CN204696953U - A kind of Z-source inverter being applicable to photovoltaic generation - Google Patents

A kind of Z-source inverter being applicable to photovoltaic generation Download PDF

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Publication number
CN204696953U
CN204696953U CN201520354195.XU CN201520354195U CN204696953U CN 204696953 U CN204696953 U CN 204696953U CN 201520354195 U CN201520354195 U CN 201520354195U CN 204696953 U CN204696953 U CN 204696953U
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China
Prior art keywords
inductance
electric capacity
switching tube
boost
source network
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CN201520354195.XU
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Inventor
张庆海
王李
王和先
李洪博
王新涛
孔鹏
鲍景宽
石星昊
郭亚峰
张蕊
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Liaocheng Power Supply Co of State Grid Shandong Electric Power Co Ltd
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Liaocheng Power Supply Co of State Grid Shandong Electric Power Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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Abstract

The utility model relates to a kind of Z-source inverter being applicable to photovoltaic generation, comprises Boost circuit, DC side storage capacitor C, switching tube S a1and anti-paralleled diode VD a1, Z source network, three phase inverter bridge, photovoltaic array, Boost circuit, DC side storage capacitor C, switching tube S a1and anti-paralleled diode VD a1, Z source network, three phase inverter bridge, load connect in turn, the direct current energy that photovoltaic array exports is transformed into AC energy, and is load supplying.Output voltage of the present utility model can lifting/lowering arbitrarily, very strong to the adaptive capacity of load, can be operated in any environment of heavy duty and underloading; The no-voltage conducting of converter bridge switching parts pipe can be realized, improve the fail safe of photovoltaic generating system, eliminate the impact of dead band on output AC voltage, reduce switching loss, improve switching context.

