CN102163924B - Current type impedance source AC/AC (alternating current/alternating current) frequency converter and control method of control loop thereof - Google Patents

Abstract

The invention provides a current type impedance source AC/AC (alternating current/alternating current) frequency converter, comprising an AC voltage source or AC load, an AC electric electronic switch, an impedance source network, an AC electric electronic switch matrix and an AC load or AC voltage source, wherein the AC electric electronic switch is connected in parallel between the impedance source network and the AC voltage source; the AC electric electronic switch matrix is connected between the impedance source network and the load; and the impedance source network is a symmetrical X-shaped network composed of an inductor and a capacitor. The invention further provides a logic control method of a control loop of the current type impedance source AC/AC frequency converter. The invention has the advantages of preventing the AC electric electronic switch matrix from damaging electric electronic components when the switch is conducted or cut off at the same state. The passive element value of the impedance source network is rather small; the voltage gain of the circuit is increased. The working frequency of the AC electric electronic switch is further higher than the power supply and the output voltage frequency; the circuit is high in reliability, simple in structure, small in size and light in weight.

Description

The control method of current mode source of resistance AC/AC frequency converter and control loop thereof

Technical field

The present invention relates to the AC/AC frequency converter, particularly the control method of a kind of current mode source of resistance AC/AC frequency converter and control loop thereof.

Background technology

Present frequency converter great majority are indirect type frequency converters, i.e. AC-DC-AC formula frequency converter, and its shortcoming is to have the intermediate dc link through over commutation and the conversion of inversion two stage power, and efficient is lower, and volume and weight is bigger.

Traditional AC/AC frequency converter is based on thyristor, adopts the phase control type control mode, and its shortcoming is the control circuit complexity, is easy to generate out of controlly, and the input side power factor is lower, and output voltage frequency can only be lower than the input voltage frequency.

Traditional AC/AC matrix converter adopts usually by 4 or 9 switch matrix that the bi-directional electric power electronic switch is formed, AC power and load are coupled, realize the function of direct transformation, frequency conversion simultaneously by the control algolithm of complexity, the input side power factor can reach close to 1, power stream can two-way flow, but has following shortcoming:

● the output voltage adjustable range is little, and voltage gain is less than 1;

● because the switching time of power electronic device or the influence of electromagnetic interference, the common-mode conducting is connected to the electronic power switch of the same phase of load if then can cause the short circuit of AC power, if the common-mode shutoff can cause the open circuit under the inductive load situation, thereby causes power electronic device to be damaged;

● the change of current difficulty of electronic power switch;

● the motor in the time of can't providing power cut-off when being used for the motor transmission is getted over ability;

● the EMI problem of circuit is serious.

People have carried out big quantity research, optimization to the circuit topology of conventional AC/interchange matrix converter in recent years, sparse type, sparse especially type matrix converter have appearred, but they are when having reduced number of switches, brought the more complicated of control, and aforesaid drawbacks does not obtain overcoming of essence, the scheme that has even also sacrificed the bidirectional power transmission characteristic of circuit.By the matrix converter topology of single-phase inverter module as bidirectional switch, though can realize two level, three level of output voltage, can realize the lifting/voltage reducing function, but control more complicated, used switching device number has increased by one times, and each module needs a capacitor respectively, and structure is also huger.

In recent years, proposed the matrix converter based on source of resistance thought both at home and abroad, but they all are the voltage-type circuit, do not see the report that current mode source of resistance frequency converter is arranged.

This case inventor has delivered paper in international conference IEEE ASEMD2009 in 2009, wherein relevant for the description of three-phase electricity flow pattern source of resistance matrix converter, but only provided its main circuit topology and analysis, its control device has not been described, also do not provided its control circuit.

Summary of the invention

The objective of the invention is to overcome above-mentioned defective, providing a kind of combines with the classical matrix current transformer based on the source of resistance converter, current mode source of resistance AC/AC frequency converter, can step-less adjustment output voltage amplitude and frequency, be damaged when avoiding bi-directional electric power electronic switch common-mode to turn-off simultaneously, circuit structure is simple, and volume is little, in light weight, reliability is high.

For achieving the above object, a kind of single-phase electricity flow pattern source of resistance AC/AC frequency converter provided by the invention, comprise the single phase alternating current (A.C.) voltage source that constitutes major loop, ac power electronic switch, ac power electronic switch matrix and AC load, and the current source inverter controller DSP or the FPGA that constitute control loop, described current source inverter controller DSP or FPGA are used for the nought state signal of output is connected to the drive circuit input of described ac power electronic switch, to control the conducting of described ac power electronic switch, described major loop also comprises a source of resistance network, control loop also comprises the logical circuit that links to each other with described current source inverter controller DSP or FPGA, wherein:

Described source of resistance network is by two inductance and two symmetry lattice networks that capacitor constitutes, described ac power electronic switch is parallel between described source of resistance network and the described alternating-current voltage source, described ac power electronic switch matrix is connected between described source of resistance network and the described AC load, and described ac power electronic switch matrix is formed by first ac power electronic switch to the, four ac power electronic switch arrays;

Described logical circuit comprises an ac power electronic switch control circuit and an ac power electronic switch matrix control circuit, described ac power electronic switch control circuit comprise first with the door, second with the door and first or, first output of current source inverter controller DSP or FPGA and second output be connected to first with the door input, the 3rd output of described current source inverter controller DSP or FPGA and the 4th output be connected to second with the door input, first is connected to first or the input of door, first or export the nought state signal with door and second with the output of door; The ac power electronic switch matrix control circuit comprise first not gate and the 3rd with Men Zhidi six and door, described nought state signal is connected to the input of first not gate, the output of first not gate be connected to respectively the 3rd with Men Zhidi six input with door, first output to the, four outputs of described current source inverter controller DSP or FPGA be connected to respectively the 3rd with Men Zhidi six another input with door, the 3rd with the output of Men Zhidi six and door source current each just, in the negative half period, output signal is connected to described first ac power electronic switch to the, four ac power electronic switches drive circuit input separately respectively in turn, to control the conducting of described ac power electronic switch matrix.

Single-phase electricity flow pattern source of resistance AC/AC frequency converter of the present invention, the bidirectional switch of wherein said ac power electronic switch for being constituted by 4 power diode bridges.

Single-phase electricity flow pattern source of resistance AC/AC frequency converter of the present invention, wherein said ac power electronic switch is a common collector insulated gate bipolar transistor IGBT bidirectional switch.

