CN104009478B - A kind of it is applied to generation of electricity by new energy and the voltage-stabilizing system of electric automobile charging station and control method thereof - Google Patents
A kind of it is applied to generation of electricity by new energy and the voltage-stabilizing system of electric automobile charging station and control method thereof Download PDFInfo
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- CN104009478B CN104009478B CN201410259160.8A CN201410259160A CN104009478B CN 104009478 B CN104009478 B CN 104009478B CN 201410259160 A CN201410259160 A CN 201410259160A CN 104009478 B CN104009478 B CN 104009478B
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Abstract
The invention discloses a kind of voltage-stabilizing system being applied to generation of electricity by new energy and electric automobile charging station.This voltage-stabilizing system is mainly for the unstability of generation of electricity by new energy in micro-capacitance sensor, in order to ensure the stable operation of critical loads, the fluctuation (such as more than ± 15%) of input voltage is transferred in non-critical loads (such as electric automobile charging station).The thought of electrical changing station can effectively solve the problem that charging electric vehicle is time-consuming, grid-connected power generation system is connected by the present invention innovatively with electric automobile charging station, crucial tie is stable-pressure device, its energy supply that can realize reducing electrical changing station when generated energy is little while can guarantee that critical loads voltage stabilization, when generated energy is many then by unnecessary energy supply electrical changing station system, overcome the instable defect of renewable energy power generation.Practical value of the present invention is high, easy to spread, critical loads location (such as employing the hospital etc. of grid-connected power generation system), can set up the electrical changing station of electric automobile simultaneously.
Description
Technical field
The invention belongs to operation of power networks control and electric automobile charging station technical field, relate to one and be applied to new forms of energy and send out
The voltage-stabilizing system of electricity and method thereof.
Background technology
Continuous progressive along with generation of electricity by new energy technology, its grid connection capacity increases the most year by year, on the impact of power system also
More and more obvious, the fluctuation of such as harmonic pollution, voltage and frequency flickering etc..Large-scale power grid has certain for the fluctuation of voltage
Capacity of self-regulation, and for small-sized isolated micro-capacitance sensor, the instability of the renewable energy power generation such as wind energy, solar energy
Property, sometimes can not meet the need for electricity of whole load, cause the voltage pulsation of electrical network, electrical equipment can be produced by this fluctuation
Adverse influence, even can damage the electrical equipment of key.Such as hospital is for monitoring the Medical Devices of patients ' lives feature, right
The requirement of input voltage is very strict, and it is unreliable that the voltage pulsation of over range will cause that equipment runs, and can cause to doctor
Erroneous judgement, may jeopardize the life of patient time serious.
For the key loading problem of electrical network, now widely used technology is UPS (Uninterruptible
Power System), i.e. uninterrupted power source.Its main operational principle is when line voltage is normal, by electric for input after voltage stabilizing
For load, charge to its internal battery simultaneously；When electrical network power failure, UPS is immediately by the electricity of the battery in machine
The exchange that energy is converted into 220V/50Hz by inverter supplies electricity to load use；During power failure, UPS also can make PWM rectifier work
Carry energy at inverter mode to electrical network, power for other electrical appliances on line.But, UPS also has is worth the place of improvement, than
As: its duty relies on the switching of change-over switch, and electrical network and load can be had a negative impact by handoff procedure；The main pin of UPS
To be the situation interrupted of line voltage, too much situation is risen without reference to too much for line voltage；Inversion within UPS
Although device output voltage is variable, but once it is determined that, then a kind of voltage specification, if some load is for input electricity in electrical network
The fluctuation range of pressure is very strict, and some load then can use the voltage of wide-voltage range to input, and use UPS must be according to
Strict voltage standard and cost will be made to increase；The more important thing is, the battery within UPS is in the circulation of charge and discharge
State, the number of times of discharge and recharge is the most, electric current more senior general is greatly shortened its service life.Stable-pressure device energy efficient solution in the present invention
Certainly the problems referred to above, when line voltage fluctuates within the specific limits, can save energy-storage units.
Electric automobile is the focus of current research, and it replaces traditional automobile obtaining power with fossil fuel is also the general trend of events
Become.Therefore, the electric energy supplementary question of electric automobile is the most following.Similar with gas station, electric automobile is it is desirable that charge
Stand.For current technology, filling once electricity needs to expend many time.With regard to this, it is time-consuming that electrical changing station can effectively solve charging
Problem.
