CN101291057A - Dynamic voltage compensator adopting 3 phase structure - Google Patents
Dynamic voltage compensator adopting 3 phase structure Download PDFInfo
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- CN101291057A CN101291057A CNA2007100397656A CN200710039765A CN101291057A CN 101291057 A CN101291057 A CN 101291057A CN A2007100397656 A CNA2007100397656 A CN A2007100397656A CN 200710039765 A CN200710039765 A CN 200710039765A CN 101291057 A CN101291057 A CN 101291057A
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Abstract
The invention relates to a dynamic voltage compensator adopting a three-single phase structure, wherein three-phase alternating voltage of electric grid is inputted to a rectification module; the rectification module adopts a PWM control three single phase full bridge circuit with rectification controlling unit output; the direct current voltage of the rectification module is inputted to a direct current energy storage module formed by direct current capacitances; the direct current of the direct current energy storage module is inputted to an inversion module; the inversion module adopts the PWM control three single phase full bridge circuit with inversion controlling unit output; the inversion module is inputted to a filtering synchronization module; the filtering synchronization module formed by an LC circuit is directly connected with the electric grid in series by capacitances; a detection module is inputted with voltage-current analog quantity signals of a system, and the output of the detection module, which is used as a reference wave component, is sent to the inverter controlling unit. The dynamic voltage compensator has the advantages that the compensator thoroughly resolves the problem of unbalanced compensation of three phase voltage, and three phases can also independently work and other two phases can continue to work normally even if one phase is out of work.
Description
Technical field
The present invention relates to a kind of dynamic voltage compensator, relate in particular to a kind of dynamic voltage compensator that adopts 3 phase structure.
Background technology
(Dynamic Voltage Restorer is a kind of voltage source type electric power electronic compensation device DVR) to dynamic voltage compensator, is serially connected with between power supply and the important load.It has good dynamic property, when voltage dip or projection take place, can in the very short time (several millisecond) fault place voltage be returned to normal value.DVR is made of energy storage device, inverter, filter, series transformer usually, and its control circuit is many to be made up of single-chip microcomputer.
As seen from Figure 1: rectification module is realized that by rectified three-phase circuit its dc voltage is uncontrollable, is difficult to guarantee the stable of when electric voltage dropping dc voltage; The dc energy storage module is realized by condenser network; Inversion module adopts the three phase full bridge inverter circuit to realize, exists bucking voltage accurate inadequately when compensating three-phase unbalance falls, and can't export zero sequence voltage component, shortcomings such as control complexity; Device inserts electrical network by the filtering module that is incorporated into the power networks, because transformer self produces phase shift and decay, has brought difficult design to voltage compensation, has reduced the response speed and the compensation effect of system.Form by voltage, current sensor on the detection module hardware, be used for obtaining the analog signal amount that algorithm needs.Because China's electrical network adopts the three-phase four-wire system structure more, the three-phase imbalance situation is more, so traditional DVR structure is difficult to satisfy the compensation requirement.
Summary of the invention
The technical issues that need to address of the present invention have provided a kind of dynamic voltage compensator that adopts 3 phase structure, are intended to solve above-mentioned defective.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
The present invention includes: the three-phase alternating voltage of electrical network is input to rectification module; Described rectification module is to adopt the PWM of rectification controlling unit output to control three single-phase full bridge circuit; The direct voltage of rectification module outputs to the dc energy storage module that is made of dc capacitor; Dc energy storage module direct current outputs to inversion module; Described inversion module is to adopt the PWM of inversion control link output to control three single-phase full bridge circuit; Inversion module outputs to the filtering module that is incorporated into the power networks; The described filtering module that is incorporated into the power networks is made of lc circuit, directly seals in electrical network by electric capacity; Detection algorithm is handled the electric current and voltage analog signals of input in the detection module, and the inverter controlling unit is sent in the output that obtains required reference wave component;
Compared with prior art, the invention has the beneficial effects as follows: the compensation problem that has thoroughly solved imbalance of three-phase voltage; Simultaneously also can carry out each single-phase working alone, in a certain operate as normal that does not influence other two-phase when losing efficacy mutually.
