CN107422212A - A kind of electronic direct current transformer transient characterisitics experimental rig and control method - Google Patents
A kind of electronic direct current transformer transient characterisitics experimental rig and control method Download PDFInfo
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- CN107422212A CN107422212A CN201710730478.3A CN201710730478A CN107422212A CN 107422212 A CN107422212 A CN 107422212A CN 201710730478 A CN201710730478 A CN 201710730478A CN 107422212 A CN107422212 A CN 107422212A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a kind of electronic direct current transformer transient characterisitics experimental rig and control method, including square wave power system, synthesis loop control system, stacked switch, detection means.Square wave power system includes direct current steepness power supply, steepness power compensation device and controlled power of direct current；Synthesis loop control system is used for the waveform reference of three power supplys of calculating and synthesis sequential is handed down to each supply unit, and three power supplys of control synthesize according to given route and sequential, obtain controlled current waveform；Direct current steepness power supply, steepness power compensation device are used for the class index current waveform for producing steepness；Controlled power of direct current is used for the compensation of square wave current；Stacked switch is used for the duration for controlling load current；Detection means is used to detect direct current square wave current, and record tests process data and returns to synthesis loop control system.The present invention has that output current is big, response is fast, accurate height, easy-to-connect, controls the advantages of simple.
Description
Technical field
The present invention relates to transformer detection technique field, more specifically to a kind of electronic direct current transformer transient state
Characteristic test apparatus and control method.
Background technology
Technology of HVDC based Voltage Source Converter be using voltage source converter (VSC), turn-off device and pulsewidth modulation (PWM) technology as
The HVDC Transmission Technology of new generation on basis, interconnected, on a large scale in island with power, the capacity-increasing transformation of urban power distribution network, AC system
Wind farm grid-connected aspect has stronger technical advantage, compensate for the limitation of Traditional DC transmission of electricity.State Grid Corporation of China is
Put into operation a plurality of flexible direct current power transmission systems such as Zhoushan ± 200kV, Xiamen ± 320kV, is building Zhangbei County ± 500kV, Chongqing Hubei Province
Flexible direct current engineering is waited back-to-back.Relative to conventional high-tension DC transmission system, the ability of regulation and control of flexible direct current power transmission system is more
By force, impedance loop during but due to flexible direct current power transmission system DC side failure is very small, easily very big in instantaneous generation
Fault current, so in order to improve the response speed of flexible direct current system, suppress fault current, the safety for improving power system is steady
It is qualitative, it is necessary to control protection signal that there is faster sample rate and broader frequency bandwidth, this is to flexible DC power transmission with straight
The transient characterisitics of current transformer propose higher requirement.
In the national standard of correlation, the transient characterisitics and experiment of direct current instrument transformer are provided.National standard
GB/T 26216.1-2010《HVDC transmission system direct current measuring devices part 1：Electronic direct-current current measurement
Device》The step response rise time of middle clear stipulaties electronic direct-current current measuring device should be less than 400us.Flexible direct current is defeated
Direct current instrument transformer transient performance in electric system requires higher, and the step response rise time should be less than 120us.As flexible direct current
The current temporary state response measurement system of transmission system direct current instrument transformer, the square wave current generating means step response in system rise
Time than transformer step response rise time in itself should also small an order of magnitude again, just can ensure that the accuracy of measurement, i.e.,
The square wave current generating means output current step response rise time should reach 10us magnitudes, and pulsewidth need to be more than 5ms, output
Current peak requirement reaches 3000A, but lacks corresponding detection device at present, causes the transient characterisitics of direct current instrument transformer to test nothing
Method is normally carried out.
The content of the invention
The technical problem to be solved in the present invention is, there is provided a kind of electronic direct current transformer transient characterisitics experimental rig and
Control method.
