CN102843085A - Double-feed fan excitation control device and control method thereof - Google Patents
Double-feed fan excitation control device and control method thereof Download PDFInfo
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- CN102843085A CN102843085A CN2012103656865A CN201210365686A CN102843085A CN 102843085 A CN102843085 A CN 102843085A CN 2012103656865 A CN2012103656865 A CN 2012103656865A CN 201210365686 A CN201210365686 A CN 201210365686A CN 102843085 A CN102843085 A CN 102843085A
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Abstract
The invention relates to a control device and a control method thereof, in particular to a double-feed fan excitation control device and a control method thereof. The double-feed fan excitation control device is characterized by comprising a wind power characteristic simulation device, and an AC excitation power generation device and a DSP (Digital Signal Processor) control device which are respectively connected with the wind power characteristic simulation device, an excitation potential device is also connected to the DSP control device, and the excitation potential device is connected with the AC excitation power generation device through an excitation conversion switch. Therefore, the double-feed fan excitation control device and the control method thereof disclosed by the invention have the advantages of reasonable design, simple design, complete practicability and capacities of being used for simulating a wind power generation system of a speed-variable constant-frequency AC excitation double-feed power generator and being used for teaching and scientific research.
Description
Technical field
The present invention relates to a kind of control device and control method thereof, especially relate to a kind of double-fed blower fan excitation controlling device and control method thereof.
Background technology
Wind-powered electricity generation is as a kind of important renewable energy, and is significant to alleviating world energy sources crisis and ecological deterioration.Current, a large amount of human and material resources and financial resources have all been dropped in countries in the world, actively develop the research to wind power technology.The wind power generation simulation experiment system that adopts analogue technique to build in the laboratory; Can realize simulation to wind energy turbine set, wind energy conversion system and wind-driven generator and control system thereof; Research for wind power technology; Especially pass through control technology, maximum wind power tracer technique, suppress the researchs such as energy storage and control technology thereof of wind power fluctuation for wind-driven generator and control technology thereof, interconnection technology, low-voltage; Very convenient research platform is provided, yet research and teaching also is not used in the wind generator system of the AC excitation double-fed wind-driven generator of simulation variable speed constant frequency now.
Summary of the invention
The present invention solves the existing in prior technology technical problem; A kind of wind generator system that is used to simulate the AC excitation double-fed wind-driven generator of variable speed constant frequency is provided, a kind of double-fed blower fan excitation controlling device and the control method thereof that supply teaching and scientific research to use.
Above-mentioned technical problem of the present invention mainly is able to solve through following technical proposals:
A kind of double-fed blower fan excitation controlling device; It is characterized in that; Comprise wind characteristic analogue means, the ac excitation generating device that links to each other with the wind characteristic analogue means respectively and DSP control device; Described DSP control device also is connected with an excitation potential device, and described excitation potential device links to each other with said ac excitation generating device through an excitation change over switch.
Wire-wound asynchronous motor: rotor is a winding-type; Usually adopt the AC excitation mode; Realize the variable speed constant frequency operation through the frequency that changes the AC excitation electric current, its speed adjustable range is same leg speed ± 30%, compares with squirrel cage motor to be greatly improved; Therefore can realize the optimum efficiency operation below the rated wind speed than the good utilisation wind energy; Back-to-back pair of SPWM converter of rotor-exciting converter using; Can two-way transmission slip power, so the maximum working capacity of converter is exactly maximum slip capacity, i.e. 30% capacity motor; Compare with stator side total power converter capacity; The converter capacity is less relatively, and volume is little, and is in light weight.Characteristics such as AC excitation double-fed wind generator system has high efficiency, and big capacity, converter capacity are less have obtained being widely used in actual wind generator system.
At above-mentioned a kind of double-fed blower fan excitation controlling device, described ac excitation generating device comprises a separate excitation DC generator and the ac excited generator that links to each other with said wind characteristic analogue means through the separate excitation DC generator.