Description of drawings
Fig. 1 is a three phase full bridge DVR module map in the prior art;
Fig. 2 is a module map of the present invention;
Fig. 3 is the module map of a certain phase among Fig. 2;
Fig. 4 is rectification control principle figure of the present invention;
Fig. 5 is an inversion control schematic diagram of the present invention;
Fig. 6 is a detection algorithm theory diagram in the detection module;
Fig. 7 is a program flow diagram of the present invention
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:
By Fig. 2, Fig. 3 as seen: the present invention includes: the three-phase alternating voltage of electrical network is input to rectification module; Described rectification module is PWM (pulse modulation technology) the control three single-phase full bridge circuit that adopt the output of rectification controlling unit; The direct voltage of rectification module outputs to the dc energy storage module that is made of dc capacitor; Dc energy storage module direct current outputs to inversion module; Described inversion module is to adopt the PWM of inversion control link output to control three single-phase full bridge circuit; Inversion module outputs to the filtering module that is incorporated into the power networks; The described filtering module that is incorporated into the power networks is made of lc circuit, directly seals in electrical network by electric capacity; Detection module is input as the electric current and voltage analog signals of system, sends into the inverter controlling unit as the output of reference wave component;
PWM (pulse modulation technology) the control three single-phase full bridge circuit of described rectification controlling unit output comprise: A phase, control impuls are controlled the 11 switching tube 11 respectively, twelvemo is closed pipe the 12, the 13 switching tube the 13, the 14 switching tube 14; It is same brachium pontis that the 11 switching tube 11, twelvemo are closed pipe 12, and the 13 switching tube the 13, the 14 switching tube 14 is same brachium pontis; B phase, control impuls are controlled the 21 switching tube 21 respectively, second twelvemo is closed pipe the 22, the 23 switching tube the 23, the 24 switching tube 24; It is same brachium pontis that the 21 switching tube 21, second twelvemo are closed pipe 22, and the 23 switching tube the 23, the 24 switching tube 24 is same brachium pontis; C phase, control impuls are controlled the 31 switching tube 31 respectively, thirty-twomo closes pipe the 32, the 33 switching tube the 33, the 34 switching tube 34; It is same brachium pontis that the 31 switching tube 31, thirty-twomo close pipe 32; The 33 switching tube the 33, the 34 switching tube 34 is same brachium pontis; DC side first capacitor C 1, second capacitor C 2 and the 3rd capacitor C 3 are connected respectively and each brachium pontis two ends mutually, exchange inlet wire and are connected to each brachium pontis mid point respectively; First K switch 1, second switch K2 and the 3rd K switch 3 are the main circuit diverter switch, are series between electrical network and the equipment;
The PWM of described inversion control link output controls three single-phase full bridge circuit and comprises: A phase, control impuls are controlled the 41 switching tube 41 respectively, the 4th twelvemo is closed pipe the 42, the 43 switching tube the 43, the 44 switching tube 44; It is same brachium pontis that the 41 switching tube 41, the 4th twelvemo are closed pipe 42, and the 43 switching tube the 43, the 44 switching tube 44 is same brachium pontis; B phase, control impuls are controlled the 51 switching tube 51 respectively, the 5th twelvemo is closed pipe the 52, the 53 switching tube the 53, the 54 switching tube 54; It is same brachium pontis that the 51 switching tube 51, the 5th twelvemo are closed pipe 52, and the 53 switching tube the 53, the 54 switching tube 54 is same brachium pontis; C phase, control impuls are controlled the 61 switching tube 61, the 6th twelvemo respectively and are closed pipe the 62, the 63 switching tube 63, the and sixty-fourmo close pipe 64; It is same brachium pontis that the 61 switching tube 61, the 6th twelvemo close pipe 62, and the 63 switching tube 63, the closes sixty-fourmo that to manage 64 be same brachium pontis; DC side first capacitor C 1, second capacitor C 2 and the 3rd capacitor C 3 are connected respectively and each brachium pontis two ends mutually, A goes between to A inductance L a from the brachium pontis midpoint, A capacitor C a, B goes between to B inductance L b from the brachium pontis midpoint, B capacitor C b, C goes between to C inductance L c from the brachium pontis midpoint, C capacitor C c, and main circuit is gone in A capacitor C a, B capacitor C b and C capacitor C c series connection;
The hardware configuration of detection module is same as the prior art.
