CN201893600U

CN201893600U - Standby power supply device for wind power pitch system

Info

Publication number: CN201893600U
Application number: CN2010206515441U
Authority: CN
Inventors: 傅建民; 王政; 邓杰; 董友忠
Original assignee: Reenergy Electric Suzhou Co Ltd
Current assignee: Reenergy Electric Suzhou Co Ltd
Priority date: 2010-12-10
Filing date: 2010-12-10
Publication date: 2011-07-06
Anticipated expiration: 2020-12-10

Abstract

The utility model provides a standby power supply device for a wind power pitch system. The standby supply device comprises a diode, a capacitor bank and a capacitor charger, wherein the diode is electrically connected with a DC bus of a power supply; the capacitor bank is connected in parallel with the diode; and the capacitor charger is connected in parallel with the capacitor bank. Compared with the prior art, the utility model has the benefits that an ultracapacitor is adopted to replace an original back up battery pack in the wind power pitch system, and the ultracapacitor charger replacing an original battery charger has stronger reliability and shorter charging time.

Description

The stand-by power supply device of wind power pitch-controlled system

Technical field

The utility model relates to a kind of wind power plant, relates in particular to the stand-by power supply device in a kind of wind power pitch-controlled system.

Background technology

Along with non-renewable energy resources face exhausted awkward situation at world wide, for satisfying suitability for industrialized production and the human lives is required, people are to the concern of solar energy, wind-force, these regenerative resources of waterpower and utilize day by day and promote.Wherein, wind power generation is a kind of relatively ripe energy development technology that developed, especially on the plateau, there is popularization and application widely in area such as coastal.

In wind power pitch-controlled system, pitch-controlled system still can reliably working when guaranteeing the electrical network instantaneous power-down, and fan trouble etc. in particular cases, and pitch-controlled system can draw blade in.System must have the back-up source of oneself.As shown in Figure 1, way in the past be on the dc bus of power supply by diode 10 batteries 12 in parallel, when electrical network just often, backup battery group 12 is in charged state, when since power down or other reasons when causing electric network electric voltage drop, just change into by batteries 12 power supplies.Electrical network just often reverts to mains supply automatically.This scheme belongs to online back-up source scheme, and two power supplys automatically switch, and there are not problems such as switching time, impulse current in the centre.

In wind power pitch-controlled system, backup battery group 12 general employing valve control maintenance-free lead accumulators, and generally adopt switching power circuits to the charger 14 of its charging, control charged state by the voltage of microcomputer monitoring battery.Export certain voltage by the PWM that adjusts switching tube, battery is charged; It is a kind of charging modes of switch power supply type.The instantaneous rising of the voltage of this charging modes, electric current is less relatively, and the charging interval of battery is longer; And be easy to generate oscillatory occurences and the phenomenon of overcharging when being full of at batteries charging.

Though above scheme is widely used, also exposed some problems, mainly be the following aspects:

1: the troublesome maintenance of batteries: the reality of batteries useful life about 3 years.And the replacing of storage battery bothers very much, not only will cut off blower fan, also will carry batteries.

2: the charge in batteries time is long: the charging interval of batteries is long.Fill soon and then shorten the life-span of batteries easily and even fill bad.Trickle charge then the charging interval long.

3: batteries can pollute environment when using: the manufacturing of storage battery, and use link all can pollute to environment.

The utility model content

At the deficiencies in the prior art, the utility model purpose is to provide the stand-by power supply device in a kind of improved wind power pitch-controlled system, and the structure that the super capacitor of adopt more reliably, the charging interval is short adds charger is used as the stand-by power supply device.

For solving the problems of the technologies described above, the technical solution of the utility model is achieved in that

Stand-by power supply device in a kind of wind power pitch-controlled system, wherein, stand-by power supply device in the described wind power pitch-controlled system comprises that one electrically connects the diode of power supply dc bus, the capacitance group in parallel with described diode, and the capacitor charger in parallel with described capacitance group.

