CN103094922A - Two-level type single-phase grid-connected photovoltaic power generation control method - Google Patents
Two-level type single-phase grid-connected photovoltaic power generation control method Download PDFInfo
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- CN103094922A CN103094922A CN2013100093158A CN201310009315A CN103094922A CN 103094922 A CN103094922 A CN 103094922A CN 2013100093158 A CN2013100093158 A CN 2013100093158A CN 201310009315 A CN201310009315 A CN 201310009315A CN 103094922 A CN103094922 A CN 103094922A
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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
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- 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
Abstract
The invention discloses a two-level type single-phase grid-connected photovoltaic power generation control method aimed at a grid-connected photovoltaic power generation inverter circuit formed by a BOOST converter, a single-phase inverter circuit and a filter. The BOOST converter has two work modes which are a work mode of a BOOST non-work zone and a work mode of a BOOST work zone. The single-phase inverter circuit achieves the function that high-power-factor harmonic current is injected into a power grid through maximum power point tracing outer-ring control and inverter output current inner-ring control. According to the two-level type single-phase grid-connected photovoltaic power generation control method, the BOOST converter does not work for a part of time within a half power grid power frequency circle, so that switching consumption is avoided, and the power of the whole system is further improved.
Description
Technical field
The invention belongs to solar energy power generating control technology field, relate to the single-phase photovoltaic grid-connected electricity-generating control method of a kind of two-stage type.
Background technology
Solar energy resources is inexhaustible, nexhaustible, and photovoltaic generation obtains fast development as one of generation technology of solar energy utilization.With regard to present technical merit, monolithic photovoltaic battery panel output voltage is lower, needs the polylith photovoltaic battery panel to connect to form the photovoltaic branch road, forms photovoltaic array by identical photovoltaic branch circuit parallel connection.The direct current that photovoltaic array produces just can be converted to alternating current through combining inverter and inject electrical network.Under the prerequisite of identical power output, the raising of combining inverter efficient means can install some photovoltaic battery panels less, thereby reduces the equipment cost of whole photovoltaic generating system.
The inverter circuit efficient of generating electricity by way of merging two or more grid systems is higher, and because the photovoltaic array output voltage is relatively low, therefore adopts BOOST booster converters and the single-phase photovoltaic grid-connected power-generation inversion circuit of single-phase inversion the electric circuit constitute two-stage type more.For above-mentioned two-stage type circuit, when the photovoltaic array output voltage during lower than the electrical network crest voltage, usually way is: take the power switch of BOOST booster converter to work always, control cooperation with the single-phase inversion circuit, in order to guarantee that the output voltage stabilization of BOOST booster converter is at a certain dc voltage value, this dc voltage value will higher than the electrical network crest voltage, its objective is to guarantee that the electric energy that photovoltaic array produces injects electrical network smoothly.The power switch of BOOST booster converter is worked always due to this moment, so the efficient of whole system is affected.
Summary of the invention
The purpose of this invention is to provide the single-phase photovoltaic grid-connected electricity-generating control method of a kind of two-stage type, solved in the prior art power switch of BOOST booster converter always in running order, cause switching loss obviously to increase, the problem that whole system efficient is not fully exerted.
The technical solution adopted in the present invention is, the single-phase photovoltaic grid-connected electricity-generating control method of a kind of two-stage type,
Form a parallel network power generation circuit, comprise the BOOST booster converter that is connected with photovoltaic array, the BOOST booster converter is connected successively with single-phase inversion circuit, filter circuit, and filter circuit is incorporated into the power networks with public electric wire net and is connected,
Utilize above-mentioned parallel network power generation inverter circuit, the single-phase inversion circuit keeps a kind of control mode always, and described BOOST booster converter exists two kinds of mode of operations, the i.e. mode of operation of the mode of operation between the BOOST dead zone and BOOST operation interval:
Mode of operation between described BOOST dead zone referred in the time period of photovoltaic array output voltage values V1 higher than the absolute value of electrical network instantaneous voltage, the power switch of BOOST booster converter is in off state, and this moment, single-phase inversion circuit input direct voltage V2 equaled photovoltaic array output voltage V 1;
The mode of operation of described BOOST operation interval refers to that photovoltaic array output voltage values V1 is not in the time period higher than the absolute value of electrical network instantaneous voltage, the power switch of BOOST booster converter is in opening state, and this moment, single-phase inversion circuit input direct voltage V2 was certain the given magnitude of voltage Vb higher than the electrical network crest voltage.
