CN102820655B - A kind of power electronic system control method taking into account voltage support and failure current limit - Google Patents
A kind of power electronic system control method taking into account voltage support and failure current limit Download PDFInfo
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- CN102820655B CN102820655B CN201210335922.9A CN201210335922A CN102820655B CN 102820655 B CN102820655 B CN 102820655B CN 201210335922 A CN201210335922 A CN 201210335922A CN 102820655 B CN102820655 B CN 102820655B
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Abstract
The invention discloses a kind of power electronic system control method taking into account voltage support and failure current limit, comprise the power electronic system taking into account voltage support and failure current limit, the described power electronic system 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 connected successively, inverter bridge and filter, the output of dynamic electric voltage recovery device connects the secondary of coupling transformer through switching tube, the former limit of coupling transformer with connect with nonlinear load again after current-limiting inductance parallel connection after receive in electrical network.The present invention utilizes the performance of the quick current-limiting performance of fault current limiter the Continuous Compensation voltage fluctuation in conjunction with dynamic electric voltage recovery device, makes the utilance of equipment higher, and economy is better, overcomes the deficiency being used alone fault current limiter and dynamic electric voltage recovery device.
Description
Technical field
The present invention relates to a kind of efficient electrical power electronic system and the control method thereof of taking into account voltage support and failure current limit.
Background technology
Along with electric power system scale expand gradually and that power equipment uses is day by day universal, electric energy has become closely bound up key factor of living with human being's production.And along with power consumer is to the intensification of the degree of dependence of electric energy, and industrial development is to production requirement, the concern for the quality of power supply is also subject to increasing attention gradually.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 electric power system, jeopardizes the stable operation of electric power system normal safe, affects the normal production of user, life activity.For addressing this problem, have higher requirement to suppressing the device of voltage sag: can also limiting short-circuit current fast while the voltage sag of compensation network.And more existing device Shortcomings: that often adopt at present for voltage sag problem is dynamic electric voltage recovery device DVR, and the DVR be used alone has tandem type and connection in series-parallel mixed type.Although this device can effective bucking voltage fluctuation, for the DVR of tandem type, it compensates the capacity limit that time that drop-off voltage continues is subject to DC energy storage device, and for the DVR of Serial-Parallel Type, and its cost is compared with high and floor space is large.And when load-side is short-circuited time, the DVR of two profiles formula effectively can not suppress short circuit current.Be illustrated in figure 1 the DVR of parallel connection type, its operation principle is: when grid side voltage
occur voltage temporarily by time, DVR injects the controlled bucking voltage of an amplitude, phase place in circuit, with guaranteed load voltage stabilization.
Summary of the invention
Technical problem to be solved by this invention is, not enough for prior art, provides a kind of power electronic system control method taking into account voltage support and failure current limit, reduces electric energy loss and the installation cost of low-voltage network, realizes the optimization in economy and effect.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of power electronic system control method taking into account voltage support and failure current limit, comprise the power electronic system taking into account voltage support and failure current limit, the described power electronic system 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 connected 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, controller controls the switching tube of rectifier bridge and inverter bridge, short-circuit current detection circuit is by drive circuit and coupling transformer, switching tube between filter connects, the method is:
1) supply voltage is detected
and electric current
, inverter bridge DC capacitor voltage
, load-side electric current
, dynamic electric voltage recovery device export bucking voltage
and the input current instantaneous value of dynamic electric voltage recovery device
;
2) according to the load-side current value detected
, short-circuit current detection circuit judges whether load-side occurs short trouble, and exports corresponding switching signal
; If there is short circuit in load-side, short-circuit current detection circuit output low level, namely
be 0, then the first drive circuit makes the switching tube between dynamic electric voltage recovery device and coupling transformer secondary all disconnect, second drive circuit makes the switching tube of the rectifier bridge part of dynamic electric voltage recovery device all turn off simultaneously, 3rd drive circuit makes the switching tube of inverter bridge part all disconnect, and dynamic electric voltage recovery device is completely out of service; If voltage fluctuation fault appears in load-side, short-circuit current detection circuit exports high level, namely
be 1, then the first drive circuit makes the whole conducting of the switching tube between dynamic electric voltage recovery device and coupling transformer secondary, second drive circuit and the 3rd drive circuit make dynamic electric voltage recovery device be operated in voltage compensation state, and dynamic electric voltage recovery device puts into operation, enters 3);
3) according to sample voltage value
,
,
and current value
,
according to the rule that expert reasoning judges, determine the bucking voltage value of dynamic electric voltage recovery device, by controller to 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, pwm signal is produced to rectifier bridge and inverter bridge by the second drive circuit and the 3rd drive circuit, DC capacitor voltage is fed back simultaneously, coating-forming voltage inner loop feedback, the Voltage Feedback that inverter bridge exports is returned, forms independently outer shroud Voltage Feedback.
By the acting in conjunction of dynamic electric voltage recovery device and fault current limiter (current-limiting inductance and the switching tube of connecting with coupling transformer), achieve voltage real-Time Compensation and quick current-limiting performance.
