CN104375039A - Testing system for isolation type direct-current transformer - Google Patents
Testing system for isolation type direct-current transformer Download PDFInfo
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- CN104375039A CN104375039A CN201410673327.5A CN201410673327A CN104375039A CN 104375039 A CN104375039 A CN 104375039A CN 201410673327 A CN201410673327 A CN 201410673327A CN 104375039 A CN104375039 A CN 104375039A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/10—Flexible AC transmission systems [FACTS]
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Abstract
A testing system for an isolation type direct-current transformer comprises a direct-current main power source and an energy feedback control direct-current power source, wherein the alternating-current input end of the direct-current main power source is connected with a three-phase power source, and the direct-current output end of the direct-current main power source is connected with the input end of the tested isolation type direct-current transformer; the alternating-current input end of the energy feedback control direct-current power source is connected with the three-phase power source, the positive pole on the direct-current output side of the energy feedback control direct-current power source is connected with the positive pole of the direct-current main power source, the negative pole on the direct-current output side of the energy feedback control direct-current power source is connected with the positive pole on the output side of the tested isolation type direct-current transformer, and the negative pole on the input side and the negative pole on the output side of the tested isolation type direct-current transformer are in short circuit. As the energy feedback control direct-current power source is arranged in the testing experimental system for testing the isolation type direct-current transformer, by means of the control over the output voltage, the testing power can be adjusted, and energy can be fed back; the requirement for the capacity of the testing main power source of the system is lowered, it is unnecessary to arrange a large-capacity load, and investment in a testing platform and energy consumption in the testing process are reduced to the greatest extent.
Description
Technical field
The present invention relates to a kind of for testing the experimental system of isolated DC transformer (DC-DC converter), belonging to transformer technology field.
Background technology
Along with the progress of the technology such as high-power electric and electronic switching device and novel ferromagnetic material, the electric power electric transformer based on medium/high frequency transformer and high-power AC/DC convertor is subject to people's attention day by day.Electric power electric transformer, also referred to as solid-state transformer, for traditional power frequency electric power transformer, owing to have employed high frequency technology, the weight and volume of transformer all greatly reduces, in addition the application of novel ferromagnetic material (as non-crystaline amorphous metal and nanocrystalline), the loss of transformer also reduces further.
As the core building block of high-power electric and electronic transformer, rated voltage and the rated current of isolated DC transformer (DC-DC converter) all have a distinct increment, thus have higher requirement to test platform.The most basic function of isolated DC transformer is exactly energy transferring, and therefore, its basic test project comprises power test and controlling functions test.When adopting conventional test methodologies to carry out total power test to isolated DC transformer, need Large Copacity power source supplies power to export on the one hand, also need the corresponding power of load consumption on the other hand, realize energy transferring.Not only cost is higher for such large power test platform, and waste of energy is serious, is therefore necessary to be improved.
Summary of the invention
The object of the invention is to the drawback for prior art, a kind of isolated DC Testing System of Transformer is provided, to reduce the construction cost of test platform, reduce the waste of electric energy.
Problem of the present invention realizes with following technical proposals:
A kind of isolated DC Testing System of Transformer, formation comprises direct current primary power and energy feedback controls direct supply, the ac input end of described direct current primary power connects three-phase supply, its DC output end connects the input end of tested isolated DC transformer, the ac input end that described energy feedback controls direct supply connects three-phase supply, the positive pole of its DC output side is connected with the positive pole of direct current primary power, negative pole is connected with the positive pole of tested isolated DC transformer outgoing side, the negative pole of the input side of tested isolated DC transformer and the negative pole short circuit of outgoing side.
Above-mentioned isolated DC Testing System of Transformer, described direct current primary power comprises three winding phase-shifting transformer, first smoothing reactor, two three-phase thyristor full-controlled rectifier bridges and two filter capacitors, the input winding of three winding phase-shifting transformer connects three-phase supply, be connected to the input end of tested isolated DC transformer through the first smoothing reactor after two three-phase thyristor full-controlled rectifier bridges are connected in series, their input end connects the difference output winding of three winding phase-shifting transformer respectively, the input end of tested isolated DC transformer is connected to after two filter capacitors are connected in series, the serial connection point ground connection of the two.
