CN101393465A - Bridge type series, parallel and mixture connection electric energy regulator based on IGBT - Google Patents
Bridge type series, parallel and mixture connection electric energy regulator based on IGBT Download PDFInfo
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- CN101393465A CN101393465A CNA200810201831XA CN200810201831A CN101393465A CN 101393465 A CN101393465 A CN 101393465A CN A200810201831X A CNA200810201831X A CN A200810201831XA CN 200810201831 A CN200810201831 A CN 200810201831A CN 101393465 A CN101393465 A CN 101393465A
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- parallel connection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention relates to an IGBT-based bridge-type serial-parallel compensating power regulator, wherein a digital signal processor DSP performs real-time detection on an input network voltage; when the variation of the amplitude value of the voltage is detected, the DSP controller controls a bridge-type voltage converter to generate a corresponding voltage so as to perform series compensation on the input voltage, thereby the voltage of a distribution network is automatically adjusted and the stability of a load voltage is maintained; and when the wavy distortion of a network current is detected, the DSP controller controls a bridge-type current converter to generate a reverse current so as to perform parallel compensation on the network current, thereby improving the waveform of the network current. Therefore, the IGBT-based bridge-type serial-parallel compensating power regulator not only can inhibit the interference of dropping and rising of the network voltage on power consumers but also can improve the waveform of the current, and actually improves the power quality of a power system in all aspects.
Description
Technical field
The present invention relates to a kind of power control technology, particularly a kind of based on the IGBT bridge type series and mend electric energy regulator.
Background technology
Because the line voltage electricity capacity changes at any time, its voltage fluctuation is very big, shows as frequent overvoltage/undervoltage, instantaneously falls, surge and spike disturb more (especially serious in some remote districts); Another aspect, nonlinear-load rolls up in the electric system, has injected a large amount of harmonic waves and order harmonic components to electrical network, has caused the serious distortion of current waveform, has brought severe contamination to electrical network, thereby influences user's the electricity quality of using.And along with science and technology and expanding economy, the application of infotech and microelectric technique, a large amount of consumers are more and more higher to the requirement of power supply quality.Studies show that electric voltage dropping and harmonic interference problem have become that the many consumers of influence are normal, one of the power quality problem of safe operation.Therefore, how to suppress electric voltage dropping, harmonic wave, become pendulum very urgent problem in face of the electric power researchist the interference of power consumer, the dynamic power quality of raising distribution system.
At present, the AC voltage regulator and the harmonic filter that are used for burning voltage on the market have following several: (1) transformer voltage ratio adjusting type voltage stabilizer: described primary is provided with a plurality of taps, each relay of tap serial connection or bidirectional triode thyristor, come regulation voltage by changing tap, this voltage stabilizer controllable silicon or relay directly are serially connected in the main circuit, load current all from controllable silicon or relay flow through, transition in the load current, fluctuation very easily damages controllable silicon, and produce very big heat by big electric current for a long time, controllable silicon is operated under the abominable operating mode, performance degradation, the reliability variation.(2) carbon brush type AC voltage regulator: the contact of regulating autotransformer by electromechanical mechanism is regulated bucking voltage.Owing to use carbon brush and mechanical drive, cause that its mission life is short, response speed is slow, the carbon brush surface of contact is little and influence that output current, carbon brush quick abrasion need often to change, malfunctioning the causing of machinery rush to summit and burn out voltage stabilizer, power office and change circuit and cause motor to reverse and burn out many shortcomings and problem such as equipment; (3) contactless compensation type ac voltage stabilizer: this topological structure does not have mechanical contact, volume is little, and the efficient height has solved the defective of above-mentioned type, as patent No. ZL00204096.4 and the disclosed contactless AC voltage regulator of patent No. ZL01253876.0; Have level to regulate but these two kinds of its common drawback of the disclosed AC voltage regulator of patent are voltage, can not realize that voltage regulates continuously, the pressure regulation precision is not high.In addition, when switching between the different tappings, easily cause the short circuit accident of thyristor common-mode conducting.(4) active filter: patent No. CN200420076979.2 discloses a kind of high capacity shunt active power filter, but it is the filtering mains by harmonics, and does not deal with for the transition of line voltage; Patent No. CN200710034455.5 just discloses the algorithm of active filter, and its main circuit topology and corresponding circuit structure are not described.
