CN102710153A - Modeling method of single-phase bridge-type three-level rectifier - Google Patents
Modeling method of single-phase bridge-type three-level rectifier Download PDFInfo
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Abstract
The invention discloses a modeling method of a single-phase bridge-type three-level rectifier, which comprises the following steps of: judging whether a control signal is input in an input side of the rectifier; if so, summarizing a relationship between output potentials of input points of a first bridge arm and a second bridge arm relative to a midpoint and AC side voltage output by the rectifier, a relationship among upper bridge arm current of the first bridge arm, upper bridge arm current of the second bridge arm and upper bridge arm current and a relationship among lower bridge current of the first bridge arm, lower bridge arm current of the second bridge arm and lower bridge arm current according to the signal control modes of the first bridge arm and the second bridge arm and a current direction of input current; and if not, comparing grid side voltage and the DC side intermediate voltage and summarizing a relationship between the AC side voltage and the DC side intermediate voltage of the rectifier and a relationship between the AC side current and the intermediate current of the rectifier according to the conduction situation of a diode. The modeling method disclosed by the invention is simple in implementation steps, small in calculated amount and convenient and rapid for modeling of the rectifier.
Description
Technical field
The present invention relates to the modeling technique field of rectifier, more particularly, relate to a kind of modeling method of single-phase bridge three level rectifiers.
Background technology
At present; Progress along with science and technology; Exchanging transmission becomes an important directions of railway dragging transmission development; For mainly comprising the AC-DC-AC converter of rectifier, intermediate dc link and inverter, wherein rectifier is one of emphasis that exchanges at present Research on transmission as the core devices that exchanges transmission.
Common rectifier mainly contains single-phase bridge two level rectifiers and single-phase bridge three level rectifiers in exchanging the transmission main circuit; Relative single-phase bridge two level rectifiers, single-phase bridge three level rectifiers have the electromagnetic interference of minimizing, reduce the power switch pipe voltage strength, reduce switching frequency, make the input electric current more near advantages such as the remarkable minimizings of sinusoidal harmonic content.Therefore, the application of single-phase bridge three level rectifiers in exchanging transmission field more and more widely.If the modeling method of single-phase bridge three level rectifier fast and stables can be provided, will effective means and instrument be provided for analysis, design and the improvement of trailer system.
At present, single-phase bridge three level rectifiers adopt usually and utilize the converter module that carries in the SimPowerSystem module library of MATLAB emulation to build the modeling method and the switch function modeling method of single-phase bridge three level rectifiers.
But; Since utilize the current transformer that carries in the SimPowerSystem module library of MATLAB emulation the three-level inverter modeling details of a lot of rectifiers; Be often used for off-line simulation; Under the situation of system's real-time simulation, this modeling method is too careful can not to reach the fireballing requirement of system emulation, and in real-time simulation, also runs into easily and can't download the problem inaccurate with algorithm.
Utilization switch function modeling method is accomplished the modeling method of single-phase bridge three level rectifiers; Get in touch owing in state equation, need set up with the electric parameters in circuit on side of overhead contact line, DC side loop; Artificially the Mathematical Modeling of rectifier and the Mathematical Modeling of circuit on side of overhead contact line and intermediate loop are coupled, this will be unfavorable for that the rectifier model applies in a flexible way in all kinds of interchange transmission main circuit topology frameworks; Simultaneously, because state equation receives the restriction of calculation method in the process of finding the solution, even, will cause state variable to be found the solution and disperse because algorithm picks is improper; And this method does not have to consider to be unfavorable for the integrality and the authenticity of rectifier modeling to not controlling the simulation of rectification.
Summary of the invention
In view of this, the present invention provides a kind of modeling method of single-phase bridge three level rectifiers, and is simple with performing step, amount of calculation is little and conveniently single-phase bridge three level rectifiers are carried out modeling.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of modeling method of single-phase bridge three level rectifiers comprises:
Judge whether the pwm control signal input is arranged in the input side of rectifier;
If have; Then according to the sense of current of input current in the input side of the pattern of the pwm control signal of said rectifier first brachium pontis and second brachium pontis and said rectifier; Draw the conducting situation of said rectifier bridge arm, and summarize according to the conducting situation of said brachium pontis:
The first brachium pontis input point of said rectifier is with respect to the output potential of mid point, the second brachium pontis input point relation with respect to the AC side voltage of the output potential of mid point and the output of said rectifier;
The relation of the last brachium pontis electric current of the last brachium pontis electric current of first brachium pontis of said rectifier, the last brachium pontis electric current of second brachium pontis and said rectifier;
The relation of the following brachium pontis electric current of the following brachium pontis electric current of first brachium pontis of said rectifier, the following brachium pontis electric current of second brachium pontis and said rectifier;
Otherwise the size of the DC side intermediate voltage of the voltage on line side of more said rectifier and said rectifier then draws the conducting situation of diode in the said rectifier, and summarizes according to the conducting situation of diode in the said rectifier:
The relation of the AC side voltage of said rectifier and the DC side intermediate voltage of said rectifier;
The relation of the ac-side current of said rectifier and the intermediate current of said rectifier.
