CN103607105B - A kind of dead time compensation control method and system - Google Patents

Abstract

Disclosure one dead time compensation control method and system. Described dead time compensation control method includes: according to current voltage instruction, carrier cycle and current DC bus-bar voltage, it is thus achieved that the first dutyfactor value of modulating wave; Described first dutyfactor value compensating the compensation of value, it is thus achieved that the second dutyfactor value, the size of described offset is determined by current flow instruction, and described current flow instruction is corresponding with described current voltage instruction; Receive described second dutyfactor value, control the folding of brachium pontis according to described second dutyfactor value.

Description

A kind of dead time compensation control method and system

Technical field

The present invention relates to a kind of electronic technology field, particularly relate to a kind of dead time compensation control method and system.

Background technology

Every brachium pontis (i.e. IGBT, InsulatedGateBipolarTransistor, Chinese full name: insulated gate bipolar transistor) all including about two complementations mutually in three-phase U, V, W in frequency-variable controller hardware circuit. The compound full-control type voltage driven type power semiconductor that each brachium pontis is made up of BJT (double pole triode) and MOS (insulating gate type field effect tube), the strict turn-on and turn-off in turn of upper and lower two brachium pontis.

But practical situation is, the switching of each device is required for the regular hour, and especially the turn-off time is more longer than ON time. In turn off process, if the device of cut-off turns on immediately, necessarily cause bridgc arm short. In order to prevent this from occurring, it is necessary to introduce one section of Dead Time Td in driving signal. Upper and lower two brachium pontis can not simultaneously turn on, it is necessary to insertion dead band real-time wherein, it is ensured that upper and lower two brachium pontis do not result in short circuit, it is ensured that the safety of brachium pontis.

The introducing of Dead Time makes main circuit can not accurately reproduce ideal Modulated waveform produced by modulation wave generator, the voltage and current of impact output so that voltage during low speed underloading and electric current generation Severe distortion, causes torque pulsation and harmonic wave.

Current dead-zone compensation method, or realized by hardware circuit, or coordinate complicated software to realize by complicated model, compensate inaccurate, cause certain " dead time effect ", cause compressor phase current to distort, cause the power pollution to power supply and other electrical equipment, to a certain degree reduce the power factor (PF) of compressor and the performance of system, particularly cause low frequency axis error to estimate the problems such as inaccurate.

Summary of the invention

The application provides a kind of dead time compensation control method and system, solve in prior art, because dead area compensation is inaccurate, cause causing compressor phase current to distort, cause the technical problem to power supply and the power pollution of other electrical equipment, reach to improve the accuracy of dead area compensation, reduce the distortion of electric current, reduce the technique effect to power supply and the power pollution of other electrical equipment.

The application provides a kind of dead time compensation control method, and described dead time compensation control method includes:

According to current voltage instruction, carrier cycle and current DC bus-bar voltage, it is thus achieved that the first dutyfactor value of modulating wave;

Described first dutyfactor value compensating the compensation of value, it is thus achieved that the second dutyfactor value, the size of described offset is determined by current flow instruction, and described current flow instruction is corresponding with described current voltage instruction;

Receive described second dutyfactor value, control the folding of brachium pontis according to described second dutyfactor value.

Preferably, described according to current voltage instruction, carrier cycle and current DC bus-bar voltage, it is thus achieved that the first dutyfactor value of modulating wave, particularly as follows:

According to described current voltage instruction, described carrier cycle and described current DC bus-bar voltage, it is thus achieved that three-phase modulations ripple is at the first dutycycle T of carrier cycle_u、T_vAnd T_w。

Preferably, current flow instruction is vectorProjection respectively I at the coordinate axes of three-phase U, V, W_u ^*、I_v ^*、I_w ^*Time, the size of described offset is determined by current flow instruction, particularly as follows:

The offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wSize respectively with I_u ^*、I_v ^*、I_w ^*The Dead Time T of positive and negative and modulating wave_dSize is correlated with.

