CN103675563A - Energy-saving multifunctional power test system - Google Patents
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Abstract
The invention relates to an energy-saving multifunctional power test system. The energy-saving multifunctional power test system comprises a controller, a step-up transformer, a high-voltage impedance simulator, a step-down transformer, a low-voltage impedance simulator, a load simulator, a first data acquisition unit and a second data acquisition unit, wherein the step-up transformer, the high-voltage impedance simulator, the step-down transformer, the low-voltage impedance simulator and the load simulator are connected sequentially, an input terminal of the step-up transformer is connected with a three-phase power supply, an output terminal of the load simulator is connected with the input terminal of the step-up transformer, and the load simulator comprises a rectification module and an inversion module. The energy-saving multifunctional power test system has the advantages that power quality parameters and various extreme conditions of a power transmission and distribution system can be truly simulated, and the power loss of each power transmission and distribution device can be monitored online under the condition of various simulated loads so that the energy saving effect and operating characteristics of each power transmission and distribution device is really reflected, and under the influence of different power transmission devices, the energy loss degree of a power grid and the economical operation of the transformers are really reflected.
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-saving multifunction power test system that is applicable to mesolow electrical power trans mission/distribution system.
Background technology
Electricity generation system is sent clean electric energy via the conveying of transmission system, finally by distribution system, be assigned on each user's electronic load, in this process, exist various transmission facilities as the impact of transformer, transmission line of electricity etc., also exist various controller switching equipments as impacts such as air-conditioning, water heater and transmission lines of electricity, and the difference such as model of various transmission facility and controller switching equipment, specification also produces different impacts to the conveying of electric energy.Therefore, in transmission system and distribution system, easily produce the power quality problems such as each harmonic, low-power factor, three-phase current unbalance, when certain one or more power quality problem is serious, will cause power-supply unit or consumer cisco unity malfunction, even can affect the power supply safety of electrical network.How to simulate operational factor and the impact of equipment for power transmission and distribution on the quality of power supply of equipment for power transmission and distribution in electrical power trans mission/distribution system, to the power-supply unit being connected to the grid and secondary detection equipment, the check that networks seems particularly crucial.
Yet, China is the main open-loop test mode that adopts at present, namely adopt unitary variant, other parameter is specified in the situation that, to some performances of transmission facility or the secondary circuit of equipment detects, as, the content of harmonic wave in test macro only, or tri-phase unbalance factor etc. in test macro only, in above-mentioned test, harmonic wave and tri-phase unbalance factor are unitary variants, and other power factor (PF) etc. are all in specified category.Then, in electrical power trans mission/distribution system, the factor such as harmonic wave, 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 electrical power trans mission/distribution system reality, are more difficult to real simulation to the on-the-spot running environment of electrical power trans mission/distribution system.
On the other hand, in the prior art, the various energy-efficient equipments that improve for the electrical power trans mission/distribution system quality of power supply, have and carry out single function compensation, as the content of harmonic wave in system is absorbed, or only the interior tri-phase unbalance factor of test macro compensates etc., also have and carry out multinomial compensation, as what the content of harmonic wave in system and tri-phase unbalance factor are regulated simultaneously, but, existing detection system can only adopt unitary variant, other parameter detects specified in the situation that, or directly use gross data, but be difficult to assess really true the improve effect of energy-efficient equipment to power grid quality.
Summary of the invention
Technical matters to be solved by this invention is for the above-mentioned problems in the prior art, and a kind of energy-saving multifunction power test system for real simulation electrical power trans mission/distribution system power quality parameter and each equipment for power transmission and distribution electric energy loss of on-line monitoring is provided.