Single-phase electricity flow pattern source of resistance AC/AC frequency converter of the present invention, the output of wherein said alternating-current voltage source and the input of described ac power electronic switch are connected with inductor.

For achieving the above object, the logic control method in a kind of single-phase electricity flow pattern source of resistance AC/AC Frequency Converter Control provided by the invention loop, this method arranges ac power electronic switch control circuit and ac power electronic switch matrix control circuit, described ac power electronic switch control circuit comprise first with the door, second with the door and first or, the ac power electronic switch matrix control circuit comprise first not gate and the 3rd with Men Zhidi six and door, this method comprises:

(1) with first output to the, four outputs of current source inverter controller DSP or FPGA through first with door and second be connected to first or input, by first or door obtain the nought state signal, and the nought state signal of output is connected to the drive circuit input of described ac power electronic switch, to control the conducting of described ac power electronic switch;

(2) described nought state signal is connected to the input of first not gate, the output of first not gate be connected to respectively the 3rd with Men Zhidi six input with door, first output to the, four outputs of described current source inverter controller DSP or FPGA respectively corresponding be connected to the 3rd with Men Zhidi six another input with door, obtain 4 tunnel output signals with Men Zhidi six with door by the 3rd, and corresponding described first ac power electronic switch to the, the four ac power electronic switches drive circuit input separately that is connected to respectively, with source current each just, the conducting of the described ac power electronic switch matrix of control in the negative half period.

For achieving the above object, a kind of three-phase electricity flow pattern source of resistance AC/AC frequency converter provided by the invention, comprise the three-phase alternating current potential source that constitutes major loop, the three-phase ac power electronic switch, three-phase ac power electronic switch matrix and three-phase alternating current load, and the threephase switch space of matrices vector controller DSP or the FPGA that constitute control loop, described threephase switch space of matrices vector controller DSP or FPGA are used for the three-phase nought state signal of output is connected to the drive circuit input of described three-phase ac power electronic switch, to control the conducting of described ac power electronic switch, described major loop also comprises phase impedance source network and the clamped circuit of three-phase, control loop also comprises the logical circuit that links to each other with described switch matrix space vector controller DSP or FPGA, wherein:

Described phase impedance source network is by 3 inductance and 3 symmetry lattice networks that capacitor constitutes, described three-phase ac power electronic switch is parallel between described phase impedance source network and the described three-phase alternating current potential source, described three-phase ac power electronic switch matrix is connected between described phase impedance source network and the described three-phase alternating current load, described three-phase ac power electronic switch matrix is formed by first ac power electronic switch to the, nine ac power electronic switch arrays, and the clamped circuit of three-phase is connected between described three-phase ac power electronic switch matrix and the described three-phase alternating current load;

Described logical circuit comprises three-phase ac power electronic switch control circuit and three-phase ac power electronic switch matrix control circuit, described three-phase ac power electronic switch control circuit comprise the 7th with the door, the 8th with the door, the 9th with the door and second or, first output of described threephase switch space of matrices vector controller DSP or FPGA, second output and the 3rd output be connected to the 7th with the door input, the 4th output of described threephase switch space of matrices vector controller DSP or FPGA, the 5th output and the 6th output be connected to the 8th with the door input, the 7th output of described threephase switch space of matrices vector controller DSP or FPGA, the 8th output and the 9th output be connected to the 9th with the door input, the 7th with the door, the 8th with door and the 9th with the output of door be connected to second or the input of door, second or door export three-phase nought state signal; Three-phase ac power electronic switch matrix control circuit comprise second not gate and the tenth with Men Zhidi 18 and door, described three-phase nought state signal is connected to the input of second not gate, the output of second not gate be connected to respectively the tenth with Men Zhidi 18 input with door, first output to the, nine outputs of described threephase switch space of matrices vector controller DSP or FPGA respectively corresponding be connected to the tenth with Men Zhidi 18 another input with door, the tenth is connected to described first ac power electronic switch to the, nine ac power electronic switches drive circuit input separately respectively with the output of Men Zhidi 18 and door, to control the conducting of described three-phase ac power electronic switch matrix.

Three-phase electricity flow pattern source of resistance AC/AC frequency converter of the present invention, the bidirectional switch of wherein said three-phase ac power electronic switch for being made of 6 power diode bridges, described first ac power electronic switch to the, nine ac power electronic switches are respectively the bidirectional switch that is made of 4 power diode bridges.

Three-phase electricity flow pattern source of resistance AC/AC frequency converter of the present invention, the bidirectional switch of wherein said three-phase ac power electronic switch for being made of 6 power diode bridges, described first ac power electronic switch to the, nine ac power electronic switches are respectively common collector insulated gate bipolar transistor IGBT bidirectional switch.

Three-phase electricity flow pattern source of resistance AC/AC frequency converter of the present invention, the input of the output of wherein said three-phase alternating current potential source and described three-phase ac power electronic switch is connected with three-phase inductor.

For achieving the above object, the logic control method in a kind of three-phase electricity flow pattern source of resistance AC/AC Frequency Converter Control provided by the invention loop, this method arranges three-phase ac power electronic switch control circuit and three-phase ac power electronic switch matrix control circuit, described three-phase ac power electronic switch control circuit comprise the 7th with the door, the 8th with the door, the 9th with the door and second or the door, three-phase ac power electronic switch matrix control circuit comprise second not gate and the tenth with Men Zhidi 18 and door, this method comprises:

(1) first output to the, nine outputs of threephase switch space of matrices vector controller DSP or FPGA is connected to second or the input of door with door, the 9th with door with door, the 8th through the 7th, by second or door obtain three-phase nought state signal, and the three-phase nought state signal of output is connected to the drive circuit input of described three-phase ac power electronic switch, to control the conducting of described three-phase ac power electronic switch;

(2) described three-phase nought state signal is connected to the input of second not gate, the output of second not gate be connected to respectively the tenth with Men Zhidi 18 input with door, first output to the, nine outputs of described threephase switch space of matrices vector controller DSP or FPGA respectively corresponding be connected to the tenth with Men Zhidi 18 another input with door, obtain 9 tunnel output signals with Men Zhidi 18 with door by the tenth, and correspondence is connected to described first ac power electronic switch to the, nine ac power electronic switches drive circuit input separately respectively, to control the conducting of described three-phase ac power electronic switch matrix.