The technical solution adopted for the present invention to solve the technical problems is：It is special to construct a kind of electronic direct current transformer transient state
Property experimental rig, including synthesis loop control system, square wave power system, stacked switch, detection means, the square wave power system
System includes direct current steepness power supply, steepness power compensation device and controlled power of direct current, the synthesis loop control system and direct current
Three sets of steepness power supply, steepness power compensation device, controlled power of direct current power supplys are rectified by network interface connection, the output of three sets of power supplys
Negative level is connected in parallel respectively；The synthesis loop control system be used to first calculating direct current steepness power supply, steepness power compensation device,
The respective waveform reference of direct current controllable current source and synthesis sequential are handed down to each supply unit again, control direct current steepness power supply,
Steepness power compensation device, controlled power of direct current are according to given route again by the controlled current waveform of synthesis sequential export；It is described
Direct current steepness power supply, steepness power compensation device are used for the class index current waveform for producing steepness；The controlled power of direct current is used
In the compensation for carrying out square wave current；The stacked switch is used for the duration for controlling load current；The detection means is used for
Direct current square wave current is detected, and record tests process data and returns to the synthesis loop control system.
In such scheme, the synthesis loop control system includes square wave current detection means, communicator and upper
Machine control system.Synthesis loop control system possesses error and correction algorithm disposal ability.
In such scheme, the controlled power of direct current includes rectified three-phase circuit, DC/AC high-frequency inverter circuits, high frequency
Rectification circuit, output filter circuit and control protection electric circuit composition.Controlled power of direct current is operated in constant current mode, produces compensation
Electric current and stable High-current output.
In such scheme, the stacked switch is made up of IGBT parallel connections group and its drive circuit, the synthesis loop control
System processed adjusts the duration of load current by the line vias of changing-over combined switching, and being kept switched off speed, to reach 10 micro-
Within second.
In such scheme, the direct current steepness power supply is by high frequency voltage pulse power supply, commutator, storage capacitor, continuous
Diode and controllable impedance composition are flowed, hundred Microsecond grade class index current waveforms can be produced.The circuit knot of steepness power compensation device
Structure is similar to direct current steepness power supply, but internal capacitance and inductance value are relatively small, can produce Microsecond grade class index current waveform.
The present invention also provides a kind of control method of electronic direct current transformer transient characterisitics experimental rig, including following step
Suddenly：
Step S010, the synthesis loop control system receive TD and index request, calculate required synthesis
When current waveform, direct current steepness power supply amplitude and rise and fall time constant, steepness power compensation device amplitude and rise and fall
Between constant, the reference waveform curve of controlled power of direct current, and be handed down to each supply unit；
Step S020, the direct current steepness power supply receive control instruction, and loading test parameter is simultaneously standby；
Step S030, the direct current steepness power compensation device receive control instruction, and loading test parameter is simultaneously standby；
Step S040, the controlled power of direct current receive waveform datum curve and completed, and start, according to the path of datum curve
Follow waveform and export；
Step S050, the controlled power of direct current start direct current steepness power supply, the direct current steepness in first timing point
Electric power outputting current；
Step S060, the controlled power of direct current starts direct current steepness power compensation device in second timing point, described
Direct current steepness electric power outputting current；
Step S070, the direct current steepness power supply, steepness power compensation device, the output current of controlled power of direct current are defeated
Go out and Waveform composition completed on circuit, disturbed by circuit stray capacitance inductance parameters, produce a current waveform for being similar to square wave,
Distortion be present in the current wave part shape；
Step S080, first round experiment are completed, and the synthesis loop control system completes recording, and by recording waveform with trying
Required comparison of wave shape is tested, calculates both waveform errors, the ripple of controlled power of direct current will be added to after error calculation processing
In shape benchmark, the benchmark is allowed to produce a reverse error compensation amount；
Step S090, repeat the above steps 1~3 time, until output current is consistent with target current waveform, with now each
Control program of the control parameter and datum curve of supply unit as the testing site.
