CN104242352A - Group control method, device and system, photovoltaic inverter and photovoltaic system - Google Patents
Group control method, device and system, photovoltaic inverter and photovoltaic system Download PDFInfo
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- CN104242352A CN104242352A CN201410541942.0A CN201410541942A CN104242352A CN 104242352 A CN104242352 A CN 104242352A CN 201410541942 A CN201410541942 A CN 201410541942A CN 104242352 A CN104242352 A CN 104242352A
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a group control method, device and system, a photovoltaic inverter and a photovoltaic system. An inverter unit group control method under a weak light condition comprises the following steps: acquiring input voltage parameters of each inverter unit in a multi-path MPPT (Maximum Power Point Tracking) photovoltaic inverter; adjusting the running states of the inverter units until reaching the same input voltage, wherein the input voltage is determined by the input voltage parameter; controlling DC contactors which are bridged at the DC sides of every two adjacent inverter units to be closed; controlling some of the inverter units to be stopped and the rest inverter units to be worked in the position with the maximum power, so as to raise the utilization rate of photovoltaic energy of the multi-path MPPT photovoltaic inverter and lower down the sudden change of the output power of the inverter when the DC contactor is disconnected and connected on the premise that high conversion efficiency of the multi-path MPPT photovoltaic inverter is ensured.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, more particularly, relate to group control method, cluster control unit, group control system, photovoltaic DC-to-AC converter and photovoltaic system.
Background technology
Photovoltaic DC-to-AC converter is the energy conversion device in grid-connected photovoltaic system, sends into electrical network for after the converting direct-current power into alternating-current power that exported by photovoltaic array.Fig. 1 shows a kind of multichannel MPPT (Maxmum Power Pont Trackng, MPPT maximum power point tracking) photovoltaic DC-to-AC converter, its adopt multiple can the inversion unit of independent operating, and the DC side cross-over connection D.C. contactor of adjacent two inversion units.Its operation principle is, disconnects described D.C. contactor when illumination is stronger, and each inversion unit independent operating, carries out respective MPPT maximum power point tracking; Close described D.C. contactor when illumination is more weak, and control section inversion unit is shut down, and can improve the complete machine conversion efficiency of photovoltaic DC-to-AC converter under low-light condition like this.
But easily damage under large impact electric current due to D.C. contactor and do not possess the ability of disjunction reverse current; therefore before closing or disconnecting D.C. contactor; need to allow the inversion unit of its both sides first shut down; after D.C. contactor is closed, control section inversion unit is restarted again, and follows the trail of maximum power point.But; inversion unit is shut down and inverter complete machine power output must be made to undergo mutation; cause interference to the stability of line voltage, and inversion unit restarts after shutting down and the process of again following the trail of maximum power point is relatively slower, photovoltaic energy can only waste during this period.
Therefore, how under the prerequisite ensureing the conversion efficiency that multichannel MPPT photovoltaic DC-to-AC converter is higher, improve the photovoltaic energy utilance of described multichannel MPPT photovoltaic DC-to-AC converter, and reduce the sudden change of inverter output power when D.C. contactor disconnects and closes, become photovoltaic industry problem demanding prompt solution.
Summary of the invention
In view of this, the invention provides group control method, cluster control unit, group control system, photovoltaic DC-to-AC converter and photovoltaic system, to realize under the prerequisite ensureing the conversion efficiency that multichannel MPPT photovoltaic DC-to-AC converter is higher, improve the photovoltaic energy utilance of described multichannel MPPT photovoltaic DC-to-AC converter, and reduce the sudden change of inverter output power when D.C. contactor disconnects and closes.
An inversion unit group control method under low-light condition, comprising:
Obtain the input voltage parameter of each inversion unit in multichannel MPPT photovoltaic DC-to-AC converter;
Regulate the running status of described inversion unit, until described inversion unit reaches identical input voltage, the size of this input voltage is determined by described input voltage parameter;
The D.C. contactor controlling to be connected across the DC side of often adjacent two described inversion units closes;
The part inversion unit controlled in described inversion unit is shut down, all the other inversion units are operated in maximum power place.
Alternatively, after the running status of the described inversion unit of described adjustment, also comprise: if described inversion unit does not reach identical input voltage within the first stipulated time, then generate and export failure alarm signal.
