CN205374691U - Excitation system static test appearance - Google Patents
Excitation system static test appearance Download PDFInfo
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- CN205374691U CN205374691U CN201620020031.8U CN201620020031U CN205374691U CN 205374691 U CN205374691 U CN 205374691U CN 201620020031 U CN201620020031 U CN 201620020031U CN 205374691 U CN205374691 U CN 205374691U
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Abstract
The utility model provides an excitation system static test appearance, it includes source transformation device, load resistance and record ripples controlling means, and transformation loop, three -phase contravariant return circuit and three -phase LC filtering circuit are kept apart including the input rectification that connects gradually and filtering circuit, DCDC to the source transformation device to and source transformation controller, this record ripples controlling means includes voltage sampler, current sample ware, logic controller, the embedded industrial computer be connected with logic controller to reach memory and the buffer be connected with embedded industrial computer, wherein voltage sampler and current sample ware include the multichannel sampling channel respectively, and every way sampling channel all is provided with a AD converter, the transmission interface that embedded industrial computer passes through control parameter is connected with the source transformation controller of source transformation device, this kind of tester need not to go on loaded down with trivial details operations such as scene wiring again, can be tested surveying excitation system very conveniently, has simplified test procedure.
Description
Technical field
This utility model relates to excitation system field tests, in particular to excitation system static tester.
Background technology
In recent years China's power construction is advanced by leaps and bounds, improve rapidly at the single-machine capacity building electromotor unit, the rated excitation voltage of electromotor and exciting current are all increasing, the safety of excitation system increasingly seems particular importance, static debugging in early days is tested and in major overhaul test, excitation system static test (small area analysis test) is an extremely important test.
The purpose of excitation system static test is the basic control function of the environmental test field regulator creating a simulation, the ability that pulse reliably triggers, IGCT integrity etc..Check phase sequence and the phase place in synchronizing signal loop simultaneously, check that whether the triggering pulse of actuator is correct, check whether IGCT power bridge all can reliably trigger, check that whether SCR-output waveform is correct.Excitation system static test needs the equipment such as the alternating current power supply of external 380V, three-phase regulator, resistance is appropriate and power is suitable ohmic load and oscillograph.
Current excitation system static test substantially all adopt the equipment such as interim three phase mains, three-phase regulator, load resistance, oscillograph to build temporarily after test, such wiring is sufficiently complex, workload big, relevant device not easily prepares and equipment performance is not easy to meet test requirements document.
Utility model content
In view of this, the purpose of this utility model embodiment is in that to provide excitation system static tester, to simplify excitation system test equipment, promotes the convenience of test.
This utility model embodiment provides a kind of excitation system static tester, including: electric power conversion apparatus, load resistance and record ripple control device；This electric power conversion apparatus includes the input rectifying and filter circuit, DC/DC isolated variable loop, three-phase inversion loop and the three-phase LC filter circuit that are sequentially connected with and the power conversion controller being connected respectively with input rectifying and filter circuit, DC/DC isolated variable loop, three-phase inversion loop and three-phase LC filter circuit；This record ripple controls device and includes: voltage sample device, current sampler, logic controller, the built-in industrial control machine being connected with logic controller, and the memorizer being connected with built-in industrial control machine and buffer, wherein voltage sample device and current sampler include multi-channel sampling passage respectively, and every road sampling channel is provided with an A/D converter；Logic controller controls the sampling gear of A/D converter, and controls the program control gear of each sampling channel of voltage sample device and current sampler；
Built-in industrial control machine is connected with the power conversion controller of electric power conversion apparatus by controlling the coffret of parameter；
Power conversion controller, by adjusting the Trigger Angle (i.e. silicon controlled Trigger Angle in input rectifying and filter circuit) of input rectifying and filter circuit, controls the voltage magnitude that electric power conversion apparatus exports；Power conversion controller is additionally operable to three-phase inversion loop is carried out over-current detection and protection, and three-phase LC filter circuit carries out output voltage and output electric current measurement；
Three-phase LC filter circuit is connected with tested excitation system, and tested excitation system is connected with load resistance by three-phase commutation bridge；Three-phase commutation bridge is sampled by voltage sample device and current sampler with the voltage and current on load resistance connecting path.
Wherein, DC/DC isolated variable loop adopts high frequency transformer to realize.
Above-mentioned input rectifying and filter circuit adopt controlled fullwave rectification bridge to realize.
Above-mentioned fullwave rectification bridge is controlled power supply, phase detecting circuit, phase-shift circuit by synchronizing signal transformator, isolation, Phototube Coupling triggers and output controllable silicon is integrated.
Above-mentioned DC/DC isolated variable loop includes: single-phase inversion loop, high frequency transformer, commutating circuit and the LC filter circuit being sequentially connected.
Inductance in above-mentioned three-phase LC filter circuit adopts the ferrum nickel powder core magnetic coil inductor of high magnetic flux rate, and electric capacity adopts noninductive CBB electric capacity.
