CN103986136A - Novel multifunctional fault current limiting system based on optical storage technology and control method thereof - Google Patents
Novel multifunctional fault current limiting system based on optical storage technology and control method thereof Download PDFInfo
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- CN103986136A CN103986136A CN201410168074.6A CN201410168074A CN103986136A CN 103986136 A CN103986136 A CN 103986136A CN 201410168074 A CN201410168074 A CN 201410168074A CN 103986136 A CN103986136 A CN 103986136A
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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
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention discloses a novel multifunctional fault current limiting system based on an optical storage technology and a control method thereof. The novel multifunctional fault current limiting system mainly comprises a photovoltaic power generation part, a storage battery energy storage part, a PWM converter and a fault current limiting part. The photovoltaic power generation part, the storage battery energy storage part and the PWM converter share a DC bus, and energy is exchanged among the photovoltaic power generation part, the storage battery energy storage part and the PWM converter. When the voltage quality problems of falling, rising and three-phase imbalance happen to the voltage of a power grid, compensating voltages are provided for the power grid through the PWM converter. Meanwhile, when short circuit faults of different types happen to the power grid, the system intrudes inductance into the system for current limiting by controlling the fault current limiting part. The novel multifunctional current fault current limiting system based on the optical storage technology and the control method thereof can achieve the purposes of stabilizing the load power supply voltage, improving the power supply quality and limiting short circuit currents through solar energy resources.
Description
Technical field
The invention belongs to electric power and technical field of new energies, relate to a kind of Multifunction fault current limiting system and control method thereof based on light storage technology.
Background technology
Along with the continuous expansion of development and the system scale of modern power systems, the capacity of short circuit of system increases thereupon, causes short circuit current under failure condition to increase, more and more higher to the requirement of primary equipment capacity.Yet primary side equipment manufacturing technology is not but obtained pleasurable achievement, cause the contradiction between the two constantly to highlight.Simultaneously, along with various non-linear, impacts and unbalanced load constantly access electrical network, cause that power network current, voltage waveform distort, the quality of voltage problem such as cause that line voltage falls, and to electric power system and user, caused a large amount of economic losses thus.
The current limiting technique scheme of existing comparative maturity is mainly series reactor or increase on the line interrupter device on bus.Bus series reactance only can be realized the function of failure current limit, owing to being serially connected in for a long time in electrical network, expends a large amount of power, and choosing of series reactance can not be too large, causes current limitation effect not good, can not solve the impact of quality of voltage problem on electrical network and user simultaneously.
Summary of the invention
In order to solve the problems of the technologies described above, the invention discloses a kind of Multifunction fault current limiting system and control method thereof based on light storage technology, not only can realize grid short circuit current-limiting function, and can solve voltage swell, fall and the power quality problem such as three-phase imbalance problem temporarily.The present invention has set forth topological structure and the control method of the Multifunction fault current limiting system based on light storage technology.
Technical scheme of the present invention is as follows:
A Multifunction fault current limiting system based on light storage technology, the present invention is characterised in that, fault current limiting system is connected to PWM current transformer, and PWM current transformer connects respectively photovoltaic generating system, energy-storage system of accumulator; Wherein fault current limiting system is by series transformer, and bidirectional triode thyristor and reactance capacitive filter form; Photovoltaic generating system is comprised of photovoltaic array and boost booster circuit; Energy-storage system of accumulator is comprised of batteries and buck/boost charge-discharge circuit; PWM current transformer is comprised of three-phase H fully controlled bridge.
The boost booster circuit DC bus of photovoltaic generating system of the present invention, energy-storage system of accumulator buck/boost charge-discharge circuit DC bus adopt parallel form to be connected with PWM current transformer DC bus.
The DC bus that parallel form of the present invention connects, its energy storage flat wave capacitor adopts electric capacity connection in series-parallel to connect and realizes, and electric capacity adopts resistance all to press.
Fault current limiting system series transformer secondary side of the present invention adopts star connection, and star mid point is connected to dc-link capacitance mid point.