Preferably, the pattern of the pwm control signal of said rectifier is " height is low ", " low height is low ", " low height ", " low height " perhaps " low high ".
Preferably, the sense of current of input current is more than or equal to zero direction or less than zero direction in the input side of said rectifier.
Preferably, the first brachium pontis input point of the said rectifier of said conclusion is specially with respect to the relation of the AC side voltage that the output potential and the rectifier of mid point are exported with respect to output potential, the second brachium pontis input point of mid point:
According to the sense of current of input current in the input side of different pwm control signal of importing and said rectifier, draw the conducting situation of said rectifier first brachium pontis and second brachium pontis;
According to the conducting situation of said rectifier first brachium pontis and second brachium pontis, the first brachium pontis input point that detects the AC side magnitude of voltage of said rectifier output, said rectifier is with respect to the output potential value of mid point and the second brachium pontis input point output potential value with respect to mid point;
The AC side magnitude of voltage of more detected said rectifier output, the first brachium pontis input point of said rectifier are confirmed the AC side voltage of said rectifier output, said rectifier with respect to the output potential value and the second brachium pontis input point of mid point with respect to the output potential value of mid point the first brachium pontis input point is with respect to the output potential of mid point and the second brachium pontis input point relation with respect to the output potential of mid point.
Preferably, the first brachium pontis input point of said rectifier with respect to output potential, the second brachium pontis input point of mid point with respect to the relation of the AC side voltage that the output potential and the said rectifier of mid point are exported is:
U
ac=U
U-U
V；
Wherein, U
AcAC side voltage for rectifier output; U
UThe first brachium pontis input point is with respect to the output potential of mid point; U
VThe first brachium pontis input point is with respect to the output potential of mid point.
Preferably, the relation of last brachium pontis electric current of last brachium pontis electric current and said rectifier of concluding last brachium pontis electric current, second brachium pontis of first brachium pontis of said rectifier is specially:
According to the sense of current of input current in the input side of different pwm control signal of importing and said rectifier, draw the conducting situation of brachium pontis on said rectifier first brachium pontis and second brachium pontis;
According to the conducting situation of brachium pontis on said rectifier first brachium pontis and second brachium pontis, detect the last brachium pontis current value of said rectifier first brachium pontis, the last brachium pontis current value of second brachium pontis and the last brachium pontis current value of said rectifier;
The last brachium pontis current value of the last brachium pontis current value of more detected said rectifier first brachium pontis, the last brachium pontis current value of second brachium pontis and said rectifier is confirmed the relation of last brachium pontis electric current of last brachium pontis electric current and said rectifier of last brachium pontis electric current, second brachium pontis of first brachium pontis of said rectifier.
Preferably, the relation of the last brachium pontis electric current of the last brachium pontis electric current of the last brachium pontis electric current of first brachium pontis of said rectifier, second brachium pontis and said rectifier is:
i
dcu=i
uU+i
uV；
Wherein, i
DcuLast brachium pontis electric current for rectifier; i
UUIt is brachium pontis electric current on first brachium pontis; i
UVIt is brachium pontis electric current on second brachium pontis.
Preferably, the relation of following brachium pontis electric current of following brachium pontis electric current and said rectifier of concluding following brachium pontis electric current, second brachium pontis of first brachium pontis of said rectifier is specially:
According to the sense of current of input current in the input side of different pwm control signal of importing and said rectifier, draw the conducting situation of brachium pontis under said rectifier first brachium pontis and second brachium pontis;
According to the conducting situation of brachium pontis under said rectifier first brachium pontis and second brachium pontis, detect the following brachium pontis current value of said rectifier first brachium pontis, the following brachium pontis current value of second brachium pontis and the following brachium pontis current value of said rectifier;
The following brachium pontis current value of the following brachium pontis current value of more detected said rectifier first brachium pontis, the following brachium pontis current value of second brachium pontis and said rectifier is confirmed the relation of following brachium pontis electric current of following brachium pontis electric current and said rectifier of following brachium pontis electric current, second brachium pontis of first brachium pontis of said rectifier.
