75 results about "Thyristor switched capacitor" patented technology

The invention discloses a power quality comprehensive compensation system of an electric railway and a control method thereof. The system comprises a railway static power controller RPC and two sets of thyristor switched capacitors TSC. The thyristor switched capacitors bear a large proportion of reactive power compensation, RPC performs active power compensation, harmonic suppression and a remained small proportion of reactive power compensation for two power supply arms, therefore, the capacity of RPC is effectively reduced, and negative sequence, harmonic and reactive comprehensive compensation are realized. The control method comprises a cooperative control policy of RPC and TSC, reference current detection based on reactive separation, a reactive power distribution method and an RPC control method. The power quality comprehensive compensation system of the electric railway greatly improves the power quality of the electric railway with low cost, and the corresponding control method effectively coordinates the operation of RPC and TSC and ensures that the system has good compensation performance and favorable application prospect.

An integrated compensation device consists of detection control unit, thyristor switched capacitor module connected to power network and active electric power filter. It is featured as calculating out reactive volume required to be compensated onto load by said device according load current and system voltage as well as object power factor then issuing different switching commands to thyristor switched capacitor module for realizing the switching operation of compensation branch and confirming command signal of compensation current on said filter to make actual output current of said filter track with variation of command current.

A method for compensating dynamic three-phase unbalanced loadsand and its device characterizing in sampling values of line voltage and load line current of two sample points at the connecting place of the compensation device and the system to compute related sine signal basic wave symmetric component, then to calculate positive and negative sequential compensator threephase equal susceptance, thesum of which is the three-phase susceptance value for compensating load unbalance and providing reactive current for the load, the susceptance reference value to be converted to a control angle signal and an order of the thyristor switched capacitor to be sent to the pulse generation plate and the condenser zero-cross trigger plate for controlling two devices.

The invention discloses a system for compensating the combined negative sequence current of a power regulator and a static var compensator. The system consists of a railway power regulator and the static var compensator. The railway power regulator is installed between two power supplying arms at a secondary side of a traction transformer by two single-phase three-winding reducing transformer. Thestatic var compensator consists of two groups of thyristor switched capacitors which are connected in parallel and a group of thyristor controlled reactors. The thyristor switched capacitors and thethyristor controlled reactors are respectively connected with two traction power supplying arms by single-phase three-winding reducing transformers, wherein the thyristor switched capacitors are installed below the single-phase three-winding reducing transformer which is connected with the power supplying arms with relatively advanced voltage phases, and the thyristor controlled reactors are installed below the single-phase three-winding reducing transformer of the power supplying arms with relatively hysteretic voltage phases. The system can maximally reduce the capacity of the railway powerregulator while also satisfying the requirement of a railway system on the unbalancedness degree of three phase current.

The invention discloses a control method for large wind field reactive-load compensation equipment in low voltage ride through. The control method comprises the follow steps that firstly, information of voltage, current, power and frequency in a power grid is sampled through coordination control of an automatic voltage control system, fault points are detected, and when draught fan low voltage ride through starts, a static var generator is rapidly started to provide reactive power; secondly, compensation capacity of various types of reactive-load compensation equipment is determined according to different installation places and effects of the reactive-load compensation equipment and different principles; thirdly, the static var generator respectively achieves the reactive compensation work state and the harmonic suppression work state by using different control strategies; fourthly, the automatic voltage control system starts a thyristor switched capacitor when power voltage is equal to pre-charged voltage of the thyristor switched capacitor; fifthly, the automatic voltage control system starts a thyristor controlled reactor according to reactive gap information; the fourth step and the fifth step are in parallel with each other.

The invention discloses a hybrid dynamic reactive compensation apparatus and method. The method comprises a mutual inductor, a reactive compensation controller, a thyristor switched capacitor, and a static var generator. To be specific, the mutual inductor is used for collecting a voltage analog signal and a current analog signal of a low-voltage system. The reactive compensation controller is configured to be connected with the mutual inductor to receive the voltage analog signal and the current analog signal and calculate a capacity value of a putting part of the thyristor switched capacitor and a capacity value putted by the static var generator and is configured to be connected to the thyristor switched capacitor to send a first control signal out according to the capacity value of the putting part of the thyristor switched capacitor. The thyristor switched capacitor receives the first control signal and is configured to be connected to a low-voltage system to send a first response reactive current out. The reactive compensation controller is configured to be connected to the static var generator; and the static var generator is configured to be connected to the low-voltage system. According to the hybrid dynamic reactive compensation apparatus and method, the costs are reduced and the compensation precision is improved.