An inversion unit group control method under high light conditions, comprising:
Obtain the current parameters on the 1st D.C. contactor in multichannel MPPT photovoltaic DC-to-AC converter;
Regulate the running status of each inversion unit in described multichannel MPPT photovoltaic DC-to-AC converter, until the current parameters on described 1st D.C. contactor is zero;
Control described 1st D.C. contactor to disconnect;
The like, until last D.C. contactor in described multichannel MPPT photovoltaic DC-to-AC converter disconnects, afterwards, control described inversion unit and be operated in respective maximum power place respectively.
Alternatively, in described adjustment described multichannel MPPT photovoltaic DC-to-AC converter each inversion unit running status after, also comprise: if described first direct current contact on current parameters within the second stipulated time, do not reach zero, then generate and export failure alarm signal.
A kind of inversion unit group control method, comprising:
When low-light environment being detected, perform the inversion unit group control method under low-light condition; And when intense light irradiation environment being detected, perform the inversion unit group control method under high light conditions;
Wherein, the inversion unit group control method under described low-light condition comprises: the input voltage parameter obtaining each inversion unit in multichannel MPPT photovoltaic DC-to-AC converter; Regulate the running status of described inversion unit, until described inversion unit reaches identical input voltage, the size of this input voltage is determined by described input voltage parameter; The D.C. contactor controlling to be connected across the DC side of often adjacent two described inversion units closes; The part inversion unit controlled in described inversion unit is shut down, all the other inversion units are operated in maximum power place;
Inversion unit group control method under described high light conditions comprises: obtain the current parameters on the 1st D.C. contactor in multichannel MPPT photovoltaic DC-to-AC converter; Regulate the running status of each inversion unit in described multichannel MPPT photovoltaic DC-to-AC converter, until the current parameters on described 1st D.C. contactor is zero; Control described 1st D.C. contactor to disconnect; The like, until last D.C. contactor in described multichannel MPPT photovoltaic DC-to-AC converter disconnects, afterwards, control described inversion unit and be operated in respective maximum power place respectively.
A kind of cluster control unit, comprising:
The first interface be connected with D.C. contactor each in multichannel MPPT photovoltaic DC-to-AC converter;
The second interface be connected with each inversion unit in described multichannel MPPT photovoltaic DC-to-AC converter
For receiving the 3rd interface of the current parameters on described D.C. contactor;
And the main control unit be connected with the 3rd interface with described first interface, the second interface respectively, for when low-light environment being detected, perform the inversion unit team control operation under low-light condition, and when intense light irradiation environment being detected, perform the inversion unit team control operation under high light conditions;
Wherein, the inversion unit team control operation under described low-light condition comprises: the input voltage parameter obtaining each inversion unit in multichannel MPPT photovoltaic DC-to-AC converter; Regulate the running status of described inversion unit, until described inversion unit reaches identical input voltage, the size of this input voltage is determined by described input voltage parameter; The D.C. contactor controlling to be connected across the DC side of often adjacent two described inversion units closes; The part inversion unit controlled in described inversion unit is shut down, all the other inversion units are operated in maximum power place;
Inversion unit team control operation under described high light conditions comprises: obtain the current parameters on the 1st D.C. contactor in multichannel MPPT photovoltaic DC-to-AC converter; Regulate the running status of each inversion unit in described multichannel MPPT photovoltaic DC-to-AC converter, until the current parameters on described 1st D.C. contactor is zero; Control described 1st D.C. contactor to disconnect; The like, until last D.C. contactor in described multichannel MPPT photovoltaic DC-to-AC converter disconnects, afterwards, control described inversion unit and be operated in respective maximum power place respectively.
A kind of group control system, comprising: for measuring the DC current sensor of the electric current in multichannel MPPT photovoltaic DC-to-AC converter on each D.C. contactor, and above-mentioned cluster control unit.
A kind of multichannel MPPT photovoltaic DC-to-AC converter, wherein, described multichannel MPPT photovoltaic DC-to-AC converter has above-mentioned group control system.
A kind of photovoltaic system, comprises above-mentioned multichannel MPPT photovoltaic DC-to-AC converter.
A kind of photovoltaic system, comprises multichannel MPPT photovoltaic DC-to-AC converter and above-mentioned group control system.