Preferably, the relation of the following brachium pontis electric current of the following brachium pontis electric current of the following brachium pontis electric current of first brachium pontis of said rectifier, second brachium pontis and said rectifier is:
i
dcd=i
dU+i
dV；
Wherein, i
DcdFollowing brachium pontis electric current for rectifier; i
DUIt is brachium pontis electric current under first brachium pontis; i
DVIt is brachium pontis electric current under second brachium pontis.
Preferably, the relation of DC side intermediate voltage of concluding AC side voltage and the said rectifier of said rectifier is specially:
Detect and the size of the DC side intermediate voltage value of the voltage on line side value of more said rectifier and said rectifier, draw the conducting situation of diode in the said rectifier; According to the conducting situation of diode in the said rectifier, detect the AC side magnitude of voltage of said rectifier;
The DC side intermediate voltage value of the voltage on line side value of more detected said rectifier, said rectifier and the AC side magnitude of voltage of said rectifier are confirmed the DC side intermediate voltage of the voltage on line side of said rectifier, said rectifier and the AC side voltage relationship of said rectifier.
Preferably, the AC side magnitude of voltage of rectifier confirms that the DC side intermediate voltage of the voltage on line side of said rectifier, said rectifier and the AC side voltage relationship of said rectifier are:
Work as U
s>U
DcThe time, U
Ac=U
Dc
When-U
s>U
DcThe time, U
Ac=-U
Dc
When | U
s|≤U
DcThe time, U
Ac=U
s
Wherein, U
sVoltage on line side for rectifier; U
AcAC side voltage for rectifier; U
DcDC side intermediate voltage for rectifier.
Preferably, the relation of intermediate current of concluding ac-side current and the said rectifier of said rectifier is specially:
Detect and the size of the DC side intermediate voltage value of the voltage on line side value of more said rectifier and said rectifier, draw the conducting situation of diode in the said rectifier;
According to the conducting situation of diode in the said rectifier, detect the ac-side current value of said rectifier and the intermediate current value of said rectifier;
The ac-side current value of more detected said rectifier and the intermediate current value of said rectifier are confirmed the intermediate current relation of the ac-side current and the said rectifier of said rectifier.
Preferably, the intermediate current of the ac-side current of said rectifier and said rectifier relation is:
Work as U
s>U
DcThe time, i
Dc=| i
Ac|;
When-U
s>U
DcThe time, i
Dc=| i
Ac|;
When | U
s|≤U
DcThe time, i
Dc=0;
Wherein, U
sVoltage on line side for rectifier; U
DcDC side intermediate voltage for rectifier; i
AcBe the ac-side current of rectifier, i
DcIntermediate current for rectifier.
Can find out from above-mentioned technical scheme; The modeling method of rectifier disclosed by the invention; At first through whether the pwm control signal input is arranged in the input side of judging rectifier; Rectifier is divided into pwm control signal input arranged and do not have two kinds of situation of pwm control signal input; When the pwm control signal input is arranged; Can be according to the sense of current of input current in the input side of the pattern of the pwm control signal of rectifier first brachium pontis and second brachium pontis and rectifier; Judge the conducting situation of rectifier bridge arm, and summarize according to the conducting situation of brachium pontis, first brachium pontis of rectifier, the second brachium pontis input point are with respect to the relation of the following brachium pontis electric current of the following brachium pontis electric current of the following brachium pontis electric current of the relation of the last brachium pontis electric current of the last brachium pontis electric current of the last brachium pontis electric current of the relation of the output potential of mid point, rectifier first brachium pontis, second brachium pontis and rectifier and rectifier first brachium pontis, second brachium pontis and said rectifier; When not having the pwm control signal input; The size of the voltage on line side through rectifier relatively and the DC side intermediate voltage of rectifier; Draw the conducting situation of diode in the rectifier, and summarize: the relation of the intermediate current of the relation of the AC side voltage of rectifier and the DC side intermediate voltage of said rectifier, the ac-side current of rectifier and rectifier according to the conducting situation of diode in the rectifier.In the generalization procedure of the voltage and current of above-mentioned rectifier, all need not to carry out complex calculations; Only need conducting situation, just can conveniently summarize relation and the relation between the electric current between the rectifier voltage according to components and parts in different situations judge rectifier.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the circuit diagram of single-phase bridge three level rectifiers disclosed by the invention;
Fig. 2 is the modeling method flow chart of disclosed a kind of single-phase bridge three level rectifiers of the embodiment of the invention;
Fig. 3 is the single-phase bridge three level rectifiers first brachium pontis main circuit diagram disclosed by the invention;
Fig. 4 is not controlled the equivalent-simplification circuit diagram of rectification for single-phase bridge three level rectifiers disclosed by the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The embodiment of the invention discloses a kind of modeling method of single-phase bridge three level rectifiers, simple with performing step, amount of calculation is little and conveniently single-phase bridge three level rectifiers are carried out modeling.