Summary of the invention
Goal of the invention: for above-mentioned prior art, proposes a kind of generation of electricity by new energy and electric automobile charging station of being applied to
Voltage-stabilizing system and control method thereof, it is possible to the fluctuation of line voltage and power thereof is transferred in non-critical loads, thus ensures
Voltage stabilization on critical loads；Simultaneously by unnecessary energy supply non-critical loads.
Technical scheme: a kind of voltage-stabilizing system being applied to generation of electricity by new energy and electric automobile charging station, described new forms of energy are sent out
Electricity system output single-phase alternating current, described voltage-stabilizing system comprises single-phase electricity potential source type inverter module, a LC low pass filtered
Ripple device and isolating transformer；The AC of described inverter module connects LC low pass filter, described LC low pass filter
One end of electric capacity C is connected with inductance L, and the one end on the other end of electric capacity C limit former with isolating transformer is connected, described isolating transformer
The other end ground connection on former limit, the input of the secondary connecting electric automobile electrical changing station system of described isolating transformer, described new energy
The output of source electricity generation system is simultaneously connected with described inductance L and the common port of electric capacity C and critical loads by transmission line of electricity
One end, the other end ground connection of described critical loads, the DC side input dc power of described single-phase electricity potential source type inverter module.
Further, the topological structure of described single-phase electricity potential source type inverter module be by the first of anti-paralleled diode to
The single-phase full bridge circuit that 4th switching tube is constituted.
As the preferred version of the present invention, the direct current of described inverter module input side be via PWM rectification module with
And electrochemical capacitor CdcThere is provided, the input of described PWM rectification module and described grid-connected power generation system output single-phase alternating current phase
Even, the output of described PWM rectification module connects the DC side of inverter module, electrochemical capacitor CdcIt is connected in parallel on described PWM rectification
The output of module.
Further, described PWM rectification module is be made up of first to fourth switching tube of anti-paralleled diode single-phase
Full-bridge circuit.
As the improvement of the present invention, the input side direct current of described inverter module is to provide via battery.
It is applied to the control method of the voltage-stabilizing system of generation of electricity by new energy and electric automobile charging station, uses voltage, electric current
Double-closed-loop control, a control cycle comprises the steps:
1) the voltage feedback signal v of critical loads, is gathereds_fb, gather the current value i of inductance L in LC low pass filterL_fb；
2), by described vs_fbWith reference sinusoidal quantity v of critical loads in Voltage loops_refPR regulation, voltage is carried out after making difference
The output i of ringL_refReference value as current inner loop；Described v is calculated by vector diagram modes_refPhase place: with described isolation become
Depressor original edge voltageFor drawing phasor diagram with reference to phasor, electric capacity C both end voltage in described LC low pass filterDelayed described90 degree,WithPhasor and be described critical loads both end voltageDefinitionEqual to describedIt is multiplied byDescribedWithPhasor and be the electricity of grid-connected power generation system output single-phase alternating current
PressureAccording to described vectogram, geometrical relationship is utilized to calculate described critical loads both end voltageWithPhase difference δ；Its
In, R1The transmission line of electricity equivalent resistance of critical loads, L is exported for grid-connected power generation system1Export for grid-connected power generation system
The transmission line of electricity equivalent inductance of critical loads, Z2For the impedance of critical loads,For the electric current through the former limit of isolating transformer；
3), by described iL_refWith current sampling data iL_fbDifference output valve conduct after amplitude limit again after P adjuster
SPWM modulating wave v_ref；
4), by described v_refCompare with triangular carrier WC1, obtain the first of described single-phase electricity potential source type inverter module to
The driving signal of the 4th switching tube, controls the fundametal compoment of ac output end output voltage of inverter module with describedPhase
The alternating voltage that position is identical；
5), when line voltage raises, controlling described δ and increase, described voltage close loop controls to make described v_refAmplitude subtracts
Little, describedTherefore amplitude reduces, describedAmplitude increases；Control process when line voltage reduces is contrary.
Beneficial effect: in the voltage-stabilizing system of the present invention, in the present invention by single-phase electricity potential source type inverter module and LC
The stable-pressure device that low pass filter is constituted, inventor proposes and is made full use of by the energy of non-critical loads and by it and electronic vapour
The electrical changing station of car connects, and is charged by the battery pack giving electric automobile after converter shaping by this energy.At critical loads
Location, such as employs the hospital etc. of grid-connected power generation system, can set up the electrical changing station system of electric automobile simultaneously.
