CN104009478A - Voltage stabilization system applied to new energy power generation and electric vehicle battery replacement station and control method of voltage stabilization system - Google Patents
Voltage stabilization system applied to new energy power generation and electric vehicle battery replacement station and control method of voltage stabilization system Download PDFInfo
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- CN104009478A CN104009478A CN201410259160.8A CN201410259160A CN104009478A CN 104009478 A CN104009478 A CN 104009478A CN 201410259160 A CN201410259160 A CN 201410259160A CN 104009478 A CN104009478 A CN 104009478A
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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
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Abstract
The invention discloses a voltage stabilization system applied to new energy power generation and electric vehicle battery replacement stations. The voltage stabilization system mainly aims at solving the problem of instability of new energy power generation in a micro grid and guaranteeing stable operation of key loads, so that fluctuation (more than +/- 15%) of input voltages is transferred to non-key loads (such as electric vehicle battery replacement stations). By the adoption of the battery replacement stations, the problem of time consumption in the charging process of electric vehicles can be effectively solved. New energy power generation systems and the electric vehicle battery replacement stations are connected innovatively, a voltage stabilization device serves as a key link, it can be guaranteed that voltages of the key loads are stable, energy supply to the battery replacement stations can be reduced when the generating capacity is small, redundant energy can be supplied to a battery replacement station system when the generating capacity is large, and the defect of instability of regenerative energy power generation is overcome. The voltage stabilization system is high in practical value and easy to popularize, battery replacement stations for electric vehicles can be established at the same time at locations (such as hospitals with the new energy power generation systems) of the key loads.
Description
Technical field
The invention belongs to operation of power networks control and electric automobile charging station technical field, relate to a kind of voltage-stabilizing system and method thereof that is applied to generation of electricity by new energy.
Background technology
Along with the continuous progress of generation of electricity by new energy technology, its grid connection capacity increases just year by year, also more and more obvious on the impact of electric power system, such as fluctuation and the frequency flickering etc. of harmonic pollution, voltage.Large-scale power grid has certain capacity of self-regulation for the fluctuation of voltage, and for small-sized isolated micro-electrical network, the unsteadiness of the renewable energy power generation such as wind energy, solar energy, sometimes can not meet the need for electricity of whole loads, cause the voltage fluctuation of electrical network, this fluctuation meeting produces adverse influence to power consumption equipment, even can damage crucial power consumption equipment.Such as hospital is for the Medical Devices of monitor patients vital signs, very strict to the requirement of input voltage, the voltage fluctuation of super scope will cause the unreliable of equipment operation, can cause erroneous judgement to doctor, may jeopardize patient's life when serious.
For the key loading problem of electrical network, now widely used technology is UPS (Uninterruptible Power System), i.e. uninterrupted power supply.Its groundwork principle is in the time that line voltage is normal, will input electricity after voltage stabilizing for load, charge to its internal battery simultaneously; In the time that mains supply interrupts, the alternating current that UPS converts the electric energy of the storage battery in machine to 220V/50Hz by inverter immediately uses to load; When power failure, UPS also can make PWM rectifier be operated in inverter mode to electrical network conveying capacity, is other electrical appliance power supplies on line.But UPS also has the improved place of being worth, such as: its operating state relies on the switching of change over switch, and handoff procedure can have a negative impact to electrical network and load; UPS mainly for be the situation that line voltage interrupts, do not relate to too much for the line voltage too much situation that rises; Although the inverter output voltage of UPS inside is variable, once but determine, only has a kind of voltage specification, if some load is very strict for the fluctuation range of input voltage in electrical network, some load can be used the voltage input of wide-voltage range, uses UPS must will make according to strict voltage standard cost increase; The more important thing is, the recurrent state of the storage battery of UPS inside in charge and discharge, the number of times that discharges and recharges is more, electric current more senior general greatly shorten its useful life.Stable-pressure device in the present invention can effectively address the above problem, and in the time that line voltage fluctuates within the specific limits, can save energy-storage units.
Electric automobile is the focus of current research, and the automobile that its replacement tradition is obtained power with fossil fuel is also trend of the times.Therefore, the electric energy supplementary question of electric automobile is also following.Similar with gas station, what electric automobile needed is charging station.With regard to current technology, fill once electricity and need to expend many time.At this point, electrical changing station can effectively solve charging problem consuming time.
