CN103091587A - Energy-saving inverter test circuit and control method - Google Patents
Energy-saving inverter test circuit and control method Download PDFInfo
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- CN103091587A CN103091587A CN2013100262476A CN201310026247A CN103091587A CN 103091587 A CN103091587 A CN 103091587A CN 2013100262476 A CN2013100262476 A CN 2013100262476A CN 201310026247 A CN201310026247 A CN 201310026247A CN 103091587 A CN103091587 A CN 103091587A
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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 Experimental circuit and control method, in particular, the two tested inverter units that relate in particular in a kind of same group carry out energy-conservation Inverter Experimental circuit and the control method that reactive power liquidates.
Background technology
Along with the growing of Power Electronic Technique and maturation, the inverter product of various electric pressures more and more is applied in various occasions and field, in order to guarantee that product is reliable in issue and user's use procedure, detailed performance, Function and environment test must be done to the inverter product by manufacturer, and full load test is wherein most important a kind of, and what mainly can examine is temperature rise test, loss test, efficient, voltage stress, the indexs such as current stress and overcurrent capability.
The most general a kind of test mode of full load test employing at present is exactly by inverter driving electric machine, the motor run generator loads, the electric energy that generator sends or consume by resistance heating, feed back on electrical network by inversion and recycle, first kind of way is a kind of fully not energy-conservation mode, in second, mode is relatively energy-conservation mode, but at first has the problem of an efficient when feeding back to electrical network, and secondly the harmonic wave of feedback device generation also is injected on electrical network simultaneously.
In addition above-mentioned dual mode have common characteristics be exactly will assurance when the design experiment system in system each link will with the power match of tested inverter unit, namely can not be less than the power of unitunder test, this is just to the load capacity of system, the power supply capacity design is had higher requirement, and early stage enough planning and capital budgeting will be arranged in design.
Summary of the invention
The present invention provides two tested inverter units in a kind of same group to carry out energy-conservation Inverter Experimental circuit and the control method that reactive power liquidates in order to overcome the shortcoming of above-mentioned technical matters.
Energy-conservation Inverter Experimental 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 the reference voltage generating unit; The reference voltage generating unit comprises rectification circuit and inverter circuit, and the input end of rectification circuit is connected with extraneous three-phase supply, inverter circuit output three-phase reference voltage; Two tested inverter units are one group, and in same group of tested inverter unit, the power of inverter equates; Inverter circuit in reference voltage generating unit and tested inverter unit consists of 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 control end of the IGBT in the IGBT in the driving signal of controller unit output and reference voltage generating unit and tested inverter unit is connected; Two tested inverter units during controller unit is controlled same group, one is operated in the perceptual idle state that sends, and another is operated in the equivalent capacitive reactive power state that sends; N is positive integer.
Controller unit has the effect of signals collecting, data operation and control output, can gather busbar voltage and the output current of tested inverter unit, and the exportable driving signal that IGBT is controlled.Under the control of controller unit, by the equal adjustable reference voltage signal of the exportable frequency of reference voltage generating unit and phase place.A tested inverter unit during controller unit is controlled same group is operated in perceptual idle state, another tested inverter unit is operated in the capacitive reactive power state, energy in experimental circuit can transform between two tested inverter units in same group mutually like this, except the switch consumed energy of the discharging and recharging of reactor and bus capacitor, IGBT, basic noenergy consumption, can complete fully loaded, the burn-in test of tested inverter unit, effectively reduce the consumption of energy to external world.
Energy-conservation Inverter Experimental circuit of the present invention, described tested inverter unit are single-phase H bridge inverter unit, three-phase two-level inverter unit or three-phase tri-level inverter unit.
Energy-conservation Inverter Experimental circuit of the present invention, in the situation that 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, after another output of all single-phase H bridges links together, be connected on another output terminal of reference voltage generating unit.
Energy-conservation Inverter Experimental circuit of the present invention, in the situation that tested inverter unit is three-phase two-level inverter unit or three-phase tri-level inverter unit, in the three-phase output of the three-phase of tested inverter unit output through being connected to the reference voltage generating unit after reactor.