Description

A kind of Z-source inverter being applicable to photovoltaic generation
Technical field
The utility model relates to a kind of Z-source inverter being applicable to photovoltaic generation, belongs to distributed power generation and intelligent power grid technology field.
Background technology
The global energy important channel with problem of environmental pollution in short supply is alleviated in the utilization of solar energy, and photovoltaic generation is exactly one of focus of Recent study.Adopt at present ripe electric electronic current change technology to convert solar energy to electric energy, and then realize voltage transformation and power controls.
The Z-source inverter proposed in recent years gets the attention due to its outstanding feature.Its advantage mainly comprises: 1, use straight-through no-voltage to raise direct voltage to realize the boost function of inverter output voltage; 2, due to the introducing of Z source network, improve the fail safe of inverter bridge; Eliminate the impact of dead band on output AC voltage.These advantages of Z-source inverter make it have obvious advantage in the application scenario of the direct voltage wide variation such as photovoltaic generation.
But current traditional Z source inventer also exists following limitation: 1, during light running, the maximum of Z source network output voltage can be more and more higher, and from high frequency, Z source network output voltage exists distortion clearly.2, in order to ensure that circuit working is under CCM pattern, Z source network inductance must have individual minimum value, can not design too little, which increase the volume of system, weight and cost; When Z source network inductance is smaller, the control of inductor design, circuit voltage relation, system becomes quite complicated.
In order to solve the shortcoming of above-mentioned traditional Z source inventer, making system have the ability adapting to load large-scope change, can adopt and increase inductance and to the measure of diodes in parallel controllable devices.But increase inductance and correspondingly increase the weight of equipment, volume and expense, and can not fundamentally resolution system to the shortcoming of adaptive load ability.
Summary of the invention
For the deficiencies in the prior art, the utility model discloses a kind of Z-source inverter being applicable to photovoltaic generation, being elevated arbitrarily keeping Z-source inverter output voltage, allowing on the basis of the inverter bridge advantage such as pipe pass-through state up and down, overcome the shortcomings and limitations that it is intrinsic, adapt to the feature of direct voltage wide variation in photovoltaic generating system, and the occasion of load large-scope change can be applicable to further.
The technical solution of the utility model is: a kind of Z-source inverter being applicable to photovoltaic generation, comprises Boost circuit, DC side storage capacitor C, switching tube S a1and anti-paralleled diode VD a1, Z source network, three phase inverter bridge, photovoltaic array, Boost circuit, DC side storage capacitor C, switching tube S a1and anti-paralleled diode VD a1, Z source network, three phase inverter bridge, load connect in turn, the direct current energy that photovoltaic array exports is transformed into AC energy, and is load supplying; Boost circuit comprises photovoltaic side storage capacitor C 0, Boost boost inductance L 0, Boost circuit switching tube S 0, Boost circuit diode VD 0, photovoltaic array and photovoltaic side storage capacitor C 0be connected in parallel, photovoltaic array output cathode and Boost boost inductance L 0be connected, Boost boost inductance L 0the other end and Boost circuit switching tube S 0collector electrode, Boost circuit diode VD 0anode be connected, Boost circuit diode VD 0negative electrode and one end of DC side storage capacitor C, diode VD a1negative electrode, switching tube S a1collector electrode be connected, the other end of DC side storage capacitor C and Boost circuit switching tube S 0emitter, photovoltaic array output negative pole be connected; Z source network comprises inductance L 1, inductance L 2, electric capacity C 1, electric capacity C 2, inductance L 1, electric capacity C 2, inductance L 2, electric capacity C 1be connected to form series loop successively, inductance L 1with electric capacity C 1with switching tube S while of junction a1emitter, diode VD a1anode be connected, electric capacity C 2with inductance L 2junction is connected with photovoltaic array output negative pole simultaneously; Three phase inverter bridge comprises six switching tube S 1~ S 6and their respective anti-paralleled diode VD 1~ VD 6, switching tube S 1, S 3, S 5collector electrode be connected, as the input anode of three phase inverter bridge, and with inductance L in Z source network 1with electric capacity C 2junction be connected; Switching device S 2, S 4, S 6emitter be connected, as the input negative terminal of three phase inverter bridge, and with inductance L in Z source network 2with electric capacity C 1junction be connected; S 1emitter and S 2collector electrode be connected, S 3emitter and S 4collector electrode be connected, S 5emitter and S 6collector electrode be connected, by S 2, S 4, S 6collector electrode draw a, b, c tri-outputs of three phase inverter bridge respectively and be connected to load.
The advantage herein designed is, switching tube S a1enable the electric current reverse flow of Z source network, Boost circuit diode VD 0ensure that the one-way flow of source current, DC side storage capacitor C provides passage to the reverse current of circuit.
Preferred according to the present invention, in Z source network, inductance L 1with inductance L 2inductance value equal, electric capacity C 1with electric capacity C 2capacitance equal.
Preferred according to the present invention, the model of three phase inverter bridge is FF450R17ME4.
The beneficial effects of the utility model are: 1, output voltage can lifting/lowering arbitrarily, very strong to the adaptive capacity of load, can be operated in any environment of heavy duty and underloading; 2, the direct voltage distortion that Z source network causes can be eliminated; 3, the inductance of Z source network can design very little, decreases weight, volume and cost; 4, the no-voltage conducting of converter bridge switching parts pipe can be realized, improve the fail safe of inverter bridge in photovoltaic generating system, eliminate the impact of dead band on output AC voltage, reduce switching loss, improve switching context.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation.
Fig. 2 is the equivalent circuit diagram of utility model works pattern 1; In figure, I infor Z source network input current, I ifor Z source network output current, it is also the input current of three phase inverter bridge; V c1for electric capacity C 1voltage, V c2for electric capacity C 2voltage; I l1for flowing through inductance L 1electric current, I l2for flowing through inductance L 2electric current, because Z source network is symmetrical network, therefore have I l1=I l2, lower same.
Fig. 3 is the equivalent circuit diagram of utility model works pattern 2.
Fig. 4 is the equivalent circuit diagram of utility model works mode 3.
Fig. 5 is the equivalent circuit diagram of utility model works pattern 4.
Fig. 6 is the equivalent circuit diagram of utility model works pattern 5.
Fig. 7 is the equivalent circuit diagram of utility model works pattern 6.
