CN103812118A - Front feed type non-series-transformer voltage drop compensation device based on wind electricity - Google Patents
Front feed type non-series-transformer voltage drop compensation device based on wind electricity Download PDFInfo
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- CN103812118A CN103812118A CN201410065526.8A CN201410065526A CN103812118A CN 103812118 A CN103812118 A CN 103812118A CN 201410065526 A CN201410065526 A CN 201410065526A CN 103812118 A CN103812118 A CN 103812118A
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
A front feed type non-series-transformer voltage drop compensation device based on wind electricity comprises a controller, a rectification unit, an H bridge inversion unit, a by-pass switch, a direct voltage sensor, a direct current sensor, an alternating voltage transformer and a grid connected inverter. When a power grid normally runs, the wind electricity feeds electric energy into the power grid through the grid connected inverter, and output voltage of a series compensator is zero. When the power grid breaks down and voltage of the power grid drops, the series compensator is controlled to rapidly output corresponding compensatory voltage so as to directly and dynamically compensate voltage drop and keep voltage of a load end unchanged, and accordingly a load is prevented from being influenced by faults of the power grid, and simultaneously the grid connected inverter is used to keep direct current bus voltage stable. The front feed non-series-transformer voltage drop compensation device based on the wind electricity solves problems in energy storage of a traditional series compensator due to the fact that wind energy is used, and accordingly has the characteristics of feeding forward and rapid power grid voltage change compensating of the wind electricity due to the fact that the grid connected inverter runs in a front feed mode, and is small in size and low in cost due to the fact that a series transformer is removed.
Description
Technical field
The present invention relates to quality of power supply technical field, particularly a kind of feed-forward type Voltage Series compensation arrangement based on wind-powered electricity generation.
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, cause production cost to increase as stopped work and restarting, the damage equipment that is quick on the draw, scrap semi-finished product, reduce product quality, cause marketing difficulty and infringement corporate image and and user's good commercial relations etc., 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) studies show that, power quality problem causes American industry in data every year, loss in material and productivity reaches 30,000,000,000 dollars of (Electric Power Research Institute, 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, requirement to quality of power supply level is more and more higher, voltage collapse (is subside, fall) be subject matter wherein, voltage is subside 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 that voltage subsides, although it is short that voltage is subside the time, but it can cause interruption or the shut-down of industrial process, and cause industrial process downtime be far longer than voltage and subside of accident itself time, therefore the loss that caused 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 address the above problem, dynamic voltage compensator is carried out to research both at home and abroad.Than UPS, dynamic voltage compensator can effectively solve the problem that voltage is subside.But energy storage problem is also perplexing the problem of dynamic voltage compensator always, although there is people to propose the advanced methods such as least energy injection method, extra energy storage affects all the time it and further promotes, develops.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of feed-forward type Voltage Series compensation arrangement based on wind-powered electricity generation, it takes full advantage of wind energy, and when electrical network is normal, it utilizes green wind energy, and wind energy is converted to electric energy, supplies with electrical network; In the time that line voltage breaks down, it exports corresponding voltage, and the difference of compensation network voltage is guaranteed that load voltage does not change, thereby protected load.
