CN102315779A - Serial power quality compensator based on alternating current (AC)/AC chopper - Google Patents
Serial power quality compensator based on alternating current (AC)/AC chopper Download PDFInfo
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- CN102315779A CN102315779A CN2010102222179A CN201010222217A CN102315779A CN 102315779 A CN102315779 A CN 102315779A CN 2010102222179 A CN2010102222179 A CN 2010102222179A CN 201010222217 A CN201010222217 A CN 201010222217A CN 102315779 A CN102315779 A CN 102315779A
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- voltage
- output
- brachium pontis
- bidirectional switch
- chopper
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Abstract
The invention discloses a serial power quality compensator based on an alternating current (AC)/AC chopper. The serial power quality compensator consists of an AC/AC chopper circuit, a compensation transformer and an output filter circuit. The serial power quality compensator has the advantages of: having no reactor of an induction regulating compensator, and reducing the whole volume weight when the compensation transformer works in the state of high-frequency modulation; carrying out stepless smooth regulation on an output voltage so as to have quick dynamic response; carrying out control on an instantaneous value of the output voltage, having high sinusoidal quality of the wave form of the output voltage, and playing a role in inhibiting voltage flickering of an outside power grid, harmonic wave and the like; and being simple in circuit structure and easy in implementation, and having less used devices in the AC/AC circuit and less circuit overhead.
Description
One, technical field
The present invention relates to a kind of serially connected electrical energy quality compensator, belong to the AC voltage regulator in the transformation of electrical energy device based on the AC/AC chopper.
Two, background technology
The extraneous voltage ripple of power network of China is bigger; Exist various interference, particularly in recent years along with development and national economy, the need for electricity amount rises rapidly; Popularizing gradually of non-linear equipments such as power electronic equipment produced serious harmonic pollution to electrical network; Have a strong impact on the operate as normal of instrument and equipment and household electrical appliance, therefore, AC voltage regulator just becomes the requisite power supply unit of many visual plants.The AC voltage regulator kind of practical application at present is a lot; Comprise saturation core regulator, parametric type pressurizer and compensated voltage regulator; Wherein the compensated voltage regulator use is the most extensive, can be divided into again: contact type voltage regulator and controllable silicon or relay are transferred the compensation type ac voltage stabilizer of sense etc.Wherein big, the Heavy Weight of saturation core regulator volume, efficient are low.The parametric type pressurizer can cause the fluctuation that output voltage is big in start-up course, and its fluctuation voltage can reach the twice output voltage; Because the existence of inductance when the load that is switched on or switched off same AC voltage regulator, can seriously be disturbed other equipment.The secondary voltage that contact type voltage regulator uses servomotor to change voltage regulator changes bucking voltage, and reaction speed is slow, and subject matter is that the machine driven system noise is big, easy to wear, volume is big, cost is high, maintenance difficult because the contact is arranged.Thyristor or relay transfer the compensation type ac voltage stabilizer of sense on the precision of voltage regulation and efficient, than saturation core regulator large increase to be arranged, but still adopt Heavy Weight and bulky reactor to decide and recall to the road; Adopt relay to transfer the compensation type ac voltage stabilizer of sense still to have mechanical contact to exist, and adopt thyristor to transfer the AC voltage regulator of sense in adjustment process, to be easy to generate the conducting of thyristor common-mode, thyristor is damaged; And the output voltage of the AC voltage regulator of this induction-regulated is regulated for the utmost point is arranged, and output voltage is unsmooth, only can regulate effective value, and the input voltage waveform distortion is not regulated or the inhibition ability, can not regulate the sinusoidal degree of output voltage.In a word, the various AC voltage regulators of using at present all exist obvious defects, particularly can not eliminate various electromagnetic distus effectively, and this becomes the key subjects that China power technology worker faces.
Three, summary of the invention
1, goal of the invention: the purpose of this invention is to provide a kind of contactless electrical energy quality compensator that can realize that the output voltage quick and smooth is regulated and had the waveform adjustment ability.