Before the modeling method to single-phase bridge three level rectifiers disclosed by the invention describes, at first introduce single-phase bridge three level rectifiers disclosed by the invention, as shown in Figure 1:
Single-phase bridge three level rectifier main circuits often are made up of 8 full control switching devices, are divided into two brachium pontis, adopt neutral point clamp type structure.Wherein V11～V42 is a main switch, and VD11～VD42 is antiparallel fly-wheel diode, and D1～D4 is a clamping diode.
Wherein, V11, V12, V21, V22 main switch and fly-wheel diode VD11, VD12, VD21, VD22 and clamping diode D1, D2 form single-phase bridge three level rectifiers first brachium pontis; Also can be described as the U brachium pontis, wherein V11, V12 main switch and and fly-wheel diode VD11, VD12 and clamping diode D1 form the last brachium pontis of first brachium pontis; Remaining switching device is formed the following brachium pontis of first brachium pontis.
Wherein, V31, V32, V41, V42 main switch and fly-wheel diode VD31, VD32, VD41, VD42 and clamping diode D3, D4 form single-phase bridge three level rectifiers second brachium pontis; Also can be described as the V brachium pontis; Wherein V31, V32 main switch and and fly-wheel diode VD31, VD32 and clamping diode D3 form the last brachium pontis of second brachium pontis, remaining switching device is formed the following brachium pontis of second brachium pontis.
Wherein, the A point is first brachium pontis (U brachium pontis) electric current input point, and the B point is second brachium pontis (V brachium pontis) electric current input point, and the O point is a brachium pontis intermediate potential datum mark.
The modeling method of disclosed a kind of single-phase bridge three level rectifiers of the embodiment of the invention, as shown in Figure 2, comprising:
S101, judge whether the pwm control signal input is arranged in the input side of rectifier; Then get into step if having
S102, according to the sense of current of input current in the input side of the pattern of the pwm control signal of rectifier first brachium pontis and second brachium pontis and rectifier; Draw the conducting situation of said rectifier bridge arm, and summarize the first brachium pontis input point of rectifier with respect to the output potential of mid point, the second brachium pontis input point relation with respect to the AC side voltage of the output potential of mid point and rectifier output according to the conducting situation of said brachium pontis; The relation of the last brachium pontis electric current of the last brachium pontis electric current of first brachium pontis of rectifier, the last brachium pontis electric current of second brachium pontis and rectifier; The relation of the following brachium pontis electric current of the following brachium pontis electric current of first brachium pontis of rectifier, the following brachium pontis electric current of second brachium pontis and rectifier; Otherwise then get into step
The size of the DC side intermediate voltage of the voltage on line side of S103, comparison rectifier and said rectifier; Draw the conducting situation of diode in the rectifier, and summarize: the relation of the AC side voltage of rectifier and the DC side intermediate voltage of rectifier according to the conducting situation of diode in the rectifier; The relation of the ac-side current of rectifier and the intermediate current of rectifier.
Concrete, the pattern of the pwm control signal of rectifier first brachium pontis is " height is low ", " low height is low ", " low height ", " low height " perhaps " low high ".
Concrete, the sense of current of input current is more than or equal to zero direction or less than zero direction in the input side of rectifier.
Concrete, among the step S102:
The first brachium pontis input point of conclusion rectifier is specially with respect to the relation of the AC side voltage that the output potential and the rectifier of mid point are exported with respect to output potential, the second brachium pontis input point of mid point:
According to the sense of current of input current in the input side of different pwm control signal of importing and said rectifier, draw the conducting situation of said rectifier first brachium pontis and second brachium pontis;
According to the conducting situation of said rectifier first brachium pontis and second brachium pontis, the first brachium pontis input point that detects the AC side magnitude of voltage of said rectifier output, said rectifier is with respect to the output potential value of mid point and the second brachium pontis input point output potential value with respect to mid point;
The AC side magnitude of voltage of more detected said rectifier output, the first brachium pontis input point of said rectifier are confirmed the AC side voltage of said rectifier output, said rectifier with respect to the output potential value and the second brachium pontis input point of mid point with respect to the output potential value of mid point the first brachium pontis input point is with respect to the output potential of mid point and the second brachium pontis input point relation with respect to the output potential of mid point.
