CN104237670B - Three-level PWM converter detection system and method - Google Patents
Three-level PWM converter detection system and method Download PDFInfo
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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, more particularly to three-level pwm converter detecting system and method.
Background technology
Three-level pwm converter is obtained a wide range of applications in power domain, such as the DC/AC in grid-connected photovoltaic system
DC/AC converters, low voltage frequency converter, electric power electric transformer, microgrid energy-storage system conversion in converter, wind generator system
Device etc..
Three-level pwm converter exfactory inspection generally includes functional test, the at full capacity test of band load and degradation etc..It is special
Not, it is very important inspection project that band carries test and degradation at full capacity, is generally made using blower fan, resistance and reactance etc.
For test load, it is necessary to consume substantial amounts of electric energy, including active energy and reactive energy, and commercial power unit price is relatively
Height, for manufacturer, the electricity charge are a no small cost burdens.
In addition, in an inside plants, generally to carry out various scientific research and testing, product export experiment, on-site
The quality of power supply in portion receives much concern, and such as power factor is less than normal, voltage pulsation is excessive, may cannot meet Utilities Electric Co. to correlation
The requirement of power consumption index.
The content of the invention
The present invention provides three-level pwm converter detecting system and method, is converted with solving three-level pwm in the prior art
Device factory testing power consumption technical problem high, reaches the purpose of energy efficiency, reduces cost, while factory can also be effectively improved
Area's internal electric energy quality.
In order to solve the above-mentioned technical problem, detecting system of the present invention uses following technical scheme：Three-level pwm converter is examined
Examining system includes：First coulometric detector, the first converter, the first controller, second controller and the second coulometric detector, its
In the first converter be detecting system work power network idle and harmonic compensator；First coulometric detector is used to measure to be examined
The electric current and voltage of examining system work power network, and measurement result is transferred to the first controller；Second coulometric detector is used
In the operating current and line voltage of measurement three-level pwm converter to be detected, and measurement result is transferred to second controller；
First controller is according to the measurement result of the first coulometric detector, the nothing of the converter of real-time adjustment first output
Work(electric current, so that controlling detecting system reactive current to be equal to 0, power factor is equal to 1；
The second controller according to the measurement result of the second coulometric detector, to three-level pwm converter to be detected
Reactive current and DC bus-bar voltage carry out closed-loop control respectively, make the reactive current of three-level pwm converter output to be detected
Default rated value is respectively reached with DC bus-bar voltage.
Preferably, the detecting system also includes：First reactor and the second reactor；One end of first reactor and institute
The input for stating the first converter is connected, and other end is connected with the three-phase bus of detecting system work power network；Second reactor
One end be connected with the input of the three-level pwm converter to be detected, the three of other end and detecting system work power network
Phase bus is connected.
Preferably, the detecting system also includes：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 converter；The second direct current capacitors group becomes with three-level pwm to be detected
The DC side of parallel operation is connected.
Preferably, first controller include DSP and analog signal pretreatment circuit, DSP respectively with the first converter
And analog signal pretreatment circuit connection, analog signal pretreatment circuit respectively with the first coulometric detector, the first DC capacitor
Device group is connected；The detection signal of the detection signal of first coulometric detector and the first direct current capacitors group is believed by simulating
Number pretreatment processing of circuit after AD samplings are carried out by DSP；DSP carries out SPWM calculating according to AD sampled results and outside input instruction
PWM drive signal is produced to be controlled the first converter afterwards.
First controller also includes CPLD and photoelectric isolating circuit, and CPLD connects with DSP and photoelectric isolating circuit respectively
Connect, photoelectric isolating circuit pre-processes circuit with analog signal respectively and CPLD is connected；When faulty, alarm or input voltage zero passage
During generation, the corresponding level signal of analog signal pretreatment circuit output is again by entering CPLD after photoelectric isolating circuit；CPLD
The level signal is encoded, is stored and read by DSP and processed.