2, technical scheme: in order to solve above-mentioned technical problem, the serially connected electrical energy quality compensator based on the AC/AC chopper of the present invention comprises AC/AC chopper circuit 1, compensator transformer 2 and filter circuit 3; AC/AC chopper circuit 1 comprises the first bidirectional switch Q
1, the second bidirectional switch Q
2, the 3rd bidirectional switch Q
3, the 4th bidirectional switch Q
4, brachium pontis output filter capacitor C
cFilter circuit 3 comprises output inductor L
f, output filter capacitor C
fThe extraneous line voltage u of the input termination of AC/AC chopper circuit 1
i, the former limit of the output termination compensator transformer 2 of AC/AC chopper circuit 1, the secondary of compensator transformer 2 is connected on extraneous line voltage u
iOutput and filter circuit 3 between, the output of filter circuit 3 meets extraneous load Z.Serially connected electrical energy quality compensator based on the AC/AC chopper of the present invention is characterised in that, in the AC/AC chopper circuit 1, and the first bidirectional switch Q
1An end and the second bidirectional switch Q
2An end be connected in the first brachium pontis mid point A, constitute first brachium pontis, the 3rd bidirectional switch Q
3An end and the 4th bidirectional switch Q
4An end be connected in the second brachium pontis mid point B, constitute second brachium pontis; The first bidirectional switch Q
1The other end and the 3rd bidirectional switch Q
3The other end be connected to extraneous line voltage u
iOutput, the second bidirectional switch Q
2The other end and the 4th bidirectional switch Q
4The other end be connected to extraneous line voltage negative pole promptly " ", brachium pontis output filter capacitor C
cAn end link the first brachium pontis mid point A, brachium pontis output filter capacitor C
cThe other end link the second brachium pontis mid point B; The former limit first end (p of compensator transformer 2
1) and the secondary first end s of compensator transformer 2
1Be end of the same name, the former limit second end p of compensator transformer 2
2The secondary second end s with compensator transformer 2
2Be end of the same name; The former limit first end p of compensator transformer 2
1Link the first brachium pontis mid point A, the former limit second end p of compensator transformer 2
2Link the second brachium pontis mid point B, the secondary second end s of compensator transformer 2
2Link extraneous line voltage u
iOutput, the secondary first end s of compensator transformer 2
1Link output inductor L
fAn end; Output inductor L
fThe other end and output filter capacitor C
fAn end link to each other, constitute output filter circuit 3, output inductor L
fWith output filter capacitor C
fTie point connect the end of extraneous load Z, output filter capacitor C
fThe other end of the other end and extraneous load Z connect simultaneously " ".
3, beneficial effect: the present invention has following advantage: adopt and hand over the AC/AC chopper circuit of Direct Transform to accomplish voltage compensation, can accomplish required function fully and simplify circuit again.If adopt traditional AC/DC to add the two-stage circuit structure construction compensating unit of DC/AC, two-stage circuit all needs the energy that can two-way circulate, and needs to control respectively and judge; Need Total tune control again; Need DC bus-bar voltage is carried out voltage stabilizing, all very complicated in circuit structure and the control, expense is big; Through selection, can select just to compensate still negative compensation easily to AC/AC chopper work brachium pontis.And this implements very complicacy when using the two-stage type structure; Regulate bucking voltage according to input voltage instantaneous value computed duty cycle; This method makes that the instantaneous value of output voltage also can be controlled; Compensator can both compensate and suppress the flickering of input voltage, distortion etc.; This when compensating unit adopts the two-stage type structure, also can accomplish but implementation algorithm is complicated, and the effective value that conventional AC pressurizers such as induction-regulated pressurizer can only control output voltage; The present invention adopts electronic switch fully, does not have mechanical double-throw contact; Adopt AC/AC translation circuit circuit by way of compensation, use device few, do not have the reactor of induction-regulated compensator, and compensator transformer work high frequency modulated state, these all greatly reduce whole volume weight; Circuit structure and control algolithm are all fairly simple, are easy to realize; Output voltage is carried out electrodeless smooth adjustment, and dynamic response is fast; Instantaneous value to output voltage is controlled, and the output voltage waveforms sine is of high quality, and line voltage flickering to external world, harmonic wave etc. are inhibited.
4, description of drawings
Accompanying drawing 1 is based on the serially connected electrical energy quality compensator electrical block diagram of AC/AC chopper.
Accompanying drawing 2 is bidirectional switch actual configuration figure.
