CN202797977U - Power electronic system combining voltage support with fault current limiting - Google Patents
Power electronic system combining voltage support with fault current limiting Download PDFInfo
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- CN202797977U CN202797977U CN201220463194.5U CN201220463194U CN202797977U CN 202797977 U CN202797977 U CN 202797977U CN 201220463194 U CN201220463194 U CN 201220463194U CN 202797977 U CN202797977 U CN 202797977U
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Abstract
The utility model discloses a power electric system combining voltage support with fault current limiting. The power electronic system comprises a power supply, a coupling transformer, a switch tube, a dynamic voltage restorer, a short circuit current detection circuit, a controller, a current-limiting inductor and a load, wherein the dynamic voltage restorer comprises a rectifying bridge, an inverter bridge and a filter device which are connected sequentially; and the output of the dynamic voltage restorer is connected with the secondary side of the coupling transformer through the switch tube, and the primary side of the coupling transformer is connected to a grid after parallel connection with the current-limiting inductor and the nonlinear load. According to the power electronic system, the rapid current-limiting performance of a fault current limiter is used, continuous offset voltage fluctuation performance of the dynamic voltage restorer is combined, so that the utilization rate of equipment is high, economic benefits are good, and the defects of sole use of the fault current limiter and the dynamic voltage restorer are overcome.
Description
Technical field
The utility model relates to a kind of efficient electrical power electronic system of taking into account voltage support and failure current limit.
Background technology
Along with the electric power system scale enlarge gradually and that power equipment uses is day by day universal, electric energy has become the key factor closely bound up with the human being's production life.And along with the intensification of power consumer to the degree of dependence of electric energy, and industrial development is to producing requirement, also is subject to gradually increasing attention for the concern of the quality of power supply.In many power quality problems, voltage sag occurs the most frequently, loss is the most serious.This fault may cause the damage for converting equipment, power consumption equipment in the electric power system, jeopardizes the normal safe and stable operation of electric power system, affects user's normal production, life activity.For addressing this problem, the device that suppresses voltage sag is had higher requirement: quick limiting short-circuit current in the time of voltage sag that can compensation network.And more existing device Shortcomings: at present normal that adopt is dynamic electric voltage recovery device DVR for the voltage sag problem, and the DVR that uses separately has tandem type and connection in series-parallel mixed type.Although the effectively bucking voltage fluctuation of this device, for the DVR of tandem type, its lasting time of compensation drop-off voltage is subject to the capacity limit of dc energy storage device, and for the DVR of Serial-Parallel Type, its cost is higher and floor space is large.And when load-side was short-circuited, the DVR of two kinds of patterns can not effectively suppress short circuit current.Be illustrated in figure 1 as the DVR of parallel connection type, its operation principle is: when grid side voltage
Occur voltage temporarily with the time, DVR injects an amplitude, the controlled bucking voltage of phase place in circuit, stable to guarantee load voltage.
Summary of the invention
Technical problem to be solved in the utility model is for the prior art deficiency, to provide a kind of power electronic system of taking into account voltage support and failure current limit, electric energy loss and the installation cost of reduction low-voltage network, the optimization on realization economy and the effect.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of power electronic system of taking into account voltage support and failure current limit, comprise the power electronic system of taking into account voltage support and failure current limit, the described power electronic system of taking into account voltage support and failure current limit comprises power supply, coupling transformer, switching tube, dynamic electric voltage recovery device, short-circuit current detection circuit, controller, current-limiting inductance, load, described dynamic electric voltage recovery device comprises the rectifier bridge that connects successively, inverter bridge and filter, rectifier bridge is connected with power supply, power supply is connected with load by current-limiting inductance, current-limiting inductance also accesses the former limit of coupling transformer, coupling transformer is connected with filter by switching tube, the switching tube of controller control rectifier bridge and inverter bridge, short-circuit current detection circuit is by drive circuit and coupling transformer, switching tube between the filter connects.
