CN206790369U - Using the parallel three-level inverter circuit of carrier pulse modulation technique - Google Patents
Using the parallel three-level inverter circuit of carrier pulse modulation technique Download PDFInfo
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- CN206790369U CN206790369U CN201720455003.3U CN201720455003U CN206790369U CN 206790369 U CN206790369 U CN 206790369U CN 201720455003 U CN201720455003 U CN 201720455003U CN 206790369 U CN206790369 U CN 206790369U
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Abstract
The utility model discloses a kind of parallel three-level inverter circuit using carrier pulse modulation technique, the inverter circuit includes：Bleeder circuit, multiple three-phase tri-level inverter, current detection circuit, controller and drive modules.Direct current energy after partial pressure is converted to AC energy by the utility model under the driving of drive module respectively by multiple three-phase tri-level inverters, the feedback current that controller detects according to current detection circuit generates drive signal, and the drive signal is sent to the drive module, it is limited in one's ability so as to avoid single grid-connected inverters output current, switching frequency need not be increased, reduce the loss to device, avoid and the stability and security of grid-connection control system are threatened, in addition, it inductance value need not be increased still can reach and filter out ripple harmonic, the volume and cost of inverter circuit will not be increased.
Description
Technical field
Technical field of power generation is the utility model is related to, more particularly to it is a kind of using parallel the three of carrier pulse modulation technique
Level inverter circuit.
Background technology
The clean energy resource such as trend, photovoltaic, wind-force that generation of electricity by new energy turns into instantly popular is inexhaustible, pollutes small spy
Point, country's substantial increase photovoltaic installed capacity, some photovoltaic inversion devices or other distributed power source Parallel Operation on Power System
Harmonic effects are very big, and single grid-connected inverters output current is limited in one's ability, and current ripples are inversely proportional with device for power switching frequency,
Switching frequency will be increased by reducing ripple, and the loss to device accordingly increases, and easily cause the stabilization for threatening grid-connection control system
Property and security.
With the raising of combining inverter power, output current increase, original inductor will suitably increase by contrast
Big inductance value can be only achieved the effect for filtering out ripple harmonic, but can increase inverter volume, while increase cost.
The above is only used for auxiliary and understands the technical solution of the utility model, does not represent and recognizes that the above is existing
Technology.
Utility model content
Main purpose of the present utility model is to provide a kind of inverse using parallel three level of carrier pulse modulation technique
Become circuit, it is intended to solve the stability and security for threatening grid-connection control system in the prior art be present, and increase inverter
The technical problem of volume and cost.
To achieve the above object, the utility model provides a kind of inverse using parallel three level of carrier pulse modulation technique
Become circuit, the inverter circuit includes：Equalizer circuit, multiple three-phase tri-level inverter, current detection circuit, controller and drives
Dynamic model block；
The equalizer circuit, handled for carrying out pressure to the direct current energy of input, obtain DC side central point position, it is described
The N lines of DC side central point position and AC connect；
Each three-phase tri-level inverter parallel, it is respectively used to the direct current after the processing of pressure under the driving of drive module
AC energy can be converted to；
The current detection circuit, for detecting the current value of the AC energy, and using the current value of detection as anti-
Supply current；
The controller, for generating drive signal according to the feedback current, and the drive signal is sent to institute
State drive module.
Preferably, the equalizer circuit includes：The electric capacity of two series connection, it is passive that each electric capacity is parallel with resistance identical respectively
Device.
Preferably, the three-phase tri-level inverter has two, and is connected in parallel on DC side respectively；
Preferably, the inverter circuit also includes：Filter outputting inductance；
The filtering outputting inductance, for being filtered to the AC energy, and filtered AC energy is exported.
Preferably, the filtering outputting inductance includes：Two groups from inductor and one group of total inductance device, it is described from inductor point
Dui Yingyu not the three-phase tri-level inverter；
Each group connects from the first end of inductor and the output end of corresponding three-phase tri-level inverter, and each group is from inductor
The second end be connected with the first end of the total inductance device.
Preferably, first end of the second end and each group of the current detection circuit and the total inductance device from inductor
Connect respectively.
Preferably, each three-phase tri-level inverter includes multiple bridge arms respectively, and it is double that each bridge arm includes four insulated gates respectively
Bipolar transistor IGBT.
Preferably, the corresponding bridge arm between the three-phase tri-level inverter is connected in parallel, the drive between corresponding bridge arm
The carrier phase of dynamic signal is opposite and modulating wave is identical.
