CN103208811B - Control method of mains supply grid-connected power supply system - Google Patents
Control method of mains supply grid-connected power supply system Download PDFInfo
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- CN103208811B CN103208811B CN201210007624.7A CN201210007624A CN103208811B CN 103208811 B CN103208811 B CN 103208811B CN 201210007624 A CN201210007624 A CN 201210007624A CN 103208811 B CN103208811 B CN 103208811B
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Abstract
The invention relates to a control method of a mains supply grid-connected power supply system. The output ends of a plurality of power supply modules are jointly connected with a relay and are connected with a mains supply power gird through the relay, and a controller controls all the power supply modules and the relay respectively to form the mains supply grid-connected power supply system. After the system is started, the controller judges whether power sources are input into all the power supply modules, starts the power supply modules with input power sources and charges energy-storage capacitors of the power supply modules, judges whether voltage of the energy-storage capacitors of the power supply modules is larger than a set mains supply peak voltage, and starts the relay when the voltage of the energy-storage capacitors of all the power supply modules is larger than the set mains supply peak voltage. Therefore, the relay is not required to be arranged at the output end of each power supply module for isolation, and further the number of the relays can be decreased.
Description
Technical field
The invention relates to a kind of civil power grid type power system, espespecially a kind of control method of civil power grid type power system.
Background technology
Be about to exhausted subject under discussion at earth energy lead in having green group constantly to declare in recent years always, therefore Looking For Substitutions Of Oil has become an important target of various countries, wherein, after utilizing the transform light energy of the sun to become electric energy and to supply that each electric equipment products use be at present quite common a kind of technology.
Currently available technology takes civil power grid type power system, has set about wind-driven generator, the renewable energy resources such as solar power generation are integrated, again by these renewable energy resources conversion after and civil power grid-connected, to reduce civil power use amount, refer to Fig. 4 about aforementioned civil power grid type power system, it includes one first power supply module 80 and a second source supply module 90, and wherein first, second source supply module 80, 90 respectively by solar panels 81, 91 absorb luminous energy and are converted to electric energy, and via DC-DC converter 82, 92 and rectifier 83, 93 are converted to after direct current storage capacitor C11, C22 charges, until storage capacitor C11, the large line voltage connect later of the charging voltage Vbus1 of C22 or Vbus2, begins this relay 70 closed (conducting), and makes rectifier 83, 93 export direct current energies respectively via direct current to a-c transducer 84, 94 be converted to AC power after export output capacitance C1 to, C2 and then grid-connected with civil power, thus can by solar energy, after the regenerated energy that wind-force etc. produce is converted to electric energy, via first, second source supply module 80, 90 power supplys provided and civil power grid-connected, reduce the use amount of civil power thus, so save power supply.
In aforementioned prior art, when solar panels 81, 91 wherein one group do not provide the energy to power supply module 80, when 90, therefore as generation storage capacitor C11, the voltage Vbus1 of C12, Vbus2 be less than this line voltage peak value and closing relay 70 time, this line voltage can via this direct current to a-c transducer 84, the body diode of the metal-oxide half field effect transistor in 94 is to this storage capacitor C11, C12 charges, and a burst current can be produced in time recharging, and flow through the body diode of this metal-oxide half field effect transistor and produce a large amount of power (P=IV), cause this metal-oxide half field effect transistor to generate heat even to damage, therefore in order to avoid line voltage is to this storage capacitor C11, C12 charges, usually the output in each power supply module connects a relay 85, 95 (as shown in Figure 5), with really isolated each power supply module and line voltage, and then avoid direct current to damage a-c transducer.
Connect a relay by each power supply module output can really isolate with civil power grid-connected though aforementioned again, and then avoid the direct current in each power supply module to damage a-c transducer, volume so spent by this relay is comparatively large and cost is higher, during in case of having the power system of multi-group power supply module, excessive and the high cost of the volume spent by entirety can be made because of this relay, in view of science and technology pursues the target of miniature now, there is necessity of self-criticism in fact, and seek feasible solution.
