CN112737293B - Control method of non-isolated integrated boost DC/AC converter - Google Patents
Control method of non-isolated integrated boost DC/AC converter Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
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- 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
Abstract
The invention discloses a non-isolated integrated boost DC/AC converter and a control method thereof, belonging to the technical field of power electronic converters. The invention comprises a power switch tube S1、S2、S3And S4Diode D, inductor LinAnd a capacitor C1(ii) a One end of the DC side of the converter and an inductor LinIs connected to an inductor LinThe other end of the first diode is connected with the anode of a diode D, and the cathode of the diode D is respectively connected with a power switch tube S1And S3Terminal 1 and capacitor C1One terminal of (C), a capacitor1The other ends of the two are respectively connected with a power switch tube S2And S4A terminal 2; the other end of the DC side, a power switch tube S1Terminal 2, power switch tube S2The terminal 1, and one end of the AC side are grounded; power switch tube S3Terminal 2 and power switch tube S4The terminal 1 is connected to the other end on the ac side. Aiming at the problem of leakage current of the traditional boost inverter, the boost inverter has high integration level and small volume, and can effectively solve the problem of leakage current.
Description
Technical Field
The invention relates to the technical field of power electronic converters, in particular to a non-isolated integrated boost DC/AC converter and a control method thereof.
Background
Under the background of increasingly tense global energy supply, clean, environment-friendly and noiseless solar photovoltaic power generation is generally regarded by all countries in the world. Wherein the inverter is a key interface device in the photovoltaic power generation system. At present, a non-isolated photovoltaic power generation system without a transformer is a hotspot researched by broad students due to the characteristics of small volume, light weight, low cost, easiness in installation and the like. However, the conventional non-isolated inverter lacks electrical isolation of the transformer, and due to the existence of parasitic capacitance of the photovoltaic cell to the ground, leakage current is easily generated in the photovoltaic power generation system, which leads to problems of increased loss, safety, electromagnetic interference (EMI), and the like, thereby reducing the overall performance of the photovoltaic power generation system.
In addition, under normal conditions, the output direct-current voltage of new energy modules such as photovoltaic modules and fuel cells is generally 18-56V, and in order to meet the requirements of electric equipment or grid-connected power generation, battery modules with lower voltage need to be connected in series, or the voltage of the battery modules is raised to a certain degree through a single-stage direct-current boost converter, and then energy conversion is carried out through a traditional bridge inverter to form a two-stage inverter. If a plurality of modules are connected in series, a barrel effect is easily formed, and the reliability of the system is reduced. If photovoltaic power generation is carried out by a cascade structure formed by two stages of converters, the number of required power devices is increased, and meanwhile, the transmission efficiency of the system is influenced by two-stage power processing.
In recent years, in order to solve the problem of leakage current of a photovoltaic inverter, a great number of studies have been made by domestic and foreign scholars on constructing a physical structure, a control method and the like of a novel inverter. Document H6 Transformerless Full-Bridge PV Grid-Tied Inverters IEEE2014, which adds two active switches and two diodes on the basis of a Full-Bridge inverter, proposes an H6 inverter structure, wherein the circuit operates in a freewheeling stage of positive and negative half cycles, and the direct current side and the alternating current side are disconnected, thereby inhibiting the generation of leakage current. However, when the circuit is used for normally transmitting energy, two active switches and one diode are required to simultaneously work in a high-frequency state, so that the complexity, the cost and the loss of the circuit are increased.
Document "a New High-Efficiency Single-Phase transform PV Inverter Topology" IEEE2011 discloses a Single-stage Inverter, which is a full-bridge Inverter Topology with an ac bypass. The midpoint of the dc link is clamped by a diode and a bi-directional switch. The working principle is the same as that of HERIC topology. Three-level output voltage is realized by adopting unipolar SPWM modulation. The disadvantage of this topology is that it requires increased dead time and increased distortion of the output current. The starting point of the inverter is to reduce leakage current in photovoltaic array voltage conversion, the number of switching devices is large, the size of a circuit is increased, loss is large, and the efficiency of the inverter is reduced.
