CN103107556B - The energy adjusting method of inverter, inverter and energy adjustment system thereof - Google Patents
The energy adjusting method of inverter, inverter and energy adjustment system thereof Download PDFInfo
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- CN103107556B CN103107556B CN201310019289.7A CN201310019289A CN103107556B CN 103107556 B CN103107556 B CN 103107556B CN 201310019289 A CN201310019289 A CN 201310019289A CN 103107556 B CN103107556 B CN 103107556B
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Abstract
The embodiment of the present invention provides a kind of energy adjusting method of inverter, inverter and energy adjustment system thereof, wherein the energy adjusting method of inverter comprises: the information about power receiving the inflow electrical network detected by described electric quantity detection apparatus from the electric quantity detection apparatus be connected with described inverter, according to the peak power output limit value of described information about power adjustment inverter.Present invention achieves electric energy that inverter sends all or the overwhelming majority by the object of load consumption, achieve effective utilization of energy.
Description
Technical field
The present invention relates to inversion transformation technique, more particularly, relate to the energy adjusting method of inverter, inverter and energy adjustment system thereof.
Background technology
Inverter is divided into grid-connected and from two kinds, net, and wherein the application of grid type inverter (as photovoltaic combining inverter) is more extensive, and system configuration cost is also relatively low.At present, grid company has index request to the electric power be connected to the grid, and comprises power factor and harmonic wave etc., to avoid polluting electrical network; If do not obtain the grid-connected license of electrical network, the excrescent electric power that then inverter sends does not allow to flow into electrical network, only allow to carry out generating power for their own use of electric power, for this situation, can adopt at present from net scheme, use the energy storage devices such as storage battery to store the excrescent electric power that inverter sends, but this can increase the input cost of inverter system undoubtedly, there is the problem that capacity usage ratio reduces simultaneously.
Inventor is realizing finding in process of the present invention: the index request of grid company during in order to meet grid-connected, consider the Cost Problems of inverter system simultaneously, the electric energy that inverter sends all or the overwhelming majority fallen by load consumption, flow into electrical network to avoid excrescent electric power, electrical network impacted as optimum treatment mode.But the energy adjusting scheme not for the inverter of this processing mode in prior art, be therefore badly in need of the energy adjusting scheme providing a kind of inverter at present, thus the electric energy that inverter can be made to send is whole or the overwhelming majority is fallen by load consumption.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of energy adjusting method of inverter, inverter and energy adjustment system, with realize electric energy that inverter sends all or the overwhelming majority by load consumption, flow into electrical network, to the object that electrical network impacts to avoid excrescent electric power.
For achieving the above object, the embodiment of the present invention provides following technical scheme:
An energy adjusting method for inverter, described method comprises:
The information about power of the inflow electrical network detected by described electric quantity detection apparatus is received from the electric quantity detection apparatus be connected with described inverter, before described electric quantity detection apparatus is arranged at the grid-connected input of electrical network, described grid-connected input refers to that inverter inputs port corresponding to energy to electrical network;
The information about power of the inflow electrical network detected by described electric quantity detection apparatus, judge to flow into the electricity of electrical network be on the occasion of or negative value;
If flow into the electricity of electrical network be on the occasion of, then reduce the peak power output limit value of described inverter.
Preferably, the step of the peak power output limit value of the described inverter of described reduction specifically comprises:
Judge whether the electricity flowing into electrical network is greater than first threshold;
If the electricity flowing into electrical network is greater than described first threshold, then the peak power output limit value of described inverter is reduced the first preset value;
If the electricity flowing into electrical network is not more than described first threshold, or after described first preset value of peak power output limit value reduction of described inverter, then judge whether the electricity of current inflow electrical network is greater than Second Threshold;
If the electricity of current inflow electrical network is greater than described Second Threshold, then the current peak power output limit value of described inverter is reduced the second preset value.
Preferably, describedly judge the electricity of current inflow electrical network also comprises after whether being greater than the step of Second Threshold:
If the electricity of current inflow electrical network is not more than described Second Threshold, or after the current peak power output of described inverter reduces the second preset value, then judge whether the current peak power output limit value of described inverter is less than default power output minimum value;
If the current peak power output limit value of described inverter is less than default power output minimum value, then adjusting described inverter current peak power output limit value is described default power output minimum value;
If the current peak power output limit value of described inverter is not less than default power output minimum value, then the current peak power output limit value maintaining described inverter is constant.
Preferably, described judge to flow into the electricity of electrical network be on the occasion of or the step of negative value after also comprise:
If the electricity flowing into electrical network is negative value, then increase the peak power output limit value of described inverter.
Preferably, the step of the peak power output limit value of the described inverter of described increase specifically comprises:
Judge whether the electricity flowing into electrical network is less than the 3rd threshold value;
If the electricity flowing into electrical network is less than described 3rd threshold value, then the current peak power output limit value of described inverter is increased the 3rd preset value;
If the electricity flowing into electrical network is not less than described 3rd threshold value, or after described 3rd preset value of peak power output limit value increase of described inverter, then judge whether the electricity of current inflow electrical network is less than the 4th threshold value;
If the electricity of current inflow electrical network is less than described 4th threshold value, then the current peak power output limit value of described inverter is increased the 4th preset value.