Compared to the prior art the present invention, has the advantage that
1, can ensure that key load supplying is stable
When grid power is enough to ensure that the loaded power supply of institute, key load and electric automobile charging station load
Normal work；When grid power reduces, when being not sufficient to ensure that whole load supplying, it is ensured that key load supplying and voltage
Stablize, the fluctuation of electrical power and voltage is transferred on electric automobile charging station, automatically reduces electric automobile charging station
Power supply；Being found out by Fig. 3, when line voltage virtual value is normal value 220V, critical loads voltage effective value is 220V, electrical changing station
Input voltage virtual value be about 201V；As can be seen from Figure 4, when line voltage declines 18.3%, critical loads voltage effective value
For 220V, the input voltage virtual value of electrical changing station is about 130V；As can be seen from Figure 5, when line voltage rises 20%, critical loads
Voltage is 220V, and the input voltage virtual value of electrical changing station is about 220V；From as Fig. 3, Fig. 4, Fig. 5 simulation result it can be seen that
When line voltage is less than reference value, stable-pressure device ensures the stable operation of critical loads by reducing the power consumption of electrical changing station；
When line voltage is higher than reference value, unnecessary electric energy transfer is arrived while ensureing critical loads stable operation by stable-pressure device
On electrical changing station.Both can guarantee that the stable operation of critical loads, and electrical changing station systematic collaboration can have been made again to run, simulation results show
The topology of the present invention and the accuracy of control algolithm.
2, voltage-stabilizing system can save energy-storage units
When line voltage fluctuates within the specific limits, the stable-pressure device in the present invention can save energy-storage units, and UPS must
Energy-storage units must be connected could normally work.The situation that line voltage raises is represented from Fig. 6 (a) to Fig. 6 (b)；Otherwise represent electricity
The situation that net voltage declines.Comparison diagram 6 (a) and (b) understand, when line voltage raises, and the output modulation wave amplitude of closed-loop control
Degree reduces, so that stable-pressure device output voltageAmplitude reduces, the input voltage of electrical changing stationRaise, so ensureing
Critical loads voltageUnnecessary energy is made to transfer in electrical changing station system while Wen Ding；When line voltage reduces,Increase,Reduce, by reducing the power consumption of electrical changing station to ensure stablizing of critical loads voltage.
3, the control range of voltage-stabilizing system is wider
UPS can only solve voltage interruption, the down or up situation to the least scope, and the voltage-stabilizing system in the present invention was both
It is applicable to said circumstances, is simultaneously applicable to the situation that voltage significantly rises.
4, the load type of voltage-stabilizing system is more
UPS once sets output voltage, and its magnitude of voltage is single, requires high load as having voltage specification in system concurrently
And the load of wide-voltage range input, use UPS necessarily to make cost increase.Stable-pressure device in the present invention both can guarantee that pass
The stable operation of key load, simultaneously it is also possible that the load of Width funtion input and critical loads synthetic operation.
5, practicality is high, application prospect is extensive
The electrical changing station of new energy power generation grid-connection running technology with electric automobile is connected by the present invention, and defines one
Operation system, takes full advantage of the electric energy of generation of electricity by new energy, and system is simple and reliable, before having the highest practical value and application
Scape.
6 is tight with low voltage crossing technical relation
If if wind power-generating grid-connected current transformer side is considered as user power utilization equipment, then the voltage-stabilizing system in the present invention
Using energy as one of scheme of problem solving low voltage crossing.
Accompanying drawing explanation
Fig. 1 is the voltage-stabilizing system structure chart of the present invention；
Fig. 2 is the control block diagram of the voltage-stabilizing system of the present invention；
Fig. 3 be the present invention line voltage less than reference voltage time simulation waveform comparison diagram, be line voltage successivelyCritical loads voltageAnd non-critical loads voltageSimulation waveform；
Fig. 4 be the present invention line voltage equal to reference voltage time simulation waveform comparison diagram, be line voltage successivelyCritical loads voltageAnd non-critical loads voltageSimulation waveform；
Fig. 5 be the present invention line voltage more than reference voltage time simulation waveform comparison diagram, be line voltage successivelyCritical loads voltageAnd non-critical loads voltageSimulation waveform；
Fig. 6 is the phasor diagram of steady-state operation of the present invention.