Preferably, the offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wSize respectively with I_u ^*、I_v ^*、I_w ^*Positive negative correlation, particularly as follows:

Work as I_u ^*When >=0,I_u ^*During < 0,Work as I_v ^*When >=0,I_v ^*During < 0, $\mathrm{\&Delta;}{T}_v=-\frac{T_d}{2};$ Work as I_w ^* _≥0Time, $\mathrm{\&Delta;}{T}_w=\frac{T_d}{2},$ I_w ^*During < 0, $\mathrm{\&Delta;}{T}_w=-\frac{T_d}{2}.$

Preferably, the described compensation that described first dutyfactor value is compensated value, it is thus achieved that the second dutyfactor value, particularly as follows:

By described first dutyfactor value T_u、T_vAnd T_wRespectively with described offset Δ T_u、ΔT_vWith Δ T_wIt is overlapped, it is thus achieved that described second dutyfactor value T_u1、T_v1And T_w1。

Preferably, existDuring with angle (θ+Φ) between coordinate axes U phase, the offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wSize respectively with I_u ^*、I_v ^*、I_w ^*Positive negative correlation, particularly as follows:

The offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wSize relevant to the size of (θ+Φ) respectively, wherein, θ is rotor and coordinate axes U angle, and θ+Φ isAngle with coordinate axes U.

A kind of dead area compensation controls system, including:

Duty ratio control unit, for according to current voltage instruction, carrier cycle and current DC bus-bar voltage, it is thus achieved that the first dutyfactor value of modulating wave;

Dead area compensation control unit, for described first dutyfactor value compensates the compensation of value, it is thus achieved that the second dutyfactor value, the size of described offset is determined by current flow instruction, and described current flow instruction is corresponding with described current voltage instruction;

Brachium pontis control unit, is used for receiving described second dutyfactor value, controls the folding of brachium pontis according to described second dutyfactor value.

Preferably, described Duty ratio control unit specifically for:

According to described current voltage instruction, described carrier cycle and described current DC bus-bar voltage, it is thus achieved that three-phase modulations ripple is at the first dutycycle T of carrier cycle_u、T_vAnd T_w。

Preferably, current flow instruction is vectorProjection respectively I at the coordinate axes of three-phase U, V, W_u ^*、I_v ^*、I_w ^*Time, the size of described offset is determined by current flow instruction, particularly as follows:

The offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wSize respectively with I_u ^*、I_v ^*、I_w ^*The Dead Time T of positive and negative and modulating wave_dSize is correlated with.

Preferably, the offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wPositive and negative respectively with I_u ^*、I_v ^*、I_w ^*Positive negative correlation, particularly as follows:

Work as I_u ^*When >=0,I_u ^*During < 0,Work as I_v ^*When >=0,I_v ^*During < 0, $\mathrm{\&Delta;}{T}_v=-\frac{T_d}{2};$ Work as I_w ^*When >=0, $\mathrm{\&Delta;}{T}_w=\frac{T_d}{2},$ Time, I_w ^*During < 0, $\mathrm{\&Delta;}{T}_w=-\frac{T_d}{2}.$

Preferably, described dead area compensation control unit specifically for:

By described first dutyfactor value T_u、T_vAnd T_wRespectively with described offset Δ T_u、ΔT_vWith Δ T_wIt is overlapped, it is thus achieved that described second dutyfactor value T_u1、T_v1And T_w1。

Preferably, existDuring with angle (θ+Φ) between coordinate axes U phase, the offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wSize respectively with I_u ^*、I_v ^*、I_w ^*Positive negative correlation, particularly as follows:

The offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wSize relevant to the size of (θ+Φ) respectively, wherein, θ is rotor and coordinate axes U angle, and θ+Φ isAngle with coordinate axes U.

The application has the beneficial effect that:

Above-mentioned dead time compensation control method passes through the offset that current flow instruction is corresponding, first dutyfactor value is compensated accurately, according to the second dutyfactor value after compensating, accurately control brachium pontis and folding, ensure that actual output current is identical with controlling electric current, saltus step is there is not when ensureing the current zero-crossing point in compressor three-phase, avoid current distortion, thus solving in prior art, because dead area compensation is inaccurate, cause causing compressor phase current to distort, cause the technical problem to power supply and the power pollution of other electrical equipment, reach to improve the accuracy of dead area compensation, reduce the distortion of electric current, reduce the technique effect to power supply and the power pollution of other electrical equipment.