The invention has the beneficial effects as follows: even the photovoltaic array output voltage is lower than the electrical network crest voltage, the BOOST booster converter also needs the work of always boosting unlike classical control method, but only just carries out boosting rectifier control during not higher than the absolute value of electrical network instantaneous voltage when the photovoltaic array output voltage.Therefore, there is part-time BOOST booster converter not work in half electrical network power frequency period, thereby obviously reduces switching loss, make whole system efficient be further enhanced.
Description of drawings
Fig. 1 is the single-phase photovoltaic grid-connected electricity-generating circuit block diagram of two-stage type that the inventive method relies on;
Fig. 2 is the connection diagram of the single-phase photovoltaic grid-connected electricity-generating circuit embodiment of two-stage type of the present invention;
Fig. 3 is principle explanation oscillogram corresponding to the inventive method;
Fig. 4 is the mode of operation deterministic process block diagram of the inventive method;
Fig. 5 is the control procedure block diagram of BOOST booster converter when the BOOST operation interval of the inventive method;
Fig. 6 is the control principle block diagram of the single-phase inversion circuit in the inventive method.
In figure, 1. photovoltaic array, 2.BOOST booster converter, 3. single-phase inversion circuit, 4. filter circuit, 5. public electric wire net;
In addition, I1 represents the photovoltaic array output current,
V1 represents the photovoltaic array output voltage,
V2 represents single-phase inversion circuit input direct voltage,
I3 represents single-phase inversion circuit output current,
V4 represents public electric wire net voltage,
The reference value of single-phase inversion circuit input direct voltage when constant Vb is the BOOST operation interval,
C1 represents the photovoltaic array output filter capacitor,
C2 represents single-phase inversion circuit input direct-current filter capacitor,
D1 represents the anti-reverse charging power diode,
D2 represents the diode in the BOOST booster converter,
L1 represents the inductance in the BOOST booster converter,
L2 represents the ac filter inductance,
S1-S4 represents four power switchs in the single-phase inversion circuit,
S5 represents the power switch in the BOOST booster converter.
Embodiment
With reference to Fig. 1, it is the block diagram of the parallel network power generation circuit that relies on of the single-phase photovoltaic grid-connected electricity-generating control method of two-stage type of the present invention, its structure is, comprise the BOOST booster converter 2 that is connected with photovoltaic array 1, BOOST booster converter 2 is connected successively with single-phase inversion circuit 3, filter circuit 4, and filter circuit 4 is incorporated into the power networks with public electric wire net 5 and is connected.
Above-mentioned BOOST booster converter 2 is as prime, single-phase inversion circuit 3 is as rear class, the output of BOOST booster converter 2 connects the input of single-phase inversion circuit 3, the output of single-phase inversion circuit 3 connects the input of filter circuit 4, and the output of filter circuit 4 connects the input of public electric wire net 5.
Single-phase inversion circuit 3 is selected the full bridge inverter of classical bipolar pulse width modulated (PWM), or has the various inverter circuits of the single-polarity PWM of common mode current inhibit feature.
With reference to Fig. 2, a kind of embodiment circuit that is the single-phase photovoltaic grid-connected electricity-generating control method of two-stage type of the present invention connects block diagram, BOOST booster converter 2 is selected classical BOOST booster converter, single-phase inversion circuit 3 is selected the full bridge inverter of classical bipolar pulse width modulated (PWM), and filter circuit 4 is selected the L-type filter.
With reference to Fig. 3, it is the corresponding principle explanation of control method embodiment of the present invention oscillogram, interval at 0-t1, t2-t3 is interval, t4-t5 is interval, t6-t7 is interval, t8-t9 interval in, photovoltaic array output voltage values V1 is higher than the absolute value of electrical network instantaneous voltage, its power switch pipe is failure to actuate, so these intervals are all between the dead zone of BOOST booster converter; And interval at t1-t2, t3-t4 is interval, t5-t6 is interval, t7-t8 interval in, photovoltaic array output voltage values V1 is not higher than the absolute value of electrical network instantaneous voltage, its power switch pipe action, so these intervals are all the operation intervals of BOOST booster converter.Between the dead zone for the BOOST booster converter, single-phase inversion circuit input direct voltage V2 equals photovoltaic array output voltage V 1; For the operation interval of BOOST booster converter, single-phase inversion circuit input direct voltage V2 is higher than certain given magnitude of voltage Vb(of electrical network crest voltage 380V for example).Due to line voltage by the power frequency period variation that goes round and begins again, therefore line voltage is through after taking absolute value, always in every half power frequency period exist between two BOOST dead zones and a BOOST operation interval, and between the BOOST dead zone, the BOOST switching loss reduces to 0, obviously reduces with respect to BOOST switching loss under conventional control mode.
