CN103091587B - Energy-saving inverter test circuit and control method - Google Patents
Energy-saving inverter test circuit and control method Download PDFInfo
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- CN103091587B CN103091587B CN201310026247.6A CN201310026247A CN103091587B CN 103091587 B CN103091587 B CN 103091587B CN 201310026247 A CN201310026247 A CN 201310026247A CN 103091587 B CN103091587 B CN 103091587B
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Abstract
The invention discloses an energy-saving inverter test circuit which is characterized by comprising a reference voltage generating unit, an electric reactor, 2N tested inverter units and a controller unit. Power of inverters in the same group of tested inverter units is equal. The inverter circuit can be composed of part insulated gate bipolar translators (IGBT) which is capable of being closed. The controller unit controls two tested inverter units in the same group, one tested inverter unit works in a sending inductive reactive state, and the other one tested inverter unit works in a sending equivalent capacitive reactive state. The N is a positive integer. The control method comprises the steps of a) connecting the tested inverters, b) detecting signal connection, c) charging a bus, and d) outputting voltage with the same frequency and the same phase, and achieving reactive power hedging. According to the energy-saving inverter test circuit, a connecting manner is rapid and convenient to achieve, a total power test of a high-power inverter unit can be achieved in a condition that a preceding stage input capacity is small, electric energy and test cost are effectively saved, and the test manner is efficient and energy-saving.
Description
Technical field
The present invention relates to a kind of energy-conservation inverter test circuit and control method, in particular, the two tested inverter units particularly related in a kind of same group carry out energy-conservation inverter test circuit that reactive power liquidates and control method.
Background technology
Along with the growing of Power Electronic Technique and maturation, the inverter product of various electric pressure is more and more applied in various occasion and field, in order to ensure that product is reliable in issue and user's use procedure, detailed performance, Function and environment test must be done to inverter product by manufacturer, and full load test is wherein most important one, and what mainly can examine is temperature rise test, loss test, efficiency, voltage stress, the index such as current stress and overcurrent capability.
Current full load test adopts the most general a kind of test mode to be exactly by inverter driving electric machine, motor run generator loads, the electric energy that generator sends or consumed by resistance heating, fed back on electrical network by inversion and recycle, first kind of way is a kind of completely not energy-conservation mode, in second, mode is relatively energy-conservation mode, but first has the problem of an efficiency when feeding back to electrical network, and the harmonic wave that secondly feedback device produces also is injected on electrical network simultaneously.
In addition above-mentioned two kinds of modes have a common feature be exactly when design experiment system will each link in guarantee system will with the power match of tested inverter unit, namely the power of unitunder test can not be less than, this is just to the load capacity of system, power supply capacity design is had higher requirement, and will have enough planning and capital budgeting early stage in design.
Summary of the invention
The present invention is in order to overcome the shortcoming of above-mentioned technical matters, and the two tested inverter units provided in a kind of same group carry out energy-conservation inverter test circuit that reactive power liquidates and control method.
Energy-conservation inverter test circuit of the present invention, its special feature is: comprise reference voltage generating unit, reactor, a 2N tested inverter unit and controller unit, the output of tested inverter unit is connected through the output of reactor with reference voltage generating unit; Reference voltage generating unit comprises rectification circuit and inverter circuit, and the input end of rectification circuit is connected with extraneous three-phase supply, and inverter circuit exports three-phase reference voltage; Two tested inverter units are one group, and in same group of tested inverter unit, the power of inverter is equal; Inverter circuit in reference voltage generating unit and tested inverter unit is formed by turn-off device IGBT; Controller unit can detect the busbar voltage of tested inverter unit and the electric current of output thereof, and the drive singal that controller unit exports is connected with the control end of the IGBT in tested inverter unit with the IGBT in reference voltage generating unit; Controller unit controls two tested inverter units in same group, and one is operated in and sends perceptual idle state, and another is operated in and sends equivalent capacitive reactive power state; N is positive integer.
Controller unit has the effect that signals collecting, data operation and control export, and can gather busbar voltage and the output current of tested inverter unit, and the exportable drive singal that IGBT is controlled.Under the control of controller unit, by the exportable frequency of reference voltage generating unit and all adjustable reference voltage signal of phase place.The tested inverter unit that controller unit controls in same group is operated in perceptual idle state, another tested inverter unit is operated in capacitive reactive power state, energy in such experimental circuit can transform between two tested inverter units in the same set mutually, except the switch consumed energy of the discharge and recharge of reactor and bus capacitor, IGBT, basic noenergy consumption, fully loaded, the burn-in test of tested inverter unit can be completed, significantly reduce the consumption of energy to external world.