Above-mentioned load resistance is aluminum resistance.
Above-mentioned built-in industrial control machine also includes the Ethernet interface being connected with extraneous upper monitoring machine.
Above-mentioned logic controller is FPGA (field programmable gate array).
Above-mentioned electric power conversion apparatus is arranged in the nowel of portable cabinet, and record ripple controls device and load resistance is arranged in the top box of described portable cabinet.
The excitation system static tester that this utility model embodiment provides includes electric power conversion apparatus, record ripple controls device and load resistance；And electric power conversion apparatus includes the input rectifying and filter circuit, DC/DC isolated variable loop, three-phase inversion loop and the three-phase LC filter circuit that are sequentially connected with and the power conversion controller being connected respectively with above-mentioned loop；This record ripple controls device and includes voltage sample device, current sampler, logic controller, the built-in industrial control machine being connected with logic controller, and the memorizer being connected with built-in industrial control machine and buffer, wherein voltage sample device and current sampler include multi-channel sampling passage respectively, and every road sampling channel is provided with an A/D converter；Logic controller controls the sampling gear of A/D converter, and controls the program control gear of each sampling channel of voltage sample device and current sampler；Built-in industrial control machine is connected with the power conversion controller of electric power conversion apparatus by controlling the coffret of parameter；This tester is without carrying out the troublesome operation such as too many field wiring, it is possible to easily tested excitation system is tested, simplifies test process.
For making above-mentioned purpose of the present utility model, feature and advantage to become apparent, preferred embodiment cited below particularly, and coordinate appended accompanying drawing, it is described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of this utility model embodiment, the accompanying drawing used required in embodiment will be briefly described below, it is to be understood that, the following drawings illustrate only some embodiment of the present utility model, therefore the restriction to scope it is not construed as, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other relevant accompanying drawings according to these accompanying drawings.
Fig. 1 illustrates the structural representation of a kind of excitation system static tester that this utility model embodiment provides；
Fig. 2 illustrates the global design figure of the another kind of excitation system static tester that this utility model embodiment provides；
Fig. 3 A illustrates the portable case front panel schematic diagram of the placement excitation system static tester that this utility model embodiment provides；
Fig. 3 B illustrates the portable cabinet rear board schematic diagram of the placement excitation system static tester that this utility model embodiment provides.
Detailed description of the invention
Below in conjunction with accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole embodiments.Generally can with various different configurations arrange and design with the assembly of this utility model embodiment that illustrate described in accompanying drawing herein.Therefore, below the detailed description of the embodiment of the present utility model provided in the accompanying drawings is not intended to limit claimed scope of the present utility model, but is merely representative of selected embodiment of the present utility model.Based on embodiment of the present utility model, the every other embodiment that those skilled in the art obtain under the premise not making creative work, broadly fall into the scope of this utility model protection.
Generator excited system is the important component part of synchronous generator, is a kind of automaton providing rotor DC excitation electric current to electromotor, and in generator system, it mainly has following two effects:
(1) Control of Voltage and Reactive load allocating
Under electromotor normal operation, automatic exciting regulator can regulate and maintain the set end voltage of electromotor, or the on high-tension side busbar voltage of booster transformer is in given level, the practical capacity according to electromotor, reasonable distribution load or burden without work between grid-connected electromotor.
(2) static state of system and the stability of operation are improved
Power system is in operation and is likely at any time be subject to various interference, cause the fluctuation of power system, even destroy stablizing of system, automatic exciting regulator can provide suitable adjustment of field excitation when power system is interfered, improve the stability of synchronous generator paired running, make power system set up new balance and steady statue, make the static state of power system and transient-stability limit be improved.
But, current excitation system static test substantially all adopt the equipment such as interim three phase mains, three-phase regulator, load resistance, oscillograph to build temporarily after test, in order to enable truly to identify the Trigger Angle of three-phase controllable silicon rectifier bridge, must be simultaneously introduced the pulsating dc voltage after the three-phase voltage of rectifier bridge AC and rectification during test, then determine the Trigger Angle of reality by the AC wave shape zero crossing the recorded time difference of upset point (changing acnode) with Rectified alternating current corrugating and the frequency of AC wave shape.This just requires that three-phase alternating current waveform should be the standard sine wave of frequency stable, preferably 50Hz, but the three-phase voltage at scene generally takes from wall power supply, namely normal domestic or industrial power supply, wave distortion is serious, frequency has fluctuation, the certainty of measurement of excitation system Trigger Angle is affected greatly, substantially cannot meet the requirement of accurately measurement.It addition, because when the accuracy of identification of Trigger Angle to be reached 0.1 °, it is desirable to picking rate necessarily be greater than 180kHz, and general oscillograph is substantially all unable to reach this minimum requirements.Simultaneously, pseudo-synchronous sampling mode is adopted owing to generally recording wave device, namely an A/D manages multiple signals, each channel signal before A/D samples through the switching control of analog multichannel switch, such acquisition rate is difficult to improve, and can not realize just really synchronizing, when the asynchronous time reaches 10 microsecond, the Trigger Angle error measured just is up to 0.2 °, still more now a lot of record wave devices due to A/D signal manage too much after, the interchannel maximum asynchronous time can reach 50 microseconds, the Trigger Angle error so measured just is up to about 1.0 °.The synchronicity generally recording wave device as can be seen here does not reach requirement.