Operation principle of the present invention for: described in take into account voltage support and failure current limit efficient electrical power electronic system comprise dynamic electric voltage recovery device DVR and fault current limiter FCL.According to system real time data, drawn the decision informations such as the control model of the short circuit current signal of the voltage that DVR will compensate and restriction by expert reasoning judging unit.The pwm signal sent by Intelligent treatment level (PI) controller and the comparison module of drive circuit controls the rectifier bridge of execution level and voltage-type inverter bridge; When a short circuit occurs, work in FCL pattern, when load normally runs or voltage fluctuation occurs, work in DVR pattern.
Compared with prior art, the invention has the beneficial effects as follows: this system adds fault current limiter on the basis of a DVR, when normal work is not short-circuited, this system works is in DVR pattern, can compensate from grid side voltage fluctuation, when working in short-circuit condition, first drive circuit can send cut-off signal to the wholly-controled device being series at coupling transformer secondary, the triggering signal of rectifier bridge inverter bridge closed by second drive circuit and the 3rd drive circuit simultaneously, DVR is completely out of service, 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, based on the control method of Voltage Feedback, the antijamming capability of system can be improved, there is good dynamic compensation characteristic and control precision.
Accompanying drawing explanation
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 one embodiment of the invention takes into account voltage support and failure current limit;
Fig. 3 is one embodiment of the invention voltage-tracing control structure schematic diagram;
Fig. 4 is one embodiment of the invention short-circuit current detection circuit structural representation.
Embodiment
As shown in Figure 2, the power electronic system that one embodiment of the invention takes 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, and described dynamic electric voltage recovery device comprises the rectifier bridge, inverter bridge and the filter that connect 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 controls the switching tube of rectifier bridge and inverter bridge respectively by the second drive circuit, the 3rd drive circuit, and short-circuit current detection circuit is connected with the switching tube between coupling transformer, 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, comprise the following steps:
1) the input current instantaneous value of single phase poaer supply voltage and current, DC capacitor voltage, load-side electric current, DVR output bucking voltage and DVR is detected
with
;
;
;
with
;
2) according to the load-side current value detected
, short-circuit current detection circuit judges whether load-side occurs short trouble, and exports corresponding switching signal
; If there is short circuit in load-side, short-circuit current detection circuit output low level, namely
be 0, then the first drive circuit makes the switching tube between dynamic electric voltage recovery device (DVR) and coupling transformer secondary all disconnect, second drive circuit makes the switching tube of the rectifier bridge part of DVR all turn off simultaneously, 3rd drive circuit makes the switching tube of inverter bridge part all disconnect, and DVR is completely out of service; If voltage fluctuation fault appears in load-side, short-circuit current detection circuit exports high level, namely
be 1, then the first drive circuit makes the whole conducting of the switching tube between DVR and coupling transformer secondary, and the second drive circuit and the 3rd drive circuit make DVR be operated in voltage compensation state, and DVR puts into operation, enters 3);
3) according to sampled voltage, current value, the rule judged according to expert reasoning, determines the bucking voltage value of DVR.By decision-making treatment level Expert Controller (dsp controller) to the DVR working signal of execution level, the bucking voltage set-point of DVR is provided simultaneously, DVR is according to its given reference signal value, pwm signal is produced to the rectifier bridge of execution level and inverter bridge by the second drive circuit and the 3rd drive circuit, DC capacitor voltage is fed back simultaneously, coating-forming voltage inner loop feedback, returns the Voltage Feedback that inverter exports, forms independently outer shroud Voltage Feedback.
4) by the acting in conjunction of DVR and fault current limiter, efficient voltage real-Time Compensation and the quick current-limiting performance of low cost is achieved.
Described first drive circuit, the second drive circuit, the 3rd drive circuit are photoelectric coupling drive circuit.
The present invention is on the basis of an original device of DVR and function, on the former limit of the series coupled transformer of DVR series inverter and current limiting inductance, secondary is in series with wholly-controled device (switching tube), play FCL, and the energy storage device of DVR adopts 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 series coupled transformer.The DC side bulky capacitor voltage of DVR inverter bridge
export bucking voltage with DVR and send into dsp controller, provide the rectifier bridge of DVR and the switching tube PWM drive singal of inverter bridge as calculated afterwards.DVR can suppress the voltage fluctuation from grid side, and FCL device can limit short circuit, is the current limiting system of invention.
See Fig. 3, voltage-tracking control circuit all adopts triangle wave mode.For inverter bridge, command signal
with the supply voltage of reality
make deviation, the deviate obtained again with DVR output voltage
do deviation after pi regulator, then after an amplitude limiter and triangle wave, by output pwm signal after comparator, thus control the switching tube of inverter bridge; For rectifier bridge, command signal
with the capacitance voltage value of reality
through pi regulator after, after an amplitude limiter, be multiplied by the sinusoidal signal with voltage in phase after making deviation, just obtain 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 through pi regulator after an amplitude limiter, then after a comparator output pwm signal, thus control the switching tube of rectifier bridge.