Technical solution of the present invention is as follows:
Feed-forward type based on wind-powered electricity generation is without a voltage falling compensation apparatus for series transformer, and feature is to form and comprises: controller, rectification unit, H bridge inversion unit, by-pass switch, direct current voltage sensor, DC current sensor, AC voltage transformer, combining inverter;
The annexation of above-mentioned parts is as follows:
The rectification 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 inversion unit, and the by-pass switch control end of described controller (1) is connected with the control end of described by-pass switch; The DC voltage input end of described controller is connected with the output of described direct current voltage sensor, the direct current input of described controller is connected with the output of described DC current sensor, the alternating current input of described controller is connected with the output of described AC voltage transformer, rotor speed, the rotor angle input signal input of described controller are connected with the code-disc output that tests the speed of synchronous generator, and the parallel network reverse control end of described controller is connected with the described corresponding control end of combining inverter;
The ac input end of described rectification unit is connected with the output of synchronous generator, and the DC output end of described rectification unit is connected with the DC bus end of described H bridge inversion unit, the DC bus end of combining inverter;
The two ends of described by-pass switch are connected with the ac output end of described H bridge inversion unit, and be serially connected in the power transmission line of electrical network, be connected with load end with the feeder ear of electrical network respectively, the control end of described by-pass switch is connected with the corresponding by-pass switch control end of described controller;
The input of described direct current voltage sensor is connected with the DC output end of described rectification unit, and its output is connected with the corresponding DC voltage input end of described controller;
The input of described DC 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 DC bus end of described combining inverter is connected with the DC bus end of described H bridge inversion unit and the DC output end of rectification unit, and the ac output end of described combining inverter 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 described feed-forward type based on wind-powered electricity generation is carried out the method for voltage compensation without the voltage compensating device of series transformer, its feature is, the method comprises the steps:
1) controller is measured alternating supply voltage U
s, rectification unit output direct voltage U
wwith direct current I
w, synchronous generator rotating speed and rotor angle;
2) calculate rectification unit active power of output P
w: P
w=U
w× I
w;
3) control rectification unit carries out the maximal power tracing of wind-powered electricity generation:
Wind energy maximal power tracing: judge this rectification unit active power of output P
wwhether be greater than output valve last time, if continue to increase the rotating speed of synchronous generator; Otherwise the rotating speed that maintains synchronous generator is constant;
4) establish U
s0for electrical network alternating supply voltage value when normal:
If electrical network is normal, alternating supply voltage US is equal to or higher than normal voltage U
s090% time, control by-pass switch conducting and control H bridge inversion unit no-output, the voltage that makes to inject supply and AC circuit is zero, controls combining inverter wind-powered electricity generation is injected to electrical network, feeds back to electrical network;
If electric network fault, alternating supply voltage US is lower than normal voltage U
s090% time, control by-pass switch and close, control described H bridge inversion unit, the voltage of its output is met: U
j=(U
s0-U
s), unnecessary wind-powered electricity generation is by controlling combining inverter to electrical network injecting power, if wind-powered electricity generation is inadequate, by controlling combining inverter to its DC bus injecting power, thereby it is stable to maintain DC bus-bar voltage.
Compared with prior art, feature of the present invention is as follows:
1., when line voltage falls, series connection output voltage, has protected important load;
2. cancelled series transformer, made that cost is lower, volume is less;
3. utilize wind energy, solve line voltage and subside the energy storage problem of the compensation of (rapid drawdown, fall).
4. combining inverter is taked feed-forward mode, thereby does not additionally increase the capacity of string benefit inversion unit.
Accompanying drawing explanation
Fig. 1 is the feed-forward type that the present invention is based on wind-powered electricity generation structural representation without the voltage compensating device of series transformer.
Fig. 2 is single-phase H bridge inversion 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.Final step needs to revise.
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 a kind of feed-forward type based on wind-powered electricity generation of the present invention without the voltage falling compensation apparatus of series transformer.As seen from the figure, feed-forward type based on wind-powered electricity generation, without a voltage falling compensation apparatus for series transformer, comprising: controller 1, rectification unit 2, H bridge inversion unit 3, by-pass switch 4, direct current voltage sensor 5, DC current sensor 6, AC voltage transformer 7, combining inverter 8.
The annexation of above-mentioned parts is as follows:
The rectification 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 inversion unit 3, and the by-pass switch control end of described controller (1) is connected with the control end of described by-pass switch 4; The DC voltage input end of described controller 1 is connected with the output of described direct current voltage sensor 5, the direct current input of described controller 1 is connected with the output of described DC current sensor 6, the alternating current input of described controller 1 is connected with the output of described AC voltage transformer 7, rotor speed, the rotor angle input signal input of described controller 1 are connected with the code-disc output that tests the speed of synchronous generator, and the parallel network reverse control end of described controller 1 is connected with the corresponding control end of described combining inverter 8;
The described ac input end of rectification unit 2 and the output of synchronous generator are connected, and the DC output end of described rectification unit 2 is connected with the DC bus end of described H bridge inversion unit 3, the DC bus end of combining inverter 8;
The two ends of described by-pass switch 4 are connected with the ac output end of described H bridge inversion unit 3, and be serially connected in the power transmission line of electrical network, be connected with load end with the feeder ear of electrical network respectively, the control end of described by-pass switch 4 is connected with the corresponding by-pass switch control end of described controller 1;
The input of described direct current voltage sensor 5 is connected with the DC output end of described rectification unit 2, and its output is connected with the corresponding DC voltage input end of described controller 1;
The input of described DC 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 DC bus end of described combining inverter 8 is connected with the DC bus end of described H bridge inversion unit 3 and the DC output end of rectification unit 2, and the ac output end of described combining inverter 8 is with electrical network common point voltage phase and connect.