Above-mentioned isolated DC Testing System of Transformer, also comprises the second smoothing reactor in formation, and described second smoothing reactor is connected to direct current primary power and energy feedback controls between the positive pole of the outgoing side of direct supply.
Above-mentioned isolated DC Testing System of Transformer, described energy feedback controls direct supply and comprises three-phase transformer, uncontrollable rectifier device and DC voltage regulator circuit, the input termination three-phase supply of described three-phase transformer, output terminal is powered to DC voltage regulator circuit through uncontrollable rectifier device, the positive pole of the outgoing side of described DC voltage regulator circuit is connected with the positive pole of direct current primary power, negative pole is connected with the positive pole of tested isolated DC transformer outgoing side, the measured power of tested isolated DC transformer carries out the control of closed loop indifference by PI controller, the input signal of described PI controller be the power of the actual output of tested object and power given between error signal, export the control inputs signal for DC voltage regulator circuit.
Above-mentioned isolated DC Testing System of Transformer, described DC voltage regulator circuit is buck circuit, described buck circuit comprises buck chopper switch S 0, buck chopper diode D1 and buck chopper reactor L3, the positive pole of uncontrollable rectifier device outgoing side connects the positive pole of direct current primary power successively through buck chopper switch S 0 and buck chopper reactor L3, the positive pole of described buck chopper diode D1 connects the negative pole of uncontrollable rectifier device outgoing side and the positive pole of tested isolated DC transformer outgoing side, its negative pole connects the serial connection point of buck chopper switch S 0 and buck chopper reactor L3.
Above-mentioned isolated DC Testing System of Transformer, described DC voltage regulator circuit is isolated form DC/DC translation circuit, described isolated form DC/DC translation circuit comprises the 3rd filter capacitor C3, 4th filter capacitor C4, 3rd smoothing reactor L4, high-frequency isolation transformer Tx, four electronic switches and two commutation diodes, 3rd filter capacitor C3 is connected on the output terminal of uncontrollable rectifier device, four electronic switches are connected into single-phase full bridge inverter circuit, the direct-flow input end of this single-phase full bridge inverter circuit connects the output voltage of uncontrollable rectifier device, ac output end connects the input end of high-frequency isolation transformer Tx, the alternating voltage that high-frequency isolation transformer Tx exports first carries out full-wave rectification by two commutation diodes, the DC voltage obtained after the 3rd smoothing reactor L4 and the 4th filter capacitor C4 filtering is again as the output voltage of DC voltage regulator circuit.
The present invention is configured with energy feedback and controls direct supply in isolated DC transformer testing experimental system, not only can regulate measured power, but also can realize energy feedback by controlling its output voltage.Which system reduces the requirement to test primary power capacity, also do not need to configure big capacity load, thus farthest decrease the energy ezpenditure in the investment of test platform and test process.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is electrical schematic diagram of the present invention;
Fig. 2 is DC voltage regulator circuit schematic diagram;
Fig. 3 is energy feedback control block diagram.
In Fig. 1, each list of reference numerals is: DC/DC, d-c transformer, T1, three winding phase-shifting transformer, T2, three-phase transformer, Z, uncontrollable rectifier device, G, DC voltage regulator circuit, Q1, the first full-controlled rectifier bridge, Q2, the second full-controlled rectifier bridge, L1, the first smoothing reactor, L2, the second smoothing reactor, C1, the first filter capacitor, C2, the second filter capacitor.
In Fig. 2, each list of reference numerals is: S0, buck chopper switch, D1, buck chopper diode, L3, buck chopper reactor, C3, the 3rd filter capacitor, C4, the 4th filter capacitor, S1 ~ S4, the first electronic switch ~ the 4th electronic switch, Tx, high-frequency isolation transformer, D21, the first commutation diode, D22, the second commutation diode, L4, the 3rd smoothing reactor.