Summary of the invention
Goal of the invention: for above-mentioned prior art, a kind of voltage-stabilizing system and control method thereof that is applied to generation of electricity by new energy and electric automobile charging station proposed, the fluctuation of line voltage and power thereof can be transferred in non-critical loads, thereby be ensured the voltage stabilization on critical loads; Simultaneously by unnecessary Power supply non-critical loads.
Technical scheme: a kind of voltage-stabilizing system that is applied to generation of electricity by new energy and electric automobile charging station, described grid-connected power generation system output single-phase alternating current, described voltage-stabilizing system comprises a single-phase electricity potential source type inverter module, LC low pass filter and isolating transformer, the AC of described inverter module connects LC low pass filter, one end of the capacitor C of described LC low pass filter is connected with inductance L, the other end of capacitor C is connected with the one end on the former limit of isolating transformer, the other end ground connection on the former limit of described isolating transformer, the input of the secondary connecting electric automobile electrical changing station system of described isolating transformer, the output of described grid-connected power generation system connects one end of common port and the critical loads of described inductance L and capacitor C simultaneously by transmission line, 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 is the single-phase full bridge circuit being made up of first to fourth switching tube of anti-paralleled diode.
As preferred version of the present invention, the direct current of described inverter module input side is via PWM rectification module and electrochemical capacitor C
dcprovide, the input of described PWM rectification module is connected with described grid-connected power generation system output single-phase alternating current, and the output of described PWM rectification module connects the DC side of inverter module, electrochemical capacitor C
dcbe connected in parallel on the output of described PWM rectification module.
Further, described PWM rectification module is the single-phase full bridge circuit being made up of first to fourth switching tube of anti-paralleled diode.
As improvement of the present invention, the input side direct current of described inverter module is to provide via storage battery.
Be applied to the control method of the voltage-stabilizing system of generation of electricity by new energy and electric automobile charging station, adopt two closed-loop controls of voltage, electric current, a control cycle comprises the steps:
1), gather the voltage feedback signal v of critical loads
s_fb, the current value i of inductance L in collection LC low pass filter
l_fb;
2), by described v
s_fbreference sinusoidal quantity v with critical loads in Voltage loop
s_refdo to carry out PR adjusting, the output i of Voltage loop after difference
l_refas the reference value of current inner loop; Calculate described v by vectogram method
s_refphase place: with described isolating transformer original edge voltage
for drawing phasor diagram with reference to phasor, capacitor C both end voltage in described LC low pass filter
described in hysteresis
90 degree,
with
phasor and be described critical loads both end voltage
definition
described in equaling
be multiplied by
described
with
phasor and be the voltage of grid-connected power generation system output single-phase alternating current
according to described vectogram, utilize geometrical relationship to calculate described critical loads both end voltage
with
phase difference δ; Wherein, R
1for grid-connected power generation system outputs to the transmission line equivalent resistance of critical loads, L
1for grid-connected power generation system outputs to the transmission line equivalent inductance of critical loads, Z
2for the impedance of critical loads,
for the electric current through the former limit of isolating transformer;
3), by described i
l_refwith current sampling data i
l_fbthe output valve of difference after P adjuster again after amplitude limit as SPWM modulating wave v
_ ref;
4), by described v
_ refwith triangular carrier WC1 comparison, obtain the driving signal of first to fourth switching tube of described single-phase electricity potential source type inverter module, the fundametal compoment of the ac output end output voltage of control inverter module with described in
the alternating voltage that phase place is identical;
5), in the time that line voltage raises, control described δ and increase, described voltage close loop control makes described v
_ refamplitude reduces, described in
therefore amplitude reduces, described in
amplitude increases; Control procedure in the time that line voltage reduces is contrary.
Beneficial effect: in voltage-stabilizing system of the present invention, for the stable-pressure device being formed by single-phase electricity potential source type inverter module and LC low pass filter in the present invention, inventor has proposed the energy of non-critical loads is made full use of and it and the electrical changing station of electric automobile are connected, by this energy by giving the batteries charging of electric automobile after converter shaping.In critical loads location, such as having used hospital of grid-connected power generation system etc., can set up the electrical changing station system of electric automobile simultaneously.