In figure, each label definition is as follows:
1.1 is single-phase electrical network, and 1.2 is the substitutional connection resistance between electrical network and critical loads, and 1.3 is line equivalent electricity
Sense, 1.4 is critical loads, and 1.5 is PWM rectifier, and 1.6 is electrochemical capacitor, and 1.7 is stable-pressure device, including a single-phase voltage
Source type inverter and a LC low pass filter, 1.8 is electric automobile charging station system, including battery charger and control and guarantor
Protecting system, battery pack etc., 1.9 is power frequency isolation transformer；2.1 is voltage sample coefficient, and 2.2,2.5 is subtracter, 2.3 be than
Example resonant controller, 2.4 is current sample coefficient, and 2.6 is proportional controller, and 2.7 is amplitude limiter circuit, and 2.8 is modulation wave signal,
2.9 is carrier signal, and 2.10 is switch drive pulse signal, and 2.11 is phaselocked loop, and 2.12 is the amplitude of Voltage Reference sinusoidal quantity
Given, 2.13 is multiplier, and 2.14 is the reference sinusoidal quantity of outer voltage.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is done and further explain.
As it is shown in figure 1, a kind of voltage-stabilizing system being applied to generation of electricity by new energy and electric automobile charging station, this generation of electricity by new energy
System output single-phase alternating current.This voltage-stabilizing system comprise a single-phase electricity potential source type inverter module, LC low pass filter,
Isolating transformer, PWM rectification module and electrochemical capacitor Cdc.One LC low pass filter of the exchange side joint of inverter module, LC
One end of the electric capacity C of low pass filter is connected with inductance L, and the one end on the other end of electric capacity C limit former with isolating transformer is connected.Should
The other end ground connection on the former limit of isolating transformer, the input of the electrical changing station system of the secondary connecting electric automobile of isolating transformer,
Electrical changing station is for charging batteries of electric automobile.The output of grid-connected power generation system is simultaneously connected with inductance L by transmission line of electricity
With common port and one end of critical loads of electric capacity C, the other end ground connection of critical loads.The DC voltage of inverter module
Obtaining via PWM rectification module, the input of PWM rectification module is electrically connected with single phase ac, and the output of PWM rectification module is even
Meet the DC side of inverter module, electrochemical capacitor CdcIt is connected in parallel on the output of PWM rectification module.Wherein, single-phase electricity potential source type is inverse
The topological structure becoming device module is the single-phase full bridge circuit being made up of first to fourth switching tube of anti-paralleled diode.PWM is whole
Flow module is the single-phase full bridge circuit being made up of first to fourth switching tube of anti-paralleled diode.Further, inverter mould
The DC voltage of block also can be obtained by battery, and this voltage should be greater than
For easy analysis, isolating transformer being considered as during emulation ideal transformer, electrical changing station is equivalent to a pure resistance.
Wherein, the DC voltage of inverter circuit is 400V；LC filtering parameter is respectively 7mH and 100uF；Critical loads Z2Choose pure electricity
Hinder 220 Ω, the electrical changing station pure resistance Z of 15 Ω3Replace, power transmission line and the line loss tandem compound equivalence of 1 Ω and 25mH,
Grid voltage reference value is 220V/50Hz.Taking inverter breaker in middle frequency is 10kHz, battery charging in electric automobile charging station
The input voltage range of device can be the widest, and the present invention is with reference to the input voltage range of North America illuminating product, and being designed with valid value is
108V～305V.
