CN100403641C - Separate symmetrical half-wave circuit based current control method - Google Patents
Separate symmetrical half-wave circuit based current control method Download PDFInfo
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- CN100403641C CN100403641C CNB2003101166701A CN200310116670A CN100403641C CN 100403641 C CN100403641 C CN 100403641C CN B2003101166701 A CNB2003101166701 A CN B2003101166701A CN 200310116670 A CN200310116670 A CN 200310116670A CN 100403641 C CN100403641 C CN 100403641C
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Abstract
The present invention discloses a current control method based on an independent symmetrical half-wave circuit. The independent symmetrical half-wave circuit is controlled by the proportion-integral (PI) adjusting output of a voltage ring and a current ring to carry out AC/DC conversion. The PI adjustment is implemented by the executive program of a microprocessor. In the current control method, the output of the voltage ring is converted into an amplitude value component of a target current of a fundamental wave; a sampling three-phase input voltage is adjusted in a phase locking way and is calculated to obtain a fundamental wave phase angle of each phase, and a corresponding sinusoidal value of the fundamental wave phase angle of each phase is at least obtained according to the fundamental wave phase angle namely a phase angle component of the target current; the instantaneous target quantity of a fundamental wave current is calculated according to the amplitude value component of the target current and the phase angle component; the absolute value of the instantaneous value of a sampling three-phase input current is respectively taken as a feedback component controlled by the current ring; the difference of the instantaneous target quantity and the feedback component is calculated; a PI adjusting calculation is carried out for he difference to obtain control quantity; the independent symmetrical half-wave circuit is controlled by the control quantity.
Description
Technical field
The present invention relates to the rectification control technology, relate in particular to a kind of current control method based on independent symmetrical half-wave circuit.
Background technology
Its main road rectifier of traditional three-phase UPS adopts the topological structure of three phase full bridge more, and the mode that articulates of its battery also is varied.And consider that from the cost angle rectifier part is all very responsive to the number and the inductive capacity of insulation gate pole bipolar transistor (IGBT) module.Therefore, adopting Vienna-class (VIENNA-like) circuit then is a kind of new trial as the UPS rectifier, and this is because the VIENNA-like circuit itself has plurality of advantages.It can be shared with the IGBT and the battery PFC IGBT partly of main road rectifier PFC part, and its circuit diagram as shown in Figure 1.
As can be known from Fig. 1, battery powered whole pfc circuit all can be used the pfc circuit of main road power supply, has so not only saved the IGBT power model of pfc circuit, also saved the PFC inductance, not only save cost, also reduced system bulk, made entire circuit and system configuration seem simple and convenient.And 6 road BOOST circuit are relatively independent, and wherein each Lu Junke controls separately, and the system of being convenient to separates lotus root.
Because adopting three-phase independently controls, therefore needing to carry out positive-negative half-cycle in whole power frequency period judges, especially the positive-negative half-cycle of each power frequency period is judged, and the judgement more complicated of zero crossing, and its accuracy directly influences the control result and the performance index of system; Simultaneously, also to carry out loaded down with trivial details symbolic operation.
Summary of the invention
The object of the present invention is to provide a kind of current control method, to simplify control based on independent symmetrical half-wave circuit.
Realize technical scheme of the present invention:
A kind of current control method based on independent symmetrical half-wave circuit, the symmetrical half-wave circuit of this independence is carried out the ac/dc conversion under the control of Voltage loop and electric current loop ratio-integration adjusting output, and described ratio-integration is regulated by the microprocessor executive program and is realized; It is characterized in that the method comprising the steps of:
The first step, Voltage loop output is converted to the target current amplitude components of first-harmonic;
Second step, the three-phase input voltage of sampling is carried out phase-locked adjusting, calculate the first-harmonic phase angle, and obtain the sine value of first-harmonic phase angle correspondence, i.e. the phase angle component of target current at least according to the first-harmonic phase angle;
The 3rd goes on foot, calculates according to the phase angle component of described target current amplitude components and target current the fast-opening target amount of fundamental current;
The 4th step, get the absolute value of instantaneous value of three-phase input current of sampling as the feedback component of current loop control respectively;
The difference of the 5th step, the described fast-opening target amount of calculating and described feedback component is carried out ratio-integration to this difference and is regulated the controlled amount of computing, and controls the symmetrical half-wave circuit of described independence by this controlled quentity controlled variable.
Wherein:
Also calculate the sine value of each harmonic phase angle correspondence in second step, and the sine value sum that these harmonic sine values are corresponding with the first-harmonic phase angle is as the phase angle component of the target current in the 3rd step.
In the 5th step, also introduce feed-forward regulation component and described controlled quentity controlled variable acting in conjunction in the symmetrical half-wave circuit of described independence.
