CN100486094C - Auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier - Google Patents

Abstract

This invention relates to auxiliary resonance polarity reversal three-phase voltage pulsewidth modulation rectifier. It is composed of: (1). Three-phase full bridge circuit which is composed of series connected inductors L(R), L(S), L(T); power switching elements V1-V6; buffer capacitor C1-C6 and parallel connected diodes D1-D6, and (2). resonant circuit which is composed of auxiliary switching elements V(A), V(B), several diodes, voltage dividing capacitors C(d1) and C(d2) and resonant inductor L(r). Several group of diodes are parallel connected between collector pole of V(A) and emitting pole of V(B). One end of L(r) is connected with emitting pole of V(A) and collector pole of V(B). Another end of L(r) is connected to negative end of C(d1) and the positive end of C(d2). The positive and negative ends of C(d1) and C(d2) are connected to two ends of load. Advantages are: simple structure, easy to be controlled.

Description

Auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier

Technical field

The present invention relates to a kind of being arranged in the power-converting device, be used for the power converter of the soft switch motion of electric energy transmitting and power switch component, relate in particular to a kind of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier.

Background technology

Change in the power converter of direct current DC at alternating current AC, can the alternating current of electrical network be become the direct current supply load with pulse width modulation rectifier.The three-phase diode rectifier of present industrial usefulness or the distortion of the phase current waveform of silicon controlled rectifier are serious, contain a large amount of harmonic contents, and total harmonic distortion is more than 26%.In the rectifier that uses pulse width modulation mode, can realize with the unity power factor electric energy transmitting, it is in 12% that total harmonic distortion can be reduced to, but because power switch component works under the hard switching mode significant disadvantages that can bring: the serious electromagnetic interference that too high voltage build-up rate, current-rising-rate can produce; The voltage and current spike that produces because of turn-on and turn-off moments exceeds the reliability service that safety operation area SOA influences switch; And switching loss is bigger.Because soft switch pulse width modulation rectifier can be realized the soft switch motion with unity power factor electric energy transmitting and power switch component simultaneously, become the main mode that solves problems such as suppressing harmonic pollution and electromagnetic interference.

At present in power-converting device, about soft switch pulsewidth modulation power converter has various topological structures and control strategy, for no-voltage DC link converter, realize the resonance location difference according to it, can roughly be divided into two classes: DC link mode of resonance system and utmost point mode of resonance system.

A kind of is prior art resonance DC link type system, constitute resonant circuit by the resonant inductance that is connected in parallel on the dc bus with the buffer capacitor that is connected in parallel on the power switch component, make DC bus-bar voltage periodically reduce to zero, power switch component just can move under its both end voltage is zero situation, this kinds of structures is simple relatively, but has reduced the utilance of busbar voltage.

Other has a kind of is prior art utmost point mode of resonance system, constitute the auxiliary resonance circuit by the resonant inductance that is connected in parallel on the brachium pontis input with the buffer capacitor that is connected in parallel on the power switch, make the brachium pontis input terminal voltage periodically reduce to zero or be upgraded to busbar voltage, power switch component also can move under the no-voltage situation.In utmost point resonant converter, auxiliary resonant polar form rectifier has and transmits advantages such as voltage, current stress that electric energy efficiency height, power device and fly-wheel diode bear are low, but for traditional auxiliary resonant polar form three-phase pulse width modulated rectifier, each brachium pontis all is furnished with one group of auxiliary resonance circuit, the auxiliary resonance link just is made up of six auxiliary switch element, three resonant inductances, six diodes like this, complex structure, the manufacturing cost height.

Summary of the invention

The object of the present invention is to provide a kind of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier, circuit structure is simplified, adopted the PWM mode of switch least number of times, resonance is normally carried out, realize power switch component action under the zero voltage condition, and make that the network system transmission efficiency improves, control is easy, loss is little.

Technical scheme of the present invention is:

A kind of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier comprises: by three series inductances, six power switch components, six buffer capacitors and six three phase full bridge circuit that parallel diode is formed; The input of described three phase full bridge circuit is connected with three-phase alternating-current supply respectively; It is characterized in that: also comprise a resonant circuit, this resonant circuit is connected with the three phase full bridge circuit; Described resonant circuit is made up of two auxiliary switch element, three groups of diode assemblies, two dividing potential drop electric capacity and a resonant inductance; Three groups of diode assemblies in parallel between the emitter of the collector electrode of first auxiliary switch element and second auxiliary switch element; Be connected with an end of resonant inductance at the emitter of first auxiliary switch element and the collector electrode of second auxiliary switch element, the other end of this resonant inductance is connected with the negative terminal of first dividing potential drop electric capacity and the anode of second dividing potential drop electric capacity; The anode of first dividing potential drop electric capacity is connected with the load two ends respectively with the negative terminal of second dividing potential drop electric capacity.

Three groups of above-mentioned diode assemblies are made up of three common cathode diodes and three co-anode diodes.

Three groups of above-mentioned diode assemblies, wherein, first group of diode assembly is connected with the negative terminal of first co-anode diode by the anode of first common cathode diode; Second group of diode assembly is connected with the negative terminal of second co-anode diode by the anode of second common cathode diode; The 3rd group of diode assembly is connected with the negative terminal of the 3rd co-anode diode by the anode of the 3rd common cathode diode; The negative terminal of three common cathode diodes is connected with the collector electrode of first auxiliary switch element; Three co-anode diode anodes are connected with the emitter of second auxiliary switch element.

