CN103021240B - A kind of low-voltage asynchronous wind power generating set and grid-connected dynamic simulator system thereof - Google Patents
A kind of low-voltage asynchronous wind power generating set and grid-connected dynamic simulator system thereof Download PDFInfo
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- CN103021240B CN103021240B CN201210535431.9A CN201210535431A CN103021240B CN 103021240 B CN103021240 B CN 103021240B CN 201210535431 A CN201210535431 A CN 201210535431A CN 103021240 B CN103021240 B CN 103021240B
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Abstract
The invention discloses a kind of low-voltage asynchronous wind power generating set and grid-connected dynamic simulator system thereof, comprise the physical model of wind power generating set, power transmission and distribution transformer and circuit, described wind power generating set comprises microcontroller, low voltage motor arrangements for speed regulation, low-tension motor, low pressure asynchronous wind driven generator, lower pressure rectifier controller, low pressure inverter, energy storage device.The present invention completes low-voltage asynchronous wind power generating set and grid-connected dynamic simulator system thereof, build the so complete wind generator system of generating main circuit, power transmission and distribution circuit, devise the imitative experiment platform based on low-voltage asynchronous wind power generating set.By the output pulse of microcontroller, this device can simulate multiple wind power generation mode.The present invention is that the design studies of wind generator system control & protection strategy and control system provides more reliable, a safe research platform and test environment.
Description
Technical field
The present invention relates to electric utility, particularly relate to a kind of low-voltage asynchronous wind power generating set and grid-connected dynamic simulator system thereof.
Background technology
In today that the energy is day by day in short supply, the step that various green regenerative energy sources is pursued in countries in the world never stops.Wherein, wind energy is one of people's regenerative resource that can utilize, and wind-force is one of generation technology of more ripe, the on the largest scaleization exploit condition of technology and commercialized development prospect in generation of electricity by new energy technology for generating electricity.Generator is critical component in wind generating technology or device, and is the particular/special requirement met in performance in wind power generation field, usually adopts asynchronous generator.But asynchronous generator is all MW class in actual power process, floor area large equipment is expensive, is unfavorable for carrying out scientific research and education experiment in the lab.For the ease of laboratory study, eager needs sets up a set of wind generator system dynamic simulator system being applicable to laboratory study, teaching.
Summary of the invention
Object of the present invention is exactly for solving the problem, the low-voltage asynchronous wind power generating set providing a kind of laboratory to use and grid-connected dynamic simulator system thereof, research for electric power system control strategy provides a safety, reliable, floor area is little, economical and practical, be easy to the experiment porch of control, has ensured experimenter, the student personal safety in experimentation.Although low than in reality of the electric pressure of the low-voltage asynchronous genset adopted, its electromagnetic property is all identical, can reach the level simulating actual asynchronous wind driven generator group electricity generation system.
To achieve these goals, the present invention adopts following technical scheme.
Low-voltage asynchronous wind power generating set and a grid-connected dynamic simulator system thereof, comprise the physical model of wind power generating set, power transmission and distribution transformer and circuit; Described wind power generating set comprises microcontroller, low voltage motor arrangements for speed regulation, low-tension motor, low pressure asynchronous wind driven generator, lower pressure rectifier controller, low pressure inverter, energy storage device; Described microcontroller provides tach signal for low voltage motor arrangements for speed regulation, simulates actual turned curve; Described low voltage motor arrangements for speed regulation receive the pulse signal of self-controller, export different frequencies to low-tension motor, regulate the rotating speed of low-tension motor; Described low pressure asynchronous wind driven generator adopts three-phase low-voltage Asynchronous Communication asynchronous generator; Described lower pressure rectifier controller is converted to stable power frequency low-voltage direct electric energy to the low-voltage alternating-current electric energy of the instability that low voltage generator sends, there is short circuit simultaneously, the mistake of overload and battery pack puts, overcharges automatic protection functions, effectively can extend the serviceable life of battery pack; Described low pressure inverter is converted to power frequency low-voltage alternating-current electric energy, for low-voltage load to the power frequency low-voltage direct electric energy that lower pressure rectifier controller exports; Described energy storage device can for wind generator system.