In the present invention, synthesis loop control system passes through the calculating to current waveform, control controlled power of direct current, direct current
Steepness power supply and steepness power compensation device produce respective optimal magnitude and the current waveform of rising and time constant of fall, three tunnels
The waveform of power supply completes the synthesis of waveform by accurate time cooperation.But the waveform now synthesized is due to spuious by circuit
Inductance, electric capacity and magnetic interference can produce larger wave distortion, and the current waveform of the distortion can in post synthesis, device after testing
Feed back to synthesis loop control system, synthesis loop control system again by the calculating to target current and distortion current error,
New waveform reference is handed down to controlled power of direct current, makes it to error Contrary compensation.Operated more than repeating, second of synthesis
Current waveform can be improved because of the amendment of the output waveform of controlled power of direct current.By multiple amendment, obtain preferably
Resultant current waveform.
The present invention utilizes the different output characteristics of controlled power of direct current, direct current steepness power supply and steepness power compensation device,
Synthesize preferable electric current.Controlled power of direct current is because its stability is high, and waveform is steady, governing speed is slower, and electric current, which rises, to be taken
Between it is very big；During direct current steepness electric power outputting current, the time constant of raising and lowering is larger, but it is very fast and unsustainable to decay；
Steepness power compensation device can produce the rate of climb of ideal waveform, but decrease speed is exceedingly fast, is unsustainable.The present invention is by straight
Flow steepness power supply and its compensation device produce a steepness class index current waveform ensure electric current the rate of climb and it is lasting when
Between, recycle controlled power of direct current to carry out the compensation of square wave current, finally by controlled power of direct current, direct current steepness power supply and steepness
The electric current of power compensation device carries out synthesizing step square wave, and to provide, climbing speed is fast, steady retainable target current.
Implement a kind of electronic direct current transformer transient characterisitics experimental rig of the present invention and control method, have beneficial below
Effect：
1st, the present invention uses the combination of direct current steepness power supply, steepness power compensation device, controlled power of direct current, realizes direct current
The required electric current of the temporary steady-state response experiment of transformer is big, rising is fast, waveform is steady, lasting controllable square-wave waveform；
2nd, direct current steepness power supply of the invention, steepness power compensation device utilize the form of the additional compensation of capacitor charge and discharge,
Microsecond grade direct current step current caused power rush in the loop is reduced, can effectively reduce the volume and cost of equipment；
3rd, the building-up process of current waveform calculates completion, operation by the in house software of synthesis loop control system in the present invention
Convenient, control accuracy is higher, realizes the impossible accurate control of artificial test operation；
4th, the present invention in current waveform amendment, be by repetitive error amendment, Contrary compensation offset load and loop in
Parasitic parameter and electromagnetic change bring the distortion of current waveform, this method can greatly lifting system device anti-interference energy
Power, suitable for this occasion higher to line inductance, electric capacity, resistance parameter stability requirement of cranking test；
5th, the method for the invention for following to electric current baseline, quickly compensating can effectively avoid the overshoot to electric current output or owe
Adjust, meet direct current instrument transformer and detect this application scenario strict to current waveform requirement.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the principle signal of DC current transformer transient response measurement current generating apparatus in the embodiment of the present invention
Figure；
Fig. 2 is the circuit topology figure of direct current steepness power supply in the embodiment of the present invention；
Fig. 3 is the circuit topology figure of controlled power of direct current in the embodiment of the present invention；
Fig. 4 is the composition principle schematic diagram of square wave current in the embodiment of the present invention；
Fig. 5 is the Waveform composition schematic diagram of direct current steepness power supply and steepness power compensation device in the embodiment of the present invention；
Fig. 6 is the waveform of controlled power of direct current in the embodiment of the present invention, direct current steepness power supply and steepness power compensation device
Synthesize schematic diagram；
Fig. 7 is the Waveform composition schematic diagram of three power supplys in the embodiment of the present invention；
Embodiment
In order to which technical characteristic, purpose and the effect of the present invention is more clearly understood, now compares accompanying drawing and describe in detail
The embodiment of the present invention.
As shown in figure 1, the present invention provides a kind of electronic direct current transformer transient characterisitics experimental rig, including synthesis loop
Control system, square wave power system, stacked switch, detection means.
Square wave power system includes direct current steepness power supply, steepness power compensation device and controlled power of direct current.