A diode in parallel and an electric capacity respectively between the emitter of six power switch components of above-mentioned three phase full bridge circuit and the collector electrode, first, second end with the 3rd series inductance be connected with three-phase alternating-current supply respectively; The link of the link of the other end of first series inductance and the anode of first diode and the negative electrode of the 4th diode and first group of diode assembly of resonant circuit is connected, the link of second group of diode assembly of the anode of the other end of second series inductance and second diode and the cathode connection terminal of the 5th diode and resonant circuit is connected, and the link of the 3rd group of diode assembly of the anode of the other end of the 3rd series inductance and the 3rd diode and the cathode connection terminal of the 6th diode and resonant circuit is connected.

The computing formula of the three-phase voltage that modulation generates in the above-mentioned three phase full bridge circuit is as follows:

u _R(t)＝M?sin(ωt-θ ₀)

$u_S\left(t\right)=M\sin (\mathrm{\ωt}-{\mathrm{\θ}}_0-\frac{2\mathrm{\π}}{3})$

$u_T\left(t\right)=M\sin (\mathrm{\ωt}-{\mathrm{\θ}}_0-\frac{4\mathrm{\π}}{3})$

In the following formula, M is a modulation depth, θ ₀Be phase voltage u _RThe deviation angle of the phase voltage of hysteresis phase power supply.

Auxiliary resonant polar form rectifier of the present invention makes it compared with prior art owing to adopted above-mentioned technical scheme, has following advantage and good effect:

1, the present invention is owing to be provided with the comparatively simple resonant circuit of circuit structure, be on based on a facies-controlled basis, adopted the pulse width modulation controlled of switch least number of times, produce the mode of operation of no-voltage resonance, so not only guaranteed can resonance normally carry out, and make the efficient of system improve, control is easy.Through simulating, verifying, this rectifier can satisfy under the unity power factor ruuning situation, realizes power switch component action under the zero voltage condition.

2, the present invention crosses by providing energy to load in three-phase alternating current Netcom, can accomplish that not only power factor is one, the basic reactive power loss of eliminating, current waveform is near sinusoidal, also eliminated the harmonic pollution to electrical network, direct voltage is adjustable, greatly improves the power supply quality, improve power consumption efficiency, saves energy.

3, the present invention compares with conventional hard switching pulse width modulation rectifier, when soft switch pulse width modulation rectifier can suppress because of the turn-on and turn-off device for power switching, and too high voltage build-up rate, the serious electromagnetic interference that current-rising-rate produced; Avoid exceeding the reliability service that safety operation area SOA influences switch because of the voltage and current spike of turn-on and turn-off moment generation; Switching loss reduces greatly.

Description of drawings

By the description of a following embodiment to auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier of the present invention, can further understand purpose of the present invention, specific structural features and advantage in conjunction with its accompanying drawing.Wherein, accompanying drawing is:

Fig. 1 is the circuit theory diagrams of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier of the present invention.

Fig. 2 is the PWM mode oscillogram of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier of the present invention.

Fig. 3 is the working waveform figure of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier circuit of the present invention.。

Fig. 4 is the circuit diagram of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier pattern A of the present invention.

Fig. 5 is the circuit diagram of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier pattern B of the present invention.

Fig. 6 is the circuit diagram of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier pattern C of the present invention.

Fig. 7 is the circuit diagram of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier pattern D of the present invention.

Fig. 8 is the circuit diagram of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier pattern E of the present invention.

Fig. 9 is the circuit diagram of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier pattern F of the present invention.

Figure 10 is the circuit diagram of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier pattern G of the present invention.

Figure 11 is the circuit diagram of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier pattern H of the present invention.

Figure 12 is the circuit diagram of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier pattern I of the present invention.

Figure 13 is the simplification equivalent resonant circuit figure of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier of the present invention.

Figure 14 is that auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier of the present invention is applied in the theory diagram in the control system.

Figure 15 is the R phase voltage of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier of the present invention and the simulation waveform figure of phase current.

Figure 16 is the simulation waveform figure of the resonance action of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier of the present invention.

Embodiment

See also shown in Figure 1ly, auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier comprises: three phase full bridge circuit 1, resonant circuit 2; Three phase full bridge circuit 1 is by series inductance L _R, L _S, L _T, power switch component V ₁～V ₆, buffer capacitor C ₁～C ₆And parallel diode D ₁To D ₆Form; Described inductance L _R, L _S, L _TAn end respectively with the e of three-phase alternating-current supply _R, e _SAnd e _TConnect; At each power switch component V ₁To V ₆Emitter and collector electrode between parallel diode D respectively ₁And capacitor C ₁, diode D ₂And capacitor C ₂, diode D ₃And capacitor C ₃, diode D ₄And capacitor C ₄, diode D ₅And capacitor C ₅, diode D ₆And capacitor C ₆, series inductance L _RThe other end and D ₁Emitter and D ₄Collector electrode and meet the end and the D of resonant circuit _A1With D _B1The series side connect inductance L _SThe other end and D ₂Emitter and D ₅Collector electrode and meet the end and the D of resonant circuit _A2With D _B2The series side connect inductance L _TThe other end and D ₃Emitter and D ₆Collector electrode and meet the end and the D of resonant circuit _A3With D _B3The series side connect.