By offset Δ T_u、ΔT_vWith Δ T_wRespectively the dutycycle of three-phase U, V, W correspondence phase is compensated, thus ensureing that in three-phase U, V, W, every phase current is that actual output current during positive and negative is identical with controlling electric current, saltus step is there is not, it is to avoid current distortion when ensureing the current zero-crossing point in compressor three-phase.

Accompanying drawing explanation

Fig. 1 is the flow chart of the application the first better embodiment dead time compensation control method;

Fig. 2 is the coordinate schematic diagram of dead time compensation control method in Fig. 1;

Fig. 3 is the block diagram of the system that dead time compensation control method is corresponding in Fig. 1.

Detailed description of the invention

The embodiment of the present application is by providing a kind of dead time compensation control method and system, solve in prior art, because dead area compensation is inaccurate, cause causing compressor phase current to distort, cause the technical problem to power supply and the power pollution of other electrical equipment, reach to improve the accuracy of dead area compensation, reduce the distortion of electric current, reduce the technique effect to power supply and the power pollution of other electrical equipment.

Technical scheme in the embodiment of the present application is for solving above-mentioned technical problem, and general thought is as follows:

A kind of dead time compensation control method, described dead time compensation control method includes:

According to current voltage instruction, carrier cycle and current DC bus-bar voltage, it is thus achieved that the first dutyfactor value of modulating wave;

Described first dutyfactor value compensating the compensation of value, it is thus achieved that the second dutyfactor value, the size of described offset is determined by current flow instruction, and described current flow instruction is corresponding with described current voltage instruction;

Receive described second dutyfactor value, control the folding of brachium pontis according to described second dutyfactor value.

A kind of dead area compensation controls system, including:

Duty ratio control unit, for according to current voltage instruction, carrier cycle and current DC bus-bar voltage, it is thus achieved that the first dutyfactor value of modulating wave;

Dead area compensation control unit, for described first dutyfactor value compensates the compensation of value, it is thus achieved that the second dutyfactor value, the size of described offset is determined by current flow instruction, and described current flow instruction is corresponding with described current voltage instruction;

Brachium pontis control unit, is used for receiving described second dutyfactor value, controls the folding of brachium pontis according to described second dutyfactor value.

Above-mentioned dead time compensation control method passes through the offset that current flow instruction is corresponding, first dutyfactor value is compensated accurately, according to the second dutyfactor value after compensating, accurately control brachium pontis and folding, ensure that actual output current is identical with controlling electric current, saltus step is there is not when ensureing the current zero-crossing point in compressor three-phase, avoid current distortion, thus solving in prior art, because dead area compensation is inaccurate, cause causing compressor phase current to distort, cause the technical problem to power supply and the power pollution of other electrical equipment, reach to improve the accuracy of dead area compensation, reduce the distortion of electric current, reduce the technique effect to power supply and the power pollution of other electrical equipment.

In order to be better understood from technique scheme, below in conjunction with Figure of description and specific embodiment, technique scheme is described in detail.

As it is shown in figure 1, be the flow chart of the application the first better embodiment dead time compensation control method 100. This dead-zone compensation method 100 may be used in motor, it is also possible to in inverter, or in the electrical equipment of other AC-DC-exchanges. Dead time compensation control method 100 comprises the following steps:

Step 110, according to current voltage instruction, carrier cycle and current DC bus-bar voltage, it is thus achieved that the first dutyfactor value of modulating wave. It is to say, the first dutyfactor value of modulating wave is by calculating current voltage instruction, carrier cycle and current DC bus-bar voltage. Current voltage instruction is the V being currently entered_d ^*And V_q ^*Instruction. DC bus-bar voltage Edu is a dynamic value, and DC bus-bar voltage Edu changes along with change and the load change of alternating voltage. Carrier cycle Tc is the carrier cycle of modulating wave, and carrier cycle is the inverse of carrier frequency. According to current voltage instruction, carrier cycle Tc and current DC bus-bar voltage Edu, it is thus achieved that after the first dutyfactor value T of modulating wave, enter step 120.