Disclosure of Invention
1. Technical problem to be solved by the invention
Aiming at the problem that a boosting inverter in the prior art is low in boosting ratio, the invention provides a non-isolated integrated boosting DC/AC converter. The converter has high integration level and high boosting transformation ratio, can effectively solve the problem of high-frequency leakage current, and further has a simplified control scheme compared with the conventional circuit structure.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to a non-isolated integrated boost DC/AC converter, which comprises a power switch tube S1、S2、S3And S4Diode D, inductor LinAnd a capacitor C1；
Inductor LinOne end is connected with an input power supply UinOne terminal, inductor LinThe other end is connected with the anode of the diode D;
the cathodes of the diodes D are respectively connected with a power switch tube S1And S3Terminal 1 and capacitor C1One terminal of (C), a capacitor1The other ends of the two are respectively connected with a power switch tube S2And S4A terminal 2;
input power supply UinAnother terminal of (1), a power switch tube S1Terminal 2, power switch tube S2The terminal 1, and one end of the AC side are grounded;
power switch tube S3Terminal 2 and power switch tube S4The terminal 1 is connected with the other end of the alternating current side;
power switch tube S 32 terminal and power switch tube S4The 1 end of the node A is connected with the node A;
power switch tube S 12 terminal and power switch tube S2The 1 end of the node B is connected with the node B;
nodes a and B form the output.
Wherein, the power switch tube S1、S2、S3And S4Are connected in anti-parallel with the diode.
Preferably, the system further comprises a filter, and the nodes A and B and the input of the filterThe input end is connected, and the output end of the filter is connected with a power grid or a load RO。
Preferably, said filter is of the LC type, comprising a filter inductance LoAnd a filter capacitor CoFilter inductance LoOne end of the filter inductor L is connected with the node AoThe other end and a filter capacitor CoOne end and a power grid or load ROOne end connected to a filter capacitor CoThe other end and the network or load ROAnd the other end is connected with the node B.
The invention discloses a control method of a non-isolated integrated boost DC/AC converter, which is characterized by comprising the following steps: the working principle in the positive and negative half waves of the sine modulation wave is the same;
when the modulation wave is larger than the carrier wave, the power switch tube S is controlled1、S4Conduction, S2、S3Cut off, diode D is conducted, and input power UinFor inductor LinCharging; capacitor C1Voltage U acrossC1And the output voltage uoA closed loop is formed, when the output voltage amplitude Uom＝-mUC1Wherein m is the modulation ratio;
when the modulated wave is less than the carrier wave, the power switch tube S is controlled2、S3Conduction, S1、S4The diode D is kept on when the power is cut off, and the power is input into the power supply UinAnd an inductance L1Is a capacitor C1Charging; input power supply UinInductor LinDiode D and output voltage uoForming a closed loop; capacitor C1Voltage U acrossC1For the network or the load ROSupplying power, the output voltage amplitude Uom＝+mUC1(ii) a Inductor L1In a discharge state and a current interruption state, flows through the inductor L1Current i ofL1Linearly decreases until it reaches zero, the diode D is cut off, and the capacitor C1Voltage U acrossC1And the output voltage uoForming a closed loop; at this time, the output voltage Uom＝+mUC1。
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) according to the non-isolated integrated boost DC/AC converter, the DC side and the AC side are grounded together, so that common mode interference is avoided, and high-frequency leakage current does not exist;
(2) the non-isolated integrated boost DC/AC converter belongs to an integrated inverter, and utilizes the multiplexing technology of power devices, thereby obviously reducing the number of elements of the inverter, reducing the system cost, improving the integration level and having small circuit occupation space;
(3) according to the modulation method of the converter, at most two power switching tubes work in each working mode, so that the conduction loss of the switching tubes is reduced;
(4) the modulation method of the converter has high boosting capacity, can realize boosting and inverting functions by controlling the on and off of the 4 power switching tubes S1 to S4, converts and outputs the voltage of the solar panel, and has the advantages of less circuit components, simple circuit structure, high electric energy conversion efficiency and the like;
(5) compared with the circuit structures for restraining high-frequency leakage current such as H6 and the like, the non-isolated integrated boost DC/AC converter has the advantages of simple circuit structure, simple control scheme, few power devices, high efficiency, low cost, small switching loss, long service life, high integration level and the like;
(6) in the traditional two-stage series boost inverter, the output end of the front stage boost converter needs to be provided with a filter, the output end of the rear stage inverter also needs to be provided with a filter, the filter occupies a large space, the design is complicated, the volume of the whole circuit and the circuit design cost are increased undoubtedly, and the single-stage boost inverter creatively overcomes the defects, only one filter is needed, and the occupied space is small.