Embodiment
The present invention proposes the experimental system for isolated DC transformer testing and energy back-feed control method.Experimental system is proposed as shown in Figure 1, experiment porch mainly comprises following three parts:
1) direct current primary power: for test provides DC voltage Uin, based on security consideration, positive and negative DC bus can be adopted to design.Direct current primary power adopts the classical 12 pulsation rectification circuits based on thyristor, and the neutral earthing of DC side derided capacitors, to reduce the restriction of device to insulating requirements.
2) energy feedback controls direct supply: provide the adjustable dc voltage Uc sealing in test loop.When needs provide energy feedback, by changing the electric current in the DC voltage size adjustment loop sealed in, thus change the power of electric power electric transformer transmission.
3) tested object: d-c transformer, realizes power transimission and voltage transformation, and input direct voltage is Uin, and output DC voltage is Uout.Give an example topology of this quasi-converter in Fig. 1, the tested object that the present invention is directed to is not limited to sample topology.
When tested object can be controlled by the control realization power of self and voltage swing regulates time, the output voltage Uc that energy feedback controls direct supply is zero, does not namely need the energy feedback added to control.When tested object can not ACTIVE CONTROL through-put power size time, need energy feedback to control direct supply regulation output DC voltage Uc, realize the control to tested object through-put power size.
Fig. 2 is two kinds of ways of realization that described energy feedback controls DC voltage regulator circuit in direct supply, and wherein, (a) is buck circuit, and (b) is isolated form DC/DC regulating circuit.Two kinds of circuit all control by electronic power switch device (as IGBT), and reach the object of regulation output DC voltage, its control method is provided by Fig. 3.
Fig. 3 is energy feedback control block diagram, gives the concrete methods of realizing that energy feedback controls.In Fig. 3, Pref is the power (power is given) that tested object needs to export, and Pout is the power (Feedback of Power) of the actual output of tested object, and its value is the product of electric current I c circulated in the DC voltage Uout of tested object output and energy feedback loop.Energy feedback controls the error between employing PI controller regulating power given Pref and Feedback of Power Pout, realizes the non differential regulation of power.The output d of PI controller is the dutycycle of buck circuit or the phase-shift control angle of isolated form DC/DC regulating circuit, by the change regulable control voltage U c of d, finally realizes the adjustment of energy feedback loop power size.Concrete principle is:
By the voltage relationship shown in Fig. 1 circuit, have
，
And by the operating characteristic of tested object, can obtain
，
Wherein, Zeq is the equivalent impedance of tested object.Be not difficult to find out by above-mentioned two formulas, regulation voltage Uc, the output DC voltage Uout of tested object will change thereupon, and then the electric current I c of backfeed loop is changed, finally make actual Feedback of Power value Pout reach power set-point, realize the non differential regulation of power.
When described DC voltage regulator circuit adopts the buck circuit shown in Fig. 2 (a), d is the dutycycle of main switch S0, according to the principle of work of buck circuit, VD Uc is the product of d and DC voltage regulator circuit input voltage, when this input voltage is constant and when regulating d, can change the output voltage Uc of DC voltage regulator circuit.
When described DC voltage regulator circuit adopts the isolated form DC/DC regulating circuit shown in Fig. 2 (b), d is the phase-shift control angle (0 ° < d < 180 °) of the single-phase full bridge inverter circuit that S1 ~ S4 is formed, according to the principle of work of this circuit, VD Uc and d/180 °, DC voltage regulator circuit input voltage and Tx no-load voltage ratio are directly proportional, when this input voltage and Tx no-load voltage ratio constant and when regulating d, the output voltage Uc of DC voltage regulator circuit can be changed.
The present invention has following characteristics and function:
1) experimental system can be used for isolated DC transformer testing, has energy feedback function.
2) experimental system is made up of direct current primary power, energy feedback control direct supply and tested object three part.