Energy-conservation inverter test circuit of the present invention, described tested inverter unit is single-phase H bridge inverter unit, three-phase two-level inverter unit or three-phase tri-level inverter unit.
Energy-conservation inverter test circuit of the present invention, when tested inverter unit is single-phase H bridge inverter unit, an output of single-phase H bridge is connected on an output terminal of reference voltage generating unit through reactor, all single-phase H bridges another export link together after, be connected on another output terminal of reference voltage generating unit.
Energy-conservation inverter test circuit of the present invention, when tested inverter unit be three-phase two-level inverter unit or three-phase tri-level inverter unit, the three-phase of tested inverter unit exports the three-phase being connected to reference voltage generating unit after reactor and exports.
Energy-conservation inverter test circuit of the present invention, described reference voltage generating unit comprises signal processor and coupled drive singal processor, data communication module, analog to digital conversion circuit and current foldback circuit; Drive singal processor is for exporting the drive singal of each IGBT and detecting the operation information of each tested inverter unit; data communication module realizes the communication with upper PC; analog to digital conversion circuit is for transforming the output current of each tested inverter unit, and current foldback circuit is for generation of overcurrent protection signal.The operation information of tested inverter unit comprise the busbar voltage of tested inverter unit and duty whether normal.
Energy-conservation inverter test circuit of the present invention, in described reference voltage generating unit, the input end of rectification circuit is provided with time delay buffer circuit, and output terminal is provided with DC filter capacitor.Resistance can be dropped in charging start time by time delay buffer circuit and carry out current limliting, avoid damaging rectifying device.
The control method of energy-conservation inverter test circuit of the present invention, comprises the following steps: a). and tested inverter connects, and is one group, is connected to the output terminal of reference voltage generating unit with reactor after being connected with the tested inverter unit that power is equal; B). detection signal connects, and is connected the busbar voltage test side of tested inverter unit, to realize the measurement to busbar voltage with controller unit; Hall current sensor is set at the output terminal of tested inverter unit, to realize the detection to tested inverter unit output current; C). to busbar charging, controller unit controls reference voltage generating unit, tested inverter unit carries out work, charges to the bus of tested inverter unit, until busbar voltage is stablized; D). export with frequency in-phase voltage, under the control of controller unit, two inverters controlled in same group of tested inverter unit export the voltage of same homophase frequently; And control the electric current that one of them tested inverter unit exports leading voltage pi/2, control the electric current of another tested inverter unit lag output voltage pi/2, liquidate to realize reactive power, reduce the consumption of outside energy; E). busbar voltage detects, controller unit detects the busbar voltage of tested inverter unit all the time, when busbar voltage is too low, bus pressed carries out boosting rectifier control by controlling reference voltage generating unit and tested inverter unit, maintain busbar voltage constant; F). current detecting, controller unit detects the current value of tested inverter unit output by Hall current sensor, if current value has exceeded ratings, then by reducing the voltage difference between reference voltage generating unit and tested inverter unit output terminal, reduce the output current of tested inverter unit; If current value reaches overcurrent protection value, then turn off the operation of the tested inverter unit of this group.
The invention has the beneficial effects as follows: energy-conservation inverter test circuit of the present invention, by all adjustable reference voltage generating unit of frequency and amplitude arranging output voltage, using equal for power two tested inverter units as one group, received on the output terminal of reference voltage generating unit by reactor; By controller unit the tested inverter unit of two in same group is operated in respectively and sends capacitive reactive power and the idle state of perception, in the process of inverter being carried out to fully loaded and aging test, significantly reduce the consumption of energy to external world, avoid in the past adopt motor to holder high energy consumption and by back electrical energy to high cost during electrical network, energy-saving effect is remarkable.Circuit of the present invention is simple, and the mode of connection is quick, and can realize the full power trial (FPT) of high power contravariant unit in the occasion that prime input capacity is very little, effectively save electric energy and testing expenses, be a kind of energy-efficient test method.