Drawings
Fig. 1 is a schematic circuit configuration diagram according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of driving waveforms of the power switching tubes in embodiments 1 to 2 of the present invention.
Fig. 3 is a diagram illustrating an operation mode distribution in a switching cycle in DCM according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a first mode of operation of the present invention.
Fig. 5 is a schematic diagram of a second mode of operation of the present invention.
Fig. 6 is a schematic diagram of the third mode of operation of the present invention.
FIG. 7 is a waveform illustrating the inductor current simulation in the full DCM of one embodiment of the present invention.
FIG. 8 is a schematic diagram of voltage at node AB and output voltage and current waveforms according to one embodiment of the present invention.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
The voltage at the output of the filter, i.e. the voltage across the network, is denoted as the output voltage uoCorresponding to an output voltage amplitude of Uom(ii) a The voltage between nodes A and B is denoted uAB(ii) a Power switch tube S1、S2、S3And S4An IGBT or other power switching tube such as a MOSEFET may be used. When using IGBT, the power switch tube S1、S2、S3And S4The 1 end, the 2 end and the 3 end respectively correspond to a power switch tube S1、S2、S3And S4Collector, base and emitter of (1), when using a MOSEFET, a power switch tube S1、S2、S3And S4The 1 end, the 2 end and the 3 end respectively correspond to a power switch tube S1、S2、S3And S4A drain, a gate and a source.
Example 1
As shown in fig. 1, the non-isolated integrated boost DC/AC converter of this embodiment includes a power switch S1、S2、 S3And S4Diode D, inductor LinAnd a capacitor C1；
Inductor LinOne end is connected with an input power supply UinOne terminal, inductor LinThe other end is connected with the anode of the diode D;
the cathodes of the diodes D are respectively connected with a power switch tube S1And S3Terminal 1 and capacitor C1One terminal of (C), a capacitor1The other ends of the two are respectively connected with a power switch tube S2And S4The terminal 2 of (1);
input power supply UinAnother terminal of (1), a power switch tube S1Terminal 2 of power switch tube S2And one end of the ac side is grounded;
power switch tube S3Terminal 2 and power switch tube S4The terminal 1 is connected with the other end of the alternating current side;
power switch tube S3Terminal 2 and power switch tube S4Terminal 1 of is connected to node a;
power switch tube S1Terminal 2 and power switch tube S2Terminal 1 of which is connected to node B; nodes a and B form the output.
Wherein, the power switch tube S1、S2、S3And S4Are connected in anti-parallel with the diode.
The inverter is different from a boost inverter formed by a series combination of a boost converter and an inverter in the prior art, the inventor of the application creatively provides a non-isolated integrated boost DC/AC converter by utilizing a power device multiplexing technology, overcomes the defects of the traditional two-stage inverter, completes the boost process while inverting, reduces the number of components, especially reduces the number of power devices, thereby reducing the switching loss and the cost, and has the advantages of high integration level, small volume, high boost ratio and simple and convenient control mode.