Advantage and the good effect of the control method of current mode source of resistance AC/AC frequency converter of the present invention and control loop thereof are: owing to be provided with source of resistance network and logic control circuit in the current mode source of resistance AC/AC frequency converter, circuit has extreme high reliability, damages power electronic device in the time of can avoiding in the ac power electronic switch matrix conducting of switch common-mode or common-mode to turn-off.Because the operating frequency of ac power electronic switch is far above the frequency of power supply and output voltage, the passive component value of source of resistance network is very little, entire circuit simple in structure, and volume is little, in light weight, reliability is high.The present invention also provides the logic control method of control loop, and this method is for the reliability that realizes foregoing circuit and avoid in the ac power electronic switch matrix conducting of switch common-mode or common-mode is damaged power electronic device when turn-offing and provided the foundation.

Be elaborated with reference to accompanying drawing below in conjunction with embodiment.

Description of drawings

Fig. 1 is the block diagram of current mode source of resistance AC/AC frequency converter of the present invention;

Fig. 2 is the circuit structure diagram of single-phase electricity flow pattern source of resistance AC/AC frequency converter;

Fig. 3 is the circuit structure diagram of three-phase electricity flow pattern source of resistance AC/AC frequency converter;

Fig. 4 is the circuit structure diagram of the bidirectional switch of power diode bridge formation;

The circuit structure diagram of Fig. 5 common collector insulated gate bipolar transistor IGBT bidirectional switch;

Fig. 6 (a) is the non-open circuit nought state of single-phase electricity flow pattern source of resistance AC-AC frequency converter equivalent circuit diagram;

Fig. 6 (b) is single-phase electricity flow pattern source of resistance AC-AC frequency converter open circuit nought state equivalent circuit diagram;

Fig. 7 is the circuit diagram of single phase alternating current (A.C.) electric power electronic switch matrix and AC load part;

Fig. 8 is that the gain of single-phase electricity flow pattern source of resistance AC-AC frequency converter voltage is about the curve chart of open circuit nought state duty ratio relation;

Fig. 9 is the circuit structure diagram of single-phase electricity flow pattern source of resistance AC/AC frequency converter DSP or FPGA and logical circuit;

Figure 10 is the circuit structure diagram of three-phase electricity flow pattern source of resistance AC/AC frequency converter DSP or FPGA and logical circuit.

Embodiment

With reference to Fig. 1, current mode source of resistance AC/AC frequency converter of the present invention, comprise the alternating-current voltage source or AC load, ac power electronic switch, source of resistance network, ac power electronic switch matrix and AC load or the alternating-current voltage source that constitute major loop, ac power electronic switch is parallel between source of resistance network and the alternating-current voltage source, the ac power electronic switch matrix is connected between source of resistance network and the load, the symmetry lattice network of source of resistance network for being made of some inductors and capacitor.

Current mode source of resistance AC/AC frequency converter of the present invention, also comprise the current source inverter controller DSP or FPGA and the logical circuit that constitute control loop, current source inverter controller DSP or FPGA are used for the nought state signal of output is connected to the drive circuit input of ac power electronic switch, with the conducting of control ac power electronic switch.Logical circuit was used for distributing the control signal of controlling the electronic power switch matrix in each fixing cycle of source current, this control signal was connected to the drive circuit input of each ac power electronic switch in the ac power electronic switch matrix respectively.

Adopt control strategies such as Sine Pulse Width Modulation, space vector control SVPWM, utilize current source inverter controller DSP or FPGA to produce the current mode switch control signal, logical circuit comprise one with the door and OR circuit and a not gate and AND circuit, link to each other with current source inverter controller DSP or FPGA output signal with OR circuit with door, be used for output nought state signal; Not gate and AND circuit with the negate of traditional nought state signal after with current source inverter controller DSP or FPGA output signal with, be used for output to the control signal of ac power electronic switch matrix.

AC/AC frequency converter of the present invention, the output of alternating-current voltage source and the input of ac power electronic switch are connected with inductor L, are used for making mains side to be equivalent to current source or flow when reverse as filter at power.The input of the output of source of resistance network and ac power electronic switch matrix is connected with current detecting, conversion and filter, is used for obtaining the fundametal compoment of electric current.

AC/AC frequency converter of the present invention, the HF switch work of the regularity by ac power electronic switch, the passive component of source of resistance network periodically discharges and recharges, and realizes rising or the reduction of output voltage amplitude and frequency.

Embodiment one, the single-phase electricity flow pattern

With reference to Fig. 2, comprise the single phase alternating current (A.C.) voltage source u, the ac power electronic switch S that constitute major loop ₁, the ac power electronic switch matrix S ₁₁-S ₂₂, one by two inductance L ₁, L ₂With two capacitor C ₁, C ₂The source of resistance network and the AC load Z that constitute, and the current source inverter controller DSP or the FPGA that constitute control loop.Ac power electronic switch S ₁Be parallel between source of resistance network and the alternating-current voltage source u output of alternating-current voltage source u and ac power electronic switch S ₁Input be connected with inductor L.The ac power electronic switch matrix S ₁₁-S ₂₂Be connected between source of resistance network and the AC load Z.The ac power electronic switch matrix is by first ac power electronic switch to the, four ac power electronic switch S ₁₁-S ₂₂Array forms.Five ac power electronic switch S ₁, S ₁₁-S ₂₂Form five ac power electronic switch S by rectifier bridge and an all-controlling power electronics device that 4 power diodes constitute ₁, S ₁₁-S ₂₂Be operated in the HF switch state.Because five ac power electronic switch S ₁, S ₁₁-S ₂₂All be operated in the HF switch state, the voltage and current of source of resistance network element is high-frequency pulse signal, and needed inductance value and capacitance are very little.For example, the single-phase electricity flow pattern source of resistance AC-AC frequency converter of a 5kW, its source of resistance network inductor L ₁, L ₂Inductance value at 1mH, capacitor C ₁, C ₂Capacitance when the 20 μ F left and right sides, can obtain good effect.The main effect of input side inductor L is filtering and makes input side become current source, because bidirectional switch all is operated in the HF switch state, the needed inductance value of input side inductor L is also very little.