The control method of a kind of Multifunction fault current limiting system based on light storage technology of the present invention, is characterized in that, controls step as follows:
<1> detects the output voltage U of Photovoltaic array
pvwith output current I
pV, the output voltage reference value of calculating MPPT controller
with photovoltaic array actual value U
pvdeviation, after pi regulator is controlled, modulate, obtain the switching signal of boost circuit, thereby control the output voltage U of Photovoltaic array
pvrealizing MPPT follows the tracks of;
<2> calculates the power output P of Photovoltaic array
pvbe input to PWM current transformer power P
in, work as P
pv>P
intime, battery-operated recharges pattern, k=1; Work as P
pv<P
intime, battery-operated is at discharge mode, k=-1;
The difference of <3> DC-side Voltage Stabilization standard value and actual value adopts PI regulating and controlling, and the instruction after adjusting is as current-order, and actual current is I
bat, instruction current and kI
batdifference adopt PI regulating and controlling, after ovennodulation, obtain the switching signal of buck/boost charge-discharge circuit;
<4> catches voltage-phase, generates the stereotyped command of required each phase voltage compensating to, according to the numerical computations voltage fluctuation compensating instruction of stereotyped command and virtual voltage; Voltage fluctuation compensating instruction and output voltage subtract each other, and obtain the pwm signal of this phase brachium pontis after fixed-frequency hysteresis comparator;
<5>, according to line current judgement short circuit malfunction situation, forms two paths of signals: a road signal blocks fault phase PWM current transformer power device IGBT as block signal when short circuit current surpasses operating value; One road signal is as the conducting control signal of bidirectional triode thyristor, by the conducting of fault phase bidirectional triode thyristor;
<6>, after short trouble is eliminated, first removes the Continuity signal of bidirectional triode thyristor, treats that controllable silicon closes to have no progeny, and recovers the control of fault phase current transformer, removes its block signal.
Beneficial effect of the present invention: novel many merits fault current limiting system and the control method thereof based on light storage technology provided by the invention, it can suppress rapidly the short circuit current under the dissimilar short trouble of system, the equipment of protection electric power system and customer charge; Current limiting system can bucking voltage lifting, fall and imbalance of three-phase voltage, improves power system power supply reliability, stability, improves the supply power voltage quality of user's side; The DC side power supply of current limiting system is provided by light storage technology, when voltage compensation, the solar energy after transforming is sent into electrical network, take full advantage of clean energy resource.Novel many merits fault current limiting system and control method thereof based on light storage technology provided by the invention, overcome traditional current limiting system function singleness, shortcoming that utilance is low, at utilization of new energy resources and failure current limit, quality of voltage compensation field, there is good development prospect.
Accompanying drawing explanation
Fig. 1 is the topology diagram of the Multifunction fault current limiting system based on light storage technology;
Fig. 2 is the Multifunction fault current limiting system control principle drawing based on light storage technology.
Embodiment
Below in conjunction with drawings and Examples, further illustrate technical scheme of the present invention.
A Multifunction fault current limiting system based on light storage technology, the present invention is characterised in that, fault current limiting system is connected to PWM current transformer, and PWM current transformer connects respectively photovoltaic generating system, energy-storage system of accumulator; Wherein fault current limiting system is by series transformer, and bidirectional triode thyristor and reactance capacitive filter form; Photovoltaic generating system is comprised of photovoltaic array and boost booster circuit; Energy-storage system of accumulator is comprised of batteries and buck/boost charge-discharge circuit; PWM current transformer is comprised of three-phase H fully controlled bridge.
The boost booster circuit DC bus of photovoltaic generating system of the present invention, energy-storage system of accumulator buck/boost charge-discharge circuit DC bus adopt parallel form to be connected with PWM current transformer DC bus.
The DC bus that parallel form of the present invention connects, its energy storage flat wave capacitor adopts electric capacity connection in series-parallel to connect and realizes, and electric capacity adopts resistance all to press.