The beneficial effect major embodiment of energy-conservation inverter test circuit of the present invention is in the following areas:
(1) hookup of the present invention, except DC losses and the iron loss of reactor in system, the outer link that substantially do not consume energy of switching loss of IGBT, be do not need from system, get energy in theory, overall efficiency can reach more than 99%.
(2) wiring is simple, single-phase can be general with the test macro of three-phase inverter, than motor load in the past, have more versatility with compatible.
(3) control system is simple, utilize a core controller, the voltage-phase of tested inverter unit need not be detected, voltage synchronous can be saved and detect, additionally by Hall element, the output current of each tested unit is done closed-loop control, improve control accuracy and the performance of control system.
(4) control system gathers the busbar voltage of each tested unit, does closed-loop control to the busbar voltage of tested unit, makes the busbar voltage of each tested unit balanced.
(5) controlled amplitude and the frequency of output voltage by reference voltage generating unit, can regulator be saved.
(6) reference voltage generating unit control output frequency can simulation system frequency jitter.
(7) any phase voltage that reference voltage generating unit controls to export can simulation system Voltage unbalance and voltage fluctuation.
(8) test efficiency is high, and can test 2N(N is integer simultaneously) inverter unit that individual power is suitable, the power of the reference voltage generating unit of prime can be accomplished very little.Along with the increase of element number, the power of reference voltage generating unit can be constant.
Accompanying drawing explanation
Fig. 1 is the theory diagram of middle controller unit of the present invention;
Fig. 2 is the circuit theory diagrams of the reference voltage generating unit of two level in the present invention;
Fig. 3 is the circuit theory diagrams of the reference voltage generating unit of three level in the present invention;
Fig. 4 is the hookup system diagram of single-phase tested inverter unit of the present invention;
Fig. 5 is the hookup system diagram of the tested inverter unit of three-phase two level of the present invention;
Fig. 6 is the hookup system diagram of the tested inverter unit of three-phase tri-level of the present invention.
In figure: 1 reference voltage generating unit, 2 reactors, 3 tested inverter units, 4 signal processors, 5 drive singal processors, 6 data communication modules, 7 analog to digital conversion circuits.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
Energy-conservation inverter test circuit of the present invention is made up of reference voltage generating unit 1, reactor 2, tested inverter unit 3 and controller unit, the effect that controller unit has signals collecting, data operation and control export, reference voltage generating unit 1 is for generation of frequency and all adjustable voltage signal of amplitude.Give the circuit theory diagrams of controller unit as shown in Figure 1, it comprises signal processor 4, drive singal processor 5, data communication module 6, analog to digital conversion circuit 7 and current foldback circuit; Signal processor is made up of dsp chip, realizes main collection and control action.Drive singal processor 5 is connected with signal processor 4, can be formed by FPGA, for the drive singal of IGBT in IGBT in output reference voltage generating unit 1 and tested inverter unit 3, with the on off operating mode of control IGBT; Drive singal processor 5 also can detect the operation information of tested inverter unit 3, comprises busbar voltage and the running status of tested inverter unit.
Data communication module 6 is connected with signal processor 4, is display and man-machine interface part, realizes being connected with the communication of host computer, information to be uploaded to host computer and the control accepting host computer.Analog to digital conversion circuit 7 is converted into digital signal for the simulating signal of the output current by the tested inverter unit 3 gathered, and inputs in signal processor 4.When current foldback circuit detects that the electric current that tested inverter unit 3 exports is too high, trigger pip can be produced to signal processor 4.
As shown in Figures 2 and 3, sets forth the circuit theory diagrams of the reference voltage generating unit of two level and three level in the present invention, it comprises time delay buffer circuit, rectification circuit, DC filtering circuit and inverter circuit, shown rectification circuit is made up of commutation diode, its input end is connected with extraneous three-phase alternating-current supply by time delay buffer circuit, and the resistance in time delay buffer circuit realizes the metering function to rectifying device.Inverter circuit all adopts and can turn off IGBT power device, with output amplitude and all adjustable voltage signal of phase place.The difference of two level and three level reference voltage generating unit is, the bus bar side of the inverter circuit in Fig. 2 is two level, and the bus bar side of the inverter circuit in Fig. 3 is three-level structure.