Compared to the prior art, tool has the following advantages in the present invention:
1, can ensure that key load supplying is stable
In the time that grid power is enough to ensure the loaded power supply of institute, key load and electric automobile charging station load all can normally be worked; When grid power reduces, while being not enough to ensure whole load supplying, can ensure the stable of key load supplying and voltage, the fluctuation of electrical power and voltage is transferred on electric automobile charging station, automatically reduce the power supply of electric automobile charging station; Found out by Fig. 3, in the time that line voltage effective value is normal value 220V, critical loads voltage effective value is 220V, and the input voltage effective value of electrical changing station is about 201V; As can be seen from Figure 4, when line voltage declines 18.3% time, critical loads voltage effective value is 220V, and the input voltage effective value of electrical changing station is about 130V; As can be seen from Figure 5, when line voltage rises 20% time, critical loads voltage is 220V, and the input voltage effective value of electrical changing station is about 220V; From finding out as the simulation result of Fig. 3, Fig. 4, Fig. 5, when line voltage is during lower 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 during higher than reference value, stable-pressure device in ensureing critical loads stable operation by unnecessary electric energy transfer to electrical changing station.Can ensure the stable operation of critical loads, can make again electrical changing station systematic collaboration operation, simulation results show the accuracy of topology of the present invention and control algolithm.
2, voltage-stabilizing system can save energy-storage units
In the time that line voltage fluctuates within the specific limits, the stable-pressure device in the present invention can save energy-storage units, and UPS must connect normally work of energy-storage units.Represent the situation that line voltage raises from Fig. 6 (a) to Fig. 6 (b); Otherwise represent the situation that line voltage declines.Comparison diagram 6 (a) and (b) known, in the time that line voltage raises, the output modulating wave amplitude of closed-loop control reduces, thereby makes stable-pressure device output voltage
amplitude reduces, the input voltage of electrical changing station
raise, ensureing critical loads voltage like this
stable time, make unnecessary energy transfer in electrical changing station system; In the time that line voltage reduces,
increase,
reduce, by reducing power consumption the stablizing with guarantee critical loads voltage of electrical changing station.
3, the control range of voltage-stabilizing system is wider
UPS can only solve voltage interruption, declines or rise to situation very among a small circle, and voltage-stabilizing system in the present invention had both been applicable to said circumstances, is also applicable to the situation that voltage significantly rises simultaneously.
4, the load type of voltage-stabilizing system is more
Once UPS sets output voltage, its magnitude of voltage is single, requires the load of high load and wide-voltage range input as having voltage specification in system concurrently, uses UPS must make cost increase.Stable-pressure device in the present invention can ensure the stable operation of critical loads, also can make load and the critical loads synthetic operation of wide voltage input simultaneously.
5, practicality is high, application prospect is extensive
The present invention connects the be incorporated into the power networks electrical changing station of technology and electric automobile of generation of electricity by new energy, and has formed an operational system, take full advantage of the electric energy of generation of electricity by new energy, and system is simple and reliable, has very high practical value and application prospect.
6, tight with low voltage crossing technical relation
User power utilization equipment if wind power-generating grid-connected current transformer side-looking is done, one of scheme using energy as the problem of solution low voltage crossing of the voltage-stabilizing system in the present invention so.
Brief description of the drawings
Fig. 1 is voltage-stabilizing system structure chart of the present invention;
Fig. 2 is the control block diagram of voltage-stabilizing system of the present invention;
Fig. 3 is the simulation waveform comparison diagram of line voltage of the present invention while being less than reference voltage, is line voltage successively
critical loads voltage
and non-critical loads voltage
simulation waveform;
Fig. 4 is the simulation waveform comparison diagram of line voltage of the present invention while equaling reference voltage, is line voltage successively
critical loads voltage
and non-critical loads voltage
simulation waveform;
Fig. 5 is the simulation waveform comparison diagram of line voltage of the present invention while being greater than reference voltage, is line voltage successively
critical loads voltage
and non-critical loads voltage
simulation waveform;
Fig. 6 is the phasor diagram of steady operation of the present invention.