Described three-phase low-voltage Asynchronous Communication asynchronous generator comprises the common asynchronous generators such as squirrel-cage, and based on asynchronous blower fan, grid-connected and carry out the generator that controls, as double-fed wind power generator through power electronic equipment.
Described low-tension motor adopts one or several motor, and described motor adopts speed adjustable DC motor
Energy storage device can adopt one or more of accumulator, super capacitor, flywheel energy storage, pressurized air etc.
Described power transmission and distribution transformer is step-up transformer, by boosted voltage, reduces electric energy loss on the line; The physical model of described circuit, goes out to go out according to equivalent circuit formulae discovery the numerical value of resistance, inductance, electric capacity according to equivalent circuit formulae discovery, take out the equivalent circuit of power circuit with resistance, inductance, electric capacity.
Principle of work of the present invention is described in detail below in conjunction with structure composition of the present invention:
Low-voltage asynchronous wind power generating set of the present invention and grid-connected dynamic simulator system structure thereof, as shown in Figure 1, in whole system, power transmission and distribution transformer, low pressure asynchronous wind driven generator, low-tension motor, resistance, inductance, electric capacity, low pressure inverter, lower pressure rectifier controller all adopt the electric pressure of 380V and below 380V, and wherein low-tension motor, low pressure asynchronous wind driven generator adopt below 110V electric pressure.The reduction of electric pressure, makes native system more easily use low voltage component to carry out relevant control, does not affect the actual effect of wind generator system dynamic simulator system simultaneously.
Asynchronous wind driven generator structure is simple, firmly, absence of collector and carbon brush, reliability is high.Do not limit by field of employment.Due to without rotor-exciting magnetic field, do not need the same period and voltage regulating device, power station equipment simplifies.Spatial load forecasting is very simple, although asynchronous generator may wave phenomenon, the concussion similar without synchronous generator and step-out problem by emergent power, and net operation is very simple.The present invention adopts low-voltage asynchronous aerogenerator, and the asynchronous wind driven generator group in simulation reality and grid-connected system thereof, make asynchronous wind driven generator group to be better applied in wind generator system.
Microcontroller is small controller mainly, as single-chip microcomputer, DSP etc., and can provide multiple network interface or field-bus interface, and microcontroller carries out the transmission of pulse signal by network interface or field-bus interface and motor speed control device, completes necessary control.Microcontroller regulates motor speed control device by the pwm pulse way of output, can control the speed of low-voltage motor, thus reach the adjustment to low pressure asynchronous generator spinner velocity, controls the size of generating electric energy.
Because the moment of wind energy changes, the electric energy that low pressure asynchronous wind driven generator group sends is unstable AC energy, need to carry out rectification by lower pressure rectifier controller to the unstable AC energy that low pressure asynchronous generator sends, and control electric energy and reach stable DC and export, make sent electric energy flow into energy storage device or low pressure inverter further.Low-voltage load can be used can to detect the generating quality of power supply, and low-voltage load can be electricity-saving lamp or battery etc.
The low pressure physical components and parts that some native systems use are difficult to find in the market, such as low pressure inverter is all much be the household electricity of alternating current 220V by other electric pressure inversions, market is difficult to find low pressure inverter to be the inverter of the inverter of more low-voltage-grade alternating current, such as 24V, 12V by voltage inversion.Single low-voltage rectifier, low voltage generator, the market demand is little, seldom has manufacturer production.This is a key point to the exploitation of native system, and to low-voltage device success development research, and to be applied in native system be an innovative point.
The present invention completes a low-voltage asynchronous wind power generating set and grid-connected dynamic simulator system thereof, build the so complete wind generator system of the physical model of wind power generating set, power transmission and distribution transformer and circuit, devise the imitative experiment platform based on low-voltage asynchronous wind power generating set.By the output pulse of microcontroller, this device can simulate multiple wind power generation mode, is applicable to laboratory to the further research of wind-power electricity generation.