At above-mentioned a kind of double-fed blower fan excitation controlling device, said DSP control device comprises a rotor-side dsp controller and the grid side dsp controller that links to each other with ac excited generator through said rotor-side dsp controller while and above-mentioned separate excitation DC generator.
At above-mentioned a kind of double-fed blower fan excitation controlling device, described excitation potential device comprises a flat ripple reactance and the excitation transformer that links to each other with above-mentioned grid side dsp controller through flat ripple reactance.
At above-mentioned a kind of double-fed blower fan excitation controlling device, this double-fed blower fan excitation controlling device also comprises the switch that is incorporated into the power networks that a main transformer and an end link to each other with above-mentioned ac excited generator through main transformer, and the said switch other end that is incorporated into the power networks is connected with electrical network.
At above-mentioned a kind of double-fed blower fan excitation controlling device, above-mentioned excitation change over switch is connected with above-mentioned ac excited generator, excitation transformer and civil power respectively.
A kind of control method that adopts double-fed blower fan excitation controlling device is characterized in that, may further comprise the steps:
Step 1, in inactive state, the power supply of dc bus has single-phase rectification bridge to provide, and the operator sends the grid side start-up command, control device can be adjusted to set point with DC bus-bar voltage automatically if it encourages the mode grid side.What grid side control device and rotor-side control device adopted is sinusoidal pulse width modulation.If from the shunt excitation mode, the grid side control device can not adjusted voltage, and the power supply of dc bus is still provided by the single-phase rectification bridge in the cabinet.
Step 2; The operator could send the excitation instruction to the rotor-side control device after step 2 is carried out; And the rotor-side control device can be kept watch on the rotating speed of unit automatically, has only when generating unit speed surpasses synchronous speed 70% and just can automatic excitation build pressure (acquiescence excitation rotating speed is 80% synchronous speed).The function of rotor-side control device is to follow the tracks of rotor speed to make the output voltage frequency of rotor-side frequency converter be the difference of synchronizing frequency and rotating speed, thus the realization asynchronous generating.This moment, in fact the control of grid side and rotor-side formed an ac-dc-ac frequency converter.If from the shunt excitation mode; In just building 3 ~ 5 seconds of pressure, dc bus power is still provided by single-phase rectification bridge, after set end voltage reaches rated value; The grid side control device can be adjusted to set point with DC bus-bar voltage automatically, makes single-phase rectification bridge that power no longer is provided.The rotor-side controller is the monitoring motor rotating speed always, is automatic field suppressing in case rotating speed is lower than synchronous war speed 70%.
Step 3, the operator can set about incorporating generator into infinitely great electrical network after generator machine end is built pressure, and this device does not provide the switching mechanism that is incorporated into the power networks, and has only and network interface.Can be remained on synchronizing frequency by infinitely great electrical network in the back machine end frequency that is incorporated into the power networks, change the rotor-exciting electric voltage frequency and can change motor speed this moment.And motor speed is if be higher than synchronizing frequency, and then the power flow direction of ac-dc-ac inverter system will be from the rotor to the electrical network, and it is then opposite to be lower than synchronizing frequency, thereby realizes the double-fed generating.
Therefore, the present invention has following advantage: 1. and reasonable in design, simple in structure and complete practicality; 2. can be used in the wind generator system of the AC excitation double-fed wind-driven generator of simulation variable speed constant frequency, supply teaching and scientific research to use.
Description of drawings
Fig. 1 is an electrical block diagram of the present invention.
Embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically technical scheme of the present invention.
Embodiment:
A kind of double-fed blower fan excitation controlling device; Comprise wind characteristic analogue means, the ac excitation generating device that links to each other with the wind characteristic analogue means respectively and DSP control device; Described DSP control device also is connected with an excitation potential device, and described excitation potential device links to each other with said ac excitation generating device through an excitation change over switch.AC excitation double-fed wind generator system major loop structure schematic diagram is as shown in Figure 1.The stator of double-fed generator directly links to each other with common frequency power network, rotor then through energy can two-way flow the friendship orthogonal system of two back-to-back SPWM converters (grid side converter and rotor-side converter) compositions link to each other with electrical network.Wherein, AC excitation double-fed wind power generator exciting control system is as scheming by back-to-back pair of SPWM converter, forming based on excitation controller and the unit such as excitation transformer, AC excitation double-fed generator of TMS320F2812.