Resonant circuit 2 is by auxiliary switch element V _AAnd V _B, several diode assemblies, dividing potential drop capacitor C _D1, C _D2And resonant inductance L _rForm; At auxiliary switch element V _ACollector electrode and V _BEmitter with between in parallel several the group diode assemblies; Several group diode assemblies are made up of three groups of diode assemblies; These three groups of diode assemblies comprise diode D _A1～D _A3, D _B1～D _B3Wherein, first group of diode assembly is by D _A1Anode and D _B1Negative terminal connect to form; Second group of diode assembly is by D _A2Anode and D _B2Negative terminal connect to form; The 3rd group of diode assembly is by D _A3Anode and D _B3Negative terminal connect to form; Diode D _A1～D _A3Negative terminal and auxiliary switch element V _ACollector electrode connect; Diode D _B1～D _B3Anode and auxiliary switch element V _BEmitter connect; At auxiliary switch element V _AEmitter and V _BCollector electrode and resonant inductance L _rAn end connect resonant inductance L _rThe other end and dividing potential drop capacitor C _D1Negative terminal and C _D2Anode connect; The dividing potential drop capacitor C _D1, C _D2Positive and negative terminal be connected with the load two ends.The direct voltage of setting in the load among Fig. 1 is E _d, use E respectively _d/ 2 expression C _D1, C _D2On dividing potential drop, u _R, u _SAnd u _TBe respectively the voltage of the first-harmonic composition that R, S and T generated through the pulsewidth modulation.

Further specify the pulse width modulation controlled mode of this rectifier below.

Be convenient to realize that with unity power factor to the load electric energy transmitting, phase voltage and phase current remain synchronous operation, this rectifier has adopted width of cloth phase control mode, and following voltage u is arranged like this _R, u _SAnd u _TComputing formula is set up:

u _R(t)＝M?sin(ωt-θ ₀)

$u_S\left(t\right)=M\sin (\mathrm{\ωt}-{\mathrm{\θ}}_0-\frac{2\mathrm{\π}}{3})$

$u_T\left(t\right)=M\sin (\mathrm{\ωt}-{\mathrm{\θ}}_0-\frac{4\mathrm{\π}}{3})---\left(1\right)$

In the formula, M is a modulation depth, θ ₀Be phase voltage u _RHysteresis phase voltage e _RDeviation angle.

See also shown in Figure 2, e in Fig. 2 _R, e _SAnd e _TBe three-phase alternating-current supply, u _R, u _SAnd u _TBe respectively the voltage of the first-harmonic composition that R, S and T generated through the pulsewidth modulation, i _R, i _SAnd i _TBe respectively the phase current of the three-phase of power supply, u ' _R, u ' _SAnd u ' _TBe respectively the modulation wave signal of three-phase, G ₁～G ₆, G _AAnd G _BBe respectively power switch component V ₁～V ₆, auxiliary switch element V _AAnd V _BGate electrode drive signals.

All be parallel with buffer capacitor in the three phase full bridge circuit on each power switch component, then it turn-offs that at any time to carry out all must be the no-voltage mode, therefore is in no-voltage constantly as long as consider that it is opened.During for ease of generation resonance, power switch component V ₁To V ₆Open and constantly concentrate in together, adopted sawtooth waveforms that positive negative slope replaces among Fig. 2 as carrier wave.For ease of analyzing, the sense of current adopted the negative slope sawtooth waveforms for just when rated current flowed into brachium pontis here, otherwise was negative when electric current flows out brachium pontis, adopted the positive slope sawtooth waveforms.

For guaranteeing the work of auxiliary resonance change of current link, adopted the pulse-width modulation modulating mode of switch least number of times here.As can be known from Fig. 2, in one-period [0,2 π], different according to a certain phase current direction and other biphase current direction can mark off 6 intervals.In a certain interval, because this phase current is by diode connected in parallel circulation on the power switch component, two of this phase place power switch components all can be in the disconnected state of complete shut-down so, and so just can save and open number of times is original 1/3.These control strategies make that system's control is more simple and easy to do.

Modulation wave signal u ' R, u ' S and u ' T are generated by voltage uR, uS and uT, and according to top 6 intervals dividing, convolution (1) can be derived following expression

Interval 1:

${u\′}_R\left(t\right)=u_R\left(t\right)-u_S\left(t\right)-1=\sqrt{3}M\cos (\mathrm{\ωt}-{\mathrm{\θ}}_0-\frac{\mathrm{\π}}{3})-1$ 　 u′s(t)＝-1

${u\′}_T\left(t\right)=u_T\left(t\right)-u_S\left(t\right)-1=\sqrt{3}M\cos (\mathrm{\ωt}-{\mathrm{\θ}}_0)-1$

Interval 2:

u′R(t)＝+1

${u\′}_S\left(t\right)=u_S\left(t\right)-u_R\left(t\right)+1=-\sqrt{3}M\cos (\mathrm{\ωt}-{\mathrm{\θ}}_0-\frac{\mathrm{\π}}{3})+1$