Preferably, describedly judge the electricity of current inflow electrical network also comprises after whether being less than the step of the 4th threshold value:
If the electricity of current inflow electrical network is not less than described 4th threshold value, or after described 4th preset value of current peak power output limit value increase of described inverter, then judge whether the current peak power output limit value of described inverter is greater than default rated output power;
If the current peak power output limit value of described inverter is greater than default rated output power, then adjusting described inverter current peak power output limit value is described default rated output power;
If the current peak power output limit value of described inverter is not more than default rated output power, then the current peak power output limit value maintaining described inverter is constant.
The embodiment of the present invention also provides a kind of inverter, and described inverter comprises:
Information about power receiver module, for receiving the information about power of the inflow electrical network detected by described electric quantity detection apparatus from the electric quantity detection apparatus be connected with described inverter, before described electric quantity detection apparatus is arranged at the grid-connected input of electrical network, described grid-connected input refers to that inverter inputs port corresponding to energy to electrical network;
Power output limit value adjusting module, for adjusting the peak power output limit value of described inverter according to described information about power;
Described power output limit value adjusting module comprises:
Positive and negative values judging unit, for judge to flow into according to described information about power the electricity of electrical network be on the occasion of or negative value;
First power limit adjustment unit, for judge at described positive and negative values judging unit flow into electrical network electricity as on the occasion of time, reduce the peak power output limit value of described inverter.
Preferably, described first power limit adjustment unit comprises:
First judgment sub-unit, for judging whether the electricity flowing into electrical network is greater than first threshold;
First power limit reduces subelement, for when the judged result of described first judgment sub-unit is for being, the peak power output limit value of described inverter is reduced the first preset value;
Second judgment sub-unit, for when the judged result of described first judgment sub-unit is no, or described first power limit reduces subelement by after described first preset value of the peak power output limit value of described inverter reduction, judges whether the electricity of current inflow electrical network is greater than Second Threshold;
Second power limit reduces subelement, for when the judged result of described second judgment sub-unit is for being, the current peak power output limit value of described inverter is reduced the second preset value.
Preferably, described first power limit adjustment unit also comprises:
3rd judgment sub-unit, for when the judged result of described second judgment sub-unit is no, or described second power limit reduces subelement by after described second preset value of current peak power output limit value reduction of described inverter, judges whether the current peak power output limit value of described inverter is less than default power output minimum value;
First adjustment subelement, for when the judged result of described 3rd judgment sub-unit is for being, adjusting described inverter current peak power output limit value is described default power output minimum value;
First maintains subelement, and for when the judged result of described 3rd judgment sub-unit is no, the current peak power output limit value maintaining described inverter is constant.
Preferably, described power output limit value adjusting module also comprises:
Second power limit adjustment unit, when being negative value for judging to flow into the electricity of electrical network at described positive and negative values judging unit, increases the peak power output of described inverter.
Preferably, described second power limit adjustment unit comprises:
4th judgment sub-unit, for when the electricity of inflow electrical network is negative value, judges whether the electricity flowing into electrical network is less than the 3rd threshold value;
First power limit increases subelement, for when the judged result of described 4th judgment sub-unit is for being, the current peak power output limit value of described inverter is increased the 3rd preset value;
5th judgment sub-unit, for when the judged result of described 4th judgment sub-unit is no, or described first power limit increases subelement by after described 3rd preset value of current peak power output limit value increase of described inverter, judges whether the electricity of current inflow electrical network is less than the 4th threshold value;
Second power limit increases subelement, for when the judged result of described 5th judgment sub-unit is for being, the current peak power output limit value of described inverter is increased the 4th preset value.
Preferably, described second power limit adjustment unit also comprises:
6th judgment sub-unit, for when the judged result of described 5th judgment sub-unit is no, or described second power limit increases subelement by after described 4th preset value of current peak power output limit value increase of described inverter, judges whether the current peak power output limit value of described inverter is greater than default rated output power;
Second adjustment subelement, for when the judged result of described 6th judgment sub-unit is for being, adjusting described inverter current peak power output limit value is described default rated output power;
Second maintains subelement, and for when the judged result of described 6th judgment sub-unit is no, the current peak power output limit value maintaining described inverter is constant.
The embodiment of the present invention also provides a kind of energy adjustment system of inverter, comprising: solar array device, inverter as above, and electric quantity detection apparatus;
Wherein, before described electric quantity detection apparatus is arranged at the grid-connected input of electrical network, for detecting the information about power of inflow electrical network and sending described information about power to described inverter, described inverter adjusts the peak power output limit value of described inverter according to described information about power.