Example 2
As shown in fig. 1, in the non-isolated integrated step-up DC/AC converter of this embodiment, based on embodiment 1, the DC side is the DC power UinThe photovoltaic cell panel output voltage and alternating current side filter is of an LC type and comprises a filter inductor Lo and a filter capacitor Co, one end of the filter inductor Lo is connected with a node A, and the other end of the filter inductor Lo is connected with the filter capacitor CoOne end of the capacitor Co and a power grid or a load ROOne end of the filter capacitor Co is connected, and the other end of the filter capacitor Co is connected with a power grid or a load ROAnd the other end is connected with the node B. Filter pair voltage UABFiltering is performed to remove harmonic interference, the filtering can be selected according to an actual application scene, and the filtering can be an LC filter (as shown in fig. 1), an LCL filter, and the like, the output of the filter can be connected to a power grid or a load, the load characteristic can also be selected according to the actual application scene, and the filtering can be a resistive load, an inductive load, a capacitive load, and the like, and when the load is not a resistive load, reactive compensation can be performed on the output of which the power factor is less than 1.
The embodiment completes the voltage boosting inversion, and the output end of the filter, namely the output voltage uoDirectly to the load RoSupply power, or output voltage uoFeeding back to the power grid.
The embodiment also comprises a control method of the non-isolated integrated boost inverter, which is used for supplying power to the power switch tube S1、S2、S3And S4The gate of the power switch tube is input with a control signal, the waveform of which is shown in figure 2, and the power switch tube S is arranged from top to bottom in sequence1、S4And S2、S3The gate pole of the boost Inverter inputs a control signal, only two switching tubes work simultaneously in any mode, compared with a reference of ANew High-Efficiency Single-Phase transformation PV Inverter Topology in the background technology, dead time does not need to be increased, the quality of an output waveform is improved, in addition, the number of the power switching tubes in the reference is two more than that in the application, the volume of the boost Inverter is undoubtedly increased, switching loss is increased, and the conversion Efficiency and the service life of the whole boost Inverter are further reduced; the circuit structure of the non-isolated integrated boost DC/AC converter solves the problems creatively, the working modes of the converter comprise a mode I, a mode II and a mode III, and the detailed conditions are as follows:
mode one
In conjunction with fig. 1 and 2, when the modulated wave is larger than the carrier wave, the power switch S is controlled as shown in fig. 41、S4Conduction, S2、 S3The diode D is turned off and is turned on; input power supply UinInductor LinDiode D and power switch tube S1Form a closed loop to input power UinTo the inductance LinCharging, flowing through the inductor LinCurrent i ofLinIncreases linearly from zero; capacitor C1Power switch tube S1Filter and power switch tube S4Forming a closed loop, a capacitor C1Voltage U acrossC1To the network or to the load ROSupplying power, at which time the output voltage amplitude U isom＝-mUC1Wherein m is the modulation ratio;
mode two
When the modulated wave is smaller than the carrier wave, as shown in fig. 5, the power switch tube S is controlled in conjunction with fig. 1 and 22、S3Conduction, S1、 S4Cut off, diode D is conducted, and input power UinInductor LinDiode D and capacitor C1And a power switch tube S2Form a closed loop to input power UinAnd an inductance LinIs a capacitor C1Charging; input power supply UinInductor LinDiode D and power switch tube S3Forms a closed loop with the filter, and inputs the power supply UinAnd an inductance LinTo the network or to the load ROSupply of power, at which time the output voltage amplitude Uom＝+mUC1(ii) a Inductor LinIn the discharge state and the current interruption state, as shown in FIG. 7, flows through the inductor LinCurrent i ofLinLinearly reducing until the linear reduction reaches zero, and cutting off the diode D to form a third mode;
modal three
With reference to fig. 1 and 2, the power switch S is controlled2、S3Conduction, S1、S4Off and the diode D is turned off as shown in fig. 6. Capacitor C1Power switch tube S3Filter and power switch tube S2Forming a closed loop, a capacitor C1Voltage U acrossC1To the network or to the load ROSupply of power, at which time the output voltage amplitude Uom＝+mUC1
The working principle of the converter in the positive and negative half waves of the sine modulation wave is the same,the method is continuously repeated according to the sequence of the mode I, the mode II and the mode III, wherein in the mode I, a closed loop is formed by utilizing the unidirectional conduction function of a diode D, and a power supply U is inputinThe stored electrical energy is transferred to the inductor LinAt the same time, by controlling the power switch tube S1、S4Conducting the capacitor C1The electric energy is transferred to an output end and forms an output voltage u through the modulation and filtering action of a filtero(ii) a In the second mode, the diode D is reused to conduct in one direction to form a closed loop, and the power supply U is inputinAnd an inductance LinForward capacitor C1Charging by controlling the power switch tube S2、 S3Is conducted to input power UinElectric energy and inductance LinThe electric energy is transferred to an output end and forms an output voltage u through the modulation and filtering action of a filtero。
To simplify the inverter analysis, the following assumptions are made:
(1) all semiconductor power devices are ideal devices, and D is an anti-reverse diode of an input photovoltaic cell.