In order to reduce the triviality of excitation system static test scene preparation and promote test accuracy, this utility model embodiment provides a kind of excitation system static tester, this tester is made up of power conversion module, the dummy resistance of model rotor, record ripple, display, storage and analysis and processing unit, it is achieved that the digitized of excitation system static test, lightweight, miniaturization, portability.The structural representation of the excitation system static tester that the present embodiment as shown in Figure 1 provides, comprising: electric power conversion apparatus 10, load resistance 50 and record ripple control device 20；
Electric power conversion apparatus 10 includes the input rectifying and filter circuit 11, DC/DC isolated variable loop 12, three-phase inversion loop 13 and the three-phase LC filter circuit 14 that are sequentially connected with and the power conversion controller 15 being connected respectively with input rectifying and filter circuit 11, DC/DC isolated variable loop 12, three-phase inversion loop 13 and three-phase LC filter circuit 14；
Record ripple controls device 20 and includes: voltage sample device 21, current sampler 22, logic controller 23, the built-in industrial control machine 24 being connected with logic controller 23, and the memorizer 25 being connected with built-in industrial control machine 24 and buffer 26.Wherein voltage sample device 21 and current sampler 22 include multi-channel sampling passage respectively, and every road sampling channel is provided with an A/D converter 27；Logic controller 23 controls the sampling gear of A/D converter 27, and controls the program control gear of each sampling channel of voltage sample device 21 and current sampler 22；As it is shown in figure 1, logic controller 23 is all connected with voltage sample device 21, current sampler 22 and A/D converter 27；A/D converter 27 is connected with buffer 26.
Built-in industrial control machine 24 is connected with the power conversion controller 15 of electric power conversion apparatus 10 by controlling the coffret of parameter；
Power conversion controller 15, by adjusting the Trigger Angle of input rectifying and filter circuit 11, controls the voltage magnitude of electric power conversion apparatus 10 output；Power conversion controller 15 is additionally operable to three-phase inversion loop 13 is carried out over-current detection and protection, and three-phase LC filter circuit 14 carries out output voltage and output electric current measurement；
Three-phase LC filter circuit 14 is connected with tested excitation system 30, and tested excitation system 30 is connected with load resistance 50 by three-phase commutation bridge 40；Three-phase commutation bridge 40 is sampled by voltage sample device 21 and current sampler 22 with the voltage and current on load resistance 50 connecting path.Wherein, load resistance 50 can be aluminum resistance.Logic controller 23 can be FPGA (field programmable gate array).
The excitation system static tester that the present embodiment provides is applicable to the exciter control system (can also referred to as excitation system) of various models, rectifier cabinet, it is possible to exciter control system carries out complete detection and the quick location of fault.
Above-mentioned excitation system static tester is easy to operate, safe and reliable, functional, easy to maintenance, can the phase place in synchronizing signal loop of complete detection excitation system and phase sequence, pluse output circuit wiring, the scope of pilot angle, fully controlled bridge trigger circuit and major loop working condition, further ensure that the operation reliable, safe and stable of excitation system.
The fault measuring the hardware-in-the-loops such as loop, synchronizing signal loop, pulse circuit, control machines loop of excitation system is the typical fault of generator excited system; use above-mentioned excitation system static tester that the time of electromotor accidental shutdown to excitation system fault fast positioning, can be shortened.Which obviate the tedious work that on-the-spot test prepares, be greatly saved the time of excitation system static test, improve the security reliability of on-the-spot test connection, reduce further the labor intensity of testing crew.
In order to ensure, between single-phase input power and output three phase mains, there is isolation features, and ensure that three-phase output voltage can reach higher output valve, the last every booster transformer that all must have a power frequency mutually of output part, but Industrial Frequency Transformer is excessively heavy, it is impossible to realize miniaturization and the lightweight of instrument.The present embodiment is provided with DC/DC isolated variable circuit 12 in electric power conversion apparatus 10, can without adopting overweight Industrial Frequency Transformer, but adopt high frequency transformer to use with boosting as isolation, the volume of high frequency transformer and weight only have about the 5%～10% of same capacity Industrial Frequency Transformer, it is possible to save space greatly, reduce weight.Based on this, above-mentioned DC/DC isolated variable loop 12 preferably employs high frequency transformer and realizes.
For ensureing the simple of circuit design and control, input rectifying and filter circuit 11 adopt controlled fullwave rectification bridge to realize.Specifically, the fullwave rectification bridge of the present embodiment can be controlled power supply, phase detecting circuit, phase-shift circuit by synchronizing signal transformator, isolation, Phototube Coupling triggers and output controllable silicon is integrated, for instance: integrated DTY220H35F isolates single phase ac regulation module entirely.