See 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.Big current signal on power line can be transformed to the voltage signal of applicable amplifier use by primary current instrument transformer and secondary current instrument transformer.This voltage signal and big current signal proportion relation.Then voltage signal is sent into A/D sample circuit to sample, and be converted into digital signal, then the reference voltage signal provided with digital regulation resistance compares, after signal (low level) relatively triggers singlechip interruption, its inside is by Timer Controlling, and timing scans interrupt pin, once interrupt, single-chip microcomputer then exports control signal (high level) and goes to control special executive circuit.The level signal now produced drives the full control device of series coupled transformer secondary series connection to disconnect, close the drive singal of inverter IGBT simultaneously, make inverter out of service, 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.Now, due to the input of current-limiting inductance, short circuit current declines.
Claims (5)
1. take into account the power electronic system control method of voltage support and failure current limit for one kind, comprise the power electronic system taking into account voltage support and failure current limit, the described power electronic system 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, and described dynamic electric voltage recovery device comprises the rectifier bridge, inverter bridge and the filter that connect 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 A, controller controls the switching tube B of rectifier bridge and the switching tube C of inverter bridge respectively by the second drive circuit, the 3rd drive circuit, short-circuit current detection circuit is connected with the switching tube A between coupling transformer, filter by the first drive circuit, and it is characterized in that, the method is:
1) supply voltage is detected
and electric current
, inverter bridge DC capacitor voltage
, load-side electric current
, dynamic electric voltage recovery device export bucking voltage
and the input current instantaneous value of dynamic electric voltage recovery device
;
2) according to the load-side current value detected
, short-circuit current detection circuit judges whether load-side occurs short trouble, and exports corresponding switching signal
; If there is short circuit in load-side, short-circuit current detection circuit output low level, namely
be 0, then the first drive circuit makes the switching tube A between dynamic electric voltage recovery device and coupling transformer secondary all disconnect, second drive circuit makes the switching tube B of the rectifier bridge part of dynamic electric voltage recovery device all turn off simultaneously, 3rd drive circuit makes the switching tube C of inverter bridge part all disconnect, and dynamic electric voltage recovery device is completely out of service; If voltage fluctuation fault appears in load-side, short-circuit current detection circuit exports high level, namely
be 1, then the first drive circuit makes the whole conducting of switching tube A between dynamic electric voltage recovery device and coupling transformer secondary, second drive circuit and the 3rd drive circuit make dynamic electric voltage recovery device be operated in voltage compensation state, and dynamic electric voltage recovery device puts into operation, enters 3);
3) according to sample voltage value
,
,
and current value
,
according to the rule that expert reasoning judges, determine the bucking voltage value of dynamic electric voltage recovery device, by controller to 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, pwm signal is produced to rectifier bridge and inverter bridge by the second drive circuit and the 3rd drive circuit, DC capacitor voltage is fed back simultaneously, coating-forming voltage inner loop feedback, the Voltage Feedback that inverter bridge exports is returned, forms independently outer shroud Voltage Feedback.
2. the power electronic system control method 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 control method 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 control method 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 control method taking into account voltage support and failure current limit according to claim 1 and 2, is characterized in that, described first drive circuit, the second drive circuit, the 3rd drive circuit are photoelectric coupling drive circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210335922.9A CN102820655B (en) | 2012-09-12 | 2012-09-12 | A kind of power electronic system control method taking into account voltage support and failure current limit |
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| CN201210335922.9A CN102820655B (en) | 2012-09-12 | 2012-09-12 | A kind of power electronic system control method taking into account voltage support and failure current limit |
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| CN102820655B true CN102820655B (en) | 2015-08-12 |
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| CN106208339B (en) * | 2016-07-20 | 2019-04-12 | 合肥联信电源有限公司 | A kind of compensation motor anti-swing electrical system |
| CN107785908A (en) * | 2016-08-24 | 2018-03-09 | 中电普瑞科技有限公司 | A kind of dynamic electric voltage recovery device with short circuit current limitation function |
| CN107453367A (en) * | 2017-09-04 | 2017-12-08 | 国网江苏省电力公司扬州供电公司 | A kind of seven level dynamic voltage recovery devices based on active-clamp current transformer |
Citations (1)
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|---|---|---|---|---|
| CN101807799A (en) * | 2010-04-27 | 2010-08-18 | 天津大学 | Super capacitor energy storage type power quality compensator |
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| US20080315684A1 (en) * | 2007-06-25 | 2008-12-25 | The Hong Kong Polytechnic University | Square-wave modulated voltage dip restorer |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807799A (en) * | 2010-04-27 | 2010-08-18 | 天津大学 | Super capacitor energy storage type power quality compensator |
Non-Patent Citations (3)
| Title |
|---|
| 可连续补偿的动态电压恢复器研究;吴卫兵等;《冶金设备》;20070630;第46-48、72页 * |
| 并联型电网短路限流多目标控制;甄晓亚等;《华东电力》;20110731;第39卷(第7期);第1109-1112页 * |
| 连续型动态电压恢复器的研究;信家男;《中国优秀硕士学位论文全文数据库》;20120515;第59-67页 * |
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