Preferably, the second controller includes DSP and analog signal pretreatment circuit, and DSP is electric with to be detected three respectively
Flat pwm converter and analog signal pretreatment circuit connection, analog signal pretreatment circuit respectively with the second coulometric detector, the
Two direct current capacitors groups are connected；The detection signal of the detection signal of second coulometric detector and the second direct current capacitors group
AD samplings are carried out by DSP after analog signal pre-processes processing of circuit；DSP according to AD sampled results and outside input instruct into
Row SPWM produces PWM drive signal to be controlled three-level pwm converter to be detected after calculating.
The second controller also includes CPLD and photoelectric isolating circuit, and CPLD connects with DSP and photoelectric isolating circuit respectively
Connect, photoelectric isolating circuit pre-processes circuit with analog signal respectively and CPLD is connected；When faulty, alarm or input voltage zero passage
During generation, the corresponding level signal of analog signal pretreatment circuit output is again by entering CPLD after photoelectric isolating circuit；CPLD
The level signal is encoded, is stored and read by DSP and processed.
In order to solve the above-mentioned technical problem, detection method uses following technical scheme：Based on said detecting system
Three-level pwm converter detection method, wherein the first direct current capacitors group, the second direct current capacitors group are respectively used to storage
The fluctuation of one converter, the DC side energy of three-level pwm converter to be detected and suppression DC voltage；First controller,
Two controllers control the first converter, three-level pwm converter to be detected respectively；
Second controller is as follows to the control process of three-level pwm converter to be detected：
A1, the current signal detected according to the second coulometric detector carry out 3s/2r conversion, obtain three level to be detected
The reactive current actual value I of pwm converter outputd2With watt current actual value Iq2；
A2, the reactive current reference value I for giving three-level pwm converter to be detecteddref2And direct voltage reference value
Udcref2；
A3, the direct voltage reference value U given to three-level pwm converter to be detecteddcref2With it is actually detected arrive second
Direct current capacitors group voltage Udc2Comparing carries out PI regulations, obtains three-level pwm converter watt current reference value to be detected
Iqref2；
A4, respectively to the reactive current reference value I of three-level pwm converter to be detecteddref2With reactive current actual value
Id2, watt current reference value Iqref2With watt current actual value Iq2Comparing carries out PI regulations, obtains PWM under dq coordinate systems
Ripple reference value Udref2And Uqref2；
A5, to Udref2And Uqref2Carry out 2r/3s conversion and obtain PWM ripple reference value U under abc coordinate systemsaref2、Ubref2
And Ucref2；
A6, the pwm signal according to needed for SPWM algorithms obtain three-level pwm converter to be detected, export to be detected three
Level PWM converter；
First controller is as follows to the control process of the first converter：
B1, the current signal detected according to the first coulometric detector carry out 3s/2r conversion, obtain detecting system work electricity
The reactive current actual value I of netd1With watt current actual value Iq1；
The reactive current reference value I of B2, given first converterdref1=0 and direct voltage reference value Udcref1；
B3, the direct voltage reference value U given to the first converterdcref1With actually detected the first direct current capacitors for arriving
Group voltage Udc1Comparing carries out PI regulations, obtains the first converter watt current reference value Iqref1；
B4, respectively to the first converter reactive current reference value Idref1With reactive current actual value Id1, watt current reference
Value Iqref1With watt current actual value Iq1Comparing carries out PI regulations, obtains PWM ripple reference value U under dq coordinate systemsdref1With
Uqref1；
B5, to Udref1And Uqref1Carry out 2r/3s conversion and obtain PWM ripple reference value U under abc coordinate systemsaref1、Ubref1
And Ucref1；
B6, the pwm signal according to needed for SPWM algorithms obtain the first converter, export to the first converter.
Compared with prior art, the invention has the advantages that or beneficial effect：
The present invention is using the converter for having detected as the total idle harmonic compensator of plant area's power network, the change for having detected
Parallel operation is in running order all the time, the function with output reactive power and harmonic compensation.The present invention is to be detected by controlling
Converter, so that reactive current of the output size for load current value, realizes detection and degradation at full capacity；Meanwhile, examine
The converter of survey carries out local compensation to the load or burden without work that other loads in converter to be detected and factory are produced, and makes reactive current
In plant area, internal system is resolved, and has been finally reached the purpose saved electric energy, improve the quality of power supply, reduce product cost, solution
Power consumption technical problem high is caused as test load using blower fan, resistance or reactance in existing detection technique of having determined.