Summary of the invention
It is not high to the present invention is directed in the compensation of present electric energy degree of regulation, and the problem of control poor reliability during transition has proposed a kind of based on the IGBT bridge type series and mend electric energy regulator.When line voltage changes, regulator can be in several millisecond the synchronous alternating voltage of one of generation and line voltage come compensation network electric voltage dropping or rising, thereby load voltage is stabilized in normal value, with the voltage fluctuation that suppresses distribution system influence to customer charge; When waveform distortion of the power supply network serious, when producing a large amount of current harmonicss and jeopardizing user security, regulator can utilize its bridge-type IGBT transducer in parallel, generate one with its current waveform current waveform of phasic difference 180 degree mutually, be superimposed on electrical network, thereby the proof load current waveform is sinusoidal wave, makes its safety, stable operation, avoids harmonic interference.
Technical scheme of the present invention is: a kind of based on the IGBT bridge type series and mend electric energy regulator, comprise parallel connection type IGBT bridge converter, parallel connection type L, C circuit, series compensation transformer, tandem type IGBT bridge converter and control circuit, parallel connection type L, C circuit, it is by transformer (Tr2) additional inductor (L in parallel that connects electrical network
5), nonpolarity building-out capacitor (C then connects
5) the ground connection formation, the output of parallel connection type IGBT bridge converter is connected with electrical network by transformer (Tr2), connect the output of tandem type IGBT bridge converter after being connected on series compensation transformer (Tr1) the step-down isolation on the electrical network, control circuit comprises parallel connection type IGBT bridge converter control circuit and tandem type IGBT bridge converter control circuit, parallel connection type IGBT bridge converter control circuit comprises current detecting, dsp controller, pwm pulse generator and peripheral circuit, the signal of current detecting enters dsp controller and handles conducting and the shutoff of back by the IGBT in the pulse control parallel connection type IGBT bridge converter of control pwm pulse generator generation, by parallel connection type L, the fluctuation of C circuit compensation power network current; Tandem type IGBT bridge converter control circuit comprises voltage detecting, protection telecommunication circuit, dsp controller, pwm pulse generator; the signal of voltage detecting enters dsp controller and handles conducting and the shutoff of back by the IGBT in the pulse control tandem type IGBT bridge converter of control pwm pulse generator generation; by the change of series compensation transformer compensation network voltage, two control circuits carry out exchanges data by dual port RAM.
Leakage inductance (the L of described transformer (Tr2)
7) and electric capacity (C
5) relation between the capacity satisfies relational expression:
N represents overtone order, ω
sBe the electrical network angular frequency, 7 subharmonic of fixing in the filtering electrical network, additional inductor (L
5) and building-out capacitor (C
5) formation 5 subharmonic wave filters.
Described dsp controller adopts the DSP2812 control chip of American TI Company.
Beneficial effect of the present invention is: the present invention is based on the IGBT bridge type series and mends the switching that electric energy regulator does not have mechanical switch, also can not produce electric arc, so its long working life, maintenance capacity is few; Because be the transducer that adopts full control device IGBT to constitute, its response speed is fast, can carry out dynamic electric voltage and regulate; Because this device only needs the part of bucking-out system electric voltage dropping or rising, so its capacity only needs the 1/5-1/3 of power system capacity, the cost performance height; Because its adopts electric current bridge converter that the electrical network waveform is carried out shunt compensation, efficient height, compensation effect are good, can substitute traditional passive and active filter, and can directly apply to high-voltage web system.
Description of drawings
Fig. 1 the present invention is based on the IGBT bridge type series and mends the electric energy regulator system chart;
Fig. 2 the present invention is based on the IGBT bridge type series and mends line voltage drop compensation characteristic synoptic diagram in the electric energy regulator;
Fig. 3 the present invention is based on the IGBT bridge type series and mends line voltage rising compensation characteristic synoptic diagram in the electric energy regulator;
Fig. 4 the present invention is based on the IGBT bridge type series and mends power network current distortion compensation synoptic diagram in the electric energy regulator.