${u\′}_T\left(t\right)=u_T\left(t\right)-u_R\left(t\right)+1=-\sqrt{3}M\cos (\mathrm{\ωt}-{\mathrm{\θ}}_0-\frac{2\mathrm{\π}}{3})+1$

Interval 3:

${u\′}_R\left(t\right)=u_R\left(t\right)-u_T\left(t\right)-1=\sqrt{3}M\cos (\mathrm{\ωt}-{\mathrm{\θ}}_0-\frac{2\mathrm{\π}}{3})-1$

${u\′}_S\left(t\right)=u_S\left(t\right)-u_T\left(t\right)-1=-\sqrt{3}M\cos (\mathrm{\ωt}-{\mathrm{\θ}}_0)-1$

u′T(t)＝-1

Interval 4:

${u\′}_R\left(t\right)=u_R\left(t\right)-u_S\left(t\right)+1=\sqrt{3}M\cos (\mathrm{\ωt}-{\mathrm{\θ}}_0-\frac{\mathrm{\π}}{3})+1$

u′s(t)＝+1

${u\′}_T\left(t\right)=u_T\left(t\right)-u_S\left(t\right)+1=\sqrt{3}M\cos (\mathrm{\ωt}-{\mathrm{\θ}}_0)+1$

Interval 5:

u′R(t)＝-1

${u\′}_S\left(t\right)=u_S\left(t\right)-u_R\left(t\right)-1=-\sqrt{3}M\cos (\mathrm{\ωt}-{\mathrm{\θ}}_0-\frac{\mathrm{\π}}{3})-1$

${u\′}_T\left(t\right)=u_T\left(t\right)-u_R\left(t\right)-1=-\sqrt{3}M\cos (\mathrm{\ωt}-{\mathrm{\θ}}_0-\frac{2\mathrm{\π}}{3})-1$

Interval 6:

${u\′}_R\left(t\right)=u_R\left(t\right)-u_T\left(t\right)+1=\sqrt{3}M\cos (\mathrm{\ωt}-{\mathrm{\θ}}_0-\frac{2\mathrm{\π}}{3})+1$

${u\′}_S\left(t\right)=u_S\left(t\right)-u_T\left(t\right)+1=-\sqrt{3}M\cos (\mathrm{\ωt}-{\mathrm{\θ}}_0)+1$

u′T(t)＝+1(2)

According to above analysis as can be known, compare with the sawtooth carrier wave that positive negative slope replaces, just can obtain among Fig. 2 the gate electrode drive signals G of each power switch component in the full-bridge circuit when modulating wave ₁～G ₆

Auxiliary resonance change of current link in the resonant circuit is performed such work: in 6 intervals in Fig. 2, when certain phase current direction for negative, and other biphase current direction is timing, makes power switch component G in the resonant circuit _AResonance takes place in action; Otherwise, when this phase current for just, and other biphase current direction makes power switch component G in the resonant circuit when negative _BAction.Because phase current direction difference, this auxiliary resonant polar form circuit equally also has two kinds of type of action, below a kind of power switch component G wherein just only _AThe type of action of action is further analyzed.

With interval 1 among Fig. 2 is that example describes, and the direction of three-phase current is always i _S0, i _R0, i _T＜0, two power switch component V on the brachium pontis of T phase place so ₂And V ₅Turn-off brachium pontis power switch component V on R, the S phase place always ₁And V ₂Turn-off always, have only following brachium pontis power switch component V ₄, V ₆With auxiliary switch element V _AMove.

See also shown in Figure 3ly, Fig. 3 is the action waveforms of each pattern of auxiliary resonant polar form circuit, in Fig. 3, and t in a carrier cycle ₁～t ₀U _A, three-phase modulation wave signal u ' _R, u ' _SAnd u ' _T, G _A, G _V4, G _V6, I _S, I _LR, U _RN, I _V4, U _TN, I _N6Action waveforms.

See also Fig. 4 to shown in Figure 12, in a carrier cycle, being divided into according to the switch motion of rectifier is 9 mode of operations, because the carrier frequency of rectifier is far above mains frequency, can think that in a carrier cycle input current of rectifier is constant, represent with constant-current source.Equally, because capacitor C _D1And C _D2Very big, can think that also its both end voltage is constant substantially, thereby use voltage source E _d/ 2 equivalences.

The circuit theory of 9 mode of operations of auxiliary resonant polar form circuit resonance action is:

See also shown in Figure 4, pattern a:(～t ₁) during stable state, diode D ₁, D ₂, D ₃The nature afterflow is by three phase mains and series inductance L _R, L _S, L _TProvide electric energy to load.

See also shown in Figure 5, pattern b (V _AConducting): (t ₁～t ₂) at t ₂Constantly allow V _AConducting then is applied with E on the inductance L r _d/ 2 voltages, L _rOn current i _LrIncrease gradually, obviously V _AWith zero current passing.Work as i _Lr=i _DA1+ i _DA3〉=i _R+ i _T(=| i _S|) time, diode D ₁, D ₃End.

See also shown in Figure 6, pattern c (generation resonance): (t ₂～t ₃) L _rGo up electric capacity generation resonance mutually with R, T.C is arranged at R on mutually ₁Charging, C ₄Discharge has C at T on mutually ₃Charging, C ₆Discharge is along with progressively weakening of discharge capability, i _LrExperienced elder generation and progressively increased, after the process that reduces gradually, work as C ₄, C ₆When discharge finished, its both end voltage equated to be zero.