Five ac power electronic switch S ₁, S ₁₁-S ₂₂Can adopt all structures of existing bi-directional electric power electronic switch, wherein structure has two kinds of versions preferably, i.e. bidirectional switch and the common collector insulated gate bipolar transistor IGBT bidirectional switch of power diode bridge formation.With reference to Fig. 4 and Fig. 5, the former only contains a full-control type power device, and control is simple, but the sense of current is uncontrollable, each the time be carved with three power devices conductions, loss is relatively large; The latter is many with a full-control type power device, but the sense of current is controlled, each the time be carved with two power devices and participate in conducting electricity, loss is less relatively, and compares with the common emitter bidirectional switch, required isolated driving power number is less.

The course of work of this main circuit:

The power stream of single-phase electricity flow pattern source of resistance AC-AC converter circuit can two-way flow, by to five ac power electronic switch S in the circuit ₁, S ₁₁-S ₂₂Reasonable control can realize the adjusting of mains side power factor.Owing to be that the electric current in the circuit is carried out corresponding control, the dynamic response of circuit is faster.

The source of resistance network of single-phase electricity flow pattern source of resistance AC-AC frequency converter also is symmetrical, that is to say inductor L ₁, L ₂Has identical inductance value, capacitor C ₁, C ₂Has identical capacitance.Therefore, have

i _L1=i _L2=i _L=I _Lsin(ωt+φ _L)，

i _C1=i _C2=i _C=I _Csin(ωt+φ _C)，

v _C1=v _C2=v _C=V _Csin(ωt+φ _C－90°) (1)

Wherein, Φ _LBe inductor L ₁, L ₂The initial phase of electric current, Φ _CBe capacitor C ₁, C ₂The initial phase of electric current.The control method of classical matrix converter as SPWM or SVPWM, also can be applied to single-phase electricity flow pattern source of resistance AC-AC frequency converter.Because particular structure, this circuit has an extra work state: the open circuit nought state, and when the ac power electronic switch matrix S ₁₁-S ₂₂All switches when all turn-offing, the output of source of resistance network open circuit.Traditional matrix converter nought state of not opening a way will be because that will cause the open circuit of inductive load.From the angle of impedance matching, general mains side is voltage source, and load-side should be inductive, i.e. current source; Mains side is current source, and load-side should be capacitive character, i.e. voltage source.Therefore, for current mode source of resistance AC-AC frequency converter, because its load-side often has capacitive filtering link, the existence of open circuit nought state is rationally feasible.The existence of symmetric source of resistance network; make at circuit working to have the afterflow path at open circuit nought state switch matrix of following time input side electric current, namely capacitor both can afterflow, also can play the voltage clamping effect simultaneously; reduce the voltage stress of switching device, the protection switch device.The existence of what is more important source of resistance network, the increase that gains for circuit voltage provides possibility.

In a switch periods, single-phase electricity flow pattern source of resistance AC-AC frequency converter has following three operating states:

(1) effective operating state, the ac power electronic switch matrix S ₁₁-S ₂₂Middle S ₁₁And S ₂₂Or S ₂₁And S ₁₂Conducting simultaneously, ac power electronic switch S ₁Turn-off, the energy of power supply can be transferred to load;

(2) traditional nought state, the ac power electronic switch matrix S ₁₁-S ₂₂Middle S ₁₁And S ₁₂Or S ₂₁And S ₂₂Conducting simultaneously, ac power electronic switch S ₁Turn-off, the energy of power supply can not be transferred to load;

(3) open circuit nought state, 4 switch S in the ac power electronic switch matrix ₁₁-S ₂₂All turn-off ac power electronic switch S ₁Conducting, load still can not get energy.

Because load-side often is parallel with filtering capacitor, can be considered voltage source at a switch periods internal burden.Under above-mentioned second kind of operating state, same brachium pontis is two Switch Cut-through up and down, and circuit output can be regarded the zero voltage source as.Therefore, under (1) of non-open circuit nought state and (2) two kinds of operating states, we can be with same equivalent circuit description single-phase electricity flow pattern source of resistance AC-AC frequency converter, and shown in Fig. 6 (a), the equivalent electric circuit under the open circuit nought state is shown in Fig. 6 (b).I among Fig. 6 _i, i _ZiAnd i _ZoBe respectively mains side input current, source of resistance network input side and outlet side electric current, source of resistance network outlet side electric current is switch matrix input side electric current.If the fundametal compoment of above-mentioned electric current is:

Wherein, I _I1m, I _Zi1m, I _Zo1mBe the amplitude of corresponding electric current, ω _iBe its angular frequency,

Initial phase for corresponding electric current.

For Fig. 6 (a), i is arranged _C=i _Zi-i _L, i _Z0=2i _L-i _Zi, i _Zi=i _i, (2)

Inductor charging in this process, the capacitor discharge, circuit working is (1-D) T in the time of this state, and D is the conducting duty ratio of switch S, and T is switch periods.

For Fig. 6 (b), i is arranged _C=i _L, i _Z0=0, i _Zi=2i _L(3)

Inductor discharge in this process, the capacitor charging, circuit working is DT in the time of this state.

Under steady-working state, the mean value of condenser current in a power cycle should be 0, can obtain from (2) and (3):

$I_C=\stackrel{\‾}{i_L}=\∫[i_L\·\mathrm{DT}+(i_i-i_L)\·(1-D)T]\mathrm{dt}=0$

Perhaps $\frac{i_{\mathrm{Llm}}}{I_{\mathrm{ilm}}}=\left|\frac{1-D}{1-2D}\right|,$

When D＜0.5, φ _L=0; As D〉0.5 the time, φ _L=π.（4）

Because the capacitance of source of resistance network capacitors is very little, the fundamental current that flows through is very little, so source of resistance network outlet side electric current is approximately equal to source of resistance network inductive current.Thereby,

$I_{\mathrm{Zolm}}\≈\left|\frac{1-D}{1-2D}\right|I_{\mathrm{ilm}},$

When D＜0.5, φ _Zo=0; As D〉0.5 the time, φ _Zo=π.（5）

The input current of switch matrix and the relation of output current can go to derive according to principle of matrix converter and the course of work.For single-phase electricity flow pattern source of resistance AC-AC frequency converter, the circuit of its switch matrix and AC load part as shown in Figure 7.Output current i _oBe by current i _ZoBy four bidirectional switch S ₁₁-S ₂₂The regular switch motion of periodicity generate.Its control mode is: output current is considered as by being input as i _ZoDirect current produce by current source inverter, adopt the modulation of SPWM or SVPWM method.In current i _ZoPositive half cycle, the switch order of four bidirectional switchs is identical with the single-way switch of monophase current source inventer; In current i _ZoNegative half period, four bidirectional switchs still are equivalent to four switches of monophase current source inventer, but same brachium pontis up and down the control signal of two switches to exchange, namely

