CN104237670A - Three-level PWM converter detection system and method - Google Patents
Three-level PWM converter detection system and method Download PDFInfo
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- CN104237670A CN104237670A CN201410273503.6A CN201410273503A CN104237670A CN 104237670 A CN104237670 A CN 104237670A CN 201410273503 A CN201410273503 A CN 201410273503A CN 104237670 A CN104237670 A CN 104237670A
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Abstract
The invention discloses a three-level PWM converter detection system and method. The system comprises a first direct current capacitor bank, a first converter, a first electric reactor, a first coulometric detector, a first controller, a second direct current capacitor bank, a second electric reactor, a second controller and a second coulometric detector. A converter to be detected is connected with the second electric reactor and the second direct current capacitor bank. Full-load detection and aging test are achieved by controlling the converter to be detected to output reactive current with the rated value. Meanwhile, the first converter carries out in-place compensation on reactive loads and harmonic waves produced by other loads in a plant and the converter to be detected, so that the problem about reactive current and harmonic wave current is solved inside the system of the plant, and finally the purposes of saving electric energy, improving the electric energy quality and reducing the product cost are achieved.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly relate to three-level pwm transducer detection system and method.
Background technology
Three-level pwm transducer obtains a wide range of applications at power domain, as the DC/AC transducer in grid-connected photovoltaic system, the DC/AC transducer in wind generator system, low voltage frequency converter, electric power electric transformer, microgrid accumulator system transducer etc.
The factory inspection of three-level pwm transducer generally includes functional test, at full capacity band and carries test and aging test etc.Especially, band year test and aging test are very important Interventions Requested at full capacity, usual employing blower fan, resistance and reactance etc. are as test load, need to consume a large amount of electric energy, comprise active energy and reactive energy, and commercial power unit price is relatively high, concerning manufacturer, the electricity charge are no small cost burdens.
In addition, an inside plants, usually will carry out various scientific research and testing, product export test, the quality of power supply of plant area inside receives much concern, as less than normal in power factor, voltage fluctuation is excessive, may cannot meet the requirement of Utilities Electric Co. to relevant power consumption index.
Summary of the invention
The invention provides three-level pwm transducer detection system and method, to solve the technical matters that in prior art, three-level pwm transducer factory testing power consumption is high, the object reach energy efficiency, reducing costs, effectively can also improve the inner quality of power supply of plant area simultaneously.
In order to solve the problems of the technologies described above, detection system of the present invention is by the following technical solutions: three-level pwm transducer detection system comprises: the first coulometric detector, the first transducer, the first controller, second controller and the second coulometric detector, and wherein the first transducer is the idle and harmonic compensator of detection system work electrical network; Measurement result for measuring electric current and the voltage of detection system work electrical network, and is transferred to the first controller by described first coulometric detector; Measurement result for measuring working current and the line voltage of three-level pwm transducer to be detected, and is transferred to second controller by described second coulometric detector;
Described first controller according to the measurement result of the first coulometric detector, the in real time reactive current that exports of adjustment first transducer, thus control that detection system reactive current equals 0, power factor equals 1;
Described second controller is according to the measurement result of the second coulometric detector, carry out closed-loop control respectively to the reactive current of three-level pwm transducer to be detected and DC bus-bar voltage, the reactive current that three-level pwm transducer to be detected is exported and DC bus-bar voltage reach default ratings respectively.
Preferably, described detection system also comprises: the first reactor and the second reactor; One end of first reactor is connected with the input end of described first transducer, and one end is connected with the three-phase bus of detection system work electrical network in addition; One end of second reactor is connected with the input end of described three-level pwm transducer to be detected, and one end is connected with the three-phase bus of detection system work electrical network in addition.
Preferably, described detection system also comprises: the first direct current capacitors group and the second direct current capacitors group; Described first direct current capacitors group is connected with the DC side of the first transducer; Described second direct current capacitors group is connected with the DC side of three-level pwm transducer to be detected.
Preferably, described first controller comprises DSP and simulating signal pre-process circuit, and DSP is connected with the first transducer and simulating signal pre-process circuit respectively, and simulating signal pre-process circuit is connected with the first coulometric detector, the first direct current capacitors group respectively; The detection signal of described first coulometric detector and the detection signal of the first direct current capacitors group are by carrying out AD sampling by DSP after the process of simulating signal pre-process circuit; DSP carries out producing PWM drive singal after SPWM calculates according to AD sampled result and outside input instruction and controls the first transducer.