Work for the ease of above-mentioned high frequency transformer, will not cause the saturated of high frequency transformer because of the change of dutycycle, the DC/DC isolated variable loop 12 of the present embodiment includes: single-phase inversion loop, high frequency transformer, commutating circuit and the LC filter circuit being sequentially connected.Single-phase inversion (copped wave) loop in this loop can be designed as dutycycle and is fixed as the bipolar square wave way of output of 50%, and frequency of oscillation is 50kHz.
Three-phase sine-wave for outputting standard, the Three Phase SPWM Wave that three-phase inversion loop is exported by the present embodiment is filtered, namely have employed above-mentioned three-phase LC wave filter 14, for alleviating the weight of equipment, inductance in three-phase LC filter circuit 14 adopts the ferrum nickel powder core magnetic coil inductor of high magnetic flux rate, and electric capacity adopts noninductive CBB electric capacity.
Built-in industrial control machine 24 also includes the Ethernet interface being connected with extraneous upper monitoring machine.
For the ease of carrying, above-mentioned electric power conversion apparatus 10 and record ripple control device 20 and can be arranged at respectively in top box and the nowel of portable cabinet.
In order to understand above-mentioned tester more intuitively, present embodiments provide the global design figure of the excitation system static tester shown in Fig. 2, as shown in Figure 2, the design of this tester has been broadly divided into power conversion part, record ripple control part, load resistance part, wherein, power conversion part is equivalent to the electric power conversion apparatus 10 shown in above-mentioned Fig. 1, and record ripple control part is equivalent to the record ripple shown in above-mentioned Fig. 1 and controls device 20.In design, this tester have employed the hardware designs theory that some are relatively advanced, as have employed the single phase ac of the higher single-phase AC/DC/DC/ three-phase AC of power density to three-phase alternating current conversion regime, namely the efficient power frequency supply transformation system (i.e. three-phase inversion loop in Fig. 2 and three-phase LC filter circuit) of controlled fullwave rectification and filter circuit → DC/DC isolated variable loop and filter circuit → three-phase alternating current inversion, decreases volume and the weight of power conversion part；Adopt the aluminum resistance that thermal capacitance is actively high, decrease volume and the weight of fictitious load resistance；Adopt the PC104 built-in industrial control machine of high-performance micro as core controller, the high-capacity industrial level solid state hard disc of built-in 128GB is as data storage (being equivalent to the memorizer 25 in above-mentioned Fig. 1), the dynamic ram of built-in 2GB is as internal memory RAM (being equivalent to the buffer 26 in above-mentioned Fig. 1), adopt extensive programmable logic controller (PLC) FPGA as the logic controller of A/D converter and the program control gear of each input channel, adopt the method for every passage one high-speed a/d of configuration to realize the high speed synchronous sample of whole passage；The method that noninductive divider resistance and noninductive diverter coordinate with isolated amplifier is adopted to realize extremely wide frequency response characteristic；The method that program control stepping coordinates with overvoltage protection is adopted to realize the high-precision security measurement of wide scope.Various piece below for Fig. 2 is described respectively
1, power conversion part
Power conversion part input is AC single phase 220V, is output as AC three-phase 0～200V.This part is made up of controlled fullwave rectification and filter circuit (can also be called input rectifying and filter circuit), DC/DC isolated variable loop and filter circuit, three-phase inversion loop, three-phase LC filter circuit and power conversion controller five part, for ensureing the simple of circuit design and control, the Trigger Angle by controlling controlled fullwave rectification that controls of output voltage amplitude realizes, without adopting the method controlling three phase inverter bridge.Here without adopting simple AC/DC/AC power conversion loop, when being primarily due to adopt AC/DC/AC conversion, in order to ensure, between single-phase input power and output three phase mains, there is isolation features, and ensure that three-phase output voltage can reach higher output valve, the last every booster transformer that all must have a power frequency mutually of output part, but Industrial Frequency Transformer is excessively heavy, it is impossible to realize miniaturization and the lightweight of instrument.One-level DC/DC conversion is added in centre, it is possible to adopting high frequency transformer as isolation and boosting use, the volume of high frequency transformer and weight only have about the 5%～10% of same capacity Industrial Frequency Transformer, it is possible to save space greatly, reduce weight.
1.1, input rectifying and filter circuit
Input rectifying and filter circuit adopt controlled fullwave rectification bridge that the alternating current 220V power supply of input carries out rectification, then are filtered with LC filter circuit and obtain the less DC source of ripple.By the control of fully controlled bridge being exported the DC source of 0～200V.