Direct current steepness power supply, steepness power compensation device are used for the class index current waveform for producing steepness.Direct current steepness electricity
Source is made up of high frequency voltage pulse power supply, commutator, storage capacitor, fly-wheel diode and controllable impedance, in the present embodiment,
The circuit structure of direct current steepness power supply is as shown in Fig. 2 direct current steepness power supply includes high frequency high voltage capacitor charge power supply DY1, filled
Electric control switch K1, pulse power storage capacitor C1, highpowerpulse IGCT D1, sustained diode 2 and afterflow inductance L1 groups
Into charging control switch K1, highpowerpulse IGCT D1, afterflow inductance L1 are connected to DC capacitor charge power supply DY1 in turn
Positive terminal and ECT test products between, highpowerpulse IGCT D1 is connected to pulse power storage capacitor C1 and fly-wheel diode
Between D2 positive terminal.During the direct current steepness power work, storage capacitor C1 is given by high frequency high voltage capacitor charge power supply DY1
Charging, charge parameter are issued by synthesis loop control system, charging complete, cut-out electric capacity C1 and high-voltage capacitor charge power supply
Passage between DY1, switch is switched to load circuit when output is discharged, then triggers highpowerpulse IGCT D1, direct current is steep
Change power supply and just output the current waveform of specified current flow amplitude and time constant, the time constant of fall of output current wave can be with
It is finely adjusted by the value for adjusting controllable impedance L1.Steepness power compensation device has essentially identical knot with direct current steepness power supply
Structure, it is different only in the parameter of storage capacitor and outputting inductance, and parameter is smaller, the climbing speed for ensureing to compensate electric current with this.
Controlled power of direct current is used for the compensation for carrying out square wave current.Controlled power of direct current includes rectified three-phase circuit, DC/AC
High-frequency inverter circuit, high-frequency rectification circuit, output filter circuit and control protection electric circuit composition.In the present embodiment, direct current
The circuit structure of controllable electric power through electric capacity (C1~C4) as shown in figure 3, the rectified bridge of three-phase alternating voltage (D1~D4), filter again
After obtain DC voltage, obtained after full bridge inverter (by the road IGBT of Q1~Q4 tetra- switches, high frequency transformer T forms) conversion
High-frequency pulse voltage, then by obtaining required adjustable DC electric current after rectifier rectification and filter filtering.Controlled power of direct current
Controlled in control using hardware PI rings, output stability and governing speed are had higher requirements, ensure that it is bent in reference current
Line follow and error compensation function on have enough speed, then stable output has less ripple.
Synthesis loop control system includes square wave current detection means, communicator and upper computer control system.Synthesize back
Three sets of path control system and direct current steepness power supply, steepness power compensation device, controlled power of direct current power supplys are by network interface connection, and three
The positive and negative level of output end of set power supply is connected in parallel respectively, and the electric current of three sets of power supplys directly synthesizes on the line, synthetic effect signal
Figure is as shown in Figure 4.For first calculating direct current steepness power supply, steepness power compensation device, the respective waveform of direct current controllable current source
Benchmark and synthesis sequential are handed down to each supply unit again, and control direct current steepness power supply, steepness power compensation device, direct current are controllable
Power supply is according to given route again by the controlled current waveform of synthesis sequential export.
Detection means is used to detect direct current square wave current, and record tests process data and returns to synthesis loop control system
System.Stacked switch is made up of IGBT parallel connections group and its drive circuit, the line that synthesis loop control system passes through changing-over combined switching
Road path adjusts the duration of load current.
