CN206272496U - A kind of energy feedback type power network analog power - Google Patents
A kind of energy feedback type power network analog power Download PDFInfo
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- CN206272496U CN206272496U CN201621339190.0U CN201621339190U CN206272496U CN 206272496 U CN206272496 U CN 206272496U CN 201621339190 U CN201621339190 U CN 201621339190U CN 206272496 U CN206272496 U CN 206272496U
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- 239000003990 capacitor Substances 0.000 claims abstract description 13
- 238000004088 simulation Methods 0.000 claims description 8
- 238000011217 control strategy Methods 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 239000013598 vector Substances 0.000 claims description 4
- 230000005611 electricity Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 125000002619 bicyclic group Chemical group 0.000 description 1
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Abstract
The utility model is related to a kind of energy feedback type power network analog power, including power module and control module, it is characterised in that：Described power module is that power network terminates three-phase Y △ type isolating transformers, the output of three-phase Y △ types isolating transformer is followed by Three-Phase PWM Rectifier through being input into inductance, Three-Phase PWM Rectifier exports DC bus-bar voltage, DC bus-bar voltage as three-phase full-bridge inverter input, three-phase full-bridge inverter output connects the second isolating transformer primary, filter capacitor and the second isolating transformer secondary leakage inductance composition LC low pass filters.The utility model degree of modularity is high, and mode of operation is versatile and flexible, and general safety performance is higher, and circuit is more succinct, reliable.It need loading capability strong, the impact of three times current ratings can be born and continue 2s, workload-adaptability is stronger.
Description
Technical field
The utility model is related to a kind of grid stimulating device, and in particular to a kind of energy feedback type power network analog power.
Background technology
In recent years, the generation of electricity by new energy such as photovoltaic generation, wind-power electricity generation industry development is swift and violent, is the important of power industry development
Direction.To ensure grid-connected reliability service, TRT must is fulfilled for related Grid-connection standards technical requirements.
In TRT running, there is electric voltage frequency fluctuation, Voltage Drop, short time voltage interruption, three-phase in power network
The various unusual conditions such as uneven and voltage distortion, therefore research is under the various unusual conditions being likely to occur, TRT
Service behaviour is very important.Under power network unusual condition, TRT must be up to state standards requirement.And in TRT
In test process, the sporadic unusual condition for relying solely on power network is unable to reach test request, it is therefore desirable to special power network mould
Intend power supply to simulate various power network unusual conditions.
Traditional power network analog power input realizes that AC-DC is converted using rectifier bridge, and input power factor is low, input electricity
Stream distortion is serious, big to electric network pollution, it is often more important that it cannot bear energy recharge, thus TRT is carried out it is grid-connected
During test, it is necessary to high power load energy absorption of arranging in pairs or groups, actual condition both cannot be truly simulated, meaningless energy wave is caused again
Take.
The content of the invention
Regarding to the issue above, the utility model provides a kind of energy feedback type power network analog power, and simulating grid voltage is frequently
The abnormal conditions such as rate fluctuation, Voltage Drop, short time voltage interruption, three-phase imbalance and voltage distortion, for TRT is provided to the greatest extent
Possible real power grid environment, so as to meet product test, research, the requirement of analysis.
To solve the above problems, the technical solution of the utility model is：A kind of energy feedback type power network analog power, including
Power module and control module, described power module terminate three-phase Y- △ type isolating transformers for power network, three-phase Y- △ types every
Three-Phase PWM Rectifier is followed by through being input into inductance from transformer output, Three-Phase PWM Rectifier output DC bus-bar voltage, direct current is female
Line voltage as three-phase full-bridge inverter input, it is primary that three-phase full-bridge inverter output connects the second isolating transformer, second every
Filter capacitor, filter capacitor and the second isolating transformer secondary leakage inductance composition LC low pass filters are connect from transformer secondary output, so that
Export the voltage waveform of setting；Described control module is divided into PWM rectifications control and power network simulation control.
