CN109980950A - Double PWM variable-frequency power sources feedback energy processing units and method - Google Patents
Double PWM variable-frequency power sources feedback energy processing units and method Download PDFInfo
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- CN109980950A CN109980950A CN201910293405.1A CN201910293405A CN109980950A CN 109980950 A CN109980950 A CN 109980950A CN 201910293405 A CN201910293405 A CN 201910293405A CN 109980950 A CN109980950 A CN 109980950A
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- 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
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of double PWM variable-frequency power sources feedback energy processing units and methods, and wherein device includes signal acquisition circuit and brake unit, and signal acquisition circuit is electrically connected with the tie point of two concatenation dc-link capacitances；Brake unit includes braking resistor, and the dc-link capacitance that brake unit is concatenated with two simultaneously connects；Brake unit and/or signal acquisition circuit are electrically connected with the controller respectively.When operation, signal acquisition circuit acquires DC bus-bar voltage in real time, and the DC bus-bar voltage is transferred to controller, DC bus-bar voltage is compared with presetting threshold value Ua and/or threshold value Ub by controller, and PWM rectifier is controlled according to comparison result and switches or stops working between rectification and active inversion state, or/and control braking resistor is flowed through with and without stalling current, to realize energy in the two-way flow of grid side and load-side, feedback energy is avoided to cause failure, it is safe and reliable to operation, it is at low cost.
Description
Technical field
The present invention relates to variable-frequency power sources technical field more particularly to a kind of double PWM variable-frequency power sources feedback energy processing units
And method.
Background technique
As shown in Figure 1, the voltage-type ac-dc-ac inverter power supply that magnetic stirrer uses, generally include PWM rectifier 4,
Intermediate link 3 and PWM inverter 2.Wherein PWM rectifier 4 include by power device IGBT (VT11 and VT14, VT13 and VT16,
VT15 and VT12) constitute rectifier bridge；Wherein PWM inverter 2 include by can switch-off power device IGBT (VT21 and VT24,
VT23 and VT26, VT25 and VT22) constitute inverter bridge；Wherein intermediate link 3 include two concatenation dc-link capacitance (C1 and
C2) and equalizing resistance (R1 and R2), DC bus storage capacitor are used for stable DC voltage, and equalizing resistance is for realizing series electrical
The voltage of electrolysis condenser is impartial.When variable-frequency power sources starting, power grid energy first flow to PWM rectifier 4 by reactor, and
It is stored energy on dc-link capacitance by PWM rectifier 4, rear class PWM inverter 2 is again by dc-link capacitance storage
Energy is transferred to load with inverting.
For inertia load, in shutdown or the system failure, the feedback energy that system generates is pooled to dc-link capacitance
On, if feedback energy cannot be handled in time, it is bound to cause DC bus-bar voltage pump and rises, DC bus overvoltage protection can be caused dynamic
Make, cause the excessive pressure damages of main circuit power device and dc-link capacitance, and then influence system worked well, leads to system event
Barrier.
For the stable operation for ensuring system, guarantee the normal work of system, for the common place of feedback energy of inverter side
There are two types of reason mode is basic: (1) energy is sent out by brake unit and braking resistor in the parallel connection of dc-link capacitance side with resistance
The form of heat consumes., response speed simple using such martingale is very fast, is easily achieved, and the R&D cycle is short；But it also results in
Energy dissipation increases that hardware cost, feedback energy are unpredictable to be difficult to match braking resistor, resistance heating influence system well
Heat dissipation effect.(2) energy realizes energy from side is loaded to grid side by the plug-in inversion unit being made of thyristor or IGBT
Feedback.Solves the problems such as dynamic braking energy dissipation, dynamic braking low efficiency using such mode；But increase hardware at
This easily forms electric current winding, and energy cannot be well in net side and load-side two-way flow.
Summary of the invention
In view of the above deficiencies, the technical problems to be solved by the present invention are: providing a kind of double PWM variable-frequency power sources feedback energies
Processing unit and method, the system failure occurs caused by avoiding variable-frequency power sources because of feedback energy, safe and reliable to operation, and
It is at low cost.