Fault current limiting system series transformer secondary side of the present invention adopts star connection, and star mid point is connected to dc-link capacitance mid point.
The control method of a kind of Multifunction fault current limiting system based on light storage technology of the present invention, is characterized in that, controls step as follows:
<1> detects the output voltage U of Photovoltaic array
pvwith output current I
pV, the output voltage reference value of calculating MPPT controller
with photovoltaic array actual value U
pvdeviation, after pi regulator is controlled, modulate, obtain the switching signal of boost circuit, thereby control the output voltage U of Photovoltaic array
pvrealizing MPPT follows the tracks of;
<2> calculates the power output P of Photovoltaic array
pvbe input to PWM current transformer power P
in, work as P
pv>P
intime, battery-operated recharges pattern, k=1; Work as P
pv<P
intime, battery-operated is at discharge mode, k=-1;
The difference of <3> DC-side Voltage Stabilization standard value and actual value adopts PI regulating and controlling, and the instruction after adjusting is as current-order, and actual current is I
bat, instruction current and kI
batdifference adopt PI regulating and controlling, after ovennodulation, obtain the switching signal of buck/boost charge-discharge circuit;
<4> catches voltage-phase, generates the stereotyped command of required each phase voltage compensating to, according to the numerical computations voltage fluctuation compensating instruction of stereotyped command and virtual voltage; Voltage fluctuation compensating instruction and output voltage subtract each other, and obtain the pwm signal of this phase brachium pontis after fixed-frequency hysteresis comparator;
<5>, according to line current judgement short circuit malfunction situation, forms two paths of signals: a road signal blocks fault phase PWM current transformer power device IGBT as block signal when short circuit current surpasses operating value; One road signal is as the conducting control signal of bidirectional triode thyristor, by the conducting of fault phase bidirectional triode thyristor;
<6>, after short trouble is eliminated, first removes the Continuity signal of bidirectional triode thyristor, treats that controllable silicon closes to have no progeny, and recovers the control of fault phase current transformer, removes its block signal.
The above, be only best mode for carrying out the invention, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses, and the simple change of the technical scheme that can obtain apparently or equivalence are replaced and all fallen within the scope of protection of the present invention.
Claims (5)
1. the Multifunction fault current limiting system based on light storage technology, is characterized in that, fault current limiting system is connected to PWM current transformer, and PWM current transformer connects respectively photovoltaic generating system, energy-storage system of accumulator; Wherein fault current limiting system is by series transformer, and bidirectional triode thyristor and reactance capacitive filter form; Photovoltaic generating system is comprised of photovoltaic array and boost booster circuit; Energy-storage system of accumulator is comprised of batteries and buck/boost charge-discharge circuit; PWM current transformer is comprised of three-phase H fully controlled bridge.
2. a kind of Multifunction fault current limiting system based on light storage technology according to claim 1, it is characterized in that, the boost booster circuit DC bus of described photovoltaic generating system, energy-storage system of accumulator buck/boost charge-discharge circuit DC bus adopt parallel form to be connected with PWM current transformer DC bus.
3. a kind of Multifunction fault current limiting system based on light storage technology according to claim 1 and 2, it is characterized in that, the DC bus that described parallel form connects, its energy storage flat wave capacitor adopts electric capacity connection in series-parallel to connect and realizes, and electric capacity adopts resistance all to press.
4. a kind of Multifunction fault current limiting system based on light storage technology according to claim 1, is characterized in that, described fault current limiting system series transformer secondary side adopts star connection, and star mid point is connected to dc-link capacitance mid point.