Output of the present utility model can be used as three-phase modular system, can also be made as three independent monophase systems
With also parallel three phase can be used as high-power single-phase system.
The utility model power network analog power is divided into routine according to use occasion and the difference of testing standard, its mode of operation
Pattern, low (zero) voltage ride-through pattern, stair step fashion, step pattern and gradual-change mode；The electricity of exportable standard under normal mode
Net voltage, and can on-line control voltage magnitude and frequency, simulating grid voltage magnitude and frequency shift (FS)；Low (zero) voltage ride-through mould
The programmable patterns such as formula, stair step fashion, step pattern and gradual-change mode can simulating grid Voltage Drop, short interruptions, amplitude dash forward
Become, frequency discontinuity, the unusual condition such as power network distortion.
PWM rectifications control uses the vector control strategy based on grid voltage orientation, on the basis of line voltage, to be input into
Electric current is controlled quentity controlled variable, and controller is using the PI controllers under three-phase dq synchronous rotating frames.Power network simulation control uses voltage
Double-closed-loop control, outer shroud is controlled for voltage effective value PI, and inner ring is controlled for instantaneous voltage P.Wherein voltage effective value outer shroud is adopted
Real effective algorithm is used, i.e., under harmonic mode, voltage effective value still includes harmonic components.Therefore it is bicyclic for low-order harmonic
Control remains to reach precision higher, with the increase of overtone order, control loop gain reduction, equivalent to opened loop control.
The utility model output can be used as three-phase modular system, can also be used as three independent monophase systems,
Parallel three phase can also be used as high-power single-phase system, the degree of modularity is high, and mode of operation is versatile and flexible.And can be with
Input PWM rectification circuits are isolated with power network, and output end is also adopted by isolating transformer and load isolation, and general safety performance is higher.
And PWM rectifications control and power network simulation control are integrated in fpga chip all using Digital Control mode, and circuit is more
Plus it is succinct, it is reliable.It need loading capability strong, the impact of three times current ratings can be born and continue 2s, workload-adaptability is stronger.
Brief description of the drawings
Fig. 1 is the main topology diagram of the utility model；
Fig. 2 is the utility model PWM rectification control strategy figures；
Fig. 3 is the utility model three-phase converter policy map；
Fig. 4 is the inductance inductance value upper limit used by the utility model power network analog power according to figure；
Wherein, 1, Y- △ type isolating transformers, 2, input inductance, 3, Three-Phase PWM Rectifier, 4, three-phase full-bridge inverter,
5th, the second isolating transformer.
Specific embodiment
As shown in figure 1, a kind of energy feedback type power network analog power, including power module and control module, described electricity
Source module is power network termination three-phase Y- △ types isolating transformer 1, and three-phase Y- △ types isolating transformer 1 is exported after being input into inductance 2
Three-Phase PWM Rectifier 3 is connect, DC bus-bar voltage Udc, DC bus-bar voltage Udc are complete as three-phase for the output of Three-Phase PWM Rectifier 3
The input of bridge inverter 4, the output of three-phase full-bridge inverter 4 connects the primary of the second isolating transformer 5, the second level of isolating transformer 5 times
Connect filter capacitor, 5 level leakage inductance composition LC low pass filters of filter capacitor and the second isolating transformer, so as to export the electricity of setting
Corrugating；Described control module is divided into PWM rectifications control and power network simulation control.
Described PWM rectifications control uses the vector control strategy based on grid voltage orientation, on the basis of line voltage,
With input current as controlled quentity controlled variable, controller is using the PI controllers under three-phase dq synchronous rotating frames；Described power network simulation
Control uses voltage double-closed-loop control, outer shroud to be controlled for voltage effective value PI, and inner ring is controlled for instantaneous voltage P.