The present invention also provides a kind of control method of electronic direct current transformer transient characterisitics experimental rig, including following step
Suddenly：
Step S010, synthesis loop control system receive TD and index request, calculate required resultant current
Waveform, direct current steepness power supply amplitude and rise and fall time constant, steepness power compensation device amplitude and rise and fall time are normal
Number, the reference waveform curve of controlled power of direct current, and it is handed down to each supply unit；
Step S020, direct current steepness power supply receive control instruction, and loading test parameter is simultaneously standby；
Step S030, direct current steepness power compensation device receive control instruction, and loading test parameter is simultaneously standby；
Step S040, controlled power of direct current receive waveform datum curve and completed, and start, are followed according to the path of datum curve
Waveform simultaneously exports；
Step S050, controlled power of direct current start direct current steepness power supply, the output of direct current steepness power supply in first timing point
Electric current；
Step S060, controlled power of direct current start direct current steepness power compensation device, direct current steepness in second timing point
Electric power outputting current；
Step S070, direct current steepness power supply, steepness power compensation device, the output current of controlled power of direct current are in output line
Waveform composition is completed on road, is disturbed by circuit stray capacitance inductance parameters, produces a current waveform for being similar to square wave, the electricity
Flow ripple part shape and distortion be present；
Step S080, first round experiment are completed, and synthesis loop control system completes recording, and by recording waveform with testing institute
Comparison of wave shape is needed, calculates both waveform errors, the waveform base of controlled power of direct current will be added to after error calculation processing
In standard, the benchmark is allowed to produce a reverse error compensation amount；
Step S090, repeat the above steps 1~3 time, until output current is consistent with target current waveform, with now each
Control program of the control parameter and datum curve of supply unit as the testing site.
Current generating apparatus, direct current steepness power supply, controlled power of direct current with reference to shown in Fig. 1-3 in the present embodiment, other side
The building-up process of ripple current waveform is carried out as described in detail below, and the building-up process of square-wave current waveform comprises the following steps：
1) complete power sources in parallel wiring and system control wiring, control switchgroup 1 turn on.
2) direct current steepness power supply and the synthesis of direct current steepness power compensation device, after synthetic method is as shown in figure 5, synthesize, shape
Into a class index current waveform, the rate of climb of waveform is fast and decrease speed is relatively slow.
3) waveform of second step synthesis synthesizes with controlled power of direct current output current again, and synthetic method is as shown in fig. 6, synthesis
Afterwards, the current waveform of a fast continued smooth of the rate of climb is formed.
4) resultant current is allowed to reach the duration after flowing through load in testing, timing turns off stacked switch 1, and connects combination
Switch 2, allows electric current to be quickly transferred to bypass, and cut-out load is haveed the function that in effect.
5) square wave current tentatively synthesizes, and square wave current detection means completes recording.
6) after recording, square wave current synthetic waveform, i.e. controlled power of direct current, direct current steepness power supply and direct current steepness electricity are obtained
Synthetic waveform caused by the compensation device of source.It can be found that said process completion electric current synthetic waveform effect is unsatisfactory, it is necessary to right
Existing waveform is modified, and modification method is as shown in Figure 7.For the synthetically produced error of direct current steepness power supply and its compensation device
Waveform on direct current controllable current source, it is necessary to produce a Contrary compensation amount, for error caused by controlled power of direct current itself,
Also identical method is used, resultant current again after so correcting, distortion can preferably be corrected.This step is repeated, can
Obtain the electric current for being similar to ideal waveform.
Embodiments of the invention are described above in conjunction with accompanying drawing, but the invention is not limited in above-mentioned specific
Embodiment, above-mentioned embodiment is only schematical, rather than restricted, one of ordinary skill in the art
Under the enlightenment of the present invention, in the case of present inventive concept and scope of the claimed protection is not departed from, it can also make a lot
Form, these are belonged within the protection of the present invention.
Claims (6)
1. a kind of electronic direct current transformer transient characterisitics experimental rig, it is characterised in that including synthesis loop control system, side
Ripple power-supply system, stacked switch, detection means, the square wave power system include direct current steepness power supply, steepness power supply compensation dress
Put and controlled power of direct current, the synthesis loop control system and direct current steepness power supply, steepness power compensation device, direct current are controllable
Three sets of power supplys of power supply are connected in parallel respectively by network interface connection, the positive and negative level of output end of three sets of power supplys；
The synthesis loop control system is used to first calculate direct current steepness power supply, steepness power compensation device, direct current controllable current
The respective waveform reference in source and synthesis sequential are handed down to each supply unit, control direct current steepness power supply, the compensation of steepness power supply again
Device, controlled power of direct current are according to given route again by the controlled current waveform of synthesis sequential export；
The direct current steepness power supply, steepness power compensation device are used for the class index current waveform for producing steepness；
The controlled power of direct current is used for the compensation for carrying out square wave current；
The stacked switch is used for the duration for controlling load current；
The detection means is used to detect direct current square wave current and record experiment process data and returns to the synthesis loop control
System processed.