Step 120, compensates the compensation of value Δ T, it is thus achieved that the second dutyfactor value T to described first dutyfactor value T₁, the size of described offset Δ T is determined by current flow instruction, and described current flow instruction is corresponding with described current voltage instruction. Compensation way can be sue for peace the first duty ratio value and offset to draw the second dutyfactor value, it is also possible to by certain logical algorithm etc., the first duty ratio value and offset are shown the second dutyfactor value. Current flow instruction is current V_d ^*And V_q ^*The I that instruction is corresponding respectively_d ^*And I_q ^*Instruction.

Step 130, receives described second dutyfactor value, controls the folding of brachium pontis according to described second dutyfactor value.

Above-mentioned dead time compensation control method passes through the offset that current flow instruction is corresponding, first dutyfactor value is compensated accurately, according to the second dutyfactor value after compensating, accurately control brachium pontis and folding, ensure that actual output current is identical with controlling electric current, saltus step is there is not when ensureing the current zero-crossing point in compressor three-phase, avoid current distortion, thus solving in prior art, because dead area compensation is inaccurate, cause causing compressor phase current to distort, cause the technical problem to power supply and the power pollution of other electrical equipment, reach to improve the accuracy of dead area compensation, reduce the distortion of electric current, reduce the technique effect to power supply and the power pollution of other electrical equipment.

Specifically, in U, V, W three-phase alternating current, described according to current voltage instruction, carrier cycle and current DC bus-bar voltage, it is thus achieved that the first dutyfactor value of modulating wave, particularly as follows:

According to described current voltage instruction, described carrier cycle and described current DC bus-bar voltage, it is thus achieved that three-phase modulations ripple is at the first dutycycle T of carrier cycle_u、T_vAnd T_w. That is according to current voltage instruction, carrier cycle and current DC bus-bar voltage, the dutycycle T of every phase of three-phase U, V, W is calculated respectively_u、T_vAnd T_w。

As in figure 2 it is shown, three-phase U, V, W are all in ab rectangular coordinate system, wherein, U axle is overlapping with a axle, and U axle and 120 degree of V axle clamp angle, V axle and W axle clamp angle are 120 degree, and W axle and U axle clamp angle are 120 degree. Ab coordinate system also has armature spindle d axle and the q axle vertical with armature spindle. Wherein, θ is the angle between d axle and α axle, is also the position angle of rotor,For motor actual current command vector, by current order vector I_d ^*、I_q ^*Uniquely determine, I_d ^*And I_q ^*The respectively order of d shaft current and q shaft current order.Φ isAngle with coordinate axes d axle and motor rotor position.

Specifically, current flow instruction is vectorProjection respectively I at the coordinate axes of three-phase U, V, W_u ^*、I_v ^*、I_w ^*Time, the size of described offset is determined by current flow instruction, particularly as follows:

The offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wSize respectively with I_u ^*、I_v ^*、I_w ^*The Dead Time T of positive and negative and modulating wave_dSize is correlated with.

It is to say, the dutycycle offset Δ T of every phase of three-phase U, V, W_u、ΔT_vWith Δ T_wWith current phasorProjection I at the coordinate axes of three-phase U, V, W_u ^*、I_v ^*、I_w ^*Relevant, as: work as I_u ^*When >=0, Δ T_uFor just, I_u ^*During < 0, Δ T_uIt is negative; Work as I_v ^*When >=0, Δ T_vFor just, I_v ^*During < 0, Δ T_vFor just, being negative; Work as I_w ^*When >=0, Δ T_wFor just, I_wDuring < 0, Δ T_wIt is negative.

Dead Time T_dSize can pass through to arrange chip internal specified register and determine, its size can change as required.

Further, the offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wSize respectively with I_u ^*、I_v ^*、I_w ^*Positive negative correlation, particularly as follows:

Work as I_u ^*When >=0,I_u ^*During < 0,Work as I_v ^*When >=0,I_v ^*During < 0, $\mathrm{\&Delta;}{T}_v=-\frac{T_d}{2};$ Work as I_w ^*When >=0, $\mathrm{\&Delta;}{T}_w=\frac{T_d}{2},$ I_w ^*During < 0, $\mathrm{\&Delta;}{T}_w=-\frac{T_d}{2}.$

When the brachium pontis folding adopting above-mentioned dead-zone compensation method to control U phase, work as I_u ^*When >=0, control waveform and increase by oneTime, i.e. control brachium pontis delayTime separated so that U+ delaysTime declines, it is ensured that U phase current is that timing actual output current is identical with controlling electric current; I_u ^*During < 0, control waveform and reduce oneTime, i.e. control brachium pontis in advanceTime closes so that U-is in advanceTime rises, it is ensured that U phase current is identical with control electric current for actual output current time negative, it is ensured that during current zero-crossing point in compressor U phase, saltus step does not occur, it is to avoid current distortion.

