CN105388378A - Voltage support experiment testing platform and method with super-capacitor-based dynamic voltage restorer - Google Patents
Voltage support experiment testing platform and method with super-capacitor-based dynamic voltage restorer Download PDFInfo
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- CN105388378A CN105388378A CN201510756595.8A CN201510756595A CN105388378A CN 105388378 A CN105388378 A CN 105388378A CN 201510756595 A CN201510756595 A CN 201510756595A CN 105388378 A CN105388378 A CN 105388378A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
Abstract
The invention, which belongs to the technical field of the voltage support of the power grid, provides a voltage support experiment testing platform and method with a super-capacitor-based dynamic voltage restorer. In order to solve a problem of lack of accurate theoretical data of the super-capacitor-based dynamic voltage restorer in practical application, the testing platform comprises a programmable grid fault simulator, a programmable load and, and a super-capacitor-based dynamic voltage restorer. The programmable grid fault simulator is used for simulating a voltage drop of a simulated grid and inputting a working voltage for a programmable load; the super-capacitor-based dynamic voltage restorer is used for collecting the voltage outputted by the programmable grid fault simulator, determining a drop situation according to the voltage, and carrying out compensation on the working voltage of the programmable load based on the drop; and the programmable load is used for setting loads with different low-voltage protection threshold values. According to the invention, the provided testing platform is used for providing data for scientific researches. And according to the testing method, the testing platform is realized by using software programs to carry out a simulated experiment.
Description
Technical field
The invention belongs to line voltage support technology field, relate to a kind of dynamic electric voltage recovery device voltage support experiment test platform based on super capacitor and method.
Background technology
Along with being showing improvement or progress day by day of science and technology, more user have employed that performance is good, efficiency is high but high technology equipment to power supply characteristic sensitive, as: robot, medical first aid mechanism, automatic production line, precise numerical control machine, high precision measuring instrument, computer information management system etc.These using electricity systems and consumer very responsive for the various interference of electrical network.The power quality problem caused due to any reason all may cause great economic loss and bad social influence.The i.e. voltage dip the most frequently causing result the most serious is there is in power quality problem.The reason of voltage dip is caused to have a lot, as thunder and lightning, line fault, high power load start and stop etc.Voltage dip refers to the event that supply voltage root-mean-square value declined suddenly in the short time.Voltage dip Typical duration is 0.5 ~ 30 cycle.International Electrotechnical Commission (IEC) is defined as drops to 90% ~ 1% of ratings; Institute of Electrical and Electronic Engineers (IEEE) is defined as drops to 90% ~ 10% of ratings.In the analysis of voltage dip, usually the ratio of voltage effective value when falling temporarily and rated voltage effective value is defined as the amplitude of falling temporarily.May correspond to different temporary range of decrease values in actual measurement instrument and provide the corresponding duration, be defined as the duration corresponding with specific temporary range of decrease value by voltage dip root-mean-square value lower than a period of time of formulating voltage threshold.
In addition, voltage dip is attended by the flip-flop of voltage-phase toward contact, is referred to as phase hit.There is phase hit in voltage, be different due to system and the reactance of circuit and the ratio of resistance, or imbalance is fallen temporarily and caused to low-pressure system transmission.The amplitude of voltage dip, duration and phase hit are nominally most important three characteristic quantities of voltage dip.
Due to electrical network may occur that voltage magnitude falls, electric voltage frequency skew, the various malfunction such as imbalance of three-phase voltage and harmonic voltage distortion, therefore in the process of the research of voltage support, consider electrical network these malfunctions that may occur and Study system nonserviceable under serviceability be very important.
Dynamic electric voltage recovery device great majority on market are import equipments, selling at exorbitant prices, and function is limited to.So in recent years, institution of higher learning, research institution, R&D organization etc. all started the development carrying out dynamic electric voltage recovery device.
In laboratory study process, the voltage that electrical network provides is the standard sine voltage of low harmony wave, and electric network fault has contingency and uncontrollability, when research and the system testing of distributed power generation, cannot simulate various malfunction by means of only electrical network itself.Therefore, the failure condition being carried out simulating grid by some special equipment is needed.