Summary of the invention
In view of the shortcoming of aforementioned prior art, main purpose of the present invention is providing a kind of control method reducing the civil power grid type power system of relay, makes overall volume be reduced and reduce costs thus.
The technological means taked for reaching above-mentioned purpose is the control method making aforementioned civil power grid type power system, mainly jointly be connected with a relay by the output of multiple power supply module, and be connected with utility grid by relay, and control each power supply module and relay respectively to form a civil power grid type power system with a controller, wherein, each power supply module includes: one regenerates energy conversion apparatus, an input capacitance, a direct current to DC conversion unit, a direct current to a-c transducer and an output circuit; Wherein this direct current is provided with a storage capacitor to DC conversion unit and direct current in parallel between a-c transducer, and this direct current comprises more than one metal-oxide half field effect transistor to a-c transducer, and is connected between output circuit and storage capacitor; Perform following steps by controller after system starts:
A. judge whether the renewable energy resources conversion equipment of each power supply module has out-put supply;
B. start the power supply module that renewable energy resources conversion equipment has out-put supply, its direct current is charged to the storage capacitor of this power supply module to DC conversion unit; The voltage of this storage capacitor is also converted to form of communication by direct current to a-c transducer and delivers to output circuit;
C. judging whether the storage capacitor voltage of each power supply module is greater than the civil power crest voltage of a setting, as not being greater than civil power crest voltage, then repeating this step;
D. when the storage capacitor voltage of all power supply modules is all greater than the civil power crest voltage of setting, beginning starting relay;
Utilize above-mentioned control method, when the renewable energy resources conversion equipment of one of them power supply module does not work, when thus its storage capacitor cannot be promoted to more than civil power crest voltage, the power supply module of work is except charging to its storage capacitor, also the voltage of storage capacitor is converted to form of communication through direct current to a-c transducer and delivers to output circuit again, because the output circuit of each power supply module is parallel with one another, so the AC power delivering to output circuit will deliver to the output circuit of the power supply module do not worked simultaneously, the storage capacitor of the power supply module do not worked is charged after the body diode rectification of direct current to the metal-oxide half field effect transistor of a-c transducer is DC power supply by the output circuit of the power supply module do not worked again, when the storage capacitor voltage of all power supply modules is all higher than civil power crest voltage, restart relay and civil power is grid-connected, utilize above-mentioned control method, namely need not set up relay separately as isolation at the output of each power supply module, thus the quantity of relay can be reduced.
Accompanying drawing explanation
Fig. 1 is detailed circuit diagram of the present invention;
Fig. 2 is the flow chart of controller of the present invention;
Fig. 3 is storage capacitor of the present invention charging schematic diagram;
Fig. 4 is the detailed circuit diagram of prior art;
Fig. 5 is the detailed circuit diagram of another prior art.
Embodiment
About a preferred embodiment of the present invention, refer to Fig. 1, the control method of this civil power grid type power system, consist predominantly of the power supply module 10 of more than two, 20 and controlled by a controller 30, another each power supply module 10 simultaneously, the output of 20 connects a relay 40 in parallel, for by relay 40 and civil power grid-connected, in the present embodiment, this controller 30 has multiple input and multiple output, this relay 40 another has an input and an output, and there is in relay a paired switch, this power system mainly has one first power supply module 10 and a second source supply module 20 again, and connects a regeneration energy conversion apparatus 11 from input respectively to output is then main, 21, one direct current is to DC conversion unit 12, 22, one direct current is to a-c transducer 13, 23 and an output circuit 14, 24, in the present embodiment, this direct current is to DC conversion unit 12, 22 are sequentially provided with to output from input: a transducer 121, 221, one transformer 122, 222, and a rectifier 123, 223, and input and transducer 121, an input capacitance Cs1 is provided with in parallel between 221, Cs2, wherein:
Aforementioned each renewable energy resources conversion equipment 11,21 has an input and an output, be a DC power supply by the various power conversion of input, again this DC power supply is exported to the direct current of next stage by output to DC conversion unit 12,22, wherein, this renewable energy resources conversion equipment 11,21 can be wind-driven generator, solar cell, battery etc., is to use solar cell in the present embodiment;
Aforementioned each direct current has an input and an output to DC conversion unit 12,22, this input is the output connecting aforementioned renewable energy resources conversion equipment 11,21, mainly via direct current, the DC power supply that aforementioned renewable energy resources conversion equipment 11,21 exports is converted to stable direct-current working volts to DC conversion unit 12,22, enablely export subordinate to, wherein:
This input capacitance Cs1, Cs2 main purpose are that the DC power supply exported by renewable energy resources conversion equipment 11,21 produces input voltage V1, a V2, to export the transducer 121,221 of rear class to, wherein each input voltage V1, V2 respectively controlled device 30 detected;
This transducer 121,221 has an input and an output, and input is in parallel with aforementioned input capacitance Cs1, Cs2 and is connected DC conversion unit 12,22 input with direct current, this transducer 121,221 main purpose is after aforementioned input voltage V1, V2 are converted to a high-frequency ac operating voltage, then is exported to the primary side of transformer 122,222 of next stage by output;
The primary side of this transformer 122,222 is connected with aforementioned transducer 121,221 output, and being exported to the rectifier 123,223 of rear class by secondary side one end, this transformer 122,222 main purpose is that the high-frequency ac operating voltage that aforementioned transducer 121,221 exports is converted to another high-frequency ac operating voltage;
This rectifier 123,223 has an input and an output, this input is the secondary side one end being connected to aforementioned transformer 122,222, mainly convert the high-frequency ac voltage that aforementioned transformer 122,222 exports in secondary side to stable direct-current working volts, in the present embodiment, this rectifier 123,223 is bridge rectifiers;
Aforementioned direct current can be used in multi-set isolation type or non-isolation type framework to DC conversion unit 12,22, and this transducer 121,221 of indefinite and rectifier 123,223 framework kenel, as full-bridge, half-bridge, in the present embodiment, this direct current is use multi-set isolation type framework to DC conversion unit 12,22, and there are four metal-oxide half field effect transistors, its grid is that the output being connected to controller respectively also controls by it;
Aforementioned each direct current is to a-c transducer 13, 23 have an input and an output, this input is connected to aforementioned rectifier 123, the output of 223, mainly transfer aforementioned direct current to alternating current and export next stage to, wherein, this direct current is to a-c transducer 13, 23 can be used in multi-set isolation type or non-isolation type framework, and and indefinite direct current to a-c transducer framework kenel, as full-bridge, half-bridge etc., in the present embodiment, this direct current is to a-c transducer 13, 23 is use multi-set isolation type framework, and there are four metal-oxide half field effect transistors, its grid is that the output being connected to controller respectively also controls by it,
Aforementioned each output circuit 14, 24 have an input and an output, connect respectively an outputting inductance L1 between input to output, a L2 and output capacitance C1 in parallel, C2, input connects aforementioned direct current to a-c transducer 13 again, the output of 23, output is then respectively with first, second source supply module 10, the output of 20 connects, make this output capacitance C1, C2 be jointly connect relay 30 input and form mutual parallel connection, wherein, this outputting inductance L1, L2 and output capacitance C1, the combination of C2 can form a filter, make this output circuit 14, the voltage of 24 exportable special frequency bands, this output circuit 14 another, 24 main purposes are to a-c transducer 13 by the direct current of previous stage, 23 AC energy exported are in this output capacitance C1, C2 upper generation one output voltage,
Above-mentioned relevant direct current distinguishes storage capacitor C11 and C22 in parallel to DC conversion unit 12,22 and direct current between a-c transducer 13,23;