Accompanying drawing 3 is switch mode I sketch mapes.
Accompanying drawing 4 is switch mode II sketch mapes.
Accompanying drawing 5 is switch mode III sketch mapes.
Accompanying drawing 6 is switch mode IV sketch mapes.
Accompanying drawing 7 is based on the control block diagram of the serially connected electrical energy quality compensator employing of AC/AC chopper.
In the accompanying drawing, the 1st, AC/AC chopper circuit, the 2nd, compensator transformer, the 3rd, filter circuit; A is the first brachium pontis mid point, i.e. the first bidirectional switch Q
1With the second two-way Q
2Tie point; B is the second brachium pontis mid point, i.e. the 3rd bidirectional switch Q
3With the 4th bidirectional switch Q
4Tie point; C
cIt is the brachium pontis output filter capacitor; C
fIt is output filter capacitor; i
oIt is output current; L
fIt is output inductor; p
1～p
2Be two ends, the former limit of compensator transformer; Q
1～Q
4It is first～the 4th bidirectional switch; s
1～s
2Be compensator transformer secondary two ends; u
ABBe bridge arm voltage, i.e. voltage between the first brachium pontis mid point A and the second brachium pontis mid point B; u
cBe bucking voltage, i.e. compensator transformer 2 secondary voltages, the former secondary turn ratio of compensator transformer 2 is n, u
c=u
AB/ n; u
iBe the compensator transformer input voltage, promptly extraneous line voltage; u
oIt is the output voltage of the serially connected electrical energy quality compensator based on the AC/AC chopper of the present invention; u
rIt is the voltage reference of AC/AC chopper circuit; u
sBe that compensator transformer 2 output voltages are inductance before the filtering, u
s=u
i-u
cu
SinBe output voltage benchmark, i.e. desired voltage; u
ZIt is the pressure drop on the line impedance; Z is extraneous load.
Four, embodiment
Shown in accompanying drawing 1, its structure is the extraneous line voltage u of the input termination of AC/AC chopper circuit 1
i, the former limit of the output termination compensator transformer 2 of AC/AC chopper circuit 1, the secondary of compensator transformer 2 is connected on extraneous line voltage u
iOutput and filter circuit 3 between, the output of filter circuit 3 meets extraneous load Z; In the AC/AC chopper circuit 1, the first bidirectional switch Q
1An end and the second bidirectional switch Q
2An end be connected in the first brachium pontis mid point A, constitute first brachium pontis, the 3rd bidirectional switch Q
3An end and the 4th bidirectional switch Q
4An end be connected in the second brachium pontis mid point B, constitute second brachium pontis; The first bidirectional switch Q
1The other end and the 3rd bidirectional switch Q
3The other end be connected to extraneous line voltage u
iOutput, the second bidirectional switch Q
2The other end and the 4th bidirectional switch Q
4The other end be connected to extraneous line voltage negative pole promptly " ", brachium pontis output filter capacitor C
cAn end link the first brachium pontis mid point A, brachium pontis output filter capacitor C
cThe other end link the second brachium pontis mid point B; The former limit first end (p of compensator transformer 2
1) and the secondary first end s of compensator transformer 2
1Be end of the same name, the former limit second end p of compensator transformer 2
2The secondary second end s with compensator transformer 2
2Be end of the same name; The former limit first end p of compensator transformer 2
1Link the first brachium pontis mid point A, the former limit second end p of compensator transformer 2
2Link the second brachium pontis mid point B, the secondary second end s of compensator transformer 2
2Link extraneous line voltage u
iOutput, the secondary first end s of compensator transformer 2
1Link output inductor L
fAn end; Output inductor L
fThe other end and output filter capacitor C
fAn end link to each other, constitute output filter circuit 3, output inductor L
fWith output filter capacitor C
fTie point connect the end of extraneous load Z, output filter capacitor C
fThe other end of the other end and extraneous load Z connect simultaneously " ".
Shown in accompanying drawing 2, its structure is first～the 4th bidirectional switch Q
1～Q
4Concrete structure, be to constitute through the negative electrode of two MOS type devices is linked to each other, the anode of two MOS type devices is as the two ends of bidirectional switch.