See also shown in Figure 7, pattern d (V ₄, V ₅Conducting): (t ₃～t ₄) at t=t ₃Constantly, u _RN, u _TNBe reduced to zero, i _Lr=| i _S|, open V ₄, V ₆, be no-voltage, zero current passing this moment.

The inductance both end voltage is E _d/ 2, to power supply E _d/ 2 shift energy, electric current, i _LrReduce gradually.Simultaneously, i _V4, i _V6Beginning increases, and three phase mains is to series inductance L _R, L _S, L _TEnergy is provided.Thereby current relationship is arranged

|i _S|＝i _R+i _T＝(i _V4+i _DA1)+(i _V4+i _DA3)

＝(i _V4+i _V4)+i _Lr

Because i _SConstant, when | i _S|=i _R+ i _T=i _V4+ i _V6The time, i _Lr=0.

See also shown in Figure 8, pattern e (V _ATurn-off): (t ₄～t ₅) i _LrContinue to be decreased to direction and overturn, because diode D _A1, D _A3Oppositely end i _LrElectric current still is zero, turn-offs V this moment _A, be obviously at zero-current switching.

See also shown in Figure 9, pattern f (V ₄Turn-off): (t ₅～t ₆) because capacitor C ₄Both end voltage is zero, and the electric capacity both end voltage can not suddenly change, and can turn-off V this moment under no-voltage ₄At this moment i _V4Be reduced to zero, C ₄Begin charging, C ₁Discharge.

See also shown in Figure 10, pattern g (D ₁Conducting): (t ₆～t ₇) at t ₆Constantly, uX is increased to E _d, C ₁Both end voltage is zero, and this moment is by R, S phase power supply and series inductance L _R, L _SProvide electric energy to load, forward voltage makes diode D ₁Conducting.

See also shown in Figure 11, pattern h (V ₆Turn-off): (t ₇～t ₈) common mode f analysis classes seemingly,

Can under no-voltage, turn-off V ₆, i _V6Be reduced to zero, C ₆Begin charging, C ₃Discharge.

See also shown in Figure 12, pattern i (D ₃Conducting): (t ₈～t ₀) common mode g analysis classes seemingly, diode D ₃Conducting.This moment is by diode D ₁, D ₂, D ₃The nature afterflow, three phase mains and series inductance L _R, L _S, L _TProvide electric energy to load, get back to pattern a.

Seeing also shown in Figure 13ly, is the simplification equivalent resonant circuit figure of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier of the present invention.According to during mode of resonance c takes place, with resonant circuit progressively simplify, equivalence.

Below to above-mentioned auxiliary resonant polar form circuit resonance action mode of operation b (t ₁～t ₂), pattern c (t ₂～t ₃) auxiliary switch element V _AAction resonance mathematical analysis constantly:

Pattern b (t ₁～t ₂) mathematical analysis

If inductance L _rInductance value be L _r, initial condition: i _Lr(t ₁)=0, u _Lr=E _d/ 2, thus voltage relationship is arranged

$L_r\frac{{\mathrm{di}}_{\mathrm{Lr}}}{\mathrm{dt}}=\frac{{\mathrm{<figure-callout\; id="2"\; label="E\; d"\; filenames="C200410066758E00171.png,C200410066758E00172.png"\; state="\{\{state\}\}">E</figure-callout>}}_d}{2}$

Can obtain

$i_{\mathrm{Lr}}\left(t\right)=\frac{E_d}{{2L}_r}(t-t_1)$

At t=t ₂Constantly, i _Lr(t ₂)=| i _S|, promptly

$i_{\mathrm{Lr}}\left(t_2\right)=\frac{E_d}{2L_r}(t_2-t_1)=\left|i_S\right|$

Thereby have

$\mathrm{\&Delta;}{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="C200410066758E00171.png,C200410066758E00172.png"\; state="\{\{state\}\}">t</figure-callout>}}_2=t_2-{\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="C200410066758E00172.png,C200410066758E00221.png"\; state="\{\{state\}\}">t</figure-callout>}}_1=\frac{{2L}_r\left|i_S\right|}{E_d}---\left(3\right)$

Pattern c (t ₂～t ₃) mathematical analysis

According to Figure 13, Figure 13 d after the simplification equivalence, establishing each capacitance is C _r, initial condition: u _C4(t ₂)=u _C6(t ₂)=E _d, i.e. U _C4(S)=U _C6(S)=E _d/ S, resonance current i _r(t ₂)=0.In Figure 13 d, can obtain following equation

$\frac{1}{4{\mathrm{SC}}_r}{I}_r\left(S\right)+{\mathrm{SL}}_r{I}_r\left(S\right)=\frac{E_d}{2S}$

Find the solution

$I_r\left(S\right)=E_d\sqrt{\frac{C_r}{L_r}}\frac{{\mathrm{\&omega;}}_{\mathrm{<figure-callout\; id="2"\; label="r\; S"\; filenames="C200410066758E00171.png,C200410066758E00172.png"\; state="\{\{state\}\}">r</figure-callout>}}}{S^{}},$ Wherein ${{\mathrm{\&omega;}}_{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="C200410066758E00171.png,C200410066758E00172.png"\; state="\{\{state\}\}">r</figure-callout>}}}^2=\frac{1}{4L_r{C}_r}---\left(4\right)$