As shown in Figure 4, give the hookup system diagram of single-phase tested inverter unit of the present invention, shown tested inverter unit 3 is single-phase H bridge construction, single-phase H bridge is also made up of turn-off device IGBT, an output terminal of single-phase H bridge is connected on an output terminal of reference voltage generating unit 1 after reactor 2, first another output terminal of all single-phase H bridges links together, and then receives on another output terminal of reference voltage generating unit 1.The remaining brachium pontis of reference voltage generating unit 1 does not work.The quantity of shown tested inverter unit 3 is 2N, and two is one group, and in same group, the power of two tested inverter units is equal; Controller unit controls two tested inverter units 3 in same group, one of them tested inverter unit 3 sends inductance current, the tested inverter unit of another one 3 sends the equal capacity current of amplitude, namely one is operated in and sends perceptual idle state, and another is operated in and sends equivalent capacitive reactive power state; Like this, except DC losses and the iron loss of reactor in system 2, the outer link that substantially do not consume energy of switching loss of IGBT, be do not need from system, get energy in theory, overall efficiency can reach more than 99%.Fig. 5 and Fig. 6 sets forth the hookup system diagram of the tested inverter unit of three-phase two level and three-phase tri-level, three output terminals of tested inverter unit 3 are received on three output terminals of reference voltage generating unit 1 respectively through after three coils of reactor 2, similarly, 2N tested inverter unit 3 two is one group, and in same group, the power of two tested inverter units is equal; Controller unit two the tested inverter units 3, controlled in same group are operated in and send perceptual idle state, and another is operated in and sends equivalent capacitive reactive power state.
The control method of energy-conservation inverter test circuit of the present invention, comprises the following steps:
A). tested inverter connects, and is one group, is connected to the output terminal of reference voltage generating unit (1) with reactor (2) after being connected with the tested inverter unit (3) that power is equal;
B). detection signal connects, and is connected the busbar voltage test side of tested inverter unit, to realize the measurement to busbar voltage with controller unit; Hall current sensor is set at the output terminal of tested inverter unit, to realize the detection to tested inverter unit output current;
C). to busbar charging, controller unit controls reference voltage generating unit, tested inverter unit carries out work, charges to the bus of tested inverter unit, until busbar voltage is stablized;
D). export with frequency in-phase voltage, under the control of controller unit, two inverters controlled in same group of tested inverter unit export the voltage of same homophase frequently; And control the electric current that one of them tested inverter unit exports leading voltage pi/2, control the electric current of another tested inverter unit lag output voltage pi/2, liquidate to realize reactive power, reduce the consumption of outside energy;
E). busbar voltage detects, controller unit detects the busbar voltage of tested inverter unit all the time, when busbar voltage is too low, bus pressed carries out boosting rectifier control by controlling reference voltage generating unit and tested inverter unit, maintain busbar voltage constant;
F). current detecting, controller unit detects the current value of tested inverter unit output by Hall current sensor, if current value has exceeded ratings, then by reducing the voltage difference between reference voltage generating unit and tested inverter unit output terminal, reduce the output current of tested inverter unit; If current value reaches overcurrent protection value, then turn off the operation of the tested inverter unit of this group.
Circuit of the present invention is simple, and the mode of connection is quick, and can realize the full power trial (FPT) of high power contravariant unit in the occasion that prime input capacity is very little, effectively save electric energy and testing expenses, be a kind of energy-efficient test method.Energy-conservation inverter test circuit of the present invention and control method, voltage reference is provided by reference voltage generating unit, the paired unit be connected in parallel in reference voltage output realizes reactive power and liquidates, ensure that the output of reference voltage generating unit maintains zero energy substantially, only need obtain little energy from grid side, effectively achieve energy-conservation.
Claims (7)
1. an energy-conservation inverter test circuit, it is characterized in that: comprise reference voltage generating unit (1), reactor (2), a 2N tested inverter unit (3) and controller unit, the output of tested inverter unit is connected through the output of reactor with reference voltage generating unit; Reference voltage generating unit comprises rectification circuit and inverter circuit, and the input end of rectification circuit is connected with extraneous three-phase supply, and inverter circuit exports three-phase reference voltage; Two tested inverter units are one group, and in same group of tested inverter unit, the power of inverter is equal; Inverter circuit in reference voltage generating unit and tested inverter unit is formed by turn-off device IGBT; Controller unit can detect the busbar voltage of tested inverter unit and the electric current of output thereof, and the drive singal that controller unit exports is connected with the control end of the IGBT in tested inverter unit with the IGBT in reference voltage generating unit; Controller unit controls two tested inverter units in same group, and one is operated in and sends perceptual idle state, and another is operated in and sends equivalent capacitive reactive power state; N is positive integer.