The adjusting of output current amplitude realizes that by changing modulation factor the adjusting of output current frequency realizes by the frequency that changes modulation signal.By the SPWM modulation principle of monophase current source inventer, the duty ratio of Zui Da effective operating state is as can be known:

$A_{\max }=\max \left(\frac{M\sin {\mathrm{\ω}}_{o}t-M\sin ({\mathrm{\ω}}_{o}t-\mathrm{\π})}{2}\right)=\max \left(M\sin {\mathrm{\ω}}_{o}t\right)=M---\left(6\right)$

The amplitude of output current first-harmonic is: I _O1m=MI _Zo1m(7)

Therefore, the fundamental voltage amplitude of output current and input current closes and is:

$I_{\mathrm{olm}}={\mathrm{MI}}_{\mathrm{Zolm}}=M\·\frac{1-D}{1-2D}{I}_{\mathrm{ilm}}---\left(8\right)$

Adopting under identical with the current mode Z-source inverter simple situation that rises current control mode, namely positive and negative two direct voltages and the triangular carrier that equals the modulated sinusoid amplitude with amplitude goes comparison, produce open circuit nought state signal, M=1-D, D is the duty ratio of open circuit nought state.Therefore,

$I_{\mathrm{olm}}={\mathrm{MI}}_{\mathrm{Zolm}}=\frac{{(1-D)}^2}{1-2D}{I}_{\mathrm{ilm}}---\left(9\right)$

Obviously, by regulating modulation factor M, the amplitude that can regulate output current.If think input side and outlet side power-balance, then the magnitude relation of output voltage and input voltage is:

$U_{\mathrm{olm}}=\frac{1-2D}{{(1-D)}^2}{U}_{\mathrm{im}}---\left(10\right)$

Be that output voltage amplitude also can be regulated on a large scale.The curve of formula (10) correspondence as shown in Figure 8.

The relation that should be pointed out that above-mentioned voltage gain is rough, and it also should have relation with the frequency ratio of input, output.Accurate quantitative relation is very complicated, does not repeat them here.

Here, provide the logic control method in a kind of single-phase electricity flow pattern source of resistance AC/AC Frequency Converter Control loop, this method comprises:

(1) with the first output a to the, the four output d of described current source inverter controller DSP or FPGA through first with door and second be connected to first or input, by first or door obtain the nought state signal, and the nought state signal of output is connected to ac power electronic switch S ₁The drive circuit input, with control ac power electronic switch S ₁Conducting;

(2) the nought state signal is connected to the input of first not gate, the output of first not gate be connected to respectively the 3rd with Men Zhidi six input with door, the first output a to the, the four output d of current source inverter controller DSP or FPGA respectively corresponding be connected to the 3rd with Men Zhidi six another input with door, obtain 4 tunnel output signals with Men Zhidi six with door by the 3rd, and correspondence is connected to described first ac power electronic switch to the, four ac power electronic switch S respectively ₁₁, S ₁₂, S ₂₁, S ₂₂Drive circuit input separately is with control ac power electronic switch matrix S in each positive and negative half cycle of source current ₁₁, S ₁₂, S ₂₁, S ₂₂Conducting.

With reference to Fig. 9, control loop comprises the logical circuit that links to each other with current source inverter controller DSP or FPGA, and logical circuit comprises an ac power electronic switch control circuit and an ac power electronic switch matrix control circuit.The ac power electronic switch control circuit comprise first with the door, second with the door and first or, the first output a of current source inverter controller DSP or FPGA and the second output b be connected to first with the door input, the 3rd output c of current source inverter controller DSP or FPGA and the 4th output d be connected to second with the door input, first is connected to first or the input of door, first or export the nought state signal with door and second with the output of door.

The ac power electronic switch matrix control circuit comprise first not gate and the 3rd with Men Zhidi six and door, the nought state signal is connected to the input of first not gate, the output of first not gate be connected to respectively the 3rd with Men Zhidi six input with door, the first output a to the, the four output d of current source inverter controller DSP or FPGA be connected to respectively the 3rd with Men Zhidi six another input with door, the 3rd with the output of Men Zhidi six and door source current each just, in the negative half period, output signal is connected to first ac power electronic switch to the, four ac power electronic switch S respectively in turn ₁₁, S ₁₂, S ₂₁, S ₂₂Drive circuit input separately is to control described ac power electronic switch matrix S ₁₁, S ₁₂, S ₂₁, S ₂₂Conducting.That is to say that at the positive half cycle of electric current, the control order of switch is identical with single-phase electricity flow pattern inverter; At the negative half period of electric current, the control order modification of switch, i.e. S ₁₁And S ₁₂Control signal exchange, S ₂₁And S ₂₂Control signal exchange.

Embodiment two, the three-phase electricity flow pattern

With reference to Fig. 3, comprise the three-phase alternating current potential source u that constitutes major loop _A, u _B, u _C, three-phase ac power electronic switch S ₂, phase impedance source network, three-phase ac power electronic switch matrix S ₁₁-S ₃₃, the clamped circuit Q of three-phase and three-phase alternating current load Z _A, Z _B, Z _C

Three-phase ac power electronic switch S ₂Be the bidirectional switch that is constituted by 6 power diode bridges.

The phase impedance source network is by 3 inductance L ₁, L ₂And L ₃With 3 capacitor C ₁, C ₂And C ₃The symmetry lattice network that constitutes, three-phase ac power electronic switch S ₂Be parallel to phase impedance source network and three-phase alternating current potential source u _A, u _B, u _CBetween, three-phase ac power electronic switch matrix S ₁₁-S ₃₃Be connected in phase impedance source network and three-phase alternating current load Z _A, Z _B, Z _CBetween, three-phase ac power electronic switch matrix S ₁₁-S ₃₃By first ac power electronic switch to the, nine ac power electronic switch S ₁₁-S ₃₃Array forms, because 9 ac power electronic switch S ₁₁-S ₃₃All be operated in the HF switch state, the voltage and current of source of resistance network element is high-frequency pulse signal, and needed inductance value and capacitance are very little.For example, the three-phase electricity flow pattern source of resistance AC-AC frequency converter of a 15kW, its source of resistance network inductor L ₁, L ₂And L ₃Inductance value at 1mH, capacitor C ₁, C ₂And C ₃Capacitance when the 20 μ F left and right sides, can obtain good effect.

