CN203722505U - Modularized power converter for fault-tolerant operation wind-driven electric generator group - Google Patents

Abstract

The utility model discloses a modularized power converter for a fault-tolerant operation wind-driven electric generator group. The modularized power converter for a fault-tolerant operation wind-driven electric generator group comprises m H bridge single-phase sine inversion circuits, each H bridge single-phase sine inversion circuit is connected with direct current bus positive and negative electrodes through two electrically controllable switches, and each H bridge single-phase sine inversion circuit is connected with one electricity generating winding phase of a fault-tolerant wind-driven electric generator through an electrically controllable switch. The modularized power converter is reasonable in structure and good in work performance, serial numbers of fault winding phases indicated by an indicating device and fault types corresponding to the serial numbers can be discriminated according to equipment electrical faults, and on-line overhaul can be realized without machine halts.

Description

The modular power converters of the wind turbine generator of fault-tolerant operation

Technical field

The utility model relates to wind-driven generator and Fault Tolerance Control Technology field, is specifically related to a kind of modular power converters of wind turbine generator of fault-tolerant operation.

Background technology

Wind power generation is the regenerative resource of the current extensive development potentiality of tool, and every country has all dropped into a huge sum of money and competitively researched and developed, and actively pushes forward industrialization process, the application of exploiting market energetically.

Because wind resource distributes, wind power plant is installed on suburb geographical and that meteorological condition is more severe or the physical features eminence in urban district more.Once equipment installs, operational management and the repair and maintenance of unit are extremely inconvenient, and for this reason, the continuous reliability service ability that improves wind turbine generator is an important technology in wind power plant research and development manufacture field.Due to wind-driven generator, be one of core component in wind power plant, therefore, its reliability service and fault-tolerant operation ability are particularly important.

At present, the generator for wind generator system mainly has threephase alternator, DC permanent-magnetic brushless generator and switch reluctance generator.Threephase alternator (as synchronous, double-fed asynchronous, mouse cage asynchronous, winding asynchronous in permanent-magnet synchronous, electric excitation etc.) and DC permanent magnetic generator; adopt distributed symmetric winding structure; when a certain phase winding opens circuit or short trouble; or a certain phase power inverter is when break down; air-gap field distortion; from operation mechanism, cause generator out of control; cannot reach as the basic controlling target of the wind power generations such as strong wind power tracking control; if shut down not in time, its serious torque is jolted and will inevitably be damaged plant equipment.Switch reluctance generator adopts winding in symmetric set, when a certain phase winding opens circuit or short trouble, or a certain phase power inverter is when break down, although can move by phase-lacking fault-tolerant, but its intrinsic teeth groove pulsation and imbalance radially magnetic pull characteristic can be exaggerated, generating torque produces periodically serious pulsation, very easily causes the dangerous of the damage of wind turbine and accessory machinery thereof and unit.

Therefore, from improving reliability index angle, avoid the generator of traditional distributed symmetric winding structure cannot phase-deficient operation, and the deficiency of the large torque pulsation of switch reluctance generator, a set of wind-driven generator and the driving control system thereof with fault-tolerant operation ability and low torque ripple of research and design has good engineering and economic implications.

Utility model content

It is a kind of rational in infrastructure that the purpose of this utility model is to provide, the fault-tolerance aerogenerator of favorable working performance.

Technical solution of the present utility model is:

A modular power converters for the wind turbine generator of fault-tolerant operation, is characterized in that: include m the single-phase sine-converter circuit of H bridge; The single-phase sine-converter circuit of each H bridge is all connected with negative pole with DC bus is anodal respectively by 2 electric gate-controlled switches; The single-phase sine-converter circuit of each H bridge is all connected with 1 generating winding of fault-tolerance aerogenerator mutually by 1 electric gate-controlled switch.

The utility model is rational in infrastructure, favorable working performance; Can differentiate the numbering of the fault winding phase indicating with indicating device and corresponding fault type thereof according to electrical equipment failure, carry out online on-line maintenance.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the utility model is described in further detail.

Fig. 1 is modular power converters structure chart.

Fig. 2 is for being used system global structure figure of the present utility model.

Fig. 3 is the sectional structure chart of fault-tolerance aerogenerator.

Fig. 4 is the control principle drawing of the outer ring controller of full blast speed optimum torque.

Embodiment

A modular power converters for the wind turbine generator of fault-tolerant operation, includes m the single-phase sine-converter circuit of H bridge; The single-phase sine-converter circuit of each H bridge is all connected with negative pole with DC bus is anodal respectively by 2 electric gate-controlled switches; The single-phase sine-converter circuit of each H bridge is all connected with 1 generating winding of fault-tolerance aerogenerator mutually by 1 electric gate-controlled switch.