Existing fault simulator has a variety of.Such as: the voltage failure simulator realized based on impedance manner, be realize Voltage Drop by parallel in main circuit or resistance in series/reactance; Based on the voltage failure simulator of transformer, be realize falling of line voltage by the no-load voltage ratio of transformer; Based on the voltage failure simulator of Technics of Power Electronic Conversion, utilize alternating electromotive force control circuit, ac/ac frequency converter and hand over orthogonal transducer etc. to realize falling of voltage.But this analogue means function is relatively single, cannot simulate various electric network fault, the test request of distributed generation system therefore can not be met completely.
Summary of the invention
The dynamic electric voltage recovery device that the object of the invention is to solve existing super capacitor lacks the problem of gross data accurately in actual applications, the invention provides a kind of dynamic electric voltage recovery device voltage support experiment test platform based on super capacitor and method.
A kind of dynamic electric voltage recovery device voltage support experiment test platform based on super capacitor of the present invention, described test platform comprises electric network fault simulator able to programme, programmable load and the dynamic electric voltage recovery device based on super capacitor;
Electric network fault simulator able to programme, for the Voltage Drop of simulating grid, is programmable load input service voltage;
Based on the dynamic electric voltage recovery device of super capacitor, for gathering the voltage that electric network fault simulator able to programme exports, judging to fall according to described voltage, and compensating according to the operating voltage fallen programmable load;
Programmable load, can arrange the load of different low-voltage variation threshold value.
The described dynamic electric voltage recovery device based on super capacitor comprises rectifier, Support Capacitor, inverter, super capacitor, DC-DC converter and the first controller;
The three-phase alternating voltage that electrical network exports exports direct current after rectifier, and described direct current output AC electricity after inverter to afford redress power supply for programmable load;
Support Capacitor in parallel on rectifier DC bus;
Rectifier DC bus is also mounted with DC-DC converter, and direct current injects super capacitor energy storage through DC-DC converter, and the electric energy stored in super capacitor feeds back in rectifier DC bus by DC-DC converter;
Controller, for gathering the voltage that electric network fault simulator able to programme exports, judging the degree fallen, controlling the duty of DC-DC converter according to described voltage:
The voltage exported when electric network fault simulator able to programme belongs to and slightly falls, and control DC-DC converter and do not work, Support Capacitor output voltage is compensated by the operating voltage of inverter to programmable load;
The voltage exported when electric network fault simulator able to programme belongs to severe and falls, control DC-DC converter works, the electric energy stored in super capacitor feeds back in rectifier DC bus by DC-DC converter, and compensated by the operating voltage of inverter to programmable load;
When super capacitor voltage by put a little fall to quota two/for the moment, control DC-DC converter quit work;
When the electric energy of super capacitor is discontented and line voltage is normal, controls DC-DC converter work, super capacitor is charged, until be full of.
Electric network fault simulator able to programme comprises PWM rectifier, three single-phase full bridge inverter circuits and second controller; The three-phase alternating voltage that electrical network exports is by PWM rectifier rectification, and three single-phase full bridge inverter circuits are arranged in parallel; The electrode input end of each single-phase full bridge inverter circuit is all connected with the cathode power supply output terminal of PWM rectifier, the negative input of each single-phase full bridge inverter circuit is all connected with the negative power supply output terminal of PWM rectifier, an ac output end of three single-phase full bridge inverter circuits links together, and ground connection; Another ac output end of three single-phase full bridge inverter circuits exports respectively, and forming three-phase alternating voltage is that programmable load is powered;
Second controller, for controlling the on off state of PWM rectifier and three single-phase full bridge inverter circuits, and then the amplitude fallen of control voltage and duration.
The described dynamic electric voltage recovery device based on super capacitor also comprises boosting filtering system, and the voltage that inverter exports, after boosting filtering system, compensates the operating voltage of programmable load.
Based on the dynamic electric voltage recovery device voltage support experimental test procedures of super capacitor, described method of testing comprises the steps:
For the Voltage Drop of simulating grid, it is the step of load input service voltage;
For gathering the input service voltage of load, judge to fall according to described voltage, and according to falling the step compensated the operating voltage of load;
The step of load low-voltage variation threshold value is set.
Beneficial effect of the present invention is, experiment porch is by adding electric network fault simulator able to programme and special load, according to collection in worksite and test data, real site environment, electric network fault, consumer state are simulated, produce close to real voltage flickering fault condition.