The operation principle of the serially connected electrical energy quality compensator based on the AC/AC chopper of the present invention is: during work, because compensator transformer is connected between input and the load, the output voltage of this compensator is extraneous line voltage u
iDeduct bucking voltage u
cObtain through filtering, the AC/AC chopper works in the PWM modulation system, and the high frequency voltage modulating wave of generation is bucking voltage u
cWith extraneous Voltage Harmonic content equal and opposite in direction, in the opposite direction, be equivalent to a controlled voltage source, bucking voltage u during compensator transformer work
cCancel out each other with extraneous Voltage Harmonic, reach the purpose of compensation harmonic voltage, after filtering, obtain amplitude stability, output voltage that sinusoidal degree is very high.The AC/AC chopper adopts full-bridge topologies, produces bucking voltage, and the AC/AC chopper adopts bidirectional switch, but four quadrant running is realized the energy two-way flow; Work as Q
4Remain closed Q
3Keep breaking off, during the first brachium pontis modulation work, AC/AC chopper output voltage polarity is identical with input voltage polarity, works as Q
2Keep conducting, Q
1Keep breaking off; When second brachium pontis) modulating work; AC/AC chopper output voltage polarity is opposite with input voltage polarity, thus both to external world line voltage bear compensation, when extraneous line voltage is higher than desired voltage, it is deducted a difference; Also line voltage just compensates to external world, when extraneous line voltage is lower than desired voltage, it is added an increment.The size of AC/AC chopper output voltage is regulated through PWM, and the output of AC/AC chopper is with being entered as ratio, and proportionality coefficient is a duty ratio.The instantaneous value of input voltage and the difference (being the input voltage harmonic content) of required ideal sine wave (being the output voltage benchmark) are come computed duty cycle as full-bridge AC/AC chopper voltage reference; The full-bridge AC/AC chopper output voltage that obtains is promptly followed the tracks of the input voltage harmonic content fully, and the output voltage of then extraneous line voltage and full-bridge AC/AC chopper is done the compensator output voltage that obtains after the difference will be equal fully with desirable sine wave.In fact consider also some very little pressure drop on line impedance and the filter inductance, the output current computational scheme pressure drop of can sampling necessarily compensates full-bridge AC/AC chopper voltage reference.
Be main circuit structure with accompanying drawing 1 below, narrate the concrete operation mode of the serially connected electrical energy quality compensator based on the AC/AC chopper of the present invention in conjunction with accompanying drawing 3～accompanying drawing 6.Serially connected electrical energy quality compensator based on the AC/AC chopper of the present invention comprises four switch mode shown in accompanying drawing 3～accompanying drawing 6.
During greater than desired voltage, need bear compensation at line voltage to reduce the line voltage of input.First brachium pontis conditioning work this moment.Second brachium pontis is not worked, the 3rd switch S
3Remain closed the 4th switch S
4Keep breaking off.This moment, circuit mainly comprised two operation modes:
Switch mode I shown in accompanying drawing 3, the first bidirectional switch Q
1Open-minded, the second bidirectional switch Q
2Turn-off, the brachium pontis output voltage is extraneous line voltage: u
AB=u
i, the former secondary turn ratio of compensator transformer 2 is n, its secondary output is bucking voltage u
c=u
AB/ n, compensator transformer output voltage are u
s=u
i-u
c＜u
i
Switch mode II shown in accompanying drawing 4, the first bidirectional switch Q
1Turn-off the second bidirectional switch Q
2Open-minded, the brachium pontis output voltage is zero potential: u
AB=0, the secondary output of compensator transformer 2 is bucking voltage u
c=0, the compensator transformer output voltage is u
s=u
i-u
c=u
i
After filter circuit 3 filtering, output voltage u
oBe approximately equal to desired voltage.