2. a kind of electronic direct current transformer transient characterisitics experimental rig according to claim 1, it is characterised in that described
Synthesis loop control system includes square wave current detection means, communicator and upper computer control system.
3. a kind of electronic direct current transformer transient characterisitics experimental rig according to claim 1, it is characterised in that described
Controlled power of direct current include rectified three-phase circuit, DC/AC high-frequency inverter circuits, high-frequency rectification circuit, output filter circuit and
Control protection electric circuit forms.
4. a kind of electronic direct current transformer transient characterisitics experimental rig according to claim 1, it is characterised in that described
Stacked switch is made up of IGBT parallel connections group and its drive circuit, the line that the synthesis loop control system passes through changing-over combined switching
Road path adjusts the duration of load current.
5. a kind of electronic direct current transformer transient characterisitics experimental rig according to claim 1, it is characterised in that described
Direct current steepness power supply is made up of high frequency voltage pulse power supply, commutator, storage capacitor, fly-wheel diode and controllable impedance.
6. the control method of electronic direct current transformer transient characterisitics experimental rig any one of a kind of claim 1-5,
It is characterised in that it includes following steps：
Step S010, the synthesis loop control system receive TD and index request, calculate required resultant current
Waveform, direct current steepness power supply amplitude and rise and fall time constant, steepness power compensation device amplitude and rise and fall time are normal
Number, the reference waveform curve of controlled power of direct current, and it is handed down to each supply unit；
Step S020, the direct current steepness power supply receive control instruction, and loading test parameter is simultaneously standby；
Step S030, the direct current steepness power compensation device receive control instruction, and loading test parameter is simultaneously standby；
Step S040, the controlled power of direct current receive waveform datum curve and completed, and start, are followed according to the path of datum curve
Waveform simultaneously exports；
Step S050, the controlled power of direct current start direct current steepness power supply, the direct current steepness power supply in first timing point
Output current；
Step S060, the controlled power of direct current start direct current steepness power compensation device, the direct current in second timing point
Steepness electric power outputting current；
Step S070, the direct current steepness power supply, steepness power compensation device, the output current of controlled power of direct current are in output line
Waveform composition is completed on road, is disturbed by circuit stray capacitance inductance parameters, produces a current waveform for being similar to square wave, the electricity
Flow ripple part shape and distortion be present；
Step S080, first round experiment are completed, and the synthesis loop control system completes recording, and by recording waveform with testing institute
Comparison of wave shape is needed, calculates both waveform errors, the waveform base of controlled power of direct current will be added to after error calculation processing
In standard, the benchmark is allowed to produce a reverse error compensation amount；
Step S090, repeat the above steps 1~3 time, until output current is consistent with target current waveform, with now each power supply
Control program of the control parameter and datum curve of device as the testing site.
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| CN113655274A (en) * | 2021-08-30 | 2021-11-16 | 西安交通大学 | System and method for detecting transient transmission performance of combined electronic transformer |
| CN116755020A (en) * | 2023-07-06 | 2023-09-15 | 浙江天际互感器股份有限公司 | Anti-direct current transformer half-wave error detection system and method based on harmonic comparison method |
| CN117031379A (en) * | 2023-10-08 | 2023-11-10 | 清华四川能源互联网研究院 | High-frequency characteristic verification circuit of current sensor and verification method thereof |
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| CN117031379A (en) * | 2023-10-08 | 2023-11-10 | 清华四川能源互联网研究院 | High-frequency characteristic verification circuit of current sensor and verification method thereof |
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