CN103812113B - A kind of Voltage Drop dynamic compensating device of the feed-forward type based on wind-light-electricity complementary - Google Patents
A kind of Voltage Drop dynamic compensating device of the feed-forward type based on wind-light-electricity complementary Download PDFInfo
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- CN103812113B CN103812113B CN201410065312.0A CN201410065312A CN103812113B CN 103812113 B CN103812113 B CN 103812113B CN 201410065312 A CN201410065312 A CN 201410065312A CN 103812113 B CN103812113 B CN 103812113B
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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
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Abstract
Based on a Voltage Drop dynamic compensating device for the feed-forward type of wind-light-electricity complementary, comprising: controller, rectification unit, H bridge inverter unit, by-pass switch, wind power direct current voltage sensor, wind power direct current current sensor, AC voltage transformer, DC boosting unit, photoelectricity direct current voltage sensor, photoelectric direct current transducer, combining inverter.When electrical network normally runs, wind-light-electricity is by combining inverter to electrical network feed-in electric energy, and series compensator output voltage is zero; When grid collapses causes grid voltage sags (subside, rapid drawdown), control series compensator and export corresponding bucking voltage amount fast, direct dynamic compensation Voltage Drop, the voltage of load end is remained unchanged, thus protection load is not by the impact of electric network fault, maintain the stable of DC bus-bar voltage; Which utilizes the complementation of wind/photoelectricity, have complementation feedforward and the feature compensating grid voltage change fast of wind-powered electricity generation, solar photovoltaic generating, volume is less, cost is lower.
Description
Technical field
The present invention relates to quality of power supply technical field, particularly a kind of Voltage Drop dynamic compensating device of the feed-forward type based on wind-light-electricity complementary.
Background technology
Developed country is very high to the requirement of quality of power supply level, power quality problem not only can bring very large economic loss to industrial quarters, production cost is caused to increase as stopped work and restarting, damage is quick on the draw equipment, scrap semi-finished product, reduce product quality, cause marketing difficulty and damage corporate image and the good commercial relations etc. with user, and bring harm can to the equipment of the important electricity consumption departments such as medical treatment, cause serious production and interruption of service, EPRI-Electric Power Research Institute (EPRI) research display, power quality problem causes American industry in data every year, loss in material and productivity reaches 30,000,000,000 dollars of (ElectricPowerResearchInstitute, 1999), the developed countries such as Japan require also very high to the quality of power supply.Along with developing rapidly of China's high-technology industry, more and more higher to the requirement of quality of power supply level, voltage collapse (is subside, fall) be subject matter wherein, voltage subsides the quality of voltage problem that not only can cause electric power system, also the trouble free service of entail dangers to power consumption equipment, electric power system fault, large-size machine starts, subcircuits short circuit etc. all can cause voltage to subside, although it is short that voltage subsides the time, but it can cause interruption or the shut-down of industrial process, and the downtime of caused industrial process is far longer than itself time that voltage subsides accident, therefore caused loss is very large.
Traditional method, as voltage regulator can not address these problems, though and uninterrupted power supply UPS device can address these problems, but its cost and operating cost are all extremely expensive, in order to solve the problem, research is carried out to dynamic voltage compensator both at home and abroad.Compared to UPS, dynamic voltage compensator effectively can solve the problem that voltage is subside.But energy storage problem also annoyings the problem of dynamic voltage compensator always, although there is people to propose the method for the advanced persons such as least energy injection method, extra energy storage affects its further genralrlization, development all the time.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of Voltage Drop dynamic compensating device of the feed-forward type based on wind-light-electricity complementary, when electrical network is normal, utilizes green wind energy, solar energy, wind energy, solar energy are converted to electric energy, supply electrical network; When line voltage breaks down, export corresponding voltage, the difference of compensation network voltage, guarantee that load voltage does not change, thus protect load.