Be implemented as follows:
Described by-pass switch 4, it is every is made up of a pair of anti-parallel thyristor, its conducting, shutoff have controller 1 to control, the maximal power tracing of wind energy controlled rectification unit 2 and carries out by described controller 1, the alternating current of synchronous generator output is converted to direct current, and the output of this rectification unit 2 is connected with the DC bus of combining inverter 8 with described H bridge inversion unit 3; The ac output end of this H bridge inversion 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 8 is connected with electrical network; The DC voltage input end of described controller 1 is connected with the output of direct current voltage sensor 5, the direct current input of described controller 1 is connected with the output of DC current sensor 6, measures respectively by direct current voltage sensor 5, DC current sensor 6 direct voltage, the direct current that rectification unit 2 is exported; The ac voltage input of described controller 1 is connected with AC voltage transformer 7 outputs, measures electrical network alternating supply voltage by AC voltage transformer 7.
When electrical network is normal, described controller 1 is controlled by-pass switch 4 conductings, and described controller 1 is controlled H bridge inversion unit 3 and made its no-output, by controlling combining inverter 8, makes wind-powered electricity generation pass through combining inverter 8 and injects electrical network; Line voltage lower than normal voltage 90% time, close rapidly by-pass switch 4, and control H bridge inversion unit 3 and carry out series voltage compensation, by combining inverter 8, unnecessary wind-powered electricity generation is injected to electrical network, when wind-powered electricity generation is not enough, by electrical network to DC bus feedback power, thereby maintain the constant of DC bus-bar voltage.
Fig. 2 is the topology diagram of single-phase H bridge, and three-phase structure is identical.
Fig. 3 is two level topology diagrams of three-phase grid-connected inverter.
Fig. 4 is series compensation control method block diagram, passes through surveyed direct voltage, direct current, calculates the power P of wind-powered electricity generation output
w, carry out the control of wind-powered electricity generation maximal power tracing; By the alternating voltage of detection of grid, judge that whether grid ac voltage is normal, in the time finding electric network fault, controller 1 is controlled inversion unit 3 and is exported corresponding alternating voltage variable quantity, controls combining inverter 8 wind-powered electricity generation is injected into electrical network.
Concrete steps are as follows:
1) controller 1 is measured alternating supply voltage U
s, the direct voltage U that exports of rectification unit 2
wwith direct current I
w, synchronous generator rotating speed and rotor angle;
2) calculate rectification unit 2 active power of output P
w: P
w=U
w× I
w;
3) control rectification unit 2 carries out the maximal power tracing of wind-powered electricity generation:
Wind energy maximal power tracing: judge this rectification unit 2 active power of output P
wwhether be greater than output valve last time, if continue to increase the rotating speed of synchronous generator; Otherwise the rotating speed that maintains synchronous generator is constant;
4) establish U
s0for electrical network alternating supply voltage value when normal:
If electrical network is normal, alternating supply voltage US is equal to or higher than normal voltage U
s090% time, control by-pass switch 4 conductings and control H bridge inversion unit 3 no-outputs, the voltage that makes to inject supply and AC circuit is zero, controls combining inverter 8 wind-powered electricity generation is injected to electrical network, feeds back to electrical network;
If electric network fault, alternating supply voltage US is lower than normal voltage U
s090% time, control by-pass switch 4 and close, control described H bridge inversion unit 3, the voltage of its output is met: U
j=(U
s0-U
s), unnecessary wind-powered electricity generation is by controlling combining inverter 8 to electrical network injecting power, if wind-powered electricity generation is inadequate, by controlling combining inverter 8 to its DC bus injecting power, thereby it is stable to maintain DC bus-bar voltage.