As can be seen from above-mentioned technical scheme; the inversion unit that the present invention controls when illumination is more weak in multichannel MPPT photovoltaic DC-to-AC converter runs with identical input voltage; poor with the D.C. contactor two ends no-voltage realizing being connected across connected two inversion unit DC side; so now closed described D.C. contactor would not produce impulse current again; be operated in maximum power place by the shutdown of control section inversion unit, all the other inversion units after this, the complete machine conversion efficiency of multichannel MPPT photovoltaic DC-to-AC converter under low-light condition can be improved.Compared to prior art, the present invention does not need the inversion unit controlling its both sides before closed D.C. contactor all to shut down, and therefore inverter complete machine power output can not be undergone mutation, and photovoltaic energy utilance during improve this is low.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is a kind of multichannel MPPT photovoltaic DC-to-AC converter structural representation disclosed in prior art;
Inversion unit group control method flow chart under Fig. 2 a kind of low-light condition disclosed in the embodiment of the present invention one;
Fig. 3 is a kind of three road MPPT photovoltaic DC-to-AC converter structural representations disclosed in prior art;
Fig. 4 is the inversion unit group control method flow chart under the embodiment of the present invention two another low-light condition disclosed;
Inversion unit group control method flow chart under Fig. 5 a kind of high light conditions disclosed in the embodiment of the present invention three;
Inversion unit group control method flow chart under Fig. 6 a kind of high light conditions disclosed in the embodiment of the present invention four;
Fig. 7 is a kind of cluster control unit structural representation disclosed in the embodiment of the present invention six;
Fig. 8 is a kind of DC current sensor installation site schematic diagram disclosed in the embodiment of the present invention six;
Fig. 9 is the embodiment of the present invention six another DC current sensor installation site schematic diagram disclosed.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one:
See Fig. 2, the embodiment of the present invention one discloses the inversion unit group control method under a kind of low-light condition, to realize under the prerequisite ensureing the conversion efficiency that multichannel MPPT photovoltaic DC-to-AC converter is higher, improve the photovoltaic energy utilance of described multichannel MPPT photovoltaic DC-to-AC converter, and reduce the sudden change of inverter output power when D.C. contactor disconnects and closes, comprising:
Step 11: the input voltage parameter obtaining each inversion unit in multichannel MPPT photovoltaic DC-to-AC converter;
Step 12: the running status regulating described inversion unit, until described inversion unit reaches identical input voltage, the size of this input voltage is determined by described input voltage parameter; Wherein, described identical input voltage can be the mean value of the input voltage parameter of above-mentioned inversion unit, maximum or minimum value, does not limit to;
Step 13: the D.C. contactor controlling to be connected across the DC side of often adjacent two described inversion units closes;
Step 14: the part inversion unit controlled in described inversion unit is shut down, all the other inversion units are operated in maximum power place.
The inversion unit that the present embodiment controls when illumination is more weak in multichannel MPPT photovoltaic DC-to-AC converter runs with identical input voltage; to realize the D.C. contactor two ends no-voltage difference (allowing certain error) being connected across connected two inversion unit DC side; so now closed described D.C. contactor would not produce impulse current again; be operated in maximum power place by the shutdown of control section inversion unit, all the other inversion units after this, the complete machine conversion efficiency of multichannel MPPT photovoltaic DC-to-AC converter under low-light condition can be improved.Compared to prior art, the present embodiment does not need the inversion unit controlling its both sides before closed D.C. contactor all to shut down, and therefore inverter complete machine power output can not be undergone mutation, and photovoltaic energy utilance during improve this is low.
Wherein, more by the quantity of the inversion unit of shutting down after closed D.C. contactor; the machine loss of described multichannel MPPT photovoltaic DC-to-AC converter under low-light condition is less; its conversion efficiency is also just corresponding higher; when only retaining an inversion unit after closed D.C. contactor and running, the complete machine conversion efficiency of described multichannel MPPT photovoltaic DC-to-AC converter under low-light condition reaches the highest.
In order to the technical scheme described in clearer description the present embodiment, be described for three road MPPT photovoltaic DC-to-AC converters shown in Fig. 3 below.