In order to solve the above technical problems, the technical scheme is that
A kind of double PWM variable-frequency power sources feedback energy processing units, the variable-frequency power sources includes PWM rectifier, intermediate link
And controller, the intermediate link include the dc-link capacitance of two concatenations, the processing unit includes: signal acquisition electricity
Road, the signal acquisition circuit acquire DC bus-bar voltage by being electrically connected with the tie point of two concatenation dc-link capacitances；
Brake unit, the brake unit include by the braking resistor of fever consumption feedback energy, and the brake unit is concatenated with two
Dc-link capacitance simultaneously connects；And the brake unit and/or the signal acquisition circuit are electrically connected with the controller respectively；Institute
Signal acquisition circuit transmission DC bus-bar voltage is stated to the controller；The controller is by DC bus-bar voltage and presetting
Threshold value Ua and/or threshold value Ub are compared, according to comparison result control the PWM rectifier rectification and active inversion state it
Between switch or stop working, or/and the control braking resistor is flowed through with and without stalling current.
Preferred embodiment is that the output end of the brake unit is electrically connected by switching device with the braking resistor, described
Brake unit passes through the on and off for controlling the switching device, to control the braking resistor with and without stalling current stream
It crosses.
Preferred embodiment is that the input terminal of the brake unit is electrically connected with the controller, described in the controller control
Brake unit removes switching device described on and off；Or, the input terminal of the brake unit accesses DC bus-bar voltage, it is described
Brake unit comes switching device described on and off, and the base by comparing built-in reference voltage and DC bus-bar voltage
Quasi- voltage swing is threshold value Ub.
Preferred embodiment is that the controller controls the PWM rectifier by exporting SVPWM wave to the PWM rectifier
Active inversion state is switched to by rectification state.
Preferred embodiment is that the voltage difference between the controller transmission DC bus-bar voltage and threshold value Ua gives PI controller,
Control signal is exported to the controller according to voltage difference by PI controller, the controller transmits SVPWM according to control signal
Wave gives the PWM rectifier.
Preferred embodiment is that the signal acquisition circuit acquires power grid electricity by the first Hall sensor being located on power grid
Pressure, and it is transferred to the controller；The controller controls the PWM rectifier for feedback energy inversion according to network voltage
At with the consistent electric energy of grid voltage amplitude, frequency and phase.
Preferred embodiment is that the signal acquisition circuit acquires load electricity by being located at the second Hall sensor of load-side
Source, and it is transferred to the controller.
Double PWM variable-frequency power sources feedback energy processing methods are applied to double PWM variable-frequency power sources, and the variable-frequency power sources includes PWM
Rectifier and intermediate link, the intermediate link both ends are simultaneously connected to braking resistor for consuming feedback energy,
The processing method, comprising the following steps:
Obtain DC bus-bar voltage；
Judge whether DC bus-bar voltage matches with given threshold Ua and threshold value Ub；
If it is, generating corresponding control signal；
The PWM rectifier, which is controlled, according to the control signal switches or stop work between rectification and active inversion state
Make, or/and, it controls the braking resistor and is flowed through with and without stalling current.
Preferred embodiment is, described to judge whether DC bus-bar voltage matches with given threshold Ua and threshold value Ub, comprising:
The DC bus-bar voltage is more than or equal to threshold value Ua, and is less than threshold value Ub, then, controls institute according to the control signal
It states PWM rectifier and is switched to active inversion state, and the control braking resistor does not have stalling current to flow through；
The DC bus-bar voltage is more than or equal to threshold value Ub, then, controls the PWM rectifier according to the control signal and stop
It only works, and the control braking resistor has stalling current to flow through.
Preferred embodiment is, further comprising the steps of:
Obtain network voltage；
When the control PWM rectifier is switched to active inversion state, according to the network voltage, the PWM is controlled
Feedback energy is reverse into and grid voltage amplitude, frequency and the consistent electric energy of phase by rectifier.
After adopting the above technical scheme, the beneficial effects of the present invention are:
Due to double PWM variable-frequency power sources feedback energy processing units of the invention and method, wherein processing unit includes signal
Acquisition Circuit and brake unit, wherein signal acquisition circuit is adopted by being electrically connected with the tie point of two concatenation dc-link capacitances
Collect DC bus-bar voltage；Wherein brake unit includes by the braking resistor of fever consumption feedback energy, brake unit and two strings
It connects dc-link capacitance and connects；And brake unit and/or signal acquisition circuit are electrically connected with the controller respectively.When operation, signal
Acquisition Circuit acquires DC bus-bar voltage in real time, and the DC bus-bar voltage is transferred to controller, by controller that direct current is female
Line voltage is compared with presetting threshold value Ua and/or threshold value Ub, and according to comparison result control PWM rectifier rectification and
Switch or stop working between active inversion state, or/and control braking resistor is flowed through with and without stalling current, to realize
Two-way flow of the energy in grid side and load-side, effective protection dc-link capacitance avoid occurring to draw because of feedback energy
The failure risen, makes safe and reliable to operation and at low cost.