Brief description of the drawings
Fig. 1 is conventional three-level pwm converter；
Fig. 2 is embodiment of the present invention three-level pwm converter detecting 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 converter to be detected in the embodiment of the present invention；
Fig. 5 is the control flow chart that three-level pwm converter has been detected in the embodiment of the present invention；
Fig. 6 is that the active power of embodiment of the present invention detecting system, reactive power flow to schematic diagram.
Specific embodiment
Below in conjunction with embodiment and Figure of description, the present invention is described in further detail, but reality of the invention
Apply mode not limited to this.
Embodiment
The present invention needs the circuit structure of the three-level pwm converter of detection as shown in figure 1, including converter and direct current
Container group loop.
As shown in Fig. 2 in the present embodiment, three-level pwm converter detecting system includes：First direct current capacitors group,
One converter, the first reactor, first switch, the first coulometric detector, the first controller, the second direct current capacitors group, second
Reactor, the second coulometric detector, second controller and second switch.The first direct current capacitors group and the first converter
DC side is connected, and the AC of first converter is connected with the first reactor, and first reactor passes through first switch
Three-phase bus with detecting system work power network is connected；Second reactor is by second switch and detecting system work power network
Three-phase bus be connected.First, second direct current capacitors group is respectively used to the first converter of storage, the second converter DC side energy
The fluctuation of amount and suppression DC voltage.First, second reactor is used to reduce harmonic wave to improve the first converter, the second converter
The input quality of power supply.
The circuit structure of first, second coulometric detector is identical, by voltage transformer and current Hall sensor group into,
There is no interconnected relationship between the voltage transformer and the current Hall sensor, but independently work, point
Yong Yu not detectable voltage signals and current signal；First coulometric detector is arranged on detecting system work power network and external electrical
Net junction, measures the electric current and voltage of whole detecting system work power network, and its measurement signal enters the first controller；Described
Two coulometric detectors are arranged on second switch and the second reactor junction, measure operating current and the power network electricity of the second converter
Pressure, its measurement signal enters second controller.The DC side of second converter is connected with the second direct current capacitors group, described
The AC of the second converter is connected with the second reactor.
First converter is the converter for having detected, using three-level pwm converter, and as one of detecting system
Point, in running order all the time, the function with output reactive power and harmonic compensation；And the second converter is to be detected three
Level PWM converter, it has four-quadrant function.
First controller has identical internal structure with second controller, as shown in Figure 3.First controller or the second control
Device processed is main several by DSP, CPLD, photoelectric isolating circuit, analog signal pretreatment circuit, switching value process circuit and man-machine interface
Individual part composition, DSP connects with converter, CPLD, photoelectric isolating circuit, analog signal pretreatment circuit and man-machine interface respectively
Connect, photoelectric isolating circuit is connected with analog signal pretreatment circuit, CPLD and switching value process circuit respectively, and analog signal is located in advance
Reason circuit is connected with coulometric detector, direct current capacitors group respectively, and DSP exports PWM drive signal to converter.Coulometric detector
Detection signal (including current signal and voltage signal) and the detection signal of direct current capacitors group located in advance by analog signal
AD samplings are carried out by DSP after reason processing of circuit；Alarmed or input voltage zero passage detection letter when having in analog signal pretreatment circuit
Number when, analog signal pretreatment circuit produces corresponding level signal to pass through after photoelectric isolating circuit into CPLD；If there is outside
Switching signal is input into by switching value process circuit, then photoelectric isolating circuit also produces corresponding level signal to CPLD, CPLD
Foregoing these level signals are encoded, is stored and is read and processed by DSP timings.When in analog signal pretreatment circuit
When faulty signal is produced, fault-signal enters CPLD after Phototube Coupling, and interruption is produced to DSP after CPLD failure judgement classifications
Request, DSP then responds the interruption to stop PWM outputs and send power switch trip command to CPLD at once, prevents converter
Major loop is damaged；When DSP has detected alarm to be occurred, warning message is sent to man-machine interface for recording and checking by DSP；
To enter horizontal lock to line voltage when DSP detects input voltage zero cross signal, four-quadrant function will be realized for converter.People
Machine interface is mainly used to display and setup parameter, and the parameter of its display and setting is realized communicating by RS232 interfaces with DSP.DSP
The instruction being input into according to AD sampled results and from man-machine interface produces PWM drive signal to enter converter after carrying out SPWM calculating
Row control.
