CN109842316A - The double feed forward control method of DC-AC converter - Google Patents
The double feed forward control method of DC-AC converter Download PDFInfo
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- CN109842316A CN109842316A CN201910174879.4A CN201910174879A CN109842316A CN 109842316 A CN109842316 A CN 109842316A CN 201910174879 A CN201910174879 A CN 201910174879A CN 109842316 A CN109842316 A CN 109842316A
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Abstract
The present invention relates to power electronics fields, the present invention is to solve the control method stability of existing DC-AC converter is poor and control structure challenge, it is proposed a kind of double feed forward control method of DC-AC converter, this method is while remaining existing voltage and current double closed-loop feedback control, the reference input of Voltage loop is on the basis of current reference voltage, it has been superimposed current output voltage virtual value feedforward amount, after the output valve of electric current loop is performed corresponding processing, it has been superimposed output voltage feedforward amount, when eliminating deviation between reference value and output valve, system interference is quickly eliminated by the superposition of two feedforward amounts, while improving the dynamic responding speed and stability of DC-AC converter, also retain the advantage that PI control structure is simple and robustness is high, improve the reliability of system.
Description
Technical field
The present invention relates to power electronics fields, relate in particular to a kind of control method of DC-AC converter.
Background technique
DC-AC converter is to realize that direct current is converted to the inverter of exchange, and principle is mainly using by semiconductor function
The bridge circuit of rate switching tube composition realizes that direct current energy can to amplitude and frequency by turning on and off for control switch pipe
The conversion of the AC energy of tune.Common DC-AC converter has square-wave inverter, sinusoidal pulse width modulation (SPWM) inverter etc..
The control method of DC-AC converter, what is referred to is exactly the method that control generates pulsewidth modulation drive waveforms PWM, control
The superiority and inferiority of method, directly influence output sinusoidal ac whether standard and stabilization.The control method of common DC-AC converter
There are the control methods such as PI (proportional integration) control, PR (ratio resonance) control, synovial membrane control and Repetitive controller.Although PI control is calculated
Method is simple, but can not accurately track the steady-state error of time-varying sinusoidal signal；Although PR control has good steady-state characteristic, need every
Kind harmonic wave all sets a controller；Synovial membrane control, which depends on, establishes accurate system model to obtain synovial membrane surface function and control
Domain；Repetitive controller can only postpone a cycle and generate control amount, and dynamic property is poor.
In conclusion the control method stability of existing DC-AC converter is poor or control structure is complicated.
Summary of the invention
The invention aims to solve, the control method stability of existing DC-AC converter is poor and control structure is multiple
Miscellaneous problem proposes a kind of double feed forward control method of DC-AC converter.
The technical proposal adopted by the invention to solve the above technical problems is that: the double feed forward control method of DC-AC converter,
Characterized by comprising the following steps:
Step 1. obtains the input terminal DC bus-bar voltage, output voltage and output electric current of DC-AC converter；
Step 2. enables full-bridge driving when the voltage value of the input terminal DC bus-bar voltage reaches exchange output threshold value
Output；
Step 3. obtains the virtual value of current output voltage according to the output voltage, on the basis of Voltage loop reference voltage
On, superposition current output voltage virtual value is input to the reference value input terminal of Voltage loop, the output voltage is input to described
The feedback input end of Voltage loop；
Step 4. is input to the reference value input terminal of electric current loop after performing corresponding processing the output valve of the Voltage loop,
The output electric current is input to the feedback input end of the electric current loop, after the output valve of electric current loop is performed corresponding processing,
Be superimposed output voltage, and according to input terminal DC bus-bar voltage obtain control signal to the pwm signal of inversion full bridge power pipe into
Row control.
Further, it is protected for switch tube, after the step 2 further include:
System enters the soft start stage: by the output valve of standard sine wave generation module and K times of Voltage loop reference voltage
Product is input to the reference value input terminal of Voltage loop, and the K is gradually increased to preset value by 0 less than 1, K, when K increase to it is default
After value, the system soft start stage terminates, and cuts off the reference value input terminal of the Voltage loop, enters step 3.
Further, to improve soft start efficiency, the value range of the K is 0.5≤K≤0.9.
It further, is acquisition current output voltage virtual value, it is described to be worked as according to output voltage acquisition in step 3
The virtual value of preceding output voltage includes:
The output voltage is calculated to the virtual value for obtaining current output voltage through Sinusoid Analysis module.