In figure, each label definition is as follows:
1.1 is single-phase electrical network, 1.2 is the substitutional connection resistance between electrical network and critical loads, 1.3 is circuit equivalent inductance, and 1.4 is critical loads, and 1.5 is PWM rectifier, 1.6 is electrochemical capacitor, 1.7 is stable-pressure device, comprises a single-phase electricity potential source type inverter and a LC low pass filter, and 1.8 is electric automobile charging station system, comprise battery charger and control and protection system, battery pack etc., 1.9 is power frequency isolating transformer; 2.1 is voltage sample coefficient, and 2.2,2.5 is subtracter, and 2.3 is ratio resonant controller, 2.4 is current sample coefficient, 2.6 is proportional controller, and 2.7 is amplitude limiter circuit, and 2.8 is modulation wave signal, 2.9 is carrier signal, 2.10 is switch drive pulse signal, and 2.11 is phase-locked loop, and 2.12 is that the amplitude of Voltage Reference sinusoidal quantity is given, 2.13 is multiplier, the 2.14 reference sinusoidal quantities that are outer voltage.
Embodiment
Below in conjunction with accompanying drawing, the present invention is done further and explained.
As shown in Figure 1, a kind of voltage-stabilizing system that is applied to generation of electricity by new energy and electric automobile charging station, this grid-connected power generation system output single-phase alternating current.This voltage-stabilizing system comprises a single-phase electricity potential source type inverter module, LC low pass filter, isolating transformer, PWM rectification module and an electrochemical capacitor C
dc.LC low pass filter of interchange side joint of inverter module, one end of the capacitor C of LC low pass filter is connected with inductance L, and the other end of capacitor C is connected with the one end on the former limit of isolating transformer.The other end ground connection on this 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 used for to charging batteries of electric automobile.The output of grid-connected power generation system connects one end of common port and the critical loads of inductance L and capacitor C, the other end ground connection of critical loads simultaneously by transmission line.The DC voltage of inverter module obtains via PWM rectification module, and the input of PWM rectification module is connected with single-phase alternating current, and the output of PWM rectification module connects the DC side of inverter module, electrochemical capacitor C
dcbe connected in parallel on the output of PWM rectification module.Wherein, the topological structure of single-phase electricity potential source type inverter module is the single-phase full bridge circuit being made up of first to fourth switching tube of anti-paralleled diode.PWM rectification module is the single-phase full bridge circuit being made up of first to fourth switching tube of anti-paralleled diode.Further, the DC voltage of inverter module also can be obtained by storage battery, and this voltage should be greater than
For easy analysis, when emulation, isolating transformer is considered as to 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 Z
2choose pure resistance 220 Ω, the pure resistance Z of 15 Ω for electrical changing station
3replace, the tandem compound equivalence of 1 Ω and 25mH for power transmission line and line loss, line voltage reference value is 220V/50Hz.Getting switching frequency in inverter is 10kHz, and in electric automobile charging station, the input voltage range of battery charger can be very wide, and the present invention is with reference to the input voltage range of North America illuminating product, and design effective value is 108V～305V.
As shown in Figure 2, voltage-stabilizing system control method, adopts two closed-loop controls of voltage, electric current, and a control cycle comprises the steps:
1), gather critical loads both end voltage value v
s, by this v
sbe multiplied by Voltage Feedback COEFFICIENT K
vfafter=0.01, obtain gathering the voltage feedback signal v of critical loads
s_fb; Gather the current value i of inductance L in LC low pass filter
l, by this i
lbe multiplied by current feedback COEFFICIENT K
ifafter=0.1, obtain i
l_fb;
2), first by above-mentioned v
s_fbreference sinusoidal quantity v with critical loads in Voltage loop
s_refdo to carry out PR adjusting after difference, in the present embodiment, PR is the Proportional coefficient K of outer voltage in regulating
2p=5, quasi-resonance COEFFICIENT K
2r=100, the output i of Voltage loop
l_refas the reference value of current inner loop; Calculate v by vectogram method
s_refphase place as shown in Figure 6: the isolating transformer original edge voltage taking initial phase as 0
for drawing phasor diagram with reference to phasor, capacitor C both end voltage in LC low pass filter
lagging behind should
90 degree,
with
phasor and be critical loads both end voltage
definition
with
phasor and be the voltage of grid-connected power generation system output single-phase alternating current
according to vectogram, utilize geometrical relationship to calculate critical loads Z
2both end voltage
with