For addressing the above problem, technical scheme of the present invention is:
A kind of energy-saving multifunction power test system, described test macro comprises controller, step-up transformer, high pressure impedance simulation device for simulated high-pressure line impedence, step-down transformer, for simulating the low pressure impedance simulation device of low-voltage line impedance, load simulator for fictitious load energy loss, for the first data acquisition unit of electric current on hi-line and voltage sample with for the second data acquisition unit of electric current on low-voltage line and voltage sample, step-up transformer, high pressure impedance simulation, step-down transformer, low pressure impedance simulation device is connected in turn with load simulator, controller respectively with high pressure impedance simulation device, low pressure impedance simulation device, load simulator, the first data acquisition unit is connected with the second data acquisition unit, the first data acquisition unit is connected to the junction of step-up transformer and high pressure impedance simulation device, the second data acquisition unit is connected to the junction of low pressure impedance simulation device and load simulator, the input end of described step-up transformer is connected with three-phase electricity, the output terminal of load simulator is connected with the input end of step-up transformer, described load simulator comprises for generation of the rectification module of electric current and harmonic wave and for the inversion module of electric current and feedback of harmonic, rectification module is connected with inversion module,
Three-phase electricity enters high pressure impedance simulation device after step-up transformer boosts, step-down transformer receives the three-phase electricity of high pressure impedance simulation device output and carries out step-down, three-phase electricity after step-down outputs to rectification in the rectification module of load simulator through low pressure impedance simulation device, three-phase electricity after rectification outputs to inversion module and carries out active inversion, and the three-phase electricity after inversion turns back in step-up transformer.
Wherein, controller receives the first data acquisition unit current and voltage data and processes, controller receive the current and voltage data of the second data acquisition unit collection and process after output in load simulator, load simulator receives the control signal of controller output, and exports corresponding load energy loss.
Be compared to prior art, power quality parameter and various extreme condition in energy-saving multifunction power test system energy real simulation electrical power trans mission/distribution system of the present invention, can each equipment for power transmission and distribution electric energy loss of on-line monitoring in the situation that of various fictitious load, in order to reflect really energy-saving effect and the operating characteristic of each equipment for power transmission and distribution, and under the impact of different transmission facilities, the energy loss degree of electrical network and the economical operation of transformer, be also conducive to low and medium voltage distribution network power quality controlling measure development.
Preferably, 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.
Rectification module can simulate simultaneous active current, reactive current, harmonic current and tri-phase unbalance factor in electrical network, also can simulate the various maximum conditions in electrical network, impact for detection of the various conditions in electrical network on equipment for power transmission and distribution, and the active current, reactive current and the harmonic current that rectification module are produced by inversion module carry out energy recovery, tri-phase unbalance factor is compensated, the access electrical networks such as active current, reactive current and harmonic current have been avoided, energy recovery rate is high, energy-conserving and environment-protective.
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.
Preferably, between described low pressure impedance simulation device and load simulator, be parallel with for improving the energy-conserving product of the quality of power supply, energy-conserving product is connected between the second data acquisition unit and the junction and load simulator of low pressure impedance simulation device, and energy-conserving product is connected with controller.Energy-conserving product is for improving the quality of power supply of electrical network, by native system, can carry out Efficient Evaluation to the energy-saving effect of energy-conserving product, at load simulator, simulate multiple as the situation of active current, reactive current, harmonic current and tri-phase unbalance factor etc., to the one or more power saving functions of energy-conserving product, can carry out Efficient Evaluation simultaneously, simultaneously, load simulator also can simulate the various maximum conditions in electrical network, detect the energy conservation characteristic curve of energy-conserving product, be conducive to the uneven energy-conserving product of the various quality in standard existing market.
Preferably, described energy-conserving product is a kind of in reactive power compensator, three-phase imbalance adjusting gear, harmonic treating apparatus and Power Quality Comprehensive Treatment Device, and Power Quality Comprehensive Treatment Device comprises three kinds or any two kinds in reactive-load compensation dress unit, three-phase imbalance adjustment unit and harmonic wave governance unit.Test macro can detect a plurality of functions of energy-conserving product simultaneously, has greatly improved the accuracy and the reliability that detect data.
Preferably, described test macro also comprises remote controllers, and remote controllers are connected with controller is wired or wireless.