The utility model is respectively turned direct current energy under the driving of drive module by multiple three-phase tri-level inverters
It is changed to AC energy, the feedback current that controller detects according to current detection circuit generates drive signal, and by the driving
Signal is sent to the drive module, limited in one's ability so as to avoid single grid-connected inverters output current, is switched without increasing
Frequency, the loss to device is reduced, avoid and the stability and security of grid-connection control system are threatened, in addition, nothing
It inductance value need to be increased still can reach and filter out ripple harmonic, the volume and cost of inverter circuit will not be increased.
Brief description of the drawings
Fig. 1 is the first reality of the parallel three-level inverter circuit of the present utility model using carrier pulse modulation technique
Apply the structured flowchart of example；
Fig. 2 is the total topology block diagram of the parallel three-level inverter of the utility model embodiment；
Fig. 3 is four triangular carrier generation figures of the utility model embodiment；
Fig. 4 is that phase-shifting carrier wave modulation is shown between carrier wave stacking modulation and parallel arm on the same bridge arm of the utility model embodiment
It is intended to；
Fig. 5 is the closed-loop current control figure of the utility model embodiment.
Realization, functional characteristics and the advantage of the utility model purpose will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
It should be appreciated that specific embodiment described herein is not used to limit this only to explain the utility model
Utility model.
Reference picture 1, the utility model first embodiment provide a kind of parallel three electricity using carrier pulse modulation technique
Flat inverter circuit, the inverter circuit include：Equalizer circuit, multiple three-phase tri-level inverters, current detection circuit, controller
And drive module；
The equalizer circuit, handled for carrying out pressure to the direct current energy of input, obtain DC side central point position, it is described
The N lines of DC side central point position and AC connect；
Each three-phase tri-level inverter parallel, it is respectively used to the direct current after the processing of pressure under the driving of drive module
AC energy can be converted to；
The current detection circuit, for detecting the current value of the AC energy, and using the current value of detection as anti-
Supply current；
The controller, for generating drive signal according to the feedback current, and the drive signal is sent to institute
State drive module.
The present embodiment is respectively changed direct current energy under the driving of drive module by multiple three-phase tri-level inverters
For AC energy, feedback current that controller detects according to current detection circuit generates drive signal, and by the drive signal
Send to the drive module, it is limited in one's ability so as to avoid single grid-connected inverters output current, without increasing switching frequency,
The loss to device is reduced, avoids and the stability and security of grid-connection control system is threatened, in addition, without increase
Inductance value, which still can reach, filters out ripple harmonic, will not increase the volume and cost of inverter circuit.
For ease of ensureing voltage equalizing, reference picture 2, the equalizer circuit includes：The electric capacity of two series connection, each electric capacity difference
It is parallel with resistance identical passive device.
For ease of being changed to the direct current energy, in the present embodiment, the three-phase tri-level inverter has two,
And DC side is connected in parallel on respectively；
For ease of being filtered to the alternating current, in the present embodiment, the inverter circuit also includes：Filtering output electricity
Sense；
The filtering outputting inductance, for being filtered to the AC energy, and filtered AC energy is exported.
For ease of being filtered respectively to the AC power of two three-phase tri-level inverter conversions, and to the friendship after converging
Stream power supply is filtered again, and in the present embodiment, the filtering outputting inductance includes：Two groups from inductor and one group of total inductance
Device, it is described to correspond respectively to the three-phase tri-level inverter from inductor；
Each group connects from the first end of inductor and the output end of corresponding three-phase tri-level inverter, and each group is from inductor
The second end be connected with the first end of the total inductance device.
For ease of being detected from the electric current of inductor input, and the electric current of total inductance device output end is detected,
The current detection circuit is connected respectively with the second end of the total inductance device and each group from the first end of inductor.
In the specific implementation, each three-phase tri-level inverter includes multiple bridge arms respectively, each bridge arm includes four absolutely respectively
Edge grid bipolar transistor IGBT, four IGBT are connected in series, and are connected in parallel between multiple bridge arms.
Correspondingly, the corresponding bridge arm between the three-phase tri-level inverter is connected in parallel, the drive between corresponding bridge arm
The carrier phase of dynamic signal opposite (i.e. phase differs 180 °) and modulating wave is identical, due to phase-shifting carrier wave between use bridge arm in parallel,
The current ripples amplitude of each bridge arm connection inductor output in parallel is equal, and phase is caused by carrier phase difference on the contrary, therefore in parallel
What bridge arm output collected cancels out each other to current ripples on total inductance device.