The ac excitation generating device comprises a separate excitation DC generator and the ac excited generator that links to each other with said wind characteristic analogue means through the separate excitation DC generator; The DSP control device comprises a rotor-side dsp controller and the grid side dsp controller that links to each other with ac excited generator through said rotor-side dsp controller while and above-mentioned separate excitation DC generator; The excitation potential device comprises a flat ripple reactance and the excitation transformer that links to each other with above-mentioned grid side dsp controller through flat ripple reactance; This double-fed blower fan excitation controlling device also comprises the switch that is incorporated into the power networks that a main transformer and an end link to each other with above-mentioned ac excited generator through main transformer; The said switch other end that is incorporated into the power networks is connected with electrical network, and the excitation change over switch is connected with above-mentioned ac excited generator, excitation transformer and civil power respectively.
The interchange end of grid side converter (frequency ± 15Hz, capacity 3kVA) links to each other with electrical network through excitation transformer, DC side then with the DC side parallel of rotor-side converter.The main task of grid side converter is that the voltage of keeping the converter DC side is stablized; Grid side converter using PQ decoupling control policy; Can realize the PQ four quadrant running of converter AC side; When the operation of rotor metasynchronism speed, to rotor exciting power and slip power are provided, when the supersynchronous speed of rotor was moved, the slip power that rotor is exported was sent to electrical network.Also can be according to electrical network to the demand of reactive power and electrical network exchange reactive power, reduce the converter capacity and operate in the unity power factor state but be generally; Its operation principle: frequency-tracking net frequency, the automatic identification of phase sequence adapts to automatically; The VFC of SPWM adopts constant carrier than the mode frequency modulation that changes carrier cycle, tables look-up to obtain the sinusoid pulse width modulation value in each carrier cycle.Employing is synchronous with line voltage, and the method that changes the relative electric network voltage phase of modulating wave is carried out phase modulation, to change active power direction of transfer and size, keeps dc voltage stability on given level.
The DC side of rotor-side converter (frequency 50 ± 1Hz, capacity 3kVA) and the DC side parallel of grid side converter, its AC side links to each other with the rotor winding of double-fed generator.Main task is the exciting current that suitable amplitude and frequency are provided for double-fed generator, realizes the reasonable distribution of reactive power between the stable control of generator terminal voltage, the responsible parallel running unit, realizes maximal wind-energy power tracking etc.Its operation principle: confirm exciting current frequency and phase sequence automatically according to net frequency and rotating speed before being incorporated into the power networks, follow the tracks of the phase place that is incorporated into the power networks, follow the tracks of the line voltage amplitude, being as the criterion is incorporated into the power networks synchronously creates conditions; It is constant to keep the exciting current frequency after being incorporated into the power networks, or by manual adjustment, or is adjusted automatically by the maximum power tracing functional software; When deciding voltage (deciding electric current) control, regulate the size of exporting exciting current automatically according to voltage (electric current) deviation, to keep set end voltage (exciting current) on given level.Adopt the mode frequency modulation of constant carrier cyclomorphosis frequency of modulated wave.
The controller of two SPWM converters, employing be current state-of-the-art in the world 32 fixed point type digital signal processors (DSP) TMS320F2812, this DSP dominant frequency is up to 150MHz; Harvard's bus, pipeline organization, fast operation; Precision is high, and aboundresources in the sheet is powerful.
Excitation transformer mainly is responsible for coupling rotor voltage and stator voltage, transmits slip power and exciting power is provided.Excitation transformer is attempted by generator machine end can constitutes the shunt self excitation mode, it is attempted by constitutes it on the electrical network and encourage excitation mode;
10 absolute optical encoders that this device adopts Autonics company to produce to obtain rotor actual position signal accurately, are realized vector control, guarantee output electric energy constant frequency and constant voltage.Accurately, rotor-position signal is the necessary condition of the normal operation of high-performance speed change constant frequency double-fed electricity generation system reliably.