Wherein, power network is terminated with Y- △ types isolating transformer 1, and the net side of Y- △ types isolating transformer 1 is using star-like (without in
Line) connection, suppress third harmonic voltage, AC uses delta connection, for eliminating triple harmonic current.Y- △ types are isolated
The output of transformer 1 connects input inductance 2, and input inductance 2 belongs to the core devices of PWM rectifications, influences the sound state of input current to refer to
Mark, input power factor and DC bus-bar voltage, it is the key that PWM rectifier 3 can realize four quadrant running, is provided simultaneously with
Boost is boosted, and lifts DC bus-bar voltage, reduces power device current stress, therefore the calculating of the inductance value of input inductance 2 is extremely closed
It is important.Determine input inductance inductance value scope according to following principle：
1st, under stable situation, three-phase PWM rectification circuit voltage on line side E, three-phase PWM rectification circuit AC voltage Vac, three
Phase PWM rectification circuit input current I and three-phase PWM rectification circuit inductive drop VL meet relation as shown in Figure 4, fixed according to cosine
Reason andWhen inductance value is maximum determines the inductance upper limit：
Wherein Udc is DC bus-bar voltage setting value, and w is electrical network angular frequency.
(2) lower limit of inductance depends primarily on current on line side total harmonic distortion index, and power network electromotive force is in zero crossing
When current changing rate it is maximum, can obtain：
Wherein Δ I typically takes 0.5Im, and Udc is DC bus-bar voltage setting value, and fpwm is PWM rectifier switching frequency.
Optimal inductance value is can determine that according to above principle and by repetition test.
The input output of inductance 2 accesses three-phase semibridge system PWM rectifier 3, and adds electrochemical capacitor, for smooth direct current bus
Waveform.Three-phase semibridge system PWM rectifications drive and use SVPWM pulse width modulation modes, greatly improve bus utilization rate, and disappear naturally
Except tertiary current harmonic wave.
DC bus-bar voltage Udc as three-phase full-bridge inverter 4 input, produce High ireguency SPWM waveform, by second every
After transformer 5, filter capacitor is connect, 5 level leakage inductances of filter capacitor and the second isolating transformer constitute LC low passes with filter capacitor
Wave filter, smooth sinusoidal waveform is turned into by the filtering of SPWM waveforms.Because three-phase full-bridge inverter 4 passes through the second isolating transformer
5 are isolated, therefore both can be with outputting standard three-phase waveform, it is also possible to every phase independent control, can also be by parallel three phase
By controlled output high-power single-phase waveform.
Three-Phase PWM Rectifier 3 as shown in Figure 2 is based on electricity using the digital control algorithm realized based on FPGA, the algorithm
Net is voltage oriented, and cutting-in control is realized by the amplitude and phase of control input current phasor.The Grid-connected Control Strategy is based on same
Step rotating coordinate system, dq axles are decomposed to by line voltage E and electric current I, so as to three-phase alternating current controlled quentity controlled variable is changed into two DC quantities
Ed, eq, id, iq, by designing d axles, q axle PI controllers, you can realize zero steady state error control.In this example, by single synchronous seat
Mark system digital phase-locked loop SSPF-SPLL realizes being accurately positioned line voltage E, while input current I is gathered, and according to power network
Voltage E resolutions of vectors are id, iq, and the active power and reactive power of PWM rectifier are can control by controlling id, iq.
Whole PWM rectifier control system is made up of DC bus-bar voltage outer shroud and active, reactive current inner ring.Direct current is female
Line voltage outer shroud uses PI controllers, dc bus is accurately reached setting value, and is to be capable of achieving to straight by the control to id
Flow the regulation of bus.Current inner loop is realized in dq rotating coordinate systems, by id, iq and given value of current value id_ref, iq_ of sampling
Ref compares, and is controlled by P controller, finally realizes the cutting-in control of PWM rectifier.