Energy-conservation Inverter Experimental circuit of the present invention, described reference voltage generating unit comprise signal processor and coupled driving signal processor, data communication module, analog to digital conversion circuit and current foldback circuit; Drive signal processor and be used for the driving signal of each IGBT of output and the operation information that detects each tested inverter unit; the data communication module realizes the communication with upper PC; analog to digital conversion circuit is used for transforming the output current of each tested inverter unit, and current foldback circuit is for generation of the 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 Experimental circuit of the present invention, in described reference voltage generating unit, the input end of rectification circuit is provided with the time-delay buffer circuit, and output terminal is provided with dc filter capacitor.Can drop into resistance and carry out current limliting the zero hour in charging by the time-delay buffer circuit, avoid damaging rectifying device.
The control method of energy-conservation Inverter Experimental circuit of the present invention comprises the following steps: a). and tested inverter connects, and the tested inverter unit that equates take power is as one group, with the output terminal that is connected to the reference voltage generating unit after reactor is connected; B). detection signal connects, and the busbar voltage test side of tested inverter unit is connected with controller unit, with the measurement of realization to busbar voltage; Output terminal at tested inverter unit arranges Hall current sensor, to realize the detection to tested inverter unit output current; C). to busbar charging, controller unit is controlled the reference voltage generating unit, tested inverter unit carries out work, the bus of tested inverter unit is charged, until busbar voltage is stable; D). output under the control of controller unit, is controlled the two same voltages of homophase frequently of inverters output in same group of tested inverter unit with the frequency in-phase voltage; And control the electric current that one of them tested inverter unit is exported the leading voltage pi/2, and 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, and 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, bus is pressed and carries out boosting rectifier control, keeps 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 surpassed ratings, 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 has reached the overcurrent protection value, turn-off the operation of the tested inverter unit of this group.
The invention has the beneficial effects as follows: energy-conservation Inverter Experimental circuit of the present invention, frequency by output voltage is set and amplitude be adjustable reference voltage generating unit all, the two tested inverter units that power is equal are received by reactor on the output terminal of reference voltage generating unit as one group; By controller unit, two tested inverter units in same group are operated in respectively capacitive reactive power and the perceptual idle state of sending, inverter is fully loaded with and the process of aging test in, effectively reduced the consumption of energy to external world, expensive when having avoided adopting motor to the high energy consumption of holder in the past and electric energy being fed back to electrical network, energy-saving effect is remarkable.Circuit of the present invention is simple, and the mode of connection is quick, can realize the full power trial (FPT) of high power contravariant unit in the very little occasion of prime input capacity, has effectively saved electric energy and testing expenses, is a kind of energy-efficient test method.
The beneficial effect major embodiment of energy-conservation Inverter Experimental circuit of the present invention is in the following areas:
(1) hookup of the present invention, except direct current loss and the iron loss of reactor in system, the switching loss of the IGBT link that substantially do not consume energy outward, be in theory do not need to get from system can, overall efficiency can reach more than 99%.
(2) wiring is simple, and single-phase and test macro three-phase inverter can be general, has more versatility with compatible than motor load in the past.
(3) control system is simple, utilize a core controller, need not detect the voltage-phase of tested inverter unit, can save voltage and synchronously detect, by Hall element, the output current of each tested unit is done closed-loop control in addition, improved control accuracy and the performance of control system.
(4) control system gathers the busbar voltage of each tested unit, and the busbar voltage of tested unit is done closed-loop control, makes the busbar voltage of each tested unit balanced.
(5) controlled amplitude and the frequency of output voltage by the reference voltage generating unit, can save regulator.
(6) reference voltage generating unit control output frequency can the simulation system frequency jitter.
(7) any phase voltage of reference voltage generating unit control output can simulation system Voltage unbalance and voltage fluctuation.
(8) test efficiency is high, and can test simultaneously 2N(N is integer) 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.
