CN206945888U - A kind of grid adaptability test device - Google Patents
A kind of grid adaptability test device Download PDFInfo
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- CN206945888U CN206945888U CN201720876007.9U CN201720876007U CN206945888U CN 206945888 U CN206945888 U CN 206945888U CN 201720876007 U CN201720876007 U CN 201720876007U CN 206945888 U CN206945888 U CN 206945888U
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Abstract
A kind of grid adaptability test device of disclosure, including：Disturb supply unit, disturbance line switching and by-pass switch, it is characterised in that the disturbance supply unit includes：Phase-shifting transformer, four quadrant convertor and master controller；The master controller is connected with the phase-shifting transformer and the four quadrant convertor respectively；The phase-shifting transformer includes：First voltage transformer, the first current transformer, second voltage transformer and the second current transformer being connected respectively with the master controller；The four quadrant convertor uses three-phase Cascade Topology Structure structure, and each phase is made up of 30 power conversion unit cascades；The power conversion unit includes：Rectifier terminal, main control end and inversion end.The grid adaptability test device that the application provides, can effectively solve the problems, such as that existing test device power quality is low.
Description
Technical field
The application is related to power network technical field of measurement and test, more particularly to a kind of grid adaptability test device.
Background technology
Preferable supply voltage waveform should be pure sine wave, and possess nominal amplitude and frequency, but due to supplying
Power network itself stability and robustness deficiency, easy frequency of occurrences deviation, voltage deviation, voltage pulsation in flickering, temporarily
Or the disturbance sex chromosome mosaicism such as transient overvoltage, wave distortion and voltage dip and short time interruption, so as to cause electrical equipment event
Barrier or cisco unity malfunction.Now, electrical equipment is tested and improved to generally use grid adaptability test device to power network
Adaptability.
As shown in figure 1, existing grid adaptability test device generally comprises：Perturbation device, breaker and by-pass switch.
If carrying out conventionally test to electrical equipment, separately breaker, and close by-pass switch, electrical equipment is made to be introduced directly into power network
Electric energy；If carrying out perturbation test to electrical equipment, separately by-pass switch, and close circuit breaker, electrical equipment is made to introduce
The perturbation electric energy that perturbation device provides.
The device that instantaneous short-circuit occurs due to electric capacity etc. in electrical equipment be present, therefore the power supply in disturbance device is usual
Dash current is reduced using soft starting mode such as variable resistor startup or electronic type thyristor voltage regulation soft starting device.But
Variable resistor starter floor space is big, increases civil engineering costs, and can not repeatedly come into operation in a short time；And electronics crystalline substance lock
Pipe pressure regulation soft starting device can reduce power factor of electric network, and then reduce electric energy conversion using phased approach regulation output voltage
Efficiency, power consumption of the increase electrical equipment in test process, and harmonic pollution can be brought, reduce the quality of power supply.
Utility model content
The application provides a kind of grid adaptability test device, and to solve, existing test device power quality is low to ask
Topic.
According to embodiments herein, there is provided a kind of grid adaptability test device, including：Disturb supply unit, disturbance
Line switching and by-pass switch, it is characterised in that the disturbance supply unit includes：Phase-shifting transformer, four quadrant convertor and
Master controller；
The master controller is connected with the phase-shifting transformer and the four quadrant convertor respectively, is referred to for producing control
Make and send to the phase-shifting transformer and the four quadrant convertor；
The phase-shifting transformer is used for the input terminal for connecting disturbance power network；
The phase-shifting transformer includes：First voltage transformer, the first electric current being connected respectively with the master controller
Transformer, second voltage transformer and the second current transformer, for measuring normal grid and disturbing the input voltage letter of power network
Number and input current signal；
The four quadrant convertor uses three-phase Cascade Topology Structure structure, and each phase is cascaded by 30 power conversion units
Composition, for according to the control instruction, producing perturbation voltage and frequency, and export sine wave；
The power conversion unit includes：Rectifier terminal, main control end and inversion end；
The main control end is used to calculate reactive power to be compensated, and controls the power conversion unit output to wait to mend with described
Repay the reactive power of reactive power equivalent；
The rectifier terminal is used to the ac voltage signal that the phase-shifting transformer exports being rectified into d. c. voltage signal；
The inversion end uses H bridge type circuit, and the d. c. voltage signal inversion for will be exported by the rectifier terminal strikes a bargain
Flow voltage signal.