Embodiment
Adopt the EPWM control strategy based on IGBT bridge type series and the system chart of mending electric energy regulator as shown in Figure 1, it is mainly dimerous by main circuit and control circuit.Main circuit is made up of parallel connection type IGBT bridge converter 1, parallel connection type L, C circuit 2, series compensation transformer 3 and tandem type IGBT bridge converter 4, parallel connection type IGBT bridge converter 1, and it is by T
5, T
6, T
7, T
8Four IGBT, equalizing resistance R
3, R
4, energy storage electrochemical capacitor C
3, C
4Constitute, its major function is that electrical network is carried out the dynamic harmonic compensation, because parallel connection type IGBT bridge converter 1 is that (its scale-up factor is k by the transformer Tr2 in parallel connection type L, the C circuit 2
2) be connected with electrical network, so it does not bear harmonic voltage, can be used for the high-voltage fence harmonic filtration; Parallel connection type L, C circuit, (its scale-up factor is k by the transformer Tr2 that connects electrical network for it
2) additional inductor L in parallel
5, nonpolarity building-out capacitor C then connects
5Ground connection constitutes, wherein the leakage inductance L of transformer Tr2
7And capacitor C
5Relation between the capacity should satisfy following relational expression:
N represents overtone order, ω
sBe the electrical network angular frequency, major function is 7 fixing in a filtering electrical network subharmonic, additional inductor L
5, building-out capacitor C
5Constitute 5 subharmonic wave filters, like this transformer Tr2 leakage inductance, additional inductor L
5, building-out capacitor C
5Constitute two passive filters.Hence one can see that, and fundamental reactive current is compelled to flow through additional inductor, and parallel connection type IGBT bridge converter only flows through harmonic current.Because transformer Tr2 leakage inductance, additional inductor L
5, building-out capacitor C
5The passive filter that constitutes is configured to broad tuning, parallel connection type IGBT bridge converter does not bear harmonic voltage, again since additional inductor and passive filter to compare impedance of fundamental frequency little, therefore to bear voltage very low for parallel connection type IGBT bridge converter, so it is very little that its capacity can be done, and that total system voltage can be done is very high.When parallel connection type IGBT bridge converter excess current or fault, by means of fastp-acting fuse, parallel connection type IGBT bridge converter can hightail total system, and all right operate as normal of passive filtering system that zero inclined to one side passive filter and additional inductor are formed is unlikely to electrical network is caused big impact.In addition, parallel connection type IGBT bridge converter can improve the filtering performance of passive filter, improves the antiresonance of entire system and the ability of administering harmonic wave; The 3rd part is that (its scale-up factor is k to series compensation transformer Tr1
2, i.e. voltage u
3=k
1u
4), being connected on the electrical network, its function is step-down and isolation, the voltage that becomes the high voltage variable of electrical network tandem type IGBT bridge converter can bear; The 4th part is a tandem type IGBT bridge converter, and it is by T
1, T
2, T
3, T
4Four IGBT, equalizing resistance R
1, R
2, energy storage electrochemical capacitor C
1, C
2Constitute, its major function is that voltage ripple of power network is compensated and controls, and it is stable in time to keep load voltage, owing to adopt up-to-date IGBT module and driving circuit, it is little to have volume, efficient height, high reliability features, and advanced multiple technology is realized the expansion of complete machine capacity.Control circuit is made up of parallel connection type IGBT bridge converter control circuit 5 and tandem type IGBT bridge converter control circuit 6, wherein parallel connection type IGBT bridge converter control circuit 5, comprise that current detecting, DSP control chip are DSP2812, pwm pulse generator and the peripheral circuits of American TI Company, the pulse that pwm pulse generator produces is used to control T
5, T
6, T
7, T
8The conducting of four IGBT and shutoff.Employing detects harmonic current in real time based on the harmonic current detection technique of instantaneous reactive power theory, by the momentary current tracking Control, realizes the harmonic current dynamic compensation, changes from motion tracking load harmonic current, has high controllability and fast-response; Tandem type IGBT bridge converter control circuit 6 comprises that voltage detecting, protection telecommunication circuit, DSP control chip are the DSP2812 of American TI Company, carries pwm pulse generator, and the pulse of generation is used to control T
1, T
2, T
3, T
4The conducting of four IGBT and shutoff.Characteristics are DSP high speed detection and computing, guarantee voltage detecting and compensation control accurately effectively; Have intelligent monitoring function concurrently, device is controlled flexibly, and operational factor, duty come into plain view automatic fault diagnosis; Possess remote communication interface, can monitor in real time by PC.Two control circuits carry out exchanges data by dual port RAM, coordinate to finish control task mutually, improve the electrical network quality of power supply.