Second converter, i.e., three-level pwm converter to be detected, using decoupled active and reactive control, gives idle electricity
Stream desired value is the rated current of second converter, and given DC bus-bar voltage desired value is that the direct current of second converter is female
Line voltage rated value；The testing result that second controller feeds back according to the second coulometric detector, to the nothing of the second converter
Work(electric current and DC bus-bar voltage carry out closed-loop control respectively, make the reactive current of three-level pwm converter to be detected output and
DC bus-bar voltage respectively reaches desired value.As shown in figure 4, second controller is to three-level pwm converter (i.e. to be detected
Two converters) control process it is as follows：
A1, the current signal detected according to the second coulometric detector carry out 3s/2r conversion, obtain the output of the second converter
Reactive current actual value Id2With watt current actual value Iq2；
The reactive current reference value I of A2, given second converterdref2With direct voltage reference value Udcref2；
A3, the direct voltage reference value U given to the second converterdcref2With actually detected the second direct current capacitors for arriving
Group voltage Udc2Comparing carries out PI regulations, obtains the second converter watt current reference value Iqref2；
A4, respectively to the second converter reactive current reference value Idref2With reactive current actual value Id2, watt current reference
Value Iqref2With watt current actual value Iq2Comparing carries out PI regulations, obtains PWM ripple reference value U under dq coordinate systemsdref2With
Uqref2；
A5, to Udref2And Uqref2Carry out 2r/3s conversion and obtain PWM ripple reference value U under abc coordinate systemsaref2、Ubref2
And Ucref2；
A6, the pwm signal according to needed for SPWM algorithms obtain the second converter, export to the second converter.
First controller detects the electric current and voltage of whole system, real-time detection plant area power network by the first coulometric detector
Power factor, and be operational objective equal to 1 to control detecting system reactive current to be equal to 0, power factor, the described in real-time adjustment
The reactive current of one converter output.As shown in figure 5, three-level pwm converter (i.e. first change of first controller to having detected
Parallel operation) control process it is as follows：
B1, the current signal detected according to the first coulometric detector carry out 3s/2r conversion, obtain (the i.e. whole inspection of factory's net
Examining system work power network) reactive current actual value Id1With watt current actual value Iq1；
The reactive current reference value I of B2, given first converterdref1=0 and direct voltage reference value Udcref1；
B3, the direct voltage reference value U given to the first converterdcref1With actually detected the first direct current capacitors for arriving
Group voltage Udc1Comparing carries out PI regulations, obtains the first converter watt current reference value Iqref1；
B4, respectively to the first converter reactive current reference value Idref1With reactive current actual value Id1, watt current reference
Value Iqref1With watt current actual value Iq1Comparing carries out PI regulations, obtains PWM ripple reference value U under dq coordinate systemsdref1With
Uqref1；
B5, to Udref1And Uqref1Carry out 2r/3s conversion and obtain PWM ripple reference value U under abc coordinate systemsaref1、Ubref1
And Ucref1；
B6, the pwm signal according to needed for SPWM algorithms obtain the first converter, export to the first converter.