Switching frequency is equivalent to twice of single inverter, the switching frequency of current ripples and IGBT on total inductance device and
Inductive drop △ uL are relevant, ripple frequency proximity switch frequency, then total output current ripple switching frequency compares single three level
Inverter switching frequency is much higher, and the cut-off frequency of filter inductance is far below the shunt chopper using phase-shifting carrier wave by contrast
Switching frequency, therefore inductance ripple current attenuation is big, and the ripple current for being output to power network is many less.
In addition, can four IGBT on bridge arm be used with carrier wave lamination techniques, modulated between bridge arm in parallel using phase-shifting carrier wave
Output current switch frequency is improved, closed-loop current control, each shunt chopper are used after being sampled for whole inverter current
Closed-loop current control is carried out, the identical bridge arm output end of shunt chopper connects respectively synthesizes a phase as output after inductor
It is connected with net side bus by total inductance device, this parallel three-level inverter is subject to closed-loop current control, reduces parallel connection
Inverter circulation caused by parallel connection, and inverter equivalent switching frequency is significantly improved, suppress harmonic wave, furthermore the inversion after parallel connection
Device output current significantly improves, and ripple reduces.
Reference picture 2, the single bridge arm outlet side inductor of two inverters in parallel be connected again by total inductance device with exchange
Net side is connected, and it is respectively the three-phase alternating current output point of inverter 1, the three-phase alternating current output point of inverter 2 to share three current sampling points
And alternating current net side feeder line.Three portion of electrical current pass through current detection circuit 1, current detection circuit 2 and current detection circuit 3 respectively
Sampling, and transmit to controller, the controller uses programmable hardware logical device (FPGA), and FPGA mainly completes three-phase tune
Ripple generation processed, four triangular waves generation that three-level inverter phase-shifting carrier wave in parallel uses, and two each bridges of inverter of control
The IGBT of arm pwm signal generation.
It is illustrated in figure 3 four triangular carrier generation figures of A phases.Triangular carrier 1 is same phase with 2, is translated in Y-axis, triangle
The phase shift T/N of carrier wave 1 obtains triangular carrier 3, and using two unit parallel connection N=2, it is 180 ° to obtain the phase shifting angle of triangular carrier 3, triangle
180 ° of 2 phase shift of carrier wave obtains triangular carrier 4.
As shown in figure 4, contain four switching device IGBT in the single bridge arm of three-level inverter, according to three-level control principle
Strategy, turn-on and turn-off mode turn on for 1 and 2 pipes, the shut-off of 3 and 4 pipes, or the conducting of 2 and 3 pipes, the shut-off of 1 and 4 pipes, or 1 and 2 pipes close
Disconnected, 3 and 4 pipes are open-minded.Modulated in the present embodiment for four being laminated using carrier wave for IGBT on A phase bridge arms, it is necessary to two triangles
Carrier wave.Pipe 1 and pipe 3 are a pair of complementary PWM ripples, and pipe 2 and pipe 4 are a pair of complementary PWM ripples, and the modulated signal of the bridge arm is identical.Three
Angle carrier wave 1 is identical with 2 frequencies, phase, and amplitude translates in Y-axis.Triangular carrier 1 and modulating wave compare generation complementary PWM signals
Driving tube 1 and pipe 3 respectively, triangular carrier 2 and modulating wave compare generation complementary PWM signals difference driving tube 2 and pipe 4.It is in parallel inverse
Become device A phase bridge arms to be equally laminated using carrier wave, using two-way with mutually stacking triangular wave, but triangular carrier 3 is on the basis of triangular carrier 1
Upper 180 ° of phase shift, 180 ° of phase shift on the basis of triangular carrier 2 of triangular carrier 4, triangular carrier 3 and modulating wave compare generation two
Road PWM controls the pipe 1 and pipe 3 of bridge arm in parallel, and triangular carrier 4 and modulating wave compare the pipe 2 that generation two-way PWM controls bridge arm in parallel
With pipe 4, between bridge arm in parallel be phase-shifting carrier wave modulate.B phases and the C bridge arm that is in parallel are adjusted using B phases modulating wave with C phases respectively
Ripple processed relatively obtains 8 IGBT of pwm signal driving B phases and C phases with triangular carrier.