Alternatively, the phase-shifting transformer also includes：N group vice-side windings；
The output voltage amplitude of the vice-side winding is equal, and the phase angle of each winding differs a phase shifting angle successively；
The phase shifting angle is 60 °/N.
Alternatively, the inversion end also includes：DC support electric capacity and sub-controller；
The DC support electric capacity is used for stable DC voltage；
The sub-controller is described for receiving respectively with DC support electric capacity, H-bridge inverter circuit and the master controller
The instruction of master controller, and feed back to the master controller status information at the inversion end.
Alternatively, each bridge arm of the rectifier terminal uses 2 same model IGBT or IGCT in parallel, the inversion end
Each bridge arm use 3 IGBT or IGCT in parallel.
Alternatively, the four quadrant convertor is modulated using phase-shifted SPWM, for reducing the humorous of output voltage signal
Ripple content.
Alternatively, the first voltage inductor, first current inductor, the second voltage inductor and described
Second current inductor is connected respectively at the master controller by optical fiber.
Alternatively, described device also includes：Input breaker；
The input breaker is connected with the disturbance line switching, for controlling the break-make of grid disturbance system safety testing device
Electricity.
From above technology, the application provides a kind of grid adaptability test device, including：Disturbance supply unit, disturb
Moving-wire way switch and by-pass switch, it is characterised in that the disturbance supply unit includes：Phase-shifting transformer, four quadrant convertor
And master controller；The master controller is connected with the phase-shifting transformer and the four quadrant convertor respectively, for producing control
System is instructed and sent to the phase-shifting transformer and the four quadrant convertor；The phase-shifting transformer is used to connect disturbance power network
Input terminal；The phase-shifting transformer includes：First voltage transformer, the first electricity being connected respectively with the master controller
Current transformer, second voltage transformer and the second current transformer, for measuring normal grid and disturbing the input voltage of power network
Signal and input current signal；The four quadrant convertor uses three-phase Cascade Topology Structure structure, and each phase is by 30 power
Converter unit cascade composition, for according to the control instruction, producing perturbation voltage and frequency, and export sine wave；It is described
Power conversion unit includes：Rectifier terminal, main control end and inversion end；The main control end is used to calculate reactive power to be compensated, and controls
Make the power conversion unit output and the reactive power of the reactive power equivalent to be compensated；The rectifier terminal is used for by described in
The ac voltage signal of phase-shifting transformer output is rectified into d. c. voltage signal；The inversion end uses H bridge type circuit, for inciting somebody to action
The d. c. voltage signal exported by the rectifier terminal is reverse into ac voltage signal.
In use, disturbance line switching is connected with disturbance supply unit, it is in parallel with by-pass switch to be connected into power network.If need
Conventionally test carried out to electrical equipment, then disconnect the disturbance line switching, and close the by-pass switch, by electrical equipment
It is introduced directly into power network electric energy；If necessary to carry out perturbation test to electrical equipment, then the by-pass switch is disconnected, and close institute
Disturbance line switching is stated, electric energy is provided for electrical equipment with the disturbance supply unit.When the electrical equipment access disturbance electricity
During source device, instruction is sent to phase-shifting transformer by master controller, by the first voltage transformer in the phase-shifting transformer,
First current transformer, second voltage transformer and the second current transformer gather from the defeated of the disturbance supply unit respectively
Going out voltage/current signals, the output voltage/electric current signal enters four quadrant convertor, then by the master controller to described
Four quadrant convertor sends instruction, and forcing frequency and voltage waveform, and realization pair simultaneously are adjusted by the four quadrant convertor
The reactive-load compensation of the output voltage/electric current signal, so as to improve electric energy conversion efficiency, ensure the electricity that disturbance supply unit provides
Can quality.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the application, letter will be made to the required accompanying drawing used in embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of existing grid adaptability test device；
Fig. 2 is a kind of structural representation for grid adaptability test device that the embodiment of the present application provides；
Fig. 3 is the internal structure schematic diagram for the disturbance supply unit that the embodiment of the present application provides；
Fig. 4 is the internal structure schematic diagram for the phase-shifting transformer that the embodiment of the present application provides；
Fig. 5 is the structural representation for the power conversion unit that the embodiment of the present application provides；
Fig. 6 is the structural representation at the power conversion unit inversion end that the embodiment of the present application provides；
Fig. 7 is the four quadrant convertor three-phase cascading topological structure schematic diagram that the embodiment of the present application provides；
Fig. 8 is H-bridge inverter circuit topological structure schematic diagram in the power conversion unit of the embodiment of the present application offer；
Fig. 9 is the structural representation for another grid adaptability test device that the embodiment of the present application provides.