As shown in fig. 6, the active power and reactive power flow direction to whole factory net are analyzed.Assuming that inside plants except
Other loads beyond first converter and the second converter, consume active-power P2And reactive power Q2；In order to to be detected
The second converter detected at full capacity and degradation, control the idle work(that its reactive current is consumed for load current value
Rate is Q1(active power consumes very little, ignores)；First converter is equal to 0, power factor with control system reactive current
It is operational objective equal to 1, the first converter will necessarily send size for (Q1+Q2) reactive power, with offset the second converter and
Reactive power (the Q of other load consumptions1+Q2), to reach the control targe that system power factor is 1.So, factory's net it is final from
The only size of power network consumption is P2Active power, and this part of active power be all by the first converter and second become
Other loads beyond parallel operation are consumed, so that dexterously three-level pwm converter factory testing and the energy consumption of degradation
It is minimized.
It should be noted that the three-level pwm converter detecting system involved by the embodiment of the present invention, except including implementing
In example outside involved device, also including other devices known in those skilled in the art, in order to protrude hair of the invention
Bright thought, therefore, only the device for being related to invention thought of the invention is described in an embodiment of the present invention, to inverter
In known other devices be not added with repeating.
Above-described embodiment is the present invention preferably implementation method, but embodiments of the present invention are not by above-described embodiment
Limitation, other it is any without departing from the modification made under Spirit Essence of the invention and principle, modification, replacement, combination, simplification,
Equivalent substitute mode is should be, should be all included within protection scope of the present invention.
Claims (9)
1. three-level pwm converter detecting system, it is characterised in that the detecting system includes：First coulometric detector, first
Converter, the first controller, second controller and the second coulometric detector, wherein the first converter is detecting system work power network
Idle and harmonic compensator；First coulometric detector is used to measure the electric current and voltage of detecting system work power network, and
Measurement result is transferred to the first controller；Second coulometric detector is used to measure three-level pwm converter to be detected
Operating current and line voltage, and measurement result is transferred to second controller；
First controller is according to the measurement result of the first coulometric detector, the idle electricity of the converter of real-time adjustment first output
Stream, so that controlling detecting system reactive current to be equal to 0, power factor is equal to 1；
The second controller according to the measurement result of the second coulometric detector, to the idle of three-level pwm converter to be detected
Electric current and DC bus-bar voltage carry out closed-loop control respectively, make the reactive current of three-level pwm converter to be detected output and straight
Stream busbar voltage respectively reaches default rated value.
2. detecting system according to claim 1, it is characterised in that the detecting system also includes：First DC capacitor
Device group and the second direct current capacitors group；The first direct current capacitors group is connected with the DC side of the first converter；Described second
Direct current capacitors group is connected with the DC side of three-level pwm converter to be detected.
3. detecting system according to claim 1, it is characterised in that the detecting system also includes：First reactor and
Second reactor；One end of first reactor is connected with the input of first converter, other end and detecting system work
The three-phase bus for making power network is connected；One end of second reactor is connected with the input of the three-level pwm converter to be detected,
Other end is connected with the three-phase bus of detecting system work power network.
4. detecting system according to claim 1, it is characterised in that first converter is three-level pwm converter.
5. detecting system according to claim 2, it is characterised in that first controller includes DSP and analog signal
Pretreatment circuit, DSP and the first converter and analog signal pretreatment circuit are connected, and analog signal pre-processes circuit respectively with the
One coulometric detector, the connection of the first direct current capacitors group；
The detection signal of the detection signal of first coulometric detector and the first direct current capacitors group is pre- by analog signal
AD samplings are carried out by DSP after processing circuit processes；DSP is produced after carrying out SPWM calculating according to AD sampled results and outside input instruction
Raw PWM drive signal is controlled to the first converter.
6. detecting system according to claim 5, it is characterised in that first controller also include CPLD and photoelectricity every
From circuit, CPLD is connected with DSP and photoelectric isolating circuit respectively, photoelectric isolating circuit respectively with analog signal pre-process circuit and
CPLD is connected；
When faulty, alarm or input voltage zero passage occur, the corresponding level signal of analog signal pretreatment circuit output is again
By entering CPLD after photoelectric isolating circuit；CPLD encoded to the level signal, stored and read by DSP and carried out
Reason.
