CN1835332A - Photovoltaic converter with functions of disconnecting net, connecting net, charging control and regulating power - Google Patents
Photovoltaic converter with functions of disconnecting net, connecting net, charging control and regulating power Download PDFInfo
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- CN1835332A CN1835332A CNA2006100391091A CN200610039109A CN1835332A CN 1835332 A CN1835332 A CN 1835332A CN A2006100391091 A CNA2006100391091 A CN A2006100391091A CN 200610039109 A CN200610039109 A CN 200610039109A CN 1835332 A CN1835332 A CN 1835332A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
Characters of light-volt converter assembly are that through switch circuit, outputs from array of solar cell and accumulator are connected to DC bus respectively or simultaneously; setting up electronic power switch of inverter circuit, control mode for the power switch by DSP being as SPWM; through reactance L, insulated transform by transformer and contactor, the output of inversion is merged into power network; soft starting power resistors are connected to two sides of contactor; based on wattless and harmonic components in load current, DSP control unit generates wattless component of current to be merged in order to compensate wattless and harmonic currents needed by load. Prolonging service life of accumulator and not adding additional equipment, the invention provides compensation of wattless, and active filtering function, is suitable node of merged network located at end of power network, and applicable to distributed type power generation system off/on-network.
Description
Technical field:
The present invention relates to a kind of control device that is applied in the solar photovoltaic grid-connection generating.
Background technology:
Along with economic development, population increases, and energy resource consumption increases fast, brings significant problems such as energy shortage, environmental pollution, ecological degeneration.Solar energy power generating is the emphasis that various countries competitively develop.It is the only way that photovoltaic enters large-scale application that photovoltaic system is incorporated into the power networks, and the photovoltaic grid-connected inversion controller is the key equipment of photovoltaic parallel in system.From document and the patent of publishing, existing photovoltaic grid-connected inversion controller only can become the dc inverter of photovoltaic array alternating current to be fed to conventional electrical network, but can not realize being incorporated into the power networks, accumulator cell charging and discharging and the power adjustments (comprising meritorious and idle) and the integrated controlled function of reactive power compensation of presenting electric energy, so can not be used for reliability requirement higher from net/grid type distributed generation system.
Summary of the invention:
The present invention is for avoiding above-mentioned existing in prior technology weak point, provide a kind of can be from the photovoltaic convertor assembly of possessing of net/be incorporated into the power networks, charge control and power adjustments from net/be incorporated into the power networks, charge control and power adjustments function, design feature at conventional grid-connected photovoltaic system inverter main circuit, when electric network fault, can power to area load from network operation; Proposition combines reactive power compensation with parallel network power generation, thereby saves equipment investment, improves the power supply quality of electrical network simultaneously.
The technical scheme that technical solution problem of the present invention is adopted is:
Design feature of the present invention is:
The output of solar cell array and storage battery inserts dc bus via commutation circuit, and array output end is serially connected with the counnter attack diode, and storage battery output is by diode, power resistor and the contactor bus that inserts in parallel;
Adopt the DSP control unit, setting is by the IGBT power electronic switching T1～T6 of described DSP control unit control, described power electronic switching T1～T6 is connected in the output loop after the three phase full bridge inverter circuit is arranged on array serial connection diode, and described DSP control unit is Sine Wave Pulse Width Modulation SPWM for the control mode of power electronic switching T1～T6;
By the transformer isolation conversion, KM2's inversion outlet side is connected to the grid by contactor through reactance L, and both sides, KM2 contact also are connected to soft start power resistor R2;
Electrical network load-side after the node that is incorporated into the power networks adopts the Hall current instrument transformer, detects idle and harmonic component in the load current, produces the grid-connected current idle component by the DSP control unit according to this, with the required idle and harmonic current of compensating load.
Design feature of the present invention also is: contactor KM3 is set between described inverter circuit and electrical network; With the open circuit voltage of described solar cell array and power output as the detectable signal of judging day and night.
Compare with the active electric current filtering technique with the photovoltaic grid-connected inversion technology, beneficial effect of the present invention is embodied in:
1, the present invention is a series connection counnter attack diode in the output loop of solar cell array, and when the voltage that can prevent the solar cell at night was zero, city's electrical network was to the solar cell array reverse charge;
2, the present invention with insulated gate bipolar transistor npn npn IGBT with good characteristics such as switching loss are low, operating frequency is high, the safety operation area is wide as power electronic switching, with described power electronic switching T1～T6 be connected into the three phase full bridge inverter circuit can realize direct current ← → two-way flow of AC energy;
3, in the output loop of the present invention with described three phase full bridge inverter circuit Industrial Frequency Transformer is set, can realizes the isolation of alternating voltage coupling and solar cell array and city's electrical network;
4, the present invention with described detection load current idle and harmonic component control mode, be an open-loop compensation mode, help the stability of system control;
5, the present invention, can make system accurately judge to be in and generate electricity by way of merging two or more grid systems simultaneously and reactive power compensation state or only be in the reactive power compensation state as the detectable signal of judging day and night with the open circuit voltage of solar cell array and power output;
6, the present invention can be reverse into the energy of accumulators store the 380V/50Hz alternating current when electric network fault, continue to give the power supply of the AC load in the zone, realize system reliably from network operation, realize the backup power function;
7, the present invention is when battery tension is lower than charge initiation voltage, by electrical network (evening) or electrical network and array (daytime) or array multiple charging modes such as (electric network faults) storage battery is charged, the high-efficiency reliable energy management of realization system can utilize the energy effectively, fully and not increase additional hardware;
8, the present invention carries out floating charge with electrical network to storage battery, can reduce the pollution of device to electrical network greatly, and can prolong the life-span of storage battery.