Three-phase alternating current potential source u _A, u _B, u _COutput and three-phase ac power electronic switch S ₂Input be connected with three-phase inductor L _A, L _B, L _CInput side inductor L _A, L _BAnd L _CMain effect be filtering and make input side become current source because bidirectional switch all is operated in the HF switch state, input side inductor L _A, L _BAnd L _CNeeded inductance value is also very little.

The clamped circuit Q of three-phase is connected in three-phase ac power electronic switch matrix S ₁₁-S ₃₃With three-phase alternating current load Za, Z _b, Z _cBetween.

Ac power electronic switch S ₂Adopt power diode bridge-type two-way switch, simple in structure although loss is relatively large, three-phase shares a switch.First ac power electronic switch to the, nine ac power electronic switch S ₁₁-S ₃₃Be respectively the bidirectional switch or the common collector insulated gate bipolar transistor IGBT bidirectional switch that are constituted by 4 power diode bridges.The former only contains a full-control type power device, and control is simple, but the sense of current is uncontrollable, each the time be carved with three power devices conductions, loss is relatively large; The latter is many with a full-control type power device, but the sense of current is controlled, each the time be carved with two power devices and participate in conducting electricity, loss is less relatively, and compares with the common emitter bidirectional switch, required isolated driving power number is less.

The course of work of this main circuit:

The power of three-phase electricity flow pattern source of resistance ac-to-ac converter circuit stream also can two-way flow, by to 10 ac power electronic switch S in the circuit ₂, S ₁₁-S ₃₃Reasonable control can realize the adjusting of mains side power factor.Owing to be that the electric current in the circuit is carried out corresponding control, the dynamic response of circuit is faster.

The source of resistance network of three-phase electricity flow pattern source of resistance AC-AC frequency converter also is symmetrical, that is to say inductor L ₁, L ₂And L ₃Has identical inductance value, capacitor C ₁, C ₂And C ₃Has identical capacitance.Therefore, according to the similar analytic process of single phase circuit, can know that output voltage amplitude and frequency can regulate on a large scale.

Since the existence of phase impedance source network, three-phase ac power electronic switch matrix S ₁₁-S ₃₃9 switches can have 2 ⁹=512 kinds of possible working methods.Circuit is realized the increase of voltage gain by typical open circuit nought state, so unallowed this circuit of open-circuit condition needs to exist in the classical matrix converter, and current mode circuit often adds capacitor filtering to realize impedance matching in load-side, and the inductance current behind the open circuit is by the filtering capacitor afterflow.Thereby, be connected to three-phase ac power electronic switch matrix S ₁₁-S ₃₃The conducting simultaneously of 3 switches of the same phase of input side or any two switches, otherwise will cause the short circuit of load-side capacitor.Three-phase ac power electronic switch matrix S ₁₁-S ₃₃All there are 7 kinds of situations mutually input side in each, has 21 kinds of situations.

Add clamped circuit Q and when not using the three-phase Capacitor filter, the operating state of above-mentioned 21 kinds of situations allows when adopting in load-side.The same with traditional three-phase matrix converter, three-phase electricity flow pattern source of resistance AC-AC frequency converter also needs to realize control with DSP or FPGA.The same with single phase circuit, need be at three-phase ac power electronic switch matrix S ₁₁-S ₃₃Nought state during, make the ac power electronic switch S of circuit front-end as required ₂The open circuit nought state is inserted in conducting in switch matrix.Under the situation of three-phase input voltage symmetry, when being connected to three switches conducting simultaneously of the same phase of load, this phase current is 0, thinks that circuit is in nought state, this has 7 kinds of situations, i.e. single-phase straight-through (3 kinds), two-phase straight-through (3 kinds) and three-phase straight-through (a kind).Only under the situation that symmetric source of resistance network exists, this nought state could exist, otherwise can cause the short circuit of power supply.Under this kind operating state, make three-phase ac power electronic switch matrix S ₁₁-S ₃₃Nine switch complete shut-downs disconnected, insert the open circuit nought state, do not influence the size of output voltage, electric current, and can make the electric current of switch matrix input side adjusted, realized enlarging the purpose of voltage gain.

The method of its control is to realize all possible on off state vector of switch matrix by space vector control SVPWM method, exports 9 tunnel control signals.Here, provide the logic control method in a kind of three-phase electricity flow pattern source of resistance AC/AC Frequency Converter Control loop, this method comprises:

(1) the first output e to the, the nine output m of threephase switch space of matrices vector controller DSP or FPGA is connected to second or the input of door with door, the 9th with door with door, the 8th through the 7th, by second or door obtain three-phase nought state signal, and the three-phase nought state signal of output is connected to described three-phase ac power electronic switch S ₂The drive circuit input, to control described three-phase ac power electronic switch S ₂Conducting;

(2) three-phase nought state signal is connected to the input of second not gate, the output of second not gate be connected to respectively the tenth with Men Zhidi 18 input with door, the first output e to the, the nine output m of threephase switch space of matrices vector controller DSP or FPGA respectively corresponding be connected to the tenth with Men Zhidi 18 another input with door, obtain 9 tunnel output signals with Men Zhidi 18 with door by the tenth, and correspondence is connected to first ac power electronic switch to the, nine ac power electronic switch S respectively ₁₁-S ₃₃Drive circuit input separately is with control three-phase ac power electronic switch matrix S ₁₁-S ₃₃Conducting.