Described all switches are that IPM is as its switching device;
Rectification module among the present invention: use the PWM full-bridge rectification, dc voltage is stable, can reduce harmonic wave, and the guaranteed output factor is close to 1, and energy can two-way flow.
As seen from Figure 4: control system is made of two closed loops in rectification module, and outer shroud is a Voltage loop, and interior ring is an electric current loop.(the prior art pi regulator is actual to be a self-adjustable amplifier of amplification coefficient to the pi regulator of outer shroud, and in the time of dynamically, amplification coefficient is lower, is overshoot and vibration to occur for anti-locking system; When static, amplification coefficient is higher, and Ke Yi Pu is grasped little error signal, improves control precision.) output signal i
dMultiply by the reference sine wave signal with the phase voltage homophase, obtain and the synchronous sinusoidal command signal i of phase voltage
a *With the standard signal of this signal as reactor current, produce the error signal of phase current with the actual ac current signal back of comparing, multiply by a proportionality coefficient, deduct this amount with the AC side line voltage again, and relatively produce the pwm control signal of each switching device, by drive circuit power device is controlled at last as reference wave signal and triangular wave, thereby make actual interchange input current and voltage reach same-phase, input power factor is near 1.
Inversion module: use the PWM full-bridge inverting, three-phase output is separate, and can export zero sequence voltage component, and three-phase imbalance is had the good compensation characteristic;
As seen from Figure 5: control system adopts voltage and current double closed-loop control in inversion module:
In order to obtain better load regulation characteristic and stable voltage output, can directly control the output voltage of device, the control of the instantaneous value of output voltage can be regulated instantaneous value poor of reference voltage and output voltage by the PI link, can improve response speed and dynamic property, but only adopting the instantaneous voltage control mode is not fine for the adaptability of nonlinear load, the stability margin of simultaneity factor is not high, and parameter designing is difficulty relatively.So consider to introduce again the current instantaneous value feedback.Intend adopting the control of instantaneous voltage outer shroud, guarantee load voltage track reference voltage fast, the good response speed of assurance device is controlled the control of electric current LOCAL FEEDBACK as interior ring, to improve independence, guarantee the stable operation of various load behavior lower devices to parameter and load.
The state equation of known single-phase series inverter is
Msin (ω
rt
d) u
DcBe switching tube two brachium pontis output voltages.
When detection module detects voltage fluctuation among the present invention, the voltage of its storage is input to inversion module, needing obtains the three-phase alternating voltage of compensation,, be coupled by electric capacity and main circuit by filter circuit.
Detection module: adopt three-phase voltage detection method, detect electric voltage dropping and detect the power-factor of load simultaneously, have the dual characteristics of compensation power factor and electric voltage dropping based on instantaneous reactive power theory.
The instantaneous reactive theoretical breakthrough has systematically defined instantaneous power amounts such as instantaneous reactive power, instantaneous active power based on the power definition of mean value; Carry out matrixing by electric current, voltage, thereby try to achieve instantaneous active power and reactive power three-phase circuit.
