CN102820655A - Control method of voltage support and fault current limit compatible power electronic system - Google Patents
Control method of voltage support and fault current limit compatible power electronic system Download PDFInfo
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- CN102820655A CN102820655A CN2012103359229A CN201210335922A CN102820655A CN 102820655 A CN102820655 A CN 102820655A CN 2012103359229 A CN2012103359229 A CN 2012103359229A CN 201210335922 A CN201210335922 A CN 201210335922A CN 102820655 A CN102820655 A CN 102820655A
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Abstract
The invention discloses a control method of a voltage support and fault current limit compatible power electronic system, relating to the voltage support and fault current limit compatible power electronic system. The voltage support and fault current limit compatible power electronic system comprises a power supply, a coupling transformer, a switching tube, a dynamic voltage recover, a short circuit current detection circuit, a controller, a current limit inductor and a load, wherein the dynamic voltage recover comprises a rectification bridge, a reversion bridge and a filter device, which are sequentially connected, the output of the dynamic voltage recover is connected with a secondary side of the coupling transformer through the switching tube, and a primary side of the coupling transformer is connected with the current limiting inductor in parallel and then is connected with a nonlinear loader in series so to be connected with a power grid. According to the control method of the voltage support and fault current limit compatible power electronic system, disclosed by the invention, by utilizing quick current limit performance of a fault current limiter and combining continuous compensating voltage fluctuation performance of the dynamic voltage recover, the utilization rate of a device is higher, the economic performance is better, and the defects when the fault current limiter and the dynamic voltage recover are singly used are prevented.
Description
Technical field
The present invention relates to a kind of efficient electrical power electronic system and control method thereof 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 universal day by day, the key factor that electric energy has become and the human being's production life is closely bound up.And along with the intensification of power consumer to the degree of dependence of electric energy, and industrial development is to producing requirement, also receives increasing attention gradually for the concern of the quality of power supply.In many power quality problems, voltage sag takes place the most frequently, loss is the most serious.This fault possibly cause the confession converting equipment in the electric power system, the damage of power consumption equipment, jeopardizes the normal safe and stable operation of electric power system, influences user's ordinary production, life activity.For addressing this problem, the device that suppresses voltage sag is had higher requirement: limiting short-circuit current fast in the time of voltage sag that can compensation network.And more existing devices exist not enough: normal at present 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.Though the effectively bucking voltage fluctuation of this device, for the DVR of tandem type, its lasting time of compensation drop-off voltage receives the capacity limit of dc energy storage device, and for the DVR of connection in series-parallel type, its cost is higher and floor space is big.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
take place 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 by this invention is to the prior art deficiency, a kind of power electronic system control method of taking into account voltage support and failure current limit to be provided, the 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 present invention adopted is: a kind of power electronic system control method 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 said 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, and said dynamic electric voltage recovery device comprises rectifier bridge, inverter bridge and the filter that connects successively, and rectifier bridge is connected with power supply; Power supply is connected with load through current-limiting inductance; Current-limiting inductance also inserts the former limit of coupling transformer, and coupling transformer is connected with filter through switching tube, the switching tube of controller control rectifier bridge and inverter bridge; Short-circuit current detection circuit is connected with switching tube between coupling transformer, the filter through drive circuit, and this method is:
A) detecting supply voltage
and currents
, inverter bridge DC bus voltage
, the load-side current
, dynamic voltage restorer output offset voltage
, and dynamic voltage restorer input current instantaneous value
;
2) according to detected load-side current value
; 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; Promptly
is 0; Then first drive circuit all breaks off the switching tube between dynamic electric voltage recovery device and the coupling transformer secondary; Second drive circuit all turn-offs the switching tube of the rectifier bridge part of dynamic electric voltage recovery device simultaneously, and the 3rd drive circuit all breaks off the switching tube of inverter bridge part, and dynamic electric voltage recovery device is out of service fully; If the voltage fluctuation fault appears in load-side; Short-circuit current detection circuit output high level; Promptly
is 1; Then first drive circuit makes the whole conductings of switching tube between dynamic electric voltage recovery device and the coupling transformer secondary; 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, get into 3);
3) according to sample voltage value
,
,
and current value
,
; Rule according to the expert reasoning judgement; Confirm the bucking voltage value of dynamic electric voltage recovery device; Give the dynamic electric voltage recovery device working signal through controller; 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 by second drive circuit and the 3rd drive circuit and give rectifier bridge and inverter bridge; 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.