It further, is the reference voltage value for obtaining exchanging ring, in step 4, the output valve by Voltage loop carries out phase
The processing answered includes:
Saturation limiting processing is carried out to the output valve of the Voltage loop.
Further, described to perform corresponding processing the output valve of electric current loop in step 4 to obtain pwm control signal
Afterwards, it is superimposed output voltage, and control signal is obtained according to input terminal DC bus-bar voltage and includes:
It after the output valve of electric current loop is carried out saturation limiting processing, is added with output voltage, then female divided by input terminal direct current
Line voltage obtains control signal.
It further, is the safety for improving system, the double feed forward control method of the DC-AC converter further include:
Input terminal DC bus-bar voltage, output voltage and the output electric current of real-time monitoring DC-AC converter, and according to correspondence
Voltage threshold and current threshold judge whether under-voltage, over-voltage or overcurrent, if so, issue alarm and close full-bridge driving output.
The beneficial effects of the present invention are: the double feed forward control method of DC-AC converter of the present invention, compares existing skill
Art remains voltage and current double closed-loop feedback control, and the reference input of Voltage loop is folded on the basis of current reference voltage
Add current output voltage virtual value feedforward amount, after performing corresponding processing the output valve of electric current loop, is superimposed output electricity
Feedforward amount is pressed, when eliminating deviation between reference value and output valve, system interference is quickly eliminated by the superposition of two feedforward amounts,
While improving the dynamic responding speed and stability of DC-AC converter, also retains PI control structure simply and robustness is high
The advantages of, improve the reliability of system.
Detailed description of the invention
Fig. 1 is the flow diagram of the double feed forward control method of DC-AC converter described in the embodiment of the present invention；
Description of symbols:
Sine_An- Sinusoid Analysis module；Sine_Gen- sine wave generation module；PI_uac- Voltage loop；PI_iac-
Electric current loop；The virtual value of uac_rms- current output voltage；Uac_ref- Voltage loop reference voltage；The reference of iac_ref- electric current loop
Voltage；Uac_fbk- output voltage；Iac_fbk- exports electric current；Vbus_fbk- input terminal DC bus-bar voltage；iac_duty-
Electric current loop output signal；Duty- controls signal；Ref- reference value input terminal；Fbk- feedback input end；A- system worked well rank
Section；The B- system soft start stage.
Specific embodiment
Embodiments of the present invention are described in detail below in conjunction with attached drawing.
The double feed forward control method of DC-AC converter of the present invention, comprising the following steps: step 1. obtains DC-AC
Input terminal DC bus-bar voltage, output voltage and the output electric current of converter；Step 2. works as the input terminal DC bus-bar voltage
Voltage value reach exchange output threshold value when, enable full-bridge driving output；Step 3. obtains current defeated according to the output voltage
The virtual value of voltage out, on the basis of Voltage loop reference voltage, superposition current output voltage virtual value is input to Voltage loop
The output voltage is input to the feedback input end of the Voltage loop by reference value input terminal；Step 4. is by the Voltage loop
Output valve is input to the reference value input terminal of electric current loop after performing corresponding processing, the output electric current is input to the electric current
The feedback input end of ring after performing corresponding processing the output valve of electric current loop, is superimposed output voltage, and according to input terminal direct current
Busbar voltage obtains control signal and controls the pwm signal of inversion full bridge power pipe.
Present invention preserves voltage and current double closed-loop feedback controls, and the reference input of Voltage loop is in current reference voltage
On the basis of, it has been superimposed current output voltage virtual value feedforward amount, after the output valve of electric current loop is performed corresponding processing, superposition
The instantaneous voltage value feedforward amount of output voltage, when, which there is interference, in system generates fluctuation, the feedforward of current output voltage virtual value
Amount and the instantaneous voltage value feedforward amount of output voltage can be reacted to the input terminal of voltage and current PI controller at once, i.e., electric
The input terminal of pressure ring and electric current loop, Voltage loop and electric current loop change control output according to the size of feedforward amount, before two
The superposition of feedback amount interferes bring to influence to realize quickly to eliminate,
Embodiment
The double feed forward control method of DC-AC converter described in the embodiment of the present invention, as shown in Figure 1, comprising the following steps:
Step 1. obtains input terminal DC bus-bar voltage Vbus_fbk, the output voltage uac_fbk of DC-AC converter and defeated
Electric current iac_fbk out；
Before this, corresponding threshold value can be initialized and is arranged to system, and the acquisition of voltage and current can lead to
Overvoltage mutual inductor and current transformer or other signal acquisition modules are to DC bus-bar voltage Vbus_fbk, output voltage uac_
Fbk and output electric current iac_fbk are acquired, to obtain corresponding voltage value and current value.