Technical solution of the present invention is as follows:
Based on a Voltage Drop dynamic compensating device for the feed-forward type of wind-light-electricity complementary, feature is that formation comprises: controller, rectification unit, H bridge inverter unit, by-pass switch, wind power direct current voltage sensor, wind power direct current current sensor, AC voltage transformer, DC boosting unit, photoelectricity direct current voltage sensor, photoelectric direct current transducer, combining inverter;
The annexation of above-mentioned parts is as follows:
The rectify control end of described controller is connected with the input control end of described rectification unit, the H bridge inversion control end of described controller is connected with the input control end of described H bridge inverter unit, the DC boosting control end of described controller is connected with the input control end of DC boosting unit, and the by-pass switch control end of described controller (1) is connected with the control end of described by-pass switch, the wind power direct current voltage input end of described controller is connected with the output of described wind power direct current voltage sensor, the wind power direct current current input terminal of described controller is connected with the output of described wind power direct current current sensor, the alternating current input of described controller is connected with the output of described AC voltage transformer, the rotor speed of described controller, rotor angle input signal input is connected with the code-disc output that tests the speed of synchronous generator, the photoelectricity DC voltage input end of described controller is connected with the output of described photoelectricity direct current voltage sensor, the photoelectric direct current input of described controller is connected with the output of described photoelectric direct current transducer, the control end that the parallel network reverse control end of described controller is corresponding to described combining inverter is connected,
The ac input end of described rectification unit is connected with the output of wind-powered electricity generation synchronous generator, and the DC output end of described rectification unit is connected with the DC output end of described DC boosting unit;
Be connected with the DC bus end of described combining inverter, the DC bus end of H bridge inverter unit after the DC output end of described rectification unit is connected with the DC output end of DC boosting unit;
The two ends of described by-pass switch are connected with the ac output end of described H bridge inverter unit, and are serially connected in the power transmission line of electrical network, are connected respectively with the feeder ear of electrical network with load end;
The input of described wind power direct current voltage sensor is connected with the DC output end of described rectification unit;
The input of described wind power direct current current sensor is serially connected with the DC output end of described rectification unit;
The input of described AC voltage transformer is connected with electrical network common point voltage;
The described direct-flow input end of DC boosting unit is connected with the output of photovoltaic battery panel, and the DC output end of described DC boosting unit is connected with the direct-flow input end of described H bridge inverter unit with the input of described photoelectricity direct current voltage sensor, the input of described photoelectric direct current transducer;
The DC bus end of described combining inverter is connected with the DC bus end of described H bridge inverter unit, and the ac output end of the combining inverter described in it is with electrical network common point voltage phase and connect.
Described controller is realized by CPU, and its core is digital signal processor, single-chip microcomputer or computer.
The Voltage Drop dynamic compensating device of the feed-forward type based on wind-light-electricity complementary described in utilization carries out the method for dynamic compensation, and its feature is, the method comprises following concrete steps:
1) alternating supply voltage U measured by controller
s, rectification unit export direct voltage U
wwith direct current I
w, DC boosting unit export direct voltage U
pVwith direct current I
pV, synchronous generator rotating speed and rotor angle;
2) rectification unit active power of output P is calculated
w: P
w=U
w× I
w;
3) DC boosting unit active power of output P is calculated
pV: P
pV=U
pV× I
pV;
4) control rectification unit and DC boosting unit carry out the complementary output of scene:
Wind energy maximal power tracing: judge this rectification unit active power of output P
wwhether be greater than output valve last time, if then continue to increase synchronous generator rotating speed; Otherwise, maintain synchronous generator rotating speed constant;
Solar maximum power is followed the tracks of: judge this DC boosting unit active power of output P
pVwhether be greater than output valve last time, if then continue to increase duty ratio; Otherwise, maintain duty ratio constant;
5) U is established
s0for electrical network normal time alternating supply voltage value:
If electrical network is normal, i.e. alternating supply voltage U
sbe equal to or higher than normal voltage U
s090% time, then control by-pass switch conducting and control H bridge inverter unit no-output, making the voltage of injection supply and AC circuit be zero; Control combining inverter and wind-powered electricity generation, photoelectricity are injected electrical network, feed back to electrical network;
If electric network fault, i.e. alternating supply voltage U
slower than normal voltage U
s090% time, then control by-pass switch close, the voltage that the H bridge inverter unit described in control makes it export meet: U
j=(U
s0-U
s), unnecessary wind-powered electricity generation, photoelectricity by controlling combining inverter to electrical network injecting power, if wind-powered electricity generation, photoelectricity are inadequate, then by combining inverter to its DC bus injecting power, thus maintain DC bus-bar voltage and stablize.