Based on technique scheme, the energy adjusting method of the inverter that the embodiment of the present invention provides, inverter receives the information about power of the inflow electrical network detected by described electric quantity detection apparatus from the electric quantity detection apparatus be connected with described inverter, thus by this information about power, the peak power output limit value of adjustment inverter, thus the electric energy making inverter send is whole or the overwhelming majority is fallen by load consumption, avoids excrescent electric power and flow into electrical network, to the problem that electrical network impacts.The energy adjusting method of the inverter that the embodiment of the present invention provides achieve electric energy that inverter sends all or the overwhelming majority by the object of load consumption, achieve effective utilization of energy.
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 some embodiments of the present 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 these accompanying drawings.
The flow chart of the energy adjusting method of a kind of inverter that Fig. 1 provides for the embodiment of the present invention;
The electric quantity detection apparatus that Fig. 2 provides for the embodiment of the present invention schematic diagram is set;
The method flow diagram of the inverter energy adjustment that Fig. 3 provides for the embodiment of the present invention;
The other method flow chart of the inverter energy adjustment that Fig. 4 provides for the embodiment of the present invention;
The another method flow diagram of the inverter energy adjustment that Fig. 5 provides for the embodiment of the present invention;
A method flow diagram again of the inverter energy adjustment that Fig. 6 provides for the embodiment of the present invention;
The method flow diagram more again of the inverter energy adjustment that Fig. 7 provides for the embodiment of the present invention;
The structured flowchart of the inverter that Fig. 8 provides for the embodiment of the present invention;
The hardware structure diagram of the inverter that Fig. 9 provides for the embodiment of the present invention;
The structured flowchart of the power output limit value adjusting module that Figure 10 provides for the embodiment of the present invention;
The structured flowchart of the first power limit adjustment unit that Figure 11 provides for the embodiment of the present invention;
Another structured flowchart of the first power limit adjustment unit that Figure 12 provides for the embodiment of the present invention;
The structured flowchart of the second power limit adjustment unit that Figure 13 provides for the embodiment of the present invention;
Another structured flowchart of the second power limit adjustment unit that Figure 14 provides for the embodiment of the present invention;
The structural representation of the energy adjustment system of the inverter that Figure 15 provides for the embodiment of the present invention.
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.
The flow chart of the energy adjusting method of a kind of inverter that Fig. 1 provides for the embodiment of the present invention, the method is applied to inverter, and with reference to Fig. 1, the method can comprise step S100 and step S200.
Step S100, from the electric quantity detection apparatus be connected with inverter, receive the information about power of the inflow electrical network detected by described electric quantity detection apparatus.
Wherein, information about power is by the electric quantity detection apparatus collection before the grid-connected input being arranged at electrical network and send, electric quantity detection apparatus sampling flows into the electricity of electrical network, after obtaining the charge value flowing into electrical network, the encapsulation combination of data is carried out with current value, generate the information about power that this charge value is corresponding, and this information about power is sent to inverter.Wherein electric quantity detection apparatus schematic diagram is set with reference to shown in Fig. 2.
Refer to Fig. 2, the electric quantity detection apparatus provided for the embodiment of the present invention schematic diagram is set, electric quantity detection apparatus is arranged between inverter and electrical network, detect the energy of inverter input electrical network, and the energy that electrical network exports, grid-connected input herein refers to that inverter inputs port corresponding to energy to electrical network; After electric quantity detection apparatus detects the electricity flowing into electrical network, generate corresponding information about power, send this information about power to inverter, so that inverter realizes the energy adjusting method of the inverter that the embodiment of the present invention provides.
Please continue to refer to Fig. 1, step S200, adjust the peak power output limit value of described inverter according to described information about power.
The information about power that the electricity of the inflow electrical network arrived by real-time reception is corresponding, controlling and adjustment can be carried out to the peak power output limit value of inverter, thus make the output electricity of inverter corresponding with the electricity of described inflow electrical network, optionally, the adjustment of the peak power output limit value of the inverter undertaken by step S200, the electricity of current inflow electrical network is preferably zero, and the electricity of inflow electrical network is zero is a kind of ideal state.
For the embodiment of the present invention, namely the output electricity of inverter is corresponding with the electricity of described inflow electrical network refers to, if the electricity of current inflow electrical network is on the occasion of (inverter inputs electricity to electrical network), then reduce the output electricity of inverter, namely the embodiment directly perceived of the output electricity reduction of inverter reduces a peak power output limit value for inverter, and the output electricity reduced can make the electricity flowing into electrical network be zero; If the electricity of current inflow electrical network is negative value (electrical network outwards exports electricity, is load supplying), then increase the output electricity of inverter, namely a kind of embodiment directly perceived of output electricity increase of inverter increases the peak power output limit value of inverter, the output electricity increased should meet the power demands of load, preferably makes the output electricity of electrical network be zero.
Obviously, the embodiment of the present invention can only consider the electricity of current inflow electrical network be on the occasion of situation, namely the electricity of current inflow electrical network be on the occasion of time, reduce the power output limit value of inverter, make the electricity flowing into electrical network be zero.The electricity flowing into electrical network is negative value, can think a kind of stable state of grid-connected electricity.
Certainly, for the embodiment of the present invention, it is ideal that load power is supplied by inverter entirely, and therefore when the electricity flowing into electrical network is negative value, the embodiment of the present invention also can increase the output electricity limit value of inverter, makes the output electricity of electrical network be zero.