When the brachium pontis folding adopting above-mentioned dead-zone compensation method to control V phase, work as I_v ^*When >=0, control waveform and increase by oneTime, i.e. control brachium pontis delayTime separated so that V+ delaysTime declines, it is ensured that V phase current is that timing actual output current is identical with controlling electric current; I_v ^*During < 0, control waveform and reduce oneTime, i.e. control brachium pontis in advanceTime closes so that before V-Time rises, it is ensured that V phase current is identical with control electric current for actual output current time negative, it is ensured that during current zero-crossing point in compressor V phase, saltus step does not occur, it is to avoid current distortion.

When the brachium pontis folding adopting above-mentioned dead-zone compensation method to control W phase, work as I_w ^*When >=0, control waveform and increase by oneTime, i.e. control brachium pontis delayTime separated so that W+ delaysTime declines, it is ensured that W phase current is that timing actual output current is identical with controlling electric current; I_w ^*During < 0, control waveform and reduce oneTime, i.e. control brachium pontis in advanceTime closes so that W-is in advanceTime rises, it is ensured that W phase current is identical with control electric current for actual output current time negative, it is ensured that during current zero-crossing point in compressor W phase, saltus step does not occur, it is to avoid current distortion.

Further, the described compensation that described first dutyfactor value is compensated value, it is thus achieved that the second dutyfactor value, particularly as follows:

By described first dutyfactor value T_u、T_vAnd T_wRespectively with described offset Δ T_u、ΔT_vWith Δ T_wIt is overlapped, it is thus achieved that described second dutyfactor value T_u1、T_v1And T_w1. It is to say, T_u1=T_u+ΔT_u, T_v1=T_v+ΔT_v, T_w1=T_w+ΔT_w。

Specifically, existDuring with angle (θ+Φ) between coordinate axes U phase, the offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wSize respectively with I_u ^*、I_v ^*、I_w ^*Positive negative correlation, particularly as follows:

The offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wSize relevant to the size of (θ+Φ) respectively, wherein, θ is rotor a axle and coordinate axes U angle, and θ+Φ isAngle with coordinate axes U.

In specific implementation process, ${I_u}^{*}=\left|\stackrel{\&RightArrow;}{I^{*}}\right|\cos (\mathrm{\&theta;}+\mathrm{\&Phi;}),$ ${I_v}^{*}=\left|\stackrel{\&RightArrow;}{I^{*}}\right|\cos (\mathrm{\&theta;}+\mathrm{\&Phi;}-120),$ ${I_w}^{*}=\left|\stackrel{\&RightArrow;}{I^{*}}\right|\cos (\mathrm{\&theta;}+\mathrm{\&Phi;}+120),$ WhereinRepresent electric currentAmplitude, it is possible to determine I only according to the scope residing for angle (θ+Φ)_u ^*、I_v ^*、I_w ^*Positive and negative; As 0≤(θ+Φ) < 30 °, I_u ^*>=0, I_v ^*< 0, I_w ^*< 0.

I can also be determined by a under type_u ^*、I_v ^*、I_w ^*Positive and negative, by I_d ^*、I_q ^*It is transformed to I to ab change of coordinates by dq coordinate axes_α ^*、I_β ^*, then by I_α ^*、I_β ^*By the conversion of ab coordinate to coordinate axes (U, V, W), it is transformed to I_u ^*、I_v ^*、I_w ^*, thus may determine that I_u ^*、I_v ^*、I_w ^*Positive and negative.

Include as it is shown on figure 3, dead area compensation corresponding to above-mentioned district compensating control method controls system 200:

Duty ratio control unit 210, for according to current voltage instruction, carrier cycle and current DC bus-bar voltage, it is thus achieved that the first dutyfactor value of modulating wave;

Dead area compensation control unit 220, for described first dutyfactor value compensates the compensation of value, it is thus achieved that the second dutyfactor value, the size of described offset is determined by current flow instruction, and described current flow instruction is corresponding with described current voltage instruction;

Brachium pontis control unit 230, is used for receiving described second dutyfactor value, controls the folding of brachium pontis according to described second dutyfactor value.