Described three road MPPT photovoltaic DC-to-AC converters comprise three can the inversion unit U1 ~ U3 of independent operating, and is connected across the D.C. contactor K1 ~ K2 of DC side of often adjacent two inversion units.Its operation principle is, when illumination is stronger, K1 ~ K2 disconnects, and U1 ~ U3 is independent operating under the power supply of photovoltaic array PV1 ~ PV3 respectively, carries out respective MPPT maximum power point tracking.When illumination is more weak, if U1 ~ U3 still runs, then the complete machine conversion efficiency of described three road MPPT photovoltaic DC-to-AC converters can be very low, therefore needs that control section inversion unit is shut down, all the other inversion units are operated in maximum power place under the centrally connected power supply of PV1 ~ PV3.
Concrete; when illumination is more weak; first the input voltage regulation of U1 ~ U3 is consistent by the present embodiment before closed K1 ~ K2; closed under the no-voltage difference of two ends to realize K1 ~ K2; part inversion unit afterwards again in control U1 ~ U3 is shut down, all the other inversion units carry out MPPT maximum power point tracking under the centrally connected power supply of PV1 ~ PV3, thus reduces power loss that inversion unit self brings, improves the conversion efficiency of three road MPPT photovoltaic DC-to-AC converters under low-light condition.Compared with prior art; the present embodiment without the need to before closed K1 ~ K2 first control U1 ~ U3 shut down; therefore inverter complete machine power output can not be suddenlyd change; moreover; due to the present embodiment without the need to before closed K1 ~ K2 first control U1 ~ U3 shut down; so also just restart without the need to control section inversion unit after closed K1 ~ K2, and re-start MPPT maximum power point tracking, the photovoltaic energy during therefore can making full use of this.
Embodiment two:
See Fig. 4, based on embodiment one, the present embodiment two discloses the inversion unit group control method under another low-light condition, comprising:
Step 41: the input voltage parameter obtaining each inversion unit in multichannel MPPT photovoltaic DC-to-AC converter;
Step 42: the running status regulating described inversion unit, with the input voltage making described inversion unit reach identical, the size of this input voltage is determined by described input voltage parameter;
Step 43: judge whether described inversion unit reaches identical input voltage within the first stipulated time; If so, enter step 44, otherwise enter step 46;
Step 44: the D.C. contactor controlling to be connected across the DC side of often adjacent two described inversion units closes;
Step 45: the part inversion unit controlled in described inversion unit is shut down, all the other inversion units are operated in maximum power place.
Step 46: generate and export failure alarm signal.
The present embodiment two is with the difference part of embodiment one, after the running status regulating described inversion unit, also judge whether described inversion unit reaches identical input voltage within the first stipulated time, if there is timeout case, then generate and export failure alarm signal, reminding staff's on-call maintenance.
Embodiment three:
See Fig. 5, the embodiment of the present invention three discloses the inversion unit group control method under a kind of high light conditions, to realize under the prerequisite ensureing the conversion efficiency that multichannel MPPT photovoltaic DC-to-AC converter is higher, improve the photovoltaic energy utilance of described multichannel MPPT photovoltaic DC-to-AC converter, and reduce the sudden change of inverter output power when D.C. contactor disconnects and closes, comprising:
Step 51: obtain the current parameters on the 1st D.C. contactor in multichannel MPPT photovoltaic DC-to-AC converter;
Step 52: the running status regulating the inversion unit in described multichannel MPPT photovoltaic DC-to-AC converter, until the current parameters on described 1st D.C. contactor is zero; Concrete, be zero (allowing certain error) by regulating the power output of each inversion unit to make the current parameters on described 1st D.C. contactor;
Step 53: control described 1st D.C. contactor and disconnect;
Step 54: the like, until last D.C. contactor in described multichannel MPPT photovoltaic DC-to-AC converter disconnects, control described inversion unit afterwards and be operated in respective maximum power place respectively.
The present embodiment regulates the running status of each inversion unit in multichannel MPPT photovoltaic DC-to-AC converter when illumination is stronger, disconnect under zero current to realize D.C. contactor one by one, avoid occurring D.C. contactor and cut off reverse current and the phenomenon damaged, being operated in respective maximum power place respectively by controlling described inversion unit after this, the complete machine conversion efficiency of multichannel MPPT photovoltaic DC-to-AC converter under high light conditions can be ensured.Compared to prior art, the present embodiment does not need all to shut down disconnecting the inversion unit controlling its both sides before D.C. contactor, and therefore inverter complete machine power output can not be undergone mutation, and photovoltaic energy utilance during improve this is low.