7. detecting system according to claim 2, it is characterised in that the second controller includes DSP and analog signal
Pretreatment circuit, DSP is connected with three-level pwm converter to be detected and analog signal pretreatment circuit respectively, and analog signal is pre-
Process circuit is connected with the second coulometric detector, the second direct current capacitors group respectively；
The detection signal of the detection signal of second coulometric detector and the second direct current capacitors group is pre- by analog signal
AD samplings are carried out by DSP after processing circuit processes；DSP is produced after carrying out SPWM calculating according to AD sampled results and outside input instruction
Raw PWM drive signal is controlled to three-level pwm converter to be detected.
8. detecting system according to claim 7, it is characterised in that the second controller also include CPLD and photoelectricity every
From circuit, CPLD is connected with DSP and photoelectric isolating circuit respectively, photoelectric isolating circuit respectively with analog signal pre-process circuit and
CPLD is connected；
When faulty, alarm or input voltage zero passage occur, the corresponding level signal of analog signal pretreatment circuit output is again
By entering CPLD after photoelectric isolating circuit；CPLD encoded to the level signal, stored and read by DSP and carried out
Reason.
9. the three-level pwm converter detection method of detecting system described in claim 2 is based on, it is characterised in that the first direct current
Capacitor bank, the second direct current capacitors group are respectively used to the first converter of storage, the DC side of three-level pwm converter to be detected
The fluctuation of energy and suppression DC voltage；First controller, second controller control the first converter, three level to be detected respectively
Pwm converter；
Second controller is as follows to the control process of three-level pwm converter to be detected：
A1, the current signal detected according to the second coulometric detector carry out 3s/2r conversion, obtain three-level pwm to be detected and become
The reactive current actual value I of parallel operation outputd2With watt current actual value Iq2；
A2, the reactive current reference value I for giving three-level pwm converter to be detecteddref2With direct voltage reference value Udcref2；
A3, the direct voltage reference value U given to three-level pwm converter to be detecteddcref2With actually detected the second direct current for arriving
Capacitor bank voltage Udc2Comparing carries out PI regulations, obtains three-level pwm converter watt current reference value I to be detectedqref2；
A4, respectively to the reactive current reference value I of three-level pwm converter to be detecteddref2With reactive current actual value Id2, it is active
Current reference value Iqref2With watt current actual value Iq2Comparing carries out PI regulations, obtains dqPWM ripple reference value under coordinate system
Udref2And Uqref2；
A5, to Udref2And Uqref2Carry out 2r/3s conversion and obtain PWM ripple reference value U under abc coordinate systemsaref2、Ubref2With
Ucref2；
A6, the pwm signal according to needed for SPWM algorithms obtain three-level pwm converter to be detected, export to three level to be detected
Pwm converter；
First controller is as follows to the control process of the first converter：
B1, the current signal detected according to the first coulometric detector carry out 3s/2r conversion, obtain detecting system work power network
Reactive current actual value Id1With watt current actual value Iq1；
The reactive current reference value I of B2, given first converterdref1=0 and direct voltage reference value Udcref1；
B3, the direct voltage reference value U given to the first converterdcref1With actually detected the first direct current capacitors group electricity for arriving
Pressure Udc1Comparing carries out PI regulations, obtains the first converter watt current reference value Iqref1；
B4, respectively to the first converter reactive current reference value Idref1With reactive current actual value Id1, watt current reference value
Iqref1With watt current actual value Iq1Comparing carries out PI regulations, obtains dqPWM ripple reference value U under coordinate systemdref1With
Uqref1；
B5, to Udref1And Uqref1Carry out 2r/3s conversion and obtain PWM ripple reference value U under abc coordinate systemsaref1、Ubref1With
Ucref1；
B6, the pwm signal according to needed for SPWM algorithms obtain the first converter, export to the first converter.
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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 |
| US10651651B2 (en) * | 2016-12-09 | 2020-05-12 | Daikin Industries, Ltd. | Device with built-in active filter |
| CN107024614B (en) * | 2017-03-09 | 2020-02-21 | 创锐装备智造(西安)股份有限公司 | Method for testing voltage converter for charging pile |
| CN107064699B (en) * | 2017-06-09 | 2023-07-25 | 刘孝涛 | Aging test device of vehicle-mounted DC/DC converter |
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