The invention relates to a method and a device for improving supply voltage at the tail end of a long supply arm of a heavy haul railway. The method is characterized in that: a direct hanging thyristor controlled reactor (TCR)-type static var compensator (SVC) is arranged at the outlet end of a Scott main transformer; a plurality of groups of step-down thyristor switched capacitors (TSCs) are arranged at an autotransformer (AT) end at the tail end of the long supply arm at the same time; and the tail end of the supply arm is compensated by using a step-down TSC grouping mode so as to improve the supply voltage at the tail end. The Scott transformer is arranged in a power supply system of the AT of the heavy haul railway and is provided with a T seat outlet end and an M seat outlet end; the T seat and M seat outlet ends of the Scott transformer are provided with a set of SVC devices consisting of a TCR branch and two fixed capacitor branches FC1 and FC2, wherein FC1 is identical to the FC2, so that the whole SVC can be subjected to derating compensation when the set of devices are maintained; and simultaneously, the step-down TSC groups are arranged in uplink, respectively set as three-time and five-time filter branches, wherein the uplink is a heavy climbing line, and downlink is a descending line.

The utility model discloses a testing device of the high-pressure valve of a quartz brake tube slinging capacitor (TSC) as well as a method using the device to conduct TSC valve current test and operation test, which comprises two direct current voltage sources, six auxiliary valves and two relatively independent oscillating circuits composed of two capacitors and two reactors. The testing device realizes different working sequence and test methods by use of the triggering of a series of auxiliary valves, the tested valves are made to operate current and steady-state intensity for a long time under operation test mode and undergo transient state excess current, transient excess voltage and transient heat intensity under excess current test mode, which can both meet the requirements of TSC high voltage valve operation test and excess current test. The utility model adopts the cooperation of resonant circuit and the method of superimposing oscillating current to realize relatively large test current and the test intensity is distributed to two power supplies, which reduces the work intensity of the test device and enhances the safety and reliability.

The invention discloses a method for carrying out intelligent control on the dynamic reactive power compensation of a SVG (TSC) (static var generator (thyristor switched capacitor)), which comprises the following steps of: controlling the SVG and the TSC by using a master control unit; carrying out centralized sampling, calculation and control by using the master control unit, and automatically adjusting to adopt a reactive power compensation mode of the SVG and adopt a reactive power compensation mode of the TSC; and preferably starting the reactive power compensation mode of the SVG, and when the SVG has a fault, adopting the reactive power compensation mode of the TSC. When the reactive power demand of a system is instantly changed dynamically, the SVG starts a PWM (pulse-width modulation) control program at a predetermined response speed firstly, and then outputs compensation currents so as to rapidly and dynamically adjust the variable quantity of reactive power; and when the load of the electric power system is changed within a large range and exceeds the capacity of the SVG, a grouping switch function of the TSC is started so as to compensate the reactive power demand of the system. The method for carrying out intelligent control on the dynamic reactive power compensation of the SVG (TSC), disclosed by the invention, has the advantages that: the response speed of reactive power compensation can be improved, an effect of carrying out dynamic and continuous adjustment on reactive power can be achieved, and the like.

The invention discloses a hybrid compensation system for negative-sequence current in a high speed railway. The hybrid compensation system comprises a railway power regulator, two single-phase three-winding step-down transformers, m groups of thyristor switched capacitors of the same parameter, and a group of thyristor controlled reactors. The railway power regulator is connected with low-voltage sides of the two single-phase three-winding step-down transformers by virtue of joint inductance; high-voltage sides of the two single-phase three-winding step-down transformers are connected with two single-phase power supply arms of a secondary side of a three-phase Vv traction transformer; the m groups of thyristor switched capacitors of the same parameter are arranged on the low-voltage sides of the single-phase three-winding step-down transformers connected with a voltage phase advance power supply arm; and the group of thyristor controlled reactors are arranged on the low-voltage sides of the single-phase three-winding step-down transformers connected with a voltage phase lag power supply arm. According to the hybrid compensation system, the negative-sequence current can be effectively compensated, the power of an active compensation device can be reduced, and the cost is reduced. Therefore, the hybrid compensation system has good development prospects in the field of negative-sequence compensation of the high speed railway.