The energy adjusting method of the inverter that the embodiment of the present invention provides, by the information about power that the electricity receiving inflow electrical network is corresponding, described information about power is by the electric quantity detection apparatus collection before the grid-connected input being arranged at electrical network and send, thus by this information about power, the peak power output limit value of adjustment inverter, make the output electricity of inverter corresponding with the electricity of described inflow electrical network, thus the electric energy making inverter send is whole or the overwhelming majority is fallen by load consumption, avoid excrescent electric power and flow into electrical network, to the problem that electrical network impacts.The energy adjusting method of the inverter that the embodiment of the present invention provides achieve electric energy that inverter sends all or the overwhelming majority by the object of load consumption, achieve effective utilization of energy.
Already described above, when flow into the electricity of electrical network be on the occasion of time, information about power that can be corresponding according to the electricity of the inflow electrical network received, reduce the peak power output limit value of inverter, make the output electricity of inverter corresponding with the electricity of described inflow electrical network, to make the electricity of current inflow electrical network for zero, the electricity of the described inflow electrical network of indication herein, for the peak power output limit value carrying out inverter reduce time, the electricity of corresponding inflow electrical network.Fig. 3 shows the implementation of this situation, the method flow diagram of the inverter energy adjustment that Fig. 3 provides for the embodiment of the present invention, and with reference to Fig. 3, the method can comprise:
Step S210, judge whether flow into the electricity of electrical network is greater than first threshold, if so, perform step S211, if not, perform step S212;
Step S211, the peak power output limit value of inverter is reduced the first preset value, perform step S212;
Step S212, judge whether the electricity of current inflow electrical network is greater than Second Threshold, if so, perform step S213, if not, process ends;
Flowing into the electricity of electrical network is real-time update, for the embodiment of the present invention, if the judged result in step S210 is no, then think that the electricity of current inflow electrical network described in step S212 is consistent with the electricity of the inflow electrical network described in step S210, if but the judged result in step S210 is yes, then think that the electricity of the current inflow electrical network described in step S212 is the electricity of inflow electrical network corresponding after the peak power output limit value of inverter being reduced the first preset value, due to the change of peak power output limit value, also there is change numerically in the electricity of inflow electrical network.
Step S213, the current peak power output limit value of inverter is reduced the second preset value.
The mode that the embodiment of the present invention is adjusted by segmentation, the peak power output limit value of inverter is adjusted, the adjustment of the peak power output limit value of segmentation is implemented according to actual conditions, the power of inverter is adjusted more accurate, the first threshold related in the embodiment of the present invention, Second Threshold, first preset value, second preset value is select according to actual inverter system debug, and so there is no fixed value, visual concrete service condition is arranged.
Optionally, consider inverter own loss, inverter be made to keep running status, and peak power output limit value should not be less than inverter output power minimum value.To this, Fig. 4 shows the other method flow process of the inverter energy adjustment that the embodiment of the present invention provides, and after shown in composition graphs 3 and Fig. 4, method shown in Fig. 4 is no in the judged result of the step S212 of Fig. 3, step S213 performs, also comprises step S214-S216.
Step S214, judge whether the current peak power output limit value of inverter is less than default power output minimum value, if so, perform step S215, if not, perform step S216;
Step S215, adjustment inverter current peak power output limit value are described default power output minimum value;
The current peak power output limit value of step S216, maintenance inverter is constant.
Wherein, the current peak power output limit value of the inverter maintained is the peak power output limit value that step S214 is corresponding when judging, it may be the peak power output limit value after step S213 adjustment, also may be the peak power output limit value etc. after step S211 adjustment.
Already described above, when the electricity flowing into electrical network is negative value, information about power that can be corresponding according to the electricity of the inflow electrical network received, increases the peak power output limit value of inverter, make the output electricity of inverter corresponding with the electricity of described inflow electrical network, to make the electricity of inflow electrical network for zero.Fig. 5 shows the implementation of this situation, the another method flow diagram of the inverter energy adjustment that Fig. 5 provides for the embodiment of the present invention, and with reference to Fig. 5, the method can comprise:
Step S220, judge that whether flow into the electricity of electrical network is less than the 3rd threshold value, if so, performs step S221, if not, perform step S222;
Step S221, the current peak power output limit value of inverter is increased the 3rd preset value;
Step S222, judge whether the electricity of current inflow electrical network is less than the 4th threshold value, if so, perform step S223, if not, process ends;
Step S223, the current peak power output limit value of inverter is increased the 4th preset value.
The mode that the embodiment of the present invention is adjusted by segmentation, the peak power output limit value of inverter is adjusted, the adjustment of the peak power output limit value of segmentation is implemented according to actual conditions, the power of inverter is adjusted more accurate, the 3rd threshold value related in the embodiment of the present invention, the 4th threshold value, 3rd preset value, 4th preset value is select according to actual inverter system debug, and so there is no fixed value, visual concrete service condition is arranged.