The present invention, under possessing electrical network flashing and becoming the prerequisite of fault simulation, by adding based on the dynamic electric voltage recovery device of super capacitor, completes voltage support experiment, thus provides accurate gross data and technological accumulation for the rig-site utilization of super capacitor dynamic electric voltage recovery device.This experiment test platform is used for scientific research, large-scale voltage compensation project's earlier stage demonstration, beforehand research research and development etc.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the dynamic electric voltage recovery device voltage support experiment test platform based on super capacitor described in embodiment one.
Fig. 2 is the electrical connection schematic diagram of the dynamic electric voltage recovery device voltage support experiment test platform based on super capacitor described in embodiment one.
Embodiment
Embodiment one: composition graphs 1 and Fig. 2 illustrate present embodiment, the dynamic electric voltage recovery device voltage support experiment test platform based on super capacitor described in present embodiment,
Described test platform comprises electric network fault simulator able to programme, programmable load and the dynamic electric voltage recovery device based on super capacitor;
Electric network fault simulator able to programme, for the Voltage Drop of simulating grid, is programmable load input service voltage;
In actual applications, be easy to by thunder and lightning, line fault etc. the situation causing grid voltage sags;
Based on the dynamic electric voltage recovery device of super capacitor, for gathering the voltage that electric network fault simulator able to programme exports, judging to fall according to described voltage, and compensating according to the operating voltage fallen programmable load;
Programmable load, can arrange the load of different low-voltage variation threshold value.
Electric network fault simulator able to programme comprises PWM rectifier, three single-phase full bridge inverter circuits and second controller; The three-phase alternating voltage that electrical network exports is by PWM rectifier rectification, and three single-phase full bridge inverter circuits are arranged in parallel; The electrode input end of each single-phase full bridge inverter circuit is all connected with the cathode power supply output terminal of PWM rectifier, the negative input of each single-phase full bridge inverter circuit is all connected with the negative power supply output terminal of PWM rectifier, an ac output end of three single-phase full bridge inverter circuits links together, and ground connection; Another ac output end of three single-phase full bridge inverter circuits exports respectively, and forming three-phase alternating voltage is that programmable load is powered;
Second controller, for controlling the on off state of PWM rectifier and three single-phase full bridge inverter circuits, and then the amplitude fallen of control voltage and duration;
The topological structure of present embodiment can control three-phase voltage amplitude and phase angle respectively, can simulate three-phase voltage and to fall and single-phase voltage falls, voltage phase angle saltus step etc., simultaneously can by the amplitude of programming Control Voltage Drop and duration.Voltage Drop amplitude is by 0% ~ 100%, and the duration is by 10ms ~ 2s;
In order to simulate required electric network fault, voltage control instructions U must be sent by second controller
a, U
b, U
c,under desirable grid conditions, three-phase voltage is sinusoidal, symmetrical, and its voltage instruction is
In formula: A
just, B
just, C
justfor the amplitude of fundamental positive sequence, ω electrical network angular frequency;
Like this, each phase voltage amplitude in software programming change formula is in real time taked can to produce three-phase voltage symmetry, asymmetricly to fall or pump rises fault.In like manner carry out given A by the vector table change of specifying
just, B
just, C
just, get final product the fluctuation of simulating grid voltage; Changing angular frequency instruction in real time then can the drift phenomenon of simulating grid frequency.
Integration θ=∫ ω dt is carried out to electrical network angular frequency in formula simultaneously, voltage phase angle θ can be obtained.Obtained phasing degree is added to the undesired signal Δ θ of a certain size and change direction, can the various saltus steps at analogue phase angle.
Electric network fault simulator able to programme in present embodiment is made up of three single-phase subsystems, and three single-phase subsystems can run respectively as monophase system, realizes synchronously getting final product simulating grid, flexible working mode, be easy to modularization between three-phase by communication.
