CN206517317U - A kind of single-phase grid-connected inverter topological structure - Google Patents
A kind of single-phase grid-connected inverter topological structure Download PDFInfo
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Abstract
A kind of single-phase grid-connected inverter topological structure, power supply VinPositive pole respectively with the first power switch tube S1Drain electrode, the 3rd power switch tube S3Drain electrode connection, the first power tube S1Source electrode and inductance L1One end, electric capacity C1One end connection, inductance L1The other end and power supply VinNegative pole connection, electric capacity C1The other end and the second power switch S2Drain electrode and common portion connection, the second power switch S2Source electrode and power supply VinNegative pole is connected；3rd power tube S3Source electrode and inductance L2One end, electric capacity C2One end connection, inductance L2The other end and power supply VinNegative pole connection, electric capacity C2The other end and the 4th power switch S4Drain electrode and common portion connection, the 4th power switch S4Source electrode and power supply VinNegative pole is connected.The utility model topological structure only utilizes dutycycle and two groups of capacitor and inductors, completes direct current to the buck of exchange.
Description
Technical field
A kind of single-phase grid-connected inverter topological structure of the utility model, is related to new energy power generation grid-connection technical field.
Background technology
As the quick consumption of fossil fuel, and the environmental pollution brought therefrom increasingly sharpen.Regenerative resource
Developing and utilizing increasingly causes people widely to note.And, it is necessary to use DC-AC during new energy power generation grid-connection
Converter (inverter), and converter needs to access different DC voltage levels as input.And the usual work of DC-AC inverter
Make under pressure-lowering condition, be more than output voltage if necessary to output voltage, it is necessary to use buck-boost inverters, this will
Ask using a middle power stage or transformer, so will be very complicated using the DC-AC converters of this circuit.One is
Topological structure can complicate, and two be that converter volume can increase.Meanwhile, have to when grid-connected need in view of the output of inverter
Kept with power network with frequency, same to phase, this just proposes higher requirement, it is necessary to be solved using new technology to corresponding PHASE-LOCKED LOOP PLL TECHNIQUE
Harmonic problem, it is ensured that distribution hair point access power grid operation.
The content of the invention
The utility model provides a kind of single-phase grid-connected inverter topological structure, and the topological structure only utilizes dutycycle and two
Group capacitor and inductor, completes direct current to the buck of exchange；This method can detect actual phase, and take into account the dynamic of system
State property energy and stability.
The technical scheme that the utility model is taken is：
A kind of single-phase grid-connected inverter topological structure, DC/AC inverters include power supply Vin, inductance Lf, electric capacity Cf, load electricity
Hinder R0；
First power switch S1, the second power switch S2, the 3rd power switch S3, the 4th power switch S4；
First diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4；
Electric capacity C1, electric capacity C2, inductance L1, inductance L2；
Power supply VinPositive pole respectively with the first power switch tube S1Drain electrode, the 3rd power switch tube S3Drain electrode connection,
First power tube S1Source electrode and inductance L1One end, electric capacity C1One end connection, inductance L1The other end and power supply VinNegative pole
Connection, electric capacity C1The other end and the second power switch S2Drain electrode and common portion connection, the second power switch S2Source electrode
With power supply VinNegative pole is connected；3rd power tube S3Source electrode and inductance L2One end, electric capacity C2One end connection, inductance L2It is another
One end and power supply VinNegative pole connection, electric capacity C2The other end and the 4th power switch S4Drain electrode and common portion connection,
4th power switch S4Source electrode and power supply VinNegative pole is connected；
Common portion is by inductance LfWith electric capacity CfThe high frequency filter and load resistance R of composition0Composition, inductance LfSide
With electric capacity C1The other end connection, inductance LfOpposite side and electric capacity CfOne end and load resistance R0One end connection, electric capacity
CfOne end and inductance LfConnection, electric capacity CfOpposite side and electric capacity C2The other end and load resistance R0The other end connection.