The operation principle of the single-phase photovoltaic grid-connected electricity-generating control method of two-stage type of the present invention is:
With reference to Fig. 4, it is the mode of operation judgement block diagram of the single-phase photovoltaic grid-connected electricity-generating control method of two-stage type of the present invention.Line voltage V4 is through taking absolute value computing, obtain the absolute value of line voltage V4, it and photovoltaic array output voltage V 1 compare, and obtain BOOST booster converter mode of operation judged result, and the system that namely draws is between the BOOST dead zone or two kinds of mode of operations of BOOST operation interval.
When system is in mode of operation between the BOOST dead zone, power switch S5 in BOOST booster converter 2 is under an embargo, be in off state always, the output voltage of photovoltaic array 1 is through inductance L 1 and diode D2 in anti-reverse charging power diode D1, photovoltaic array output filter capacitor C1, BOOST booster converter, directly as single-phase inversion circuit input direct voltage V2 at this moment;
when system is in the mode of operation of BOOST operation interval, its control block diagram is with reference to Fig. 5, its inverter circuit input direct voltage reference value constant Vb is as the reference value of single-phase inversion circuit input direct voltage V2, the single-phase inversion circuit input direct voltage V2 of it and actual samples is through subtraction, obtain their error amounts of two, this error amount is through overvoltage PI closed loop control algorithm, process through the pulse width modulation output signal again, the power switch S5 that controls in the BOOST booster converter carries out switch motion, realize that BOOST booster converter output voltage stabilization is at the magnitude of voltage of constant Vb.
No matter the single-phase photovoltaic grid-connected power-generation inversion circuit of two-stage type is in the mode of operation of BOOST operation interval, still be in the mode of operation between the BOOST dead zone, the control mode of single-phase inversion circuit 3 wherein remains unchanged always.
with reference to Fig. 6, the control mode of single-phase inversion circuit 3 is by the sampling to photovoltaic array output current I1 and photovoltaic array output voltage V 1, to draw the reference of single-phase inversion circuit output current amplitude according to the MPPT maximum power point tracking algorithm, line voltage V4 draws the synchronous rotary angle through digital phase-locked loop, the sinusoidal calculations unit of drawing sinusoidal reference signal is carried out at this synchronous rotary angle, single-phase inversion circuit output current amplitude is with reference to carrying out multiplying with the unit sinusoidal reference signal, draw the single-phase inversion circuit with reference to output current, this single-phase inversion circuit output current with reference to output current and reality carries out subtraction, draw current error, this current error is through the current closed-loop control algolithm, draw the pulse width modulation output signal for the S1-S4 power switch of controlling the single-phase inversion circuit, thereby produce the current signal consistent with electric network voltage phase.
Described MPPT maximum power point tracking algorithm can be disturbance observation or other algorithm known.
Described current closed-loop control algolithm can be that dead beat is controlled or other current known algorithms.
In sum, BOOST booster converter 2 determines whether work according to the magnitude relationship of the absolute value of photovoltaic array output voltage and electrical network instantaneous voltage, and the input voltage of single-phase inversion circuit is along with whether the work of BOOST booster converter changes between certain given magnitude of voltage and two magnitudes of voltage of photovoltaic array output voltage respectively.single-phase inversion circuit 3 is always in running order, control by ring in the control of MPPT maximum power point tracking outer shroud and inverter output current the sinusoidal current of completing High Power Factor and inject the electrical network function, the control outer shroud that is it is the MPPT maximum power point tracking algorithm, its output valve is as inversion output reference current amplitude, it and line voltage multiply each other for the synchronous rotary angular unit sine value that basic digital phase-locked loop produces, as inversion output reference current, the difference of the inverter output current of this inversion output reference current and actual feedback is as the input of current closed-loop control algolithm, realize the interior ring control of single-phase inversion circuit.
the essential meaning of the inventive method is, when the photovoltaic array output voltage during lower than the line voltage peak value, controlled by the MPPT maximum power point tracking outer shroud at the single-phase inversion circuit and inverter output current on the basis of ring control, utilize the magnitude relationship of photovoltaic array output voltage and electrical network instantaneous voltage, the BOOST booster converter is in half electrical network power frequency period the time and work, the time and do not work, therefore with classical BOOST booster converter in running order comparing all the time, the switching loss of the BOOST booster converter in the inventive method obviously reduces, the efficient of whole system is promoted significantly, be specially adapted to the photovoltaic array output voltage lower than the single-phase photovoltaic grid-connected electricity-generating circuit of two-stage type in electrical network crest voltage situation.
