CN103986136B - A kind of novel and multifunctional fault current limiting system and its control method that technology is stored up based on light - Google Patents
A kind of novel and multifunctional fault current limiting system and its control method that technology is stored up based on light Download PDFInfo
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- CN103986136B CN103986136B CN201410168074.6A CN201410168074A CN103986136B CN 103986136 B CN103986136 B CN 103986136B CN 201410168074 A CN201410168074 A CN 201410168074A CN 103986136 B CN103986136 B CN 103986136B
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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
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of novel and multifunctional fault current limiting system and its control method that technology is stored up based on light, its novel and multifunctional fault current limiter system mainly includes photovoltaic generation, batteries to store energy, PWM converter and failure current limit part.Photovoltaic generation, batteries to store energy and PWM converter general DC busbar, energy are exchanged between three.Fall when line voltage, lifting, the quality of voltage problem of three-phase imbalance when, by PWM converter offset voltage is provided to power network, simultaneously when different types of short trouble occurs for power network, system carries out current limliting by controlling failure current limit part that inductance is sealed in into system.It is a kind of based on light store up technology novel and multifunctional fault current limiting system and its control method can realize using solar energy resources come steady load supply voltage, improve power supply quality, limiting short-circuit current purpose.
Description
Technical field
The invention belongs to electric power and field of new energy technologies, it is related to a kind of novel and multifunctional failure limit based on light storage technology
Streaming system and its control method.
Background technology
With the continuous expansion continued to develop with system scale of modern power systems, the capacity of short circuit of system increases therewith
Plus, short circuit current flow increases in the case of causing failure, the requirement more and more higher to primary equipment capacity.However, a side apparatus system
Make technology and do not obtain pleasurable achievement but, cause the contradiction between both constantly to highlight.Simultaneously with various non-thread
Property, impact and unbalanced load constantly access power network, cause power network current, voltage waveform to be distorted, cause line voltage
The quality of voltage problem such as fall, and thus cause substantial amounts of economic loss to power system and user.
The current limiting technique scheme of existing comparative maturity current-limiting reactor or increase on the line mainly on bus is disconnected
Flow device.Bus series reactance is only capable of realizing the function of failure current limit, due to being serially connected in for a long time in power network, expends a large amount of power,
And the selection of series reactance can not be too big, causes current limitation effect not good, while quality of voltage can not be solved the problems, such as to power network
And the influence of user.
The content of the invention
In order to solve the above-mentioned technical problem, the invention discloses a kind of novel and multifunctional failure current limit that technology is stored up based on light
System and its control method, can not only realize grid short circuit current-limiting function, and can solve voltage swell, temporarily drop and three-phase injustice
The power quality problems such as weighing apparatus problem.Disclosure sets forth the topology knot for the novel and multifunctional fault current limiting system that technology is stored up based on light
Structure and control method.
Technical scheme is as follows：
A kind of novel and multifunctional fault current limiting system that technology is stored up based on light, the invention is characterised in that, by failure current limit system
System connection PWM converter, and PWM converter connects photovoltaic generating system, energy-storage system of accumulator respectively；Wherein failure current limit
System by series transformer, bidirectional triode thyristor and reactive capacitance wave filter group into；Photovoltaic generating system is by photovoltaic array and boost
Booster circuit is constituted；Energy-storage system of accumulator is made up of batteries and buck/boost charge-discharge circuits；PWM converter is by three
Phase H fully controlled bridges are constituted.
Boost booster circuits dc bus, the energy-storage system of accumulator buck/ of photovoltaic generating system of the present invention
Boost charge-discharge circuits dc bus is connected with PWM converter dc bus using parallel form.
The dc bus of parallel form connection of the present invention, its energy storage flat wave capacitor connects real using electric capacity connection in series-parallel
Show, and electric capacity is pressed using resistance.
Fault current limiting system series transformer secondary side of the present invention uses star connection, and star midpoint is connected to directly
Flow bus capacitor midpoint.