Described first controller also comprises CPLD and photoelectric isolating circuit, and CPLD is connected with DSP and photoelectric isolating circuit respectively, and photoelectric isolating circuit is connected with simulating signal pre-process circuit and CPLD respectively; When having fault, warning or input voltage zero passage to occur, simulating signal pre-process circuit exports corresponding level signal and after photoelectric isolating circuit, enters CPLD again; CPLD encodes to described level signal, store to be read by DSP and to go forward side by side row relax.
Preferably, described second controller comprises DSP and simulating signal pre-process circuit, DSP is connected with three-level pwm transducer to be detected and simulating signal pre-process circuit respectively, and simulating signal pre-process circuit is connected with the second coulometric detector, the second direct current capacitors group respectively; The detection signal of described second coulometric detector and the detection signal of the second direct current capacitors group are by carrying out AD sampling by DSP after the process of simulating signal pre-process circuit; DSP carries out producing PWM drive singal after SPWM calculates according to AD sampled result and outside input instruction and controls three-level pwm transducer to be detected.
Described second controller also comprises CPLD and photoelectric isolating circuit, and CPLD is connected with DSP and photoelectric isolating circuit respectively, and photoelectric isolating circuit is connected with simulating signal pre-process circuit and CPLD respectively; When having fault, warning or input voltage zero passage to occur, simulating signal pre-process circuit exports corresponding level signal and after photoelectric isolating circuit, enters CPLD again; CPLD encodes to described level signal, store to be read by DSP and to go forward side by side row relax.
In order to solve the problems of the technologies described above, detection method is by the following technical solutions: based on the three-level pwm transducer detection method of said detecting system, wherein the first direct current capacitors group, the second direct current capacitors group be respectively used to storage first transducer, three-level pwm transducer to be detected DC side energy and suppress the fluctuation of DC voltage; First controller, second controller control the first transducer, three-level pwm transducer to be detected respectively;
The control procedure of second controller to three-level pwm transducer to be detected is as follows:
A1, the current signal detected according to the second coulometric detector carry out 3s/2r conversion, obtain the reactive current actual value I that three-level pwm transducer to be detected exports
d2with active current actual value I
q2;
The reactive current reference value I of A2, given three-level pwm transducer to be detected
dref2with direct voltage reference value U
dcref2;
A3, to the given direct voltage reference value U of three-level pwm transducer to be detected
dcref2with actual the second direct current capacitors group voltage U detected
dc2relatively carry out PI adjustment, obtain three-level pwm transducer active current reference value I to be detected
qref2;
A4, respectively to the reactive current reference value I of three-level pwm transducer to be detected
dref2with reactive current actual value I
d2, active current reference value I
qref2with active current actual value I
q2relatively carry out PI adjustment, obtain d
qpWM ripple reference value U under coordinate system
dref2and U
qref2;
A5, to U
dref2and U
qref2carry out 2r/3s conversion and obtain PWM ripple reference value U under abc coordinate system
aref2, U
bref2and U
cref2;
A6, obtain the pwm signal needed for three-level pwm transducer to be detected according to SPWM algorithm, export to three-level pwm transducer to be detected;
The control procedure of the first controller to the first transducer is as follows:
B1, the current signal detected according to the first coulometric detector carry out 3s/2r conversion, obtain the reactive current actual value I of detection system work electrical network
d1with active current actual value I
q1;
The reactive current reference value I of B2, given first transducer
dref1=0 and direct voltage reference value U
dcref1;
B3, to the given direct voltage reference value U of the first transducer
dcref1with actual the first direct current capacitors group voltage U detected
dc1relatively carry out PI adjustment, obtain the first transducer active current reference value I
qref1;
B4, respectively to the first transducer reactive current reference value I
dref1with reactive current actual value I
d1, active current reference value I
qref1with active current actual value I
q1relatively carry out PI adjustment, obtain d
qpWM ripple reference value U under coordinate system
dref1and U
qref1;
B5, to U
dref1and U
qref1carry out 2r/3s conversion and obtain PWM ripple reference value U under abc coordinate system
aref1, U
bref1and U
cref1;
B6, obtain the pwm signal needed for the first transducer according to SPWM algorithm, export to the first transducer.
