reverse design method and system for an anode saturable reactor iron core structure, and the method comprises the steps: constructing a reverse generation network and a forward verification network; generating a recommended iron core thickness combination through a reverse generation network according to target temperature distribution set by a designer, and generating predicted temperature distribution and manufacturing tolerance sensitivity according to the recommended iron core thickness combination and the forward verification network; generating adjusted target temperature distribution according to the target temperature distribution, the predicted temperature distribution, the manufacturing tolerance sensitivity and a preset design qualified threshold; and generating an optimal iron core thickness combination and optimal temperature distribution according to the adjusted target temperature distribution. Through the bidirectional coupling neural network model and the interactive feedback mechanism, the physical realizability of the target temperature distribution can be evaluated at the initial stage of design, a designer is guided to correct an unpractical target, and invalid design is avoided.

The invention discloses a high-stability shell-type saturable reactor, and relates to the technical field of reactors, the high-stability shell-type saturable reactor comprises an equipment base and a reactor shell, the reactor shell is fixedly mounted on the top end surface of the equipment base, and a waterproof telescopic pipe is fixedly mounted on the bottom end surface of the inner wall of the reactor shell; a damper is fixedly mounted on the inner wall of the waterproof telescopic pipe; a turbine rotates to enable an adjusting lead screw to jack a damper, a polyurethane contact plate is connected with a clamping plate to form a rigid vibration conduction path, after vibration is absorbed by a cushioning spring and the damper in a two-stage mode, residual energy is guided into a foundation through a conduction platform, and the damper ascends to synchronously pull an oil way to distribute a circular pipe to move; and the oil path is redistributed, so that most cooling oil enters the hose to forcibly cool the reactor, and therefore, the defect that the service life of the reactor is shortened due to vibration and high temperature when the iron core winding suspended in the reactor shell is in high-load operation in the prior art is overcome.

The invention provides an equivalent circuit of a controllable commutation converter and a control method thereof, the equivalent circuit comprises a first simulation module, a second simulation module, a saturable reactor and a power assembly, the power assembly comprises a semiconductor device, the first simulation module comprises a first charging unit and a first discharging unit, the first charging unit is used for charging the first discharging unit, and the second simulation module comprises a second charging unit and a second discharging unit. The first discharge unit is used for discharging to the second simulation module through the saturable reactor so as to simulate discharge of lightning arresters connected in parallel to two ends of a single converter valve in the controllable commutation converter; the second simulation module comprises a second charging unit and a second discharging unit, the second charging unit is used for charging the second discharging unit, and the second discharging unit is used for discharging the semiconductor device so as to simulate the discharge current of the lightning arrester connected in parallel to the two ends of the semiconductor device in the converter valve; the problem that the aperiodic trigger working condition of simultaneous discharge of two lightning arresters in the hybrid controllable commutation converter cannot be accurately simulated is solved.

The utility model provides a current conversion system, which comprises an alternating current source end, a direct current line end and at least one phase of main circuit, the at least one phase of main circuit is connected between the alternating current source end and the direct current line end, the at least one phase of main circuit comprises an upper bridge arm and a lower bridge arm, the upper bridge arm and the lower bridge arm are respectively connected to the direct current line end; the reactor assembly is arranged between the upper bridge arm and the lower bridge arm of the at least one phase of main circuit; when the upper bridge arm and the lower bridge arm of the at least one phase of main circuit work, the current rising rate is limited through at least one part of the reactor assembly. The converter system provided by the utility model not only can greatly reduce the demand for the saturable reactor, but also can effectively suppress the current oscillation caused by the discharge of the stray capacitor in the periodic trigger opening process, and meanwhile, the reactor is externally arranged, thereby reducing the risk of the vibration of the valve and the water leakage of the reactor to the safe operation of the valve.

The invention discloses an anti-saturation reactor, and belongs to the technical field of reactors. An annular magnetic core structure is adopted, the magnetic core is made of a soft magnetic material and is provided with a closed or non-closed magnetic circuit, continuous or quasi-continuous magnetic performance gradient distribution is formed on at least one dimension of a magnetic circuit path, and the gradient shows that a material corresponding to an area with high magnetic field intensity has higher anti-saturation capacity; and the anti-saturation capability is relatively weak in a region with relatively low magnetic field intensity. According to the scheme, the problems of complex process, serious flux leakage, insufficient anti-saturation capability, high high-frequency loss and the like caused by the fact that a traditional electric reactor depends on air gaps or dissimilar material splicing are solved. The magnetic circuit design is simplified through integrated forming, the air gap defect is eliminated, the anti-saturation capacity and the energy storage efficiency are remarkably improved, the gradient magnetic performance is naturally matched with magnetic field distribution, the local saturation risk is reduced, splicing is avoided, the mechanical reliability is improved, the cost is controllable and the performance is stable due to high-automation preparation, and the requirements for high magnetic conductivity and anti-saturation are met.

The invention discloses an incoming end impedance calculation method of a saturable reactor broadband equivalent circuit model, and relates to the technical field of impedance analysis of a power system. In the method, a broadband equivalent circuit model of a saturable reactor in the converter valve is equivalent to a passive two-port network connected with a load; carrying out decoupling equivalent operation on inductors containing mutual inductance in the passive two-port network; taking each element except a load in the decoupled saturable reactor broadband equivalent circuit model as a two-port, and determining a transmission parameter matrix of each two-port; obtaining a transmission parameter matrix of the passive two-port network according to a two-port cascade principle and the transmission parameter matrix of each two-port; and determining the input end impedance of the saturable reactor broadband equivalent circuit model according to the relationship between the transmission parameter matrix of the passive two-port network and the input end voltage, the input end current, the output end voltage and the output end current. According to the method, the calculation efficiency of the input end impedance of the saturable reactor broadband equivalent circuit model can be improved.