phase difference δ.Wherein, v
s_refamplitude be voltage given value, in this example for the set-point of outer voltage is 2.20V/50Hz, and with the phase difference of line voltage be δ, it participates in phase control; Z
1for grid-connected power generation system outputs to the transmission line impedance of critical loads, comprise substitutional connection resistance R
1with circuit equivalent inductance L
1, Z
2for the impedance of critical loads,
for the electric current through the former limit of isolating transformer; Wherein PLL act as pin current
phase place;
3), by above-mentioned i
l_refwith current sampling data i
l_fbthe output valve of difference after P adjuster again after amplitude limit as SPWM modulating wave v
_ ref; Wherein, in P adjuster, be the Proportional coefficient K of current inner loop
1p=10;
4), by above-mentioned v
_ refwith triangular carrier WC1 comparison, obtain switching tube S11, the switching tube S12 of single-phase electricity potential source type inverter module, the driving signal of switching tube S13, switching tube S14: work as v
_ refwhile being greater than WC1, switching tube S11 and switching tube S13 conducting, switching tube S12 and switching tube S14 turn-off; Work as v
_ refwhile being less than WC1, switching tube S12 and switching tube S14 conducting, switching tube S11 and switching tube S13 turn-off; By said process, make inverter module output alternating voltage fundametal compoment with
phase place is identical; Wherein, the frequency of triangular carrier WC1 is 10kHz, and peak-to-peak value is 2V, and driving the Dead Time of signal is 2us; The input voltage of inverter is after PWM rectifier, connect electrochemical capacitor by single-phase line voltage and obtain;
5), in the time that line voltage raises, above-mentioned δ increases, and voltage close loop control makes v
_ refamplitude reduces,
therefore amplitude reduces, therefore
amplitude increases, and the relation of concrete control procedure and each phasor can be with reference to figure 6 (a) and (b), and this strategy is delivered to unnecessary energy in electrical changing station system in having ensured critical loads voltage stable; Control procedure in the time that line voltage reduces is contrary; Then finish the control flow of this control cycle, wait for next control cycle.
The outer voltage that control method of the present invention relates to participates in phase control with reference to the initial phase of sinusoidal quantity, and the computational process of this initial phase is by the analytical method of phasor diagram.The voltage and current of stable-pressure device output is vertical control, and the δ calculating based on Fig. 6 has not only comprised the vertical information of electric current and voltage, has also comprised the control information that ensures critical loads voltage stabilization simultaneously.
The input of electric automobile charging station system is that in the present embodiment, the turn ratio of the former secondary of isolating transformer is 1:1 through isolating transformer conversion, according to the input requirements of battery charger, and can this turn ratio of choose reasonable.Battery charger is designed to move stage by stage, charges respectively, and be aided with overvoltage and overcurrent protection through trickle, constant current, constant voltage and floating pressure.
The foregoing is only preferred embodiments of the present invention; protection scope of the present invention is not limited with above-mentioned execution mode; in every case the equivalence that those of ordinary skill in the art do according to disclosed content is modified or is changed, and all should include in the protection range of recording in claims.Nonessential load is not limited with electric automobile charging station, can be also other loads that allow voltage to fluctuate in a big way such as electric heater, illuminating product.The control method of stable-pressure device in the present invention, can be applied to reactive power compensation association area.
Claims (6)
1. one kind is applied to the voltage-stabilizing system of generation of electricity by new energy and electric automobile charging station, described grid-connected power generation system output single-phase alternating current, it is characterized in that, described voltage-stabilizing system comprises a single-phase electricity potential source type inverter module, LC low pass filter and isolating transformer, the AC of described inverter module connects LC low pass filter, one end of the capacitor C of described LC low pass filter is connected with inductance L, the other end of capacitor C is connected with the one end on the former limit of isolating transformer, the other end ground connection on the former limit of described isolating transformer, the input of the secondary connecting electric automobile electrical changing station system of described isolating transformer, the output of described grid-connected power generation system connects one end of common port and the critical loads of described inductance L and capacitor C simultaneously by transmission line, 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.