(2) Capacitor C1Large enough to keep its voltage constant during one switching cycle; filter inductance LoSufficiently large that, during a switching cycle, the current remains constant during a switching cycle.
(3) Inductor LinOperates in Discontinuous Conduction (DCM) mode.
Suppose a power switch tube S1The ratio of the on-time to the switching period is the duty cycle DiAccording to the regular symmetric sampling rule, the duty ratio can be obtained as follows:
in the range of 0 to DiT time, power switch tube S1Open, i.e. in the state of mode one:
at DiT-(Di+Di') T time, power switch tube S1Off, i.e. in the state of modality two:
wherein iLinFor flowing through the energy storage inductor LinUpper current, UinFor inputting power, UC1For an energy-storage capacitor C1Voltage across, T being the switching period, Di' is the off duty cycle; since the boost inverter of the present application operates in the inductive discontinuous conduction mode, it is apparent that Di+Di’<From the volt-second equilibrium, one can obtain:
UinDiT＝(UC1-Uin)Di'T (4)
for an inverter circuit, if all component losses in the circuit are ignored, the input power is equal to the output power, so that:
wherein, UomIs the amplitude of the inverter output voltage, Uom＝mUC1；
Since the input average current is equal to the inductor average current, namely:
Iin＝ILin (6)
wherein, IinIs the input average current.
And an inductance LinThe average value of the current above is:
effective value U of output voltage of invertergComprises the following steps:
the relationship between the input voltage and the output voltage amplitude is:
by comparison, the working principle of the non-isolated integrated boost DC/AC converter of the embodiment is different from the boost inversion mode of the combination of the traditional boost converter and the inverter, and mainly includes the following points:
1. the non-isolated integrated boost DC/AC converter is integrated and single-stage, the problem of mutual matching between the output end of the boost converter and the input end of the inverter does not need to be considered, and the integration level is high;
2. the non-isolated integrated boost DC/AC converter of the embodiment does not have the problem that the traditional two-stage series boost inverter also needs to consider the matching of the output of the front stage and the input of the rear stage, thereby reducing the design cost;
3. the output end of a preceding stage boost converter of a traditional two-stage series boost inverter needs to be provided with a filter, the output end of a later stage inverter also needs to be provided with the filter, the filter occupies a large space and is complex in design, the volume of the whole circuit and the circuit design cost are undoubtedly increased, the non-isolated integrated boost DC/AC converter of the embodiment overcomes the defects, only one filter is needed, and the occupied space is small;
4. compared with a boosting inversion mode combining some boosting converters and full-bridge inverter circuits, the boosting inverter has the advantages that the number of power switching tubes is small, and the boosting ratio is large finally by controlling the on-off action of the combination of the diodes and the power switching tubes to form modes from one to three;
5. the control circuit of the power switching tube of the non-isolated integrated boost DC/AC converter is simple, convenient to design and low in cost, unlike a traditional two-stage series boost inverter, the front stage and the rear stage need to be controlled respectively, and the circuit design and control cost is high.