The AC side voltage of rectifier output, the first brachium pontis input point of said rectifier with respect to the output potential of mid point and the second brachium pontis input point with respect to the relation of the output potential of mid point are:
U
ac=U
U-U
V；
Wherein, U
AcAC side voltage for rectifier output; U
UThe first brachium pontis input point is with respect to the output potential of mid point; U
VThe first brachium pontis input point is with respect to the output potential of mid point.
The relation of last brachium pontis electric current of last brachium pontis electric current and said rectifier of concluding last brachium pontis electric current, second brachium pontis of first brachium pontis of said rectifier is specially:
According to the sense of current of input current in the input side of different pwm control signal of importing and said rectifier, draw the conducting situation of brachium pontis on said rectifier first brachium pontis and second brachium pontis;
According to the conducting situation of brachium pontis on said rectifier first brachium pontis and second brachium pontis, detect the last brachium pontis current value of said rectifier first brachium pontis, the last brachium pontis current value of second brachium pontis and the last brachium pontis current value of said rectifier;
The last brachium pontis current value of the last brachium pontis current value of more detected said rectifier first brachium pontis, the last brachium pontis current value of second brachium pontis and said rectifier is confirmed the relation of last brachium pontis electric current of last brachium pontis electric current and said rectifier of last brachium pontis electric current, second brachium pontis of first brachium pontis of said rectifier.
The relation of the last brachium pontis electric current of the last brachium pontis electric current of first brachium pontis of rectifier, the last brachium pontis electric current of second brachium pontis and said rectifier is:
i
dcu=i
uU+i
uV；
Wherein, i
DcuLast brachium pontis electric current for rectifier; i
UUIt is brachium pontis electric current on first brachium pontis; i
UVIt is brachium pontis electric current on second brachium pontis.
The relation of following brachium pontis electric current of following brachium pontis electric current and said rectifier of concluding following brachium pontis electric current, second brachium pontis of first brachium pontis of said rectifier is specially:
According to the sense of current of input current in the input side of different pwm control signal of importing and said rectifier, draw the conducting situation of brachium pontis under said rectifier first brachium pontis and second brachium pontis;
According to the conducting situation of brachium pontis under said rectifier first brachium pontis and second brachium pontis, detect the following brachium pontis current value of said rectifier first brachium pontis, the following brachium pontis current value of second brachium pontis and the following brachium pontis current value of said rectifier;
The following brachium pontis current value of the following brachium pontis current value of more detected said rectifier first brachium pontis, the following brachium pontis current value of second brachium pontis and said rectifier is confirmed the relation of following brachium pontis electric current of following brachium pontis electric current and said rectifier of following brachium pontis electric current, second brachium pontis of first brachium pontis of said rectifier.
The relation of the following brachium pontis electric current of the following brachium pontis electric current of first brachium pontis of rectifier, the following brachium pontis electric current of second brachium pontis and said rectifier is:
i
dcd=i
dU+i
dV；
Wherein, i
DcdFollowing brachium pontis electric current for rectifier; i
DUIt is brachium pontis electric current under first brachium pontis; i
DVIt is brachium pontis electric current under second brachium pontis.
Concrete, among the step S103:
The relation of DC side intermediate voltage of concluding AC side voltage and the said rectifier of said rectifier is specially:
Detect and the size of the DC side intermediate voltage value of the voltage on line side value of more said rectifier and said rectifier, draw the conducting situation of diode in the said rectifier; According to the conducting situation of diode in the said rectifier, detect the AC side magnitude of voltage of said rectifier;
The DC side intermediate voltage value of the voltage on line side value of more detected said rectifier, said rectifier and the AC side magnitude of voltage of said rectifier are confirmed the DC side intermediate voltage of the voltage on line side of said rectifier, said rectifier and the AC side voltage relationship of said rectifier.
The AC side magnitude of voltage of rectifier confirms that the DC side intermediate voltage of the voltage on line side of said rectifier, said rectifier and the AC side voltage relationship of said rectifier are:
Work as U
s>U
DcThe time, U
Ac=U
Dc
When-U
s>U
DcThe time, U
Ac=-U
Dc
When | U
s|≤U
DcThe time, U
Ac=U
s
Wherein, U
sVoltage on line side for rectifier; U
AcAC side voltage for rectifier; U
DcDC side intermediate voltage for rectifier.