Beneficial effect of the present invention:
1. reduce the electric pressure of wind generator system dynamic simulator system, be more suitable for the teaching and scientific research inside laboratory.
2. for the design studies of electric power system control Preservation tactics and control system.
3. for studying the research of asynchronous generator control strategy in wind-power electricity generation.
Accompanying drawing explanation
Fig. 1 is general structure schematic diagram of the present invention.
Fig. 2 is that the present invention simulates power circuit equivalent circuit diagram.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
A kind of low-voltage asynchronous wind power generating set of the present embodiment and grid-connected dynamic simulator system thereof, comprise the physical model of wind power generating set, power transmission and distribution transformer and circuit; Described wind power generating set comprises microcontroller, low voltage motor arrangements for speed regulation, low-tension motor, low pressure asynchronous wind driven generator, lower pressure rectifier controller, low pressure inverter, energy storage device; Described microcontroller provides tach signal for low voltage motor arrangements for speed regulation, simulates actual turned curve, and the STM32F103VET6 chip that the present embodiment adopts ST Microelectronics to produce carries out pulse and exports control; Described low voltage motor arrangements for speed regulation receive the pulse signal of self-controller, export different frequencies to low-tension motor, regulate the rotating speed of low-tension motor, and the present embodiment adopts the frequency converter that can receive microcontroller output of pulse signal; Described low-tension motor adopts one or several motor, and described motor adopts speed adjustable DC motor, and the present embodiment adopts 12V direct current motor; Described low pressure asynchronous wind driven generator, comprises the common asynchronous generators such as squirrel-cage, and based on asynchronous blower fan, grid-connected and carry out the generator that controls through power electronic equipment, as double-fed wind power generator, the present embodiment asynchronous generator adopts common asynchronous alternating current generator; Described lower pressure rectifier controller is converted to stable power frequency low-voltage direct electric energy to the low-voltage alternating-current electric energy of the instability that low pressure asynchronous generator sends, and the present embodiment adopts 50HZ three-phase alternating current 12V input, the lower pressure rectifier controller that direct current 12V exports; Described low pressure inverter is converted to power frequency low-voltage alternating-current electric energy to the power frequency low-voltage direct electric energy that lower pressure rectifier controller exports, and for low-voltage load, the present embodiment adopts 50HZ direct current 12V input, the low pressure inverter that three-phase alternating current 12V exports; Described energy storage device can wait renewable energy system for the generating of wind-force Generate, Generation, Generator volt, and energy storage device can adopt one or more of accumulator, super capacitor, flywheel energy storage, pressurized air etc., the present embodiment employing accumulator.
Described power transmission and distribution transformer is step-up transformer, and by boosted voltage, reduce electric energy loss on the line, the present embodiment adopts 2 step-up transformers, and the no-load voltage ratio of step-up transformer is respectively 12V/24V and 24V/380V; The physical model of described circuit, calculates the numerical value of each electronic component according to equivalent circuit, take out the equivalent circuit of power circuit with resistance, inductance, electric capacity, and the present embodiment adopts π type equivalent circuit to calculate, and carries out analog computation to 100KM power circuit.
Simulation power circuit π type equivalent circuit is simulated, and can simulate respectively with line capacitance over the ground, the π type equivalent circuit of one section of circuit as shown in Figure 2, and calculates the parameter of each electronic devices and components according to formula (1) (2):
Z=R+jX=r
1l+x
1l formula (1)
Y=G+jB=jB=jb
1l formula (2)
In formula (1), Z is the impedance of power circuit, and R is power circuit resistance, and j is imaginary unit, and X is the reactance of power circuit, r
1for the resistance of power circuit unit length, x
1for the reactance of power circuit unit length; In formula (2), Y is the admittance of power circuit, and G is the conductance of power circuit, and j is imaginary unit, and B is the susceptance of power circuit, b
1the susceptance of power circuit unit length; Wherein in formula (1) (2), l is the length of power circuit.