Optionally, consider that the maximum operate power of inverter is for its rated power, therefore peak power output limit value should not exceed rated power.To this, Fig. 6 shows a method flow again of the inverter energy adjustment that the embodiment of the present invention provides, and shown in composition graphs 5 and Fig. 6, the judged result that Fig. 6 institute is shown in the step S222 of Fig. 5 is no, after step S223 execution, also comprise step S224-S226.
Step S224, judge whether the current peak power output limit value of inverter is greater than default rated output power, if so, perform step S225, if not, perform step S226;
Step S225, adjustment inverter current peak power output limit value are described default rated output power;
The current peak power output limit value of step S226, maintenance inverter is constant.
Really, the embodiment of the present invention can consider that the electricity flowing into electrical network is on the occasion of the situation with negative value simultaneously, by the electricity positive and negative values that the information about power that the electricity of the inflow electrical network received is corresponding is corresponding, realize different processing procedures, Fig. 7 shows the method flow more again of the inverter energy adjustment that the embodiment of the present invention provides, ginseng Fig. 7, the method can comprise:
Step S201, the electricity judging to flow into electrical network according to described information about power be on the occasion of or negative value, if on the occasion of, if perform step S210 negative value, perform step S220;
Step S210, judge whether flow into the electricity of electrical network is greater than first threshold, if so, perform step S211, if not, perform step S212;
Step S211, the peak power output limit value of inverter is reduced the first preset value, perform step S212;
Step S212, judge whether the electricity of current inflow electrical network is greater than Second Threshold, if so, perform step S213, if not, perform step S214;
Step S213, the current peak power output limit value of inverter is reduced the second preset value, perform step S214;
Step S214, judge whether the current peak power output limit value of inverter is less than default power output minimum value, if so, perform step S215, if not, perform step S216;
Step S215, adjustment inverter current peak power output limit value are described default power output minimum value;
The current peak power output limit value of step S216, maintenance inverter is constant;
Step S220, judge that whether flow into the electricity of electrical network is less than the 3rd threshold value, if so, performs step S221, if not, perform step S222;
Step S221, the current peak power output limit value of inverter is increased the 3rd preset value;
Step S222, judge whether the electricity of current inflow electrical network is less than the 4th threshold value, if so, perform step S223, if not, perform step S224;
Step S223, the current peak power output limit value of inverter is increased the 4th preset value, perform step S224;
Step S224, judge whether the current peak power output limit value of inverter is greater than default rated output power, if so, perform step S225, if not, perform step S226;
Step S225, adjustment inverter current peak power output limit value are described default rated output power;
The current peak power output limit value of step S226, maintenance inverter is constant.
The energy adjusting method of the inverter that the embodiment of the present invention provides, by the information about power that the electricity of the inflow electrical network received is corresponding, described information about power is by the electric quantity detection apparatus collection before the grid-connected input being arranged at electrical network and send, the peak power output limit value of adjustment inverter, make the output electricity of described inverter corresponding with the electricity of described inflow electrical network, to make the electricity of current inflow electrical network for zero, achieve electric energy that inverter sends all or the overwhelming majority by the object of load consumption.
Be described the inverter that the embodiment of the present invention provides below, it should be noted that inverter described below is corresponding with the energy adjusting method of above-described inverter, both can be cross-referenced.
The structured flowchart of the inverter that Fig. 8 provides for the embodiment of the present invention, with reference to Fig. 8, inverter can comprise:
Information about power receiver module 100, for receiving the information about power of the inflow electrical network detected by described electric quantity detection apparatus from the electric quantity detection apparatus be connected with described inverter; Wherein, described information about power is by the electric quantity detection apparatus collection before the grid-connected input being arranged at electrical network and send, namely electric quantity detection apparatus sampling flows into the electricity of electrical network, after obtaining the charge value flowing into electrical network, the encapsulation combination of data is carried out with this current value, generate the information about power that this charge value is corresponding, and this information about power is sent to inverter;
Power output limit value adjusting module 110, for adjusting the peak power output limit value of described inverter according to described information about power.
Concrete, by the peak power output limit value of the inverter circuit in adjustment inverter, thus realize the adjustment of the peak power output limit value of inverter.With reference to the hardware structure diagram of the inverter that Fig. 9, Fig. 9 provide for the embodiment of the present invention, comprise controller 21, DC/DC change-over circuit 22, the inverter circuit 23 be connected with described DC/DC change-over circuit by DC bus; Wherein, information about power receiver module 100 and power output limit value adjusting module 110 can be arranged in controller 21.
Preferably, after the adjustment of peak power output limit value that power output limit value adjusting module 110 carries out inverter, the output electricity of described inverter should be corresponding with the electricity of described inflow electrical network, makes the electricity of current inflow electrical network be zero.