For simplifying design, input rectifying and filter circuit in this device have employed integrated DTY220H35F and entirely isolate single phase ac regulation module, DTY220H35F is the high integration module integrating synchronizing signal transformator, isolation control power supply, phase detecting circuit, phase-shift circuit, Phototube Coupling triggering and output controllable silicon, effectively achieving the isolation of control circuit and high-tension circuit, control signal adopts DC voltage input.This module uses simple, the potentiometer that control signal can be controlled equipment output supply or the self-powered external 2～10K of direct module by other, can be achieved with regulating thyristor operating angle between 0～180 °, reaches to regulate the purpose of output voltage.Which greatly simplifies the design in full-controlled rectifier loop.LC filter circuit adopts compared with the inductance of low capacity and jumbo electrochemical capacitor, and inductance parameters takes 1 microhenry, 15A, and electrochemical capacitor parameter takes 300V, 4700 microfarads.
1.2, DC/DC isolated variable loop and filter circuit
DC/DC isolated variable loop and filter circuit are made up of single-phase inversion (copped wave) loop, high frequency transformer, rectification and LC filter circuit.
Single-phase inversion (copped wave) loop design in this loop is the bipolar square wave way of output that dutycycle is fixed as 50%, frequency of oscillation is 50kHz, so be conducive to the work of high frequency transformer, the saturation problem of high frequency transformer will not be caused because of the change of dutycycle.The no-load voltage ratio of high frequency transformer is designed as 200V:300V, and power designs is 2.5KVA, and commutating circuit adopts high speed diode all wave rectification, and LC filter circuit adopts the electrochemical capacitor of 1 microhenry, the inductance of 10A and 600V, 4400 microfarads.
1.3, three-phase inversion loop
Three-phase inversion loop can adopt subminiature Rhizoma Sparganii the 6th generation DIPIPM module PSS35SA2FT; the ASIC that module is built-in completely newly realizes driving and protection; EMI is reduced by control gate di/dt; integrated temperature sensor on IGBT silicon chip; overheat protector is more accurately (145 DEG C); main terminal has stitch type and two kinds of forms of screw-type, and electric current is 35A, electric pressure: 1200V.Adopt this module not only volume little; and can directly and the interface of microcontroller; the design can be directly connected to the PWM output pin of master controller DSP2407A, it is not necessary to extra drive circuit and protective loop, enormously simplify circuit, save space, decrease weight.
1.4, three-phase LC filter circuit
Three-phase sine-wave for outputting standard, need the Three Phase SPWM Wave of three-phase inverter output is filtered, the design adopts three-phase LC wave filter, for alleviating the weight of equipment, inductance adopts ferrum nickel powder core (KH series) magnetic coil inductor of high magnetic flux rate, and inductance value is 2 microhenrys.The metal dust magnetic core that ferrum nickel powder core is made up of the alloy powder of 50%Fe and 50%Ni, also referred to as high magnetic flux powder core, in all of dusty material, ferrum nickel powder core has the DC of optimum and biases ability, high saturation magnetic flux density (15000 Gauss) and low core loss height energy storage characteristic, it is highly suitable for the application of direct current biasing high-power, big, such as light modulation inducer, kickback transformer, returns number correction inducers etc. at line noise filter, pulse transformer and power.
Electric capacity adopts noninductive CBB electric capacity, and parameter is voltage 630V, capacitance 6.8 microfarad.
1.5, power conversion controller
nullPower conversion controller adopts High Performance DSP 2407A single-chip microcomputer，6 road three-phase PWM control signal outputs it are integrated with in DSP2407A single chip microcomputer、3 independent pwm control signal outputs、12 high-speed a/d input pins、Several I/O interface、One RS232 interface、And ROM、ROM controls the abundant interfaces such as bus，In the design, 6 road three-phase PWM control signal outputs are for the control signal of six IGBT in three-phase inversion loop，The output of one pwm control signal and reverse signal are used for single-phase inversion (copped wave) loop in DC/DC isolated variable loop，3 high-speed a/d pins are used for measuring three-phase output voltage，RS232 interface controls part with record ripple and is connected，For receiving record ripple control part, the output voltage of power conversion part is arranged.
2, record ripple controls part
Record ripple controls part by a block power supply plug-in unit (not illustrating in Fig. 2), one block of intelligent acquisition plug-in unit (PC104 built-in industrial control machine in Fig. 2, logic controller, 8 road high-speed a/ds, each interface, solid state hard disc and internal memory RAM), one piece of voltage signal input processing plug-in unit (4 channel voltage input card in Fig. 2, be called for short voltage plug-in unit), one block of current signal input processing plug-in unit (4 channel current input cards in Fig. 2 are called for short electric current plug-in unit) composition.
2.1, intelligent acquisition plug-in unit
Intelligent acquisition plug-in unit in the present embodiment is by miniature high-performance fan-free low-power consumption PC104 built-in industrial control machine, 8 picking rates reach 16 A/D chip of high speed (i.e. 8 tunnel A/D chip in figure) of 450kHz, 2 extensive programmable logic controller (PLC) FPGA, some EingangsAusgangsSchnittstelles, 2GB solid state hard disc, 1GB memory bar (i.e. internal memory RAM in figure) forms, PC104 built-in industrial control machine adopts and grinds China M3362, basic configuration is CPU frequency 1.6GHz, it is with 4 USB interface, 1 10M/100M/1000M self adaptation Ethernet interface, 2 RS485/422 interfaces, 2 RS232 interfaces, one video interface.