Compared with prior art, tool of the present invention has the following advantages or beneficial effect:
The present invention adopts the transducer that detected as the total idle and harmonic compensator of plant area's electrical network, and this transducer detected is in running order all the time, has the function of output reactive power and harmonic compensation.The present invention is by controlling transducer to be detected, thus output size is the reactive current of load current value, realizes detecting at full capacity and aging test; Simultaneously, the transducer detected carries out local compensation to the load or burden without work that other loads in transducer to be detected and factory produce, reactive current is resolved in plant area's internal system, the object finally reaching saves energy, improve the quality of power supply, reduce cost of products, solves in existing detection technique and adopts blower fan, resistance or reactance to cause the technical matters that power consumption is high as test load.
Accompanying drawing explanation
Fig. 1 is conventional three-level pwm transducer;
Fig. 2 is embodiment of the present invention three-level pwm transducer detection system schematic diagram;
Fig. 3 is the hardware structure diagram of the first controller or second controller in the embodiment of the present invention;
Fig. 4 is the control flow chart of three-level pwm transducer to be detected in the embodiment of the present invention;
Fig. 5 is the control flow chart having detected three-level pwm transducer in the embodiment of the present invention;
Fig. 6 is the active power of embodiment of the present invention detection system, reactive power flows to schematic diagram.
Embodiment
Below in conjunction with embodiment and Figure of description, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
The present invention needs the circuit structure of the three-level pwm transducer detected as shown in Figure 1, comprises transducer and direct current capacitors group loop.
As shown in Figure 2, in the present embodiment, three-level pwm transducer detection system comprises: the first direct current capacitors group, the first transducer, the first reactor, the first switch, the first coulometric detector, the first controller, the second direct current capacitors group, the second coulometric detector, second controller and second switch.Described first direct current capacitors group is connected with the DC side of the first transducer, and the AC of described first transducer is connected with the first reactor, and described first reactor is connected with the three-phase bus of detection system work electrical network by the first switch; Described second reactor is connected by the three-phase bus of second switch with detection system work electrical network.First, second direct current capacitors group is respectively used to storage first transducer, the second transducer DC side energy and suppresses the fluctuation of DC voltage.First, second reactor is used for harmonic reduction to improve the input quality of power supply of the first transducer, the second transducer.
The circuit structure of first, second coulometric detector is identical, by voltage transformer (VT) and current Hall sensor composition, interconnected relationship is not had between described voltage transformer (VT) and described current Hall sensor, but independently work, be respectively used to detectable voltage signals and current signal; Described first coulometric detector is arranged on detection system work electrical network and external electrical network junction, and measure electric current and the voltage of whole detection system work electrical network, its measuring-signal enters the first controller; Described second coulometric detector is arranged on second switch and the second reactor junction, and measure working current and the line voltage of the second transducer, its measuring-signal enters second controller.The DC side of described second transducer is connected with the second direct current capacitors group, the AC of described second transducer and being connected of the second reactor.
First transducer is the transducer detected, and adopts three-level pwm transducer, and as the part of detection system, in running order all the time, there is the function of output reactive power and harmonic compensation; And the second transducer is three-level pwm transducer to be detected, it has four-quadrant function.