Step 2. is enabled when the voltage value of the input terminal DC bus-bar voltage Vbus_fbk reaches exchange output threshold value
Full-bridge driving output；
Exchange output threshold value is arranged according to the actual situation, and e.g., exchange output threshold value is 180V, if input terminal DC bus electricity
The voltage value of Vbus_fbk is pressed not up to exchange output threshold value, then not enabled full-bridge driving output.
Optionally, to avoid the duty ratio of PWM driving output from increasing suddenly, the electric current that moment is connected in switching tube is too big split
It closes pipe to damage, after enabling full-bridge driving output, system enters the soft start stage: by standard sine wave generation module Sine_
The output valve of Gen and the product of K times of Voltage loop reference voltage uac_ref are input to the reference value input terminal of Voltage loop PI_uac
Ref, the K are gradually increased to preset value by 0 less than 1, K, and after K increases to preset value, the system soft start stage terminates, cutting
The reference value input terminal Ref of the Voltage loop PI_uac, enters step 3.
It is understood that as shown in Figure 1, the reference value input terminal Ref of gate voltage ring PI_uac first and standard just
The output valve of string wave generation module Sine_Gen and the product of K times of Voltage loop reference voltage uac_ref export, i.e. dotted line B connection,
Dotted line A is disconnected, in the ascending input voltage ring reference voltage of reference value input terminal Ref of Voltage loop PI_uac, e.g., in voltage
The output valve and 0.5 times of Voltage loop of the reference value input terminal Ref input standard sine wave generation module Sine_Gen of ring PI_uac
The product of reference voltage uac_ref, after setting time, then input the output valve of standard sine wave generation module Sine_Gen with
The product of 0.6 times of Voltage loop reference voltage uac_ref, until K increases to preset value, the duty ratio for exporting driving gradually increases
Add, switching tube is avoided to damage, the value range of K can enter back into just after the system soft start stage for 0.5≤K≤0.9
Normal working stage, i.e. dotted line A connection, dotted line B are disconnected, and enter step 3.
Step 3. obtains the virtual value uac_rms of current output voltage according to the output voltage uac_fbk, in Voltage loop
On the basis of reference voltage uac_ref, superposition current output voltage virtual value uac_rms is input to the reference of Voltage loop PI_uac
It is worth input terminal Ref, the output voltage uac_fbk is input to the feedback input end Fbk of the Voltage loop PI_uac；
It is obtained currently wherein it is possible to which output voltage uac_fbk is input to Sinusoid Analysis module Sine_An and calculate
The virtual value uac_rms of output voltage is input to Voltage loop PI_uac's after being added it with Voltage loop reference voltage uac_ref
Reference value input terminal Ref, exports after proportional integration calculates, and it is defeated to complete first reference value for being superimposed upon Voltage loop PI_uac
Enter to hold the feedforward control of Ref.
Step 4. is input to electric current loop PI_iac's after performing corresponding processing the output valve of the Voltage loop PI_uac
The output electric current iac_fbk is input to the feedback input end Fbk of the electric current loop PI_iac by reference value input terminal Ref, will
After the output valve of electric current loop PI_iac performs corresponding processing, it is superimposed output voltage uac_fbk, and according to input terminal DC bus
Voltage Vbus_fbk obtains control signal duty and controls the pwm signal of inversion full bridge power pipe.
Wherein, performing corresponding processing to the output valve of Voltage loop PI_uac can be to carry out saturation limiting processing to it,
Electric current loop reference voltage iac_ref is obtained after processing, is input to the reference value input terminal Ref of electric current loop PI_iac, and will
The feedback input end Fbk that output electric current iac_fbk is input to electric current loop PI_iac can be to electric current after proportional integration calculates
The output valve of ring PI_iac obtains electric current loop output signal iac_duty after carrying out saturation limiting processing.It is female according to input terminal direct current
Line voltage Vbus_fbk obtains control signal duty, by electric current loop output signal iac_duty and output voltage uac_
After fbk is added, then divided by input terminal DC bus-bar voltage Vbus_fbk, to obtain the PWM control letter of inversion full bridge power pipe
Number duty completes second feedforward control for being superimposed upon the output end of electric current loop PI_iac.
