Summary of the invention
Technical problem to be solved by this invention is: provide a kind of solar energy for solar energy and civil power hybrid power supply from grid-connected control method.
Solve the problems of the technologies described above, the technical solution adopted in the present invention is as follows:
For the solar energy of solar energy and civil power hybrid power supply from a grid-connected control method, this control method is implemented from grid-connected system based on solar energy, it is characterized in that:
Described solar energy comprises the first diesel engine generator, the second diesel engine generator, storage battery, solar grid-connected inverter, two-way combining inverter, city's electric control switch and Centralized Controller from grid-connected system, the input of described city electric control switch is for connecting mains-supplied end, the input of solar grid-connected inverter is for connecting photovoltaic generating system feeder ear, the described input of two-way combining inverter is connected with the feeder ear of storage battery, described Centralized Controller respectively with described city electric control switch, solar grid-connected inverter, first diesel engine generator, control end and the mains-supplied end of the second diesel engine generator and two-way combining inverter are connected, described city electric control switch, solar grid-connected inverter, first diesel engine generator, the output of the second diesel engine generator and two-way combining inverter is all for being connected user's ac bus,
Described Centralized Controller carries out solar energy according to the following steps from cutting-in control:
Step one, solar energy from grid-connected system start after, first detect described mains-supplied end with or without city's signal of telecommunication export, when testing result be without time, perform step 2, when testing result be sometimes, execution step 3;
Step 2, arrange that described first diesel engine generator enters stopped status, city's electric control switch enters off-state, the second diesel engine generator enters normality operational mode, solar grid-connected inverter enters the pattern of being incorporated into the power networks, two-way combining inverter enters the pattern of being incorporated into the power networks, and export with or without city's signal of telecommunication after accomplishing the setting up detecting described mains-supplied end, when testing result be without time, with the first Preset Time for interval period cycle detects, until testing result is sometimes, perform step 4;
Step 3, arrange that described second diesel engine generator enters stopped status, city's electric control switch enters closure state, solar grid-connected inverter enters the pattern of being incorporated into the power networks, the first diesel engine generator enters normality operational mode, two-way combining inverter enters the pattern of being incorporated into the power networks, and export with or without city's signal of telecommunication after accomplishing the setting up detecting described mains-supplied end, when testing result is sometimes, with the second Preset Time for interval period cycle detects, until testing result be without time, perform step 2;
Step 4, continues to judge whether city's signal of telecommunication that mains-supplied end exports is stable, until result is for after being, and execution step 5;
Step 5, arrange that described solar grid-connected inverter enters stopped status, two-way combining inverter enters stopped status, the second diesel engine generator enters synchronous operation pattern, described first diesel engine generator remains on stopped status, city's electric control switch remains on off-state, and when the frequency of the second diesel engine generator output AC electricity, phase place are all identical with city's signal of telecommunication that mains-supplied end exports, perform step 6;
Step 6, described city electric control switch is set and enters closure state, second diesel engine generator enters normality operational mode, and complete these two arrange after described solar grid-connected inverter be set again enter the pattern of being incorporated into the power networks, first diesel engine generator enters normality operational mode, two-way combining inverter enters the pattern of being incorporated into the power networks, second diesel engine generator enters stopped status, finally export with or without city's signal of telecommunication after accomplishing the setting up detecting described mains-supplied end, when testing result is sometimes, with the 3rd Preset Time for interval period cycle detects, until testing result be without time, perform step 2,
Wherein, described first diesel engine generator and the second diesel engine generator all carry out generating electricity and exporting industrial-frequency alternating current under normality operational mode, described second diesel engine generator carries out generating electricity under synchronous operation pattern and output frequency, phase place approach the alternating current of city's signal of telecommunication gradually, described solar grid-connected inverter converts the direct current that photovoltaic generating system feeder ear exports to industrial-frequency alternating current under the pattern of being incorporated into the power networks, and described two-way combining inverter realizes the Bidirectional charging-discharging between storage battery and user's ac bus under the pattern of being incorporated into the power networks.
As a kind of implementation method of the present invention, in described step 4, continue to judge whether city's signal of telecommunication that mains-supplied end exports is that stable method comprises the steps:
One of step 4, waits for after the 4th Preset Time, detects described mains-supplied end and exports with or without city's signal of telecommunication, when testing result be without time, perform step 4 two, when testing result is sometimes, judge that city's signal of telecommunication that mains-supplied end exports is stable;
Step 4 two, waits for after the 5th Preset Time, detects described mains-supplied end and exports with or without city's signal of telecommunication, when testing result be without time, with the 6th Preset Time for interval period cycle detects, until testing result be sometimes, one of execution step 4.