First controller and second controller have identical inner structure, as shown in Figure 3.First controller or second controller are primarily of the several part composition of DSP, CPLD, photoelectric isolating circuit, simulating signal pre-process circuit, switching value treatment circuit and man-machine interface, DSP is connected with transducer, CPLD, photoelectric isolating circuit, simulating signal pre-process circuit and man-machine interface respectively, photoelectric isolating circuit is connected with simulating signal pre-process circuit, CPLD and switching value treatment circuit respectively, simulating signal pre-process circuit is connected with coulometric detector, direct current capacitors group respectively, and DSP exports PWM drive singal to transducer.The detection signal (comprising current signal and voltage signal) of coulometric detector and the detection signal of direct current capacitors group are by carrying out AD sampling by DSP after the process of simulating signal pre-process circuit; When having warning or input voltage zero passage detection signal in simulating signal pre-process circuit, simulating signal pre-process circuit produces corresponding level signal by entering CPLD after photoelectric isolating circuit; If there is external switch signal to be inputted by switching value treatment circuit, then photoelectric isolating circuit also produces corresponding level signal and encodes to these level signals aforementioned to CPLD, CPLD, stores to be read by DSP timing and to go forward side by side row relax.When having fault-signal to produce in simulating signal pre-process circuit, fault-signal enters CPLD after Phototube Coupling, interrupt request is produced to DSP after CPLD failure judgement classification, DSP then responds this interruption at once and exports to stop PWM and send power switch trip command to CPLD, prevents transducer major loop from damaging; When DSP has detected that warning occurs, DSP has been sent to man-machine interface for recording and checking warning message; To carry out phase-locked to line voltage when DSP detects input voltage zero cross signal, realize four-quadrant function for transducer.Man-machine interface is mainly used to display and setup parameter, and its display realizes communicating with DSP by RS232 interface with the parameter of setting.DSP is according to AD sampled result and carry out producing PWM drive singal after SPWM calculates from the instruction of man-machine interface input and control transducer.
Second transducer, three-level pwm transducer namely to be detected, adopt decoupled active and reactive to control, given reactive current desired value is the rated current of this second transducer, and given DC bus-bar voltage desired value is the DC bus-bar voltage ratings of this second transducer; The testing result that second controller feeds back according to the second coulometric detector, carry out closed-loop control respectively to the reactive current of the second transducer and DC bus-bar voltage, the reactive current that three-level pwm transducer to be detected is exported and DC bus-bar voltage reach desired value respectively.As shown in Figure 4, the control procedure of second controller to three-level pwm transducer (i.e. the second transducer) to be detected is as follows:
A1, the current signal detected according to the second coulometric detector carry out 3s/2r conversion, obtain the reactive current actual value I that the second transducer exports
d2with active current actual value I
q2;
The reactive current reference value I of A2, given second transducer
dref2with direct voltage reference value U
dcref2;
A3, to the given direct voltage reference value U of the second transducer
dcref2with actual the second direct current capacitors group voltage U detected
dc2relatively carry out PI adjustment, obtain the second transducer active current reference value I
qref2;
A4, respectively to the second transducer reactive current reference value I
dref2with reactive current actual value I
d2, active current reference value I
qref2with active current actual value I
q2relatively carry out PI adjustment, obtain d
qpWM ripple reference value U under coordinate system
dref2and U
qref2;
A5, to U
dref2and U
qref2carry out 2r/3s conversion and obtain PWM ripple reference value U under abc coordinate system
aref2, U
bref2and U
cref2;
A6, obtain the pwm signal needed for the second transducer according to SPWM algorithm, export to the second transducer.
First controller detects electric current and the voltage of whole system by the first coulometric detector, real-time detection plant area power factor of electric network, and equal 0 to control detection system reactive current, power factor equals 1 for operational objective, the reactive current that described first transducer of adjustment in real time exports.As shown in Figure 5, the control procedure of the first controller to the three-level pwm transducer detected (i.e. the first transducer) is as follows:
B1, the current signal detected according to the first coulometric detector carry out 3s/2r conversion, obtain the reactive current actual value I of factory's net (i.e. whole detection system work electrical network)
d1with active current actual value I
q1;
The reactive current reference value I of B2, given first transducer
dref1=0 and direct voltage reference value U
dcref1;
B3, to the given direct voltage reference value U of the first transducer
dcref1with actual the first direct current capacitors group voltage U detected
dc1relatively carry out PI adjustment, obtain the first transducer active current reference value I
qref1;
B4, respectively to the first transducer reactive current reference value I
dref1with reactive current actual value I
d1, active current reference value I
qref1with active current actual value I
q1relatively carry out PI adjustment, obtain d
qpWM ripple reference value U under coordinate system
dref1and U
qref1;
B5, to U
dref1and U
qref1carry out 2r/3s conversion and obtain PWM ripple reference value U under abc coordinate system
aref1, U
bref1and U
cref1;
B6, obtain the pwm signal needed for the first transducer according to SPWM algorithm, export to the first transducer.