Preferably, described step-up transformer and step-down transformer are the transformer equipment of actual access electrical network.Transformer to reality access electrical network carries out loss characteristic detection, be conducive to understand the real work situation of each transformer, be conducive to the design of electrical network wiring, more improved the degree of transformer economic operation, on the other hand, system can simulate the quality of power supply of electrical network more really.
Preferably, in described controller, be provided with parameter storage unit, in parameter storage unit, preserve for calculating the high voltage parameter of high pressure impedance and for calculating the low pressure parameter of low pressure impedance, high pressure impedance simulation device and low pressure impedance simulation device receive respectively high voltage parameter and the low pressure parameter that controller transmits and export corresponding high pressure impedance and low pressure impedance.
Preferably, described high voltage parameter is hi-line length and hi-line model, and low pressure parameter is low-voltage line length and low-voltage line model.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of energy-saving multifunction power test system of the present invention.
Fig. 2 is the schematic block circuit diagram of load simulator in energy-saving multifunction power test system of the present invention.
Fig. 3 is the circuit diagram of load simulator in energy-saving multifunction power test system of the present invention.
Fig. 4 is that energy-saving multifunction power test system of the present invention is in conjunction with the schematic block circuit diagram of energy-conserving product.
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-saving multifunction power test system of the present invention, comprise controller, step-up transformer, high pressure impedance simulation device for simulated high-pressure line impedence, step-down transformer, for simulating the low pressure impedance simulation device of low-voltage line impedance, load simulator for fictitious load energy loss, for the first data acquisition unit of electric current on hi-line and voltage sample with for the second data acquisition unit of electric current on low-voltage line and voltage sample, step-up transformer, high pressure impedance simulation, step-down transformer, low pressure impedance simulation device is connected in turn with load simulator, controller respectively with high pressure impedance simulation device, low pressure impedance simulation device, load simulator, the first data acquisition unit is connected with the second data acquisition unit, the first data acquisition unit is connected to the junction of step-up transformer and high pressure impedance simulation device, the second data acquisition unit is connected to the junction of low pressure impedance simulation device and load simulator, the input end of described step-up transformer is connected with three-phase electricity, the output terminal of load simulator is connected with the input end of step-up transformer, described load simulator comprises for generation of the rectification module of electric current and harmonic wave and for the inversion module of electric current and feedback of harmonic, rectification module is connected with inversion module.Described test macro also comprises remote controllers, and remote controllers are connected with controller is wired or wireless, for realizing remote on-line monitoring and system setting.
In described controller, be provided with parameter storage unit, in parameter storage unit, preserve for calculating the high voltage parameter of high pressure impedance and for calculating the low pressure parameter of low pressure impedance, high pressure impedance simulation device and low pressure impedance simulation device receive respectively high voltage parameter and the low pressure parameter that controller transmits and export corresponding high pressure impedance and low pressure impedance.Wherein, high voltage parameter is hi-line length and hi-line model, and low pressure parameter is low-voltage line length and low-voltage line model, and high voltage parameter and low pressure parameter are the value that sets in advance or measure, and also can regulate according to the needs of actual transmission & distribution line.
Electric current and the voltage of the first data acquisition unit collection after step-up transformer, controller receives the current and voltage data of the first data acquisition unit and processes, the current and voltage data that controller collects according to the first data acquisition unit calculates the loss value of step-up transformer, real-time data acquisition and calculating, for detection of iron loss, copper loss and the eddy current loss of active power, reactive power, power factor (PF), harmonic wave, tri-phase unbalance factor and the transformer of research step-up transformer, realize the on-line monitoring of step-up transformer energy loss.Electric current and the voltage of the second data acquisition unit collection after step-down transformer and low pressure impedance simulation device, controller receives the current and voltage data of the first data acquisition unit and processes, the current and voltage data that controller collects according to the second data acquisition unit, calculate the loss value of step-down transformer, real-time data acquisition and calculating are for detection of the active power of research step-down transformer, reactive power, power factor (PF), harmonic wave, the iron loss of tri-phase unbalance factor and transformer, copper loss and eddy current loss, realize the on-line monitoring of step-down transformer energy loss.Also can increase more multiple current voltage acquisition unit in the different places of test macro, can calculate more accurately the energy loss of various equipment for power transmission and distribution.Wherein, step-up transformer and step-down transformer are the transformer equipment of actual access electrical network, as step-down transformer can be selected following model 100kVA(DYn11) and 100kVA(YYn0), also can carry out according to the actual needs other selection.