Wherein, the parameter declaration in Fig. 2：Kip：PWM rectification circuit digitial controller current inner loop proportion adjustment gains；τ
i：PWM rectification circuit digitial controller current inner loop integral adjustment integral coefficients；Ts：PWM rectification circuit digitial controller electric currents
Inner ring time constant；Ku：PWM rectification circuit digitial controller busbar voltage outer shroud proportion adjustment gains；τu：PWM rectification circuits
Digitial controller busbar voltage outer shroud integral adjustment integral coefficient；Tu：During PWM rectification circuit digitial controller busbar voltage outer shrouds
Between constant；Kpwm：Three-phase PWM rectification circuit equivalent gain；R:Three-phase PWM rectification circuit equiva lent impedance；L：Three-phase PWM rectified current
Road network side filter inductance；C：Three-phase PWM rectification circuit DC bus capacitor.
Reference picture 3, three-phase full-bridge inverter 4 is had using three independent controllers, each controller using output voltage
Valid value outer shroud, the control strategy of output voltage instantaneous value inner ring, each controller is uniformly controlled by FPGA, according to different work
Pattern, exports different voltage set-points.Output voltage virtual value outer shroud uses PI controllers, realizes to output voltage amplitude
Zero steady state error control, output voltage instantaneous value inner ring uses P controller, improves response speed, realizes the instantaneous control to output waveform
System.
Three-phase full-bridge inverter 4 will realize power network analog functuion, comprising three-phase equilibrium, three-phase imbalance, voltage distortion etc.
Normal and unusual condition.Due to using three independent controllers, therefore can easily realize the independent control to three-phase.And it is right
It is by being realized to given voltage superposition 2-40 subharmonic in the simulation of voltage distortion situation.For harmonic operation pattern, by
Larger in power, switching frequency is typically within 10kHz, and LC cut-off frequencies are general in 1000Hz or so, therefore for humorous
Ripple is unable to reach precise control.Conventional treatment mode is fundamental wave closed-loop control plus harmonic wave opened loop control.To controlling party in this example
Formula is improved, and fundamental wave and harmonic wave share a controller, and virtual value outer shroud still ensures that the real effective control of harmonic voltage
System, and instantaneous voltage inner ring is controlled to the harmonic voltage waveform for exporting, for 2-10 subharmonic, closed loop controller gain
Higher, output remains to reach control accuracy higher, and for 10-40 subharmonic, with the reduction of closed loop gain, control accuracy
Worse and worse, for but compared to traditional control method, the precision of harmonic mode there has been larger raising, and for power network mould
Intend, the situation of low-order harmonic distortion is more universal, therefore this example harmonic mode control mode still has preferable practical significance.
Wherein, the parameter declaration of Fig. 3：r:Three-phase inverter equivalent output impedance；L：Three-phase inverter output inductor；
C：Three-phase inverter output filter capacitor；RMS:Voltage effective value computing module.
Claims (2)
1. a kind of energy feedback type power network analog power, including power module and control module, it is characterised in that：Described power supply
Module is that power network terminates three-phase Y- △ type isolating transformers, and the output of three-phase Y- △ types isolating transformer is followed by three-phase through being input into inductance
PWM rectifier, Three-Phase PWM Rectifier output DC bus-bar voltage, DC bus-bar voltage as three-phase full-bridge inverter input,
Three-phase full-bridge inverter output connects the second isolating transformer primary, and the second isolating transformer secondary connects filter capacitor, filter capacitor
LC low pass filters are constituted with the second isolating transformer secondary leakage inductance, so as to export the voltage waveform of setting；Described control mould
Block is divided into PWM rectifications control and power network simulation control.
