CN103698641A - Energy feedback type electric equipment testing system and method - Google Patents
Energy feedback type electric equipment testing system and method Download PDFInfo
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- CN103698641A CN103698641A CN201310750208.0A CN201310750208A CN103698641A CN 103698641 A CN103698641 A CN 103698641A CN 201310750208 A CN201310750208 A CN 201310750208A CN 103698641 A CN103698641 A CN 103698641A
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Abstract
The invention relates to an energy feedback type electric equipment testing system and energy feedback type electric equipment testing method. The testing system comprises an electronic load, a controller, electric equipment and a current and voltage sampling module, wherein the electronic load is in tandem connection with a three-phase alternating current power supply, the electric equipment and the current and voltage sampling module are sequentially connected to the input end of the electronic load, the electric equipment is in parallel connection into the three-phase alternating current power supply, the controller is connected with the current and voltage sampling module and the electronic load respectively, and the electronic load comprises a rectifier module used for generating current and an inverter module used for energy feedback. The electronic load can be used for really simulating various limiting conditions in a power grid and used for detecting the influence of various reactive current, active current and harmonic current in the power grid on the electric equipment encountered by the electric equipment, through detection, on one hand, the optimizing and updating of the electric equipment are facilitated, and on the other hand, the defects brought by utilizing a ring opening testing manner in the prior art are also overcome.
Description
Technical field
The present invention relates to electric energy quality test technical field in electrical power trans mission/distribution system, relate in particular to a kind of energy-feedback consumer test macro and method.
Background technology
At present, various electric apparatus, civil electric appliance and nonlinear-load access electrical network in a large number, cause a large amount of reactive currents, harmonic current injection in the middle of electrical network, and the working environment of electrical network is intricate, influences each other and disturbs.These impacts have not only caused the increase greatly of grid power transmission loss, and can allow various consumer work not normal, on the other hand, existing consumer can only adopt the mode of emulation or reasoning to go to test the duty of consumer in harmonic current, reactive current environment, and in reality, great reactive current and harmonic current can cause damage to consumer, just have no way of having investigated.
In the prior art, also exist for simulating grid quality, electronic load that consumer is tested, this electron-like load mainly adopts open-loop test mode, namely adopt unitary variant, other parameter is specified in the situation that, to some performances of consumer or the secondary circuit of equipment detects, as, the content of harmonic current in test macro only, or tri-phase unbalance factor etc. in test macro only, in above-mentioned test, harmonic current and tri-phase unbalance factor are unitary variants, and other power factor (PF) etc. are all in specified category.Yet, in electrical power trans mission/distribution system, the factor such as harmonic current, power factor (PF), three-phase current unbalance coexists often, the detection of said method and monitoring result are all too desirable, the data that detect are also difficult to meet the demand of distribution system reality, are more difficult to real simulation to the on-the-spot running environment of distribution system.
Summary of the invention
Technical matters to be solved by this invention is for the above-mentioned problems in the prior art, provide a kind of for the various maximum conditions of simulating grid, there is energy-feedback consumer test macro and the method for reactive current, active current, harmonic current feedback function.
For addressing the above problem, a kind of technical scheme of the present invention is:
A kind of energy-feedback consumer test macro, described test macro comprises electronic load, controller, consumer and for gathering the current-voltage sampling module of electronic load input end electric current and voltage, electronic load is serially connected in three-phase electricity, consumer, current-voltage sampling module are connected on the input end of electronic load in turn, described consumer access in parallel three-phase electricity, controller is connected with electronic load with current-voltage sampling module respectively, described electronic load comprises that rectification module is connected with inversion module, rectification module and the control end being equipped with on inversion module for being connected with controller for generation of the rectification module of electric current and for the inversion module of energy back, in described rectification module, be provided with the active current rectification unit for generation of active current, for generation of the reactive current rectification unit of reactive current with for generation of the harmonic current rectification unit of harmonic current, in inversion module, be provided with for absorbing the active current inversion unit of the active current of meritorious current commutates unit generation, for absorbing the reactive current inversion unit of the reactive current that reactive current rectification unit produces and for absorbing the harmonic current inversion unit of the harmonic current that harmonic current rectification unit produces, active current inversion unit is connected with active current rectification unit, reactive current inversion unit is connected with reactive current rectification unit, harmonic current inversion unit is connected with harmonic current rectification unit.