Described controller receive the current and voltage data of the second data acquisition unit collection and process after output in load simulator, load simulator receives the control signal of controller output, after computing by controller inside, export corresponding load energy loss.With reference to Fig. 2, in 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 equipment for power transmission and distribution.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. 2, 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. 2, 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 electronic load the space of temperature controllable and humidity, for the load simulation of different temperatures and humidity situation.Energy-feedback electronic load of the present invention is when work, by controller Real-Time Monitoring power network current, voltage signal, the current and voltage data of the second data acquisition unit collection is processed, and produce control signal in load simulator, 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.Load simulator 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.
When test macro of the present invention is in running order, three-phase electricity is boosted through step-up transformer, and now, on the first data acquisition unit collection hi-line, electric current and voltage detect for the loss characteristic of step-up transformer, three-phase electricity after boosting enters high pressure impedance simulation device, and step-down transformer receives the three-phase electricity of high pressure impedance simulation device output and carries out step-down, and the three-phase electricity after step-down outputs to rectification in the rectification module of load simulator through low pressure impedance simulation device, now the second data acquisition unit collection is through electric current and voltage after step-down transformer and low pressure impedance simulation device, loss characteristic for step-down transformer detects, on the other hand, the electric current of the second data acquisition unit Real-time Collection and voltage are input in controller, controller receives the first data acquisition unit current and voltage data and processes, controller receive the current and voltage data of the second data acquisition unit collection and process after output in load simulator, load simulator receives the control signal of controller output, and export corresponding load energy loss.
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, for detection of the loss characteristic of test macro equipment for power transmission and distribution under different active currents, reactive current and harmonic current.Active current, reactive current and the harmonic current of rectification module output can exert an influence to all equipment for power transmission and distribution in whole test macro, can study under different active currents, reactive current and harmonic current the online loss of equipment for power transmission and distribution.
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.The harmonic current that inversion module 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.
With reference to Fig. 4, utilize energy-saving multifunction power test system of the present invention can also realize energy-saving effect test and appraisal and the performance test thereof to low and medium voltage distribution network energy-conserving product, energy-conserving product is for improving the quality of power supply, energy-conserving product is a kind of in reactive power compensator, three-phase imbalance adjusting gear, harmonic treating apparatus and Power Quality Comprehensive Treatment Device, and Power Quality Comprehensive Treatment Device comprises three kinds or any two kinds in reactive-load compensation dress unit, three-phase imbalance adjustment unit and harmonic wave governance unit.
Energy-conserving product is connected to the grid, parallel-connection energy-saving product between low pressure impedance simulation device and load simulator, energy-conserving product is connected between the second data acquisition unit and the junction and load simulator of low pressure impedance simulation device, and energy-conserving product is connected with controller.Because load simulator of the present invention is under the control of controller, can produce and regulate payload, three-phase load imbalance, harmonic wave, negative phase-sequence, system voltage and power factor etc., therefore, when access energy-conserving product, test macro can be on the simultaneous basis of a plurality of factors, energy-conserving product is carried out to energy-saving effect test and appraisal, and performance test, thereby corresponding inhibition or indemnifying measure are also verified.Also energy-conserving product can be put into the space of independent sealing, control the temperature and humidity in this space, to test energy-conserving product at the energy-saving effect under varying environment simultaneously.
In sum, utilize energy-saving multifunction power test system of the present invention, can be for the performance test of low and medium voltage distribution network power product, the performance test of low and medium voltage distribution network power product, energy-saving effect test and appraisal and the performance test thereof of low and medium voltage distribution network energy-conserving product, the impact research on losses of distribution network such as payload, three-phase load imbalance, harmonic wave, negative phase-sequence, system voltage, power factor, low and medium voltage distribution network Reducing Loss by Technology Means measure development, the measure development of low and medium voltage distribution network power quality controlling and properties of product test; Intelligence microgrid Related product performance test and technical research etc.