Based on the IGBT bridge type series and to mend the principle of work of electric energy regulator as follows: when voltage ripple of power network, by to electrical network input voltage u
1Detect, obtain reflecting the useful signal u of line voltage
f, with u
fWith reference voltage u
rCompare, obtain error voltage Δ u, then this detection signal is sent into the dsp controller of tandem type IGBT bridge converter,, produced the PWM trigger pulse through the dynamic voltage compensation algorithm, control the shutoff of corresponding IGBT, thereby obtain corresponding voltage, boost through step-up transformer Tr1, electrical network is added to, offset the fluctuation of line voltage, keep the stable of load voltage.Such as working as line voltage u
1During drop Δ u, then the DSP master controller produces corresponding pwm pulse g
1, g
2, g
3, g
4Control T
1, T
2, T
3, T
4Four IGBT conductings or shutoff obtain voltage u
4, boosting by step-up transformer Tr1 obtains voltage u
3, and this moment voltage u
3Amplitude equal electric voltage dropping Δ u, phase place and line voltage u
1Same-phase can get following formula thus and set up:
(u
1-Δu)+u
4＝u
2
(u
1-Δu)+Δu＝u
2
u
1-Δu+Δu＝u
2 (1)
u
1＝u
2
By formula (1) as can be known, as line voltage u
1During drop Δ u, after the compensation of tandem type IGBT bridge converter, its load voltage is still kept stable, makes its interference of avoiding voltage ripple of power network, and its concrete waveform is line voltage drop compensation characteristic synoptic diagram as shown in Figure 2.In like manner as can be known, as line voltage u
1During rising Δ u, then the DSP master controller produces corresponding pwm pulse g
1, g
2, g
3, g
4Control T
1, T
2, T
3, T
4Four IGBT conductings or shutoff obtain voltage u
4, boosting by step-up transformer Tr1 obtains voltage u
3, and this moment voltage u
3Amplitude equal electric voltage dropping Δ u, but phase place and line voltage u
1On the contrary, can get following formula thus sets up:
(u
1+Δu)+u
4＝u
2
(u
1+Δu)-Δu＝u
2
u
1+Δu-Δu＝u
2 (2)
u
1＝u
2
By formula (2) as can be known, as line voltage u
1During rising Δ u, after the compensation of tandem type IGBT bridge converter, its load voltage is still kept stable, also makes its interference of avoiding voltage ripple of power network, and its concrete waveform is line voltage rising compensation characteristic synoptic diagram as shown in Figure 3.And when distortion takes place the power network current waveform, compensate function is just finished by parallel connection type IGBT bridge converter and L, C passive filter, wherein L, the main filtering low-order harmonic of C passive filter, such as 5,7 times, here design by 5 times, then filtering higher hamonic wave of parallel connection type IGBT bridge converter is brought into play its quick compensation characteristic.Its basic functional principle is: at first detect harmonic wave in the system by the current detecting link, according to instantaneous reactive rate algorithm, provide the reference value that needs compensation harmonic, slave controller DSP2812 produces corresponding pulse according to this reference value then, through the pwm pulse circuit, obtain corresponding driving pulse g
5, g
6, g
7, g
8, control main circuit T
5, T
6, T
7, T
8Four IGBT conductings or shutoff produce offset current i
4Follow the tracks of this reference value, play compensation effect.