Compared with prior art, feature of the present invention is as follows:
1., during grid voltage sags, series connection output voltage, protects important load;
2. eliminate series transformer, such that cost is lower, volume is less;
3. utilize the complementation of wind energy, solar energy, solve the energy storage problem that line voltage subsides the compensation of (rapid drawdown, fall).
4. combining inverter takes feed-forward mode, thus does not additionally increase series transformer and go here and there the capacity mending inversion unit.
Accompanying drawing explanation
Fig. 1 is the structural representation of the Voltage Drop dynamic compensating device of the feed-forward type that the present invention is based on wind-light-electricity complementary.
Fig. 2 is single-phase H bridge inverter unit topological diagram of the present invention.
Fig. 3 is combining inverter topological diagram of the present invention.
Fig. 4 is series compensation control block diagram of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but should not limit the scope of the invention with this.
First refer to Fig. 1, Fig. 1 is the structural representation of the Voltage Drop dynamic compensating device of the feed-forward type that the present invention is based on wind-light-electricity complementary.As seen from the figure, based on a Voltage Drop dynamic compensating device for the feed-forward type of wind-light-electricity complementary, comprising: controller 1, rectification unit 2, H bridge inverter unit 3, by-pass switch 4, wind power direct current voltage sensor 5, wind power direct current current sensor 6, AC voltage transformer 7, DC boosting unit 8, photoelectricity direct current voltage sensor 9, photoelectric direct current transducer 10, combining inverter 11.
The rectify control end of described controller 1 is connected with the input control end of described rectification unit 2, the H bridge inversion control end of described controller 1 is connected with the input control end of described H bridge inverter unit 3, the DC boosting control end of described controller 1 is connected with the input control end of DC boosting unit 8, and the by-pass switch control end of described controller (1) is connected with the control end of described by-pass switch 4, the wind power direct current voltage input end of described controller 1 is connected with the output of described wind power direct current voltage sensor 5, the wind power direct current current input terminal of described controller 1 is connected with the output of described wind power direct current current sensor 6, the alternating current input of described controller 1 is connected with the output of described AC voltage transformer 7, the rotor speed of described controller 1, rotor angle input signal input is connected with the code-disc output that tests the speed of synchronous generator, the photoelectricity DC voltage input end of described controller 1 is connected with the output of described photoelectricity direct current voltage sensor 9, the photoelectric direct current input of described controller 1 is connected with the output of described photoelectric direct current transducer 10, the control end that the parallel network reverse control end of described controller 1 is corresponding to described combining inverter 11 is connected,
The ac input end of described rectification unit 2 is connected with the output of wind-powered electricity generation synchronous generator, and the DC output end of described rectification unit 2 is connected with the DC output end of described DC boosting unit 8;
Be connected with the DC bus end of described combining inverter 11, the DC bus end of H bridge inverter unit 3 after the DC output end of described rectification unit 2 is connected with the DC output end of DC boosting unit 8;
The two ends of described by-pass switch 4 are connected with the ac output end of described H bridge inverter unit 3, and are serially connected in the power transmission line of electrical network, are connected respectively with the feeder ear of electrical network with load end;
The input of described wind power direct current voltage sensor 5 is connected with the DC output end of described rectification unit 2;
The input of described wind power direct current current sensor 6 is serially connected with the DC output end of described rectification unit 2;
The input of described AC voltage transformer 7 is connected with electrical network common point voltage;
The described direct-flow input end of DC boosting unit 8 is connected with the output of photovoltaic battery panel, and the DC output end of described DC boosting unit 8 is connected with the direct-flow input end of described H bridge inverter unit 3 with the input of the input of described photoelectricity direct current voltage sensor 9, described photoelectric direct current transducer 10;
The DC bus end of described combining inverter 11 is connected with the DC bus end of described H bridge inverter unit 3, and the ac output end of the combining inverter 11 described in it is with electrical network common point voltage phase and connect.