Embodiment four:
See Fig. 6, based on embodiment three, the embodiment of the present invention four discloses the inversion unit group control method under another high light conditions, comprising:
Step 61: obtain the current parameters on the 1st D.C. contactor in multichannel MPPT photovoltaic DC-to-AC converter;
Step 62: the running status regulating each inversion unit in described multichannel MPPT photovoltaic DC-to-AC converter, to make current parameters on described 1st D.C. contactor for zero;
Step 63: judge whether the current parameters in described first direct current contact reaches zero within the second stipulated time, if so, enters step 64, otherwise enters step 66;
Step 64: control described 1st D.C. contactor and disconnect;
Step 65: the like, until last D.C. contactor in described multichannel MPPT photovoltaic DC-to-AC converter disconnects, control described inversion unit afterwards and be operated in respective maximum power place respectively.
Step 66: generate and export failure alarm signal.
The embodiment of the present invention four is with the difference part of embodiment three, after the running status regulating the inversion unit in described multichannel MPPT photovoltaic DC-to-AC converter, also judge whether the current parameters in described first direct current contact reaches zero within the second stipulated time, if generation timeout case, then generate and export failure alarm signal, reminding staff's on-call maintenance.
Embodiment five:
The embodiment of the present invention five discloses a kind of inversion unit group control method, to realize under the prerequisite ensureing the conversion efficiency that multichannel MPPT photovoltaic DC-to-AC converter is higher, improve the photovoltaic energy utilance of described multichannel MPPT photovoltaic DC-to-AC converter, and reduce the sudden change of described multichannel MPPT photovoltaic DC-to-AC converter power output when D.C. contactor disconnects and closes, comprising:
When low-light environment being detected, perform the inversion unit group control method under low-light condition; When intense light irradiation environment being detected, perform the inversion unit group control method under high light conditions;
Wherein, the inversion unit group control method under described low-light condition comprises: the input voltage parameter obtaining each inversion unit in multichannel MPPT photovoltaic DC-to-AC converter; Regulate the running status of described inversion unit, until described inversion unit reaches identical input voltage, the size of this input voltage is determined by described input voltage parameter; The D.C. contactor controlling to be connected across the DC side of often adjacent two described inversion units closes; The part inversion unit controlled in described inversion unit is shut down, all the other inversion units are operated in maximum power place;
Inversion unit group control method under described high light conditions comprises: obtain the current parameters on the 1st D.C. contactor in multichannel MPPT photovoltaic DC-to-AC converter; Regulate the running status of each inversion unit in described multichannel MPPT photovoltaic DC-to-AC converter, until the current parameters on described 1st D.C. contactor is zero; Control described 1st D.C. contactor to disconnect; The like, until last D.C. contactor in described multichannel MPPT photovoltaic DC-to-AC converter disconnects, afterwards, control described inversion unit and be operated in respective maximum power place respectively.
The present embodiment five detects the change of illumination power automatically, thus switches the operating state of multichannel MPPT photovoltaic DC-to-AC converter in time, solves prior art Problems existing.Wherein, the power of illumination can judge according to the complete machine power output of multichannel MPPT photovoltaic DC-to-AC converter, but does not limit to.The more important thing is, compared with embodiment one to embodiment four, the present embodiment has concurrently by force/low-light condition under inversion unit group control method, therefore be under high light conditions or under low-light condition, there is not the sudden change of inverter complete machine power output, be more suitable for the large-sized photovoltaic power station larger on Network Voltage Stability impact.
Embodiment six:
See Fig. 7, the embodiment of the present invention six discloses a kind of cluster control unit, to realize under the prerequisite ensureing the conversion efficiency that multichannel MPPT photovoltaic DC-to-AC converter is higher, improve the photovoltaic energy utilance of described multichannel MPPT photovoltaic DC-to-AC converter, and reduce the sudden change of inverter output power when D.C. contactor disconnects and closes, comprising:
The first interface 71 be connected with D.C. contactor each in multichannel MPPT photovoltaic DC-to-AC converter;
The second interface 72 be connected with each inversion unit in described multichannel MPPT photovoltaic DC-to-AC converter
For receiving the 3rd interface 73 of the current parameters on described D.C. contactor;
And the main control unit 74 be connected with the 3rd interface 73 with first interface 71, second interface 72 respectively, for when low-light environment being detected, perform the inversion unit team control operation under low-light condition, and when intense light irradiation environment being detected, perform the inversion unit team control operation under high light conditions.