With reference to Figure 10, control loop comprises the logical circuit that links to each other with threephase switch space of matrices vector controller DSP or FPGA, logical circuit comprises three-phase ac power electronic switch control circuit and three-phase ac power electronic switch matrix control circuit, the three-phase ac power electronic switch control circuit comprise the 7th with the door, the 8th with the door, the 9th with the door and second or, the first output e of threephase switch space of matrices vector controller DSP or FPGA, second Ausgang and the 3rd output g be connected to the 7th with the door input, the 4th output h of threephase switch space of matrices vector controller DSP or FPGA, the 5th output i and the 6th output j be connected to the 8th with the door input, the 7th output k of switch matrix space vector controller DSP or FPGA, the 8th output l and the 9th output m be connected to the 9th with the door input, the 7th with the door, the 8th with door and the 9th with the output of door be connected to second or the input of door, second or door export three-phase nought state signal; Three-phase ac power electronic switch matrix control circuit comprise second not gate and the tenth with Men Zhidi 18 and door, three-phase nought state signal is connected to the input of second not gate, the output of second not gate be connected to respectively the tenth with Men Zhidi 18 input with door, the first output e to the, the nine output m of threephase switch space of matrices vector controller DSP or FPGA respectively corresponding be connected to the tenth with Men Zhidi 18 another input with door, the tenth is connected to first ac power electronic switch to the, nine ac power electronic switch S respectively with the output of Men Zhidi 18 and door ₁₁-S ₃₃Drive circuit input separately is with control three-phase ac power electronic switch matrix S ₁₁-S ₃₃Conducting.

In above-mentioned two embodiment, current mode source of resistance AC/AC frequency converter of the present invention is by regulating ac power electronic switch S ₁Or S ₂Duty regulation voltage gain recently, voltage gain both can be greater than 1, also can be less than 1.Frequency converter is by regulating the ac power electronic switch matrix S ₁₁-S ₂₂Or S ₁₁-S ₃₃Modulating frequency regulate output voltage frequency, its output frequency both can be lower than supply frequency, also can be higher than supply frequency.Therefore, but current mode source of resistance AC/AC frequency converter step-less adjustment output voltage amplitude of the present invention and frequency.

Current mode source of resistance AC/AC frequency converter of the present invention, owing to adopt the source of resistance network, the damage that when having avoided the same cross streams switch of outlet side common-mode to turn-off switch has been caused, circuit has extreme high reliability.

Current mode source of resistance AC/AC frequency converter of the present invention, wherein ac power electronic switch and ac power electronic switch matrix are operated in the HF switch state, alternating-current voltage source replaces with AC load, and AC load replaces with alternating-current voltage source simultaneously, the two-way flow of power stream.

Embodiment three, connect inductive load

Current mode source of resistance AC/AC frequency converter is answered the shunt capacitance filter or is met the clamped circuit Q of three-phase between ac power electronic switch matrix and AC load.

Embodiment recited above is described preferred implementation of the present invention; be not that the spirit and scope of the present invention are limited; do not breaking away under the design prerequisite of the present invention; common engineers and technicians make technical scheme of the present invention in this area various modification and improvement; all should fall into protection scope of the present invention; the technology contents that the present invention asks for protection all is documented in claims.

Claims (10)

1. a single-phase electricity flow pattern source of resistance AC/AC frequency converter comprises the single phase alternating current (A.C.) voltage source (u), the ac power electronic switch (S that constitute major loop ₁), ac power electronic switch matrix (S ₁₁, S ₁₂, S ₂₁, S ₂₂) and AC load (Z), and the current source inverter controller DSP or the FPGA that constitute control loop, described current source inverter controller DSP or FPGA are used for the nought state signal of output is connected to described ac power electronic switch (S ₁) the drive circuit input, to control described ac power electronic switch (S ₁) conducting, it is characterized in that: described major loop also comprises a source of resistance network, control loop also comprises the logical circuit that links to each other with described current source inverter controller DSP or FPGA, wherein:

Described source of resistance network is by two inductance (L ₁And L ₂) and two capacitor (C ₁And C ₂) the symmetry lattice network that constitutes, described ac power electronic switch (S ₁) be parallel between described source of resistance network and the described alternating-current voltage source (u) described ac power electronic switch matrix (S ₁₁, S ₁₂, S ₂₁, S ₂₂) be connected between described source of resistance network and the described AC load (Z) described ac power electronic switch matrix (S ₁₁, S ₁₂, S ₂₁, S ₂₂) by first ac power electronic switch to the, four ac power electronic switch (S ₁₁, S ₁₂, S ₂₁, S ₂₂) array forms;

Described logical circuit comprises an ac power electronic switch control circuit and an ac power electronic switch matrix control circuit, described ac power electronic switch control circuit comprise first with the door, second with the door and first or, first output (a) of described current source inverter controller DSP or FPGA and second output (b) be connected to first with the door input, the 3rd output (c) of described current source inverter controller DSP or FPGA and the 4th output (d) be connected to second with the door input, first is connected to first or the input of door, first or export the nought state signal with door and second with the output of door; The ac power electronic switch matrix control circuit comprise first not gate and the 3rd with Men Zhidi six and door, described nought state signal is connected to the input of first not gate, the output of first not gate be connected to respectively the 3rd with Men Zhidi six input with door, first output (a) of described current source inverter controller DSP or FPGA to the 4th output (d) be connected to respectively the 3rd with Men Zhidi six another input with door, the 3rd with the output of Men Zhidi six and door source current each just, in the negative half period, output signal is connected to described first ac power electronic switch to the, four ac power electronic switch (S respectively in turn ₁₁, S ₁₂, S ₂₁, S ₂₂) separately drive circuit input, to control described ac power electronic switch matrix (S ₁₁, S ₁₂, S ₂₁, S ₂₂) conducting.

2. AC/AC frequency converter according to claim 1 is characterized in that: wherein said ac power electronic switch (S ₁) be the bidirectional switch that is constituted by 4 power diode bridges.

3. AC/AC frequency converter according to claim 1 is characterized in that: wherein said ac power electronic switch (S ₁) be a common collector insulated gate bipolar transistor IGBT bidirectional switch.

4. according to claim 1 or 2 or 3 described AC/AC frequency converters, it is characterized in that: the output of wherein said alternating-current voltage source (u) and described ac power electronic switch (S ₁) input be connected with inductor (L).

5. the logic control method in a single-phase electricity flow pattern source of resistance AC/AC Frequency Converter Control loop, this method arranges ac power electronic switch control circuit and ac power electronic switch matrix control circuit, described ac power electronic switch control circuit comprise first with the door, second with the door and first or, the ac power electronic switch matrix control circuit comprise first not gate and the 3rd with Men Zhidi six and door, this method comprises:

(1) with first output (a) of current source inverter controller DSP or FPGA to the 4th output (d) through first with door and second be connected to first or input, by first or door obtain the nought state signal, and the nought state signal of output is connected to ac power electronic switch (S ₁) the drive circuit input, to control described ac power electronic switch (S ₁) conducting;

(2) described nought state signal is connected to the input of first not gate, the output of first not gate be connected to respectively the 3rd with Men Zhidi six input with door, first output (a) of described current source inverter controller DSP or FPGA to the 4th output (d) respectively corresponding be connected to the 3rd with Men Zhidi six another input with door, obtain 4 tunnel output signals with Men Zhidi six with door by the 3rd, and correspondence is connected to first ac power electronic switch to the, four ac power electronic switch (S respectively ₁₁, S ₁₂, S ₂₁, S ₂₂) separately drive circuit input, with control ac power electronic switch matrix (S in each positive and negative half cycle of source current ₁₁, S ₁₂, S ₂₁, S ₂₂) conducting.