Then have

$i_r(t-t_2)=E_d\sqrt{\frac{C_r}{L_r}}\sin {\mathrm{\&omega;}}_r(t-t_2)---\left(5\right)$

Work as t=t ' constantly, i _rWhen reaching maximum,, and make levoform to formula (5) differentiate

$\frac{{\mathrm{di}}_r(t-t_2)}{d(t-t_2)}=0,$ Cos ω is arranged _r(t-t ₂)=0

Can try to achieve

$\mathrm{\&Delta;t}\&prime;=t-{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="C200410066758E00171.png,C200410066758E00172.png"\; state="\{\{state\}\}">t</figure-callout>}}_2=\frac{\mathrm{\&pi;}}{2{\mathrm{\&omega;}}_r}=\mathrm{\&pi;}\sqrt{L_r{C}_r}---\left(6\right)$

In Figure 13 a, capacitor C ₄, C ₅Both end voltage is

$U_{C4}\left(S\right)=U_{C5}\left(S\right)=\frac{E_d}{S}-{\mathrm{SL}}_r{I}_r\left(S\right)-\frac{E_d}{2S}$

With formula (4) substitution following formula, have

$U_{C4}\left(S\right)=U_{C5}\left(S\right)=\frac{E_d}{2S}-\frac{E_d}{2}\frac{\mathrm{<figure-callout\; id="2"\; label="S\; S"\; filenames="C200410066758E00171.png,C200410066758E00172.png"\; state="\{\{state\}\}">S</figure-callout>}}{S^{}}$

Solve

$u_{C4}(t-t_2)=u_{C5}(t-t_2)=\frac{E_d}{2}[1-\cos {\mathrm{\&omega;}}_r(t-t_2)]---\left(7\right)$

With formula (6) substitution following formula, i.e. i _rWhen reaching maximum, C ₄(C ₆) both end voltage is

$u_{C4}(\mathrm{\&Delta;t}\&prime;)=u_{C5}(\mathrm{\&Delta;t}\&prime;)=\frac{E_d}{2}---\left(8\right)$

Work as C ₄(C ₆) discharge until t=t ₃Constantly, when its both end voltage is zero, make formula (7) equal zero, can get cos ω _r(t ₃-t ₂)=1

${\mathrm{\&Delta;<figure-callout\; id="3"\; label="t"\; filenames="C200410066758E00172.png"\; state="\{\{state\}\}">t</figure-callout>}}_3=t_3-{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="C200410066758E00171.png,C200410066758E00172.png"\; state="\{\{state\}\}">t</figure-callout>}}_2=\frac{\mathrm{\&pi;}}{{\mathrm{\&omega;}}_r}=2\mathrm{\&pi;}\sqrt{L_r{C}_t}---\left(9\right)$

Bring formula (9) into formula (5), promptly at t=t ₃Constantly, resonance current i _rFor

i _r(Δt ₃)＝i _r(t ₃-t ₂)＝0　　(10)

The above results is pointed out, please cooperate referring to shown in Figure 3, when iLr reaches maximum, C4 (C6) both end voltage drops to Ed/2 by Ed, this be because, as uC4 (uC6)〉during Ed/2, bear the voltage of (uC4-Ed/2〉0) on the Lr, therefore iLr is continued to increase by (iLr=iLr (t2)+ir (t-t2)=iS+ir (t-t2)), and the energy of the last savings of Lr continues to increase.When uC4 (uC6)=Ed/2, the applied voltage that bears on the Lr is zero, and iLr stops to increase, and has promptly reached maximum.Along with C ₄(C ₆) discharge, u _C4(u _C6) progressively descend.Work as u _C4(u _C6)＜E _d/ 2 o'clock, L _rOn the applied voltage that bears in the other direction, so L _rLast back electromotive force L _rDi _Lr/ dt adjusts direction, i _LrReduce L gradually _rThe energy that the energy that discharges should equal to increase is previously worked as t=t ₃Constantly, i _Lr=i _Lr(t ₂)+i _r(t-t ₂)=i _S

Auxiliary switch element V _AAction constantly, for ease of analyzing, adopt positive slope sawtooth carrier wave and reference voltage comparison, u among Fig. 3 _ASize determined V _AConducting constantly, when resonance promptly takes place.As shown in Figure 3, V _AConducting occur in before the vertical edge of sawtooth waveforms i.e. t constantly ₁Constantly, by above to mode of operation b (t ₁～t ₂), pattern c (t ₂～t ₃) analysis as can be known, the Timing Advance of this section should be (△ t ₂+ △ t ₃).