Preferably, described active current rectification unit comprises in turn connected three-phase and four-line switch S 1, four phase reactor L1 and rectifier MK1, three-phase and four-line switch S 1 is connected with the neutral line with triple-phase line respectively, described active current inversion unit comprises in turn connected three-phase and four-line switch S 2, four phase reactor L2 and rectifier MK2, three-phase and four-line switch S 2 is connected with the neutral line with triple-phase line respectively, the DC side of rectifier MK1 and rectifier MK2 shares a capacitor C, and described rectifier MK1 and rectifier MK2 are voltage-type semibridge system PWM rectifier; The circuit of described reactive current rectification unit and harmonic wave current commutates units shared active current rectification unit, the circuit of described reactive current inversion unit and harmonic wave current inversion units shared active current inversion unit.
Preferably, described rectifier MK1 and rectifier MK2 include A commutating phase device, B commutating phase device, C commutating phase device and N commutating phase device, each commutating phase device comprises respectively two brachium pontis, each brachium pontis includes an insulated gate bipolar transistor and is connected in reverse parallel in the rectification diode between the emitter and collector of insulated gate bipolar transistor, and the grid of each insulated gate bipolar transistor is control end.
Be compared to prior art, energy-feedback consumer test macro of the present invention can simulate the various maximum conditions in electrical network really by electronic load, electronic load can simulate simultaneous active current in electrical network by rectification module, reactive current, harmonic current and tri-phase unbalance factor, active current rectification module being produced by inversion module, reactive current and harmonic current carry out energy recovery, tri-phase unbalance factor is compensated, avoided active current, the access such as reactive current and harmonic current electrical network, energy recovery rate is high, energy-conserving and environment-protective, simultaneously, also can simulate other the various maximum conditions in electrical network, for detection of the various conditions in electrical network on the impact of consumer and carry out burn-in test, detect consumer all kinds of reactive currents, active current and harmonic current impact on self in meeting with electrical network, by detecting, be conducive on the one hand the optimization and upgrading of consumer self, also avoided on the other hand the drawback of utilizing open-loop test mode to bring in prior art, meanwhile, electronic load produces rectification module active current, reactive current and harmonic current carry out energy recycling, energy-conserving and environment-protective.
An energy-feedback consumer method of testing, described method of testing is based on the above-mentioned consumer test macro of mentioning, and described method of testing comprises the steps:
A) consumer test macro access electrical network, consumer is normally worked;
B) electric current and the voltage of current-voltage sampling module Real-time Collection electronic load input end, and the electric current collecting and voltage are input in controller and are processed, by controller, output a control signal in electronic load;
C) under the control of controller, active current rectification unit in rectification module, reactive current rectification unit and harmonic wave current commutates unit produce respectively active current, reactive current and the harmonic current for testing consumer and are input to consumer, the duty of test consumer under the electric active current of difference, reactive current and harmonic current;
D) under the control of controller, inversion module is according to the active current producing in rectification module, reactive current and harmonic current, export active current, reactive current and harmonic current that corresponding electric current and harmonic current produce to offset rectification module, the three-phase electricity circulation after inversion feeds back in electrical network.
Preferably, described steps d is specially: under the control of controller, active current inversion unit produces reverse active current, reactive current inversion unit produces reverse reactive current, harmonic current inversion unit produces reverse harmonic current, the active current of active current rectification unit generation and reverse active current are offseted, the reactive current that reactive current rectification unit produces and reverse reactive current offset, and the harmonic current that harmonic current rectification unit produces and reverse harmonic current offset.
Be compared to prior art, consumer method of testing of the present invention can simulate the various maximum conditions in electrical network really by electronic load, detect consumer all kinds of reactive currents, active current and harmonic current impact on self in meeting with electrical network, by detecting, be conducive on the one hand the optimization and upgrading of consumer self, also avoided on the other hand the drawback of utilizing open-loop test mode to bring in prior art; Meanwhile, electronic load produces rectification module active current, reactive current and harmonic current carry out energy recycling, energy-conserving and environment-protective.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of energy-feedback consumer test macro of the present invention.