As the preferred embodiment of the present invention; in described step 2, set gradually that described first diesel engine generator enters stopped status, city's electric control switch enters off-state, the second diesel engine generator enters normality operational mode, solar grid-connected inverter enters the pattern of being incorporated into the power networks, two-way combining inverter enters the pattern of being incorporated into the power networks.
As the preferred embodiment of the present invention; in described step 3, set gradually that described second diesel engine generator enters stopped status, city's electric control switch enters closure state, solar grid-connected inverter enters the pattern of being incorporated into the power networks, the first diesel engine generator enters normality operational mode, two-way combining inverter enters the pattern of being incorporated into the power networks.
As the preferred embodiment of the present invention; in described step 6, set gradually that described solar grid-connected inverter enters the pattern of being incorporated into the power networks, the first diesel engine generator enters normality operational mode, two-way combining inverter enters the pattern of being incorporated into the power networks, the second diesel engine generator enters stopped status.
Compared with prior art, the present invention has following beneficial effect:
The solar energy that the present invention is carried out from grid-connected system solar energy by Centralized Controller from cutting-in control, under solar energy intelligentizedly can be operated in following three kinds of situations from grid-connected system:
The normal situation of mains-supplied, see step 3, mains-supplied end exports the industrial-frequency alternating current provided by utility grid in this case, user's ac bus is collected to through city's electric control switch, simultaneously, photovoltaic generating system feeder ear exports the direct current be transformed by solar energy, becomes industrial-frequency alternating current to be collected to user's ac bus through solar grid-connected inverter unsteady flow, also namely: user's ac bus in the normal situation of mains-supplied by civil power and solar energy hybrid power supply;
The situation of mains failure, see step 2, photovoltaic generating system feeder ear provides industrial-frequency alternating current by solar grid-connected inverter to user's ac bus in this case, and, second diesel engine generator continues generating in this case provides industrial-frequency alternating current to user's ac bus, to avoid the unregulated power supply at night of photovoltaic generating system feeder ear, city's electric control switch then cuts off the connection of user's ac bus and utility grid at this moment to ensure grid side safety, also namely: user's ac bus when mains failure by the second diesel engine generator and solar energy hybrid power supply,
Civil power is by having a power failure to situation about restoring electricity, see step 4 to six, in this case first user's ac bus when keep mains failure supply power mode, by step 4, Centralized Controller guarantees that the civil power restored electricity is stable, cause user's ac bus power supply instability to prevent civil power signal from shaking; Then when the second diesel engine generator keeps providing industrial-frequency alternating current to user's ac bus, the connection of photovoltaic generating system feeder ear and storage battery and user's ac bus is cut off by solar grid-connected inverter and two-way combining inverter, to reduce the power supply unit of user's ac bus, reduce the impact of the synchronous operation pattern on the second diesel engine generator; The second last diesel engine generator enters synchronous operation pattern, its generating output frequency, phase place approach the alternating current of city's signal of telecommunication gradually, and when the frequency of output AC electricity, phase place are all identical with city's signal of telecommunication that mains-supplied end exports, Zai Jiang city electric control switch closes and the second diesel engine generator is shut down, user's ac bus gets back to the normal supply power mode of mains-supplied, thus reduction mains-supplied termination enters the impact caused user's ac bus;
In addition, because existing inverter all has the defencive function automatically cut off when ac bus power-off, solar energy of the present invention is provided with from grid-connected system the first diesel engine generator that generate output do not limit, its effect is the electric power source signal keeping user's ac bus when mains failure, can not work on demand when mains failure to avoid solar grid-connected inverter and two-way combining inverter, therefore, first diesel engine generator is only shut down when the second diesel engine generator is in the normal state operational mode or synchronous operation pattern, and under other moment is all operated in normal mode,
Storage battery only disconnects the connection with user's ac bus, to reduce the impact of the synchronous operation pattern on the second diesel engine generator when the second diesel engine generator is proceeded to synchronous operation pattern by normality operational mode by two-way inverter; Storage battery all keeps the connection with user's ac bus by two-way inverter in other moment, thus, when photovoltaic generating system feeder ear is powered to user's ac bus, storage battery plays stablizes solar powered effect, and at mains failure and photovoltaic generating system feeder ear at night unregulated power supply, storage battery provides electric power safeguard in short-term, is that grace time is reserved in the startup of the second diesel engine generator, guarantees that user's ac bus is powered stable.