The wire wound asynchronous motor that AC excitation double-fed generator adopts Electric Traction to use for making its control performance more near similar generator, uses (rated voltage is reduced to 300V by 380V) with the rated voltage derate, makes electromagnetic property more near actual conditions.
During operation, may further comprise the steps:
Step 1, in inactive state, the power supply of dc bus has single-phase rectification bridge to provide, and the operator sends the grid side start-up command, control device can be adjusted to set point with DC bus-bar voltage automatically if it encourages the mode grid side.What grid side control device and rotor-side control device adopted is sinusoidal pulse width modulation.If from the shunt excitation mode, the grid side control device can not adjusted voltage, and the power supply of dc bus is still provided by the single-phase rectification bridge in the cabinet.
Step 2; The operator could send the excitation instruction to the rotor-side control device after step 2 is carried out; And the rotor-side control device can be kept watch on the rotating speed of unit automatically, has only when generating unit speed surpasses synchronous speed 70% and just can automatic excitation build pressure (acquiescence excitation rotating speed is 80% synchronous speed).The function of rotor-side control device is to follow the tracks of rotor speed to make the output voltage frequency of rotor-side frequency converter be the difference of synchronizing frequency and rotating speed, thus the realization asynchronous generating.This moment, in fact the control of grid side and rotor-side formed an ac-dc-ac frequency converter.If from the shunt excitation mode; In just building 3 ~ 5 seconds of pressure, dc bus power is still provided by single-phase rectification bridge, after set end voltage reaches rated value; The grid side control device can be adjusted to set point with DC bus-bar voltage automatically, makes single-phase rectification bridge that power no longer is provided.The rotor-side controller is the monitoring motor rotating speed always, is automatic field suppressing in case rotating speed is lower than synchronous war speed 70%.
Step 3, the operator can set about incorporating generator into infinitely great electrical network after generator machine end is built pressure, and this device does not provide the switching mechanism that is incorporated into the power networks, and has only and network interface.Can be remained on synchronizing frequency by infinitely great electrical network in the back machine end frequency that is incorporated into the power networks, change the rotor-exciting electric voltage frequency and can change motor speed this moment.And motor speed is if be higher than synchronizing frequency, and then the power flow direction of ac-dc-ac inverter system will be from the rotor to the electrical network, and it is then opposite to be lower than synchronizing frequency, thereby realizes the double-fed generating.
Specific embodiment described herein only is that the present invention's spirit is illustrated.Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (7)
1. double-fed blower fan excitation controlling device; It is characterized in that; Comprise wind characteristic analogue means, the ac excitation generating device that links to each other with the wind characteristic analogue means respectively and DSP control device; Described DSP control device also is connected with an excitation potential device, and described excitation potential device links to each other with said ac excitation generating device through an excitation change over switch.
2. a kind of double-fed blower fan excitation controlling device according to claim 2; It is characterized in that described ac excitation generating device comprises a separate excitation DC generator and the ac excited generator that links to each other with said wind characteristic analogue means through the separate excitation DC generator.
3. a kind of double-fed blower fan excitation controlling device according to claim 3; It is characterized in that said DSP control device comprises a rotor-side dsp controller and the grid side dsp controller that links to each other with ac excited generator through said rotor-side dsp controller while and above-mentioned separate excitation DC generator.
4. a kind of double-fed blower fan excitation controlling device according to claim 4 is characterized in that, described excitation potential device comprises a flat ripple reactance and the excitation transformer that links to each other with above-mentioned grid side dsp controller through flat ripple reactance.
5. a kind of double-fed blower fan excitation controlling device according to claim 5; It is characterized in that; This a kind of double-fed blower fan excitation controlling device also comprises the switch that is incorporated into the power networks that a main transformer and an end link to each other with above-mentioned ac excited generator through main transformer, and the said switch other end that is incorporated into the power networks is connected with electrical network.
6. a kind of double-fed blower fan excitation controlling device according to claim 6 is characterized in that above-mentioned excitation change over switch is connected with above-mentioned ac excited generator, excitation transformer and civil power respectively.