As shown in Figure 6, the active power of netting whole factory and reactive power flow to be analyzed.Suppose inside plants other loads except the first transducer and the second transducer, consume active-power P
2and reactive power Q
2; In order to detect at full capacity and aging test the second transducer to be detected, to control its reactive current be the reactive power that load current value consumes is Q
1(active power consumption is very little, ignores); First transducer equals 0 with control system reactive current, power factor equals 1 for operational objective, and the first transducer will inevitably send size for (Q
1+ Q
2) reactive power, to offset the reactive power (Q of the second transducer and other load consumptions
1+ Q
2), to reach the control objectives that system power factor is 1.So, factory's net finally from the size of only having of electrical network consumption be P
2active power, and this part of active power be all by the first transducer and the second transducer beyond other loads consumed, thus dexterously the energy consumption of three-level pwm transducer factory testing and aging test is dropped to minimum.
It should be noted that, three-level pwm transducer detection system involved by the embodiment of the present invention, except comprising device involved in embodiment, also comprise other devices known in those skilled in the art, in order to outstanding invention thought of the present invention, therefore, only the device relating to invention thought of the present invention is described in an embodiment of the present invention, other devices known in inverter is not added and repeats.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; other are any do not deviate from Spirit Essence of the present invention and principle under do amendment, modification, substitute, combination, to simplify; all should be the substitute mode of equivalence, all should be included within protection scope of the present invention.
Claims (9)
1. three-level pwm transducer detection system, it is characterized in that, described detection system comprises: the first coulometric detector, the first transducer, the first controller, second controller and the second coulometric detector, and wherein the first transducer is the idle and harmonic compensator of detection system work electrical network; Measurement result for measuring electric current and the voltage of detection system work electrical network, and is transferred to the first controller by described first coulometric detector; Measurement result for measuring working current and the line voltage of three-level pwm transducer to be detected, and is transferred to second controller by described second coulometric detector;
Described first controller according to the measurement result of the first coulometric detector, the in real time reactive current that exports of adjustment first transducer, thus control that detection system reactive current equals 0, power factor equals 1;
Described second controller is according to the measurement result of the second coulometric detector, carry out closed-loop control respectively to the reactive current of three-level pwm transducer to be detected and DC bus-bar voltage, the reactive current that three-level pwm transducer to be detected is exported and DC bus-bar voltage reach default ratings respectively.
2. detection system according to claim 1, is characterized in that, described detection system also comprises: the first direct current capacitors group and the second direct current capacitors group; Described first direct current capacitors group is connected with the DC side of the first transducer; Described second direct current capacitors group is connected with the DC side of three-level pwm transducer to be detected.
3. detection system according to claim 1, is characterized in that, described detection system also comprises: the first reactor and the second reactor; One end of first reactor is connected with the input end of described first transducer, and one end is connected with the three-phase bus of detection system work electrical network in addition; One end of second reactor is connected with the input end of described three-level pwm transducer to be detected, and one end is connected with the three-phase bus of detection system work electrical network in addition.
4. detection system according to claim 1, is characterized in that, described first transducer is three-level pwm transducer.
5. detection system according to claim 2, it is characterized in that, described first controller comprises DSP and simulating signal pre-process circuit, DSP is connected with the first transducer and simulating signal pre-process circuit, and simulating signal pre-process circuit is connected with the first coulometric detector, the first direct current capacitors group respectively;
The detection signal of described first coulometric detector and the detection signal of the first direct current capacitors group are by carrying out AD sampling by DSP after the process of simulating signal pre-process circuit; DSP carries out producing PWM drive singal after SPWM calculates according to AD sampled result and outside input instruction and controls the first transducer.
6. detection system according to claim 5, it is characterized in that, described first controller also comprises CPLD and photoelectric isolating circuit, and CPLD is connected with DSP and photoelectric isolating circuit respectively, and photoelectric isolating circuit is connected with simulating signal pre-process circuit and CPLD respectively;
When having fault, warning or input voltage zero passage to occur, simulating signal pre-process circuit exports corresponding level signal and after photoelectric isolating circuit, enters CPLD again; CPLD encodes to described level signal, store to be read by DSP and to go forward side by side row relax.