Claims (3)
1. the feed-forward type based on wind-powered electricity generation, without a voltage falling compensation apparatus for series transformer, is characterised in that to form to comprise: controller (1), rectification unit (2), H bridge inversion unit (3), by-pass switch (4), direct current voltage sensor (5), DC current sensor (6), AC voltage transformer (7), combining inverter (8);
The annexation of above-mentioned parts is as follows:
The rectification 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 inversion unit (3), and the by-pass switch control end of described controller (1) is connected with the control end of described by-pass switch (4), the DC voltage input end of described controller (1) is connected with the output of described direct current voltage sensor (5), the direct current input of described controller (1) is connected with the output of described DC 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 parallel network reverse control end of described controller (1) is connected with the corresponding control end of described combining inverter (8),
The ac input end of described rectification unit (2) is connected with the output of synchronous generator, and the DC output end of described rectification unit (2) is connected with the DC bus end of described H bridge inversion unit (3), the DC bus end of combining inverter (8);
The two ends of described by-pass switch (4) are connected with the ac output end of described H bridge inversion unit (3), and be serially connected in the power transmission line of electrical network, be connected with load end with the feeder ear of electrical network respectively, the control end of described by-pass switch (4) is connected with the corresponding by-pass switch control end of described controller (1);
The input of described direct current voltage sensor (5) is connected with the DC output end of described rectification unit (2), and its output is connected with the corresponding DC voltage input end of described controller (1);
The input of described DC 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 DC bus end of described combining inverter (8) is connected with the DC output end of the DC bus end of described H bridge inversion unit (3) and rectification unit (2), and the ac output end of described combining inverter (8) is with electrical network common point voltage phase and connect.
2. the feed-forward type based on wind-powered electricity generation according to claim 1, without the voltage falling compensation apparatus of series transformer, 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 feed-forward type based on wind-powered electricity generation described in claim 1 to carry out the method for voltage compensation without the voltage compensating device of series transformer, it is characterized in that, the method comprises the steps:
1) controller (1) is measured alternating supply voltage U
s, rectification unit (2) output direct voltage U
wwith direct current I
w, synchronous generator rotating speed and rotor angle;
2) calculate rectification unit (2) active power of output P
w: P
w=U
w× I
w;
3) control rectification unit (2) carries out the maximal power tracing of wind-powered electricity generation:
Wind energy maximal power tracing: judge this rectification unit (2) active power of output P
wwhether be greater than output valve last time, if continue to increase the rotating speed of synchronous generator; Otherwise the rotating speed that maintains synchronous generator is constant;
4) establish U
s0for electrical network alternating supply voltage value when normal:
If electrical network is normal, alternating supply voltage US is equal to or higher than normal voltage U
s090% time, control by-pass switch (4) conducting and control H bridge inversion unit (3) no-output, the voltage that makes to inject supply and AC circuit is zero, controls combining inverter (8) wind-powered electricity generation is injected to electrical network, feeds back to electrical network;
If electric network fault, alternating supply voltage US is lower than normal voltage U
s090% time, control by-pass switch (4) and close, control described H bridge inversion unit (3), the voltage of its output is met: U
j=(U
s0-U
s), unnecessary wind-powered electricity generation is by controlling combining inverter (8) to electrical network injecting power, if wind-powered electricity generation is inadequate, by controlling combining inverter (8) to its DC bus injecting power, thereby it is stable to maintain DC bus-bar voltage.
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|---|---|---|---|
| CN201410065526.8A CN103812118A (en) | 2014-02-26 | 2014-02-26 | Front feed type non-series-transformer voltage drop compensation device based on wind electricity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410065526.8A CN103812118A (en) | 2014-02-26 | 2014-02-26 | Front feed type non-series-transformer voltage drop compensation device based on wind electricity |
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| CN103812118A true CN103812118A (en) | 2014-05-21 |
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ID=50708505
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|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104108A (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 |
| 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 |
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|---|---|---|---|---|
| WO2009145380A1 (en) * | 2008-05-30 | 2009-12-03 | Kunsan National University Industry-Academy Cooperation Foundation | A grid-interactive photovoltaic generation system with power quality control and energy saving |
| CN103390901A (en) * | 2013-08-15 | 2013-11-13 | 东南大学 | Comprehensive series compensation voltage ride-through device of wind turbine generator and control method |
| CN103441505A (en) * | 2013-09-11 | 2013-12-11 | 国网山东省电力公司聊城供电公司 | Wind-powder-based electric power quality cascade compensation method and device |
-
2014
- 2014-02-26 CN CN201410065526.8A patent/CN103812118A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009145380A1 (en) * | 2008-05-30 | 2009-12-03 | Kunsan National University Industry-Academy Cooperation Foundation | A grid-interactive photovoltaic generation system with power quality control and energy saving |
| CN103390901A (en) * | 2013-08-15 | 2013-11-13 | 东南大学 | Comprehensive series compensation voltage ride-through device of wind turbine generator and control method |
| CN103441505A (en) * | 2013-09-11 | 2013-12-11 | 国网山东省电力公司聊城供电公司 | Wind-powder-based electric power quality cascade compensation method and device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104108A (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 |
| 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 |
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Application publication date: 20140521 |