Illustrate：
Wherein：100- disturbance line switchings, 200- disturbance supply units, 210- master controllers, 220- phase-shifting transformers,
221- first voltage transformers, the current transformers of 222- first, 223- second voltage transformers, the current transformers of 224- second,
230- four quadrant convertors, 240- power conversion units, 241- main control ends, 242- rectifier terminals, 243- inversions end, 244- controls
Device, 245- DC support electric capacity, 246-H bridge inverter circuits, 300- by-pass switches, 400- input breakers.
Embodiment
Referring to Fig. 2, a kind of structural representation of grid adaptability test device.
The present embodiment provides a kind of grid adaptability test device, including：Disturb supply unit 200, disturbance line switching
100 and by-pass switch 300, it is characterised in that the disturbance supply unit 200 includes：Phase-shifting transformer 220, four-quadrant unsteady flow
Device 230 and master controller 210；
The master controller 210 is connected with the phase-shifting transformer 220 and the four quadrant convertor 230 respectively, is used for
Produce control instruction and send to the phase-shifting transformer 220 and the four quadrant convertor 230；
The phase-shifting transformer 220 is used for the input terminal for connecting disturbance power network；
The phase-shifting transformer 220 includes：The first voltage transformer 221 that is connected respectively with the master controller 210,
First current transformer 222, the current transformer 224 of second voltage transformer 223 and second, for measuring normal grid and disturbance
The input voltage signal and input current signal of power network；
The four quadrant convertor 230 uses three-phase Cascade Topology Structure structure, and each phase is by 30 power conversion units
240 cascade compositions, for according to the control instruction, producing perturbation voltage and frequency, and export sine wave；
The power conversion unit 240 includes：Rectifier terminal 242, main control end 241 and inversion end 243；
The main control end 241 is used to calculate reactive power to be compensated, and controls the power conversion unit 240 to export and institute
State the reactive power of reactive power equivalent to be compensated；
The rectifier terminal 242 is used to the ac voltage signal that the phase-shifting transformer 220 exports being rectified into DC voltage
Signal；
The inversion end 243 uses H bridge type circuit, for the d. c. voltage signal exported by the rectifier terminal to be reverse into
Ac voltage signal.
From above-described embodiment as can be seen that being connected in use, line switching 100 and disturbance supply unit 200 will be disturbed, with
The parallel connection of by-pass switch 300 is connected into power network.If necessary to carry out conventionally test to electrical equipment, then the disturbance line switching is disconnected
100, and the by-pass switch 300 is closed, electrical equipment is introduced directly into power network electric energy；If necessary to be disturbed to electrical equipment
Dynamic property test, then disconnect the by-pass switch 300, and closes the disturbance line switching 100, with the disturbance supply unit
200 provide electric energy for electrical equipment.As shown in figure 3, when the electrical equipment access disturbance supply unit 200, pass through master control
Device 210 processed sends instruction to phase-shifting transformer 220, as shown in figure 4, by the first voltage mutual inductance in the phase-shifting transformer 220
Device 221, the first current transformer 222, the current transformer 224 of second voltage transformer 223 and second gather from described respectively
The output voltage/electric current signal of supply unit 200 is disturbed, the output voltage/electric current signal enters four quadrant convertor 230,
Instruction is sent to the four quadrant convertor 230 by the master controller 210 again, adjusted by the four quadrant convertor 230
Forcing frequency and voltage waveform, and the reactive-load compensation to the output voltage/electric current signal is realized simultaneously, turn so as to improve electric energy
Change efficiency, ensure the quality of power supply that disturbance supply unit provides.
As shown in fig. 7, the four quadrant convertor 230 uses three-phase, 30 power conversion units 240 cascade, to described
The frequency and waveform of output voltage/electric current signal are adjusted control, because cascade number is more, can effectively improve equivalent switch frequency
Rate, therefore the voltage waveform exported, so being not required to additionally use traditional LCL filter, simplifies device, and save very close to sine wave
About testing procedure, while ensureing power quality, improve testing efficiency.
As shown in Figures 4 and 5, the rectifier terminal 242 of the power conversion unit 240 is designed using controllable rectifier bridge, Neng Goushi
When detect the input current of the power conversion unit 240, and carry out Isobarically Control, while the input current can be sweared
Amount is decomposed.