The invention relates to a two-control three-precharge phase-control switch circuit of a switched capacitor bank, which comprises a three-phase zero switch which consists of two phase-control switches for pre-charging the capacitor bank, the input end of the two phase-control switches is connected with a casecade filtering circuit of a two-phase star connection, the output end of the two phase-control switches is connected with an LC filter circuit of a third phase after being connected with each other, the LC filter circuit of star connection is connected with a three-phase electric-net power source through a high-voltage fuse, and a phase control device independently controls the connection and the disconnection of the two phase-control switches at the peak point of the voltage according to the time order. A casecade circuit of a high-voltage silicon-stack diode and a high-voltage current-limiting resistor is connected with each phase-control switch in parallel so as to realize the pre-charging of the capacitor bank; and at the same time a casecade absorption circuit of RC is connected with each phase-control switch in parallel. The tested waveform shows that: the switching effect of the two-control three-precharge phase-control switch circuit can be switched one time without impact within one second like the TSC (thyristor switched capacitor bank), is free from the power consumption, adopts an ordinary switch as a phase-control switch, and has low cost.

The invention discloses a transformer neutral point capacitance type DC blocking device which comprises a capacitor set, a resistor, a mechanical by-pass switch, a thyristor valve, an electric reactor, a controller, an AC current transformer and a DC current transformer. The thyristor valve and the electric reactor are connected in series to form a quick bypass circuit. A circuit which is formed by the way that the capacitor set and the resistor are connected in series, the quick bypass circuit and the mechanical by-pass switch are connected in parallel to form an entire structure, one end of the entire structure is connected with a wire inlet end, and the other end of the entire structure is connected with the AC current transformer and the DC current transformer in series to be connected with a wire outlet end. The controller is used for receiving signals collected by the DC current transformer and the AC current transformer, and the controller has the functions of detection, control protection and communication. By means of the transformer neutral point capacitance type DC blocking device, the direct current can be isolated, the direct current and the alternating current can be monitored, the DC isolating mode and the ground protection mode can be switched through a thyristor switched capacitor, the vibration and the transient state peak current and voltage cannot happen to the circuits in the switching process, switching is quick, and the electric power system requirement can be met.

The invention relates to a low voltage ride through (LVRT) control system of a fixed-blade stalling type wind generating set. The LVRT control system comprises a thyristor switched capacitor (TSC) type static var compensator (SVC), a revolution speed transducer and an intelligent controller, wherein the revolution speed transducer is installed on a squirrel-cage asynchronous generator; the intelligent controller is used for realizing LVRT control; the TSC type SVC is connected to the three-phase line of the squirrel-cage asynchronous generator and comprises n numbered groups of capacitors which are connected in parallel, and a single group of capacitors are connected with a bidirectional thyristor in series; and the intelligent controller comprises a revolution speed acquiring module, a revolution speed impedance characteristic computing module and a capacity allocating module, the revolution speed impedance characteristic computing module is used for computing the target equivalent capacitive impedance according to revolution speed signals and the inherent characteristic parameters of a motor, and the capacity allocating module is used for allocating each group of capacitors needing to be put into operation according to the computed target equivalent capacitive impedance and sending a closing instruction to the corresponding bidirectional thyristor. According to he invention, good control effect is realized on the premise of lower cost.

The invention discloses a power quality regulation system comprising an active filter, a dynamic reactive power compensation device, a thyristor capacitor switching device, a voltage regulator position on a user load side of a three-phase power line and an on-load regulated capacity transformer positioned on the three-phase power line. N groups of capacitors are arranged on the thyristor capacitor switching device; the active filter, the dynamic reactive power compensation device and the thyristor capacitor switching device are all connected with the three-phase power line; a master controller is arranged on the active filter, the dynamic reactive power compensation device and the thyristor capacitor switching device are connected with the master controller respectively through CAN buses, and a voltage measurement transformer and a current measurement transformer are arranged between the master controller and the grid side of the three-phase power line.