A kind of single-phase grid-connected inverter topology merging method, the first power switch tube S1With the 3rd power switch tube S3
For a pair, the 4th power switch tube S4With the second power switch tube S2For a pair；
In t1Before moment, work as S1, S4Turn on, afterwards inductance L1Start to charge up, inductance L2Start electric discharge, electric capacity C2Start to fill
Electricity, electric capacity C1Start electric discharge, output voltage is Ud；
t1Moment S3、S4Reversely, electric current can not be mutated signal, S3It can not turn on immediately, D3Afterflow is turned on, because S1With
D3Simultaneously turn on, so output voltage is zero；
To t2Moment S1、S2Signal reversely, S1Cut-off, and S2It can not turn at once, D2Turn on afterflow, and S3Constitute
Current channel, L1Start electric discharge, C1Start to charge up, L2Start to charge up, C2Start electric discharge, output voltage is-Ud, it is to load current
After zero and when starting reverse, D2And D3Cut-off, S2And S3Conducting, output voltage is still-Ud；
t3Moment S3、S4Signal is reverse again, S3Cut-off, and S4Do not turn on immediately, D4Afterflow is turned on, output voltage is again
Secondary is zero；
Later process with it is above similar；
By the control to dutycycle, and two groups of electric capacity C of each moment1、C2Two groups of inductance L1、L2Discharge and recharge electricity
Pressure size is controlled, and realizes the lifting of voltage, and converter can complete conversion of the input for direct current to exchange.
A kind of single-phase grid-connected inverter topological structure of the utility model, advantage is：
1：The inverter that the utility model is provided, using transless structure, small volume, reliability is high；Converter energy consumption
It is small, buck is completed using two groups of switch elements and two groups of voltage inductance, can be obtained than direct current input more using dutycycle
High exchange output.
2：The utility model topological structure, only completes direct current to the lifting exchanged using dutycycle with two groups of capacitor and inductors
Pressure.
3：A kind of single-phase phase-locked loop new algorithm based on synchronous rotating angle of the utility model, can be detected
Actual phase, and take into account the dynamic property and stability of system.
4：The utility model employs PR controls, and system has more preferable anti-net voltage disturbance performance.
Brief description of the drawings
Fig. 1 is general structure block diagram of the present utility model.
Fig. 2 is converter topology structure chart of the present utility model.
Fig. 3 is single-phase phase-locked loop new algorithm block diagram of the present utility model.
Fig. 4 is combining inverter control structure figure of the present utility model.
Fig. 5 is switching time table figure of the present utility model.
Embodiment
A kind of grid-connected frame diagram of single-phase grid-connected inverter topology, as shown in Figure 1.The input of DC/AC inverters and distribution
Formula power supply is connected, and the connection of the output end and power network of DC/AC inverters, in the input/output terminals of DC/AC inverters has voltage electricity
Flow detection device, voltage and current detecting device is connected with inverter control system.
DC/AC inverters include two inductance, two electric capacity, four power switch, four diodes, high frequency filter groups
Into transformer configuration is as shown in Figure 2.The combination method is public electric wire net voltage, actual grid-connected current and the power network of directly sampling
Feed-forward voltage, is given DSP using these sampled values as control benchmark, is become by DSP according to one kind based on synchronously rotating reference frame together
The single-phase phase-locked loop new algorithm changed is calculated and output pwm signal, and four power switch work of inverter bridge, inverter are driven respectively
The grid-connected current of output will preferably track reference electric current, and kept all the time with line voltage with the same phase of frequency, so that realize can
The renewable sources of energy are with High Power Factor feedback grid.Wherein DSP uses TMS320LF2407 for Master control chip, with disposal ability
More preferably, peripheral hardware integrated level is higher, memory span bigger, A/D conversion speeds faster the features such as.Voltage x current sampling module is adopted
Sampled with the voltage-current sensor from LEM companies.
As shown in Fig. 2 a kind of single-phase grid-connected inverter topological structure, DC/AC inverters include power supply Vin, inductance Lf, electricity
Hold Cf, load resistance R0。
First power switch S1, the second power switch S2, the 3rd power switch S3, the 4th power switch S4；
First diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4；
Electric capacity C1, electric capacity C2, inductance L1, inductance L2；
Power supply VinPositive pole respectively with the first power switch tube S1Drain electrode, the 3rd power switch tube S3Drain electrode connection,
First power tube S1Source electrode and inductance L1One end, electric capacity C1One end connection, inductance L1The other end and power supply VinNegative pole
Connection, electric capacity C1The other end and the second power switch S2Drain electrode and common portion connection, the second power switch S2Source electrode
With power supply VinNegative pole is connected；3rd power tube S3Source electrode and inductance L2One end, electric capacity C2One end connection, inductance L2It is another
One end and power supply VinNegative pole connection, electric capacity C2The other end and the 4th power switch S4Drain electrode and common portion connection,
4th power switch S4Source electrode and power supply VinNegative pole is connected；
Common portion is by inductance LfWith electric capacity CfThe high frequency filter and load resistance R of composition0Composition, inductance LfSide
With electric capacity C1The other end connection, inductance LfOpposite side and electric capacity CfOne end and load resistance R0One end connection, electric capacity
CfOne end and inductance LfConnection, electric capacity CfOpposite side and electric capacity C2The other end and load resistance R0The other end connection.