Figure 10 shows the structure of power output limit value adjusting module 110, and power output limit value adjusting module 110 can comprise:
Positive and negative values judging unit 1101, for the information about power corresponding according to the electricity of described inflow electrical network, judge to flow into the electricity of electrical network be on the occasion of or negative value;
First power limit adjustment unit 111, for flow into the electricity of electrical network be on the occasion of time, according to the peak power output limit value of described information about power reduction inverter, make the output electricity of inverter corresponding with the electricity of described inflow electrical network;
Second power limit adjustment unit 112, for when the electricity of inflow electrical network is negative value, according to described information about power, increases the peak power output of inverter, makes the output electricity of inverter corresponding with the electricity of described inflow electrical network.
Obviously, power output limit value adjusting module 110 also can comprise the first power limit adjustment unit 111, or in the second power limit adjustment unit 112 one.
Figure 11 shows the structure of the first power limit adjustment unit 111, and the first power limit adjustment unit 111 can comprise:
First judgment sub-unit 1111, for flow into the electricity of electrical network be on the occasion of time, judge whether the electricity of inflow electrical network is greater than first threshold;
First power limit reduces subelement 1112, for when the judged result of the first judgment sub-unit 1111 is for being, the peak power output limit value of inverter is reduced the first preset value;
Second judgment sub-unit 1113, for when the judged result of the first judgment sub-unit 1111 is no, or first power limit reduce after the peak power output limit value of inverter reduces the first preset value by subelement 1112, to judge whether the electricity of current inflow electrical network is greater than Second Threshold;
Second power limit reduces subelement 1114, for when the judged result of the second judgment sub-unit 1113 is for being, the current peak power output limit value of inverter is reduced the second preset value.
Show another structure of the first power limit adjustment unit 111 in conjunction with Figure 11 and Figure 12, Figure 12, compare the first power limit adjustment unit 111, Figure 12 shown in Figure 11 and also comprise:
3rd judgment sub-unit 1115, for when the judged result of the second judgment sub-unit 1113 is no, or second power limit reduce after the current peak power output limit value of inverter reduces the second preset value by subelement 1114, to judge whether the current peak power output limit value of inverter is less than default power output minimum value;
First adjustment subelement 1116, for when the judged result of the 3rd judgment sub-unit 1115 is for being, adjustment inverter current peak power output limit value is described default power output minimum value;
First maintains subelement 1117, and for when the judged result of the 3rd judgment sub-unit 1115 is no, the current peak power output limit value maintaining inverter is constant.
Figure 13 shows the structure of the second power limit adjustment unit 112, and the second power limit adjustment unit 112 can comprise:
4th judgment sub-unit 1121, for when the electricity of inflow electrical network is negative value, judges whether the electricity flowing into electrical network is less than the 3rd threshold value;
First power limit increases subelement 1122, for when the judged result of the 4th judgment sub-unit 1121 is for being, the current peak power output limit value of inverter is increased the 3rd preset value;
5th judgment sub-unit 1123, for being no in the judged result of the 4th judgment sub-unit 1121, or first power limit increase after the current peak power output limit value of inverter increases the 3rd preset value by subelement 1122, judge whether the electricity of current inflow electrical network is less than the 4th threshold value;
Second power limit increases subelement 1124, for when the judged result of the 5th judgment sub-unit 1123 is for being, the current peak power output limit value of inverter is increased the 4th preset value.
Show another structure of the second power limit adjustment unit 112 in conjunction with Figure 13 and Figure 14, Figure 14, compare the second power limit adjustment unit 112, Figure 14 shown in Figure 13 and also comprise:
6th judgment sub-unit 1125, for when the judged result of the 5th judgment sub-unit 1123 is no, or second power limit increase after the current peak power output limit value of inverter increases the 4th preset value by subelement 1124, judge whether the current peak power output limit value of inverter is greater than default rated output power;
Second adjustment subelement 1126, for when the judged result of the 6th judgment sub-unit 1125 is for being, adjustment inverter current peak power output limit value is described default rated output power;
Second maintains subelement 1127, and for when the judged result of the 6th judgment sub-unit 1125 is no, the current peak power output limit value maintaining inverter is constant.
The inverter that the embodiment of the present invention provides, achieve electric energy that inverter sends all or the overwhelming majority fallen by load consumption, achieve effective utilization of energy.
Be described the energy adjustment system of the inverter that the embodiment of the present invention provides below, it should be noted that the energy adjustment system of inverter described below and the energy adjusting method of above-described inverter, and inverter is corresponding, three can be cross-referenced.。
The structural representation of the energy adjustment system of the inverter that Figure 15 provides for the embodiment of the present invention, with reference to Figure 15, this system can comprise: solar array device 1, inverter 2 and electric quantity detection apparatus 3; Wherein, inverter 2 can comprise: controller 21, DC/DC circuit 22, inverter circuit 23.
Wherein, before electric quantity detection apparatus 3 is arranged at the grid-connected input of electrical network, for detecting the electricity flowing into electrical network, generates corresponding information about power, and sending described information about power to inverter 2;
Electric quantity detection apparatus 3 can be the device arbitrarily with electrical measurement function, and it at least should comprise the electric quantity detecting circuit of detection of grid side electricity, for the treatment of the signal processor collecting electric quantity signal, with for carrying out the communicating circuit of communication with inverter.