Specifically, described Duty ratio control unit 210 specifically for: according to described current voltage instruction, described carrier cycle and described current DC bus-bar voltage, it is thus achieved that three-phase modulations ripple is at the first dutycycle T of carrier cycle_u、T_vAnd T_w。

Specifically, current flow instruction is vectorProjection respectively I at the coordinate axes of three-phase U, V, W_u ^*、I_v ^*、I_w ^*Time, the size of described offset is determined by current flow instruction, particularly as follows:

The offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wSize respectively with I_u ^*、I_v ^*、I_w ^*The Dead Time T of positive and negative and modulating wave_dSize is correlated with.

Specifically, the offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wPositive and negative respectively with I_u ^*、I_v ^*、I_w ^*Positive negative correlation, particularly as follows:

Work as I_u ^*When >=0,I_u ^*During < 0,Work as I_v ^*When >=0,I_v ^*During < 0, $\mathrm{\&Delta;}{T}_v=-\frac{T_d}{2};$ Work as I_w ^*When >=0, $\mathrm{\&Delta;}{T}_w=\frac{T_d}{2}$ Time, I_w ^*During < 0, $\mathrm{\&Delta;}{T}_w=-\frac{T_d}{2}.$

Specifically, described dead area compensation control unit specifically for:

By described first dutyfactor value T_u、T_vAnd T_wRespectively with described offset Δ T_u、ΔT_vWith Δ T_wIt is overlapped, it is thus achieved that described second dutyfactor value T_u1、T_v1And T_w1。

Specifically, existDuring with angle (θ+Φ) between coordinate axes U phase, the offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wSize respectively with I_u ^*、I_v ^*、I_w ^*Positive negative correlation, particularly as follows:

The offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wSize relevant to the size of (θ+Φ) respectively, wherein, θ is rotor and coordinate axes U angle, and θ+Φ isAngle with coordinate axes U.

Above-mentioned dead time compensation control method passes through the offset that current flow instruction is corresponding, first dutyfactor value is compensated accurately, according to the second dutyfactor value after compensating, accurately control brachium pontis and folding, ensure that actual output current is identical with controlling electric current, ensure compressor U, V, saltus step is there is not during current zero-crossing point in W phase, avoid current distortion, thus solving in prior art, because dead area compensation is inaccurate, cause causing compressor phase current to distort, cause the technical problem to power supply and the power pollution of other electrical equipment, reach to improve the accuracy of dead area compensation, reduce the distortion of electric current, reduce the technique effect to power supply and the power pollution of other electrical equipment.

By offset Δ T_u、ΔT_vWith Δ T_wRespectively the dutycycle of three-phase U, V, W correspondence phase is compensated, thus ensureing that in three-phase U, V, W, every phase current is that actual output current during positive and negative is identical with controlling electric current, saltus step is there is not, it is to avoid current distortion when ensureing the current zero-crossing point in compressor U, V, W phase.

Although preferred embodiments of the present invention have been described, but those skilled in the art are once know basic creative concept, then these embodiments can be made other change and amendment. So, claims are intended to be construed to include preferred embodiment and fall into all changes and the amendment of the scope of the invention.

Obviously, the present invention can be carried out various change and modification without deviating from the spirit and scope of the present invention by those skilled in the art. So, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (6)

1. a dead time compensation control method, it is characterised in that described dead time compensation control method includes:

According to current voltage instruction, carrier cycle and current DC bus-bar voltage, it is thus achieved that the first dutyfactor value of modulating wave;

Described first dutyfactor value compensating the compensation of value, it is thus achieved that the second dutyfactor value, the size of described offset is determined by current flow instruction, and described current flow instruction is corresponding with described current voltage instruction;

Receive described second dutyfactor value, control the folding of brachium pontis according to described second dutyfactor value.