The described dynamic electric voltage recovery device based on super capacitor comprises rectifier, Support Capacitor, inverter, super capacitor, DC-DC converter and the first controller;
The three-phase alternating voltage that electrical network exports exports direct current after rectifier, and described direct current output AC electricity after inverter to afford redress power supply for programmable load;
Support Capacitor in parallel on rectifier DC bus;
Rectifier DC bus is also mounted with DC-DC converter, and direct current injects super capacitor energy storage through DC-DC converter, and the electric energy stored in super capacitor feeds back in rectifier DC bus by DC-DC converter; ;
Controller, for gathering the voltage that electric network fault simulator able to programme exports, judging the degree fallen, controlling the duty of DC-DC converter according to described voltage:
The voltage exported when electric network fault simulator able to programme belongs to and slightly falls, slightly fall when drop-off voltage amplitude belongs to lower than 1/2 of rated voltage amplitude, control DC-DC converter not work, Support Capacitor output voltage is compensated by the operating voltage of inverter to programmable load; Well known in the art for the judgement slightly fallen or severe is fallen;
The voltage exported when electric network fault simulator able to programme belongs to severe and falls, belong to severe fall when drop-off voltage amplitude exceedes 3/4 of rated voltage amplitude, the electric energy stored in super capacitor is fed back in rectifier DC bus by DC-DC converter, and is compensated by the operating voltage of inverter to programmable load;
When super capacitor voltage by put a little fall to quota two/for the moment, control DC-DC converter quit work;
When the electric energy of super capacitor is discontented and line voltage is normal, controls DC-DC converter work, super capacitor is charged, until be full of.
Be energy storage device based on the dynamic state voltage resume device of super capacitor with super capacitor, instantaneous three-phase voltage can be supported and fall, also can fall for single-phase voltage and compensate.Present embodiment possess current protection based on super capacitor dynamic electric voltage recovery device, voltage protection, the safeguard measures such as overheat protector simultaneously.
The described dynamic electric voltage recovery device based on super capacitor also comprises boosting filtering system, and the voltage that inverter exports, after boosting filtering system, compensates the operating voltage of programmable load.
The programmable load of present embodiment, by simulation actual field consumer load condition.Make experiment porch experiment condition more actualization.By software control load inverter low-voltage variation threshold value, the voltage that low-voltage variation is carried out in load can be set.Simultaneously can by the change of CAN Real-Time Monitoring load side voltage, sampled data can record preservation.Load simultaneously can need to carry out being replaced by motor lifting loads according to different experiments, the load of running up property of motor, impact load etc.
The experiment effect of present embodiment:
1, simulate the single-phase voltage caused due to circuit single-phase short circuit to fall.Dynamic electric voltage recovery device based on super capacitor carries out single-phase voltage support.It is 5% ~ 30% that single-phase voltage falls amplitude, and drop-out time is 50ms ~ 1s.
2, the three-phase voltage that causes due to three-phase instantaneous voltage sag that the factors such as thunder and lightning cause of electric network fault simulator able to programme simulation is instantaneous falls.Now dynamic electric voltage recovery device can carry out the support of voltage three-phase.Experimental design: it is 5% ~ 30% that three-phase voltage falls amplitude, drop-out time is 50ms ~ 1s.
3, electric network fault simulator able to programme falls due to the line fault voltage transient degree of depth, and place needs to be switched to extension wire.Now dynamic electric voltage recovery device carries out voltage three support.Experimental design: it is 50% ~ 100% that three-phase voltage falls, and drop-out time is 100ms ~ 5s.
Embodiment two: the dynamic electric voltage recovery device voltage support experimental test procedures based on super capacitor described in present embodiment, described method comprises the steps:
For the Voltage Drop of simulating grid, it is the step of load input service voltage;
For gathering the input service voltage of load, judge to fall according to described voltage, and according to falling the step compensated the operating voltage of load;
The step of load low-voltage variation threshold value is set.
Claims (5)
1., based on a dynamic electric voltage recovery device voltage support experiment test platform for super capacitor, it is characterized in that, described test platform comprises electric network fault simulator able to programme, programmable load and the dynamic electric voltage recovery device based on super capacitor;
Electric network fault simulator able to programme, for the Voltage Drop of simulating grid, is programmable load input service voltage;
Based on the dynamic electric voltage recovery device of super capacitor, for gathering the voltage that electric network fault simulator able to programme exports, judging to fall according to described voltage, and compensating according to the operating voltage fallen programmable load;
Programmable load, can arrange the load of different low-voltage variation threshold value.