Optionally, the double feed forward control method of DC-AC converter described in the present embodiment, further includes:
Input terminal DC bus-bar voltage, output voltage and the output electric current of real-time monitoring DC-AC converter, and according to correspondence
Voltage threshold and current threshold judge whether under-voltage, over-voltage or overcurrent, if so, issue alarm and close full-bridge driving output.
Wherein, corresponding voltage threshold and current threshold are arranged according to the actual situation, including input terminal DC bus-bar voltage
Threshold value, output voltage threshold value and output current threshold, pass through input terminal DC bus-bar voltage, output voltage and the output that will test
Electric current is compared with corresponding threshold value, and then judges whether that under-voltage, over-voltage or overcurrent occurs, and improves the safety of system.
Claims (7)
- The double feed forward control method of 1.DC-AC converter, which comprises the following steps:Step 1. obtains the input terminal DC bus-bar voltage, output voltage and output electric current of DC-AC converter；It is defeated to enable full-bridge driving when the voltage value of the input terminal DC bus-bar voltage reaches exchange output threshold value for step 2. Out；Step 3. obtains the virtual value of current output voltage according to the output voltage, on the basis of Voltage loop reference voltage, Superposition current output voltage virtual value is input to the reference value input terminal of Voltage loop, and the output voltage is input to the voltage The feedback input end of ring；Step 4. is input to the reference value input terminal of electric current loop after performing corresponding processing the output valve of the Voltage loop, by institute The feedback input end that output electric current is input to the electric current loop is stated, after the output valve of electric current loop is performed corresponding processing, superposition Output voltage, and control signal is obtained according to input terminal DC bus-bar voltage, the pwm signal of inversion full bridge power pipe is controlled System.
- 2. the double feed forward control method of DC-AC converter as described in claim 1, which is characterized in that after the step 2 also Include:System enters the soft start stage: by the product of the output valve of standard sine wave generation module and K times of Voltage loop reference voltage It is input to the reference value input terminal of Voltage loop, the K is gradually increased to preset value by 0 less than 1, K, after K increases to preset value, The system soft start stage terminates, and cuts off the reference value input terminal of the Voltage loop, enters step 3.
- 3. the double feed forward control method of DC-AC converter as claimed in claim 2, which is characterized in that the value range of the K For 0.5≤K≤0.9.
- 4. the double feed forward control method of DC-AC converter as described in claim 1, which is characterized in that in step 3, described Include: according to the virtual value that the output voltage obtains current output voltageThe output voltage is calculated to the virtual value for obtaining current output voltage through Sinusoid Analysis module.
- 5. the double feed forward control method of DC-AC converter as described in claim 1, which is characterized in that described to incite somebody to action in step 4 The output valve of Voltage loop, which performs corresponding processing, includes:Saturation limiting processing is carried out to the output valve of the Voltage loop.
- 6. the double feed forward control method of DC-AC converter as described in claim 1, which is characterized in that described to incite somebody to action in step 4 After the output valve of electric current loop performs corresponding processing, it is superimposed output voltage, and controlled according to input terminal DC bus-bar voltage Signal includes:It after the output valve of electric current loop is carried out saturation limiting processing, is added with output voltage, then divided by input terminal DC bus electricity Pressure obtains control signal.
- 7. the double feed forward control method of DC-AC converter as described in claim 1, which is characterized in that further include:Input terminal DC bus-bar voltage, output voltage and the output electric current of real-time monitoring DC-AC converter, and according to corresponding electricity Pressure threshold value and current threshold judge whether under-voltage, over-voltage or overcurrent, alarm and close full-bridge driving output if so, issuing.
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| CN201910174879.4A CN109842316A (en) | 2019-03-08 | 2019-03-08 | The double feed forward control method of DC-AC converter |
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| CN201910174879.4A CN109842316A (en) | 2019-03-08 | 2019-03-08 | The double feed forward control method of DC-AC converter |
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| CN112564517A (en) * | 2020-12-16 | 2021-03-26 | 四川长虹电器股份有限公司 | Double feedforward control method of DCAC converter |
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