2. a kind of energy feedback type power network analog power according to claim 1, it is characterised in that：Described PWM rectifications
Control on the basis of line voltage, with input current as controlled quentity controlled variable, is controlled using the vector control strategy based on grid voltage orientation
Device processed is using the PI controllers under three-phase dq synchronous rotating frames；Described power network simulation control uses voltage two close cycles control
System, outer shroud is controlled for voltage effective value PI, and inner ring is controlled for instantaneous voltage P.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107546968A (en) * | 2017-10-10 | 2018-01-05 | 北京东标电子有限公司 | A kind of railway supply harmonic administers voltage-stabilizing system |
| CN108363030A (en) * | 2018-05-18 | 2018-08-03 | 福州大学 | A kind of portable three-phase voltage current calibration instrument and its control method |
| CN110571841A (en) * | 2019-07-10 | 2019-12-13 | 台州宏达电力建设有限公司台州经济开发区运检分公司 | Variable frequency power transmission system |
| CN111308347A (en) * | 2020-04-16 | 2020-06-19 | 西南科技大学 | Generator testing system and method |
| CN111983501A (en) * | 2020-08-26 | 2020-11-24 | 广东电网有限责任公司电力科学研究院 | Modular energy feedback type AC/DC virtual load |
| CN112290814A (en) * | 2019-07-24 | 2021-01-29 | 苏州万瑞达电气有限公司 | Three-phase PWM rectifier control method using isolation transformer for grid connection |
| CN114243765A (en) * | 2021-12-03 | 2022-03-25 | 合肥科威尔电源系统股份有限公司 | Parallel operation control method, device and equipment for power grid analog power supply and storage medium |
| CN114244172A (en) * | 2021-12-03 | 2022-03-25 | 合肥科威尔电源系统股份有限公司 | Power grid simulation power supply and use method thereof |
| CN117110771A (en) * | 2023-10-23 | 2023-11-24 | 山东博纳电气有限公司 | Feedback type power grid simulator and working method thereof |
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2016
- 2016-12-07 CN CN201621339190.0U patent/CN206272496U/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107546968A (en) * | 2017-10-10 | 2018-01-05 | 北京东标电子有限公司 | A kind of railway supply harmonic administers voltage-stabilizing system |
| CN108363030A (en) * | 2018-05-18 | 2018-08-03 | 福州大学 | A kind of portable three-phase voltage current calibration instrument and its control method |
| CN110571841A (en) * | 2019-07-10 | 2019-12-13 | 台州宏达电力建设有限公司台州经济开发区运检分公司 | Variable frequency power transmission system |
| CN112290814A (en) * | 2019-07-24 | 2021-01-29 | 苏州万瑞达电气有限公司 | Three-phase PWM rectifier control method using isolation transformer for grid connection |
| CN112290814B (en) * | 2019-07-24 | 2024-04-26 | 苏州弗赛新能源科技有限公司 | Three-phase PWM rectifier control method using isolation transformer for grid connection |
| CN111308347A (en) * | 2020-04-16 | 2020-06-19 | 西南科技大学 | Generator testing system and method |
| CN111308347B (en) * | 2020-04-16 | 2022-05-31 | 西南科技大学 | Generator testing system and method |
| CN111983501A (en) * | 2020-08-26 | 2020-11-24 | 广东电网有限责任公司电力科学研究院 | Modular energy feedback type AC/DC virtual load |
| CN114243765A (en) * | 2021-12-03 | 2022-03-25 | 合肥科威尔电源系统股份有限公司 | Parallel operation control method, device and equipment for power grid analog power supply and storage medium |
| CN114244172A (en) * | 2021-12-03 | 2022-03-25 | 合肥科威尔电源系统股份有限公司 | Power grid simulation power supply and use method thereof |
| CN114244172B (en) * | 2021-12-03 | 2023-06-20 | 科威尔技术股份有限公司 | Power grid analog power supply |
| CN117110771A (en) * | 2023-10-23 | 2023-11-24 | 山东博纳电气有限公司 | Feedback type power grid simulator and working method thereof |
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Effective date of registration: 20231025 Address after: Room 302, No. 1069, Gangxing 3rd Road, Export Processing Zone, High-tech Zone, Jinan, Shandong Province, 250000 Patentee after: Shandong Ainuo Intelligent Instrument Co.,Ltd. Address before: No. 1069 Gangxing Third Road, Export Processing Zone, High tech Zone, Jinan City, Shandong Province, 250104 Patentee before: SHANDONG AINUO INSTRUMENT Co.,Ltd. |