Since signal acquisition circuit acquires network voltage by the first Hall sensor being located on power grid, and it is transferred to
Controller；Controller according to network voltage, control PWM rectifier by feedback energy be reverse into grid voltage amplitude, frequency with
And the consistent electric energy of phase；Power grid is set not generate harmonic pollution.
Detailed description of the invention
Fig. 1 is the schematic diagram of double PWM variable-frequency power sources；
Fig. 2 is the circuit diagram of brake unit；
Fig. 3 is feedback energy classification processing figure；
Fig. 4 is the block diagram of double PWM variable-frequency power sources feedback energy processing methods of the invention；
In figure: 1- tie point, 2-PWM inverter, 3- intermediate link, 4-PWM rectifier.
Specific embodiment
Understand to remove the objectives, technical solutions, and advantages of the present invention more, it is with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Embodiment one:
As shown in Figure 1, Figure 2 and Figure 3, a kind of double PWM variable-frequency power sources feedback energy processing units, variable-frequency power sources includes PWM
Rectifier 4, intermediate link 3, PWM inverter 2 and controller, controller is dsp controller in this example, preferably
TMS320F28335；Controller passes through driving isolation, protection circuit and PWM rectifier 4 respectively, and PWM inverter 2 is electrically connected, and drives
Dynamic circuit includes the IGBT drive circuit being made of IR2110 chip, and driving circuit input terminal connects controller, output end connection
PWM rectifier 4 and PWM inverter 2；Intermediate link 3 includes the dc-link capacitance C1 and C2 of two concatenations, with C1 and the pressure that connects
Resistance R1, and with C2 and the equalizing resistance R2 that connects.
Processing unit of the invention includes signal acquisition circuit and brake unit, and signal acquisition circuit is ADC letter in this example
Number Acquisition Circuit, that is, the DC bus-bar voltage acquired are transferred to controller after analog-to-digital conversion；Signal acquisition circuit by with
The tie point 1 of two concatenation dc-link capacitance C1 and C2 is electrically connected, to acquire DC bus-bar voltage；Wherein brake unit includes logical
The braking resistor R of fever consumption feedback energy is crossed, brake unit concatenates dc-link capacitance with two and connects；And brake unit and/
Or signal acquisition circuit is electrically connected with the controller respectively；Signal acquisition circuit transmits DC bus-bar voltage to controller；Controller
DC bus-bar voltage is compared with presetting threshold value Ua and/or threshold value Ub, PWM rectifier 4 is controlled according to comparison result
Switch or stop working between rectification and active inversion state, or/and control braking resistor R is with and without stalling current stream
It crosses.In the present embodiment: signal acquisition circuit acquires network voltage by the first Hall sensor being located on power grid, and transmits
To controller, controller obtains real-time grid voltage；On power grid three-phase U, V and W, the first Hall sensor of setting is respectively
S11, S12 and S13, the first Hall sensor being arranged in each phase are electrically connected with signal acquisition circuit respectively.
As shown in Figure 1, Figure 2 and Figure 3, in shutdown or the system failure, load stored electromagnetic energy release, energy by
The power device IGBT (VT21 and VT24, VT23 and VT26, VT25 and VT22) of PWM inverter 2 integrated freewheeling diode to
Dc-link capacitance (C1 and C2) charging causes DC bus-bar voltage pump to rise.ADC signal sample circuit acquires DC bus at this time
The actual value of voltage Udc, and actual value is transferred to controller after analog-to-digital conversion, controller is by DC bus-bar voltage Udc
Actual value make comparisons with presetting threshold value Ua and threshold value Ub.
As shown in figure 3, belonging to normal dynamic change, no feedback at this time when DC bus-bar voltage Udc is less than threshold value Ua
Energy or feedback energy are smaller, and DC bus-bar voltage pump liter is lower, are adjusted by dc-link capacitance charging.When straight
Busbar voltage Udc is flowed more than or equal to threshold value Ua and when being less than threshold value Ub, there is biggish feedback energy at this time, and controller judgement is answered
Using " energy feedback " processing mode, specifically: control PWM rectifier 4 switches to active inversion state, and keeps braking resistor
R does not have stalling current to flow through；Meanwhile the network voltage that controller is acquired according to each the first Hall sensor of phase, control PWM rectification
When feedback energy is reverse into electric energy by device 4, make its amplitude, frequency and phase and each phase amplitude of current power grid, frequency and
Phase is consistent, when flowing to power grid so as to feedback energy, is nearly free from harmonic pollution to power grid.Present invention utilizes original
The hardware configuration of PWM rectifier 4, realizes level-one energy feedback, reduces costs, and DC bus-bar voltage is also forced to fall after rise to just
Normal range avoids DC bus-bar voltage from persistently pumping liter and causes failure, damages dc-link capacitance.