In sum, present invention achieves the intelligentized control method of solar energy and civil power hybrid power supply, unified management, coordination solar power generation, diesel engine generator generating and batteries to store energy are powered, and entirety improves stability and the reliability of solar energy and civil power hybrid power supply.Further, the present invention can utilize ripe hardware product to implement, and has applied widely, that implementation cost is low advantage, solves that specification in existing control technology is fixed, the drawback of bad adaptability.
Embodiment
As shown in Figure 1, the present invention implements from grid-connected system based on solar energy from grid-connected control method for the solar energy of solar energy and civil power hybrid power supply, this solar energy comprises the first diesel engine generator 103, second diesel engine generator 104, storage battery 105, solar grid-connected inverter 106, two-way combining inverter 107, city's electric control switch 108 and Centralized Controller 109 from grid-connected system, the input of city's electric control switch 108 is for connecting mains-supplied end 101, the input of solar grid-connected inverter 106 is for connecting photovoltaic generating system feeder ear 102, the input of two-way combining inverter 107 is connected with the feeder ear of storage battery 105, Centralized Controller 109 respectively with city's electric control switch 108, solar grid-connected inverter 106, first diesel engine generator 103, control end and the mains-supplied end 101 of the second diesel engine generator 104 and two-way combining inverter 107 are connected, city's electric control switch 108, solar grid-connected inverter 106, first diesel engine generator 103, the output of the second diesel engine generator 104 and two-way combining inverter 107 is all for being connected user's ac bus 110.
Above-mentioned Centralized Controller 109 carries out solar energy according to the following steps from cutting-in control:
Step one, after solar energy starts from grid-connected system, first detects mains-supplied end 101 and exports with or without city's signal of telecommunication, when testing result be without time, perform step 2, when testing result be sometimes, execution step 3;
Step 2, set gradually that the first diesel engine generator 103 enters stopped status 332, city's electric control switch 108 enters that off-state 312, second diesel engine generator 104 enters normality operational mode 341, solar grid-connected inverter 106 enters the mode 3 21 that is incorporated into the power networks, two-way combining inverter 107 enters the mode 3 51 that is incorporated into the power networks, and export with or without city's signal of telecommunication after accomplishing the setting up detecting mains-supplied end 101, when testing result be without time, with the first Preset Time W1 for interval period cycle detects, until testing result is sometimes, perform step 4;
Step 3, set gradually that the second diesel engine generator 104 enters stopped status 342, city's electric control switch 108 enters closure state 311, solar grid-connected inverter 106 enters and be incorporated into the power networks that mode 3 21, first diesel engine generator 103 enters normality operational mode 331, two-way combining inverter 107 enters the mode 3 51 that is incorporated into the power networks, and export with or without city's signal of telecommunication after accomplishing the setting up detecting mains-supplied end 101, when testing result is sometimes, with the second Preset Time W2 for interval period cycle detects, until testing result be without time, perform step 2;
Step 4, continues to judge whether city's signal of telecommunication that mains-supplied end 101 exports is stable, until result is for after being, and execution step 5;
Wherein, continue to judge whether city's signal of telecommunication that mains-supplied end 101 exports is that stable method comprises the steps:
One of step 4, waits for after the 4th Preset Time W4, detects mains-supplied end 101 and exports with or without city's signal of telecommunication, when testing result be without time, perform step 4 two, when testing result is sometimes, judge that city's signal of telecommunication that mains-supplied end 101 exports is stable;
Step 4 two, waits for after the 5th Preset Time W5, detects mains-supplied end 101 and exports with or without city's signal of telecommunication, when testing result be without time, with the 6th Preset Time W6 for interval period cycle detects, until testing result be sometimes, one of execution step 4.
Also namely, under the interval of Preset Time, doublely detect that the mains-supplied Duan101You city signal of telecommunication exports, then can prove that city's signal of telecommunication that mains-supplied end 101 exports is stable completely, thus effectively prevent civil power signal from shaking.