Fig. 8 equivalent circuit diagram that is utility model works mode 7 when the whole conducting of the inverse parallel fly-wheel diode of three phase inverter bridge breaker in middle pipe.
Fig. 9 is utility model works mode 7 when equivalent circuit diagram during conducting under the effect of the switching tube in three phase inverter bridge at through connect signal.
Embodiment
Below in conjunction with Figure of description, the utility model is further elaborated, but is not limited thereto.
Be applicable to a Z-source inverter for photovoltaic generation, comprise Boost circuit, DC side storage capacitor C, switching tube S a1and anti-paralleled diode VD a1, Z source network, three phase inverter bridge, photovoltaic array, Boost circuit, DC side storage capacitor C, switching tube S a1and anti-paralleled diode VD a1, Z source network, three phase inverter bridge, load connect in turn, the direct current energy that photovoltaic array exports is transformed into AC energy, and is load supplying; Boost circuit comprises photovoltaic side storage capacitor C 0, Boost boost inductance L 0, Boost circuit switching tube S 0, Boost circuit diode VD 0, photovoltaic array and photovoltaic side storage capacitor C 0be connected in parallel, photovoltaic array output cathode and Boost boost inductance L 0be connected, Boost boost inductance L 0the other end and Boost circuit switching tube S 0collector electrode, Boost circuit diode VD 0anode be connected, Boost circuit diode VD 0negative electrode and one end of DC side storage capacitor C, diode VD a1negative electrode, switching tube S a1collector electrode be connected, the other end of DC side storage capacitor C and Boost circuit switching tube S 0emitter, photovoltaic array output negative pole be connected; Z source network comprises inductance L 1, inductance L 2, electric capacity C 1, electric capacity C 2, inductance L 1, electric capacity C 2, inductance L 2, electric capacity C 1be connected to form series loop successively, inductance L 1with electric capacity C 1with switching tube S while of junction a1emitter, diode VD a1anode be connected, electric capacity C 2with inductance L 2junction is connected with photovoltaic array output negative pole simultaneously; Three phase inverter bridge comprises six switching tube S 1~ S 6and their respective anti-paralleled diode VD 1~ VD 6, switching tube S 1, S 3, S 5collector electrode be connected, as the input anode of three phase inverter bridge, and with inductance L in Z source network 1with electric capacity C 2junction be connected; Switching device S 2, S 4, S 6emitter be connected, as the input negative terminal of three phase inverter bridge, and with inductance L in Z source network 2with electric capacity C 1junction be connected; S 1emitter and S 2collector electrode be connected, S 3emitter and S 4collector electrode be connected, S 5emitter and S 6collector electrode be connected, by S 2, S 4, S 6collector electrode draw a, b, c tri-outputs of three phase inverter bridge respectively and be connected to load.
A kind of Z-source inverter structural representation being applicable to photovoltaic generation as shown in Figure 1.
The advantage herein designed is, switching tube S a1enable the electric current reverse flow of Z source network, Boost circuit diode VD 0ensure that the one-way flow of source current, DC side storage capacitor C provides passage to the reverse current of circuit.
In described Z source network, inductance L 1with inductance L 2inductance value equal, electric capacity C 1with electric capacity C 2capacitance equal.
The model of described three phase inverter bridge is FF450R17ME4.
When utilizing simple step-up method to carry out control circuit, in a switch periods, have 7 kinds of mode of operations, to simplify the analysis, do following hypothesis: 1, device is ideal operation state; 2, photovoltaic array, Boost circuit are equivalent to a voltage source V 0; 3, three phase inverter bridge is equivalent to a voltage source V i.
Mode of operation 1: three phase inverter bridge is operated in traditional nought state, does not have output current, i.e. I i=0, voltage source V 0, DC side storage capacitor C is Z source network electric capacity C 1, electric capacity C 2charging.Figure 2 shows that the equivalent circuit diagram of mode of operation 1.
Mode of operation 2: three phase inverter bridge under non-straight-through nought state, Z source network input current I in, Z source network output current I iand inductance L 2electric current I l2the condition met is such as formula shown in (I):
（Ⅰ）。
Now, voltage source V 0, DC side storage capacitor C jointly for three phase inverter bridge is powered, Z source network electric capacity C 1and electric capacity C 2be in charged state.Figure 3 shows that the equivalent circuit diagram of mode of operation 2.
Mode of operation 3: along with inductance L 2electric current I l2lasting reduction, the electric capacity of Z source network starts powering load, Z source network input current I in, Z source network output current I iand inductance L 2electric current I l2the condition met is such as formula shown in (II):
（Ⅱ）。
Figure 4 shows that the equivalent circuit diagram of mode of operation 3.
Mode of operation 4: in the final stage of mode of operation 3, i.e. inductance L 2electric current I l2drop to Z source network output current I ia half, i.e. I l2=I i/ 2, open switching tube S a1, make Z source network input current I inbe less than zero, namely input current can reverse flow.Now, Z source network input current I in, Z source network output current I iand inductance L 2electric current I l2the condition met is such as formula shown in (III):
（Ⅲ）。
Figure 5 shows that the equivalent circuit diagram of mode of operation 4.
Mode of operation 5: in the final stage of mode of operation 4, inductance L 2electric current I l2continue to decline, until inductance L 2electric current I l2drop to zero then oppositely, Z source network electric capacity C 1with electric capacity C 2electric discharge, and DC side storage capacitor C is in charging.Now, switching tube S a1be in opening state, Z source network input current I in, Z source network output current I iand inductance L 2electric current I l2the condition met is such as formula shown in (IV):
（Ⅳ）。
Figure 6 shows that the equivalent circuit diagram of mode of operation 5.
Mode of operation 6: three phase inverter bridge is operated in traditional nought state, i.e. I i=0.Now, switching tube S a1still conducting, inductance L 2electric current I l2with Z source network input current I inbe all reverse flow, Z source network and load depart from completely.Figure 7 shows that the equivalent circuit diagram of mode of operation 6.
Mode of operation 7: under three phase inverter bridge is operated in straight-through nought state, the capacitance voltage sum of Z source network is than voltage source voltage V 0greatly, i.e. V c1+ V c2> V 0, Boost circuit diode VD 0reverse-biased shutoff, meanwhile, switching tube S a1also be in off state, Z source network electric capacity is to induction charging.Pass-through state has the following two kinds form: (1) in the final stage of mode of operation 6, after adding through connect signal, switching tube S a1turn off, inductance L 2electric current I l2can not suddenly change, the whole conducting of inverse parallel fly-wheel diode of three phase inverter bridge breaker in middle pipe, as shown in Figure 8; (2) inductance L 2electric current I l2after negative sense is reduced to zero, the conducting under the effect of through connect signal of the switching tube in three phase inverter bridge, as shown in Figure 9.