7. detection system according to claim 2, it is characterized in that, described second controller comprises DSP and simulating signal pre-process circuit, DSP is connected with three-level pwm transducer to be detected and simulating signal pre-process circuit respectively, and simulating signal pre-process circuit is connected with the second coulometric detector, the second direct current capacitors group respectively;
The detection signal of described second coulometric detector and the detection signal of the second direct current capacitors group are by carrying out AD sampling by DSP after the process of simulating signal pre-process circuit; DSP carries out producing PWM drive singal after SPWM calculates according to AD sampled result and outside input instruction and controls three-level pwm transducer to be detected.
8. detection system according to claim 7, it is characterized in that, described second controller also comprises CPLD and photoelectric isolating circuit, and CPLD is connected with DSP and photoelectric isolating circuit respectively, and photoelectric isolating circuit is connected with simulating signal pre-process circuit and CPLD respectively;
When having fault, warning or input voltage zero passage to occur, simulating signal pre-process circuit exports corresponding level signal and after photoelectric isolating circuit, enters CPLD again; CPLD encodes to described level signal, store to be read by DSP and to go forward side by side row relax.
9. based on the three-level pwm transducer detection method of detection system described in claim 2, it is characterized in that, the first direct current capacitors group, the second direct current capacitors group are respectively used to storage first transducer, the DC side energy of three-level pwm transducer to be detected and the fluctuation of suppression DC voltage; First controller, second controller control the first transducer, three-level pwm transducer to be detected respectively;
The control procedure of second controller to three-level pwm transducer to be detected is as follows:
A1, the current signal detected according to the second coulometric detector carry out 3s/2r conversion, obtain the reactive current actual value I that three-level pwm transducer to be detected exports
d2with active current actual value I
q2;
The reactive current reference value I of A2, given three-level pwm transducer to be detected
dref2with direct voltage reference value U
dcref2;
A3, to the given direct voltage reference value U of three-level pwm transducer to be detected
dcref2with actual the second direct current capacitors group voltage U detected
dc2relatively carry out PI adjustment, obtain three-level pwm transducer active current reference value I to be detected
qref2;
A4, respectively to the reactive current reference value I of three-level pwm transducer to be detected
dref2with reactive current actual value I
d2, active current reference value I
qref2with active current actual value I
q2relatively carry out PI adjustment, obtain d
qpWM ripple reference value U under coordinate system
dref2and U
qref2;
A5, to U
dref2and U
qref2carry out 2r/3s conversion and obtain PWM ripple reference value U under abc coordinate system
aref2, U
bref2and U
cref2;
A6, obtain the pwm signal needed for three-level pwm transducer to be detected according to SPWM algorithm, export to three-level pwm transducer to be detected;
The control procedure of the first controller to the first transducer is as follows:
B1, the current signal detected according to the first coulometric detector carry out 3s/2r conversion, obtain the reactive current actual value I of detection system work electrical network
d1with active current actual value I
q1;
The reactive current reference value I of B2, given first transducer
dref1=0 and direct voltage reference value U
dcref1;
B3, to the given direct voltage reference value U of the first transducer
dcref1with actual the first direct current capacitors group voltage U detected
dc1relatively carry out PI adjustment, obtain the first transducer active current reference value I
qref1;
B4, respectively to the first transducer reactive current reference value I
dref1with reactive current actual value I
d1, active current reference value I
qref1with active current actual value I
q1relatively carry out PI adjustment, obtain d
qpWM ripple reference value U under coordinate system
dref1and U
qref1;
B5, to U
dref1and U
qref1carry out 2r/3s conversion and obtain PWM ripple reference value U under abc coordinate system
aref1, U
bref1and U
cref1;
B6, obtain the pwm signal needed for the first transducer according to SPWM algorithm, export to the first transducer.
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| CN105528811A (en) * | 2015-12-30 | 2016-04-27 | 广州快速交通建设有限公司 | Multifunctional lane toll control system |
| CN107024614A (en) * | 2017-03-09 | 2017-08-08 | 广东创锐电子技术股份有限公司 | A kind of method of testing of charging pile voltage changer |
| CN107064699A (en) * | 2017-06-09 | 2017-08-18 | 上海逸伏汽车电子科技有限公司 | The ageing test apparatus of vehicle-mounted DC/DC converters |
| CN110062999A (en) * | 2016-12-09 | 2019-07-26 | 大金工业株式会社 | Active filter built-in device |
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