Compared with the defects that the H6 inverter has a more complex topological structure and high loss, the voltage gain is limited by the direct duty ratio and the modulation ratio, and the like, the method has the advantages of simple structure, high voltage gain, improved controllability of the DC bus voltage (voltage at two ends of the capacitor C1 in the embodiment) at the input side of the inverter, small switching loss and the like; compared to other single-stage boost inverters:
1. the non-isolated integrated boost DC/AC converter of the embodiment obviously reduces the number of elements by utilizing a power device multiplexing technology, reduces the system cost and improves the integration level;
2. when the single-phase integrated boost DC/AC converter is applied to a photovoltaic power generation field, the leakage current of a photovoltaic cell to the ground can be eliminated;
3. compared with the traditional two-stage boosting inverter, the problem of matching of front and rear stages is not required to be considered, the boosting ratio is greatly improved, and the voltage adjustable range is wide;
4. compared with the traditional booster circuit structure, the booster circuit has small inductance parameter, generates any expected output alternating voltage, particularly the voltage higher than the input voltage;
5. the THD of the output voltage/current is low;
6. the method for controlling the output voltage of the single closed loop has the advantages of simple structure, fast dynamic response, good tracking performance and stronger inhibition capability on the fluctuation of a power supply and a load.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (4)
1. A control method of a non-isolated integrated boost DC/AC converter is characterized in that: the non-isolated integrated boost DC/AC converter comprises a power switch tube S1、S2、S3And S4Inductance LinCapacitor C1A diode D; one end of the DC side and the inductor LinIs connected to an inductor LinThe other end of the first diode is connected with the anode of a diode D, and the cathode of the diode D is respectively connected with a power switch tube S1And S3Terminal 1 and capacitor C1One terminal of (C), a capacitor1The other ends of the two are respectively connected with a power switch tube S2And S4The terminal 2 of (1);
the other end of the DC side, a power switch tube S1Terminal 2 of power switch tube S2And one end of the ac side is grounded;
power switch tube S3Terminal 2 and power switch tube S4The terminal 1 is connected with the other end of the alternating current side;
power switch tube S3Terminal 2 and power switch tube S4Terminal 1 of is connected to node a;
power switch tube S1Terminal 2 and power switch tube S2Terminal 1 of which is connected to node B;
nodes a and B form an output;
wherein, the power switch tube S1、S2、S3And S4Are connected in anti-parallel with the diode at two ends;
wherein, the working principle in the positive and negative half waves of the sine modulation wave is the same;
when the modulation wave is larger than the carrier wave, the power switch tube S is controlled1、S4Conduction, S2、S3Cut off, diode D is conducted, and input power UinFor inductor LinCharging; capacitor C1Voltage U acrossC1And the output voltage uoForm a closed loop when the output voltage amplitude U isom＝-mUC1Wherein m is the modulation ratio;
when the modulated wave is smaller thanControlling the power switch tube S during carrier wave2、S3Conduction, S1、S4The diode D is kept on when the power is cut off, and the power is input into the power supply UinAnd an inductance L1Is a capacitor C1Charging; input power supply UinInductor LinDiode D and output voltage uoForming a closed loop; capacitor C1Voltage U acrossC1For the network or the load ROSupply of power, at which time the output voltage amplitude Uom＝+mUC1(ii) a Inductor LinIn a discharge state and a current interruption state, flows through the inductor LinCurrent i ofLinLinearly decreases until it reaches zero, the diode D is cut off, and the capacitor C1Voltage U acrossC1And the output voltage uoForming a closed loop; at this time, the output voltage amplitude Uom＝+mUC1。
2. The method for controlling a non-isolated integrated boost DC/AC converter according to claim 1, wherein: the capacitor C1Is a non-polar capacitor.
3. The method for controlling a non-isolated integrated boost DC/AC converter according to claim 1 or 2, wherein: the node A and the node B are connected with the input end of the filter, and the output end of the filter is connected with a power grid or a load RO。
4. The method for controlling a non-isolated integrated boost DC/AC converter according to claim 3, wherein: the filter is of LC type and comprises a filter inductor LoAnd a filter capacitor CoFilter inductance LoOne end of the filter inductor L is connected with the node AoThe other end and a filter capacitor CoOne terminal, grid or load ROOne end connected to a filter capacitor CoAt the other end, the network or the load ROAnd the other end is connected with the node B.
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| CN109980978A (en) * | 2019-04-01 | 2019-07-05 | 安徽工业大学 | A kind of converter and its modulator approach |
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