Main control end 241 in the power conversion unit 240 uses T12407 main control chips, and the rectifier terminal 242 passes through
Resolution of vectors technology, input current is decomposed into watt current and reactive current, by the main control end 241 in DC voltage closed loop
Output watt current instructs.The first voltage inductor 221 and first current inductor 222 are arranged at the phase shift and become
The grid side of depressor 220, the second voltage inductor 223 and second current inductor 224 are arranged at the phase shift and become
Depressor 220 is close to AC reactor output end side, and the main control end 241 is according to the second voltage transformer 223 and described
The voltage/current signals of the disturbance supply unit 200 output of second current transformer 224 measurement, calculate nothing to be compensated
Work(power, and instruction is sent to the power conversion unit 240, the output of control power conversion unit 240 with it is described to be compensated
Reactive power equivalent reactive power, so as to realize reactive-load compensation, ensure the quality of power supply.
To on the interconnection of the rectifier terminal 242 of the first voltage transformer 221 to the power conversion unit 240
Voltage ua, ubAnd ucSampled, and controlled with phaselocked loop (Phase Locked Loop, PLL).The electric network voltage phase of extraction
For θ, the electric current i to flowing through interconnectiona, ibAnd ic, watt current i is calculateddWith reactive current iq.To the rectifier terminal 242
With the voltage u between the inversion end 243dcBe acquired, and with given voltage stabilizing amplitude udc ※Make the difference, difference controls by PI
Voltage stabilizing controlled quentity controlled variable is obtained after device, and the voltage/current signals collected according to the primary side side of phase-shifting transformer 220 are calculated
Reactive-load compensation amount Δ iqcomp, Δ iqcomp is added to reactive current iqFeedback control loop in, carry out reactive-load compensation control
System.
Alternatively, the phase-shifting transformer 220 also includes：N group vice-side windings；
The output voltage amplitude of the vice-side winding is equal, and the phase angle of each winding differs a phase shifting angle successively；
The phase shifting angle is 60 °/N.
The phase-shifting transformer 220 is one kind of rectifier transformer, single-phase electric action caused by fairing, can be drawn
The alternating magnetic field wave distortion of phase-shifting transformer 220 is played, but passes through the on high-tension side winding to the phase-shifting transformer 220
Phase shift is carried out, makes phase shift number increase, so as to reduce the distortion degree of alternating magnetic field waveform, it is 30 that N is selected in the present embodiment, so
Phase shifting angle is 2 °.
Alternatively, the inversion end 243 also includes：DC support electric capacity 245 and sub-controller 244；
The DC support electric capacity 245 is used for stable DC voltage；
The sub-controller 244 respectively with DC support electric capacity 245, H-bridge inverter circuit 246 and the master controller 210,
For receiving the instruction of the master controller 210, and feed back to the master controller 210 status information at the inversion end 243.
The DC support electric capacity 245 has that high voltage withstanding, resistance to high current, Low ESR, low inductance, capacity loss be small, leakage
The advantages that electricity is less, temperature performance is good, charge/discharge rates are fast, service life is long, safety anti-explosive stability is high, can in inverter circuit
To carry out smothing filtering to the output voltage of the rectifier terminal 242；Amplitude pulsating current is absorbed, so as to prevent amplitude from pulsing
Electric current produces amplitude pulsating volage in impedance, makes the voltage pulsation on dc bus keep in allowed limits；Simultaneously
Effectively prevent voltage overshoot and instantaneous voltage to IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar
Transistor npn npn) circuit influence.
As shown in fig. 6, the instruction that the sub-controller 244 is sent by receiving the master controller 210, is instructed described straight
Stream Support Capacitor 245 works, so as to provide steady dc voltage；And the H-bridge inverter circuit 246 is controlled by DC voltage
Alternating voltage is converted into, referring to Fig. 8.
Alternatively, each bridge arm of the rectifier terminal 242 uses 2 same model IGBT or IGCT in parallel
(Integrated Gate Commutated Thyristors, integrating braised chicken circulation IGCT), each bridge at the inversion end
Arm uses 3 IGBT or IGCT in parallel.