Further improve as the present invention, described capacitance group is combined by a plurality of capacitance modules.

Further improve as the present invention, described capacitance group comprises the two groups of first series connection group and second series connection groups by a plurality of capacitance module series connection, the described first series connection group described second series connection group in parallel.

Further improve as the present invention, the described first series connection group is that 15 capacitance modules are in series, and the described second series connection group is that 15 capacitance modules are in series.

Further improve as the present invention, the characteristic of described capacitance module is 16V/58F.

Further improve as the present invention, described capacitor charger comprises switching power circuit, adjusts circuit, adjusts the photoelectric isolating circuit that circuit is connected with described electric current and voltage with the electric current and voltage of described switching power circuit parallel connection, and adjusts circuit monitoring, alarming circuit in parallel with described electric current and voltage.

Further improve as the present invention, described switching power circuit comes external output DC by switching tube switch high-frequency transformer.

Further improve as the present invention, the topological structure of described high frequency transformer is an inverse-excitation type.

Compared with prior art, the beneficial effects of the utility model are: reliability is strong, the charging interval is shorter.

Description of drawings

Fig. 1 is the stand-by power supply manipulated or operated apparatus of the wind power pitch-controlled system of prior art.

Fig. 2 is the stand-by power supply manipulated or operated apparatus of the wind power pitch-controlled system of embodiment of the present utility model.

Fig. 3 is the circuit diagram of capacitance group of the present utility model.

Fig. 4 is the circuit diagram of capacitor charger of the present utility model.

Embodiment

Mode with example describes embodiment of the present utility model with reference to the accompanying drawings.

The utility model has disclosed a kind of stand-by power supply device of wind power pitch-controlled system.

As shown in Figure 2, the stand-by power supply device of wind power pitch-controlled system special use of the present invention comprises the capacitor charger 23 that is used for substituting the capacitance group 21 of prior art back battery pack and is used for substituting the prior art battery charger.Promptly be the diode 20 that electrically connects the dc bus of power supply, with described diode 20 capacitance group 21 in parallel, described capacitance group 21 described capacitor chargers 23 in parallel.

Wherein, capacitance group 21 is in series by capacitance module, to meet the requirements of voltage range.Compare with battery, super capacitor has high power, long shelf-lifeing and benefit such as cycle life.For battery, energy is to store and discharge by the chemical reaction that causes the electrode substance that whole system degenerates.And for electric capacity, energy is that the physical migration by electric charge that is distributed in electrode and the ion in the electrolyte stores and discharges.Owing to discharge and recharge the high reversible physical change process that belongs to pure, capacitor can release energy with faster power than the battery that relies on chemical reaction, and can carry out hundreds of thousands to circulate and performance is not had big influence.Solved the battery problem that runs in use.

Capacitor charger 23 adds Single-chip Controlling by Switching Power Supply and realizes current limliting, pressure limiting, frequency conversion charging.Because the characteristic of electric capacity is different with the characteristic of battery pack, capacitor charger that matches and battery charger are by bigger difference.The quick charge characteristic of electric capacity has determined that the output current of capacitor charger must be bigger, and power output also strengthens naturally, and this has directly caused the volume of high frequency transformer to increase.Miniaturization for charger is unfavorable.This programme utilizes converter technique, when the output voltage of capacitor charger is higher, keeps higher switching frequency, when output voltage is low, keeps lower switching frequency.Frequency range is between 50K-250K.The power output of the transformer of reverse exciting topological structure can by following formulate: Pin=(1/2) * L*I * f wherein L be the inductance value of transformer coil, I is a peak current, f is a switching frequency.When output voltage was low, Pin was also less relatively, and keep less switching frequency this moment, can reduce the loss of switching tube.When output voltage was higher, Pin was also relatively large, and keep higher switching frequency this moment, just can guarantee to export enough power.Do the performance that to give full play to high frequency transformer like this.Also can reduce the heating loss.Because electric capacity is to temperature-insensitive.So also just saved the temperature-compensating part of battery charger in the past.Temperature-compensation circuit in the past needs temperature sensor, and temperature sensor is arranged in by the storage battery, and it often has a segment distance apart from charger.The signal of temperature sensor is low voltage signal often, makes this signal often be interfered easily, as broken string, is disturbed, and during situations such as sensor fault, can cause the fluctuation of charging voltage, and even storage battery is damaged.Just there is not this problem with capacitor charger.