The control method of this power electronic system is:
1) detects supply voltage
And electric current
, the inverter bridge dc capacitor voltage
, the load-side electric current
, dynamic electric voltage recovery device output bucking voltage
And the input current instantaneous value of dynamic electric voltage recovery device
2) according to the load-side current value that detects
, short-circuit current detection circuit judges whether load-side short trouble occurs, and exports corresponding switching signal
If short circuit appears in load-side, the short-circuit current detection circuit output low level, namely
Be 0, then the first drive circuit all disconnects the switching tube between dynamic electric voltage recovery device and the coupling transformer secondary, the second drive circuit all turn-offs the switching tube of the rectifier bridge part of dynamic electric voltage recovery device simultaneously, the 3rd drive circuit all disconnects the switching tube of inverter bridge part, and dynamic electric voltage recovery device is fully out of service; If the voltage fluctuation fault appears in load-side, short-circuit current detection circuit output high level, namely
Be 1, then the first drive circuit makes the whole conductings of switching tube between dynamic electric voltage recovery device and the coupling transformer secondary, the second drive circuit and the 3rd drive circuit make dynamic electric voltage recovery device be operated in the voltage compensation state, and dynamic electric voltage recovery device puts into operation, enters 3);
3) according to sample voltage value
,
,
And current value
,
Rule according to the expert reasoning judgement, determine the bucking voltage value of dynamic electric voltage recovery device, by controller to the dynamic electric voltage recovery device working signal, the bucking voltage set-point of dynamic electric voltage recovery device is provided simultaneously, dynamic electric voltage recovery device is according to its given reference signal value, produce pwm signal to rectifier bridge and inverter bridge by the second drive circuit and the 3rd drive circuit, simultaneously dc capacitor voltage is fed back, formation voltage inter-loop feedback, the Voltage Feedback of inverter bridge output is returned, form independently outer shroud Voltage Feedback.
Acting in conjunction by dynamic electric voltage recovery device and fault current limiter (current-limiting inductance and the switching tube of connecting with coupling transformer) has realized voltage real-Time Compensation and quick current-limiting performance.
Operation principle of the present utility model is: the described efficient electrical power electronic system of taking into account voltage support and failure current limit comprises dynamic electric voltage recovery device DVR and fault current limiter FCL.According to system's real time data, drawn the decision informations such as control model of the short circuit current signal of voltage that DVR will compensate and restriction by the expert reasoning judging unit.By the pwm signal that Intelligent treatment level (PI) controller and the comparison module of drive circuit sends rectifier bridge and the voltage-type inverter bridge of execution level are controlled; When being short-circuited, work in the FCL pattern, when the normal operation of load or generation voltage fluctuation, work in the DVR pattern.
Compared with prior art, the beneficial effects of the utility model are: this system has increased fault current limiter on the basis of a DVR, when normal operation is not short-circuited, this system works is in the DVR pattern, can compensate from the grid side voltage fluctuation, when working in short-circuit condition, the first drive circuit can send cut-off signal to the full-control type device that is series at the coupling transformer secondary, the triggering signal of simultaneously the second drive circuit and the 3rd drive circuit sealing rectifier bridge inverter bridge, DVR is fully out of service, and the series transformer secondary side is equivalent to open circuit, and impedance is very big, short circuit current almost all flows through from inductance L, thus restriction grid short circuit electric current; System of the present utility model has reduced electric energy loss and the installation cost of low-voltage network, has realized the optimization on economy and the effect.
Description of drawings
Fig. 1 is the topological structure schematic diagram of traditional dynamic electric voltage recovery device;
Fig. 2 is the power electronic system structural representation that the utility model one embodiment takes into account voltage support and failure current limit;
Fig. 3 is the utility model one embodiment voltage-tracing control structure schematic diagram;
Fig. 4 is the utility model one embodiment short-circuit current detection circuit structural representation.
Embodiment
As shown in Figure 2, the utility model one embodiment comprises power supply, coupling transformer, switching tube, dynamic electric voltage recovery device, short-circuit current detection circuit, controller, current-limiting inductance, load, and described dynamic electric voltage recovery device comprises rectifier bridge, inverter bridge and the filter that connects successively; Rectifier bridge is connected with power supply, power supply is connected with load by current-limiting inductance, current-limiting inductance also accesses the former limit of coupling transformer, coupling transformer is connected with filter by switching tube, controller is controlled respectively the switching tube of rectifier bridge and inverter bridge by the second drive circuit, the 3rd drive circuit, short-circuit current detection circuit is connected with switching tube between coupling transformer, the filter by the first drive circuit.