Fig. 2 is the schematic block circuit diagram of electronic load in energy-feedback consumer test macro of the present invention.
Fig. 3 is the circuit diagram of electronic load in energy-feedback consumer test macro of the present invention.
Embodiment
Below in conjunction with drawings and Examples, further describe the present invention, but protection scope of the present invention is not limited to this.
With reference to Fig. 1, energy-feedback consumer test macro of the present invention comprises electronic load, controller, consumer and for gathering the current-voltage sampling module of electronic load input end electric current and voltage, electronic load is serially connected in three-phase electricity, consumer, current-voltage sampling module are connected on the input end of electronic load in turn, consumer access in parallel three-phase electricity, controller is connected with electronic load with current-voltage sampling module respectively.Consumer test macro is used for studying the impact on consumer of active current, reactive current and harmonic current, and by electronic load, simulates under various extreme conditions the operating characteristic of consumer.Consumer in consumer test macro also can replace with all kinds of power supply products, utilize consumer test macro to carry out aging test to power supply product, and can simulate the load of various characteristics: as inductive load, capacitive load, resistive load and various nonlinear load.
With reference to Fig. 2, electronic load comprises rectification module and inversion module, and rectification module is connected with inversion module, rectification module and the control end being equipped with on inversion module for being connected with controller, and controller is for controlling the output of rectification module and inversion module.Rectification module is for generation of all kinds of harmonic currents, three-phase load degree of unbalancedness load, active current and reactive current etc., and all kinds of electric currents that inversion module produces for absorbing rectification module, by after inversion module inversion, more than 80% power cycles being utilized.
In described rectification module, be provided with active current rectification unit for generation of active current, for generation of the reactive current rectification unit of reactive current with for generation of the harmonic current rectification unit of harmonic current.Harmonic current number of times and the harmonic content of the output of harmonic current rectification unit are adjustable continuously, and load harmonic wave scope is 1-25 time, can study mechanism and control measures that harmonic wave exerts an influence to consumer.In inversion module, be provided with active current inversion unit, reactive current inversion unit and harmonic wave current inversion unit, the active current that active current inversion unit produces for absorbing meritorious current commutates unit, the reactive current that reactive current inversion unit produces for absorbing reactive current rectification unit, the harmonic current that harmonic current inversion unit produces for absorbing harmonic current rectification unit, active current inversion unit is connected with active current rectification unit, reactive current inversion unit is connected with reactive current rectification unit, harmonic current inversion unit is connected with harmonic current rectification unit.
With reference to Fig. 3, active current rectification unit comprises in turn connected three-phase and four-line switch S 1, four phase reactor L1 and rectifier MK1, three-phase and four-line switch S 1 is connected with triple-phase line a, b, c and neutral line n respectively, each voltage of going up is mutually labeled as respectively Ua, Ub, Uc and Un in Fig. 3, four phase reactor L1 are the additional reactor of AC, play the effect of balanced voltage, support reactive power in the circuit of rectifier MK1.Described active current inversion unit comprises in turn connected three-phase and four-line switch S 2, four phase reactor L2 and rectifier MK2, three-phase and four-line switch S 2 is connected with triple-phase line a ', b ', c ' and neutral line n ' respectively, each voltage of going up is mutually labeled as respectively Ua ', Ub ', Uc ' and Un ' in Fig. 3, the DC side of rectifier MK1 and rectifier MK2 shares a capacitor C, capacitor C is the Support Capacitor between rectifier MK1 and rectifier MK2, and described rectifier MK1 and rectifier MK2 are voltage-type semibridge system PWM rectifier.Rectifier MK1 comprises A commutating phase device K01, B commutating phase device K02, C commutating phase device K03 and N commutating phase device K04, rectifier MK2 comprises A commutating phase device K11, B commutating phase device K12, C commutating phase device K13 and N commutating phase device K14, each commutating phase device comprises respectively two brachium pontis, each brachium pontis includes an insulated gate bipolar transistor IGBT and is connected in reverse parallel in the rectification diode between the emitter and collector of insulated gate bipolar transistor, and the grid of each insulated gate bipolar transistor is control end.