Description of drawings:
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 (a) for the load reactive current be 0 o'clock (be i
a=0), grid-connected power governor output current i
Ca(effective value 8.23A0 and electrical network phase voltage e
aWaveform relationship.
Fig. 2 (b) sends out idle (the hysteresis e of perception for reacance generator
a90 °) time, load current i
a(effective value 8.37A) and grid-connected power governor output current i
Ca(effective value 11.6A) waveform, i
CaLeading i
aAbout 43 °
Fig. 3 is grid-connected current and grid voltage waveform.
Fig. 4 is net side charging current and line voltage synchronization waveform.
When the inversion of Fig. 5 independence is unloaded, the inverter voltage waveform that detects on the control board.
Below by embodiment the present invention is further described:
Embodiment:
Referring to Fig. 1, present embodiment adopts the DSP control unit, and setting is by the IGBT power electronic switching T1～T6 of DSP control unit control, power electronic switching T1～T6 is connected into the three phase full bridge inverter circuit and is arranged in the output loop of solar cell array, and the DSP control unit is Sine Wave Pulse Width Modulation SPWM for the control mode of power electronic switching T1～T6.
Shown in Figure 1, the circuit setting in the present embodiment also comprises:
Series connection counnter attack diode D1 in the output loop of solar cell array.At night; the solar cell array open circuit voltage is zero; can not provide function to city's electrical network; and grid-connected power governor also needs compensating load idle; for keeping the operate as normal of inversion bridge circuit; the bus direct voltage must reach certain value, and counnter attack diode D1 can prevent that described bus direct voltage is added on the voltage both positive and negative polarity that solar cell array draws, the protection solar panel.
Interchange output series reactor L at the three phase full bridge inverter circuit is connected with Industrial Frequency Transformer again.Reactor L effect is to connect electrical network and level and smooth grid-connected current, and the choice relation of its parameter is to the error ripple amplitude of grid-connected current waveform and the effective range of follow current.
In grid-connected power governor AC side serial connection soft start resistance R 2, on the resistance and meet A.C. contactor KM2.Before the plug-in strip closure that between grid-connected power governor and city's electrical network, is connected, A.C. contactor KM2 is in normally open, behind the combined floodgate, utility grid voltage is charged to dc bus capacitor by the three phase full bridge inverter circuit through soft start resistance R 2, when DSP detects dc voltage and reaches certain value, control A.C. contactor KM2 closure, short circuit soft start resistance R 2.Soft start resistance R 2 is when preventing night, because dc capacitor voltage is zero, directly combined floodgate can cause big impulse current.
In concrete the enforcement, the be incorporated into the power networks size of active power of the operating voltage of solar cell array and output current decision also has solar cell array maximal power tracing function, and making the power that generates electricity by way of merging two or more grid systems is the peak power output of solar cell array; The size of decision of idle and harmonic content and network reactive power in the load current, the synthetic and Power Conversion through overpower, the output energy of grid-connected power governor is incorporated city's electrical network into, form generate electricity by way of merging two or more grid systems, unified control that reactive power compensation and harmonic wave suppress.
Concrete enforcement:
Reactive load is the special-purpose active reacance generator SVG of 30KVA of experiment.
Fig. 2 (a) for the load reactive current be 0 o'clock (be i
a=0), grid-connected power governor output current i
Ca(effective value 8.23A) and electrical network phase voltage e
aWaveform relationship, e wherein
aBe the output signal of the voltage sampling circuit on the control board, i
CaWith e
aSame-phase, system is in the state of generating electricity by way of merging two or more grid systems.
Fig. 2 (b) sends out idle (the hysteresis e of perception for reacance generator
a90 °) time, load current i
a(effective value 8.37A) and grid-connected power governor output current i
Ca(effective value 11.6A) waveform, i
CaLeading i
aAbout 43 °, system is in generates electricity by way of merging two or more grid systems and the reactive power compensation state.