The ripple of inverter output current is relevant with pressure drop △ U on switching frequency f and inductance,
△ U=U1-USsin (wt+ Φ), △ U=L*di/t, USsin (wt+ Φ) are voltage on line side, and U1 is inverter electricity
Voltage before sensor, embodiment use tri-level inversion technology, make AN current potentials for U/2,0 ,-U/2, than two level output U ,-U
The small U/2 of voltage, then three level U1=U/2, two level U1=U.Then di/t phases of the three level △ U=L*di/t under same inductance
To smaller, electric current output ripple is smaller than two level, and phase-shifting carrier wave, the output current ripple of inverter 1 and inverter 2 are used after in parallel
Output ripple amplitude is equal, opposite in phase, and the current ripples that output point is convergeed on total inductance device are cancelled out each other, and reduces inverter
Output current ripple.
As shown in figure 5, feedback current IfObtained by current sample module samples, voltage on line side is changed to obtain as abc-dq
With the phase angle of voltage on line side same-phase, real-time tracking locking net side phase, inverter output current instruction amplitude is given, with net
Side phase angle is multiplied to obtain instruction current signal by multiplier, with feedback current IfMake the difference, adjust Proportional coefficient K P, adjusted
Ripple processed.
It should be noted that herein, term " comprising ", "comprising" or its any other variant are intended to non-row
His property includes, so that process, method, article or system including a series of elements not only include those key elements, and
And also include the other element being not expressly set out, or also include for this process, method, article or system institute inherently
Key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that including this
Other identical element also be present in the process of key element, method, article or system.
Above-mentioned the utility model embodiment sequence number is for illustration only, does not represent the quality of embodiment.
Preferred embodiment of the present utility model is these are only, not thereby limits the scope of the claims of the present utility model, it is every
The equivalent structure or equivalent flow conversion made using the utility model specification and accompanying drawing content, or be directly or indirectly used in
Other related technical areas, similarly it is included in scope of patent protection of the present utility model.
Claims (8)
- A kind of 1. parallel three-level inverter circuit using carrier pulse modulation technique, it is characterised in that the inverter circuit Including：Equalizer circuit, multiple three-phase tri-level inverter, current detection circuit, controller and drive modules；The equalizer circuit, handled for carrying out pressure to the direct current energy of input, obtain DC side central point position, the direct current The N lines of side central point position and AC connect；Each three-phase tri-level inverter parallel, it is respectively used to turn the direct current energy after the processing of pressure under the driving of drive module It is changed to AC energy；The current detection circuit, for detecting the current value of the AC energy, and using the current value of detection as feedback electricity Stream；The controller, for generating drive signal according to the feedback current, and the drive signal is sent to the drive Dynamic model block.
- 2. inverter circuit as claimed in claim 1, it is characterised in that the equalizer circuit includes：The electric capacity of two series connection, respectively Electric capacity is parallel with resistance identical passive device respectively.
- 3. inverter circuit as claimed in claim 2, it is characterised in that the three-phase tri-level inverter has two, and divides DC side is not connected in parallel on it.
- 4. inverter circuit as claimed in claim 3, it is characterised in that the inverter circuit also includes：Filter outputting inductance；The filtering outputting inductance, for being filtered to the AC energy, and filtered AC energy is exported.
- 5. inverter circuit as claimed in claim 4, it is characterised in that the filtering outputting inductance includes：Two groups from inductor It is described to correspond respectively to the three-phase tri-level inverter from inductor with one group of total inductance device；Each group connects from the first end of inductor and the output end of corresponding three-phase tri-level inverter, each group from inductor the Two ends are connected with the first end of the total inductance device.
- 6. inverter circuit as claimed in claim 5, it is characterised in that the of the current detection circuit and the total inductance device Two ends and each group connect respectively from the first end of inductor.
- 7. inverter circuit as claimed in claim 3, it is characterised in that each three-phase tri-level inverter includes multiple bridges respectively Arm, each bridge arm include four insulated gate bipolar transistor IGBTs respectively.
- 8. inverter circuit as claimed in claim 7, it is characterised in that the corresponding bridge arm between the three-phase tri-level inverter It is connected in parallel, the carrier phase of the drive signal between corresponding bridge arm is opposite and modulating wave is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720455003.3U CN206790369U (en) | 2017-04-26 | 2017-04-26 | Using the parallel three-level inverter circuit of carrier pulse modulation technique |
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| CN201720455003.3U CN206790369U (en) | 2017-04-26 | 2017-04-26 | Using the parallel three-level inverter circuit of carrier pulse modulation technique |
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