The relation of intermediate current of concluding ac-side current and the said rectifier of said rectifier is specially:
Detect and the size of the DC side intermediate voltage value of the voltage on line side value of more said rectifier and said rectifier, draw the conducting situation of diode in the said rectifier;
According to the conducting situation of diode in the said rectifier, detect the ac-side current value of said rectifier and the intermediate current value of said rectifier;
The ac-side current value of more detected said rectifier and the intermediate current value of said rectifier are confirmed the intermediate current relation of the ac-side current and the said rectifier of said rectifier.
The ac-side current of said rectifier and the intermediate current of said rectifier relation are:
Work as U
s>U
DcThe time, i
Dc=| i
Ac|;
When-U
s>U
DcThe time, i
Dc=| i
Ac|;
When | U
s|≤U
DcThe time, i
Dc=0;
Wherein, U
sVoltage on line side for rectifier; U
DcDC side intermediate voltage for rectifier; i
AcBe the ac-side current of rectifier, i
DcIntermediate current for rectifier.
In order to make the foregoing description more cheer and bright, below respectively to first brachium pontis of rectifier when having pwm control signal and rectifier analyze when not having pwm control signal.Because the analytic process of second brachium pontis is identical with the analytic process of first brachium pontis, repeats no more at this.
When first brachium pontis of flat rectifier when having pwm control signal, as shown in Figure 3, the single brachium pontis operate as normal of rectifier is also considered the dead band situation; Co-exist in 5 kinds of pwm control signal patterns; That is: 1100 (V11, V12 trigger impulse are high level, and V21, V22 trigger impulse are low level, below the rest may be inferred), 0100,0110,0010,0011; According to the first brachium pontis AC side input current direction of rectifier, integral body can be summarized three kinds of switching tube conduction modes again.The labor result is as shown in table 1.
The rectifier first brachium pontis conducting situation under the different pwm control signal pattern of table 1
In the table, i
InThe first brachium pontis input current for rectifier.
Conclude the above rectifier first brachium pontis conducting situation, can be divided into 3 kinds of conduction modes.Draw the first brachium pontis AC side output potential, first brachium pontis half-bridge arm output current up and down according to conduction mode.As shown in table 2 below.
The output voltage electric current of rectifier first brachium pontis under the different conduction mode of table 2
| mode | U | i u | i d | Remarks |
| 1 | U dc1 | i in | 0 | Last brachium pontis conducting |
| 2 | 0 | 0 | 0 | Neutral point clamp |
| 3 | -U dc2 | 0 | i in | Following brachium pontis conducting |
Wherein, U is the output potential of brachium pontis input point in respect to mid point o;
i
uWith i
dBe upper and lower half-bridge arm electric current;
U
DcBe intermediate voltage, U
Dc1With U
Dc2Be upper and lower half voltage.
After obtaining above conclusion, can merge modeling, finally can draw the AC side voltage U of rectifier model output first brachium pontis and second brachium pontis (U and V) of rectifier
AcWith DC side upper and lower bridge arm current value i
DcuAnd i
Dcd
U
ac=U
U-U
V
i
dcu=i
uU+i
uV
i
dcd=i
dU+i
dV
Wherein: U
U, U
VBe the output potential of first brachium pontis and second brachium pontis (U and V) input point in respect to mid point o; i
UUWith i
DUBe respectively first brachium pontis (U brachium pontis) upper and lower bridge arm electric current, i
UVWith i
DVBe respectively second brachium pontis (V brachium pontis) upper and lower bridge arm electric current.
When rectifier did not have pwm control signal, as shown in Figure 4, rectifier is in did not control the rectification working condition.Rectifier only VD11～VD42 fly-wheel diode carries out work, so can ignore switching tube and clamping diode carries out equivalence to circuit.Wherein, U
sBe voltage on line side.U
AcBe rectifier AC side voltage, U
DcBe intermediate voltage.R, L are net side equivalent resistance, inductance.i
AcBe rectifier ac-side current, i
DcBe intermediate current.
Because when not controlling rectification work is overall operation, so need to its global analysis inseparable brachium pontis modeling.Brachium pontis conducting situation is as shown in table 3 under condition of different.
The conducting situation of rectifier bridge arm under table 3 different situations
Agreement rectifier cell conducting or will conducting the time, status=1; When rectifier cell by maybe will by the time, status=0.