A kind of control method of novel and multifunctional fault current limiting system that technology is stored up based on light of the present invention, its feature
It is, rate-determining steps are as follows：
<1>Detect the output voltage U of Photovoltaic arraypvWith output current IPV, calculate the output voltage reference of MPPT controller
ValueWith photovoltaic array actual value UpvDeviation, be modulated after pi regulator control, obtain opening for boost circuits
OFF signal, so as to control the output voltage U of Photovoltaic arraypvRealize that MPPT is tracked；
<2>Calculate the power output P of Photovoltaic arraypvBe input to PWM converter power Pin, work as Ppv>PinWhen, battery
Work recharges pattern, k=1；Work as Ppv<PinWhen, battery-operated is in discharge mode, k=-1；
<3>The difference of DC-side Voltage Stabilization standard value and actual value is controlled to adjust using PI, and the instruction after regulation is used as electricity
Stream instruction, actual current is Ibat, instruction current and kIbatDifference using PI control to adjust, buck/ is obtained after ovennodulation
The switching signal of boost charge-discharge circuits；
<4>Capture voltage-phase, the stereotyped command of each phase voltage compensated required for generation, according to stereotyped command and reality
The numerical computations voltage pulsation compensating instruction of border voltage；Voltage pulsation compensating instruction subtracts each other with output voltage, by fixed-frequency hysteresis
The pwm signal of the phase bridge arm is obtained after comparator；
<5>Judge short circuit malfunction situation according to line current, two-way letter is formed when short circuit current flow exceedes working value
Number：Signal blocks failure phase PWM converter power device IGBT as block signal all the way；Signal is as two-way controllable all the way
The conductivity control signal of silicon, failure phase bidirectional triode thyristor is turned on；
<6>After short trouble is eliminated, the Continuity signal of bidirectional triode thyristor is first removed, after after controllable silicon shut-off, recovers event
Hinder the control of phase current transformer, remove its block signal.
Beneficial effects of the present invention：New many work(fault current limiting systems based on light storage technology and its control that the present invention is provided
Method processed, the short circuit current flow that it can rapidly under suppression system different type short trouble, protection power system and customer charge
Equipment；Current limiting system can compensate for voltage lifting, fall and imbalance of three-phase voltage, improve power system power supply reliability, steady
It is qualitative, improve the supply voltage quality of user side；The DC side power supply that technology provides current limiting system is stored up by light, in voltage compensation
When by after conversion solar energy send into power network, take full advantage of clean energy resource.The present invention provide based on light storage technology
New many work(fault current limiting systems and its control method, overcome traditional shortcoming that current limiting system function is single, utilization rate is low,
There is good development prospect in utilization of new energy resources and failure current limit, quality of voltage compensation field.
Brief description of the drawings
Fig. 1 is the topology diagram of the novel and multifunctional fault current limiting system based on light storage technology；
Fig. 2 is the novel and multifunctional fault current limiting system control principle drawing based on light storage technology.
Embodiment
Technical scheme is further illustrated with reference to the accompanying drawings and examples.
A kind of novel and multifunctional fault current limiting system that technology is stored up based on light, the invention is characterised in that, by failure current limit system
System connection PWM converter, and PWM converter connects photovoltaic generating system, energy-storage system of accumulator respectively；Wherein failure current limit
System by series transformer, bidirectional triode thyristor and reactive capacitance wave filter group into；Photovoltaic generating system is by photovoltaic array and boost
Booster circuit is constituted；Energy-storage system of accumulator is made up of batteries and buck/boost charge-discharge circuits；PWM converter is by three
Phase H fully controlled bridges are constituted.
Boost booster circuits dc bus, the energy-storage system of accumulator buck/ of photovoltaic generating system of the present invention
Boost charge-discharge circuits dc bus is connected with PWM converter dc bus using parallel form.
The dc bus of parallel form connection of the present invention, its energy storage flat wave capacitor connects real using electric capacity connection in series-parallel
Show, and electric capacity is pressed using resistance.
Fault current limiting system series transformer secondary side of the present invention uses star connection, and star midpoint is connected to directly
Flow bus capacitor midpoint.
A kind of control method of novel and multifunctional fault current limiting system that technology is stored up based on light of the present invention, its feature
It is, rate-determining steps are as follows：
<1>Detect the output voltage U of Photovoltaic arraypvWith output current IPV, calculate the output voltage reference of MPPT controller
ValueWith photovoltaic array actual value UpvDeviation, be modulated after pi regulator control, obtain opening for boost circuits
OFF signal, so as to control the output voltage U of Photovoltaic arraypvRealize that MPPT is tracked；
<2>Calculate the power output P of Photovoltaic arraypvBe input to PWM converter power Pin, work as Ppv>PinWhen, battery
Work recharges pattern, k=1；Work as Ppv<PinWhen, battery-operated is in discharge mode, k=-1；
<3>The difference of DC-side Voltage Stabilization standard value and actual value is controlled to adjust using PI, and the instruction after regulation is used as electricity
Stream instruction, actual current is Ibat, instruction current and kIbatDifference using PI control to adjust, buck/ is obtained after ovennodulation
The switching signal of boost charge-discharge circuits；
<4>Capture voltage-phase, the stereotyped command of each phase voltage compensated required for generation, according to stereotyped command and reality
The numerical computations voltage pulsation compensating instruction of border voltage；Voltage pulsation compensating instruction subtracts each other with output voltage, by fixed-frequency hysteresis
The pwm signal of the phase bridge arm is obtained after comparator；
<5>Judge short circuit malfunction situation according to line current, two-way letter is formed when short circuit current flow exceedes working value
Number：Signal blocks failure phase PWM converter power device IGBT as block signal all the way；Signal is as two-way controllable all the way
The conductivity control signal of silicon, failure phase bidirectional triode thyristor is turned on；
<6>After short trouble is eliminated, the Continuity signal of bidirectional triode thyristor is first removed, after after controllable silicon shut-off, recovers event
Hinder the control of phase current transformer, remove its block signal.