As shown in Figure 1, according to Kirchhoff's theorem, can get:
i
1＝i
3+i
2
i
4＝k
2*i
3 (3)
Suppose that power network current distorts, and i
1Be expressed as i
b, i
h, i wherein
bThe expression fundametal compoment, i
hThe expression harmonic component.Hence one can see that, make load current i
2Do not contain harmonic component, then i
3Offset current should be-i
h, so just can obtain following formula:
i
1＝i
3+i
2
i
b+i
h＝i
h+i
2
i
2＝i
b
i
4＝k
2*(-i
h) (4)
By formula (4) as can be known, when distortion takes place in power network current, as long as the controller of parallel connection type IGBT bridge converter can detect its harmonic content i accurately
h, and control parallel connection type IGBT bridge converter produces a reverse harmonic wave-i
hSuperpose with power network current, but just the proof load electric current only contains fundametal compoment i
bIts waveform synoptic diagram as shown in Figure 4.
By Fig. 4 power network current distortion compensation synoptic diagram as can be known, after the power network current wave form distortion, after the compensation of parallel connection type IGBT bridge converter, load current waveform is close to sinusoidal, is not subjected to the power network current distortion effects.
And when line voltage fluctuates, when electric current also has distortion, then based on the IGBT bridge type series and mend the collaborative work of electric energy optimizing regulator, each takes charge of its duty, exchanges data exchanges by dual port RAM each other, its concrete principle and waveform synoptic diagram can just repeat no more here with reference to figure 2,3,4.
Claims (2)
1, a kind of based on the IGBT bridge type series and mend electric energy regulator, it is characterized in that comprising parallel connection type IGBT bridge converter, parallel connection type L, C circuit, series compensation transformer, tandem type IGBT bridge converter and control circuit, wherein parallel connection type L, C circuit are by transformer (Tr2) additional inductor (L in parallel that connects electrical network
5), nonpolarity building-out capacitor (C then connects
5) the ground connection formation, the output of parallel connection type IGBT bridge converter is connected with electrical network by transformer (Tr2), connect the output of tandem type IGBT bridge converter after being connected on series compensation transformer (Tr1) the step-down isolation on the electrical network, control circuit comprises parallel connection type IGBT bridge converter control circuit and tandem type IGBT bridge converter control circuit, parallel connection type IGBT bridge converter control circuit comprises current detecting, the DSP slave controller, pwm pulse generator and peripheral circuit, the signal of current detecting enters dsp controller and handles conducting and the shutoff of back by the IGBT in the pulse control parallel connection type IGBT bridge converter of control pwm pulse generator generation, by parallel connection type L, the fluctuation of C circuit compensation power network current; Tandem type IGBT bridge converter control circuit comprises voltage detecting, holding circuit, DSP master controller, pwm pulse generator; the signal of voltage detecting enters the DSP master controller and handles conducting and the shutoff of back by the IGBT in the pulse control tandem type IGBT bridge converter of control pwm pulse generator generation; change by series compensation transformer compensation network voltage; master and slave two control circuits carry out exchanges data by dual port RAM, coordinate mutually the electrical network quality of power supply is optimized adjusting.
2, described based on the IGBT bridge type series and mend electric energy regulator according to claim 1, it is characterized in that the leakage inductance (L of described transformer (Tr2)
7) and electric capacity (C
5) relation between the capacity satisfies relational expression:
N represents overtone order, ω
sBe the electrical network angular frequency, 7 subharmonic of fixing in the filtering electrical network, additional inductor (L
5) and building-out capacitor (C
5) formation 5 subharmonic wave filters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810201831XA CN101393465A (en) | 2008-10-28 | 2008-10-28 | Bridge type series, parallel and mixture connection electric energy regulator based on IGBT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810201831XA CN101393465A (en) | 2008-10-28 | 2008-10-28 | Bridge type series, parallel and mixture connection electric energy regulator based on IGBT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101393465A true CN101393465A (en) | 2009-03-25 |