When DC bus-bar voltage Udc is more than or equal to threshold value Ub, show that there are a large amount of feedback energies, and feedback energy
Power is greater than 4 active inversion power of PWM rectifier, and DC bus-bar voltage is caused persistently to pump liter, dc-link capacitance charging and energy
Amount feedback mode cannot be such that system operates normally, and controller judgement at this time should use " dynamic braking " processing mode, specifically: control
Device control PWM rectifier 4 processed stops working, and pulse blocking makes braking resistor R have stalling current to flow through, and discharges braking resistor R
Heat, dissipation feedback energy force DC bus-bar voltage to fall after rise rapidly, directly while avoiding bus DC voltage from persistently pumping liter
It is less than threshold value Ua to DC bus-bar voltage Udc, at this point, flowing through braking resistor R without stalling current, braking resistor R is dissipating naturally
Heat reduces own temperature, and system is made to restore normal operating conditions.
To sum up, double PWM variable-frequency power sources feedback energy processing units of the invention, are utilized original hardware configuration, realize
Two-way flow of the energy in grid side and load-side, effective protection dc-link capacitance avoid occurring to draw because of feedback energy
The failure risen, makes safe and reliable to operation and at low cost.
As shown in Fig. 2, the output end of brake unit is electrically connected by switching device with braking resistor R, brake unit passes through
The on and off of control switch device flows through to control braking resistor R with and without stalling current.The input terminal of brake unit
The DC bus-bar voltage that signal acquisition circuit acquires is compared by controller electrical connection, controller with threshold value Ub, as direct current mother
Line voltage is more than or equal to threshold value Ub, and controller inputs corresponding electric signal to brake unit, makes brake unit output end output signal,
Make switch device conductive, braking resistor R has stalling current to flow through, and otherwise, no stalling current flows through；Alternatively, brake unit
Input terminal is directly electrically connected with the tie point 1 of two series direct current bus capacitors, and brake unit is built-in with reference voltage at this time, the base
Quasi- voltage swing is threshold value Ub；It compares the DC bus-bar voltage acquired in real time with reference voltage, once, work as DC bus
Voltage is more than or equal to threshold value Ub, and brake unit output end output signal makes switch device conductive, and braking resistor R has stalling current
It flows through, otherwise, no stalling current flows through.
Brake unit in this example includes reference circuit and comparison circuit, reference voltage built in reference circuit, by more electric
Built-in voltage is compared by road with DC bus-bar voltage, and when DC bus-bar voltage is more than or equal to threshold value Ub, comparison circuit is defeated
Continuity signal out, makes switch device conductive, and stalling current is made to flow through braking resistor R, carries out dissipation feedback energy；When less than threshold
When value Ub, switching device cut-off, braking resistor R does not have stalling current to flow through.The above-mentioned preferred power device IGBT of switching device, figure
In be VT1.Because brake unit used in this example is the prior art, brake unit control in the output end and Fig. 2 of brake unit
Device is corresponding, is not described in detail its particular circuit configurations herein.
In addition, controller controls PWM rectifier by rectification shape by exporting SVPWM wave to PWM rectifier in the present embodiment
State switches to active inversion state.Voltage difference between controller transmission DC bus-bar voltage Udc and threshold value Ua gives PI controller,
Control signal is exported to controller according to voltage difference by PI controller, controller is whole to PWM according to control signal transmission SVPWM wave
Flow device.
As shown in Figure 1, signal acquisition circuit acquires load power source by being located at the second Hall sensor of load-side, and pass
It is defeated by controller；Specifically: threephase load is respectively to concatenate loading coil L1 and resistance R24, loading coil L2 and resistance R25,
Loading coil L3 and resistance R26, the second Hall sensor being correspondingly arranged are respectively S21, S22 and S23, and each the second Hall of phase passes
Load side voltage is transferred to controller by sensor respectively, enables the controller to real-time detection load-side, relatively reliable operation.