Claims (3)

1. be applicable to a Z-source inverter for photovoltaic generation, it is characterized in that, comprise Boost circuit, DC side storage capacitor C, switching tube S a1and anti-paralleled diode VD a1, Z source network, three phase inverter bridge, photovoltaic array, Boost circuit, DC side storage capacitor C, switching tube S a1and anti-paralleled diode VD a1, Z source network, three phase inverter bridge, load connect in turn, the direct current energy that photovoltaic array exports is transformed into AC energy, and is load supplying; Boost circuit comprises photovoltaic side storage capacitor C 0, Boost boost inductance L 0, Boost circuit switching tube S 0, Boost circuit diode VD 0, photovoltaic array and photovoltaic side storage capacitor C 0be connected in parallel, photovoltaic array output cathode and Boost boost inductance L 0be connected, Boost boost inductance L 0the other end and Boost circuit switching tube S 0collector electrode, Boost circuit diode VD 0anode be connected, Boost circuit diode VD 0negative electrode and one end of DC side storage capacitor C, diode VD a1negative electrode, switching tube S a1collector electrode be connected, the other end of DC side storage capacitor C and Boost circuit switching tube S 0emitter, photovoltaic array output negative pole be connected; Z source network comprises inductance L 1, inductance L 2, electric capacity C 1, electric capacity C 2, inductance L 1, electric capacity C 2, inductance L 2, electric capacity C 1be connected to form series loop successively, inductance L 1with electric capacity C 1with switching tube S while of junction a1emitter, diode VD a1anode be connected, electric capacity C 2with inductance L 2junction is connected with photovoltaic array output negative pole simultaneously; Three phase inverter bridge comprises six switching tube S 1~ S 6and their respective anti-paralleled diode VD 1~ VD 6, switching tube S 1, S 3, S 5collector electrode be connected, as the input anode of three phase inverter bridge, and with inductance L in Z source network 1with electric capacity C 2junction be connected; Switching device S 2, S 4, S 6emitter be connected, as the input negative terminal of three phase inverter bridge, and with inductance L in Z source network 2with electric capacity C 1junction be connected; S 1emitter and S 2collector electrode be connected, S 3emitter and S 4collector electrode be connected, S 5emitter and S 6collector electrode be connected, by S 2, S 4, S 6collector electrode draw a, b, c tri-outputs of three phase inverter bridge respectively and be connected to load.
2. a kind of Z-source inverter being applicable to photovoltaic generation according to claim 1, is characterized in that, in Z source network, and inductance L 1with inductance L 2inductance value equal, electric capacity C 1with electric capacity C 2capacitance equal.
3. a kind of Z-source inverter being applicable to photovoltaic generation according to claim 1, it is characterized in that, the model of three phase inverter bridge is FF450R17ME4.
CN201520354195.XU 2015-05-28 2015-05-28 A kind of Z-source inverter being applicable to photovoltaic generation Expired - Fee Related CN204696953U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105242741A (en) * 2015-10-16 2016-01-13 王水平 Solar generation power control device and method based on solar optimizer
CN106253721A (en) * 2016-08-04 2016-12-21 上海交通大学 The boosting asymmetric control circuit of the resonator system with Z source network and method
CN109842313A (en) * 2019-03-07 2019-06-04 广东工业大学 A kind of quasi- z source inventer of switching boost type

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105242741A (en) * 2015-10-16 2016-01-13 王水平 Solar generation power control device and method based on solar optimizer
CN106253721A (en) * 2016-08-04 2016-12-21 上海交通大学 The boosting asymmetric control circuit of the resonator system with Z source network and method
CN109842313A (en) * 2019-03-07 2019-06-04 广东工业大学 A kind of quasi- z source inventer of switching boost type

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