Family
ID=40493784
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|---|---|---|---|
| CNA200810201831XA Pending CN101393465A (en) | 2008-10-28 | 2008-10-28 | Bridge type series, parallel and mixture connection electric energy regulator based on IGBT |
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|---|---|
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102148567A (en) * | 2010-02-10 | 2011-08-10 | 上海宏力半导体制造有限公司 | Voltage generating circuit |
| CN102495278A (en) * | 2011-11-26 | 2012-06-13 | 河南省电力公司南阳供电公司 | Method for analyzing power harmonic wave and electric energy metering |
| CN102655319A (en) * | 2012-04-26 | 2012-09-05 | 华中科技大学 | Direct-current circuit breaker capable of reducing forward superimposed current |
| CN102738797A (en) * | 2012-05-31 | 2012-10-17 | 江苏盈方智能科技有限公司 | Double-DSP (Digital Signal Processor) circuit for intelligent filtering device |
| CN104333006A (en) * | 2014-11-06 | 2015-02-04 | 上海电力学院 | Dynamic voltage two-way stepless regulating transformer |
| CN105468080A (en) * | 2016-01-11 | 2016-04-06 | 林志贤 | Voltage stabilizing system for electric transmission and transformation equipment |
| CN105762799A (en) * | 2014-12-17 | 2016-07-13 | 利思电气（上海）有限公司 | Embedded type active inversion unit |
| CN107196309A (en) * | 2017-07-26 | 2017-09-22 | 长沙理工大学 | Rotation formula Cascade H bridge type dynamic electric voltage recovers and active filter circuit and method |
| CN110391661A (en) * | 2019-06-18 | 2019-10-29 | 太原理工大学 | Series compensation transformer DC magnetic bias suppressing method between micro-capacitance sensor and power distribution network |
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| CN117895521A (en) * | 2024-03-18 | 2024-04-16 | 山东华天电气有限公司 | Power distribution network control system and method based on AVC circuit mixed regulation |
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| CN102148567A (en) * | 2010-02-10 | 2011-08-10 | 上海宏力半导体制造有限公司 | Voltage generating circuit |
| CN102148567B (en) * | 2010-02-10 | 2015-07-08 | 上海华虹宏力半导体制造有限公司 | Voltage generating circuit |
| CN102495278A (en) * | 2011-11-26 | 2012-06-13 | 河南省电力公司南阳供电公司 | Method for analyzing power harmonic wave and electric energy metering |
| CN102655319A (en) * | 2012-04-26 | 2012-09-05 | 华中科技大学 | Direct-current circuit breaker capable of reducing forward superimposed current |
| CN102655319B (en) * | 2012-04-26 | 2014-11-12 | 华中科技大学 | Direct-current circuit breaker capable of reducing forward superimposed current |
| CN102738797A (en) * | 2012-05-31 | 2012-10-17 | 江苏盈方智能科技有限公司 | Double-DSP (Digital Signal Processor) circuit for intelligent filtering device |
| CN104333006A (en) * | 2014-11-06 | 2015-02-04 | 上海电力学院 | Dynamic voltage two-way stepless regulating transformer |
| CN105762799A (en) * | 2014-12-17 | 2016-07-13 | 利思电气（上海）有限公司 | Embedded type active inversion unit |
| CN105468080A (en) * | 2016-01-11 | 2016-04-06 | 林志贤 | Voltage stabilizing system for electric transmission and transformation equipment |
| CN105468080B (en) * | 2016-01-11 | 2017-05-31 | 王建标 | A kind of power transmission and transforming equipment voltage-stabilizing system |
| US10826379B2 (en) | 2016-11-22 | 2020-11-03 | Siemens Aktiengesellschaft | Converter arrangement comprising a star point reactor |
| EP3526889B1 (en) * | 2016-11-22 | 2022-08-31 | Siemens Energy Global GmbH & Co. KG | Inverter assembly with a grounding transformer |
| CN107196309A (en) * | 2017-07-26 | 2017-09-22 | 长沙理工大学 | Rotation formula Cascade H bridge type dynamic electric voltage recovers and active filter circuit and method |
| CN107196309B (en) * | 2017-07-26 | 2023-04-07 | 长沙理工大学 | Alternate cascade H-bridge type dynamic voltage recovery and active filter circuit and method |
| CN110391661A (en) * | 2019-06-18 | 2019-10-29 | 太原理工大学 | Series compensation transformer DC magnetic bias suppressing method between micro-capacitance sensor and power distribution network |
| CN110391661B (en) * | 2019-06-18 | 2023-04-21 | 太原理工大学 | DC magnetic bias suppression method for series compensation transformer between micro-grid and power distribution network |
| CN117895521A (en) * | 2024-03-18 | 2024-04-16 | 山东华天电气有限公司 | Power distribution network control system and method based on AVC circuit mixed regulation |
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Application publication date: 20090325 |