CN104104253A - Inverter power control method and device - Google Patents
Inverter power control method and device Download PDFInfo
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- CN104104253A CN104104253A CN201410374422.5A CN201410374422A CN104104253A CN 104104253 A CN104104253 A CN 104104253A CN 201410374422 A CN201410374422 A CN 201410374422A CN 104104253 A CN104104253 A CN 104104253A
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- current
- inverter
- error
- direct current
- increment
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Abstract
The invention discloses an inverter power control method and device. The inverter power control method includes acquiring direct-current output voltage of an inverter at set time intervals; calculating current direct-current voltage error according to a reference voltage of a direct-current ring of the inverter and the direct-current output voltage; controlling current reference current change rate of a current ring of the inverter according to the current direct-current voltage errors and the last direct-current voltage error. By the photovoltaic inverter power control method, the current reference current change rate of the current ring of the inverter can be controlled, so that alternating-current output current of the inverter gradually increases, power of the inverter can be controlled to gradually increase, and the problem of sudden increase of the power of the inverter due to changes of the external environment can be prevented.
Description
Technical field
The present invention relates to generation of electricity by new energy technical field, more particularly, relate to a kind of inverter power control method and control device.
Background technology
In energy crisis day by day serious today, renewable generation of electricity by new energy becomes a current major subjects for electrical domain development.New energy, as wind power generation and solar power generation etc., need to adopt inverter that direct current is converted to and the alternating current of power supply grid voltage with frequency, homophase, thereby realize, can power to the load, again can be to the system of power supply grid transmission of electric energy.
Along with the development of generation of electricity by new energy technology, generation of electricity by new energy proportion is increasing in electric power system, so environmental condition changes the problem cause its inverter power output to be uprushed, and the impact that electric power system is caused is also increasing.If do not controlled, the inverter power output of new energy system is uprushed and can be produced larger impact to whole electric power system.If photovoltaic DC-to-AC converter is when illumination strengthens, uprushing of power output can cause electrical network to produce fluctuation.
Known by foregoing description, how suppressing that described inverter power uprushes is the problem that the current urgent need in generation of electricity by new energy field solves.
Summary of the invention
For addressing the above problem, the invention provides a kind of inverter power control method and control device, solved the problem that inverter power is uprushed.
An inverter power control method, this control method comprises:
With the time interval of setting, gather the VD of described inverter;
According to the reference voltage of the direct current pressure ring of described inverter and described VD, calculate current direct current voltage error;
The current reference current rate of change of controlling the electric current loop of described inverter according to current direct current voltage error and a front direct current voltage error, progressively increases the ac output current of described inverter.
Preferably, in above-mentioned inverter power control method, the described current reference current rate of change of controlling the electric current loop of described inverter according to current direct current voltage error and a front direct current voltage error, is progressively increased to the ac output current of described inverter:
According to current direct current voltage error and a front direct current voltage error, adopt increment type PI control algolithm, calculate the error current increment of described direct current pressure ring;
According to described error current increment, adopt nonlinear control method, control the current reference current rate of change of the direct current pressure ring of described inverter, the ac output current of described inverter is progressively increased.
Preferably, in above-mentioned inverter power control method, described according to described error current increment, adopt nonlinear control method, the current reference current rate of change of controlling the direct current pressure ring of described inverter, makes the ac output current of described inverter progressively increase and comprise:
When described error current increment is less than or equal to first threshold, make the current reference current rate of change of the electric current loop of described inverter equal described error current increment, when described error current increment is greater than described first threshold, make described current reference current rate of change equal described first threshold.
Preferably, in above-mentioned inverter power control method, when described current direct current voltage error is greater than Second Threshold, also comprise:
Make current direct current voltage error equal described first threshold.
The present invention also provides a kind of inverter power control device, and this inverter power control device comprises:
Data acquisition unit, described data acquisition unit gathers the VD of described inverter for the time interval to set;
Computing unit, described computing unit, for according to the reference voltage of the direct current pressure ring of described inverter and described VD, calculates current direct current voltage error;
Control unit, described control unit is for controlling the current reference current rate of change of the electric current loop of described inverter according to current direct current voltage error and a front direct current voltage error.
Preferably, in above-mentioned inverter power control device, described control unit is increment type PI controller;
Described increment type PI controller adopts increment type PI control algolithm, calculates the error current increment of described direct current pressure ring; When described error current increment is less than or equal to first threshold, make the current reference current rate of change of the electric current loop of described inverter equal described error current increment, when described error current increment is greater than described first threshold, make described current reference current rate of change equal described first threshold.
Preferably, in above-mentioned inverter power control device, also comprise:
Amplitude limit unit, when described current direct current voltage error is greater than Second Threshold, described amplitude limit unit is used for making current direct current voltage error to equal described first threshold.
Preferably, in above-mentioned inverter power control device, described inverter is photovoltaic DC-to-AC converter, or wind energy inverter.