Claims (2)
1. single-phase photovoltaic grid-connected electricity-generating control method of two-stage type is characterized in that:
Form a parallel network power generation inverter circuit, comprise the BOOST booster converter (2) that is connected with photovoltaic array (1), BOOST booster converter (2) is connected successively with single-phase inversion circuit (3), filter circuit (4), and filter circuit (4) is incorporated into the power networks with public electric wire net (5) and is connected
Utilize above-mentioned parallel network power generation inverter circuit, single-phase inversion circuit (3) keeps a kind of control mode always, and described BOOST booster converter (2) exists two kinds of mode of operations, the i.e. mode of operation of the mode of operation between the BOOST dead zone and BOOST operation interval:
Mode of operation between described BOOST dead zone referred in the time period of photovoltaic array output voltage values V1 higher than the absolute value of electrical network instantaneous voltage, the power switch of BOOST booster converter (2) is in off state, and this moment, single-phase inversion circuit input direct voltage V2 equaled photovoltaic array output voltage V 1;
The mode of operation of described BOOST operation interval refers to that photovoltaic array output voltage values V1 is not in the time period higher than the absolute value of electrical network instantaneous voltage, the power switch of BOOST booster converter (2) is in opening state, and this moment, single-phase inversion circuit input direct voltage V2 was certain the given magnitude of voltage Vb higher than the electrical network crest voltage.
2. the single-phase photovoltaic grid-connected electricity-generating control method of two-stage type according to claim 1 is characterized in that:
the control mode of described single-phase inversion circuit (3) is by the sampling to photovoltaic array output current I1 and photovoltaic array output voltage V 1, to draw the reference of single-phase inversion circuit output current amplitude according to the MPPT maximum power point tracking algorithm, line voltage draws the synchronous rotary angle through digital phase-locked loop, the sinusoidal calculations unit of drawing sinusoidal reference signal is carried out at this synchronous rotary angle, single-phase inversion circuit output current amplitude is with reference to carrying out multiplying with the unit sinusoidal reference signal, draw the single-phase inversion circuit with reference to output current, this single-phase inversion circuit output current I3 with reference to output current and reality carries out subtraction, draw current error, this current error is through the current closed-loop control algolithm, draw the pulse width modulation output signal for the S1-S4 power switch of controlling single-phase inversion circuit (3), thereby produce the current signal consistent with electric network voltage phase.
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| CN103532127A (en) * | 2013-10-29 | 2014-01-22 | 哈尔滨工业大学 | Control method of DC active filter for micro DC-grid |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103532127A (en) * | 2013-10-29 | 2014-01-22 | 哈尔滨工业大学 | Control method of DC active filter for micro DC-grid |
| CN104079007A (en) * | 2014-03-06 | 2014-10-01 | 西安理工大学 | Distributed grid-connected photovoltaic power generation control method for inhibiting overvoltage of low-voltage feeder line |
| CN104079007B (en) * | 2014-03-06 | 2016-08-24 | 西安理工大学 | The distributed photovoltaic of suppression low pressure feeder line overvoltage generates electricity by way of merging two or more grid systems control method |
| CN104953882A (en) * | 2014-03-31 | 2015-09-30 | 株式会社安川电机 | Power converter, power generation system, control apparatus, and power conversion method |
| CN104270022A (en) * | 2014-09-30 | 2015-01-07 | 马鞍山市安工大工业技术研究院有限公司 | Photovoltaic grid connected inversion circuit, switch control circuit and control method |
| CN104270022B (en) * | 2014-09-30 | 2017-02-15 | 马鞍山市安工大工业技术研究院有限公司 | Photovoltaic grid connected inversion circuit, switch control circuit and control method |
| CN106828123A (en) * | 2017-02-10 | 2017-06-13 | 西南交通大学 | The high-speed railway tractive power supply system and control method of a kind of distributed photovoltaic power |
| CN106828123B (en) * | 2017-02-10 | 2023-04-07 | 西南交通大学 | High-speed railway traction power supply system with distributed photovoltaic power supply and control method |
| WO2018206010A1 (en) * | 2017-05-12 | 2018-11-15 | Huawei Technologies Co., Ltd. | Power systems with inverter input voltage control |
| CN110521077A (en) * | 2017-05-12 | 2019-11-29 | 华为技术有限公司 | Power-supply system with inverter input voltage control |
| US10536002B2 (en) | 2017-05-12 | 2020-01-14 | Futurewei Technologies, Inc. | Power systems with inverter input voltage control |
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| CN111740636A (en) * | 2020-06-29 | 2020-10-02 | 国网浙江省电力有限公司温州供电公司 | Bidirectional inverter and remote charging and discharging maintenance system |
| CN114865709A (en) * | 2022-07-07 | 2022-08-05 | 浙江日风电气股份有限公司 | Bus voltage control method, device and medium for single-phase photovoltaic inverter |
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