In above-mentioned explanation, all special instructions that do not add, all adopt technological means of the prior art.
Claims (10)
1. an energy-saving multifunction power test system, it is characterized in that, described test macro comprises controller, step-up transformer, high pressure impedance simulation device for simulated high-pressure line impedence, step-down transformer, for simulating the low pressure impedance simulation device of low-voltage line impedance, load simulator for fictitious load energy loss, for the first data acquisition unit of electric current on hi-line and voltage sample with for the second data acquisition unit of electric current on low-voltage line and voltage sample, step-up transformer, high pressure impedance simulation, step-down transformer, low pressure impedance simulation device is connected in turn with load simulator, controller respectively with high pressure impedance simulation device, low pressure impedance simulation device, load simulator, the first data acquisition unit is connected with the second data acquisition unit, the first data acquisition unit is connected to the junction of step-up transformer and high pressure impedance simulation device, the second data acquisition unit is connected to the junction of low pressure impedance simulation device and load simulator, the input end of described step-up transformer is connected with three-phase electricity, the output terminal of load simulator is connected with the input end of step-up transformer, described load simulator comprises for generation of the rectification module of electric current and harmonic wave and for the inversion module of electric current and feedback of harmonic, rectification module is connected with inversion module,
Three-phase electricity enters high pressure impedance simulation device after step-up transformer boosts, step-down transformer receives the three-phase electricity of high pressure impedance simulation device output and carries out step-down, three-phase electricity after step-down outputs to rectification in the rectification module of load simulator through low pressure impedance simulation device, three-phase electricity after rectification outputs to inversion module and carries out active inversion, and the three-phase electricity after inversion turns back in step-up transformer.
2. energy-saving multifunction power test system according to claim 1, it is characterized in that, 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.
3. energy-saving multifunction power test system according to claim 2, 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.
4. energy-saving multifunction power test system according to claim 3, 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.
5. according to the energy-saving multifunction power test system described in any one in claim 1-4, it is characterized in that, between described low pressure impedance simulation device and load simulator, be parallel with for improving the energy-conserving product of the quality of power supply, energy-conserving product is connected between the second data acquisition unit and the junction and load simulator of low pressure impedance simulation device, and energy-conserving product is connected with controller.
6. energy-saving multifunction power test system according to claim 5, it is characterized in that, described energy-conserving product is a kind of in reactive power compensator, three-phase imbalance adjusting gear, harmonic treating apparatus and Power Quality Comprehensive Treatment Device, and Power Quality Comprehensive Treatment Device comprises three kinds or any two kinds in reactive-load compensation dress unit, three-phase imbalance adjustment unit and harmonic wave governance unit.
7. energy-saving multifunction power test system according to claim 1, is characterized in that, described test macro also comprises remote controllers, and remote controllers are connected with controller is wired or wireless.
8. energy-saving multifunction power test system according to claim 1, is characterized in that, described step-up transformer and step-down transformer are the transformer equipment of actual access electrical network.
9. energy-saving multifunction power test system according to claim 1, it is characterized in that, in described controller, be provided with parameter storage unit, in parameter storage unit, preserve for calculating the high voltage parameter of high pressure impedance and for calculating the low pressure parameter of low pressure impedance, high pressure impedance simulation device and low pressure impedance simulation device receive respectively high voltage parameter and the low pressure parameter that controller transmits and export corresponding high pressure impedance and low pressure impedance.
10. energy-saving multifunction power test system according to claim 9, is characterized in that, described high voltage parameter is hi-line length and hi-line model, and low pressure parameter is low-voltage line length and low-voltage line model.
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| CN104502738A (en) * | 2014-05-26 | 2015-04-08 | 苏州上电科电气设备有限公司 | Transformer loss detection device |
| 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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