The invention relates to an arc furnace power quality controller based on a programmable logic controller (PLC), which mainly comprises a control system and a power quality improvement system, wherein the control system consists of an industrial personal computer, a PLC and a digital signal processor (DSP); and the power quality improvement system consists of thyristor switched capacitor - thyristor controlled reactor (TSC-TCR) reactive power compensation device and an auxiliary circuit. The controller can adjust compensation parameters in real time to improve compensation accuracy according to instantaneous reactive power in combination with furnace condition information. The arc furnace power quality controller based on the PLC has the advantages that the rapid real-time compensation can be realized aiming at the change of the reactive power and the power factor, the operating cost is low and the control stability is high.

The invention discloses a TSC system and an RS485 communication method thereof based on an FPGA. The aim of dynamic reactive power compensation is achieved through connection and disconnection between an antiparallel thyristor switched capacitor TSC and a power grid; the capacity of the TSC system is divided into switching units with a plurality of capacity levels; the TSC is used for sending a control command by adopting a DSP (Digital Signal Processor) and transmitting the control command to the switching units connected in parallel through a 485 bus, wherein each switching unit comprises a switching module, an FPGA chip, an optical coupler, an RS485 chip and an interface of the RS485 chip; each FPGA chip is used for receiving and fetching the control command by use of an asynchronous communication serial logic circuit as well as controlling and monitoring the switching module according to the control command. Through the way, the TSC system and the RS485 communication method thereof based on the FPGA can be used for detecting and monitoring the switching units in the TSC by adopting FPGA and RS485 communication technologies and also are helpful to increase the precision of the dynamic reactive power compensation.

The invention relates to an intelligent high-voltage thyristor switched capacitor (TSC) reactive compensation device which comprises a potential current transformer, a signal adjusting unit, a digital signal processor (DSP) main control and display unit, an optical fiber isolation and thyristor driving unit and a reactive compensation main wiring unit, wherein the signal adjusting unit comprises a voltage amplitude adjustment module, a current amplitude adjustment module, a synchronous square wave generation module, a filter module and a lifting module which are sequentially connected; outputs of the synchronous square wave generation module and the lifting module are respectively connected with an input capture hole and an analog-to-digital (AD) conversion hole of a DSP in the DSP main control and display unit; an output input / output (IO) port of the DSP in the DSP main control and display unit is connected with an input end of an optical fiber transmitter of the optical fiber isolation and thyristor driving unit; and an output end of the optical fiber isolation and thyristor driving unit is connected with a gate pole and a cathode of a thyristor in the reactive compensation main wiring unit. The intelligent high-voltage TSC reactive compensation device realizes zero-crossing voltage input and capacitor bank cyclical switchover, does not have the problem of switching oscillation, and is used for reactive compensation of transformer substations in the industries such as metallurgy, steel and coal.

The invention discloses a triggering device and a triggering control method for a thyristor valve block of a high-voltage TSC (thyristor switched capacitor), and belongs to the field of electric system controllers. With the triggering device and the triggering control method, the problems of complex structures of existing triggering devices and complexity of existing triggering control methods are solved. A control unit is connected with the triggering device. The triggering control method includes that an external clock circuit is adopted to provide clock signals to a logical processing unit, collected SIN signals are judged to acquire switching time, switching signals are outputted according to the switching time, and the switching signals are converted to optical signals through a light transmission circuit to be outputted to a light receiving circuit after being amplified by a driving circuit; and the light receiving circuit outputs electric pulse signals to an optical-coupling isolation circuit II, and input sides of two optical-coupling isolation circuits are switched on simultaneously when the electric pulse signals are of low levels, so that two triggering signals are outputted by two triggering units to gate poles of the thyristor valve block of the high-voltage TSC simultaneously. The triggering device and the triggering control method are applicable to electric systems and industrial systems.