Intelligent acquisition plug-in unit is the core of record ripple control part, each voltage, current signal process plug-in unit and by the control of intelligent acquisition plug-in unit and give intelligent acquisition plug-in unit by the signal each handled well by chassis, each signal is converted to digital signal by the A/D of intelligent acquisition plug-in unit, and is recorded and preservation.All 8 A/D chips of intelligent acquisition plug-in unit are controlled by same signal, and Complete Synchronization collection, synchronous acquisition frequency is up to every passage 409.6kHz.
Intelligent acquisition plug-in unit can pass through Ethernet and couple with background monitoring, it is possible to what accept to send under background monitoring various arranges parameter, uploads all recorder datas, passes through RS232 interface simultaneously and be connected with power conversion part, issue the output voltage desired value of setting.
2.2, power insert
Power insert provides various accessory power supplys to each plug-in unit of instrument, the 220V Power convert of input is become direct current 5V by this plug-in unit, ± 12V, tri-groups of power supplys of 24V, wherein 5V and ± 12V power supply are altogether, 5V power supply mainly supplies intelligent acquisition plug-in unit, voltage signal processes plug-in unit and current signal processes the digital circuit of plug-in unit (such as CPU, FPGA, the digital circuit chips such as GAL) use, ± 12V power supply mainly supplies voltage signal and processes the analog circuit chip of plug-in unit and current signal process plug-in unit (such as amplifier, comparator etc.) analog circuit use, 24V is independent insulating power supply, entry loop is opened in main supply, output and loop, the control relay of miniature DC/DC insulating power supply and inside uses.
2.3, voltage signal input processing plug-in unit (i.e. 4 channel voltage input cards in Fig. 2)
Voltage signal is accessed and be processed to (blood pressure lowering) by voltage signal input processing plug-in unit isolates by isolated amplifier, converts the signal into the receptible standard signal of A/D then through amplifying return circuit.Each plug-in unit arranges 4 road voltage input channels, and each input channel has 2 grades of (DC400V, DC200V) program-controlled ranges, to adapt to different size of input signal.Each input signal circuit is also devised with overvoltage protection and off-limit alarm loop, to avoid burning instrument because signal wrong or gear select improper.For obtaining wider response band, all input channels all adopt the isolated amplifier part that can truly reflect direct current and transient state higher hamonic wave.
2.4, current signal input processing plug-in unit (i.e. 4 channel current input cards in Fig. 2)
Current signal is accessed and be processed to (shunting) by current signal input processing plug-in unit isolates by isolated amplifier, converts the signal into the receptible standard signal of A/D then through amplifying return circuit.Each plug-in unit arranges 4 road electric current input channels, and each input channel has 2 grades of (DC14V, DC2.8V) program-controlled ranges, to adapt to different size of input signal.Each input signal circuit is also devised with overcurrent protection and off-limit alarm loop, to avoid burning instrument because signal wrong or gear select improper.For obtaining wider response band, all input channels all adopt the isolated amplifier part that can truly reflect direct current and transient state higher hamonic wave.
Additionally, excitation system static tester shown in Fig. 2 further comprises fictitious load active component, in the present embodiment, fictitious load active component adopts the aluminum resistance of high heat capacity, internal 300 ohmages being provided with 6 300W altogether, every 2 resistor coupled in parallel use as 150 ohmages of one group of 600W, and each group of resistance has terminal one group corresponding, each can using in parallel or series in outside, all during parallel connection, resistance is 50 ohm.Burn for preventing resistance from may cross stream, the self-recoverage protective tube of each resistance has been connected 250V, a 1A, protection fictitious load resistance that so can be fabulous.
Simultaneously, above-mentioned excitation system static tester has been carried out overall construction design by the present embodiment, the portable cabinet (as shown in Fig. 3 A, 3B) of employing standard 6U height, cabinet is divided into two parts composition of each 3U height up and down, lower half is power conversion part, and upper half controls and fictitious load part for record ripple.The function of various piece is completed by the button on the control panel of cabinet shown in Fig. 3 A and Fig. 3 B.Fictitious load resistance is made up of 600 watts of aluminum resistance of three groups 150 ohm, and record ripple controls part and is made up of a block power supply plug-in unit, one piece of intelligent acquisition plug-in unit, one piece of voltage signal input processing plug-in unit (the voltage plug-in unit in Fig. 3 B), one piece of current signal input processing plug-in unit (the electric current plug-in unit in Fig. 3 B).Record ripple control part can arrange the output voltage amplitude of power conversion part by RS232 interface.