2. a kind of voltage-stabilizing system that is applied to generation of electricity by new energy and electric automobile charging station according to claim 1, it is characterized in that, the topological structure of described single-phase electricity potential source type inverter module is the single-phase full bridge circuit being made up of first to fourth switching tube of anti-paralleled diode.
3. a kind of voltage-stabilizing system that is applied to generation of electricity by new energy and electric automobile charging station according to claim 1, is characterized in that, the direct current of described inverter module input side is via PWM rectification module and electrochemical capacitor C
dcprovide, the input of described PWM rectification module is connected with described grid-connected power generation system output single-phase alternating current, and the output of described PWM rectification module connects the DC side of inverter module, electrochemical capacitor C
dcbe connected in parallel on the output of described PWM rectification module.
4. a kind of voltage-stabilizing system that is applied to generation of electricity by new energy and electric automobile charging station according to claim 3, is characterized in that, described PWM rectification module is the single-phase full bridge circuit being made up of first to fourth switching tube of anti-paralleled diode.
5. a kind of voltage-stabilizing system that is applied to generation of electricity by new energy and electric automobile charging station according to claim 1, is characterized in that, the input side direct current of described inverter module is to provide via storage battery.
6. the control method based on the voltage-stabilizing system that is applied to generation of electricity by new energy and electric automobile charging station claimed in claim 2, is characterized in that, adopts two closed-loop controls of voltage, electric current, and a control cycle comprises the steps:
61), gather the voltage feedback signal v of critical loads
s_fb, the current value i of inductance L in collection LC low pass filter
l_fb;
62), by described v
s_fbreference sinusoidal quantity v with critical loads in Voltage loop
s_refdo to carry out PR adjusting, the output i of Voltage loop after difference
l_refas the reference value of current inner loop; Calculate described v by vectogram method
s_refphase place: with described isolating transformer original edge voltage
for drawing phasor diagram with reference to phasor, capacitor C both end voltage in described LC low pass filter
described in hysteresis
90 degree,
with
phasor and be described critical loads both end voltage
definition
described in equaling
be multiplied by
described
with
phasor and be the voltage of grid-connected power generation system output single-phase alternating current
according to described vectogram, utilize geometrical relationship to calculate described critical loads both end voltage
with
phase difference δ; Wherein, R
1for grid-connected power generation system outputs to the transmission line equivalent resistance of critical loads, L
1for grid-connected power generation system outputs to the transmission line equivalent inductance of critical loads, Z
2for the impedance of critical loads,
for the electric current through the former limit of isolating transformer;
63), by described i
l_refwith current sampling data i
l_fbthe output valve of difference after P adjuster again after amplitude limit as SPWM modulating wave v
_ ref;
64), by described v
_ refwith triangular carrier WC1 comparison, obtain the driving signal of first to fourth switching tube of described single-phase electricity potential source type inverter module, the fundametal compoment of the ac output end output voltage of control inverter module with described in
the alternating voltage that phase place is identical;
65), in the time that line voltage raises, control described δ and increase, described voltage close loop control makes described v
_ refamplitude reduces, described in
therefore amplitude reduces, described in
amplitude increases; Control procedure in the time that line voltage reduces is contrary.
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| CN105914745A (en) * | 2016-05-16 | 2016-08-31 | 天津大学 | Operating-range-adjustable voltage-stabilizing structure used for renewable energy power generation system, and control method |
| CN105048453B (en) * | 2015-07-14 | 2017-06-09 | 东南大学 | A kind of electric power spring topology and its control method |
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| CN105048453B (en) * | 2015-07-14 | 2017-06-09 | 东南大学 | A kind of electric power spring topology and its control method |
| CN105140953A (en) * | 2015-07-31 | 2015-12-09 | 上海载物能源科技有限公司 | Microgrid power control system and method based on power sponge technique |
| CN105140953B (en) * | 2015-07-31 | 2017-09-22 | 上海载物能源科技有限公司 | A kind of microgrid power control system and method based on electric power sponge technology |
| CN105914745A (en) * | 2016-05-16 | 2016-08-31 | 天津大学 | Operating-range-adjustable voltage-stabilizing structure used for renewable energy power generation system, and control method |
| CN105914745B (en) * | 2016-05-16 | 2019-08-20 | 天津大学 | Structure of voltage regulation and control method for renewable energy system |
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| CN104009478B (en) | 2016-08-24 |
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