3) watt level of the control break energy feedback loop of DC power output voltage is controlled by energy feedback.
4) energy feedback controls to adopt the closed-loop control of PI control realization power, making device realizing the same of energy feedback, achieving power controllable, meeting testing requirement.
Implementation step of the present invention:
1) set up experimental system as shown in Figure 1, the DC bus of certain voltage is provided, be convenient to d-c transformer access.The electric pressure of DC bus, according to the requirement of tested object, carries out closed loop adjustment by the direct current primary power based on 12 pulse rectification.Particularly, direct current primary power is made up of three winding phase-shifting transformer T1, two three-phase thyristor full-controlled rectifier bridges, two filter capacitors and the first smoothing reactor L1.Adopt DC voltage feedback technique, control the Trigger Angle of thyristor, the accurate control of DC bus-bar voltage can be realized.
2) DC output end energy feedback being controlled direct supply is connected serially to the energy feedback loop of d-c transformer.Particularly, energy feedback controls direct supply and provides suitable alternating voltage by three-phase transformer T2, provides first order DC voltage by three-phase uncontrollable rectifier device Z, and the DC voltage regulator circuit fed back by belt current (power) exports second level adjustable dc voltage.In order to improve the current waveform in energy feedback loop, also connected in loop the second smoothing reactor L2.
3) adjustment of energy feedback power loop size.Adopt the error between the given and Feedback of Power of PI controller regulating power, realize non differential regulation, as shown in Figure 3, the output d of PI controller is dutycycle or the phase-shift control angle of DC voltage regulator circuit, by the change regulable control voltage U c of d, finally realize the adjustment of energy feedback power loop size.
The present invention can realize the power test of d-c transformer, is particularly useful for the d-c transformer without active power control ability.
Claims (6)
1. an isolated DC Testing System of Transformer, it is characterized in that, it comprises direct current primary power and energy feedback controls direct supply, the ac input end of described direct current primary power connects three-phase supply, its DC output end connects the input end of tested isolated DC transformer (DC/DC), the ac input end that described energy feedback controls direct supply connects three-phase supply, the positive pole of its DC output side is connected with the positive pole of direct current primary power, negative pole is connected with the positive pole of tested isolated DC transformer (DC/DC) outgoing side, the negative pole of input side of tested isolated DC transformer (DC/DC) and the negative pole short circuit of outgoing side.
2. isolated DC Testing System of Transformer according to claim 1, it is characterized in that, described direct current primary power comprises three winding phase-shifting transformer (T1), first smoothing reactor (L1), two three-phase thyristor full-controlled rectifier bridges and two filter capacitors, the input winding of three winding phase-shifting transformer (T1) connects three-phase supply, be connected to the input end of tested isolated DC transformer (DC/DC) through the first smoothing reactor (L1) after two three-phase thyristor full-controlled rectifier bridges are connected in series, their input end connects the difference output winding of three winding phase-shifting transformer (T1) respectively, the input end of tested isolated DC transformer (DC/DC) is connected to after two filter capacitors are connected in series, the serial connection point ground connection of the two.
3. isolated DC Testing System of Transformer according to claim 2, it is characterized in that, also comprise the second smoothing reactor (L2) in formation, described second smoothing reactor (L2) is connected to direct current primary power and energy feedback controls between the positive pole of the outgoing side of direct supply.
4. isolated DC Testing System of Transformer according to claim 1 and 2, it is characterized in that, described energy feedback controls direct supply and comprises three-phase transformer (T2), uncontrollable rectifier device (Z) and DC voltage regulator circuit (G), the input termination three-phase supply of described three-phase transformer (T2), output terminal is powered to DC voltage regulator circuit (G) through uncontrollable rectifier device (Z), the positive pole of the outgoing side of described DC voltage regulator circuit (G) is connected with the positive pole of direct current primary power, negative pole is connected with the positive pole of tested isolated DC transformer (DC/DC) outgoing side, the measured power of tested isolated DC transformer (DC/DC) carries out the control of closed loop indifference by PI controller, the input signal of described PI controller be the power of the actual output of tested object and power given between error signal, export the control inputs signal for DC voltage regulator circuit (G).