Take into account efficient electrical power electronic system and the control method of voltage support and failure current limit, may further comprise the steps:
1) the input current instantaneous value of detection single phase poaer supply voltage and current, dc capacitor voltage, load-side electric current, DVR output bucking voltage and DVR
With
With
2) according to the load-side current value that detects
, short-circuit current detection circuit judges whether load-side short trouble occurs, and exports corresponding switching signal
If short circuit appears in load-side, the short-circuit current detection circuit output low level, namely
Be 0, then the first drive circuit all disconnects the switching tube between dynamic electric voltage recovery device (DVR) and the coupling transformer secondary, the second drive circuit all turn-offs the switching tube of the rectifier bridge part of DVR simultaneously, the 3rd drive circuit all disconnects the switching tube of inverter bridge part, and DVR is fully out of service; If the voltage fluctuation fault appears in load-side, short-circuit current detection circuit output high level, namely
Be 1, then the first drive circuit makes the whole conductings of switching tube between DVR and the coupling transformer secondary, and the second drive circuit and the 3rd drive circuit make DVR be operated in the voltage compensation state, and DVR puts into operation, enters 3);
3) according to sampled voltage, current value, according to the rule that expert reasoning is judged, determine the bucking voltage value of DVR.Give the DVR working signal of execution level by decision-making treatment level Expert Controller (dsp controller), the bucking voltage set-point of DVR is provided simultaneously, DVR is according to its given reference signal value, produce pwm signal to rectifier bridge and the inverter bridge of execution level by the second drive circuit and the 3rd drive circuit, simultaneously dc capacitor voltage is fed back, formation voltage inter-loop feedback is returned the Voltage Feedback of inverter output, forms independently outer shroud Voltage Feedback.
4) by the acting in conjunction of DVR and fault current limiter, efficiently voltage real-Time Compensation and quick current-limiting performance have been realized cheaply.
Described the first drive circuit, the second drive circuit, the 3rd drive circuit are the photoelectric coupling drive circuit.
The utility model is on the basis of an original device of DVR and function, former limit and current limiting inductance at the series coupled transformer of DVR series inverter, secondary is in series with full-control type device (switching tube), play FCL, and the energy storage device of DVR adopts the fully controlled bridge rectifier system, and the input of rectifier bridge is from electrical network.Short-circuit current detection circuit is connected with the first drive circuit, and the first drive circuit drives the switching tube between DVR outlet side and the series coupled transformer.The large capacitance voltage of the DC side of DVR inverter bridge
Send into dsp controller with DVR output bucking voltage, provide afterwards as calculated the rectifier bridge of DVR and the switching tube PWM of inverter bridge and drive signal.DVR can suppress the voltage fluctuation from grid side, and the FCL device can limit short circuit, is the current limiting system of utility model.
Referring to Fig. 3, voltage-tracking control circuit all adopts the triangle wave mode.For inverter bridge, command signal
Supply voltage with reality
Make deviation, the deviate that obtains again with the DVR output voltage
Do deviation after pi regulator, again through after the amplitude limiter and triangle wave, by output pwm signal after the comparator, thus the switching tube of control inverter bridge; For rectifier bridge, command signal
Capacitance voltage value with reality
Do after an amplitude limiter, to multiply by and the synchronous sinusoidal signal of voltage through after the pi regulator after the deviation, just obtained the sinusoidal command signal of alternating current
Then the difference that this command signal and actual AC signal obtain more afterwards makes comparisons with triangular wave after an amplitude limiter through pi regulator, output pwm signal after the comparator again, thereby the switching tube of control rectifier bridge.