By Fig. 7, Fig. 8 as seen: electrical network three-phase voltage u at first
a, u
bAnd u
cCarry out phase-lockedly,, again the sine and cosine value of this phase place is sent into the dq0 conversion module, with u with the phase-locked phase information that obtains
a, u
bAnd u
cCarry out trying to achieve u afterwards after the matrixing
d, u
qAnd u
0Next is to the voltage u of load
Loada, u
LoadbAnd u
LoadcCarry out phase-lockedly, again the sine and cosine value of the phase-locked phase place that obtains is sent into the dq0 conversion module, with i
Loada, i
LoadbAnd i
LoadcCarry out matrixing and obtain P and Q component, obtain the merit angle
To again-
The sine and cosine value and the reference amplitude of line voltage multiply each other, the value that obtains respectively with u
d, u
qAdd and subtract calculating, the value that obtains is sent into the dq0 inverse transform block, can obtain the required reference voltage level of inverter.
All rectifications among the present invention, inverter all adopt IPM as its switching device:
The main feature of dynamic electric voltage recovery device is can realize harmonic voltage, the instantaneous dynamic compensation that falls of voltage.Require main circuit can produce bucking voltage fast and accurately for this reason.The present PWM current transformer that adopted of main circuit is the generation circuit of desirable bucking voltage in theory.Owing to be subjected to the restriction of power device operating frequency, bucking voltage can not be followed the variation of command signal fully but in actual applications.In order to make bucking voltage follow the variation of command signal fast, must adopt the quick power device.And on the other hand, the selection of device also will be considered the size of compensation arrangement capacity.Therefore the device that uses needs to consider according to combined factors such as its voltage and current grade, switching frequencies.Switching device adopts Intelligent Power Module (Intelligent Power Module is called for short IPM) among the present invention.Intelligent Power Module is advanced mixing integrated power device, is made of high speed, the IPM chip of low consumption and the gate-drive and the protective circuit of optimization, and reliability is very high, and the switching frequency height is fit to be applied to dynamic electric voltage recovery device very much.When selecting IPM for use, mainly select rated voltage and the electric current of IPM according to the voltage and current in the side circuit.Surge voltage when considering switch and allowance, the rated voltage of selected IPM should be greater than dc voltage (desirable 1.5-2 doubly).The rated current of the IPM that selects for use also should be considered 1.5-2 allowance doubly.
The characteristics of 3 phase structure of the present invention can compensate imbalance of three-phase voltage, and have the characteristics of each phase independent compensation.Inverter output is not subjected to the restriction of main circuit structure, and is separate between the three-phase main circuit, controls flexible.
The present invention has thoroughly solved the compensation problem of imbalance of three-phase voltage; Simultaneously also can carry out each single-phase working alone, in a certain operate as normal that does not influence other two-phase when losing efficacy mutually;
Adopt the PWM rectifier to obtain direct voltage, have the power factor height, the few and stable characteristics of assurance dc voltage harmonic pollution in electric power net;
The LC filter uses electric capacity directly to be connected to the grid, and has reduced the control complexity of using filter to bring, has better improved the output waveform quality;
In the detection algorithm, not only detect electric voltage dropping, also the power-factor of load has been detected, made device have compensating reactive power, improved the characteristics of power factor.
Claims (4)
1. dynamic voltage compensator that adopts 3 phase structure, it is characterized in that comprising: the three-phase alternating voltage of electrical network is input to rectification module; Described rectification module is to adopt the PWM of rectification controlling unit output to control three single-phase full bridge circuit; The direct voltage of rectification module outputs to the dc energy storage module that is made of dc capacitor; Dc energy storage module direct current outputs to inversion module; Described inversion module is to adopt the PWM of inversion control link output to control three single-phase full bridge circuit; Inversion module outputs to the filtering module that is incorporated into the power networks; The described filtering module that is incorporated into the power networks is made of lc circuit, directly seals in electrical network by electric capacity; Detection module is input as the electric current and voltage analog signals of system, sends into the inverter controlling unit as the output of reference wave component.