Embodiment two:
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, double PWM variable-frequency power sources feedback energy processing methods are applied to double PWM frequency conversions
Power supply, variable-frequency power sources include PWM rectifier 4 and intermediate link 3, and 3 both ends of intermediate link are simultaneously connected to for consuming feedback energy
Braking resistor R,
Processing method, comprising the following steps:
Step S1, DC bus-bar voltage is obtained, by ADC signal Acquisition Circuit in this example, to acquire two concatenation DC bus
1 voltage of tie point of capacitor is realized, can be acquired using other modes；
Step S2, judge whether DC bus-bar voltage matches with given threshold Ua and/or threshold value Ub；
Step S3, if it is, generating corresponding control signal；
Step S4, switch or stop work between rectification and active inversion state according to control signal control PWM rectifier 4
Make, or/and, control braking resistor R is flowed through with and without stalling current；Braking resistor R is controlled by power device VT1 in this example,
The control terminal of power device VT1 and the output end of brake unit connect；When VT1 conducting, braking resistor R has stalling current stream
It crosses, otherwise disconnects；Certainly, braking resistor R is flowed through with and without stalling current, and the control of other switching circuits, unlimited institute can be used
The power device VT1 enumerated.
Step S2 is specifically included:
DC bus-bar voltage is less than threshold value Ua, does not act, keeps reliability service by dc-link capacitance charging；
DC bus-bar voltage is more than or equal to threshold value Ua, and is less than threshold value Ub, then, controls PWM rectifier 4 according to control signal
It is switched to active inversion state, and control braking resistor R has stalling current to flow through；
DC bus-bar voltage is more than or equal to threshold value Ub, then, is stopped working according to control signal control PWM rectifier 4, and,
Control braking resistor R does not have stalling current to flow through.
It is further comprising the steps of in the present embodiment:
Obtain network voltage, acquire network voltage in this example using the first Hall sensor, the first Hall sensor and
Signal acquisition circuit electrical connection, the unlimited Hall sensor of the acquisition of certain network voltage can also use other sample circuits.
When control PWM rectifier 4 is switched to active inversion state, according to network voltage, controlling PWM rectifier 4 will be returned
Energy regenerative amount is reverse into the electric energy consistent with grid voltage amplitude, frequency and phase；When specific are as follows: controller is adopted by signal
Sample circuit acquires the actual value of DC bus-bar voltage Udc, controller is transferred to after analog-to-digital conversion, controller is according to formula Δ
Udc=Udc-Ua calculates DC bus-bar voltage increment, and Δ Udc is sent into PI controller, defeated by PI controller according to Δ Udc
Corresponding control signal out, controller transmit SVPWM wave through driving according to each phase voltage of real-time signal analysis power grid of acquisition
Dynamic isolation, protection circuit transmission make PWM rectifier 4 be switched to active inversion state by rectification state to PWM rectifier 4, make through
Cross inversion flow to power grid feedback energy it is consistent with power grid, make power grid almost without harmonic wave generation.
Using method of the invention, the framework matched by " level-one " energy feedback with " second level " dissipation braking is both real
Two-way flow of the existing energy in net side and load-side, and effective protection dc-link capacitance, simultaneously because utilizing PWM rectifier electricity
Line structure is not further added by system hardware cost, further improves the power factor of rectifier net side, does not almost generate harmonic wave to power grid
Pollution；Double PWM variable-frequency power sources are avoided because of the system failure caused by feedback energy, ensure that the safe and reliable operation of system.
The preferred embodiment of present invention described above, is not intended to limit the invention, it is all in spirit of the invention and
Made any modification within principle, etc. same double PWM variable-frequency power sources feedback energy processing units and method structure improvement
Deng should all be included in the protection scope of the present invention.
Claims (10)
1. pair PWM variable-frequency power sources feedback energy processing unit, the variable-frequency power sources includes PWM rectifier, intermediate link and control
Device processed, the intermediate link include the dc-link capacitance of two concatenations, which is characterized in that the processing unit includes:
Signal acquisition circuit, the signal acquisition circuit are acquired by being electrically connected with the tie point of two concatenation dc-link capacitances
DC bus-bar voltage；
Brake unit, the brake unit include by the braking resistor of fever consumption feedback energy, the brake unit and two
Concatenation dc-link capacitance simultaneously connects；
And the brake unit and/or the signal acquisition circuit are electrically connected with the controller respectively；
The signal acquisition circuit transmission DC bus-bar voltage gives the controller；The controller is by DC bus-bar voltage and in advance
The threshold value Ua and/or threshold value Ub of setting are compared, and control the PWM rectifier in rectification and active inversion according to comparison result
Switch between state or stop working, or/and the control braking resistor is flowed through with and without stalling current.