Be implemented as follows:
Described by-pass switch 4, it is often made up of a pair anti-parallel thyristor, its conducting, turn off and controlled by controller 1, described controller 1 controls the maximal power tracing that rectification unit 2 carries out wind energy, the alternating current that synchronous generator exports is converted to direct current, described controller 1 controls DC boosting unit 8 pairs of solar energy and carries out maximal power tracing, the direct current exported by photovoltaic generation raises as direct current, and the output of this rectification unit 2 and the output of DC boosting unit 8 are connected with the DC bus of combining inverter 11 with described H bridge inverter unit 3; The ac output end of this H bridge inverter unit 3 is connected with the two ends of described by-pass switch 4, and described by-pass switch 4 is serially connected in the power transmission line of electrical network, is connected respectively with mains supply end with load end, and the ac output end of combining inverter 11 is connected with electrical network; The DC voltage input end of described controller 1 is connected with the output of wind power direct current voltage sensor 5 and photoelectricity direct current voltage sensor 9 respectively, the direct current input of described controller 1 is connected with the output of wind power direct current current sensor 6 and photoelectric direct current transducer 10 respectively, is measured direct voltage, the direct current of rectification unit 2 output by direct current voltage sensor 5, DC current sensor 6 respectively; Direct voltage, the direct current of DC boosting unit 8 output is measured respectively by direct current voltage sensor 9, DC current sensor 10; The ac voltage input of described controller 1 is connected with AC voltage transformer 7 output, measures electrical network alternating supply voltage by AC voltage transformer 7.
When electrical network is normal, described controller 1 controls by-pass switch 4 conducting, controls H bridge inverter unit 3 no-output, by controlling combining inverter 11, makes wind-powered electricity generation, photoelectricity inject electrical network by combining inverter 11; Line voltage lower than normal voltage 90% time, rapid closedown by-pass switch 4, and control H bridge inverter unit 3 carries out series voltage compensation, by combining inverter 11, unnecessary wind-powered electricity generation, photoelectricity are injected electrical network, when wind-powered electricity generation, photoelectricity are not enough, by electrical network to DC bus feedback power, thus maintain the constant of DC bus-bar voltage.
Fig. 4 is serial connection compensation control method block diagram, passes through surveyed direct voltage, direct current, the power P that calculating wind-powered electricity generation and photovoltaic generation export
wwith P
pV, carry out wind-powered electricity generation and photovoltaic maximum power tracing control; By the alternating voltage of detection of grid, judge that whether grid ac voltage is normal, when finding electric network fault, controller 1 controls inversion unit 3 and exports corresponding alternating voltage variable quantity, controls combining inverter 11 and wind-powered electricity generation, photoelectricity are injected into electrical network.
Concrete steps are as follows:
1) alternating supply voltage U measured by controller 1
s, rectification unit 2 export direct voltage U
wwith direct current I
w, DC boosting unit 8 export direct voltage U
pVwith direct current I
pV, synchronous generator rotating speed and rotor angle;
2) rectification unit 2 active power of output P is calculated
w: P
w=U
w× I
w;
3) DC boosting unit 8 active power of output P is calculated
pV: P
pV=U
pV× I
pV;
4) control rectification unit 2 and carry out honourable complementary output with DC boosting unit 8:
Wind energy maximal power tracing: judge this rectification unit 2 active power of output P
wwhether be greater than output valve last time, if then continue to increase synchronous generator rotating speed; Otherwise, maintain synchronous generator rotating speed constant;
Solar maximum power is followed the tracks of: judge this DC boosting unit 8 active power of output P
pVwhether be greater than output valve last time, if then continue to increase duty ratio; Otherwise, maintain duty ratio constant;
5) U is established
s0for electrical network normal time alternating supply voltage value:
If electrical network is normal, i.e. alternating supply voltage U
sbe equal to or higher than normal voltage U
s090% time, then control by-pass switch 4 conducting and control H bridge inverter unit 3 no-output, making the voltage of injection supply and AC circuit be zero; Control combining inverter 11 and wind-powered electricity generation, photoelectricity are injected electrical network, feed back to electrical network;
If electric network fault, i.e. alternating supply voltage U
slower than normal voltage U
s090% time, then control by-pass switch 4 close, the voltage that the H bridge inverter unit 3 described in control makes it export meet: U
j=(U
s0-U
s), unnecessary wind-powered electricity generation, photoelectricity, by controlling combining inverter 11 to electrical network injecting power, if wind-powered electricity generation, photoelectricity are inadequate, then pass through combining inverter 11 to its DC bus injecting power, thus maintenance DC bus-bar voltage are stablized.