Above-mentioned relevant controlling device 30 has multiple input and multiple output, its input connects each input capacitance Cs1 respectively, Cs2 and each storage capacitor C11, C22 is to read this magnitude of voltage respectively, output is connected to direct current respectively to DC conversion unit 12, each metal-oxide half field effect transistor Q11 of 22, Q12, Q13, Q14, Q21, Q22, Q23, the grid of Q24, and direct current is to a-c transducer 13, each metal-oxide half field effect transistor Q15 of 23, Q16, Q17, Q18, Q25, Q26, Q27, whether the grid of Q28 control the conducting of each metal-oxide half field effect transistor respectively, a paired output is separately had to be connected to relay 40 to control its switch closed (conducting), wherein, after power system starts, this controller 30 performs following steps (as shown in Figure 2):
A. judge whether the renewable energy resources conversion equipment 11,21 of each power supply module 10,20 has out-put supply (301);
B. start the power supply module 10,20 that renewable energy resources conversion equipment 11,21 has out-put supply, its direct current is charged to storage capacitor C11, C22 of this power supply module 10,20 to DC conversion unit 12; The voltage of this storage capacitor C11, C22 is also converted to form of communication by direct current to a-c transducer 13,23 and delivers to output circuit (302);
C. judge whether storage capacitor C11, C22 voltage of each power supply module 10,20 is greater than the civil power crest voltage of a setting, storage capacitor C11, C22 voltage as not all power supply module 10,20 is all greater than civil power crest voltage, then repeat this step (303);
D. when storage capacitor C11, C22 voltage of all power supply modules 10,20 is all greater than the civil power crest voltage of setting, beginning starting relay (304);
Utilize above-mentioned formed power system, controller 30 is for there being input voltage V1 at the beginning, first of V2, second source supply module 10, 20 drive this direct current to DC conversion unit 12, 22, make this input voltage V1, V2 can via direct current to DC conversion unit 12, 22, transformer 122, 222 and rectifier 123, 223 respectively to this storage capacitor C11, C22 charging is to produce tank voltage Vbus1, Vbus2, this tank voltage Vbus1 is judged again by controller 30, whether Vbus2 is greater than civil power crest voltage, as being greater than civil power crest voltage, then starting relay 40 is grid-connected with civil power, and drive direct current to a-c transducer 13, 23 by this tank voltage Vbus1, Vbus2 is toward the output circuit 14 of rear class, 24 conveyings, wherein, if there is a wherein power supply module to operate, in the present embodiment, refer to Fig. 3, that hypothesis first power supply module 10 cannot operate, then the renewable energy resources conversion equipment 21 of second source supply module 20 obtains energy and sets up input voltage V2 in input capacitance Cs2, this Time Controller 30 starts this direct current to DC conversion unit 22 because obtaining this input voltage V2, and by this transformer 222 and rectifier 223, this storage capacitor C22 is charged, until after the tank voltage Vbus2 of this storage capacitor C22 is greater than civil power crest voltage, this controller begins to start this direct current makes this tank voltage Vbus2 can carry toward the output circuit 24 of rear class to a-c transducer 23, and set up an output voltage Vo2 in this output capacitance C2, wherein, the tank voltage Vbus1 detecting this first power supply module 10 storage capacitor C11 because of this controller 30 is less than civil power crest voltage, therefore this relay 40 not closed (conducting), meanwhile, because the output capacitance C1 of the output capacitance C2 in the output circuit 24 of this second source supply module 20 and the first power supply module 10 is parallel with one another, therefore the output voltage Vo2 of this output capacitance C2 can produce the output voltage Vo1 of a correspondence in output capacitance C1, pass through again this direct current to each metal-oxide half field effect transistor Q15 in a-c transducer 13, Q16, Q17, output voltage Vo1 rectification is DC power supply and charges to this storage capacitor C11 by the body diode of Q18, until after the tank voltage Vbus1 of this storage capacitor C11 and the tank voltage Vbus2 of storage capacitor C22 is all greater than civil power crest voltage, this controller 30 begins starting relay 40 grid-connected with civil power, utilize above-mentioned control method, except preventing civil power surging from recharging and causing direct current to the damage of a-c transducer, also relay need not be set up separately as isolation at the output of each power supply module, thus the quantity of relay can be reduced, to reach the target of miniature, and then promote the competitiveness in market.