Inverter 2, for receiving the information about power of the inflow electrical network detected by electric quantity detection apparatus 3 from electric quantity detection apparatus 3, according to the peak power output limit value of described information about power adjustment inverter, thus make the output electricity of inverter corresponding with the electricity of described inflow electrical network, preferably make the electricity of current inflow electrical network be zero.
Concrete, it can be the information about power that controller 21 in inverter 2 receives the inflow electrical network detected by described electric quantity detection apparatus, according to the peak power output limit value of described information about power adjustment inverter circuit 23, thus realize the object of the peak power output limit value of adjustment inverter 2.
The energy adjustment system of the inverter provided by the embodiment of the present invention, the information about power of the inflow electrical network before the grid-connected input of the electrical network of detection is transferred to inverter by electric quantity detection apparatus, inverter receives this information about power, the peak power output limit value of described inverter is adjusted according to described information about power, to make the electricity flowing into electrical network for zero, achieve electric energy that inverter sends all or the overwhelming majority fallen by load consumption, achieve effective utilization of energy.
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 by limit value in these embodiments shown in this article, but can not will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (11)
1. an energy adjusting method for inverter, is characterized in that, be applied to inverter, and described method comprises:
The information about power of the inflow electrical network detected by described electric quantity detection apparatus is received from the electric quantity detection apparatus be connected with described inverter, before described electric quantity detection apparatus is arranged at the grid-connected input of electrical network, described grid-connected input refers to that inverter inputs port corresponding to energy to electrical network;
The information about power of the inflow electrical network detected by described electric quantity detection apparatus, judge to flow into the electricity of electrical network be on the occasion of or negative value;
If flow into the electricity of electrical network be on the occasion of, then reduce the peak power output limit value of described inverter, the electricity making inflow electrical network is zero;
The step of the peak power output limit value of the described inverter of described reduction specifically comprises:
Judge whether the electricity flowing into electrical network is greater than first threshold;
If the electricity flowing into electrical network is greater than described first threshold, then the peak power output limit value of described inverter is reduced the first preset value;
If the electricity flowing into electrical network is not more than described first threshold, or after described first preset value of peak power output limit value reduction of described inverter, then judge whether the electricity of current inflow electrical network is greater than Second Threshold;
If the electricity of current inflow electrical network is greater than described Second Threshold, then the current peak power output limit value of described inverter is reduced the second preset value.
2. the energy adjusting method of inverter according to claim 1, is characterized in that, describedly judges the electricity of current inflow electrical network also comprises after whether being greater than the step of Second Threshold:
If the electricity of current inflow electrical network is not more than described Second Threshold, or after the current peak power output of described inverter reduces the second preset value, then judge whether the current peak power output limit value of described inverter is less than default power output minimum value;
If the current peak power output limit value of described inverter is less than default power output minimum value, then adjusting described inverter current peak power output limit value is described default power output minimum value;
If the current peak power output limit value of described inverter is not less than default power output minimum value, then the current peak power output limit value maintaining described inverter is constant.
3. the energy adjusting method of inverter according to claim 1, is characterized in that, described judge to flow into the electricity of electrical network be on the occasion of or the step of negative value after also comprise:
If the electricity flowing into electrical network is negative value, then increase the peak power output limit value of described inverter.
4. the energy adjusting method of inverter according to claim 3, is characterized in that, the step of the peak power output limit value of the described inverter of described increase specifically comprises:
Judge whether the electricity flowing into electrical network is less than the 3rd threshold value;
If the electricity flowing into electrical network is less than described 3rd threshold value, then the current peak power output limit value of described inverter is increased the 3rd preset value;
If the electricity flowing into electrical network is not less than described 3rd threshold value, or after described 3rd preset value of peak power output limit value increase of described inverter, then judge whether the electricity of current inflow electrical network is less than the 4th threshold value;
If the electricity of current inflow electrical network is less than described 4th threshold value, then the current peak power output limit value of described inverter is increased the 4th preset value.
5. the energy adjusting method of inverter according to claim 4, is characterized in that, describedly judges the electricity of current inflow electrical network also comprises after whether being less than the step of the 4th threshold value:
If the electricity of current inflow electrical network is not less than described 4th threshold value, or after described 4th preset value of current peak power output limit value increase of described inverter, then judge whether the current peak power output limit value of described inverter is greater than default rated output power;
If the current peak power output limit value of described inverter is greater than default rated output power, then adjusting described inverter current peak power output limit value is described default rated output power;
If the current peak power output limit value of described inverter is not more than default rated output power, then the current peak power output limit value maintaining described inverter is constant.