Wherein, the inversion unit team control operation under described low-light condition comprises: the input voltage parameter obtaining each inversion unit in multichannel MPPT photovoltaic DC-to-AC converter; Regulate the running status of described inversion unit, until described inversion unit reaches identical input voltage, the size of this input voltage is determined by described input voltage parameter; The D.C. contactor controlling to be connected across the DC side of often adjacent two described inversion units closes; The part inversion unit controlled in described inversion unit is shut down, all the other inversion units are operated in maximum power place.
Inversion unit team control operation under described high light conditions comprises: obtain the current parameters on the 1st D.C. contactor in multichannel MPPT photovoltaic DC-to-AC converter; Regulate the running status of each inversion unit in described multichannel MPPT photovoltaic DC-to-AC converter, until the current parameters on described 1st D.C. contactor is zero; Control described 1st D.C. contactor to disconnect; The like, until last D.C. contactor in described multichannel MPPT photovoltaic DC-to-AC converter disconnects, afterwards, control described inversion unit and be operated in respective maximum power place respectively.
It should be noted that, described cluster control unit can independently exist, and also can be used as functional module and is integrated in a certain inversion unit of multichannel MPPT photovoltaic DC-to-AC converter.
In addition, the present embodiment six also discloses a kind of group control system, comprising: for measuring the DC current sensor of the electric current in multichannel MPPT photovoltaic DC-to-AC converter on each D.C. contactor, and above-mentioned disclosed cluster control unit.Wherein, described DC current sensor can be connected on (as shown in Figure 8) on D.C. contactor, also can be arranged on the outlet side (as shown in Figure 9) of photovoltaic array.
In addition, the present embodiment six also discloses a kind of multichannel MPPT photovoltaic DC-to-AC converter, and it has above-mentioned any one group control system disclosed.
In addition, the present embodiment six also discloses a kind of photovoltaic system with above-mentioned multichannel MPPT photovoltaic DC-to-AC converter, and, a kind of photovoltaic system with multichannel MPPT photovoltaic DC-to-AC converter and above-mentioned group control system.
In sum; the inversion unit that the present invention controls when illumination is more weak in multichannel MPPT photovoltaic DC-to-AC converter runs with identical input voltage; poor with the D.C. contactor two ends no-voltage realizing being connected across connected two inversion unit DC side; so now closed described D.C. contactor would not produce impulse current again; be operated in maximum power place by the shutdown of control section inversion unit, all the other inversion units after this, the complete machine conversion efficiency of multichannel MPPT photovoltaic DC-to-AC converter under low-light condition can be improved.Compared to prior art, the present invention does not need the inversion unit controlling its both sides before closed D.C. contactor all to shut down, and therefore inverter complete machine power output can not be undergone mutation, and the photovoltaic energy utilance during improve this.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For cluster control unit, group control system, multichannel MPPT photovoltaic DC-to-AC converter and photovoltaic system disclosed in embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates see method part.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. the inversion unit group control method under low-light condition, is characterized in that, comprising:
Obtain the input voltage parameter of each inversion unit in multichannel MPPT photovoltaic DC-to-AC converter;
Regulate the running status of described inversion unit, until described inversion unit reaches identical input voltage, the size of this input voltage is determined by described input voltage parameter;
The D.C. contactor controlling to be connected across the DC side of often adjacent two described inversion units closes;
The part inversion unit controlled in described inversion unit is shut down, all the other inversion units are operated in maximum power place.
2. method according to claim 1, is characterized in that, after the running status of the described inversion unit of described adjustment, also comprises:
If described inversion unit does not reach identical input voltage within the first stipulated time, then generate and export failure alarm signal.
3. the inversion unit group control method under high light conditions, is characterized in that, comprising:
Obtain the current parameters on the 1st D.C. contactor in multichannel MPPT photovoltaic DC-to-AC converter;
Regulate the running status of each inversion unit in described multichannel MPPT photovoltaic DC-to-AC converter, until the current parameters on described 1st D.C. contactor is zero;
Control described 1st D.C. contactor to disconnect;
The like, until last D.C. contactor in described multichannel MPPT photovoltaic DC-to-AC converter disconnects, afterwards, control described inversion unit and be operated in respective maximum power place respectively.