The capacity of system has reached MW class, is three-phase for the rectifier terminal in order to increase current output capability
Rectification, three bridge arms are shared, each phase bridge arm is in parallel using 2 IGBT or IGCT with model, can make the electric current flowed through
Put and be twice.But number of parallel can not be excessive, because with the increase of number in parallel, the balance degree of electric current is more difficult to control
System, and fault rate can be increased.
The inversion end is single-phase inversion, only two bridge arms, in order to ensure current balance handling capacity, using 3
Individual IGBT or IGCT are in parallel.
Alternatively, the four quadrant convertor 230 is using phase-shifted SPWM (Sinusoidal Pulse Wicth
Modulation, pulse width modulation) modulation, for reducing the harmonic content of output voltage signal.
The general principle of phase-shifted SPWM modulation is the single-phase converter to N number of unit module composition, Ge Gedan
Element module all uses the SPWM modulator approaches of low switching frequency.Each unit uses same modulating wave, with N number of triangle wavelength-division
It is not modulated, each triangular carrier has identical frequency and amplitude, but phase differs fixed angle successively, so that each
The SPWM pulses of unit output are staggered certain angle, and equivalent switching frequency greatly increases, the four quadrant convertor after superposition
The waveform of final output is the staircase waveform of level more than one.Select suitable phase shifting angle that the harmonic content of output voltage can be made big
It is big to reduce.In the present embodiment, the 3-phase power converter that is modulated using phase-shifted SPWM technology, three phase sine value is differed successively
120 °, the change per phase each unit carrier wave can use unipolarity to modulate, 30 carrier wave phase shifts successively as it was previously stated, when modulating
The angle of π/30 so that 30 SPWM pulses are staggered certain angle, and equivalent carrier frequency is that (f is single carrier wave frequency to 2 × 30f
Rate), output phase voltage be by be 2 × 30+1 level staircase waveform, line voltage is the staircase waveform of 4 × 30+1 level.
Alternatively, the first voltage inductor 221, first current inductor 222, the second voltage inductor
223 are connected with second current inductor 224 respectively at the master controller 210 by optical fiber.
Be distributed in due to the power conversion unit of Cascade Topology Structure in different power cabinets, with the master controller distance compared with
Far, it is necessary to realize unified indiscriminate control.Optical-fibre communications speed is fast, and apart from remote, is not easy to be disturbed in transmitting procedure, can
Phototube Coupling is realized, disclosure satisfy that above-mentioned requirements.
Alternatively, described device also includes：Input breaker 400；
The input breaker 400 is connected with the disturbance line switching 100, for controlling grid disturbance system safety testing device
Power on/off.
As shown in figure 9, the disjunction by controlling the input breaker 400, controls opening for the disturbance supply unit 200
Dynamic and pause, reduces the error of manual operation, lifting operation efficiency.
From above technical scheme, this application provides a kind of grid adaptability test device, including：Disturb power supply dress
Put 200, disturbance line switching 100 and by-pass switch 300, it is characterised in that the disturbance supply unit 200 includes：Phase shift becomes
Depressor 220, four quadrant convertor 230 and master controller 210；The master controller 210 respectively with the phase-shifting transformer 220 and
The four quadrant convertor 230 connects, for producing control instruction and sending to the phase-shifting transformer 220 and the four-quadrant
Current transformer 230；The phase-shifting transformer 220 is used for the input terminal for connecting disturbance power network；The phase-shifting transformer 220 includes：
The first voltage transformer 221 that is connected respectively with the master controller 210, the first current transformer 222, second voltage mutual inductance
The current transformer 224 of device 223 and second, for measuring normal grid and disturbing the input voltage signal and input current letter of power network
Number；The four quadrant convertor 230 uses three-phase Cascade Topology Structure structure, and each phase is by 30 240 grades of power conversion units
Connection composition, for according to the control instruction, producing perturbation voltage and frequency, and export sine wave；The power conversion list
Member 240 includes：Rectifier terminal 242, main control end 241 and inversion end 243；The main control end 241 is used to calculate reactive power to be compensated,
And control the output of power conversion unit 240 and the reactive power of the reactive power equivalent to be compensated；The rectifier terminal 242
Ac voltage signal for the phase-shifting transformer 220 to be exported is rectified into d. c. voltage signal；The inversion end 243 uses
H bridge type circuit, for the d. c. voltage signal exported by the rectifier terminal to be reverse into ac voltage signal.