Through the acting in conjunction of dynamic electric voltage recovery device and fault current limiter (current-limiting inductance and the switching tube of connecting), voltage real-Time Compensation and quick current limiting performance have been realized with coupling transformer.
Operation principle of the present invention is: the said 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, draw 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.Pwm signal by Intelligent treatment level (PI) controller and the comparison module of drive circuit sends is controlled the rectifier bridge and the voltage-type inverter bridge of execution level; When being short-circuited, work in the FCL pattern, when normal operation of load or generation voltage fluctuation, work in the DVR pattern.
Compared with prior art, the invention has the beneficial effects as follows: this system has increased fault current limiter on the basis of a DVR, when operate as normal is not short-circuited; This system works can compensate from the grid side voltage fluctuation, when working in short-circuit condition in the DVR pattern; 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 the rectifier bridge of second drive circuit and the 3rd drive circuit sealing simultaneously inverter bridge, and DVR is out of service fully; The series transformer secondary side is equivalent to open circuit; Impedance is very big, and 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, can improve the antijamming capability of system, have better dynamic compensation characteristic and control precision.
Description of drawings
Fig. 1 is the topological structure sketch map of conventional dynamic voltage restorer;
Voltage supports Fig. 2 and the power electronic system structural representation of failure current limit for one embodiment of the invention is taken into account;
Fig. 3 is one embodiment of the invention voltage-tracing control structure sketch map;
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 is taken 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 said 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 through current-limiting inductance; Current-limiting inductance also inserts the former limit of coupling transformer; Coupling transformer is connected with filter through switching tube, and controller is controlled the switching tube of rectifier bridge and inverter bridge respectively through second drive circuit, the 3rd drive circuit, and short-circuit current detection circuit passes through first drive circuit and is connected with switching tube between coupling transformer, the filter.
Take into account the efficient electrical power electronic system and the control method of voltage support and failure current limit, may further comprise the steps:
1) detects the single phase poaer supply voltage and current; Dc capacitor voltage; The load-side electric current; Input current instantaneous value
and
of DVR output bucking voltage and DVR;
;
;
and
;
2) according to detected load-side current value
; 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; Promptly
is 0; Then first drive circuit all breaks off the switching tube between dynamic electric voltage recovery device (DVR) and the coupling transformer secondary; Second drive circuit all turn-offs the switching tube of the rectifier bridge part of DVR simultaneously, and the 3rd drive circuit all breaks off the switching tube of inverter bridge part, and DVR is out of service fully; If the voltage fluctuation fault appears in load-side; Short-circuit current detection circuit output high level; Promptly
is 1; Then first drive circuit makes the whole conductings of switching tube between DVR and the coupling transformer secondary; Second drive circuit and the 3rd drive circuit make DVR be operated in the voltage compensation state, and DVR puts into operation, get into 3);
3),, confirm the bucking voltage value of DVR according to the rule that expert reasoning is judged according to sampled voltage, current value.Give the DVR working signal of execution level through decision-making treatment level Expert Controller (dsp controller); The bucking voltage set-point of DVR is provided simultaneously, and DVR produces rectifier bridge and the inverter bridge that pwm signal is given execution level according to its given reference signal value by 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), voltage real-Time Compensation and quick current limiting performance have efficiently been realized cheaply through the acting in conjunction of DVR and fault current limiter.
Said first drive circuit, second drive circuit, the 3rd drive circuit are the photoelectricity 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 is arranged; Secondary is in series with full-control type device (switching tube); Play FCL, and the energy storage device of DVR employing fully controlled bridge rectifier system, the input of rectifier bridge is from electrical network.Short-circuit current detection circuit is connected with first drive circuit, the switching tube between the first driving circuit drives DVR outlet side and the series coupled transformer.Big capacitance voltage of the DC side of DVR inverter bridge
and DVR output bucking voltage are sent into dsp controller, after calculating, provide the rectifier bridge of DVR and the switching tube PWM drive signal of inverter bridge.DVR can suppress the voltage fluctuation from grid side, and the FCL device can limit short circuit, is the current limiting system of invention.