Referring to Fig. 4, short-circuit current detection circuit comprises primary current instrument transformer, sensing module, control module, power module, sensing module is connected and composed successively by secondary current instrument transformer, A/D sampling module, comparator, primary current instrument transformer, sensing module, control module connect successively, power module is connected with sensing module, control module, and control module adopts single-chip microcomputer.Large current signal on the power line can be transformed to the voltage signal that is fit to the amplifier use by primary current instrument transformer and secondary current instrument transformer.This voltage signal and large current signal proportion relation.Then voltage signal being sent into the A/D sample circuit samples, and be converted into digital signal, then the reference voltage signal that provides with digital regulation resistance compares, after signal relatively (low level) triggers singlechip interruption, Timer Controlling can be passed through in its inside, and regularly interrupt pin is scanned, in case interrupt, single-chip microcomputer is then exported control signal (high level) and is removed to control special-purpose executive circuit.The full control device that the level signal that produce this moment drives the series connection of series coupled transformer secondary disconnects, seal simultaneously the driving signal of inverter IGBT, make inverter out of service, the series transformer secondary side is equivalent to open circuit, impedance is very big, short circuit current almost all flows through from inductance L, thus restriction grid short circuit electric current.At this moment, because the input of current-limiting inductance, short circuit current descends.
Claims (5)
1. power electronic system of taking into account voltage support and failure current limit, comprise power supply, coupling transformer, switching tube, dynamic electric voltage recovery device, short-circuit current detection circuit, controller, current-limiting inductance, load, it is characterized in that, described dynamic electric voltage recovery device comprises rectifier bridge, inverter bridge and the filter that connects successively; Rectifier bridge is connected with power supply, power supply is connected with load by current-limiting inductance, current-limiting inductance also accesses the former limit of coupling transformer, coupling transformer is connected with filter by switching tube, controller is controlled respectively the switching tube of rectifier bridge and inverter bridge by the second drive circuit, the 3rd drive circuit, short-circuit current detection circuit is connected with switching tube between coupling transformer, the filter by the first drive circuit.
2. the power electronic system of taking into account voltage support and failure current limit according to claim 1 is characterized in that, described controller is dsp controller.
3. the power electronic system of taking into account voltage support and failure current limit according to claim 1, it is characterized in that, described short-circuit current detection circuit comprises primary current instrument transformer, sensing module, control module, power module, sensing module is connected and composed successively by secondary current instrument transformer, A/D sampling module, comparator, primary current instrument transformer, sensing module, control module connect successively, and power module is connected with sensing module, control module.
4. the power electronic system of taking into account voltage support and failure current limit according to claim 3 is characterized in that, described control module is single-chip microcomputer.
5. the power electronic system of taking into account voltage support and failure current limit according to claim 1 and 2 is characterized in that, described the first drive circuit, the second drive circuit, the 3rd drive circuit are the photoelectric coupling drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220463194.5U CN202797977U (en) | 2012-09-12 | 2012-09-12 | Power electronic system combining voltage support with fault current limiting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220463194.5U CN202797977U (en) | 2012-09-12 | 2012-09-12 | Power electronic system combining voltage support with fault current limiting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202797977U true CN202797977U (en) | 2013-03-13 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220463194.5U Expired - Lifetime CN202797977U (en) | 2012-09-12 | 2012-09-12 | Power electronic system combining voltage support with fault current limiting |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393583A (en) * | 2014-11-27 | 2015-03-04 | 瓮福（集团）有限责任公司 | Short-circuit fault current limiting device |
| CN109358255A (en) * | 2018-12-18 | 2019-02-19 | 北京交通大学 | Traction converter failure analysis method and device |
| CN109638884A (en) * | 2018-12-29 | 2019-04-16 | 四川大学 | A kind of DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control |
-
2012
- 2012-09-12 CN CN201220463194.5U patent/CN202797977U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393583A (en) * | 2014-11-27 | 2015-03-04 | 瓮福（集团）有限责任公司 | Short-circuit fault current limiting device |
| CN109358255A (en) * | 2018-12-18 | 2019-02-19 | 北京交通大学 | Traction converter failure analysis method and device |
| CN109358255B (en) * | 2018-12-18 | 2024-03-05 | 北京交通大学 | Traction converter fault analysis method and device |
| CN109638884A (en) * | 2018-12-29 | 2019-04-16 | 四川大学 | A kind of DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control |
| CN109638884B (en) * | 2018-12-29 | 2019-11-26 | 四川大学 | A kind of DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130313 |
|
| CX01 | Expiry of patent term |