2. the dynamic voltage compensator of employing 3 phase structure according to claim 1, it is characterized in that: the PWM of described rectification controlling unit output controls three single-phase full bridge circuit, comprise: A phase, control impuls are controlled the 11 switching tube (11) respectively, twelvemo is closed pipe (12), the 13 switching tube (13), the 14 switching tube (14); It is same brachium pontis that the 11 switching tube (11), twelvemo are closed pipe (12), and the 13 switching tube (13), the 14 switching tube (14) are same brachium pontis; B phase, control impuls are controlled the 21 switching tube (21) respectively, second twelvemo is closed pipe (22), the 23 switching tube (23), the 24 switching tube (24); It is same brachium pontis that the 21 switching tube (21), second twelvemo are closed pipe (22), and the 23 switching tube (23), the 24 switching tube (24) are same brachium pontis; C phase, control impuls are controlled the 31 switching tube (31) respectively, thirty-twomo closes pipe (32), the 33 switching tube (33), the 34 switching tube (34); It is same brachium pontis that the 31 switching tube (31), thirty-twomo close pipe (32); The 33 switching tube (33), the 34 switching tube (34) are same brachium pontis; DC side first electric capacity (C1), second electric capacity (C2) and the 3rd electric capacity (C3) are connected respectively and each brachium pontis two ends mutually, exchange inlet wire and are connected to each brachium pontis mid point respectively; First switch (K1), second switch (K2) and the 3rd switch (K3) are the main circuit diverter switch, are series between electrical network and the equipment.
3. the dynamic voltage compensator of employing 3 phase structure according to claim 1, it is characterized in that: the PWM of described inversion control link output controls three single-phase full bridge circuit and comprises: A phase, control impuls are controlled the 41 switching tube (41) respectively, the 4th twelvemo is closed pipe (42), the 43 switching tube (43), the 44 switching tube (44); It is same brachium pontis that the 41 switching tube (41), the 4th twelvemo are closed pipe (42), and the 43 switching tube (43), the 44 switching tube (44) are same brachium pontis; B phase, control impuls are controlled the 51 switching tube (51) respectively, the 5th twelvemo is closed pipe (52), the 53 switching tube (53), the 54 switching tube (54); It is same brachium pontis that the 51 switching tube (51), the 5th twelvemo are closed pipe (52), and the 53 switching tube (53), the 54 switching tube (54) are same brachium pontis; C phase, control impuls are controlled the 61 switching tube (61), the 6th twelvemo respectively and are closed pipe (62), the 63 switching tube (63), the and sixty-fourmo close pipe (64); It is same brachium pontis that the 61 switching tube (61), the 6th twelvemo close pipe (62), and the 63 switching tube (63), the closes sixty-fourmo that to manage (64) be same brachium pontis; DC side first electric capacity (C1), second electric capacity (C2) and the 3rd electric capacity (C3) are connected respectively and each brachium pontis two ends mutually, A goes between to A inductance (La) from the brachium pontis midpoint, A electric capacity (Ca), B goes between to B inductance (Lb) from the brachium pontis midpoint, B electric capacity (Cb), C goes between to C inductance (Lc) from the brachium pontis midpoint, C electric capacity (Cc), and main circuit is gone in A electric capacity (Ca), B electric capacity (Cb) and C electric capacity (Cc) series connection.
4. according to the dynamic voltage compensator of claim 2 or 3 described employing 3 phase structures, it is characterized in that: described all switches are that IPM is as its switching device.