As in figure 2 it is shown, voltage-stabilizing system control method, using voltage, the double-closed-loop control of electric current, a control cycle includes
Following steps:
1), critical loads both end voltage value v is gathereds, by this vsIt is multiplied by voltage feedback factor KvfGathered after=0.01
The voltage feedback signal v of critical loadss_fb；Gather the current value i of inductance L in LC low pass filterL, by this iLIt is multiplied by electric current anti-
Feedforward coefficient KifI is obtained after=0.1L_fb；
2), first by above-mentioned vs_fbWith reference sinusoidal quantity v of critical loads in Voltage loops_refPR regulation is carried out after making difference,
In the present embodiment, it is the Proportional coefficient K of outer voltage during PR regulates2p=5, quasi-resonance COEFFICIENT K2r=100, Voltage loop defeated
Go out iL_refReference value as current inner loop；V is calculated by vector diagram modes_refPhase place as shown in Figure 6: with initial phase for 0
Isolating transformer original edge voltageFor drawing phasor diagram with reference to phasor, electric capacity C both end voltage in LC low pass filterDelayed
Should90 degree,WithPhasor and be critical loads both end voltageDefinition WithPhasor and be the voltage of grid-connected power generation system output single-phase alternating currentAccording to vectogram, utilize several
What relation calculates critical loads Z2Both end voltageWithPhase difference δ,.Wherein, vs_refAmplitude be voltage set-point, this example
In be 2.20V/50Hz for the set-point of outer voltage, and be δ with the phase difference of line voltage, it participates in phase controlling；Z1For
Grid-connected power generation system exports the transmission line of electricity impedance of critical loads, including substitutional connection resistance R1With line equivalent inductance L1,
Z2For the impedance of critical loads,For the electric current through the former limit of isolating transformer；Wherein PLL act as pin currentPhase
Position；
3), by above-mentioned iL_refWith current sampling data iL_fbDifference output valve conduct after amplitude limit again after P adjuster
SPWM modulating wave v_ref；Wherein, the Proportional coefficient K of i.e. current inner loop in P adjuster1p=10；
4), by above-mentioned v_refCompare with triangular carrier WC1, obtain single-phase electricity potential source type inverter module switching tube S11,
Switching tube S12, switching tube S13, the driving signal of switching tube S14: work as v_refDuring more than WC1, switching tube S11 and switching tube S13
Conducting, switching tube S12 and switching tube S14 turn off；Work as v_refDuring less than WC1, switching tube S12 and switching tube S14 conducting, switching tube
S11 and switching tube S13 turns off；Pass through said process so that inverter module output alternating voltage fundametal compoment withPhase
Position is identical；Wherein, the frequency of triangular carrier WC1 is 10kHz, and peak-to-peak value is 2V, and the Dead Time driving signal is 2us；Inversion
The input voltage of device is to be followed by electrochemical capacitor by single-phase mains voltage through PWM rectifier and obtain；
5), when line voltage raises, above-mentioned δ increases, and voltage close loop controls to make v_refAmplitude reduces,Amplitude because of
This reduces, thereforeAmplitude increases, and the relation of concrete control process and each phasor refers to Fig. 6 (a) and (b), and this strategy is ensureing
Critical loads voltage stable while unnecessary energy is delivered in electrical changing station system；Control when line voltage reduces
Process processed is contrary；Then terminate the control flow in this secondary control cycle, wait next control cycle.
The outer voltage that the control method of the present invention relates to participates in phase controlling, this first phase with reference to the initial phase of sinusoidal quantity
The calculating process of position by means of the analysis method of phasor diagram.The voltage and current of stable-pressure device output is vertical control, based on
The calculated δ of Fig. 6 not only contains the information that voltage x current is vertical, also contains simultaneously and ensures critical loads voltage stabilization
Control information.
The input of electric automobile charging station system is to convert through isolating transformer, and in the present embodiment, isolating transformer is former
The turn ratio of secondary is 1:1, according to the input requirements of battery charger, can rationally select this turn ratio.Battery charger is designed as
Run stage by stage, respectively through trickle, constant current, constant voltage and floating pressure charging, and be aided with overvoltage and overcurrent protection.
The foregoing is only the better embodiment of the present invention, protection scope of the present invention with above-mentioned embodiment is not
Limit, as long as those of ordinary skill in the art modify or change according to the equivalence that disclosed content is made, all should include power in
In profit protection domain described in claim.Nonessential load is not limited with electric automobile charging station, it is also possible to be electrical heating
The load that other permission voltages such as device, illuminating product fluctuate in a big way.The control method of stable-pressure device in the present invention, can
To be applied to reactive-load compensation association area.