Description of drawings
Fig. 1 is the theory diagram of middle controller of the present invention unit;
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 signal processor, 6 data communication modules, 7 analog to digital conversion circuits.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
Energy-conservation Inverter Experimental circuit of the present invention is comprised of reference voltage generating unit 1, reactor 2, tested inverter unit 3 and controller unit, controller unit has the effect of signals collecting, data operation and control output, and reference voltage generating unit 1 is for generation of the equal adjustable voltage signal of frequency and amplitude.Provided as shown in Figure 1 the circuit theory diagrams of controller unit, it comprises signal processor 4, drives signal processor 5, data communication module 6, analog to digital conversion circuit 7 and current foldback circuit; Signal processor is made of dsp chip, realizes main collection and control action.Drive signal processor 5 and be connected with signal processor 4, can be formed by FPGA, be used for the driving signal of IGBT in output reference voltage generating unit 1 IGBT and tested inverter unit 3, to control the on off operating mode of IGBT; Drive signal processor 5 and also can detect the operation information of tested inverter unit 3, comprise busbar voltage and the running status of tested inverter unit.
As shown in Figures 2 and 3, the circuit theory diagrams of the reference voltage generating unit of two level and three level in the present invention have been provided respectively, it comprises time-delay buffer circuit, rectification circuit, DC filtering circuit and inverter circuit, shown rectification circuit is made of commutation diode, its input end is connected with extraneous three-phase alternating-current supply by the time-delay buffer circuit, and the resistance in the time-delay buffer circuit is realized the metering function to rectifying device.Inverter circuit all adopts and can turn-off the IGBT power device, with the equal adjustable voltage signal of output amplitude and phase place.The difference of two level and three level reference voltage generating units 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 structures.
As shown in Figure 4, provided 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 also is made of turn-off device IGBT, on the output terminal of an output terminal of single-phase H bridge through being connected to reference voltage generating unit 1 after reactor 2, at 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 is not worked.The quantity of shown tested inverter unit 3 is 2N, and two is one group, and the power of two tested inverter units equates in same group; Two tested inverter units 3 during controller unit is controlled same group, one of them tested inverter unit 3 sends inductance current, the tested inverter unit 3 of another one sends the capacity current that amplitude equates, namely one is operated in the perceptual idle state that sends, and another is operated in the equivalent capacitive reactive power state that sends; Like this, except direct current loss and the iron loss of reactor in system 2, the switching loss of the IGBT link that substantially do not consume energy outward, be in theory do not need to get from system can, overall efficiency can reach more than 99%.Fig. 5 and Fig. 6 have provided respectively 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 through after three coils of reactor 2 respectively, similarly, 2N 3 two of tested inverter units are one group, and the power of two tested inverter units equates in same group; Two 3, one of tested inverter units during controller unit is controlled same group are operated in the perceptual idle state that sends, and another is operated in the equivalent capacitive reactive power state that sends.
The control method of energy-conservation Inverter Experimental circuit of the present invention comprises the following steps:
A). tested inverter connects, and the tested inverter unit (3) that equates take power is as one group, with the output terminal that is connected to reference voltage generating unit (1) after reactor (2) is connected;
B). detection signal connects, and the busbar voltage test side of tested inverter unit is connected with controller unit, with the measurement of realization to busbar voltage; Output terminal at tested inverter unit arranges Hall current sensor, to realize the detection to tested inverter unit output current;
C). to busbar charging, controller unit is controlled the reference voltage generating unit, tested inverter unit carries out work, the bus of tested inverter unit is charged, until busbar voltage is stable;
D). output under the control of controller unit, is controlled the two same voltages of homophase frequently of inverters output in same group of tested inverter unit with the frequency in-phase voltage; And control the electric current that one of them tested inverter unit is exported the leading voltage pi/2, and 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, and 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, bus is pressed and carries out boosting rectifier control, keeps 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 surpassed ratings, 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 has reached the overcurrent protection value, 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, can realize the full power trial (FPT) of high power contravariant unit in the very little occasion of prime input capacity, has effectively saved electric energy and testing expenses, is a kind of energy-efficient test method.Energy-conservation Inverter Experimental circuit and control method of the present invention, provide voltage reference by the reference voltage generating unit, the paired unit that is connected in parallel in reference voltage output realizes that reactive power liquidates, the output that guarantees the reference voltage generating unit maintains zero energy substantially, only need to obtain seldom energy from grid side, effectively realized energy-conservation.