4. method according to claim 3, is characterized in that, in described adjustment described multichannel MPPT photovoltaic DC-to-AC converter each inversion unit running status after, also comprise:
If the current parameters in described first direct current contact does not reach zero within the second stipulated time, then generate and export failure alarm signal.
5. an inversion unit group control method, is characterized in that, comprising:
When low-light environment being detected, perform the inversion unit group control method under low-light condition; And when intense light irradiation environment being detected, perform the inversion unit group control method under high light conditions;
Wherein, the inversion unit group control method under described low-light condition comprises: the input voltage parameter obtaining each inversion unit in multichannel MPPT photovoltaic DC-to-AC converter; Regulate the running status of described inversion unit, until described inversion unit reaches identical input voltage, the size of this input voltage is determined by described input voltage parameter; The D.C. contactor controlling to be connected across the DC side of often adjacent two described inversion units closes; The part inversion unit controlled in described inversion unit is shut down, all the other inversion units are operated in maximum power place;
Inversion unit group control method under described high light conditions comprises: obtain the current parameters on the 1st D.C. contactor in multichannel MPPT photovoltaic DC-to-AC converter; Regulate the running status of each inversion unit in described multichannel MPPT photovoltaic DC-to-AC converter, until the current parameters on described 1st D.C. contactor is zero; Control described 1st D.C. contactor to disconnect; The like, until last D.C. contactor in described multichannel MPPT photovoltaic DC-to-AC converter disconnects, afterwards, control described inversion unit and be operated in respective maximum power place respectively.
6. a cluster control unit, is characterized in that, comprising:
The first interface be connected with D.C. contactor each in multichannel MPPT photovoltaic DC-to-AC converter;
The second interface be connected with each inversion unit in described multichannel MPPT photovoltaic DC-to-AC converter
For receiving the 3rd interface of the current parameters on described D.C. contactor;
And the main control unit be connected with the 3rd interface with described first interface, the second interface respectively, for when low-light environment being detected, perform the inversion unit team control operation under low-light condition, and when intense light irradiation environment being detected, perform the inversion unit team control operation under high light conditions;
Wherein, the inversion unit team control operation under described low-light condition comprises: the input voltage parameter obtaining each inversion unit in multichannel MPPT photovoltaic DC-to-AC converter; Regulate the running status of described inversion unit, until described inversion unit reaches identical input voltage, the size of this input voltage is determined by described input voltage parameter; The D.C. contactor controlling to be connected across the DC side of often adjacent two described inversion units closes; The part inversion unit controlled in described inversion unit is shut down, all the other inversion units are operated in maximum power place;
Inversion unit team control operation under described high light conditions comprises: obtain the current parameters on the 1st D.C. contactor in multichannel MPPT photovoltaic DC-to-AC converter; Regulate the running status of each inversion unit in described multichannel MPPT photovoltaic DC-to-AC converter, until the current parameters on described 1st D.C. contactor is zero; Control described 1st D.C. contactor to disconnect; The like, until last D.C. contactor in described multichannel MPPT photovoltaic DC-to-AC converter disconnects, afterwards, control described inversion unit and be operated in respective maximum power place respectively.
7. a group control system, is characterized in that, comprising: for measuring the DC current sensor of the electric current in multichannel MPPT photovoltaic DC-to-AC converter on each D.C. contactor, and cluster control unit according to claim 6.
8. a multichannel MPPT photovoltaic DC-to-AC converter, is characterized in that, described multichannel MPPT photovoltaic DC-to-AC converter has group control system according to claim 7.
9. a photovoltaic system, is characterized in that, comprises multichannel MPPT photovoltaic DC-to-AC converter according to claim 8.
10. a photovoltaic system, is characterized in that, comprises multichannel MPPT photovoltaic DC-to-AC converter and group control system according to claim 7.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101488668A (en) * | 2008-04-30 | 2009-07-22 | 江苏南自通华新能源电力有限公司 | Reconfigurable distributed access grid-connected inverter |
| CN203707805U (en) * | 2013-06-25 | 2014-07-09 | 江苏新通达电子科技股份有限公司 | Charger |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101488668A (en) * | 2008-04-30 | 2009-07-22 | 江苏南自通华新能源电力有限公司 | Reconfigurable distributed access grid-connected inverter |
| CN203707805U (en) * | 2013-06-25 | 2014-07-09 | 江苏新通达电子科技股份有限公司 | Charger |
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