During less than desired voltage, need just compensate line voltage at extraneous line voltage with the input that raises.This moment, first brachium pontis was not worked the second brachium pontis conditioning work, the first bidirectional switch S
1Remain closed the second bidirectional switch S
2Keep breaking off.This moment, circuit mainly comprised two operation modes:
Switch mode III shown in accompanying drawing 5, the 3rd bidirectional switch Q
3Open-minded, the 4th bidirectional switch Q
4Turn-off, the brachium pontis output voltage is negative extraneous line voltage: u
AB=-u
i, the secondary output of compensator transformer 2 is bucking voltage u
c=-u
AB/ n, compensator transformer device output voltage is u
s=u
i-u
c＞u
i
Shown in accompanying drawing 6, the 3rd bidirectional switch Q
3Turn-off the 4th bidirectional switch Q
4Open-minded, the brachium pontis output voltage is zero potential: u
AB=0, the secondary output of compensator transformer 2 is bucking voltage u
c=0, the compensator transformer output voltage is u
s=u
i-u
c=u
i
After filter circuit 3 filtering, output voltage u
oBe approximately equal to desired voltage.
For realizing above-mentioned operation principle, the control block diagram that adopts based on the serially connected electrical energy quality compensator of AC/AC chopper is shown in accompanying drawing 7, and its structure is the extraneous line voltage u of sampling
i, behind phase-locked loop, obtain the output voltage benchmark u synchronous with extraneous line voltage
Sin, sampling output current i
oObtain line drop u after multiply by line impedance
ZExtraneous line voltage u
iDeduct output voltage benchmark u
Sin, add line drop u
ZAfter obtain AC/AC chopper voltage reference u
rAccording to AC/AC chopper voltage reference u
rWith extraneous line voltage u
iObtain current required duty ratio d through computing.According to AC/AC chopper voltage reference u
rPolarity duty ratio d carried out logical operation obtain bidirectional switch Q
1～Q
4Driving d
1～d
4, control bidirectional switch Q
1～Q
4Switch, to bucking voltage u
cRegulate and then regulate output voltage.Above control strategy has well been realized the adjusting to output voltage amplitude and waveform.
Claims (1)
1. the serially connected electrical energy quality compensator based on the AC/AC chopper comprises AC/AC chopper circuit (1), compensator transformer (2) and filter circuit (3), it is characterized in that, and in the AC/AC chopper circuit (1), the first bidirectional switch (Q
1) an end and the second bidirectional switch (Q
2) an end be connected in the first brachium pontis mid point (A), constitute first brachium pontis, the 3rd bidirectional switch (Q
3) an end and the 4th bidirectional switch (Q
4) an end be connected in the second brachium pontis mid point (B), constitute second brachium pontis; First bidirectional switch (the Q
1) the other end and the 3rd bidirectional switch (Q
3) the other end be connected to extraneous line voltage (u
i) output, the second bidirectional switch (Q
2) the other end and the 4th bidirectional switch (Q
4) the other end be connected to extraneous line voltage negative pole promptly " ", brachium pontis output filter capacitor (C
c) an end link the first brachium pontis mid point (A), brachium pontis output filter capacitor (C
c) the other end link the second brachium pontis mid point (B); The former limit first end (p of compensator transformer (2)
1) and the secondary first end (s of compensator transformer (2)
1) be end of the same name, the former limit second end (p of compensator transformer (2)
2) and the secondary second end (s of compensator transformer (2)
2) be end of the same name; The former limit first end (p of compensator transformer (2)
1) link the first brachium pontis mid point (A), the former limit second end (p of compensator transformer (2)
2) link the second brachium pontis mid point (B), the secondary second end (s of compensator transformer (2)
2) link extraneous line voltage (u
i) output, the secondary first end (s of compensator transformer (2)
1) link output inductor (L
f) an end; Output inductor (L
f) the other end and output filter capacitor (C
f) an end link to each other, constitute output filter circuit (3), output inductor (L
f) and output filter capacitor (C
f) tie point connect an end of extraneous load (Z), output filter capacitor (C
f) the other end of the other end and extraneous load (Z) connect simultaneously " ".