5. the control method of a kind of Multifunction fault current limiting system based on light storage technology according to claim 1, is characterized in that, controls step as follows:
<1> detects the output voltage U of Photovoltaic array
pvwith output current I
pV, the output voltage reference value of calculating MPPT controller
with photovoltaic array actual value U
pvdeviation, after pi regulator is controlled, modulate, obtain the switching signal of boost circuit, thereby control the output voltage U of Photovoltaic array
pvrealizing MPPT follows the tracks of;
<2> calculates the power output P of Photovoltaic array
pvbe input to PWM current transformer power P
in, work as P
pv>P
intime, battery-operated recharges pattern, k=1; Work as P
pv<P
intime, battery-operated is at discharge mode, k=-1;
The difference of <3> DC-side Voltage Stabilization standard value and actual value adopts PI regulating and controlling, and the instruction after adjusting is as current-order, and actual current is I
bat, instruction current and kI
batdifference adopt PI regulating and controlling, after ovennodulation, obtain the switching signal of buck/boost charge-discharge circuit;
<4> catches voltage-phase, generates the stereotyped command of required each phase voltage compensating to, according to the numerical computations voltage fluctuation compensating instruction of stereotyped command and virtual voltage; Voltage fluctuation compensating instruction and output voltage subtract each other, and obtain the pwm signal of this phase brachium pontis after fixed-frequency hysteresis comparator;
<5>, according to line current judgement short circuit malfunction situation, forms two paths of signals: a road signal blocks fault phase PWM current transformer power device IGBT as block signal when short circuit current surpasses operating value; One road signal is as the conducting control signal of bidirectional triode thyristor, by the conducting of fault phase bidirectional triode thyristor;
<6>, after short trouble is eliminated, first removes the Continuity signal of bidirectional triode thyristor, treats that controllable silicon closes to have no progeny, and recovers the control of fault phase current transformer, removes its block signal.
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|---|---|---|---|
| CN201410168074.6A CN103986136B (en) | 2014-04-24 | 2014-04-24 | A kind of novel and multifunctional fault current limiting system and its control method that technology is stored up based on light |
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|---|---|---|---|
| CN201410168074.6A CN103986136B (en) | 2014-04-24 | 2014-04-24 | A kind of novel and multifunctional fault current limiting system and its control method that technology is stored up based on light |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104410099A (en) * | 2014-11-03 | 2015-03-11 | 深圳市西林电气技术有限公司 | Converter control strategy for multifunctional energy storage system of light storage power station |
| CN104578043A (en) * | 2014-12-22 | 2015-04-29 | 浙江大学 | Power-balance coordination control method for light storage high-permeability direct-current micro-networks |
| CN104638631A (en) * | 2015-03-05 | 2015-05-20 | 中国南方电网有限责任公司 | Direct current amplitude limiting method for direct current solitary island power transmission system |
| CN104734121A (en) * | 2015-04-07 | 2015-06-24 | 国网冀北电力有限公司电力科学研究院 | Current control method and device for off-grid energy storage converter |
| CN104882890A (en) * | 2015-05-28 | 2015-09-02 | 株洲变流技术国家工程研究中心有限公司 | Current limiting type dynamic voltage restorer and uninterrupted power supply method thereof |
| CN106451544A (en) * | 2016-10-25 | 2017-02-22 | 中国科学院广州能源研究所 | Energy-storage combined tri-level grid-connected system control method |
| CN106712090A (en) * | 2017-01-20 | 2017-05-24 | 合肥聚能新能源科技有限公司 | Modular photovoltaic energy-storage inverter |