6. an inverter, is characterized in that, described inverter comprises:
Information about power receiver module, for receiving the information about power of the inflow electrical network detected by described electric quantity detection apparatus from the electric quantity detection apparatus be connected with described inverter, before described electric quantity detection apparatus is arranged at the grid-connected input of electrical network, described grid-connected input refers to that inverter inputs port corresponding to energy to electrical network;
Power output limit value adjusting module, for adjusting the peak power output limit value of described inverter according to described information about power;
Described power output limit value adjusting module comprises:
Positive and negative values judging unit, for judge to flow into according to described information about power the electricity of electrical network be on the occasion of or negative value;
First power limit adjustment unit, for judge at described positive and negative values judging unit flow into electrical network electricity on the occasion of time, reduce the peak power output limit value of described inverter, make inflow electrical network electricity be zero;
Described first power limit adjustment unit comprises:
First judgment sub-unit, for judging whether the electricity flowing into electrical network is greater than first threshold;
First power limit reduces subelement, for when the judged result of described first judgment sub-unit is for being, the peak power output limit value of described inverter is reduced the first preset value;
Second judgment sub-unit, for when the judged result of described first judgment sub-unit is no, or described first power limit reduces subelement by after described first preset value of the peak power output limit value of described inverter reduction, judges whether the electricity of current inflow electrical network is greater than Second Threshold;
Second power limit reduces subelement, for when the judged result of described second judgment sub-unit is for being, the current peak power output limit value of described inverter is reduced the second preset value.
7. inverter according to claim 6, is characterized in that, described first power limit adjustment unit also comprises:
3rd judgment sub-unit, for when the judged result of described second judgment sub-unit is no, or described second power limit reduces subelement by after described second preset value of current peak power output limit value reduction of described inverter, judges whether the current peak power output limit value of described inverter is less than default power output minimum value;
First adjustment subelement, for when the judged result of described 3rd judgment sub-unit is for being, adjusting described inverter current peak power output limit value is described default power output minimum value;
First maintains subelement, and for when the judged result of described 3rd judgment sub-unit is no, the current peak power output limit value maintaining described inverter is constant.
8. inverter according to claim 6, is characterized in that, described power output limit value adjusting module also comprises:
Second power limit adjustment unit, when being negative value for judging to flow into the electricity of electrical network at described positive and negative values judging unit, increases the peak power output of described inverter.
9. inverter according to claim 8, is characterized in that, described second power limit adjustment unit comprises:
4th judgment sub-unit, for when the electricity of inflow electrical network is negative value, judges whether the electricity flowing into electrical network is less than the 3rd threshold value;
First power limit increases subelement, for when the judged result of described 4th judgment sub-unit is for being, the current peak power output limit value of described inverter is increased the 3rd preset value;
5th judgment sub-unit, for when the judged result of described 4th judgment sub-unit is no, or described first power limit increases subelement by after described 3rd preset value of current peak power output limit value increase of described inverter, judges whether the electricity of current inflow electrical network is less than the 4th threshold value;
Second power limit increases subelement, for when the judged result of described 5th judgment sub-unit is for being, the current peak power output limit value of described inverter is increased the 4th preset value.
10. inverter according to claim 9, is characterized in that, described second power limit adjustment unit also comprises:
6th judgment sub-unit, for when the judged result of described 5th judgment sub-unit is no, or described second power limit increases subelement by after described 4th preset value of current peak power output limit value increase of described inverter, judges whether the current peak power output limit value of described inverter is greater than default rated output power;
Second adjustment subelement, for when the judged result of described 6th judgment sub-unit is for being, adjusting described inverter current peak power output limit value is described default rated output power;
Second maintains subelement, and for when the judged result of described 6th judgment sub-unit is no, the current peak power output limit value maintaining described inverter is constant.
The energy adjustment system of 11. 1 kinds of inverters, is characterized in that, comprising: solar array device, the inverter as described in any one of claim 6-10, and electric quantity detection apparatus;
Wherein, before described electric quantity detection apparatus is arranged at the grid-connected input of electrical network, for detecting the information about power of inflow electrical network and sending described information about power to described inverter, described inverter adjusts the peak power output limit value of described inverter according to described information about power.
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| WO2023024028A1 (en) * | 2021-08-26 | 2023-03-02 | 华为数字能源技术有限公司 | Power system and control method for power system |
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| CN202353229U (en) * | 2011-09-30 | 2012-07-25 | 天津永明新能源科技有限公司 | Grid-connected photovoltaic power supply reverse-power prevention device |
| CN202455093U (en) * | 2012-02-10 | 2012-09-26 | 苏州欧姆尼克新能源科技有限公司 | Reverse power protection system of photovoltaic grid-connected inverter |
| CN102868175A (en) * | 2012-09-12 | 2013-01-09 | 南车株洲电力机车研究所有限公司 | Reverse power protection method and distributed power generation system |
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| JP2009148014A (en) * | 2007-12-12 | 2009-07-02 | Meidensha Corp | Method for interconnection photovoltaic power generation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202353229U (en) * | 2011-09-30 | 2012-07-25 | 天津永明新能源科技有限公司 | Grid-connected photovoltaic power supply reverse-power prevention device |
| CN202455093U (en) * | 2012-02-10 | 2012-09-26 | 苏州欧姆尼克新能源科技有限公司 | Reverse power protection system of photovoltaic grid-connected inverter |
| CN102868175A (en) * | 2012-09-12 | 2013-01-09 | 南车株洲电力机车研究所有限公司 | Reverse power protection method and distributed power generation system |
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