Conclude the on state characteristic do not control rectification, visible, when no pwm pulse control signal, if single-phase bridge three level rectifiers are also satisfied | U
s|>=U
DcOr ac-side current i
AcOne of two conditions of non-zero just will be in and not control rectification conducting state, i.e. status=1; Otherwise, status=0.
According to i
Ac, U
sAnalyze and do not control single-phase bridge three level rectifier output AC side voltage and DC side current values under the rectification situation, as shown in table 4.
Output voltage current value when table 4 is not controlled rectification
At last; Also need to prove; In this article; Relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint relation or the order that has any this reality between these entities or the operation.And; Term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability; Thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements; But also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Under the situation that do not having much more more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises said key element and also have other identical element.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (13)
1. the modeling method of single-phase bridge three level rectifiers is characterized in that, comprising:
Judge whether the pwm control signal input is arranged in the input side of rectifier;
If have; Then according to the sense of current of input current in the input side of the pattern of the pwm control signal of said rectifier first brachium pontis and second brachium pontis and said rectifier; Draw the conducting situation of said rectifier bridge arm, and summarize according to the conducting situation of said brachium pontis:
The first brachium pontis input point of said rectifier is with respect to the output potential of mid point, the second brachium pontis input point relation with respect to the AC side voltage of the output potential of mid point and the output of said rectifier;
The relation of the last brachium pontis electric current of the last brachium pontis electric current of first brachium pontis of said rectifier, the last brachium pontis electric current of second brachium pontis and said rectifier;
The relation of the following brachium pontis electric current of the following brachium pontis electric current of first brachium pontis of said rectifier, the following brachium pontis electric current of second brachium pontis and said rectifier;
Otherwise the size of the DC side intermediate voltage of the voltage on line side of more said rectifier and said rectifier then draws the conducting situation of diode in the said rectifier, and summarizes according to the conducting situation of diode in the said rectifier:
The relation of the AC side voltage of said rectifier and the DC side intermediate voltage of said rectifier;
The relation of the ac-side current of said rectifier and the intermediate current of said rectifier.
2. method according to claim 1 is characterized in that, the pattern of the pwm control signal of said rectifier is " height is low ", " low height is low ", " low height ", " low height " perhaps " low high ".
3. method according to claim 2 is characterized in that, the sense of current of input current is more than or equal to zero direction or less than zero direction in the input side of said rectifier.
4. method according to claim 3; It is characterized in that the first brachium pontis input point of the said rectifier of said conclusion is specially with respect to the relation of the AC side voltage that the output potential and the said rectifier of mid point are exported with respect to output potential, the second brachium pontis input point of mid point:
According to the sense of current of input current in the input side of different pwm control signal of importing and said rectifier, draw the conducting situation of said rectifier first brachium pontis and second brachium pontis;
According to the conducting situation of said rectifier first brachium pontis and second brachium pontis, the first brachium pontis input point that detects the AC side magnitude of voltage of said rectifier output, said rectifier is with respect to the output potential value of mid point and the second brachium pontis input point output potential value with respect to mid point;
The AC side magnitude of voltage of more detected said rectifier output, the first brachium pontis input point of said rectifier are confirmed the AC side voltage of said rectifier output, said rectifier with respect to the output potential value and the second brachium pontis input point of mid point with respect to the output potential value of mid point the first brachium pontis input point is with respect to the output potential of mid point and the second brachium pontis input point relation with respect to the output potential of mid point.
5. according to the method shown in the claim 4, it is characterized in that the first brachium pontis input point of said rectifier with respect to output potential, the second brachium pontis input point of mid point with respect to the relation of the AC side voltage that the output potential and the said rectifier of mid point are exported is:
U
ac=U
U-U
V；
Wherein, U
AcAC side voltage for rectifier output; U
UThe first brachium pontis input point is with respect to the output potential of mid point; U
VThe first brachium pontis input point is with respect to the output potential of mid point.
6. method according to claim 3 is characterized in that, the relation of last brachium pontis electric current of last brachium pontis electric current and said rectifier of concluding last brachium pontis electric current, second brachium pontis of first brachium pontis of said rectifier is specially:
According to the sense of current of input current in the input side of different pwm control signal of importing and said rectifier, draw the conducting situation of brachium pontis on said rectifier first brachium pontis and second brachium pontis;
According to the conducting situation of brachium pontis on said rectifier first brachium pontis and second brachium pontis, detect the last brachium pontis current value of said rectifier first brachium pontis, the last brachium pontis current value of second brachium pontis and the last brachium pontis current value of said rectifier;
The last brachium pontis current value of the last brachium pontis current value of more detected said rectifier first brachium pontis, the last brachium pontis current value of second brachium pontis and said rectifier is confirmed the relation of last brachium pontis electric current of last brachium pontis electric current and said rectifier of last brachium pontis electric current, second brachium pontis of first brachium pontis of said rectifier.