By Fig. 2 (a) and Fig. 2 (b) as can be known, before reactive load put into operation, the electric current of grid-connected power governor output was entirely meritorious; After reactive load puts into operation, comprised reactive current in the grid-connected current of grid-connected power governor, its phase place and amplitude all change, and power network current i
SaChange not quite before and after reactive load drops into, experimental result shows that idle detection of this system and compensation effect are good.
The grid-connected current tracking test as shown in Figure 3.Among Fig. 3, oscillography passage 1 is a phase grid-connected current waveform, and oscillography passage 2 is the electrical network phase voltage waveform, and current effective value is 28.2A, and the grid side current waveform as shown in Figure 4 under the grid charging pattern; During independent inversion, the voltage waveform of device output as shown in Figure 5.
Claims (3)
1, possess photovoltaic convertor assembly, it is characterized in that from net/be incorporated into the power networks, charge control and power adjustments function:
The output of solar cell array and storage battery inserts dc bus via commutation circuit, and array output end is serially connected with the counnter attack diode, and storage battery output is by diode, power resistor and the contactor bus that inserts in parallel;
Adopt the DSP control unit, setting is by the IGBT power electronic switching T1～T6 of described DSP control unit control, described power electronic switching T1～T6 is connected in the output loop after the three phase full bridge inverter circuit is arranged on array serial connection diode, and described DSP control unit is Sine Wave Pulse Width Modulation SPWM for the control mode of power electronic switching T1～T6;
By the transformer isolation conversion, KM2's inversion outlet side is connected to the grid by contactor through reactance L, and both sides, KM2 contact also are connected to soft start power resistor R2;
Electrical network load-side after the node that is incorporated into the power networks adopts the Hall current instrument transformer, detects idle and harmonic component in the load current, produces the grid-connected current idle component by the DSP control unit according to this, with the required idle and harmonic current of compensating load.
2, device according to claim 1 is characterized in that being provided with contactor KM3 between described inverter circuit and electrical network.
3, device according to claim 1 is characterized in that with the open circuit voltage of described solar cell array and power output as the detectable signal of judging day and night.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100391091A CN1835332A (en) | 2006-03-25 | 2006-03-25 | Photovoltaic converter with functions of disconnecting net, connecting net, charging control and regulating power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100391091A CN1835332A (en) | 2006-03-25 | 2006-03-25 | Photovoltaic converter with functions of disconnecting net, connecting net, charging control and regulating power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1835332A true CN1835332A (en) | 2006-09-20 |
Family
ID=37002984
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|---|---|---|---|
| CNA2006100391091A Pending CN1835332A (en) | 2006-03-25 | 2006-03-25 | Photovoltaic converter with functions of disconnecting net, connecting net, charging control and regulating power |
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| CN101789606A (en) * | 2010-03-12 | 2010-07-28 | 合肥阳光电源有限公司 | Boosting method for synchronization without insulating photovoltaic grid-connected inverters |
| CN101860083A (en) * | 2010-04-19 | 2010-10-13 | 南通大学 | Power supply device of electronic toll collection system vehicle-mount unit |
| CN102255360A (en) * | 2011-07-20 | 2011-11-23 | 浙江大学 | Off-grid solar-lithium iron phosphate lithium ion storage battery power supply system |
| CN101697418B (en) * | 2009-10-23 | 2011-11-30 | 湖南大学 | Photovoltaic inversion grid-connection and harmonic suppression hybrid system for micro grid and composite control method thereof |
| CN101212145B (en) * | 2006-12-31 | 2011-12-21 | 深圳市方大装饰工程有限公司 | Electric power replenishing method and system for photovoltaic system of photoelectric curtain wall |
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| CN102545257A (en) * | 2012-01-12 | 2012-07-04 | 广东中商国通电子有限公司 | Solar photovoltaic generating single-phase grid-connected inverter and control method thereof |
| CN102593868A (en) * | 2012-02-29 | 2012-07-18 | 黑龙江省电力科学研究院 | Distributed three-phase four-wire photovoltaic grid-connected device with electric energy adjusting function |
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| CN102891502A (en) * | 2012-11-08 | 2013-01-23 | 李木 | Energy-saving type three-phase photovoltaic power generation system and control method thereof |
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| CN109103925A (en) * | 2018-07-31 | 2018-12-28 | 国网江苏省电力有限公司淮安供电分公司 | A kind of micro-capacitance sensor based on photovoltaic power generation |
| CN109103925B (en) * | 2018-07-31 | 2022-01-28 | 国网江苏省电力有限公司淮安供电分公司 | Photovoltaic power generation-based microgrid |
| CN114069774A (en) * | 2021-10-28 | 2022-02-18 | 北京宝龙德科技有限责任公司 | Photovoltaic energy storage system for tracking maximum power generated by photovoltaic cell and photovoltaic power generation system based on system |
| CN114069774B (en) * | 2021-10-28 | 2023-01-06 | 刘铭新 | Photovoltaic energy storage system for tracking maximum power generated by photovoltaic cell and photovoltaic power generation system based on system |
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