2. energy-conservation inverter test circuit according to claim 1, is characterized in that: described tested inverter unit (3) is single-phase H bridge inverter unit, three-phase two-level inverter unit or three-phase tri-level inverter unit.
3. energy-conservation inverter test circuit according to claim 2, it is characterized in that: when tested inverter unit (3) is for single-phase H bridge inverter unit, all single-phase H bridges are connected on an output terminal of reference voltage generating unit (1) through a different reactor (2) separately, all single-phase H bridges another export link together after, be connected on another output terminal of reference voltage generating unit.
4. energy-conservation inverter test circuit according to claim 2, it is characterized in that: when tested inverter unit (3) is for three-phase two-level inverter unit or three-phase tri-level inverter unit, the three-phase of tested inverter unit exports the three-phase being connected to reference voltage generating unit after reactor (2) and exports.
5. energy-conservation inverter test circuit according to claim 1 and 2, is characterized in that: described reference voltage generating unit (1) comprises signal processor (4) and coupled drive singal processor (5), data communication module (6), analog to digital conversion circuit (7) and current foldback circuit; Drive singal processor is for exporting the drive singal of each IGBT and detecting the operation information of each tested inverter unit (3); data communication module realizes the communication with upper PC; analog to digital conversion circuit is for transforming the output current of each tested inverter unit, and current foldback circuit is for generation of overcurrent protection signal.
6. energy-conservation inverter test circuit according to claim 1 and 2, is characterized in that: in described reference voltage generating unit (1), the input end of rectification circuit is provided with time delay buffer circuit, and output terminal is provided with DC filter capacitor.
7. based on a control method for inverter test circuit energy-conservation described in claim 1, it is characterized in that, comprise the following steps:
A). tested inverter connects, and is one group, is connected to the output terminal of reference voltage generating unit (1) with reactor (2) after being connected with the tested inverter unit (3) that power is equal;
B). detection signal connects, and is connected the busbar voltage test side of tested inverter unit, to realize the measurement to busbar voltage with controller unit; Hall current sensor is set at the output terminal of tested inverter unit, to realize the detection to tested inverter unit output current;
C). to busbar charging, controller unit controls reference voltage generating unit, tested inverter unit carries out work, charges to the bus of tested inverter unit, until busbar voltage is stablized;
D). export with frequency in-phase voltage, under the control of controller unit, two inverters controlled in same group of tested inverter unit export the voltage of same homophase frequently; And control the electric current that one of them tested inverter unit exports leading voltage pi/2, control the electric current of another tested inverter unit lag output voltage pi/2, liquidate to realize reactive power, reduce the consumption of outside energy;
E). busbar voltage detects, controller unit detects the busbar voltage of tested inverter unit all the time, when busbar voltage is too low, by control reference voltage generating unit and tested inverter unit, boosting rectifier control is carried out to busbar voltage, maintain busbar voltage constant;
F). current detecting, controller unit detects the current value of tested inverter unit output by Hall current sensor, if current value has exceeded ratings, then by reducing the voltage difference between reference voltage generating unit and tested inverter unit output terminal, reduce the output current of tested inverter unit; If current value reaches overcurrent protection value, then turn off the operation of the tested inverter unit of this group.
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| CN104297700A (en) * | 2014-09-17 | 2015-01-21 | 思源清能电气电子有限公司 | Testing platform for three-level H bridge converter |
| CN107505933A (en) * | 2017-09-05 | 2017-12-22 | 上海地铁电子科技有限公司 | Subordinate inverter controller test system |
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| CN108226811A (en) * | 2017-12-30 | 2018-06-29 | 长园深瑞继保自动化有限公司 | Converter power module liquidates test system |
| CN109283410B (en) * | 2018-09-11 | 2024-01-23 | 长鑫存储技术有限公司 | Capacitance test device and forming method thereof |
| CN110286316B (en) * | 2019-07-02 | 2022-02-01 | 中车大连机车研究所有限公司 | Pure inductance drag-based power module full-power test method and system |
| CN110609182B (en) * | 2019-08-09 | 2022-02-15 | 国电南瑞科技股份有限公司 | Half-bridge and full-bridge universal self-energy-taking type power unit hedging device and testing method thereof |
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