7. a control method that adopts the described double-fed blower fan of claim 1 excitation controlling device is characterized in that, may further comprise the steps:
Step 1; In inactive state; The power supply of dc bus has single-phase rectification bridge to provide; The operator sends the grid side start-up command, and control device can be adjusted to set point with DC bus-bar voltage automatically if it encourages the mode grid side, and what grid side control device and rotor-side control device adopted is sinusoidal pulse width modulation; If from the shunt excitation mode, the grid side control device can not adjusted voltage, and the power supply of dc bus is still provided by the single-phase rectification bridge in the cabinet;
Step 2, the operator could send the excitation instruction to the rotor-side control device after step 2 is carried out, and the rotor-side control device can be kept watch on the rotating speed of unit automatically, has only when generating unit speed surpasses synchronous speed 70% and just can automatic excitation build pressure; If from the shunt excitation mode; In just building 3 ~ 5 seconds of pressure, dc bus power is still provided by single-phase rectification bridge, after set end voltage reaches rated value; The grid side control device can be adjusted to set point with DC bus-bar voltage automatically, makes single-phase rectification bridge that power no longer is provided; The rotor-side controller is the monitoring motor rotating speed always, is automatic field suppressing in case rotating speed is lower than synchronous war speed 70%;
Step 3, the operator can set about incorporating generator into infinitely great electrical network after generator machine end is built pressure, and this device does not provide the switching mechanism that is incorporated into the power networks, and has only and network interface; Can be remained on synchronizing frequency by infinitely great electrical network in the back machine end frequency that is incorporated into the power networks, change the rotor-exciting electric voltage frequency and can change motor speed this moment; And motor speed is if be higher than synchronizing frequency, and then the power flow direction of ac-dc-ac inverter system will be from the rotor to the electrical network, and it is then opposite to be lower than synchronizing frequency, thereby realizes the double-fed generating.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490600A (en) * | 2016-02-04 | 2016-04-13 | 华自科技股份有限公司 | Generator excitation system and parameter design method and system thereof |
| CN110168881A (en) * | 2017-01-20 | 2019-08-23 | 法雷奥电机设备公司 | Flux for motor vehicles traction switches rotating electric machine |
| CN112910342A (en) * | 2020-12-27 | 2021-06-04 | 深圳南山热电股份有限公司 | Excitation mode of gas turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040217594A1 (en) * | 2002-02-11 | 2004-11-04 | Vestas Wind Systems A/S | Variable speed wind turbine having a passive grid side rectifier with scalar power control and dependent pitch control |
| CN102064714A (en) * | 2010-12-02 | 2011-05-18 | 永济新时速电机电器有限责任公司 | Doubly-fed wind power frequency converter |
| CN202282758U (en) * | 2011-09-30 | 2012-06-20 | 武汉华大电力自动技术有限责任公司 | Excitation control device for doubly-fed fan |
-
2012
- 2012-09-27 CN CN201210365686.5A patent/CN102843085B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040217594A1 (en) * | 2002-02-11 | 2004-11-04 | Vestas Wind Systems A/S | Variable speed wind turbine having a passive grid side rectifier with scalar power control and dependent pitch control |
| CN102064714A (en) * | 2010-12-02 | 2011-05-18 | 永济新时速电机电器有限责任公司 | Doubly-fed wind power frequency converter |
| CN202282758U (en) * | 2011-09-30 | 2012-06-20 | 武汉华大电力自动技术有限责任公司 | Excitation control device for doubly-fed fan |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490600A (en) * | 2016-02-04 | 2016-04-13 | 华自科技股份有限公司 | Generator excitation system and parameter design method and system thereof |
| CN110168881A (en) * | 2017-01-20 | 2019-08-23 | 法雷奥电机设备公司 | Flux for motor vehicles traction switches rotating electric machine |
| CN112910342A (en) * | 2020-12-27 | 2021-06-04 | 深圳南山热电股份有限公司 | Excitation mode of gas turbine |
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