The present embodiment is simulated wind-power electricity generation, microcontroller sends the pulse waveform of simulation wind speed in autumn, motor speed control device is controlled, direct current motor drags three-phase asynchronous wind power generating machine and generates electricity, the alternating current of power frequency 50HZ voltage 12V is obtained by commutation controller and inverter, power generation process is consistent with actual power process, and power circuit (setting power circuit length l as 100KM) parameter is calculated according to formula (1) (2).
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still in protection scope of the present invention.
Claims (4)
1. low-voltage asynchronous wind power generating set and a grid-connected dynamic simulator system thereof, is characterized in that, comprises the physical model of wind power generating set, power transmission and distribution transformer and circuit; Described wind power generating set comprises microcontroller, low voltage motor arrangements for speed regulation, low-tension motor, low pressure asynchronous wind driven generator, lower pressure rectifier controller, low pressure inverter, energy storage device; Described microcontroller provides tach signal for low voltage motor arrangements for speed regulation, simulates actual turned curve; Described low voltage motor arrangements for speed regulation receive the pulse signal of self-controller, export different frequencies to low-tension motor, regulate the rotating speed of low-tension motor; Described low pressure asynchronous wind driven generator adopts three-phase low-voltage Asynchronous Communication asynchronous generator; Described lower pressure rectifier controller is converted to stable low-voltage direct electric energy to the low-voltage alternating-current electric energy of the instability that low voltage generator sends, and has short circuit simultaneously, the mistake of overload and battery pack puts, overcharges automatic protection functions; Described low pressure inverter is converted to power frequency low-voltage alternating-current electric energy, for low-voltage load to the low-voltage direct electric energy that lower pressure rectifier controller exports; Described energy storage device is for wind generator system; Described power transmission and distribution transformer is step-up transformer; The physical model of described circuit, goes out to go out according to equivalent circuit formulae discovery the numerical value of resistance, inductance, electric capacity according to equivalent circuit formulae discovery, take out the equivalent circuit of power circuit with resistance, inductance, electric capacity;
Described three-phase low-voltage Asynchronous Communication asynchronous generator comprises the common asynchronous generator of squirrel-cage, and based on asynchronous blower fan, grid-connected and carry out the generator that controls through power electronic equipment; Described power transmission and distribution transformer, low pressure asynchronous wind driven generator, low-tension motor, resistance, inductance, electric capacity, low pressure inverter, lower pressure rectifier controller all adopt the electric pressure of below 380V; Microcontroller carries out the transmission of pulse signal by network interface or field-bus interface and motor speed control device, completes necessary control; Microcontroller regulates motor speed control device by the pwm pulse way of output, controls the speed of low-voltage motor, thus reaches the adjustment to low pressure asynchronous generator spinner velocity, controls the size of generating electric energy.
2. low-voltage asynchronous wind power generating set as claimed in claim 1 and grid-connected dynamic simulator system thereof, it is characterized in that, described low-tension motor adopts one or several speed adjustable DC motors.
3. low-voltage asynchronous wind power generating set as claimed in claim 1 and grid-connected dynamic simulator system thereof, is characterized in that, described energy storage device adopt accumulator, super capacitor, flywheel energy storage, compressed-air actuated one or more.
4. low-voltage asynchronous wind power generating set as claimed in claim 1 or 2 and grid-connected dynamic simulator system thereof, is characterized in that, described low-tension motor, low pressure asynchronous wind driven generator adopt below 110V electric pressure.
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| CN102982713A (en) * | 2012-12-12 | 2013-03-20 | 山东大学 | Dynamic simulation system for low-voltage permanent magnetic direct-drive wind generating set and synchronization |
| CN103939290B (en) * | 2014-04-17 | 2017-05-10 | 武汉新能源接入装备与技术研究院有限公司 | Simulation wind turbine generator suitable for virtual inertia optimization control research |
| CN103943009B (en) * | 2014-04-17 | 2016-09-28 | 武汉新能源接入装备与技术研究院有限公司 | A kind of grid-connected experimental system of simulating wind power generation |
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