The invention relates to a dynamic reactive power compensation control method, and the method is characterized in that a static dynamic reactive power compensation device is incorporated into a power distribution network, then the system voltage, load current and current signal of a thyristor-controlled separable-type electric reactor on an access point of the static dynamic reactive power compensation device are monitored in real time, a susceptance value to be compensated of each phase of the static dynamic reactive power compensation device is calculated in real time, so that a trigger angle of a thyristor in the thyristor-controlled separable-type electric reactor and on-off of a thyristor in a parallel thyristor switched capacitor can be controlled. The method has the remarkable characteristics that the dynamic response time of the static dynamic reactive power compensation device is guaranteed by utilizing the open-loop control, and the steady accuracy of the entire device is guaranteed by utilizing the closed-loop control, so that the dynamic response time and the steady accuracy of the static dynamic reactive power compensation device can be guaranteed. The method can be applied to the field with rapid and frequent load change and has a good application prospect.

The invention provides a distribution transformer reactive power compensation method which is a reactive power compensation new method of a 'massive quantity power supply' distribution transformer. Through carrying out reactive power compensation at a transformer low voltage side, the average power factor of a transformer high voltage side is raised. The method comprises a step of connecting reactive power compensation equipment to the low voltage side of a distribution transformer, a step of taking the current of a power transformer high voltage side and voltage of the high voltage side or low voltage side as the control signal of the reactive power compensation equipment, a step of dynamically outputting reactive power with a constant power factor as the control target of a static var generator (SVG) or with a power factor as the switching criterion of a thyristor switched capacitor (TSC) and compensating the reactive power needs of the transformer and a load so as to raise the average power factor of the transformer high voltage side.

The invention relates to a pole-mounted rural power grid low-voltage comprehensive improving device and method. The pole-mounted rural power grid low-voltage comprehensive improving device is connected in series on a rural power grid power transmission line, and comprises a sampling control module, a voltage compensation module, a reactive compensation module and a protection system. The voltage compensation module is used for improving the output voltage of the device; the reactive compensation module is used for compensating inductive reactive power in the system in real time according to the power factor of the system to improve power factor; the sampling control module is used for collecting voltage and current signals at the installation place automatically and controlling adjustment of voltage and power factor of the device; and the protection system is used for giving response time to the device and sending an alarm signal when fault occurs. The device is mounted on a telegraph pole in a transformer area; a controller obtains real-time voltage data from a sampling unit; the controller controls a contactor in each gear of a transformer to switch, thereby realizing voltage improvement, ensuring outlet voltage of the device is stabilized within 190 V-240 V, and realizing voltage stabilization; and a thyristor switched capacitor realizes reactive compensation.

The invention discloses a fully-controlled intelligent type electric energy quality correction apparatus applied to a distribution network. The fully-controlled intelligent type electric energy quality correction apparatus comprises an active part, a passive part, a controller and a transformer, wherein the active part comprises a static var generator; the passive part comprises a thyristor switching capacitor and a capacitor adjusting and reinforcing apparatus; the transformer is mounted between a three-phase power grid and a load; the output end of the transformer is connected with the controller; the static var generator, thyristor switching capacitor and the capacitor adjusting and reinforcing apparatus are all connected to the three-phase power grid in parallel; and the controller is connected with the static var generator, thyristor switching capacitor and the capacitor adjusting and reinforcing apparatus separately. According to the correction apparatus, the electric energy quality problem is roughly compensated by the passive part, and then is accurately compensated by the active part, so that joint advantages of the active and passive technologies are played, thereby lowering the cost of the apparatus and improving the cost performance of the apparatus. The invention also discloses a fully-controlled intelligent type electric energy quality correction method applied to the distribution network.

The invention discloses a triggering system of a thyristor switched capacitor valve set. According to the triggering system of the thyristor switched capacitor valve set, an energy-taking unit obtains energy needed by the triggering system for operation from high potential, a power supply monitoring unit sends a fault signal to a logical unit when the obtained energy is not sufficient, a voltage detecting unit outputs a signal to the logical unit when detecting that the voltage of the positive electrode of the thyristor reaches a set value, the logical unit returns an optical pulse to a superior controlling unit when receiving the output signal of the voltage detecting unit, the logical unit controls a triggering amplifying unit to trigger turn-on of the thyristor when receiving a trigger optical pulse, the triggering amplifying unit triggers the normal turn-on of the thyristor in a controlling box of the logical unit, and a following triggering unit automatically triggers the turn-on when the turn-on of the thyristor delays. The triggering system of the thyristor switched capacitor valve set is reliable in operation, strong in anti-jamming capacity, free of the high-voltage isolation problem, particularly applicable to thyristor switched capacitor valve set triggering systems of a 35kV voltage class or over-35kV voltage classes, and capable of solving the triggering problem of the serial thyristor valve set.