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102222179A CN102315779A (en) | 2010-07-09 | 2010-07-09 | Serial power quality compensator based on alternating current (AC)/AC chopper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102222179A CN102315779A (en) | 2010-07-09 | 2010-07-09 | Serial power quality compensator based on alternating current (AC)/AC chopper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102315779A true CN102315779A (en) | 2012-01-11 |
Family
ID=45428655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102222179A Pending CN102315779A (en) | 2010-07-09 | 2010-07-09 | Serial power quality compensator based on alternating current (AC)/AC chopper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102315779A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104235A (en) * | 2014-07-15 | 2014-10-15 | 龚秋声 | Single-phase and three-phase symmetric chopped wave high-variable-compensation alternating-current voltage stabilizer |
| CN104767390A (en) * | 2015-04-06 | 2015-07-08 | 龚秋声 | Bridge type alternating current chopping wave bidirectional voltage regulator circuit |
| CN104796005A (en) * | 2015-04-06 | 2015-07-22 | 龚秋声 | Alternating current/alternating current bridge type chopping bidirectional voltage-regulating circuit |
| CN104821730A (en) * | 2015-05-22 | 2015-08-05 | 龚秋声 | Single-phase and three-phase full-bridge AC chopper high-frequency compensation AC stabilized power supply |
| CN104836450A (en) * | 2015-05-18 | 2015-08-12 | 龚秋声 | Single-phase and three-phase full-bridge AC-chopper power frequency conversion compensation AC stabilized-voltage power supply |
| CN109713910A (en) * | 2019-01-16 | 2019-05-03 | 浙江省检验检疫科学技术研究院 | Only handle the alternating current steady voltage plug of Partial Power |
| CN104836450B (en) * | 2015-05-18 | 2019-07-16 | 龚秋声 | Single-phase and three phase full bridge AC chopping work becomes compensation alternating current steady voltage plug |
| CN110380631A (en) * | 2019-05-14 | 2019-10-25 | 浙江省检验检疫科学技术研究院 | High power density DC power supply |
| CN112491263A (en) * | 2020-11-20 | 2021-03-12 | 南昌黑鲨科技有限公司 | Stepless regulation power supply circuit and method and charging equipment with power supply circuit |
| CN112994018A (en) * | 2021-03-22 | 2021-06-18 | 东北电力大学 | Transformer-free unified power flow controller based on chopping control impedor |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104235A (en) * | 2014-07-15 | 2014-10-15 | 龚秋声 | Single-phase and three-phase symmetric chopped wave high-variable-compensation alternating-current voltage stabilizer |
| CN104104235B (en) * | 2014-07-15 | 2017-09-01 | 龚秋声 | Single-phase and three-phase symmetrical copped wave height becomes compensation AC voltage regulator |
| CN104767390A (en) * | 2015-04-06 | 2015-07-08 | 龚秋声 | Bridge type alternating current chopping wave bidirectional voltage regulator circuit |
| CN104796005A (en) * | 2015-04-06 | 2015-07-22 | 龚秋声 | Alternating current/alternating current bridge type chopping bidirectional voltage-regulating circuit |
| CN104796005B (en) * | 2015-04-06 | 2019-02-05 | 龚秋声 | Hand over bridge-type copped wave bidirectional pressure regulating circuit |
| CN104836450B (en) * | 2015-05-18 | 2019-07-16 | 龚秋声 | Single-phase and three phase full bridge AC chopping work becomes compensation alternating current steady voltage plug |
| CN104836450A (en) * | 2015-05-18 | 2015-08-12 | 龚秋声 | Single-phase and three-phase full-bridge AC-chopper power frequency conversion compensation AC stabilized-voltage power supply |
| CN104821730A (en) * | 2015-05-22 | 2015-08-05 | 龚秋声 | Single-phase and three-phase full-bridge AC chopper high-frequency compensation AC stabilized power supply |
| CN109713910A (en) * | 2019-01-16 | 2019-05-03 | 浙江省检验检疫科学技术研究院 | Only handle the alternating current steady voltage plug of Partial Power |
| CN110380631A (en) * | 2019-05-14 | 2019-10-25 | 浙江省检验检疫科学技术研究院 | High power density DC power supply |
| CN112491263A (en) * | 2020-11-20 | 2021-03-12 | 南昌黑鲨科技有限公司 | Stepless regulation power supply circuit and method and charging equipment with power supply circuit |
| CN112994018A (en) * | 2021-03-22 | 2021-06-18 | 东北电力大学 | Transformer-free unified power flow controller based on chopping control impedor |
| CN112994018B (en) * | 2021-03-22 | 2023-02-28 | 东北电力大学 | Transformer-free unified power flow controller based on chopping control impedor |
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Application publication date: 20120111 |