Obtain the sine value of first-harmonic phase angle correspondence by tabling look-up according to phase-locked loop output.
The present invention controls independent symmetrical half-wave circuit by the instantaneous absolute value of electric current, has simplified the complexity of control widely; In control, inject the Harmonics of Input aberration rate that humorous wave energy effectively improves system, thus kind rectification performance.
Compare with the controlling schemes that does not adopt absolute value control, the present invention not only control structure is simple, and can effectively save the operation time of CPU, when the system of assurance finishes complex calculation, improves the switching frequency of system; Simultaneously, make comparatively complicated harmonic compensation algorithm obtain effective simplification.
Description of drawings
Fig. 1 is the VIENNA-like rectification circuit schematic diagram of three-phase uninterrupted power supply (UPS);
Fig. 2 is the theory diagram of UPS;
Fig. 3 is the system block diagram of the absolute value Current Control of VIENNA rectification circuit;
Fig. 4 is a flow chart of the present invention.
Embodiment
Present embodiment is that example describes with the uninterrupted power supply (ups) Unity that adopts the VIENNA-like rectification circuit.Consult shown in Figure 2ly, UPS mainly comprises VIENNA-like main circuit, IGBT drive circuit, check-out console (or claiming testing circuit) and digital signal processor (DSP).The Voltage loop that is used to control and the pi regulator of electric current loop are realized by executive program by DSP.The VIENNA-like main circuit is converted to direct current with the alternating current of importing and exports by dc bus under the power drive signal controlling of IGBT drive circuit output.The dc bus of check-out console from main circuit obtains the voltage and current signal and feeds back to DSP, and the pi regulator computing and the output of being correlated with by DSP are used for pulse-width signal (PWM), produces the power drive signal with this pulse-width signal control IGBT circuit.
Because the positive brachium pontis of VIENNA-like circuit, negative brachium pontis be symmetry fully, therefore, can simplify control from aspects such as sampling, filtering and algorithms.The present invention simplifies the control of VIENNA-like circuit, is its desired value with current instantaneous value I*sin (wt), and wherein sin (wt) exports the sine value of the gained of tabling look-up for PLL; Its amplitude I then by Voltage loop output gained, consults shown in Figure 3.
Complete symmetry according to the VIENNA-like circuit, the single channel regulator structure that block diagram shown in Figure 3 is only controlled for system, Ir is the single-phase input current of UPS rectifier, because of any moment, the sense of current that flows through same inductance is always identical, because of in one-period, the electric current that flows through two power factor correctors (PFC) inductance of same brachium pontis is respectively the positive and negative half cycle of same phase input current, can avoid the common problem of brachium pontis again.This also is in when normally sending out wavy attitude as the IGBT of last (or down) brachium pontis with regard to having determined, can be arbitrary value (certain, pulse duration should not be made as limiting value in practice) with the IGBT pulse duration of brachium pontis correspondence.Exactly because also this characteristic of VIENNA-like circuit can not consider that sense of current controls it, therefore, can take absolute value to feedback current amount (being input current), is translated into half-wave current.When this phase current flows through this road booster converter (BOOST), can control according to this current instantaneous value; And when electric current flows through same brachium pontis BOOST circuit, because of the IGBT pulsewidth unrestricted, therefore, also can send out ripple, so not only simplify the control of system, simultaneously according to the amount of calculation of adjuster, and also saved the comparatively complicated time-consuming symbolic operation that has, to the simplification controller architecture, system optimizing control, improving computational speed all has effect preferably.
Simultaneously, as can be seen from Figure 3, in rectifier control, the method of having introduced the harmonic wave injection reduces the current harmonics aberration rate (iTHD) of system's input side, the aim parameter of its each harmonic and the aim parameter of first-harmonic are for simply adding and mode, therefore, when in system, introducing the harmonic wave injection of closed loop, also can adopt the transient current control of absolute value as need.Its control method is identical with the control method of first-harmonic, and just the phase angle of each harmonic target current becomes integral multiple with the phase angle of first-harmonic target current.Can effectively improve the Harmonics of Input aberration rate (iTHD) of system like this, thereby improve the rectifier performance.
In conjunction with Fig. 2, Fig. 3 and Fig. 4, the concrete processing of the instantaneous absolute value Current Control of VIENNA-like circuit is described below:
Step 10: the target current amplitude components that is converted to first-harmonic is calculated in Voltage loop output through calibration.
Step 20: detect three-phase input voltage, calculate current fundamental phase angle through phase-locked loop (PLL) adjuster, as the phase angle component of given target current.
Step 30: draw the corresponding phase angle component of each harmonic according to the first-harmonic phase angle component that calculates, calculate the sine value of first-harmonic and each harmonic according to corresponding phase angle component, and obtain all sine values and.Wherein each harmonic comprises 3,5,7 subharmonic.