Wherein, the circuit of reactive current rectification unit and harmonic wave current commutates units shared active current rectification unit, it is the rectification that the circuit of active current rectification unit completes active current, reactive current and harmonic current simultaneously, the circuit of reactive current inversion unit and harmonic wave current inversion units shared active current inversion unit, the circuit of active current inversion unit completes the inversion of active current, reactive current and harmonic current simultaneously.
Electronic load, with three-phase and four-line connecting system, also can be installed consumer the space of temperature controllable and humidity, for the loss characteristic test of different temperatures and humidity situation.Energy-feedback consumer test macro of the present invention is when work, by controller Real-Time Monitoring power network current, voltage signal, by the analog voltage signal sampling by being converted to digital signal, the digital signal of being sent into by controller is processed, produce control signal in electronic load, control rectification module and produce active current, reactive current and harmonic current, and with pulse-width signal form, each insulated gate bipolar transistor IGBT is controlled.Electronic load is in operational process, and the ac input end Ua of brachium pontis and Ub will produce PWM ripple Uab, in PWM ripple Uab, contain and input sinusoidal signal ripple same frequency and the proportional fundametal compoment of amplitude, and the very high harmonic wave of the frequency relevant with triangular carrier.PWM ripple Uab is upper in four phase reactor L1 with line voltage Us acting in conjunction, has produced Sinusoidal Input Currents Is.When line voltage Us mono-timing, the amplitude of Sinusoidal Input Currents Is and phase place are only determined by PWM ripple Uab, by controlling amplitude and the phase place of the voltage U ab of rectification module AC, just can obtain the input current Is of required size and phase place.
When Sinusoidal Input Currents Is and the same phase time of line voltage Us, circuit moves as rectification, otherwise circuit is as inverter operation.Rectifier MK1 and rectifier MK2 have the AC/DC translation function of energy transmitted in both directions function, when rectifier absorbs energy from electrical network, this rectifier runs on rectification duty, and when PWM rectifier is during to electrical network electric energy transmitting, it runs on active inversion duty.In the present invention, rectifier MK1 operates mainly in rectifier pattern as electronic load, realizes according to demand various current waveforms, comprises the generation of active current, reactive current, harmonic current etc.Rectifier MK2 operates mainly in active inversion pattern, its groundwork be energy feedback that rectifier MK1 is absorbed to electrical network, meanwhile, filtering enters the harmonic current of electrical network, thereby realizes energy recycling.
The harmonic current that inversion module of the present invention can produce rectification module and reactive power are carried out active power filtering and reactive-load compensation and are reclaimed, to after the energy inversion of recovery, turn back to electrical network again, the energy recovery rate of whole system is more than 95% after tested, power factor >=0.99, the percent harmonic distortion of electric current is low.
Energy-feedback consumer method of testing of the present invention, the consumer test macro of method of testing based on above-mentioned, comprises the steps:
A) consumer test macro access electrical network, consumer is normally worked;
B) electric current and the voltage of current-voltage sampling module Real-time Collection electronic load input end, and the electric current collecting and voltage are input in controller and are processed, by controller, output a control signal in electronic load;
C) under the control of controller, active current rectification unit in rectification module, reactive current rectification unit and harmonic wave current commutates unit produce respectively active current, reactive current and the harmonic current for testing consumer and are input to consumer, the duty of test consumer under different active currents, reactive current and harmonic current;
D) under the control of controller, inversion module is according to the active current producing in rectification module, reactive current and harmonic current, export active current, reactive current and harmonic current that corresponding electric current produces to offset rectification module, three-phase electricity circulation after filtering feeds back in electrical network.Be specially under the control of controller, active current inversion unit produces reverse active current, reactive current inversion unit produces reverse reactive current, harmonic current inversion unit produces reverse harmonic current, the active current of active current rectification unit generation and reverse active current are offseted, the reactive current that reactive current rectification unit produces and reverse reactive current offset, and the harmonic current that harmonic current rectification unit produces and reverse harmonic current offset.
In above-mentioned explanation, all special instructions that do not add, all adopt technological means of the prior art.