Referring to Fig. 3, the voltage-tracing control circuit all adopts the triangular wave manner of comparison.For inverter bridge; Command signal
is made deviation with actual supply voltage
; The deviate that obtains is done deviation after pi regulator with DVR output voltage
again; Again through comparing with triangular wave after the amplitude limiter; Through output pwm signal after the comparator, thus the switching tube of control inverter bridge; For rectifier bridge; Command signal
is done to multiply by and the synchronous sinusoidal signal of voltage afterwards through warp one amplitude limiter after the pi regulator after the deviation with actual capacitance voltage value
, has just obtained the sinusoidal command signal
of alternating current.The difference that this command signal and actual AC signal obtain after is relatively made comparisons with triangular wave after an amplitude limiter through pi regulator then, output pwm signal after a comparator again, thus control the switching tube of 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 by secondary current instrument transformer, A/D sampling module, comparator successively; Primary current instrument transformer, sensing module, control module connect successively, and power module is connected with sensing module, control module, and control module adopts single-chip microcomputer.Can the big current signal on the power line be transformed to the voltage signal that is fit to the amplifier use through primary current instrument transformer and secondary current instrument transformer.This voltage signal and big current signal proportion relation.Then voltage signal being sent into the A/D sample circuit samples; And be converted into digital signal, compare with the reference voltage signal that digital regulation resistance provides then, after the signal (low level) after comparing triggers singlechip interruption; Its inside can be through timer control; 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 breaks off; Seal the drive signal of inverter IGBT simultaneously; Make inverter out of service, 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.At this moment, because the input of current-limiting inductance, short circuit current descends.
Claims (5)
1. take into account that voltage supports and the power electronic system control method of failure current limit for one kind; Comprise the power electronic system of taking into account voltage support and failure current limit; The said 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, and said 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 through current-limiting inductance, and current-limiting inductance also inserts the former limit of coupling transformer, and coupling transformer is connected with filter through switching tube; Controller is controlled the switching tube of rectifier bridge and inverter bridge respectively through second drive circuit, the 3rd drive circuit; Short-circuit current detection circuit is connected with switching tube between coupling transformer, the filter through first drive circuit, it is characterized in that this method is:
A) detecting supply voltage
and currents
, inverter bridge DC bus voltage
, the load-side current
, dynamic voltage restorer output offset voltage
and Dynamic Voltage Restorer instantaneous value of the input current
;
2) according to detected load-side current value
; 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; Promptly
is 0; Then first drive circuit all breaks off the switching tube between dynamic electric voltage recovery device and the coupling transformer secondary; 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 breaks off the switching tube of inverter bridge part, and dynamic electric voltage recovery device is out of service fully; If the voltage fluctuation fault appears in load-side; Short-circuit current detection circuit output high level; Promptly
is 1; Then first drive circuit makes the whole conductings of switching tube between dynamic electric voltage recovery device and the coupling transformer secondary; 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, get into 3);
3) according to sample voltage value
,
,
and current value
,
; Rule according to the expert reasoning judgement; Confirm the bucking voltage value of dynamic electric voltage recovery device; Give the dynamic electric voltage recovery device working signal through controller; 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 by second drive circuit and the 3rd drive circuit and give rectifier bridge and inverter bridge; 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.
2. the power electronic system control method of taking into account voltage support and failure current limit according to claim 1 is characterized in that said controller is a dsp controller.
3. the power electronic system control method of taking into account voltage support and failure current limit according to claim 1; It is characterized in that; Said short-circuit current detection circuit comprises primary current instrument transformer, sensing module, control module, power module; Sensing module is connected and composed by secondary current instrument transformer, A/D sampling module, comparator successively, and 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 of taking into account voltage support and failure current limit according to claim 3 is characterized in that said control module is a single-chip microcomputer.
5. the power electronic system control method of taking into account voltage support and failure current limit according to claim 1 and 2 is characterized in that said first drive circuit, second drive circuit, the 3rd drive circuit are the photoelectricity coupling drive circuit.
Priority Applications (1)
| 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 |
Applications Claiming Priority (1)
| 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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| Publication Number | Publication Date |
|---|---|
| CN102820655A true CN102820655A (en) | 2012-12-12 |
| CN102820655B CN102820655B (en) | 2015-08-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210335922.9A Expired - Fee Related 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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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208339A (en) * | 2016-07-20 | 2016-12-07 | 合肥联信电源有限公司 | A kind of compensation motor DC-BANK |
| 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 |
| 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 |
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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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2012
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| US20080315684A1 (en) * | 2007-06-25 | 2008-12-25 | The Hong Kong Polytechnic University | Square-wave modulated voltage dip restorer |
| CN101807799A (en) * | 2010-04-27 | 2010-08-18 | 天津大学 | Super capacitor energy storage type power quality compensator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208339A (en) * | 2016-07-20 | 2016-12-07 | 合肥联信电源有限公司 | A kind of compensation motor DC-BANK |
| 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 |
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| CN102820655B (en) | 2015-08-12 |
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