Because be the bipolarity modulation, establishing carrier cycle is T _c, reference voltage u so _ACan find the solution as follows

$\frac{u_A+1}{2}=\frac{T_C-({\mathrm{\&Delta;<figure-callout\; id="2"\; label="t"\; filenames="C200410066758E00171.png,C200410066758E00172.png"\; state="\{\{state\}\}">t</figure-callout>}}_2+{\mathrm{\&Delta;t}}_3)}{T_c}$

Promptly have $u_A=1-\frac{2({\mathrm{\&Delta;<figure-callout\; id="2"\; label="t"\; filenames="C200410066758E00171.png,C200410066758E00172.png"\; state="\{\{state\}\}">t</figure-callout>}}_2+{\mathrm{\&Delta;t}}_3)}{T_C}$

With formula (3) and (9) substitution following formula, can get

u _A＝XI+Y　　(11)

In the formula,

$X=-\frac{4L_r}{T_c{E}_d}$ 　 $Y=1-\frac{4\mathrm{\&pi;}\sqrt{L_r{C}_r}}{T_c}$

I＝|i _S|

By formula (11) as can be known, V _AConducting constantly should be along with current i _SVariation and change, can follow the tracks of the fluctuation of load.And V _AShutoff constantly should be after the vertical edge of sawtooth waveforms, needed time of delay should be greater than (t ₄-t ₃≈ △ t ₃).

For reference voltage u in all intervals among Fig. 2 _AOr u _BFind the solution, can adopt positive slope sawtooth carrier wave equally, formula (11) also is applicable to all intervals among Fig. 2, the value of different is reference current I has following change

Interval 1 and 4, I=|i _S|

Interval 2 and 5, I=|i _R|

Interval 3 and 6, I=|i _T|

In above this type of action, auxiliary switch element V _ADuring action, resonance makes the brachium pontis input terminal voltage periodically reduce to zero, under manage auxiliary switch element V _BConducting zero voltage condition is provided, realize the soft switch motion of power switch component, and in another kind of type of action, i.e. auxiliary switch element V _BAction is with auxiliary switch element V _AOperating principle is identical, and resonance makes the brachium pontis input terminal voltage periodically be increased to busbar voltage E _d, be similarly pipe auxiliary switch element V _AConducting zero voltage condition is provided, in this omission.

Seeing also shown in Figure 14ly, is that auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier of the present invention is applied in the theory diagram in the control system.This control system comprises auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier 10, microprocessor 20, signal deteching circuit 30, gate drive circuit 40; The input of microprocessor 20 is connected with the output of signal deteching circuit 30, the output of microprocessor 20 is connected with the input of gate drive circuit 40, three phase full bridge circuit 1 input of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier 10 is connected with the input of signal deteching circuit 30, gate drive circuit 40 is connected with the gate pole of the power switch component of the three phase full bridge circuit of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier 10 respectively by lead, and the gate pole of the power switch component of the resonant circuit of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier 10 connects.

The operation principle of this control system is that on the one hand, signal deteching circuit is by detection line voltage e _STWith phase current i _RSignal is sent into computer processor and is carried out computing, to after its phase discrimination processing, obtains power-factor angle again Be converted to pilot angle θ ₀Offset θ ₀, send into phase angle control pi regulator, controlled angle θ ₀Signal deteching circuit is by detecting direct voltage E _d, send into computer processor and carry out computing, be converted to the offset M of modulation depth, send into the voltage control pi regulator, obtain modulation depth M.Can try to achieve each interval modulation wave signal according to above-mentioned formula (2) again, carry out the pulse-width modulation computing through computer processor, try to achieve the gate electrode drive signals of each device for power switching in the full-bridge circuit, send into gate drive circuit, gate electrode drive signals is imported six power switch components in the full-bridge circuit of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier by gate drive circuit again, realized control six power switch components in the full-bridge circuit.

On the other hand, signal deteching circuit is sent into computer processor and is carried out computing by detecting three-phase current signal, not only can obtain three-phase current polarity, so just can determine to adopt plus or minus slope sawtooth carrier wave and modulation wave signal relatively, produce pulse width modulated drive signal; And can obtain phase current magnitude, can try to achieve the drive signal of the auxiliary switch element of resonant circuit again according to formula (11), send into gate drive circuit, by gate drive circuit gate electrode drive signals is imported the auxiliary switch element of the resonant circuit of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier again, realize control two power switch components in the resonant circuit.

In the electric control system owing to used resonant reversion pole type three phase voltage pulse width modulation rectifier of the present invention, under width of cloth phase control mode, realizing control to the power switch component of resonant reversion pole type three phase voltage pulse width modulation rectifier, thus keep the power factor of system be 1 and constant DC press E _dGuarantee auxiliary resonance polar form circuit operate as normal, make the power switch component of resonant reversion pole type three phase voltage pulse width modulation rectifier work in the zero voltage switch state.

Seeing also shown in Figure 15ly, is the simulation waveform figure of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier of the present invention.

In conjunction with Fig. 1, the system emulation parameter is: carrier frequency is 3.33kHz, and the input phase voltage is 110V, and output dc voltage is 250V, and load is 1.5kW, series inductance L=7mH, dividing potential drop capacitor C _D1=C _D2=1100 μ F, buffer capacitor C _r=8nF, resonant inductance L _r=14 μ H.

Upper curve is that R phase voltage waveform, lower curve are the R phase current waveform among Figure 15;

Figure 16 is respectively auxiliary switch element V from top to bottom _ATriggering signal, resonance current i _LrWaveform, resonance potential u _RNWaveform and power switch component V ₄Triggering signal.

As can be seen, simulation result is that system has kept the unity power factor operation from Figure 15 and Figure 16, and the simulation result of resonance is consistent with Analysis of Transient among Fig. 3 simultaneously.