The above is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, not departing from the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. the control method of a civil power grid type power system, it is characterized in that, mainly jointly be connected with single relay by the output of multiple power supply module, and be connected with utility grid by relay, and control each power supply module and relay respectively to form a civil power grid type power system with a controller, wherein, each power supply module includes: one regenerates energy conversion apparatus, a direct current to DC conversion unit, a direct current to a-c transducer and an output circuit; Wherein this direct current is provided with a storage capacitor to DC conversion unit and direct current in parallel between a-c transducer, renewable energy resources conversion equipment and direct current are provided with an input capacitance in parallel between DC conversion unit, this direct current comprises more than one metal-oxide half field effect transistor to a-c transducer, and is connected between output circuit and storage capacitor; Perform following steps by controller after system starts:
A. judge whether the renewable energy resources conversion equipment of each power supply module has out-put supply;
B. start the power supply module that renewable energy resources conversion equipment has out-put supply, its direct current is charged to the storage capacitor of this power supply module to DC conversion unit; The voltage of this storage capacitor is also converted to AC power by direct current to a-c transducer and delivers to output circuit, this AC power exports to the output circuit of the power supply module do not worked simultaneously, is charged after this AC power is converted to DC power supply to a-c transducer by the direct current of self by the output circuit of the power supply module do not worked to the storage capacitor of the power supply module do not worked;
C. judging whether the storage capacitor voltage of each power supply module is greater than the civil power crest voltage of a setting, as not being greater than civil power crest voltage, then repeating this step;
D. when the storage capacitor voltage of all power supply modules is all greater than the civil power crest voltage of setting, beginning starting relay.
2. the control method of civil power grid type power system according to claim 1, is characterized in that, this renewable energy resources conversion equipment is wind-driven generator.
3. the control method of civil power grid type power system according to claim 1, is characterized in that, this renewable energy resources conversion equipment is solar cell.
4. the control method of civil power grid type power system according to claim 1, is characterized in that, this renewable energy resources conversion equipment is battery.
5. the control method of civil power grid type power system according to any one of claim 1 to 4, it is characterized in that, this direct current is multi-set isolation type to DC conversion unit.
6. the control method of civil power grid type power system according to any one of claim 1 to 4, is characterized in that, this direct current is many group non-isolation type frameworks to DC conversion unit.
7. the control method of civil power grid type power system according to any one of claim 1 to 4, is characterized in that, this direct current is full-bridge type framework to DC conversion unit.
8. the control method of civil power grid type power system according to any one of claim 1 to 4, is characterized in that, this direct current is semibridge system framework to DC conversion unit.
9. the control method of civil power grid type power system according to any one of claim 1 to 4, is characterized in that, this direct current is boost type framework to DC conversion unit.
10. the control method of civil power grid type power system according to any one of claim 1 to 4, is characterized in that, this direct current is buck framework to DC conversion unit.
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| CN201210007624.7A CN103208811B (en) | 2012-01-11 | 2012-01-11 | Control method of mains supply grid-connected power supply system |
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| CN201210007624.7A CN103208811B (en) | 2012-01-11 | 2012-01-11 | Control method of mains supply grid-connected power supply system |
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| CN103208811B true CN103208811B (en) | 2015-01-28 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860270A (en) * | 2010-04-26 | 2010-10-13 | 成都雷奥风电传感器有限公司 | Access system for adequately utilizing wind energy and solar energy and realization method thereof |
| CN102104263A (en) * | 2009-12-17 | 2011-06-22 | 台达电子工业股份有限公司 | High voltage direct current uninterruptible power supply system with multiple input power sources |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8067855B2 (en) * | 2003-05-06 | 2011-11-29 | Enecsys Limited | Power supply circuits |
| WO2011032287A1 (en) * | 2009-09-18 | 2011-03-24 | Queen's University At Kingston | Distributed power generation interface |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102104263A (en) * | 2009-12-17 | 2011-06-22 | 台达电子工业股份有限公司 | High voltage direct current uninterruptible power supply system with multiple input power sources |
| CN101860270A (en) * | 2010-04-26 | 2010-10-13 | 成都雷奥风电传感器有限公司 | Access system for adequately utilizing wind energy and solar energy and realization method thereof |
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