6. a three-phase electricity flow pattern source of resistance AC/AC frequency converter comprises the three-phase alternating current potential source (u that constitutes major loop _A, u _B, u _C), three-phase ac power electronic switch (S ₂), three-phase ac power electronic switch matrix (S ₁₁-S ₃₃) and three-phase alternating current load (Za, Z _b, Z _c), and the threephase switch space of matrices vector controller DSP or the FPGA that constitute control loop, described threephase switch space of matrices vector controller DSP or FPGA are used for the three-phase nought state signal of output is connected to described three-phase ac power electronic switch (S ₂) the drive circuit input, to control described ac power electronic switch (S ₂) conducting, it is characterized in that: described major loop also comprises phase impedance source network and the clamped circuit of three-phase (Q), control loop also comprises the logical circuit that links to each other with described threephase switch space of matrices vector controller DSP or FPGA, wherein:

Described phase impedance source network is by 3 inductance (L ₁, L ₂And L ₃) and 3 capacitor (C ₁, C ₂And C ₃) the symmetry lattice network that constitutes, described three-phase ac power electronic switch (S ₂) be parallel to described phase impedance source network and described three-phase alternating current potential source (u _A, u _B, u _C) between, described three-phase ac power electronic switch matrix (S ₁₁-S ₃₃) be connected in described phase impedance source network and described three-phase alternating current load (Za, Z _b, Z _c) between, described three-phase ac power electronic switch matrix (S ₁₁-S ₃₃) by first ac power electronic switch to the, nine ac power electronic switch (S ₁₁-S ₃₃) array forms, the clamped circuit of three-phase (Q) is connected in described three-phase ac power electronic switch matrix (S ₁₁-S ₃₃) and described three-phase alternating current load between;

Described logical circuit comprises three-phase ac power electronic switch control circuit and three-phase ac power electronic switch matrix control circuit, described three-phase ac power electronic switch control circuit comprise the 7th with the door, the 8th with the door, the 9th with the door and second or, first output (e) of described threephase switch space of matrices vector controller DSP or FPGA, second output (f) and the 3rd output (g) be connected to the 7th with the door input, the 4th output (h) of described threephase switch space of matrices vector controller DSP or FPGA, the 5th output (i) and the 6th output (j) be connected to the 8th with the door input, the 7th output (k) of described threephase switch space of matrices vector controller DSP or FPGA, the 8th output (l) and the 9th output (m) be connected to the 9th with the door input, the 7th with the door, the 8th with door and the 9th with the output of door be connected to second or the input of door, second or door export three-phase nought state signal; Three-phase ac power electronic switch matrix control circuit comprise second not gate and the tenth with Men Zhidi 18 and door, described three-phase nought state signal is connected to the input of second not gate, the output of second not gate be connected to respectively the tenth with Men Zhidi 18 input with door, first output (e) of three-phase electricity flow pattern circuit control device DSP or FPGA to the 9th output (m) respectively corresponding be connected to the tenth with Men Zhidi 18 another input with door, the tenth is connected to described first ac power electronic switch to the, nine ac power electronic switch (S respectively with the output of Men Zhidi 18 and door ₁₁-S ₃₃) separately drive circuit input, to control described three-phase ac power electronic switch matrix (S ₁₁-S ₃₃) conducting.

7. AC/AC frequency converter according to claim 6 is characterized in that: wherein said three-phase ac power electronic switch (S ₂) be the bidirectional switch that is constituted by 6 power diode bridges, described first ac power electronic switch to the, nine ac power electronic switch (S ₁₁-S ₃₃) be respectively the bidirectional switch that is constituted by 4 power diode bridges.

8. AC/AC frequency converter according to claim 6 is characterized in that: wherein said three-phase ac power electronic switch (S ₂) be the bidirectional switch that is constituted by 6 power diode bridges, described first ac power electronic switch to the, nine ac power electronic switch (S ₁₁-S ₃₃) be respectively common collector insulated gate bipolar transistor IGBT bidirectional switch.

9. according to claim 6 or 7 or 8 described AC/AC frequency converters, it is characterized in that: wherein said three-phase alternating current potential source (u _A, u _B, u _C) output and described three-phase ac power electronic switch (S ₂) input be connected with three-phase inductor (L _A, L _B, L _C).

10. the logic control method in a three-phase electricity flow pattern source of resistance AC/AC Frequency Converter Control loop, this method arranges three-phase ac power electronic switch control circuit and three-phase ac power electronic switch matrix control circuit, described three-phase ac power electronic switch control circuit comprise the 7th with the door, the 8th with the door, the 9th with the door and second or the door, three-phase ac power electronic switch matrix control circuit comprise second not gate and the tenth with Men Zhidi 18 and door, this method comprises:

(1) first output (e) of threephase switch space of matrices vector controller DSP or FPGA is connected to second or the input of door with door, the 9th with door with door, the 8th through the 7th to the 9th output (m), by second or door obtain three-phase nought state signal, and the three-phase nought state signal of output is connected to three-phase ac power electronic switch (S ₂) the drive circuit input, to control described three-phase ac power electronic switch (S ₂) conducting;

(2) described three-phase nought state signal is connected to the input of second not gate, the output of second not gate be connected to respectively the tenth with Men Zhidi 18 input with door, first output (e) of described threephase switch space of matrices vector controller DSP or FPGA to the 9th output (m) respectively corresponding be connected to the tenth with Men Zhidi 18 another input with door, obtain 9 tunnel output signals with Men Zhidi 18 with door by the tenth, and correspondence is connected to first ac power electronic switch to the, nine ac power electronic switch (S respectively ₁₁-S ₃₃) separately drive circuit input, with control three-phase ac power electronic switch matrix (S ₁₁-S ₃₃) conducting.

Images