7. method according to claim 6 is characterized in that, the relation of the last brachium pontis electric current of the last brachium pontis electric current of first brachium pontis of said rectifier, the last brachium pontis electric current of second brachium pontis and said rectifier is:
i
dcu=i
uU+i
uV；
Wherein, i
DcuLast brachium pontis electric current for rectifier; i
UUIt is brachium pontis electric current on first brachium pontis; i
UVIt is brachium pontis electric current on second brachium pontis.
8. method according to claim 3 is characterized in that, the relation of following brachium pontis electric current of following brachium pontis electric current and said rectifier of concluding following brachium pontis electric current, second brachium pontis of first brachium pontis of said rectifier is specially:
According to the sense of current of input current in the input side of different pwm control signal of importing and said rectifier, draw the conducting situation of brachium pontis under said rectifier first brachium pontis and second brachium pontis;
According to the conducting situation of brachium pontis under said rectifier first brachium pontis and second brachium pontis, detect the following brachium pontis current value of said rectifier first brachium pontis, the following brachium pontis current value of second brachium pontis and the following brachium pontis current value of said rectifier;
The following brachium pontis current value of the following brachium pontis current value of more detected said rectifier first brachium pontis, the following brachium pontis current value of second brachium pontis and said rectifier is confirmed the relation of following brachium pontis electric current of following brachium pontis electric current and said rectifier of following brachium pontis electric current, second brachium pontis of first brachium pontis of said rectifier.
9. method according to claim 8 is characterized in that, the relation of the following brachium pontis electric current of the following brachium pontis electric current of first brachium pontis of said rectifier, the following brachium pontis electric current of second brachium pontis and said rectifier is:
i
dcd=i
dU+i
dV；
Wherein, i
DcdFollowing brachium pontis electric current for rectifier; i
DUIt is brachium pontis electric current under first brachium pontis; i
DVIt is brachium pontis electric current under second brachium pontis.
10. method according to claim 1 is characterized in that, the relation of DC side intermediate voltage of concluding AC side voltage and the said rectifier of said rectifier is specially:
Detect and the size of the DC side intermediate voltage value of the voltage on line side value of more said rectifier and said rectifier, draw the conducting situation of diode in the said rectifier; According to the conducting situation of diode in the said rectifier, detect the AC side magnitude of voltage of said rectifier;
The DC side intermediate voltage value of the voltage on line side value of more detected said rectifier, said rectifier and the AC side magnitude of voltage of said rectifier are confirmed the DC side intermediate voltage of the voltage on line side of said rectifier, said rectifier and the AC side voltage relationship of said rectifier.
11. method according to claim 10 is characterized in that, the AC side magnitude of voltage of rectifier confirms that the DC side intermediate voltage of the voltage on line side of said rectifier, said rectifier and the AC side voltage relationship of said rectifier are:
Work as U
s>U
DcThe time, U
Ac=U
Dc
When-U
s>U
DcThe time, U
Ac=-U
Dc
When | U
s|≤U
DcThe time, U
Ac=U
s
Wherein, U
sVoltage on line side for rectifier; U
AcAC side voltage for rectifier; U
DcDC side intermediate voltage for rectifier.
12. method according to claim 1 is characterized in that, the relation of intermediate current of concluding ac-side current and the said rectifier of said rectifier is specially:
Detect and the size of the DC side intermediate voltage value of the voltage on line side value of more said rectifier and said rectifier, draw the conducting situation of diode in the said rectifier;
According to the conducting situation of diode in the said rectifier, detect the ac-side current value of said rectifier and the intermediate current value of said rectifier;
The ac-side current value of more detected said rectifier and the intermediate current value of said rectifier are confirmed the intermediate current relation of the ac-side current and the said rectifier of said rectifier.
13. method according to claim 12 is characterized in that, the ac-side current of said rectifier and the intermediate current of said rectifier relation are:
Work as U
s>U
DcThe time, i
Dc=| i
Ac|;
When-U
s>U
DcThe time, i
Dc=| i
Ac|;
When | U
s|≤U
DcThe time, i
Dc=0;
Wherein, U
sVoltage on line side for rectifier; U
DcDC side intermediate voltage for rectifier; i
AcBe the ac-side current of rectifier, i
DcIntermediate current for rectifier.
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