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| CN200710039765A CN101291057B (en) | 2007-04-20 | 2007-04-20 | Dynamic voltage compensator adopting 3 phase structure |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101944854A (en) * | 2010-07-29 | 2011-01-12 | 深圳市安托山技术有限公司 | Novel frequency conversion device |
| CN102480126A (en) * | 2010-11-24 | 2012-05-30 | 湖南丰日电源电气股份有限公司 | High voltage direct current power supply with modules of different capacities working in parallel |
| CN102710141A (en) * | 2012-07-06 | 2012-10-03 | 山东新风光电子科技发展有限公司 | Four-quadrant cascade high-voltage frequency conversion device |
| CN102904286A (en) * | 2012-10-23 | 2013-01-30 | 深圳市长昊机电有限公司 | Grid-connected inverter and control method thereof |
| CN103457283A (en) * | 2013-09-17 | 2013-12-18 | 无锡力豪科技有限公司 | Super capacitor dynamic voltage recovery system and power supply system |
| CN104078971A (en) * | 2014-07-10 | 2014-10-01 | 广东工业大学 | Microgrid three-phase-balanced and electricity-optimized sub-grid structure and control method |
| CN108347176A (en) * | 2017-01-24 | 2018-07-31 | 中国电力科学研究院 | A kind of power amplifier for power system real-time simulation |
| CN114006542A (en) * | 2021-12-30 | 2022-02-01 | 苏州大学 | Unipolar modulation full-phase angle range power controller and working method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5469044A (en) * | 1995-01-05 | 1995-11-21 | Westinghouse Electric Corporation | Transmission line power flow controller with unequal advancement and retardation of transmission angle |
| US5610501A (en) * | 1995-02-01 | 1997-03-11 | Westinghouse Electric Corporation | Dynamic power and voltage regulator for an ac transmission line |
| US5949221A (en) * | 1998-05-21 | 1999-09-07 | Siemens Westinghouse Power Corporation | Line powered, primary side connected apparatus injecting voltage compensation into an electric power line using one transformer |
| CN1332489C (en) * | 2005-06-17 | 2007-08-15 | 华北电力大学（北京） | Multifunctional adjuster for quality of voltage in low voltage system |
| CN201061144Y (en) * | 2007-04-20 | 2008-05-14 | 上海输配电股份有限公司 | Dynamic voltage compensator using three single-phase structure |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101944854A (en) * | 2010-07-29 | 2011-01-12 | 深圳市安托山技术有限公司 | Novel frequency conversion device |
| CN102480126A (en) * | 2010-11-24 | 2012-05-30 | 湖南丰日电源电气股份有限公司 | High voltage direct current power supply with modules of different capacities working in parallel |
| CN102710141A (en) * | 2012-07-06 | 2012-10-03 | 山东新风光电子科技发展有限公司 | Four-quadrant cascade high-voltage frequency conversion device |
| CN102904286A (en) * | 2012-10-23 | 2013-01-30 | 深圳市长昊机电有限公司 | Grid-connected inverter and control method thereof |
| CN103457283A (en) * | 2013-09-17 | 2013-12-18 | 无锡力豪科技有限公司 | Super capacitor dynamic voltage recovery system and power supply system |
| CN103457283B (en) * | 2013-09-17 | 2016-01-20 | 无锡力豪科技有限公司 | A kind of super capacitor dynamic voltage recovery system and power-supply system |
| CN104078971A (en) * | 2014-07-10 | 2014-10-01 | 广东工业大学 | Microgrid three-phase-balanced and electricity-optimized sub-grid structure and control method |
| CN108347176A (en) * | 2017-01-24 | 2018-07-31 | 中国电力科学研究院 | A kind of power amplifier for power system real-time simulation |
| CN108347176B (en) * | 2017-01-24 | 2021-03-16 | 中国电力科学研究院有限公司 | Power amplifier for real-time simulation of electric power system |
| CN114006542A (en) * | 2021-12-30 | 2022-02-01 | 苏州大学 | Unipolar modulation full-phase angle range power controller and working method thereof |
| CN114006542B (en) * | 2021-12-30 | 2022-04-22 | 苏州大学 | Unipolar modulation full-phase angle range power controller and working method thereof |
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