A kind of single-phase grid-connected inverter topology merging method, the first power switch tube S1With the 3rd power switch tube S3
For a pair, the 4th power switch tube S4With the second power switch tube S2For a pair.
In t1Before moment, t may be regarded as0At the moment, work as S1, S4Turn on, afterwards inductance L1Start to charge up, inductance L2Start electric discharge,
Electric capacity C2Start to charge up, electric capacity C1Start electric discharge, output voltage is Ud。
t1Moment S3、S4Reversely, electric current can not be mutated signal, S3It can not turn on immediately, D3Afterflow is turned on, because S1With
D3Simultaneously turn on, so output voltage is zero.
To t2Moment S1、S2Signal reversely, S1Cut-off, and S2It can not turn at once, D2Turn on afterflow, and S3Constitute
Current channel, L1Start electric discharge, C1Start to charge up, L2Start to charge up, C2Start electric discharge, output voltage is-Ud, it is to load current
After zero and when starting reverse, D2And D3Cut-off, S2And S3Conducting, output voltage is still-Ud。
t3Moment S3、S4Signal is reverse again, S3Cut-off, and S4Do not turn on immediately, D4Afterflow is turned on, output voltage is again
Secondary is zero.
Later process with it is above similar.
By the control to dutycycle, and two groups of electric capacity C of each moment1、C2Two groups of inductance L1、L2Discharge and recharge electricity
Pressure size is controlled, and realizes the lifting of voltage, and converter can complete conversion of the input for direct current to exchange.
t0、t1、t2、t3Add up as a whole switch duty cycle, as shown in Figure 5.
A kind of grid-connected control method of single-phase grid-connected inverter topological structure, when grid-connected, when DSP is detecting line voltage just
During to zero crossing, start the single-phase phase-locked loop new algorithm based on synchronous rotating angle inside DSP, for a single-phase electricity
Net voltage Us, it is assumed that its mathematic(al) representation is：
Us=Umcos(ωt) (1)
In formula, UsFor single-phase mains voltage, UmVoltage magnitude is represented, ω represents angular frequency, and t represents the time.
If on the α axles for it being oriented in α β coordinate systems, and β axis signals are then directly forced to zero, the voltage so built
Vector may be considered the sum of two synchronous rotaries but the different voltage vector in direction, and such a voltage vector can be decomposed
For the sum of two synchronous rotaries but the different voltage vector in direction, i.e.,：
In formula, UsFor single-phase mains voltage, UmVoltage magnitude is represented, ω represents angular frequency, and t represents the time.
If the phase angle of the dq reference coordinates of estimation isDq rotation transformations are carried out, are obtained：
In formula, UdIt is voltage in the component of d axles, UqIt is voltage in the component of q axles, UmVoltage magnitude is represented, ω represents angular frequency
Rate, t represents the time,For the phase angle of dq reference coordinates.
When the system is stable, it is assumed that phase estimation valueClose to actual value θ, i.e.,Therefore, formula (3) can be write as
In formula, UdIt is voltage in the component of d axles, UqIt is voltage in the component of q axles, UmVoltage magnitude is represented, ω represents angular frequency
Rate, t represents the time,For the phase angle of dq reference coordinates,It is d axis components, represents the amplitude of input voltage, q axis componentsRepresent the phase of observation and the difference of actual phase.
Thus it is seen that the input voltage amplitude and phase information of decoupling needs can be solved after conversion, wherein：D axles point
Amount,Represent the amplitude of input voltage, and q axis componentsRepresent the phase of observation and the difference of actual phase.
Above-mentioned control algolithm is as shown in Figure 3.The phase locked track of mains frequency is thus realized, and passes through computing, will be produced
The input that is controlled as PR of signal, PR control structures are as shown in Figure 4.Because switching frequency (20kHz) is significantly larger than power network frequency
Rate, for the ease of analysis, ignores influence of the switch motion to system, is approximately gain link a K, G (s) by PWM inversion units
For system controller transmission function, R is inductance L series equivalent resistance, UgirdFor line voltage, IrefIt is same in line voltage
Frequency is with the grid-connected current reference signal of phase, and the transmission function such as formula (5) for releasing combining inverter output current is shown.