Step 5, arrange that solar grid-connected inverter 106 enters stopped status 322, two-way combining inverter 107 enters stopped status 352, second diesel engine generator 104 and enters synchronous operation mode 3 43, first diesel engine generator 103 remains on stopped status 332, city's electric control switch 108 remains on off-state 312, and when the frequency of the second diesel engine generator 104 output AC electricity, phase place are all identical with city's signal of telecommunication that mains-supplied end 101 exports, perform step 6;
Step 6, city's electric control switch 108 is set and enters closure state 311, second diesel engine generator 104 enters normality operational mode 341, and complete these two arrange after set gradually solar grid-connected inverter 106 again and enter the mode 3 21 that is incorporated into the power networks, first diesel engine generator 103 enters normality operational mode 331, two-way combining inverter 107 enters the mode 3 51 that is incorporated into the power networks, second diesel engine generator 104 enters stopped status 342, finally export with or without city's signal of telecommunication after accomplishing the setting up detecting mains-supplied end 101, when testing result is sometimes, with the 3rd Preset Time W3 for interval period cycle detects, until testing result be without time, perform step 2,
Wherein, first diesel engine generator 103 and the second diesel engine generator 104 are in normality operational mode 331, all carry out for 341 times generating electricity and exporting industrial-frequency alternating current, second diesel engine generator 104 carries out generating for 43 times and output frequency at synchronous operation mode 3, phase place approaches the alternating current of city's signal of telecommunication gradually, solar grid-connected inverter 106 converts the direct current that photovoltaic generating system feeder ear 102 exports to industrial-frequency alternating current 21 times at the mode 3 that is incorporated into the power networks, the Bidirectional charging-discharging that two-way combining inverter 107 realizes between storage battery 105 and user's ac bus 110 for 51 times at the mode 3 that is incorporated into the power networks.
Solar energy of the present invention from the operation principle of grid-connected control method is:
The solar energy carried out from grid-connected system by Centralized Controller 109 pairs of solar energy from cutting-in control, under solar energy intelligentizedly can be operated in following three kinds of situations from grid-connected system:
The normal situation of mains-supplied, see step 3, mains-supplied end 101 exports the industrial-frequency alternating current provided by utility grid in this case, user's ac bus 110 is collected to through city's electric control switch 108, simultaneously, photovoltaic generating system feeder ear 102 exports the direct current be transformed by solar energy, become industrial-frequency alternating current to be collected to user's ac bus 110 through solar grid-connected inverter 106 unsteady flow, also namely: user's ac bus 110 in the normal situation of mains-supplied by civil power and solar energy hybrid power supply;
The situation of mains failure, see step 2, photovoltaic generating system feeder ear 102 provides industrial-frequency alternating current by solar grid-connected inverter 106 to user's ac bus 110 in this case, and, second diesel engine generator 104 continues generating in this case provides industrial-frequency alternating current to user's ac bus 110, to avoid photovoltaic generating system feeder ear 102 unregulated power supply at night, city's electric control switch 108 then cuts off the connection of user's ac bus 110 and utility grid at this moment to ensure grid side safety, also namely: user's ac bus 110 when mains failure by the second diesel engine generator 104 and solar energy hybrid power supply,
Civil power is by having a power failure to situation about restoring electricity, see step 4 to six, in this case first user's ac bus 110 when keep mains failure supply power mode, by step 4, Centralized Controller 109 guarantees that the civil power restored electricity is stable, cause user's ac bus 110 power supply instability to prevent civil power signal from shaking; Then when the second diesel engine generator 104 keeps providing industrial-frequency alternating current to user's ac bus 110, the connection of photovoltaic generating system feeder ear 102 and storage battery 105 and user's ac bus 110 is cut off by solar grid-connected inverter 106 and two-way combining inverter 107, to reduce the power supply unit of user's ac bus 110, reduce the impact of the synchronous operation pattern on the second diesel engine generator 104; The second last diesel engine generator 104 enters synchronous operation pattern, its generating output frequency, phase place approach the alternating current of city's signal of telecommunication gradually, and when the frequency of output AC electricity, phase place are all identical with city's signal of telecommunication that mains-supplied end 101 exports, Zai Jiang city electric control switch 108 closes and the second diesel engine generator 104 is shut down, user's ac bus 110 gets back to the normal supply power mode of mains-supplied, thus reduction mains-supplied end 101 accesses the impact caused user's ac bus 110;
In addition, because existing inverter all has the defencive function automatically cut off when ac bus power-off, solar energy of the present invention is provided with from grid-connected system the first diesel engine generator 103 that generate output do not limit, its effect is the electric power source signal keeping user's ac bus 110 when mains failure, can not work on demand when mains failure to avoid solar grid-connected inverter 106 and two-way combining inverter 107, therefore, first diesel engine generator 103 is only shut down when the second diesel engine generator 104 is in the normal state operational mode or synchronous operation pattern, and under other moment is all operated in normal mode,
Storage battery 105 only disconnects the connection with user's ac bus 110 when the second diesel engine generator 104 is proceeded to synchronous operation pattern by normality operational mode by two-way inverter 107, to reduce the impact of the synchronous operation pattern on the second diesel engine generator 104; Storage battery 105 all keeps the connection with user's ac bus 110 by two-way inverter 107 in other moment, thus, when photovoltaic generating system feeder ear 102 is powered to user's ac bus 110, storage battery 105 plays stablizes solar powered effect, and at mains failure and photovoltaic generating system feeder ear 102 at night unregulated power supply, storage battery 105 provides electric power safeguard in short-term, be that grace time is reserved in the startup of the second diesel engine generator 104, guarantee that user's ac bus 110 is powered stable.