It is described above, only best mode for carrying out the invention, any one skilled in the art is in the present invention
In the technical scope of disclosure, the simple change or equivalence replacement of the technical scheme that can be become apparent to each fall within the present invention's
In protection domain.
Claims (4)
1. a kind of novel and multifunctional fault current limiting system that technology is stored up based on light, it is characterised in that connect fault current limiting system
PWM converter, and PWM converter connects photovoltaic generating system, energy-storage system of accumulator respectively；Wherein fault current limiting system by
Series transformer, bidirectional triode thyristor and reactive capacitance wave filter group into；Photovoltaic generating system boosts electric by photovoltaic array and boost
Road is constituted；Energy-storage system of accumulator is made up of batteries and buck/boost charge-discharge circuits；PWM converter is complete by three-phase H
Control bridge composition；
The fault current limiting system series transformer secondary side uses star connection, and star midpoint is connected to the storage being connected in series
Can flat wave capacitor midpoint.
2. a kind of novel and multifunctional fault current limiting system that technology is stored up based on light according to claim 1, it is characterised in that
Boost booster circuits dc bus, the energy-storage system of accumulator buck/boost charge-discharge circuits of the photovoltaic generating system are straight
Stream bus is connected with PWM converter dc bus using parallel form.
3. a kind of novel and multifunctional fault current limiting system that technology is stored up based on light according to claim 2, it is characterised in that
The dc bus of the parallel form connection, its energy storage flat wave capacitor is connected using electric capacity connection in series-parallel and realized, and electric capacity is using electricity
Resistance is pressed.
4. a kind of control method of novel and multifunctional fault current limiting system that technology is stored up based on light according to claim 1,
Characterized in that, rate-determining steps are as follows：
<1>Detect the output voltage U of Photovoltaic arraypvWith output current IPV, calculate the output voltage reference value of MPPT controllerWith the output voltage U of Photovoltaic arraypvDeviation, be modulated after pi regulator control, obtain opening for boost circuits
OFF signal, so as to control the output voltage U of Photovoltaic arraypvRealize that MPPT is tracked；
<2>Calculate the power output P of Photovoltaic arraypvBe input to PWM converter power Pin, work as Ppv＞ PinWhen, battery-operated
Recharge pattern, k=1；Work as Ppv＜ PinWhen, battery-operated is in discharge mode, k=-1；
<3>The difference of DC-side Voltage Stabilization standard value and actual value is controlled to adjust using PI, and the instruction after regulation refers to as electric current
Order, actual current is Ibat, instruction current and kIbatDifference controlled to adjust using PI, after ovennodulation obtaining buck/boost fills
The switching signal of discharge circuit；
<4>Capture voltage-phase, the stereotyped command of each phase voltage compensated required for generation, according to stereotyped command and actual electricity
The numerical computations voltage pulsation compensating instruction of pressure；Voltage pulsation compensating instruction subtracts each other with output voltage, compares by fixed-frequency hysteresis
The pwm signal of the phase bridge arm is obtained after device；
<5>Judge short circuit malfunction situation according to line current, two paths of signals is formed when short circuit current flow exceedes working value：One
Road signal blocks failure phase PWM converter power device IGBT as block signal；Signal is used as bidirectional triode thyristor all the way
Conductivity control signal, failure phase bidirectional triode thyristor is turned on；
<6>After short trouble is eliminated, the Continuity signal of bidirectional triode thyristor is first removed, after after controllable silicon shut-off, recovers failure phase
The control of 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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| 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 |
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| 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 |
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| CN114039371B (en) * | 2021-11-04 | 2023-10-20 | 浙江艾罗网络能源技术股份有限公司 | Charging and discharging control method and charging and discharging control circuit for energy storage inverter battery |
| CN117318126B (en) * | 2023-11-30 | 2024-02-27 | 山东华天电气有限公司 | Micro-grid power quality optimization and energy storage integrated device and control method |
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