Claims (3)
1. based on a Voltage Drop dynamic compensating device for the feed-forward type of wind-light-electricity complementary, be characterised in that formation comprises: controller (1), rectification unit (2), H bridge inverter unit (3), by-pass switch (4), wind power direct current voltage sensor (5), wind power direct current current sensor (6), AC voltage transformer (7), DC boosting unit (8), photoelectricity direct current voltage sensor (9), photoelectric direct current transducer (10), combining inverter (11);
The annexation of above-mentioned parts is as follows:
The rectify control end of described controller (1) is connected with the input control end of described rectification unit (2), the H bridge inversion control end of described controller (1) is connected with the input control end of described H bridge inverter unit (3), the DC boosting control end of described controller (1) is connected with the input control end of DC boosting unit (8), and the by-pass switch control end of described controller (1) is connected with the control end of described by-pass switch (4), the wind power direct current voltage input end of described controller (1) is connected with the output of described wind power direct current voltage sensor (5), the wind power direct current current input terminal of described controller (1) is connected with the output of described wind power direct current current sensor (6), the alternating current input of described controller (1) is connected with the output of described AC voltage transformer (7), the wind-powered electricity generation synchronous generator rotor rotating speed of described controller (1), rotor angle input signal input is connected with the code-disc output that tests the speed of wind-powered electricity generation synchronous generator, the photoelectricity DC voltage input end of described controller (1) is connected with the output of described photoelectricity direct current voltage sensor (9), the photoelectric direct current input of described controller (1) is connected with the output of described photoelectric direct current transducer (10), the parallel network reverse control end of described controller (1) is connected with the corresponding control end of described combining inverter (11),
The ac input end of described rectification unit (2) is connected with the output of wind-powered electricity generation synchronous generator, and the DC output end of described rectification unit (2) is connected with the DC output end of described DC boosting unit (8);
Be connected with the DC bus end of described combining inverter (11), the DC bus end of H bridge inverter unit (3) after the DC output end of described rectification unit (2) is connected with the DC output end of DC boosting unit (8);
The two ends of described by-pass switch (4) are connected with the ac output end of described H bridge inverter unit (3), and being serially connected in the power transmission line of electrical network, the ac output end of described H bridge inverter unit (3) is connected with load end with the feeder ear of electrical network respectively;
The input of described wind power direct current voltage sensor (5) is connected with the DC output end of described rectification unit (2);
The input of described wind power direct current current sensor (6) is serially connected with the DC output end of described rectification unit (2);
The input of described AC voltage transformer (7) is connected with electrical network common point;
The direct-flow input end of described DC boosting unit (8) is connected with the output of photovoltaic battery panel, the DC output end of described DC boosting unit (8) is connected with the input of described photoelectricity direct current voltage sensor (9), and the input of described photoelectric direct current transducer (10) is connected with the direct-flow input end of described H bridge inverter unit (3);
The DC bus end of described combining inverter (11) is connected with the DC bus end of described H bridge inverter unit (3), and the ac output end of described combining inverter (11) is connected with electrical network common point.
2. the Voltage Drop dynamic compensating device of the feed-forward type based on wind-light-electricity complementary according to claim 1, it is characterized in that, described controller (1) is realized by CPU, and its core is digital signal processor, single-chip microcomputer or computer.