Step 40: according to fast-opening target value target current amplitude components in the step 10 and the sine value in the step 30 and that calculate first-harmonic and each harmonic.
Step 50: the three-phase input current of difference detection system according to the circuit characteristic of VIENNA-like, takes absolute value the three-phase input current that detects gained, as the feedback quantity of electric current loop adjuster.
Step 60: the difference of calculating fast-opening target value and feedback quantity;
Step 70: described difference is carried out PI regulate the output controlled quentity controlled variable, realize absolute value control to the VIENNA-like circuital current.
In step 70, also can introduce feed-forward regulation component and described controlled quentity controlled variable acting in conjunction in the VIENNA-like circuit.This feed-forward regulation component can be drawn by the ratio gain of export target amount and input variable, and its purpose is to improve the rapidity of system.
Also can not inject harmonic wave in said process, promptly can not calculate the phase angle component and the sine value thereof of 3,5,7 subharmonic in the step 30, step 40 item only adopts the sine value of first-harmonic and target current amplitude components to calculate the fast-opening target value.
Though the circuit topological structure of above VIENNA-like with UPS is that example describes, other half-wave symmetric circuit topological structures all can adopt instantaneous absolute value current control method, and it is realized with in like manner above-mentioned.
Claims (5)
1. based on the current control method of independent symmetrical half-wave circuit, the symmetrical half-wave circuit of this independence is carried out the ac/dc conversion under the control of Voltage loop and electric current loop ratio-integration adjusting output, and described ratio-integration is regulated by the microprocessor executive program and realized; It is characterized in that the method comprising the steps of:
The first step, Voltage loop output is converted to the target current amplitude components of first-harmonic;
Second step, the three-phase input voltage of sampling is carried out phase-locked adjusting, calculate the first-harmonic phase angle, and obtain the sine value of first-harmonic phase angle correspondence, i.e. the phase angle component of target current at least according to the first-harmonic phase angle;
The 3rd goes on foot, calculates according to the phase angle component of described target current amplitude components and target current the fast-opening target amount of fundamental current;
The 4th step, get the absolute value of instantaneous value of three-phase input current of sampling as the feedback component of current loop control respectively;
The difference of the 5th step, the described fast-opening target amount of calculating and described feedback component is carried out ratio-integration to this difference and is regulated the controlled amount of computing, and controls the symmetrical half-wave circuit of described independence by this controlled quentity controlled variable.
2. current control method as claimed in claim 1, it is characterized in that, also calculate the sine value of each harmonic phase angle correspondence in second step, and the sine value sum that these harmonic sine values are corresponding with the first-harmonic phase angle is as the phase angle component of the target current in the 3rd step.
3. method as claimed in claim 1 or 2 is characterized in that, in the 5th step, also introduces feed-forward regulation component and described controlled quentity controlled variable acting in conjunction in the symmetrical half-wave circuit of described independence.
4. the method for claim 1 is characterized in that, obtains the sine value of first-harmonic phase angle correspondence by tabling look-up according to phase-locked loop output.
5. method as claimed in claim 2 is characterized in that described each harmonic is meant 3,5 and 7 subharmonic.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101166701A CN100403641C (en) | 2003-11-26 | 2003-11-26 | Separate symmetrical half-wave circuit based current control method |
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| CNB2003101166701A CN100403641C (en) | 2003-11-26 | 2003-11-26 | Separate symmetrical half-wave circuit based current control method |
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| CN100403641C true CN100403641C (en) | 2008-07-16 |
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| CN115333390A (en) * | 2022-08-16 | 2022-11-11 | 长沙航特电子科技有限公司 | Current loop control method and system of rectifier and readable storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1034042C (en) * | 1993-08-19 | 1997-02-12 | 三菱电机株式会社 | Control apparatus for power converter |
| JP2002027756A (en) * | 2000-07-03 | 2002-01-25 | Mitsubishi Electric Corp | Method and device for controlling current of converter and pwm converter using this current control device |
| US6594164B2 (en) * | 2000-02-25 | 2003-07-15 | Kabushiki Kaisha Toshiba | PWM controlled power conversion device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1034042C (en) * | 1993-08-19 | 1997-02-12 | 三菱电机株式会社 | Control apparatus for power converter |
| US6594164B2 (en) * | 2000-02-25 | 2003-07-15 | Kabushiki Kaisha Toshiba | PWM controlled power conversion device |
| JP2002027756A (en) * | 2000-07-03 | 2002-01-25 | Mitsubishi Electric Corp | Method and device for controlling current of converter and pwm converter using this current control device |
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| CN1622441A (en) | 2005-06-01 |
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