Wherein, described current flow instruction is vectorProjection respectively I at the coordinate axes of three-phase U, V, W_u ^*、I_v ^*、I_w ^*, offset respectively Δ T that three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_w, work as I_u ^*When >=0, ${\mathrm{\&Delta;T}}_u=\frac{T_d}{2},$ I_u ^*During < 0, ${\mathrm{\&Delta;T}}_u=-\frac{T_d}{2};$ Work as I_v ^*When >=0, ${\mathrm{\&Delta;T}}_v=\frac{T_d}{2},$ I_v ^*During < 0, ${\mathrm{\&Delta;T}}_v=-\frac{T_d}{2};$ Work as I_w ^*When >=0,I_w ^*During < 0,Described T_dDead Time for modulating wave; Or describedWhen being θ+Φ with the angle between coordinate axes U phase, the offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wSize relevant to the size of θ+Φ respectively, wherein, θ is the angle of rotor axis of electric and described coordinate axes U, described in Φ isWith the angle of described rotor axis of electric, described in θ+Φ isAngle with described coordinate axes U.

2. dead time compensation control method as claimed in claim 1, it is characterised in that described according to current voltage instruction, carrier cycle and current DC bus-bar voltage, it is thus achieved that the first dutyfactor value of modulating wave, particularly as follows:

According to described current voltage instruction, described carrier cycle and described current DC bus-bar voltage, it is thus achieved that described three-phase modulations ripple is at the first dutycycle T of carrier cycle_u、T_vAnd T_w。

3. dead time compensation control method as claimed in claim 1, it is characterised in that the described compensation that described first dutyfactor value is compensated value, it is thus achieved that the second dutyfactor value, particularly as follows:

By described first dutyfactor value T_u、T_vAnd T_wRespectively with described offset Δ T_u、ΔT_vWith Δ T_wIt is overlapped, it is thus achieved that described second dutyfactor value T_u1、T_v1And T_w1。

4. a dead area compensation controls system, it is characterised in that described dead area compensation controls system and includes:

Duty ratio control unit, for according to current voltage instruction, carrier cycle and current DC bus-bar voltage, it is thus achieved that the first dutyfactor value of modulating wave;

Dead area compensation control unit, for described first dutyfactor value compensates the compensation of value, it is thus achieved that the second dutyfactor value, the size of described offset is determined by current flow instruction, and described current flow instruction is corresponding with described current voltage instruction;

Brachium pontis control unit, is used for receiving described second dutyfactor value, controls the folding of brachium pontis according to described second dutyfactor value.

Wherein, described current flow instruction is vectorProjection respectively I at the coordinate axes of three-phase U, V, W_u ^*、I_v ^*、I_w ^*, offset respectively Δ T that three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_w, work as I_u ^*When >=0, ${\mathrm{\&Delta;T}}_u=\frac{T_d}{2},$ I_u ^*During < 0, ${\mathrm{\&Delta;T}}_u=-\frac{T_d}{2};$ Work as I_v ^*When >=0, ${\mathrm{\&Delta;T}}_v=\frac{T_d}{2},$ I_v ^*During < 0, ${\mathrm{\&Delta;T}}_v=-\frac{T_d}{2};$ Work as I_w ^*When >=0,I_w ^*During < 0,Described T_dDead Time for modulating wave;Or describedWhen being θ+Φ with the angle between coordinate axes U phase, the offset Δ T that described three-phase modulations ripple is corresponding_u、ΔT_vWith Δ T_wSize relevant to the size of θ+Φ respectively, wherein, θ is the angle of rotor axis of electric and described coordinate axes U, described in Φ isWith the angle of described rotor axis of electric, described in θ+Φ isAngle with described coordinate axes U.

5. dead area compensation as claimed in claim 4 controls system, it is characterised in that described Duty ratio control unit specifically for:

According to described current voltage instruction, described carrier cycle and described current DC bus-bar voltage, it is thus achieved that described three-phase modulations ripple is at the first dutycycle T of carrier cycle_u、T_vAnd T_w。

6. dead area compensation as claimed in claim 4 controls system, it is characterised in that described dead area compensation control unit specifically for:

By described first dutyfactor value T_u、T_vAnd T_wRespectively with described offset Δ T_u、ΔT_vWith Δ T_wIt is overlapped, it is thus achieved that described second dutyfactor value T_u1、T_v1And T_w1。