| CN106972471A (en) * | 2017-04-27 | 2017-07-21 | 国家电网公司 | Multifunctional short circuit demand limiter |
| CN107508463A (en) * | 2017-08-14 | 2017-12-22 | 华为技术有限公司 | Photovoltaic DC converter exports pressure limiting method and device |
| CN107710553A (en) * | 2015-02-19 | 2018-02-16 | 康明斯发电Ip公司 | Energy storage system |
| CN107943106A (en) * | 2017-11-17 | 2018-04-20 | 苏州聚晟太阳能科技股份有限公司 | Possess the MPPT header boxs of following function and its control method of use |
| CN109301872A (en) * | 2018-11-15 | 2019-02-01 | 中国科学院电工研究所 | A method of reducing grid line loss |
| CN110853288A (en) * | 2019-10-16 | 2020-02-28 | 广西电网有限责任公司南宁供电局 | 10kV ground cable channel hidden danger early warning system based on remote monitoring |
| CN113097988A (en) * | 2021-03-30 | 2021-07-09 | 西安交通大学 | Method for restraining direct current fault arc by using passive element |
| WO2023077805A1 (en) * | 2021-11-04 | 2023-05-11 | 浙江艾罗网络能源技术股份有限公司 | Energy storage inverter battery charge and discharge control method, and charge and discharge control circuit |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410099A (en) * | 2014-11-03 | 2015-03-11 | 深圳市西林电气技术有限公司 | Converter control strategy for multifunctional energy storage system of light storage power station |
| CN104578043A (en) * | 2014-12-22 | 2015-04-29 | 浙江大学 | Power-balance coordination control method for light storage high-permeability direct-current micro-networks |
| CN104578043B (en) * | 2014-12-22 | 2016-08-17 | 浙江大学 | A kind of power-balance coordinated regulation method of light storage Thief zone direct-current micro-grid |
| CN107710553A (en) * | 2015-02-19 | 2018-02-16 | 康明斯发电Ip公司 | Energy storage system |
| CN104638631A (en) * | 2015-03-05 | 2015-05-20 | 中国南方电网有限责任公司 | Direct current amplitude limiting method for direct current solitary island power transmission system |
| CN104734121A (en) * | 2015-04-07 | 2015-06-24 | 国网冀北电力有限公司电力科学研究院 | Current control method and device for off-grid energy storage converter |
| CN104734121B (en) * | 2015-04-07 | 2017-09-29 | 国网冀北电力有限公司电力科学研究院 | A kind of current control method and device of off-network type energy accumulation current converter |
| CN104882890A (en) * | 2015-05-28 | 2015-09-02 | 株洲变流技术国家工程研究中心有限公司 | Current limiting type dynamic voltage restorer and uninterrupted power supply method thereof |
| CN106451544B (en) * | 2016-10-25 | 2019-05-24 | 中国科学院广州能源研究所 | A kind of united three level grid-connected system control method of light storage |
| CN106451544A (en) * | 2016-10-25 | 2017-02-22 | 中国科学院广州能源研究所 | Energy-storage combined tri-level grid-connected system control method |
| CN106712090A (en) * | 2017-01-20 | 2017-05-24 | 合肥聚能新能源科技有限公司 | Modular photovoltaic energy-storage inverter |
| CN106972471A (en) * | 2017-04-27 | 2017-07-21 | 国家电网公司 | Multifunctional short circuit demand limiter |
| CN107508463A (en) * | 2017-08-14 | 2017-12-22 | 华为技术有限公司 | Photovoltaic DC converter exports pressure limiting method and device |
| CN107508463B (en) * | 2017-08-14 | 2019-11-05 | 华为技术有限公司 | Photovoltaic DC converter exports pressure limiting method and device |
| CN107943106A (en) * | 2017-11-17 | 2018-04-20 | 苏州聚晟太阳能科技股份有限公司 | Possess the MPPT header boxs of following function and its control method of use |
| CN109301872A (en) * | 2018-11-15 | 2019-02-01 | 中国科学院电工研究所 | A method of reducing grid line loss |
| CN109301872B (en) * | 2018-11-15 | 2021-09-10 | 中国科学院电工研究所 | Method for reducing line loss of power grid |
| CN110853288A (en) * | 2019-10-16 | 2020-02-28 | 广西电网有限责任公司南宁供电局 | 10kV ground cable channel hidden danger early warning system based on remote monitoring |
| CN113097988A (en) * | 2021-03-30 | 2021-07-09 | 西安交通大学 | Method for restraining direct current fault arc by using passive element |
| WO2023077805A1 (en) * | 2021-11-04 | 2023-05-11 | 浙江艾罗网络能源技术股份有限公司 | Energy storage inverter battery charge and discharge control method, and charge and discharge control circuit |
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