Claims (6)
1. being applied to a voltage-stabilizing system for generation of electricity by new energy and electric automobile charging station, grid-connected power generation system output single-phase is handed over
Stream electricity, it is characterised in that described voltage-stabilizing system comprise a single-phase electricity potential source type inverter module, LC low pass filter with
And isolating transformer；The AC of described inverter module connects LC low pass filter, the electric capacity C's of described LC low pass filter
One end is connected with inductance L, and the one end on the other end of electric capacity C limit former with isolating transformer is connected, the former limit of described isolating transformer
Other end ground connection, the input of the secondary connecting electric automobile electrical changing station system of described isolating transformer, described generation of electricity by new energy
The output of system is simultaneously connected with described inductance L and the common port of electric capacity C and one end of critical loads, institute by transmission line of electricity
State the other end ground connection of critical loads, the DC side input dc power of described single-phase electricity potential source type inverter module.
A kind of voltage-stabilizing system being applied to generation of electricity by new energy and electric automobile charging station, its feature
Being, the topological structure of described single-phase electricity potential source type inverter module is by first to fourth switching tube structure of anti-paralleled diode
The single-phase full bridge circuit become.
A kind of voltage-stabilizing system being applied to generation of electricity by new energy and electric automobile charging station, its feature
Being, the direct current of described inverter module input side is via PWM rectification module and electrochemical capacitor CdcThere is provided, described PWM
The input of rectification module is connected with described grid-connected power generation system output single-phase alternating current, the output of described PWM rectification module
End connects the DC side of inverter module, electrochemical capacitor CdcIt is connected in parallel on the output of described PWM rectification module.
A kind of voltage-stabilizing system being applied to generation of electricity by new energy and electric automobile charging station, its feature
Being, described PWM rectification module is the single-phase full bridge circuit being made up of first to fourth switching tube of anti-paralleled diode.
A kind of voltage-stabilizing system being applied to generation of electricity by new energy and electric automobile charging station, its feature
Being, the input side direct current of described inverter module is to provide via battery.
The controlling party of the voltage-stabilizing system being applied to generation of electricity by new energy and electric automobile charging station the most according to claim 2
Method, it is characterised in that use voltage, the double-closed-loop control of electric current, a control cycle comprises the steps:
61) the voltage feedback signal v of critical loads, is gathereds_fb, gather the current value i of inductance L in LC low pass filterL_fb；
62), by described vs_fbWith reference sinusoidal quantity v of critical loads in Voltage loops_refPR regulation is carried out after making difference, Voltage loop
Output iL_refReference value as current inner loop；Described v is calculated by vector diagram modes_refPhase place: with described isolating transformer
Original edge voltageFor drawing vectogram with reference to phasor, electric capacity C both end voltage in described LC low pass filterDelayed described90
Degree,WithPhasor and be described critical loads both end voltageDefinitionEqual to describedIt is multiplied by
DescribedWithPhasor and be the voltage of grid-connected power generation system output single-phase alternating currentAccording to described
Vectogram, utilizes geometrical relationship to calculate described critical loads both end voltageWithPhase difference δ；Wherein, R1Send out for new forms of energy
Electricity system exports the transmission line of electricity equivalent resistance of critical loads, L1The transmission of electricity of critical loads is exported for grid-connected power generation system
Line equivalent inductance, Z2For the impedance of critical loads,For the electric current through the former limit of isolating transformer；J is imaginary unit, and ω is
Angular frequency；
63), by described iL_refWith current sampling data iL_fbDifference output valve after P adjuster again after amplitude limit as SPWM
Modulating wave v_ref；
64), by described v_refCompare with triangular carrier WC1, obtain the first to of described single-phase electricity potential source type inverter module
The driving signal of four switching tubes, controls the fundametal compoment of ac output end output voltage of inverter module with describedPhase place
Identical alternating voltage；
65), when line voltage raises, controlling described δ and increase, described voltage close loop controls to make described v_refAmplitude reduces,
DescribedTherefore amplitude reduces, describedAmplitude increases；Control process when line voltage reduces is contrary.
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| KR100774023B1 (en) * | 2004-10-13 | 2007-11-08 | 이화전기공업 주식회사 | Uninterruptible Power Supplies using four-leg inverter and method thereof |
| CN101895206A (en) * | 2010-06-02 | 2010-11-24 | 北京惠特优宝机电有限公司 | Alternating current voltage-regulating and voltage-stabilizing device controlled by insulated gate bipolar transistor |
| CN203423531U (en) * | 2013-09-04 | 2014-02-05 | 厦门多科莫太阳能科技有限公司 | Photoelectric building micro electrical network management system |
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2014
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