2. double PWM variable-frequency power sources feedback energy processing units according to claim 1, which is characterized in that the braking is single
The output end of member is electrically connected by switching device with the braking resistor, and the brake unit is by controlling the switching device
On and off flows through to control the braking resistor with and without stalling current.
3. double PWM variable-frequency power sources feedback energy processing units according to claim 2, which is characterized in that
The input terminal of the brake unit is electrically connected with the controller, the controller control the brake unit go conducting and
End the switching device；Or,
The input terminal of the brake unit accesses DC bus-bar voltage, and the brake unit is by comparing built-in reference voltage and directly
Busbar voltage is flowed, carrys out switching device described on and off, and the reference voltage size is threshold value Ub.
4. double PWM variable-frequency power sources feedback energy processing units according to claim 1, which is characterized in that
The controller controls the PWM rectifier and is switched by rectification state by exporting SVPWM wave to the PWM rectifier
To active inversion state.
5. double PWM variable-frequency power sources feedback energy processing units according to claim 4, which is characterized in that
Voltage difference between the controller transmission DC bus-bar voltage and threshold value Ua gives PI controller, by PI controller according to electricity
Pressure difference exports control signal to the controller, and the controller is rectified according to control signal transmission SVPWM wave to the PWM
Device.
6. double PWM variable-frequency power sources feedback energy processing units according to claim 1 or 4, which is characterized in that
The signal acquisition circuit acquires network voltage by the first Hall sensor being located on power grid, and is transferred to described
Controller；
The controller controls the PWM rectifier and is reverse into feedback energy and grid voltage amplitude, frequency according to network voltage
Rate and the consistent electric energy of phase.
7. double PWM variable-frequency power sources feedback energy processing units according to claim 1, which is characterized in that
The signal acquisition circuit acquires load power source by being located at the second Hall sensor of load-side, and is transferred to the control
Device processed.
8. pair PWM variable-frequency power sources feedback energy processing method is applied to double PWM variable-frequency power sources, the variable-frequency power sources includes PWM whole
Flow device and intermediate link, which is characterized in that the intermediate link both ends are simultaneously connected to braking resistor for consuming feedback energy,
The processing method, comprising the following steps:
Obtain DC bus-bar voltage；
Judge whether DC bus-bar voltage matches with given threshold Ua and threshold value Ub；
If it is, generating corresponding control signal；
The PWM rectifier is controlled according to the control signal to switch or stop working between rectification and active inversion state,
Or/and it controls the braking resistor and is flowed through with and without stalling current.
9. double PWM variable-frequency power sources feedback energy processing methods according to claim 8, which is characterized in that the judgement is straight
Whether stream busbar voltage matches with given threshold Ua and threshold value Ub, comprising:
The DC bus-bar voltage is more than or equal to threshold value Ua, and is less than threshold value Ub, then, according to control signal control
PWM rectifier is switched to active inversion state, and the control braking resistor does not have stalling current to flow through；
The DC bus-bar voltage is more than or equal to threshold value Ub, then, controls the PWM rectifier according to the control signal and stop work
Make, and the control braking resistor has stalling current to flow through.
10. double PWM variable-frequency power sources feedback energy processing methods according to claim 9, which is characterized in that further include following
Step:
Obtain network voltage；
When the control PWM rectifier is switched to active inversion state, according to the network voltage, the PWM rectification is controlled
Feedback energy is reverse into and grid voltage amplitude, frequency and the consistent electric energy of phase by device.
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| CN201910293405.1A CN109980950A (en) | 2019-04-12 | 2019-04-12 | Double PWM variable-frequency power sources feedback energy processing units and method |
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| CN201910293405.1A CN109980950A (en) | 2019-04-12 | 2019-04-12 | Double PWM variable-frequency power sources feedback energy processing units and method |
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| CN201910293405.1A Pending CN109980950A (en) | 2019-04-12 | 2019-04-12 | Double PWM variable-frequency power sources feedback energy processing units and method |
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| CN118611456A (en) * | 2024-08-07 | 2024-09-06 | 惠州市乐亿通科技股份有限公司 | Inverter and energy-saving control system thereof |
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Application publication date: 20190705 |