Specifically, referring to accompanying drawing 1, the centralized power generation winding of fault-tolerance aerogenerator phase 4, by electric gate-controlled switch 13, is connected with the single-phase sine-converter circuit 8 of H bridge of modular power converters.The single-phase sine-converter circuit 8 of H bridge of modular power converters is connected with bus anodal 9 by electric gate-controlled switch 11, by electric gate-controlled switch 12, is connected with bus negative pole 10.The number of the single-phase sine-converter circuit 8 of H bridge of modular power converters is identical with the number of the centralized power generation winding phase of fault-tolerance aerogenerator.Modular power converters, can differentiate the numbering of the fault winding phase indicating with indicating device and corresponding fault type thereof according to electrical equipment failure, carries out online on-line maintenance.

Referring to accompanying drawing 2, use the wind turbine generator of a kind of fault-tolerant operation of the present utility model mainly by ring controller, logic switching and pulse-width-modulation driver etc. in wind turbine, fault-tolerance aerogenerator, modular power change device, multiple sensor signals detector, electrical equipment failure differentiation and indicating device, the outer ring controller of full blast speed optimum torque, fault-tolerant decision-making, partly to be formed.

Referring to accompanying drawing 3, fault-tolerance aerogenerator is mainly comprised of stator 1, m stator electromagnetic isolation tooth 2 on stator circumference internal diameter, m stator armature generating tooth 3 on stator circumference internal diameter, m the centralized power generation winding phase 4, rotor 5, the sinusoidal permanent magnet array 6 of Surface Mount on rotor diameter that generate electricity on tooth 3 around stator armature.M stator electromagnetic isolation tooth 2 and m stator armature generating tooth 3, in stator circumference space, are evenly uniformly-spaced staggered, and its end all has pole shoe 7 structures, to obtain good magnetic field sine distribution character; On m stator electromagnetic isolation tooth 2, all do not install around winding; In Fig. 3, m=8.According to Electrical Motor principle, under the effect of stator electromagnetic isolation tooth 2, the interference of the electromagnetic coupled between 4 is very little mutually for each winding that generates electricity, and can realize winding 4 independent control the mutually of respectively generating electricity.

The give a dinner for a visitor from afar rotary main shaft of turbine of the rotor 6 of fault-tolerance aerogenerator, the stator 1 of fault-tolerance aerogenerator is relatively static.While rotating under the drive of fault-tolerance aerogenerator rotor 6 at wind turbine, its m centralized power generation winding 4 can, under the cutting of permanent magnetism sine magnetic power air-gap field, produce sinusoidal generating voltage mutually.

Multiple sensor signals detector, comprises air velocity transducer, speed probe, voltage sensor, current sensor; The detection of realization to the voltage and current of wind speed, wind turbine rotating speed, fault-tolerance aerogenerator rotating speed and m generating winding phase.

Electrical equipment failure is differentiated and indicating device, and the voltage and current signal of the fault-tolerance aerogenerator m providing according to multiple sensor signals detector generating winding phase 4, carries out fault distinguishing.Its rule comprises: (1) is if the electric current of certain generating winding phase of fault-tolerance aerogenerator, mean value in one-period is not equal to zero, and and zero differ larger, the average current value that is obviously not equal to other phases, showing, there is " power electronic element inefficacy " fault in the single-phase sine-converter circuit of H bridge being connected with this generating winding.(2) if the current instantaneous value of certain generating winding phase of fault-tolerance aerogenerator is equal to zero in a plurality of detection sampling period, being obviously not equal to the current value of other phases, showing, there is " winding overhang opens circuit " fault in this generating winding mutually.(3) if the current effective value of certain generating winding phase of fault-tolerance aerogenerator becomes suddenly large, meanwhile, floating voltage effective value diminishes suddenly, is obviously not equal to the voltage and current value of other phases, showing, there is " winding overhang short circuit " fault in this generating winding mutually.

Electrical equipment failure is differentiated and indicating device, according to above-mentioned rule, carries out fault distinguishing, obtains the numbering of fault-tolerance aerogenerator k fault winding phase, wherein k≤m; And k the fault type that fault winding is mutually corresponding; These fault types comprise: power electronic element failure of removal, winding overhang open circuit fault, winding overhang short trouble.

Electrical equipment failure is differentiated and indicating device, and by the numbering of the k detecting a fault winding phase, and k the mutually corresponding fault type of fault winding offer display device and indicate, for attendant's fast inspection and the maintenance of generating set.

Referring to accompanying drawing 4, the outer ring controller of full blast speed optimum torque, the current i of the fault-tolerance aerogenerator rotational speed omega first providing according to multiple sensor signals detector and m generating winding phase thereof _xwith voltage u _xsignal (x=1,2 ..., m), converse current total generating electromagnetic torque value T _ef; The wind speed v signal providing according to multiple sensor signals detector again and wind turbine rotational speed omega _wtsignal, the wind energy absorption best torque curved line relation according to wind turbine, obtains the pneumatic dtc signal T of current optimum _opm ^*; The pneumatic dtc signal of optimum and current total generating electromagnetic torque value are subtracted each other to T _opm ^*-T _ef, its difference is carried out pid control algorithm computing, draws current optimal power generation total current control command signal i _q ^*, and offer ring controller in fault-tolerant decision-making.