The output of above-mentioned excitation system static tester adopts three-phase inversion loop and three-phase LC filter circuit, and output three phase AC sine wave aberration rate controls within 2%, alleviates the problem that the distortion of normal domestic power supply wave shape is serious.Three phase inverter bridge can adopt subminiature Rhizoma Sparganii the 6th generation DIPIPM module PSS35SA2FT (intelligence IGBT module), and three-phase inversion loop adopts SPWM control mode, and switching frequency adopts 10kHz.The inductance of three-phase LC filter circuit adopts ferrum nickel powder core (KH series) magnetic coil inductor of high magnetic flux rate, and electric capacity adopts noninductive CBB electric capacity.
Above-mentioned Fig. 2 excitation system static tester introduce synchronized sampling mechanism alleviate existing wave recording device gather signal speed too low and gather asynchronous problem.It is embodied in Fig. 2 each sampling channel and all configures an A/D, and the A/D conversion command of all passages is from same command signal, it is ensured that all A/D are activated conversion simultaneously, it is achieved thereby that synchronous acquisition function.Again owing to adopting one A/D of every passage, change successively after being no longer necessary to give A/D respectively by multiway analog switch successively by different channel signals, greatly improve the frequency of each passage D/A conversion, ensure that single channel keeps consistent with multichannel acquisition rate, and the speed that Channel Synchronous is sampled can be made to reach the high speed acquisition of 400kHz, so can improve the temporal resolution of sampling gained waveform greatly, thus improving the certainty of measurement of excitation system delay angle.
Above-mentioned excitation system static tester adopt AC/DC/DC/AC mapping mode realize power conversion part electrically every with lightweight, solve the problem that power conversion part is excessively heavy, principle is as follows:
Above-mentioned power conversion part is made up of input rectifying and filter circuit, DC/DC isolated variable loop, three-phase inversion loop, three-phase LC filter circuit and power conversion controller five part, for ensureing the simple of circuit design and control, the Trigger Angle by controlling controlled fullwave rectification that controls of output voltage amplitude realizes, without adopting the method controlling three phase inverter bridge.Here without adopting simple AC/DC/AC power conversion loop, when being primarily due to adopt AC/DC/AC conversion, in order to ensure, between single-phase input power and output three phase mains, there is isolation features, and ensure that three-phase output voltage can reach higher output valve, the last every booster transformer that all must have a power frequency mutually of output part, but Industrial Frequency Transformer is excessively heavy, it is impossible to realize miniaturization and the lightweight of instrument.One-level DC/DC conversion is added in centre, it is possible to adopting high frequency transformer as isolation and boosting use, the volume of high frequency transformer and weight only have about the 5%～10% of same capacity Industrial Frequency Transformer, it is possible to save space greatly, reduce weight.
A/D converter in above example is a kind of components and parts that analog quantity converts to digital quantity；Program control point of gear refers to that record wave device can be divided into, with the measurement range of a pair input port, the several gears varied in size, and specifically used range can be controlled by program.
Above-mentioned synchronous acquisition refers to that each input signal adopts an A/D converter in signals collecting, and the startup conversion command of all A/D converters is same signal, so ensures all collected conversions of signal synchronization.
The excitation system static tester that above-described embodiment provides is applicable to exciter control system (such as the above-mentioned generator excited system) static test of various models, it is also applied for the static characteristic test of rectifier cabinet, can the phase place in complete detection excitation system synchronizing signal loop and phase sequence, pluse output circuit wiring, the scope of pilot angle, fully controlled bridge trigger circuit and major loop working condition, quickly location excitation system fault, further ensures that safe and reliable, the stable operation of excitation system.Application excitation system static tester can be avoided the tedious work that the test of excitation system static test scene prepares, and is greatly saved the time of test, improves the security reliability of on-the-spot test connection, reduce further the labor intensity of testing crew.
As shown in the above, the excitation system static tester of the present embodiment achieves following technique effect:
(1) this instrument can the phase place in complete detection excitation system synchronizing signal loop and phase sequence, pluse output circuit wiring, the scope of pilot angle, fully controlled bridge trigger circuit and major loop working condition, quickly location excitation system fault, further ensures that safe and reliable, the stable operation of excitation system.
(2) excitation system static test wiring is solved loaded down with trivial details, the problem of test inconvenience.
Current excitation system is required for before putting into operation first carrying out static test, three-phase alternating-current supply is provided it is generally required to on-the-spot, three-phase regulator, high-power fictitious load, high speed wave recording device, so many devices are put together and excitation system are tested, need extremely complex wiring, workload is quite big, this device is by power conversion module, the dummy resistance of model rotor, record ripple, display, storage and analysis and processing unit are all integrated in the intelligent instrument of a miniaturization, as long as providing conventional single phase poaer supply during on-the-spot test, greatly simplify the wiring of the tedious work of excitation system static test testing ground preparation and test, it is greatly saved the time of test, improve the security reliability of on-the-spot test connection, reduce further the labor intensity of testing crew.
(3) on-site signal distortion is alleviated serious, the problem being unfavorable for measuring controllable silicon rectifying bridge delay angle.