ILInductive current, K represents gain coefficient, and G (s) is system controller transmission function, and s is oneself of Laplace function
Variable, L is inductance value, and R is resistance value, UgirdFor line voltage, IrefIt is to join in line voltage with frequency with the grid-connected current of phase
Examine signal
PI controller transfer functions are：
GPI(s) PI controller transfer functions, k are representedpRepresent proportional gain factor, kiIntegration gain factor is represented, s is drawing
This argument of function of pula
PR controller transfer functions are：
GPR(s) PR controller transfer functions, k are representedpProportional gain factor is represented, s is the independent variable of Laplace function
krFor resonance gain coefficient, ω0For fundamental frequency
Inverter output current is relevant with reference current and line voltage it can be seen from formula (5), for PI controls, base
Wave frequency rate ω0Place controller gain be(kpProportional gain factor is represented, ki represents integration gain factor,
ω0Represent fundamental frequency) it is limited, therefore the Section 1 of formula (5) can be write as ε Iref(ε=1/ [1+ (sL+R) KG (s)], 0<|
ε|<1), (ILInductive current, K represents gain coefficient, and G (s) is system controller transmission function, and s is oneself of Laplace function
Variable, L is inductance value, and R is resistance value, UgirdFor line voltage, IrefIt is to join in line voltage with frequency with the grid-connected current of phase
Examine signal, ε is the calculated value of the Section 1 of formula (5)) i.e. output current is less than reference current, and there is steady-state error in system；Similarly,
2nd is not influenceed for 0, i.e. output current by line voltage.For PR controls, controller is in fundamental frequency ω0The gain at place is(kpRepresent proportional gain factor, krFor resonance gain coefficient, ω0For fundamental frequency) become
In infinity, therefore, the 1st of formula (5) is substantially equal to Iref；Similarly, the 2nd tends to 0, now, there is IL=Iref, realize pair
The zero steady-state error tracking of sinusoidal current reference signal, and influence of the voltage ripple of power network to grid-connected current can be suppressed.
PR controllers generate voltage control instructions, and the command voltage is converted into after exchange command voltage, is admitted to PWM
Unit generation pwm signal is sent to combining inverter, so as to control cut-offfing for power device, produces actually required alternating voltage, and
Follow grid-connected current and refer to value changes；Inverter input terminal is that sampled data is passed to DSP by voltage sample module, works as detection
Exceed the nominal input voltage of inverter to voltage, would not carry out and net operation；This completes grid-connected all operations.
Claims (1)
1. a kind of single-phase grid-connected inverter topological structure, it is characterised in that：DC/AC inverters include power supply Vin, inductance Lf, electric capacity
Cf, load resistance R0；
First power switch S1, the second power switch S2, the 3rd power switch S3, the 4th power switch S4；
First diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4；
Electric capacity C1, electric capacity C2, inductance L1, inductance L2；
Power supply VinPositive pole respectively with the first power switch tube S1Drain electrode, the 3rd power switch tube S3Drain electrode connection, the first work(
Rate pipe S1Source electrode and inductance L1One end, electric capacity C1One end connection, inductance L1The other end and power supply VinNegative pole connection,
Electric capacity C1The other end and the second power switch S2Drain electrode and common portion connection, the second power switch S2Source electrode with electricity
Source VinNegative pole is connected；3rd power tube S3Source electrode and inductance L2One end, electric capacity C2One end connection, inductance L2The other end
With power supply VinNegative pole connection, electric capacity C2The other end and the 4th power switch S4Drain electrode and common portion connection, the 4th
Power switch S4Source electrode and power supply VinNegative pole is connected；
Common portion is by inductance LfWith electric capacity CfThe high frequency filter and load resistance R of composition0Composition, inductance LfSide and electric capacity
C1The other end connection, inductance LfOpposite side and electric capacity CfOne end and load resistance R0One end connection, electric capacity CfOne
End and inductance LfConnection, electric capacity CfOpposite side and electric capacity C2The other end and load resistance R0The other end connection.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487267A (en) * | 2016-12-26 | 2017-03-08 | 三峡大学 | A kind of single-phase grid-connected inverter topological structure and its control method |
| CN113838348A (en) * | 2021-06-17 | 2021-12-24 | 北方工业大学 | Demonstration teaching aid based on DC-DC topological current decoupling |
-
2016
- 2016-12-26 CN CN201621437663.0U patent/CN206517317U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487267A (en) * | 2016-12-26 | 2017-03-08 | 三峡大学 | A kind of single-phase grid-connected inverter topological structure and its control method |
| CN113838348A (en) * | 2021-06-17 | 2021-12-24 | 北方工业大学 | Demonstration teaching aid based on DC-DC topological current decoupling |
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Granted publication date: 20170922 Termination date: 20181226 |