2. the dynamic electric voltage recovery device voltage support experiment test platform based on super capacitor according to claim 1 and 2, it is characterized in that, the described dynamic electric voltage recovery device based on super capacitor comprises rectifier, Support Capacitor, inverter, super capacitor, DC-DC converter and the first controller;
The three-phase alternating voltage that electrical network exports exports direct current after rectifier, and described direct current output AC electricity after inverter to afford redress power supply for programmable load;
Support Capacitor in parallel on rectifier DC bus;
Rectifier DC bus is also mounted with DC-DC converter, and direct current injects super capacitor energy storage through DC-DC converter, and the electric energy stored in super capacitor feeds back in rectifier DC bus by DC-DC converter;
Controller, for gathering the voltage that electric network fault simulator able to programme exports, judging the degree fallen, controlling the duty of DC-DC converter according to described voltage:
The voltage exported when electric network fault simulator able to programme belongs to and slightly falls, and control DC-DC converter and do not work, Support Capacitor output voltage is compensated by the operating voltage of inverter to programmable load;
The voltage exported when electric network fault simulator able to programme belongs to severe and falls, control DC-DC converter works, the electric energy stored in super capacitor is fed back in rectifier DC bus by DC-DC converter, and is compensated by the operating voltage of inverter to programmable load;
When super capacitor voltage by put a little fall to quota two/for the moment, control DC-DC converter quit work;
When the electric energy of super capacitor is discontented and line voltage is normal, controls DC-DC converter work, super capacitor is charged, until be full of.
3. the dynamic electric voltage recovery device voltage support experiment test platform based on super capacitor according to claim 1, it is characterized in that, electric network fault simulator able to programme comprises PWM rectifier, three single-phase full bridge inverter circuits and second controller; The three-phase alternating voltage that electrical network exports is by PWM rectifier rectification, and three single-phase full bridge inverter circuits are arranged in parallel; The electrode input end of each single-phase full bridge inverter circuit is all connected with the cathode power supply output terminal of PWM rectifier, the negative input of each single-phase full bridge inverter circuit is all connected with the negative power supply output terminal of PWM rectifier, an ac output end of three single-phase full bridge inverter circuits links together, and ground connection; Another ac output end of three single-phase full bridge inverter circuits exports respectively, and forming three-phase alternating voltage is that programmable load is powered;
Second controller, for controlling the on off state of PWM rectifier and three single-phase full bridge inverter circuits, and then the amplitude fallen of control voltage and duration.
4. the dynamic electric voltage recovery device voltage support experiment test platform based on super capacitor according to claim 3, it is characterized in that, the described dynamic electric voltage recovery device based on super capacitor also comprises boosting filtering system, the voltage that inverter exports, after boosting filtering system, compensates the operating voltage of programmable load.
5., based on a dynamic electric voltage recovery device voltage support experimental test procedures for super capacitor, it is characterized in that, described method of testing comprises the steps:
For the Voltage Drop of simulating grid, it is the step of load input service voltage;
For gathering the input service voltage of load, judge to fall according to described voltage, and according to falling the step compensated the operating voltage of load;
The step of load low-voltage variation threshold value is set.
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| CN109889074A (en) * | 2019-04-11 | 2019-06-14 | 美的集团武汉制冷设备有限公司 | Drive control circuit and household appliance |
| CN110198051A (en) * | 2019-07-02 | 2019-09-03 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | A kind of aircraft electrical power system high voltage direct current nonlinear load simulator |
| CN111551798A (en) * | 2020-03-20 | 2020-08-18 | 西安交通大学 | Low-voltage energy storage type high-power short circuit testing device and testing method |
| CN112379300A (en) * | 2020-11-30 | 2021-02-19 | 国网冀北电力有限公司电力科学研究院 | Full-power operation test system, method and control method for power electronic transformer |
| CN112600215A (en) * | 2020-12-16 | 2021-04-02 | 深圳供电局有限公司 | System and method for adjusting power quality |
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| CN108919016A (en) * | 2018-09-13 | 2018-11-30 | 广东电网有限责任公司 | A kind of voltage dip generator and voltage dip pilot system |
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| CN111551798A (en) * | 2020-03-20 | 2020-08-18 | 西安交通大学 | Low-voltage energy storage type high-power short circuit testing device and testing method |
| CN112379300A (en) * | 2020-11-30 | 2021-02-19 | 国网冀北电力有限公司电力科学研究院 | Full-power operation test system, method and control method for power electronic transformer |
| CN112600215A (en) * | 2020-12-16 | 2021-04-02 | 深圳供电局有限公司 | System and method for adjusting power quality |
| CN112600215B (en) * | 2020-12-16 | 2024-01-02 | 深圳供电局有限公司 | System and method for adjusting power quality |
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