3. utilize the Voltage Drop dynamic compensating device of the feed-forward type based on wind-light-electricity complementary described in claim 1 to carry out the method for dynamic compensation, it is characterized in that, the method comprises following concrete steps:
1) alternating supply voltage U measured by controller (1)
s, the direct voltage U that exports of rectification unit (2)
wwith direct current I
w, the direct voltage U that exports of DC boosting unit (8)
pVwith direct current I
pV, wind-powered electricity generation synchronous generator rotor rotating speed and rotor angle;
2) rectification unit (2) active power of output P is calculated
w: P
w=U
w× I
w;
3) DC boosting unit (8) active power of output P is calculated
pV: P
pV=U
pV× I
pV;
4) control rectification unit (2) and carry out honourable complementary output with DC boosting unit (8):
Wind energy maximal power tracing: judge this rectification unit (2) active power of output P
wwhether be greater than output valve last time, if then continue to increase wind-powered electricity generation synchronous generator rotor rotating speed; Otherwise, maintain wind-powered electricity generation synchronous generator rotor rotating speed constant;
Solar maximum power is followed the tracks of: judge this DC boosting unit (8) active power of output P
pVwhether be greater than output valve last time, if then continue to increase duty ratio; Otherwise, maintain duty ratio constant;
5) U is established
s0for electrical network normal time alternating supply voltage value:
If electrical network is normal, i.e. alternating supply voltage U
sbe equal to or higher than normal voltage U
s090% time, then control by-pass switch (4) conducting and control H bridge inverter unit (3) no-output, make the voltage of injection supply and AC circuit be zero; Control combining inverter (11) and wind-powered electricity generation, photoelectricity are injected electrical network, feed back to electrical network;
If electric network fault, i.e. alternating supply voltage U
slower than normal voltage U
s090% time, then control by-pass switch (4) close, the voltage that the H bridge inverter unit (3) described in control makes it export meet: U
j=(U
s0-U
s), unnecessary wind-powered electricity generation, photoelectricity, by controlling combining inverter (11) to electrical network injecting power, if wind-powered electricity generation, photoelectricity are inadequate, then pass through combining inverter (11) to DC bus injecting power, thus maintenance DC bus-bar voltage are stablized.
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|---|---|---|---|
| CN201410065312.0A CN103812113B (en) | 2014-02-26 | 2014-02-26 | A kind of Voltage Drop dynamic compensating device of the feed-forward type based on wind-light-electricity complementary |
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|---|---|---|---|
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| CN104104086A (en) * | 2014-06-27 | 2014-10-15 | 国家电网公司 | Feedforward voltage drop or surge compensation device based on wind and photoelectric complementation, and method |
| CN104104109A (en) * | 2014-06-27 | 2014-10-15 | 国家电网公司 | Feedforward voltage drop or surge compensation device based on wind power, and method |
| CN104104087A (en) * | 2014-06-27 | 2014-10-15 | 国家电网公司 | Feedforward voltage drop and surge compensation device based on wind and photoelectric complementation, and method |
| CN104283493A (en) * | 2014-09-29 | 2015-01-14 | 苏州克兰兹电子科技有限公司 | Power generating device with wind power and solar energy utilized |
| CN106505728B (en) * | 2016-12-26 | 2023-08-04 | 天津瑞源电气有限公司 | Power supply control loop of wind power doubly-fed converter in grid connection |
| CN109672166B (en) * | 2017-10-17 | 2023-05-19 | 丰郅(上海)新能源科技有限公司 | Power optimization system and optimization method thereof |
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| CN102244498A (en) * | 2011-03-11 | 2011-11-16 | 西门子公司 | Power generating unit driver, power generating unit and energy output equipment in power grid |
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| US8848400B2 (en) * | 2012-02-15 | 2014-09-30 | General Electric Company | System and method for reactive power regulation |
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| EP2530816A2 (en) * | 2011-05-30 | 2012-12-05 | General Electric Company | System and method for converter switching frequency control |
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