In use, disturbance line switching 100 and disturbance supply unit 200 are connected, it is in parallel with by-pass switch 300 to be connected into electricity
Net.If necessary to carry out conventionally test to electrical equipment, then the disturbance line switching 100 is disconnected, and close the bypass and open
300 are closed, electrical equipment is introduced directly into power network electric energy；If necessary to carry out perturbation test to electrical equipment, then described in disconnection
By-pass switch 300, and the disturbance line switching 100 is closed, provide electricity with the disturbance supply unit 200 for electrical equipment
Energy.When the electrical equipment access disturbance supply unit 200, finger is sent to phase-shifting transformer 220 by master controller 210
Order, by the first voltage transformer 221 in the phase-shifting transformer 220, the first current transformer 222, second voltage transformer
223 and second current transformer 224 gather respectively from it is described disturbance supply unit 200 output voltage/electric current signal, it is described
Output voltage/electric current signal enters four quadrant convertor, then the four quadrant convertor 230 is sent out by the master controller 210
Go out instruction, forcing frequency and voltage waveform are adjusted by the four quadrant convertor 230, and realize simultaneously to the output electricity
The reactive-load compensation of pressure/current signal, so as to improve electric energy conversion efficiency, ensure the quality of power supply that disturbance supply unit provides.
It should be appreciated that the precision architecture that the application is not limited to be described above and is shown in the drawings, and
And various modifications and changes can be being carried out without departing from the scope.Scope of the present application is only limited by appended claim.
Claims (7)
1. a kind of grid adaptability test device, including：Disturb supply unit, disturbance line switching and by-pass switch, its feature
It is, the disturbance supply unit includes：Phase-shifting transformer, four quadrant convertor and master controller；
The master controller is connected with the phase-shifting transformer and the four quadrant convertor respectively；
The phase-shifting transformer is used for the input terminal for connecting disturbance power network；
The phase-shifting transformer includes：First voltage transformer, the first Current Mutual Inductance being connected respectively with the master controller
Device, second voltage transformer and the second current transformer；
The four quadrant convertor uses three-phase Cascade Topology Structure structure, and each phase is by 30 power conversion unit cascaded series
Into；
The power conversion unit includes：Rectifier terminal, main control end and inversion end；
The inversion end uses H bridge type circuit.
2. a kind of grid adaptability test device according to claim 1, it is characterised in that the phase-shifting transformer also wraps
Include：N group vice-side windings；
The output voltage amplitude of the vice-side winding is equal, and the phase angle of each winding differs a phase shifting angle successively；
The phase shifting angle is 60 °/N.
3. a kind of grid adaptability test device according to claim 1, it is characterised in that the inversion end also includes：
DC support electric capacity and sub-controller；
The sub-controller respectively with DC support electric capacity, H-bridge inverter circuit and the master controller.
A kind of 4. grid adaptability test device according to claim 1, it is characterised in that each bridge of the rectifier terminal
Arm uses 2 same model IGBT or IGCT in parallel, each bridge arm at the inversion end using 3 IGBT in parallel or
IGCT。
5. a kind of grid adaptability test device according to claim 1, it is characterised in that the four quadrant convertor is adopted
Modulated with phase-shifted SPWM.
A kind of 6. grid adaptability test device according to claim 1, it is characterised in that the first voltage sensing
Device, first current inductor, the second voltage inductor and second current inductor are respectively at the main control
Device is connected by optical fiber.
7. a kind of grid adaptability test device according to claim 1, it is characterised in that described device also includes：It is defeated
Enter breaker；
The input breaker is connected with the disturbance line switching.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720876007.9U CN206945888U (en) | 2017-07-19 | 2017-07-19 | A kind of grid adaptability test device |
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| CN201720876007.9U CN206945888U (en) | 2017-07-19 | 2017-07-19 | A kind of grid adaptability test device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107153152A (en) * | 2017-07-19 | 2017-09-12 | 云南电网有限责任公司电力科学研究院 | A kind of grid adaptability test device |
| CN113049978A (en) * | 2021-03-22 | 2021-06-29 | 西安新艾电气技术有限公司 | Online disturbance occurrence detection system and method for series power supply system |
-
2017
- 2017-07-19 CN CN201720876007.9U patent/CN206945888U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107153152A (en) * | 2017-07-19 | 2017-09-12 | 云南电网有限责任公司电力科学研究院 | A kind of grid adaptability test device |
| CN113049978A (en) * | 2021-03-22 | 2021-06-29 | 西安新艾电气技术有限公司 | Online disturbance occurrence detection system and method for series power supply system |
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