The invention discloses a novel dynamic TSC (thyristor switched capacitor) and SVG (static var generator) hybrid reactive compensation device and method. The device comprises an SVG controller, an SVG power unit and TSC branches, wherein the SVG power unit comprises a breaker, a current sampling unit, an electric reactor and an IGBT (insulated gate bipolar transistor) module. The SVG controller is used for calculating reactive power demanded by a system; voltage fluctuation and flicker are inhibited in time due to the characteristic of high dynamic response speed of an SVG, and after a load is stabilized, the TSC branches are put into use to reduce reactive power provided by the SVG; after the load is shut off, excessive reactive power is quickly absorbed through dynamic response of the SVG, and then the TSC branches are cut off step by step. The characteristic of high dynamic response speed of the SVG can be used to inhibit the voltage fluctuation and flicker, and meanwhile, the defect of insufficient SVG capacity can be overcome; and meanwhile, the SVG works in a low load state, the service life of the SVG is prolonged, accurate compensation can be realized, and the inhibition capacity of voltage fluctuation and flicker is greatly improved.

The invention discloses a reactive power compensation device and method for a distributed photovoltaic power station. The reactive power compensation device for the distributed photovoltaic power station comprises photovoltaic inverters with reactive power adjustability, photovoltaic arrays, a TSC (thyristor switched capacitor), an AVC, a transformer, a load, a low-voltage first busbar and a medium-high voltage second busbar, wherein the photovoltaic inverters, the photovoltaic arrays, the TSC and the load access the first busbar and then are connected to the second busbar through the transformer. The reactive power compensation device and method for the distributed photovoltaic power station have better economic efficiency because total cost of the TSC and the AVC is lower than that of anSVG (static VAR compensator), the power factor of the distributed photovoltaic power station is adjusted for the first time by the TSC, the AVC detects the power factor of the distributed photovoltaic power station in real time by and sends a reactive power adjusting instruction to the photovoltaic inverters, the power factor of the distributed photovoltaic power station is adjusted for the second time by the AVC and the photovoltaic inverters, and the problem that a large quantity of low-order harmonic waves are produced by adopting a TCR (thyristor-controlled reactor) for reactive power compensation is solved.

The invention discloses a TSC (thyristor switched capacitor) switching method, a terminal device and a computer readable storage medium. The method comprises when the terminal device receives a switching signal, determining whether a current capacitor residual voltage value is less than a current grid voltage peak value; when the current capacitor residual voltage value is less than the current grid voltage peak value, determining whether a phase difference between a current grid voltage phase and a current capacitor phase is within a preset angle range; and when the phase difference is withinthe preset angle range, sending a pulse signal to the target TSC in order that the target TSC is turned on after receiving the pulse signal. The method can improve the accuracy of zero-cross detection, shortens switching time, increases switching speed and efficiency, and avoids the impact of inrush current on the grid.

A reactive power compensator. The reactive power compensator includes a power transformer having an AC bus side and a compensator bus side, wherein the power transformer is connectable to an AC grid at the AC bus side. The reactive power compensator further includes a thyristor-switched capacitor and a thyristor-controlled reactor connected to the compensator bus side. The reactive power compensator includes a booster transformer connected in series with the power transformer and to the compensator bus side. The invention also relates to computer programs and computer program products.

The invention relates to a photoelectric trigger device based on a high-voltage thyristor switched capacitor (TSC), which is respectively connected with a high-voltage thyristor switched capacitor and a trigger board of a thyristor valve string. The photoelectric trigger device comprises a trigger logic board, a light-emitting board and a residual capacitor voltage detection device, wherein the trigger logic board is respectively connected with the light-emitting board and the residual capacitor voltage detection device. The photoelectric trigger device adopts the logic processing unit on thetrigger logic board as the logic operation core to receive various control commands and angle signals, and the detection of the residual capacitor voltage is used as criteria of the phase angle and the valve string direction for the first input moment to complete the logic operation of Phase A, Phase B and Phase C, thereby making the hierarchy clear and the logic simple, and facilitating the maintenance and the follow-up upgrading and development.