The present invention can be used on three-phase and realizes High Power Factor, the occasion that direct voltage is adjustable.Such as: be used for various AC-DC-AC alternating current machine drive systems, particularly high-voltage large-capacity motor transmission system, more can demonstrate its superiority.It meets the energy-conserving and environment-protective requirement of country, can eliminate reactive power loss basically, has realized " green power supply " simultaneously, has certain potential social benefit.Country was to household electrical appliance, as air conditioner industry having been formulated power factor correction PFC (power factor that promptly realizes single phase poaer supply is) convertible frequency air-conditioner standard in 2003.Along with the extensive use of China industrialized development, particularly frequency converter with to the exploitation of new forms of energy, this patent meets this growing trend, has wide prospect in industrial application and potential market, can bring considerable economic.

In sum, auxiliary resonant polar form three-phase pulse width modulated rectifier and working mechanism thereof, control strategy, mode of resonance have been done labor, and provided the simulation study result, simulation study is consistent with the mathematical analysis result.

Rectifier of the present invention has overcome the shortcoming of traditional auxiliary resonant polar form system architecture complexity, and has kept this The high efficiency advantage of type system, its circuit topology is simple, adopts element few, and cost is low; The peak value of converter circuit Electric current is little, uses the few pulsewidth v modulating mode of on-off times, the efficient of system is improved, and be convenient to control.

Claims (5)

1, a kind of auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier comprises: by three series inductance (L _R, L _S, L _T), six power switch component (V ₁～V ₆), six buffer capacitor (C ₁～C ₆) and six parallel diode (D ₁～D ₆) the three phase full bridge circuit formed; The input of described three phase full bridge circuit respectively with three-phase alternating-current supply (e _R, e _S, e _T) connect; It is characterized in that: also comprise a resonant circuit, this resonant circuit is connected with the three phase full bridge circuit; Described resonant circuit is by two auxiliary switch element (V _A, V _B), three groups of diode assemblies, two dividing potential drop electric capacity (C _D1, C _D2) and a resonant inductance (L _r) form; At first auxiliary switch element (V _A) collector electrode and second auxiliary switch element (V _B) emitter between three groups of diode assemblies in parallel; At first auxiliary switch element (V _A) emitter and second auxiliary switch element (V _B) collector electrode and resonant inductance (L _r) an end connect this resonant inductance (L _r) the other end be connected with the negative terminal of first dividing potential drop electric capacity (Cd1) and the anode of second dividing potential drop electric capacity (Cd2); First dividing potential drop electric capacity (C _D1) anode and second dividing potential drop electric capacity (C _D2) negative terminal be connected with the load two ends respectively.

2, auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier according to claim 1 is characterized in that: described three groups of diode assemblies are by three common cathode diode (D _A1～D _A3) and three co-anode diode (D _B1～D _B3) form.

3, auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier according to claim 2 is characterized in that: described three groups of diode assemblies, wherein, first group of diode assembly is by first common cathode diode (D _A1) anode and first co-anode diode (D _B1) negative terminal connect; Second group of diode assembly is by second common cathode diode (D _A2) anode and second co-anode diode (D _B2) negative terminal connect; The 3rd group of diode assembly is by the 3rd common cathode diode (D _A3) anode and the 3rd co-anode diode (D _B3) negative terminal connect; Three common cathode diode (D _A1～D _A3) negative terminal and first auxiliary switch element (V _A) collector electrode connect; Three co-anode diode (D _B1～D _B3) anode and second auxiliary switch element (V _B) emitter connect.

4, auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier according to claim 1 is characterized in that: six power switch component (V of described three phase full bridge circuit ₁～V ₆) emitter and collector electrode between a diode (D in parallel respectively ₁～D ₆) and an electric capacity (C ₁～C ₆), first series inductance (L _R), second series inductance (L _S) and the 3rd series inductance (L _T) an end respectively with three-phase alternating-current supply (e _R, e _S, e _T) connect; First series inductance (L _R) the other end and first diode (D ₁) anode and the 4th diode (D ₄) the link of negative electrode and the link of first group of diode assembly of resonant circuit connect second series inductance (L _S) the other end and second diode (D ₂) anode and the 5th diode (D ₅) cathode connection terminal and the link of second group of diode assembly of resonant circuit connect the 3rd series inductance (L _T) the other end and the 3rd diode (D ₃) anode and the 6th diode (D ₆) cathode connection terminal and the link of the 3rd group of diode assembly of resonant circuit connect.

5, auxiliary resonant reversion pole type three phase voltage pulse width modulation rectifier according to claim 1 is characterized in that: the computing formula of the three-phase voltage that modulation generates in the described three phase full bridge circuit is as follows:

u _R(t)＝M?sin(ωt-θ ₀)

$u_S\left(t\right)=M\sin (\mathrm{\&omega;t}-{\mathrm{\&theta;}}_0-\frac{2\mathrm{\&pi;}}{3})$

$u_T\left(t\right)=M\sin (\mathrm{\&omega;t}-{\mathrm{\&theta;}}_0-\frac{4\mathrm{\&pi;}}{3})$

In the following formula, M is a modulation depth, θ ₀Be phase voltage u _RHysteresis phase power supply (e _R) the deviation angle of phase voltage.

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