Described logic is switched and pulse-width-modulation driver, according to the individual non-fault winding of fault-tolerance aerogenerator (m-k) that in fault-tolerant decision-making, ring controller provides optimal power generation phase current command signal separately mutually, form the pwm control signal of the single-phase sine-converter circuit of corresponding (m-k) individual healthy phases H bridge; And the disconnection control signal of 3k electric gate-controlled switch in the single-phase sine-converter circuit of H bridge corresponding to k fault phase.Particularly, ring controller in fault-tolerant decision-making, first according to electrical equipment failure, differentiate the numbering of k the fault winding phase providing with indicating device, output logic control signal is switched and pulse-width-modulation driver to logic, the pwm control signal that makes corresponding failure winding number mutually the power electronic element in the single-phase sine-converter circuit 8 of corresponding H bridge blocks, and its 3 the electric gate-controlled switches 11,12,13 that are connected are disconnected, to reach the object that k fault winding is realized mutually to electrical isolation.

Because this k fault winding realized electrical isolation mutually, therefore, the attendant of generating set can differentiate numbering and the fault type thereof of the fault winding phase indicating with indicating device according to electrical equipment failure, carry out online on-line maintenance.Comprising: for " power electronic element failure of removal ", can directly change the single-phase sine-converter circuit of H bridge that this fault winding phase connects, to get rid of this fault; For " winding overhang open circuit fault " and " winding overhang short trouble ", can to get rid of this fault, or do conservative processing by manual observation and further measurement to determine concrete fault point, the integral body of waiting until is in the future overhauled.

The numerical value of the individual non-fault winding of fault-tolerance aerogenerator (m-k) that in described fault-tolerant decision-making, ring controller calculates optimal power generation phase current command signal separately can be not identical.

Ring controller in fault-tolerant decision-making, the more current optimal power generation total current control command signal i providing according to the outer ring controller of full blast speed optimum torque _q ^*, according to coordinating to wait, hold allocation algorithm, to the individual non-fault generating winding of fault-tolerance aerogenerator residue (m-k), distribute mutually the optimal power generation phase current command signal i of each phase _qp ^*, wherein, p=1,2 ..., m-k.It is coordinated to wait and holds allocation algorithm with this (m-k) individual healthy phases optimal power generation phase current command signal i separately _qp ^*it is target that vector forms circular magnetic field, and with copper loss, minimum and total generation current value equals or approaches optimal power generation total current control command signal i _q ^*for constraints, concrete solving equation can be expressed as

$\underset{x=1}{\overset{m}{\mathrm{\Σ}}}{\stackrel{\→}{F}}_x=\underset{y=1}{\overset{m-k}{\mathrm{\Σ}}}{\stackrel{\→}{F}}_y---\left(1\right)$

$P_{\mathrm{Cu}}=\underset{y=1}{\overset{m-k}{\mathrm{\Σ}}}{i}_{y}R---\left(2\right)$

Formula (1) the equal sign left side represents when the whole m of fault-tolerance aerogenerator generating windings are all normally worked mutually, the circular rotating magnetic potential that should produce, equal sign the right represents that fault-tolerance aerogenerator is when only having (m-k) individual non-fault generating winding normally to work mutually, the circular rotating magnetic potential of the required generation of each healthy phases.Formula (1) has guaranteed that fault-tolerance aerogenerator is excised front and back k generating winding phase factor fault by electrical isolation, and the magnetic potential of generation is equal, and circular magnetic field and total current are worth the appearance distribution principles such as constant coordination.Formula (2) is (m-k) individual non-fault generating winding phase current i _ythe copper loss producing, wherein, y=1,2 ..., m-k.Because there is many solutions situation in formula (1), therefore, add formula (2) to get this constraints of minimum value, can be so that the solution of formula (1) be unique.Obviously, i _yfinal solution be i _qp ^*.

In fault-tolerant decision-making, ring controller will resolve the optimal power generation phase current command signal i of (m-k) that obtain individual non-fault winding phase _qp ^*offering logic switches and pulse-width-modulation driver.Logic is switched and the stagnant ring modulation control method of pulse-width-modulation driver employing containing current closed-loop, form the pwm control signal of the power electronic element in the single-phase sine-converter circuit 8 of corresponding (m-k) mutually corresponding H bridge of individual non-fault winding, the object of controlling finally to complete the optimum wind-powered electricity generation power conversion of this wind turbine generator under full blast speed operating mode.

Claims (1)

1. a modular power converters for the wind turbine generator of fault-tolerant operation, is characterized in that: include m the single-phase sine-converter circuit of H bridge; The single-phase sine-converter circuit of each H bridge is all connected with negative pole with DC bus is anodal respectively by 2 electric gate-controlled switches; The single-phase sine-converter circuit of each H bridge is all connected with 1 generating winding of fault-tolerance aerogenerator mutually by 1 electric gate-controlled switch.