5. isolated DC Testing System of Transformer according to claim 4, it is characterized in that, described DC voltage regulator circuit (G) is buck circuit, described buck circuit comprises buck chopper switch (S0), buck chopper diode (D1) and buck chopper reactor (L3), the positive pole of uncontrollable rectifier device (Z) outgoing side connects the positive pole of direct current primary power successively through buck chopper switch (S0) and buck chopper reactor (L3), the positive pole of described buck chopper diode (D1) connects the negative pole of uncontrollable rectifier device (Z) outgoing side and the positive pole of tested isolated DC transformer (DC/DC) outgoing side, its negative pole connects the serial connection point of buck chopper switch (S0) and buck chopper reactor (L3).
6. isolated DC Testing System of Transformer according to claim 5, it is characterized in that, described DC voltage regulator circuit (G) is isolated form DC/DC translation circuit, described isolated form DC/DC translation circuit comprises the 3rd filter capacitor (C3), 4th filter capacitor (C4), 3rd smoothing reactor (L4), high-frequency isolation transformer (Tx), four electronic switches and two commutation diodes, 3rd filter capacitor (C3) is connected on the output terminal of uncontrollable rectifier device (Z), four electronic switches are connected into single-phase full bridge inverter circuit, the direct-flow input end of this single-phase full bridge inverter circuit connects the output voltage of uncontrollable rectifier device (Z), ac output end connects the input end of high-frequency isolation transformer (Tx), the alternating voltage that high-frequency isolation transformer (Tx) exports first carries out full-wave rectification by two commutation diodes, the DC voltage obtained after the 3rd smoothing reactor (L4) and the 4th filter capacitor (C4) filtering is again as the output voltage of DC voltage regulator circuit (G).
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| CN201410673327.5A CN104375039B (en) | 2014-11-21 | 2014-11-21 | Testing system for isolation type direct-current transformer |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104849588A (en) * | 2015-05-05 | 2015-08-19 | 河南职业技术学院 | Test system for frequency converters |
| CN105717388A (en) * | 2015-12-08 | 2016-06-29 | 国家电网公司 | Transformer test platform |
| CN106291012A (en) * | 2016-08-26 | 2017-01-04 | 深圳市伊力科电源有限公司 | Programmable DC power supply realizes system and method |
| CN106645916A (en) * | 2015-10-29 | 2017-05-10 | 国网智能电网研究院 | Power test system of high-voltage DC-DC converter |
| CN108599592A (en) * | 2018-06-06 | 2018-09-28 | 三峡大学 | A kind of modularization isolated form large capacity high-gain rectifier |
| CN108809138A (en) * | 2018-06-29 | 2018-11-13 | 西安特锐德智能充电科技有限公司 | A kind of two-way ACDC circuits and its control method of compatible three-phase and single phase alternating current power supply |
| CN108879623A (en) * | 2018-06-13 | 2018-11-23 | 南京南瑞继保电气有限公司 | A kind of multi-voltage grade DC grid system and control guard method |
| CN109725267A (en) * | 2017-10-31 | 2019-05-07 | 南方电网科学研究院有限责任公司 | A kind of the test circuit and its test method of solid-state transformer |
| CN113567877A (en) * | 2021-06-09 | 2021-10-29 | 国电南瑞科技股份有限公司 | ISOP type direct current transformer power module test circuit and test method |
| CN113917227A (en) * | 2021-10-09 | 2022-01-11 | 广东电网有限责任公司 | Energy circulation detection system and method for power module of direct-current transformer |
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| CN113567877A (en) * | 2021-06-09 | 2021-10-29 | 国电南瑞科技股份有限公司 | ISOP type direct current transformer power module test circuit and test method |
| CN113917227A (en) * | 2021-10-09 | 2022-01-11 | 广东电网有限责任公司 | Energy circulation detection system and method for power module of direct-current transformer |
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