As shown in Figure 3, capacitance group 21 is combined by a plurality of capacitance modules 210.Single capacitance module 210 is 16V/58F.Capacitance group 21 is made of 30 capacitance modules 210 altogether, is the first series connection group with 210 series connection of 15 capacitance modules earlier, is the second series connection group with other 15 capacitance modules, 210 series connection again.And then the first series connection group in parallel and the second series connection group.Capacitance group 21 voltages of Zu Chenging are 240V/7.7F at last.

As shown in Figure 4, capacitor charger 23 comprises switching power circuit 231, the electric current and voltage in parallel with described switching power circuit 231 adjusted circuit 233, adjust the photoelectric isolating circuit 234 that circuit 233 connect with described electric current and voltage, and the monitoring, alarming circuit 235 in parallel with described electric current and voltage adjustment circuit 233.Capacitor charger 23 input power supplys are AC220V, 50Hz.Switching power circuit 231 is finished rectification, filtering and come external output DC by switching tube switch high-frequency transformer, and topological structure is an inverse-excitation type.Electric current and voltage is adjusted circuit 233 and is controlled charged state by the collection to current voltage and current signal.Monitoring, alarming circuit 235 monitors whether the process of charging has unusually, as situations such as overcurrent, overvoltage, fault taking place, external output alarm contact.

Although be the example purpose, preferred implementation of the present utility model is disclosed, but those of ordinary skill in the art will recognize that under situation about not breaking away from by the disclosed scope and spirit of the present utility model of appending claims, various improvement, increase and replacement are possible.

Claims

1. the stand-by power supply device in the wind power pitch-controlled system, it is characterized in that, stand-by power supply device in the described wind power pitch-controlled system comprises that one electrically connects the diode of power supply dc bus, the capacitance group in parallel with described diode, and the capacitor charger in parallel with described capacitance group.

2. according to the stand-by power supply device in the wind power pitch-controlled system described in the claim 1, it is characterized in that: described capacitance group is combined by a plurality of capacitance modules.

3. according to the stand-by power supply device in the wind power pitch-controlled system described in the claim 2, it is characterized in that: described capacitance group comprises the two groups of first series connection group and second series connection groups by a plurality of capacitance module series connection, the described first series connection group described second series connection group in parallel.

4. according to the stand-by power supply device in the wind power pitch-controlled system described in the claim 3, it is characterized in that: the described first series connection group is that 15 capacitance modules are in series, and the described second series connection group is that 15 capacitance modules are in series.

5. according to the stand-by power supply device in the wind power pitch-controlled system described in the claim 4, it is characterized in that: the characteristic of described capacitance module is 16V/58F.

6. according to the stand-by power supply device in the wind power pitch-controlled system described in the claim 1, it is characterized in that: described capacitor charger comprises switching power circuit, adjusts circuit, adjusts the photoelectric isolating circuit that circuit is connected with described electric current and voltage with the electric current and voltage of described switching power circuit parallel connection, and adjusts circuit monitoring, alarming circuit in parallel with described electric current and voltage.

7. according to the stand-by power supply device in the wind power pitch-controlled system described in the claim 6, it is characterized in that described switching power circuit comes external output DC by switching tube switch high-frequency transformer.

8. according to the stand-by power supply device in the wind power pitch-controlled system described in the claim 7, it is characterized in that the topological structure of described high frequency transformer is an inverse-excitation type.