Claims (7)
1. energy-conservation Inverter Experimental 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 the reference voltage generating unit; The reference voltage generating unit comprises rectification circuit and inverter circuit, and the input end of rectification circuit is connected with extraneous three-phase supply, inverter circuit output three-phase reference voltage; Two tested inverter units are one group, and in same group of tested inverter unit, the power of inverter equates; Inverter circuit in reference voltage generating unit and tested inverter unit consists of 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 control end of the IGBT in the IGBT in the driving signal of controller unit output and reference voltage generating unit and tested inverter unit is connected; Two tested inverter units during controller unit is controlled same group, one is operated in the perceptual idle state that sends, and another is operated in the equivalent capacitive reactive power state that sends; N is positive integer.
2. energy-conservation Inverter Experimental 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 Experimental circuit according to claim 2, it is characterized in that: in the situation that tested inverter unit (3) 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 (1) through reactor (2), after another output of all single-phase H bridges links together, be connected on another output terminal of reference voltage generating unit.
4. energy-conservation Inverter Experimental circuit according to claim 2, it is characterized in that: in the situation that tested inverter unit (3) is three-phase two-level inverter unit or three-phase tri-level inverter unit, in the three-phase output of the three-phase of tested inverter unit output through being connected to the reference voltage generating unit after reactor (2).
5. energy-conservation Inverter Experimental circuit according to claim 1 and 2, it is characterized in that: described reference voltage generating unit (1) comprises signal processor (4) and coupled driving signal processor (5), data communication module (6), analog to digital conversion circuit (7) and current foldback circuit; Drive signal processor and be used for the driving signal of each IGBT of output and the operation information that detects each tested inverter unit (3); the data communication module realizes the communication with upper PC; analog to digital conversion circuit is used for transforming the output current of each tested inverter unit, and current foldback circuit is for generation of the overcurrent protection signal.
6. energy-conservation Inverter Experimental 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 the time-delay buffer circuit, and output terminal is provided with dc filter capacitor.
7. the control method based on the described energy-conservation Inverter Experimental circuit of claim 1, is characterized in that, comprises the following steps:
A). tested inverter connects, and the tested inverter unit (3) that equates take power is as one group, with the output terminal that is connected to reference voltage generating unit (1) after reactor (2) is connected;
B). detection signal connects, and the busbar voltage test side of tested inverter unit is connected with controller unit, with the measurement of realization to busbar voltage; Output terminal at tested inverter unit arranges Hall current sensor, to realize the detection to tested inverter unit output current;
C). to busbar charging, controller unit is controlled the reference voltage generating unit, tested inverter unit carries out work, the bus of tested inverter unit is charged, until busbar voltage is stable;
D). output under the control of controller unit, is controlled the two same voltages of homophase frequently of inverters output in same group of tested inverter unit with the frequency in-phase voltage; And control the electric current that one of them tested inverter unit is exported the leading voltage pi/2, and 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, and 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, bus is pressed and carries out boosting rectifier control, keeps 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 surpassed ratings, 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 has reached the overcurrent protection value, turn-off the operation of the tested inverter unit of this group.
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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 |
| CN109283410A (en) * | 2018-09-11 | 2019-01-29 | 长鑫存储技术有限公司 | Capacity measurement device and forming method thereof |
| 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 |
| CN110286316A (en) * | 2019-07-02 | 2019-09-27 | 中车大连机车研究所有限公司 | It is a kind of based on pure inductance to the power module total power test method and system dragged |
| CN110609182A (en) * | 2019-08-09 | 2019-12-24 | 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 |
| 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 |
| CN112415418A (en) * | 2020-10-23 | 2021-02-26 | 湖南中科电气股份有限公司 | Electromagnetic stirring variable frequency power supply fault detection circuit |
| CN112415418B (en) * | 2020-10-23 | 2022-05-24 | 湖南中科电气股份有限公司 | Electromagnetic stirring variable frequency power supply fault detection circuit |
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