See Fig. 2, it is as follows from the idiographic flow of cutting-in control that Centralized Controller 109 carries out solar energy:
Step 201, start up system, and step 202 is entered after successfully starting, in this step 201, enter except operating state except Centralized Controller 109 powers on, after solar energy is all in stopped status city power recovery from all the other parts of grid-connected system by transfer to from network operation be incorporated into the power networks time, the first step stand-by period judges whether city's signal of telecommunication continues in case stop signal concussion, second step arranges solar grid-connected inverter, two-way combining inverter is to shutting down to reduce generator unit, it is synchronous gradually with civil power that 3rd step arranges the second diesel engine generator, 4th arranges city's electric control switch to closed, system grid connection is run.；
Step 202, detects with or without city's signal of telecommunication, if NO enters step 203, enter step 207 if yes;
Step 203, arranges city's electric control switch 108 to off-state 312, arranges the second diesel engine generator 104 to normality and runs 341, enter step 204 after setting completed;
Step 204, arranges solar grid-connected inverter 106 to being incorporated into the power networks 321, arranging two-way combining inverter 107 to being incorporated into the power networks 351, all entering step 205 after setting completed.
Step 205, detects with or without city's signal of telecommunication, if NO enters step 206, enter step 215 if yes.
Step 206, returns step 204 after stand-by period W1.
Step 207, city's electric control switch 108 to closure state 311 is set, solar grid-connected inverter 106 is set to being incorporated into the power networks 321, the first diesel engine generator 103 to normality is set and runs 331, two-way combining inverter 107 being set to being incorporated into the power networks 351, all entering step 208 after setting completed.
Step 208, detects with or without city's signal of telecommunication, enters step 209 if yes, if NO enter step 210.
Step 209, returns step 208 after stand-by period W2.
Step 210, arranges city's electric control switch 108 to off-state 312, enters step 211 after setting completed.
Step 211, arranges the second diesel engine generator 104 to normality and runs 341, enter step 212 after setting completed.
Step 212, arranges the first diesel engine generator 103 to shutdown 332, enters step 213 after setting completed.
Step 213, detects with or without city's signal of telecommunication, if NO enters step 214, enter step 215 if yes.
Step 214, returns step 213 after stand-by period W1.
Step 215, enters step 216 after stand-by period W4.
Step 216, detects with or without city's signal of telecommunication, if NO enters step 217, enter step 220 if yes.
Step 217, enters step 218 after stand-by period W5.
Step 218, detects with or without city's signal of telecommunication, if NO enters step 219, return step 215 if yes.
Step 219, returns step 218 after stand-by period W6.
Step 220, arranges solar grid-connected inverter 106 to shutdown 322, arranges two-way combining inverter 107 to shutdown 352, all enters step 221 after setting completed.
Step 221, arranges the second diesel engine generator 104 to synchronous operation 343, waits for and replys civil power synchronizing signal, enter step 222 after receiving synchronizing signal.
Step 222, arranges city's electric control switch 108 to closure state 311, arranges the second diesel engine generator 104 to normality and runs 341, all enter step 223 after setting completed.
Step 223; solar grid-connected inverter 106 being set to being incorporated into the power networks 321, the first diesel engine generator 103 to normality being set and running 331, two-way combining inverter 107 is set to being incorporated into the power networks 351; second diesel engine generator 104 to shutdown 342 is set, all enters step 224 after setting completed.
Step 224, detects with or without city's signal of telecommunication, enters step 225 if yes, if NO return step 210.
Step 225, returns step 224 after stand-by period W3.
The present invention does not limit to and above-mentioned embodiment; according to foregoing; according to ordinary technical knowledge and the customary means of this area; do not departing under the present invention's above-mentioned basic fundamental thought prerequisite; the present invention can also make the equivalent modifications of other various ways, replacement or change, all drops among protection scope of the present invention.