Claims (5)
1. an energy-feedback consumer test macro, it is characterized in that, described test macro comprises electronic load, controller, consumer and for gathering the current-voltage sampling module of electronic load input end electric current and voltage, electronic load is serially connected in three-phase electricity, consumer, current-voltage sampling module are connected on the input end of electronic load in turn, described consumer access in parallel three-phase electricity, controller is connected with electronic load with current-voltage sampling module respectively, described electronic load comprises that rectification module is connected with inversion module, rectification module and the control end being equipped with on inversion module for being connected with controller for generation of the rectification module of electric current and for the inversion module of energy back, in described rectification module, be provided with the active current rectification unit for generation of active current, for generation of the reactive current rectification unit of reactive current with for generation of the harmonic current rectification unit of harmonic current, in inversion module, be provided with for absorbing the active current inversion unit of the active current of meritorious current commutates unit generation, for absorbing the reactive current inversion unit of the reactive current that reactive current rectification unit produces and for absorbing the harmonic current inversion unit of the harmonic current that harmonic current rectification unit produces, active current inversion unit is connected with active current rectification unit, reactive current inversion unit is connected with reactive current rectification unit, harmonic current inversion unit is connected with harmonic current rectification unit.
2. energy-feedback consumer test macro according to claim 1, it is characterized in that, described active current rectification unit comprises in turn connected three-phase and four-line switch S 1, four phase reactor L1 and rectifier MK1, three-phase and four-line switch S 1 is connected with the neutral line with triple-phase line respectively, described active current inversion unit comprises in turn connected three-phase and four-line switch S 2, four phase reactor L2 and rectifier MK2, three-phase and four-line switch S 2 is connected with the neutral line with triple-phase line respectively, the DC side of rectifier MK1 and rectifier MK2 shares a capacitor C, described rectifier MK1 and rectifier MK2 are voltage-type semibridge system PWM rectifier, the circuit of described reactive current rectification unit and harmonic wave current commutates units shared active current rectification unit, the circuit of described reactive current inversion unit and harmonic wave current inversion units shared active current inversion unit.
3. energy-feedback consumer test macro according to claim 2, it is characterized in that, described rectifier MK1 and rectifier MK2 include A commutating phase device, B commutating phase device, C commutating phase device and N commutating phase device, each commutating phase device comprises respectively two brachium pontis, each brachium pontis includes an insulated gate bipolar transistor and is connected in reverse parallel in the rectification diode between the emitter and collector of insulated gate bipolar transistor, and the grid of each insulated gate bipolar transistor is control end.
4. an energy-feedback consumer method of testing, is characterized in that, the energy-feedback consumer test macro of described method of testing based on described in claim 1-3 any one, and described method of testing comprises the steps:
A) energy-feedback consumer test macro access electrical network, consumer is normally worked;
B) electric current and the voltage of current-voltage sampling module Real-time Collection electronic load input end, and the electric current collecting and voltage are input in controller and are processed, by controller, output a control signal in electronic load;
C) under the control of controller, active current rectification unit in rectification module, reactive current rectification unit and harmonic wave current commutates unit produce respectively active current, reactive current and the harmonic current for testing consumer and are input to consumer, the duty of test consumer under different active currents, reactive current and harmonic current;
D) under the control of controller, inversion module is according to the active current producing in rectification module, reactive current and harmonic current, export active current, reactive current and harmonic current that corresponding electric current produces to offset rectification module, the three-phase electricity circulation after inversion feeds back in electrical network.
5. energy-feedback consumer method of testing according to claim 4, it is characterized in that, described steps d is specially: under the control of controller, active current inversion unit produces reverse active current, reactive current inversion unit produces reverse reactive current, harmonic current inversion unit produces reverse harmonic current, the active current of active current rectification unit generation and reverse active current are offseted, the reactive current that reactive current rectification unit produces and reverse reactive current offset, the harmonic current that harmonic current rectification unit produces and reverse harmonic current offset.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104655990A (en) * | 2015-03-16 | 2015-05-27 | 贵州电力试验研究院 | Medium and low-voltage power distribution network simulation system based on energy feedback |
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