(4) general wave recording device picking rate is alleviated too low and gather the error problem measuring controllable silicon rectifying bridge delay angle that asynchronous problem causes.
(5) adopt AC/DC/DC/AC mapping mode realize power conversion part electrically every with lightweight, alleviate the problem that power conversion part is excessively heavy.
The above; it is only detailed description of the invention of the present utility model; but protection domain of the present utility model is not limited thereto; any those familiar with the art is in the technical scope that this utility model discloses; change can be readily occurred in or replace, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should described be as the criterion with scope of the claims.
Claims (10)
1. an excitation system static tester, it is characterised in that including: electric power conversion apparatus, load resistance and record ripple control device；
Described electric power conversion apparatus includes the input rectifying and filter circuit, DC/DC isolated variable loop, three-phase inversion loop and the three-phase LC filter circuit that are sequentially connected with and the power conversion controller being connected respectively with described input rectifying and filter circuit, described DC/DC isolated variable loop, described three-phase inversion loop and described three-phase LC filter circuit；
Described record ripple controls device and includes: voltage sample device, current sampler, logic controller, the built-in industrial control machine being connected with described logic controller, and the memorizer being connected with described built-in industrial control machine and buffer, wherein said voltage sample device and described current sampler include multi-channel sampling passage respectively, and every road sampling channel is provided with an A/D converter；Described logic controller controls the sampling gear of described A/D converter, and controls the program control gear of each sampling channel of described voltage sample device and described current sampler；
Described built-in industrial control machine is connected with the described power conversion controller of described electric power conversion apparatus by controlling the coffret of parameter；
Described power conversion controller, by adjusting the Trigger Angle of described input rectifying and filter circuit, controls the voltage magnitude of described electric power conversion apparatus output；Described power conversion controller is additionally operable to described three-phase inversion loop is carried out over-current detection and protection, and described three-phase LC filter circuit carries out output voltage and output electric current measurement；
Described three-phase LC filter circuit is connected with tested excitation system, and described tested excitation system is connected with described load resistance by three-phase commutation bridge；Described three-phase commutation bridge is sampled by described voltage sample device and described current sampler with the voltage and current on described load resistance connecting path.
2. excitation system static tester according to claim 1, it is characterised in that described DC/DC isolated variable loop adopts high frequency transformer to realize.
3. excitation system static tester according to claim 1, it is characterised in that described input rectifying and filter circuit adopt controlled fullwave rectification bridge to realize.
4. excitation system static tester according to claim 3, it is characterised in that described fullwave rectification bridge is controlled power supply, phase detecting circuit, phase-shift circuit by synchronizing signal transformator, isolation, Phototube Coupling triggers and output controllable silicon is integrated.
5. excitation system static tester according to claim 1, it is characterised in that described DC/DC isolated variable loop includes: single-phase inversion loop, high frequency transformer, commutating circuit and the LC filter circuit being sequentially connected.
6. excitation system static tester according to claim 1, it is characterised in that the inductance in described three-phase LC filter circuit adopts the ferrum nickel powder core magnetic coil inductor of high magnetic flux rate, electric capacity adopts noninductive CBB electric capacity.
7. excitation system static tester according to claim 1, it is characterised in that described load resistance is aluminum resistance.
8. excitation system static tester according to claim 1, it is characterised in that described built-in industrial control machine also includes the Ethernet interface being connected with extraneous upper monitoring machine.
9. excitation system static tester according to claim 1, it is characterised in that described logic controller is on-site programmable gate array FPGA.
10. excitation system static tester according to claim 1, it is characterised in that described electric power conversion apparatus is arranged in the nowel of portable cabinet, described record ripple controls device and described load resistance is arranged in the top box of described portable cabinet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620020031.8U CN205374691U (en) | 2016-01-08 | 2016-01-08 | Excitation system static test appearance |
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| CN201620020031.8U CN205374691U (en) | 2016-01-08 | 2016-01-08 | Excitation system static test appearance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107450021A (en) * | 2017-06-27 | 2017-12-08 | 上海电机***节能工程技术研究中心有限公司 | A kind of multipurpose test system for motor test |
| CN115360947A (en) * | 2022-08-31 | 2022-11-18 | 中国长江三峡集团有限公司 | Excitation circuit, excitation small current test method and electronic equipment |
-
2016
- 2016-01-08 CN CN201620020031.8U patent/CN205374691U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107450021A (en) * | 2017-06-27 | 2017-12-08 | 上海电机***节能工程技术研究中心有限公司 | A kind of multipurpose test system for motor test |
| CN115360947A (en) * | 2022-08-31 | 2022-11-18 | 中国长江三峡集团有限公司 | Excitation circuit, excitation small current test method and electronic equipment |
| CN115360947B (en) * | 2022-08-31 | 2023-07-25 | 中国长江三峡集团有限公司 | Excitation circuit, excitation small current test method and electronic equipment |
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