From foregoing description, the inverter power control method described in present techniques scheme comprises: the VD that gathers described inverter with the time interval of setting; According to the reference voltage of the direct current pressure ring of described inverter and described VD, calculate current direct current voltage error; According to current direct current voltage error and a front direct current voltage error, control the current reference current rate of change of the electric current loop of described inverter.Described photovoltaic DC-to-AC converter Poewr control method can be controlled the current reference current rate of change of described inverter current ring, the ac output current of described inverter is progressively increased, thereby can control described inverter power, progressively increase, can prevent the problem of uprushing due to the inverter power that external environment change causes.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is for applying for the schematic flow sheet of a kind of inverter power control method that embodiment provides;
Fig. 2 is current reference current rate of change and the function relation figure of current reference current rate of change when nonlinear control method;
The structural representation of a kind of inverter power control device that Fig. 3 provides for the embodiment of the present application;
The oscillogram of Fig. 4 power stage of photovoltaic DC-to-AC converter when adopting inverter power control device described in the embodiment of the present application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Existing generation of electricity by new energy, as wind power generation, sun generating etc., when wind-force increases suddenly or when illumination strengthens suddenly, all can cause the power output of inverter to be uprushed, causes the voltage fluctuation of network system.Therefore, the uprushing of inverter power output when how to be suppressed at external environment and to change, is the problem that the current urgent need in generation of electricity by new energy field solves.
For addressing the above problem, the embodiment of the present application provides a kind of inverter power control method, and with reference to figure 1, Fig. 1 is for applying for the schematic flow sheet of a kind of inverter power control method that embodiment provides, and this inverter power control method comprises:
Step S11: the VD u that gathers described inverter with the time interval of setting
dc.
Can coordinate voltage collecting device by clock count device, described inverter be carried out to voltage acquisition with the time interval of setting, obtain its VD u
dc.
Step S12: according to the reference voltage u of the direct current pressure ring of described inverter
dcrefand described VD u
dc, calculate current direct current voltage error U
err(k).
For the inverter of setting, the reference voltage u of its direct current pressure ring
dcreffor known constant, U
err=u
dcref-u
dc, as current, be counted as the k time, U
err(k)=u
dcref-u
dc(k), k is positive integer.
Step S13: according to current direct current voltage error U
errand a front direct current voltage error U (k)
err (k-1) control the current reference current rate of change Δ i of the electric current loop of described inverter
lref(k), make the ac output current i of described inverter
lrefprogressively increase.
Described step S13 comprises:
Step S131: according to current direct current voltage error U
errand a front direct current voltage error U (k)
err(k-1), adopt increment type PI control algolithm, calculate the error current increment Delta U of described direct current pressure ring
out(k).
According to increment type PI control algolithm, have:
ΔU
out(k)＝K
p(U
err(k)-U
err(k-1))+K
iU
err(k)
Wherein, K
pfor the proportionality constant in increment type PI control algolithm, K
ifor the integral constant in PI control algolithm.
Step S132: according to described error current increment Delta U
out(k), adopt nonlinear control method, control the current reference current rate of change Δ i of the direct current pressure ring of described inverter
lref(k), make the ac output current i of described inverter
lrefprogressively increase.
Described step S132 is specifically as follows: as described error current increment Delta U
out(k) be less than or equal to first threshold Δ i
stime, make the current reference current rate of change Δ i of the electric current loop of described inverter
lref(k) equal described error current increment Delta U
out(k), as described error current increment Delta U
out(k) be greater than described first threshold Δ i
stime, make described current reference current rate of change Δ i
lref(k) equal described first threshold Δ i
s, have:
Wherein, described first threshold Δ i
sfor Δ i in nonlinear control method
lref(k) maximum, for initialization system, described first threshold Δ i
sfor setting constant.
With reference to figure 2, Fig. 2 is current reference current rate of change and the function relation figure of current reference current rate of change when nonlinear control method.By nonlinear control method, can be so that current reference current rate of change Δ i
lref(k) according to trend shown in Fig. 2, progressively increase.
When the output of described inverter is uprushed, its ac output current benchmark i
lreffor
i
Lref(k)＝i
Lref(k-1)+Δi
Lref(k)
In said process, by controlling described error current increment Delta U
out(k), to current reference current rate of change Δ i
lref(k) control, make it along with error current increment Delta U
out(k) change progressively increases, and then can control AC-AC output current i
lrefrate of change, cause uprushing of described photovoltaic DC-to-AC converter power output when preventing that external environment from changing.Described in the present embodiment, environmental change refers to cause power output to become large variation, during as photovoltaic generation, and the increase of light intensity, the increase of wind-force during wind power generation.The present embodiment does not change the size of the final power output of inverter, by described nonlinear Control, make inverter when the environmental change, its output progressively increases, with respect to prior art, reduce its increase of output power speed, can avoid network system to occur big ups and downs, guarantee the stability of electric power system.The present embodiment adopts nonlinear control method, realizes simple and reliablely, is applicable to engineering application, and cost is lower.
Can adopt increment type PI controller to realize described step S131.In order to prevent increment type PI controller saturation, when described current direct current voltage error is greater than Second Threshold, between described step S12 and step S131, also comprise step: make current direct current voltage error U
err(k) equal described first threshold U
max.
Known by foregoing description, described inverter power control method is by controlling the voltage of inverter direct-current voltage ring and then the current reference current rate of change Δ i of control inverter electric current loop
lref(k) progressively increase, thereby suppress ac output current i
lrefrate of change, avoid uprushing of inverter power.
Based on above-described embodiment, another embodiment of the application also provides a kind of inverter power control device, with reference to figure 3, the structural representation of a kind of inverter power control device that Fig. 3 provides for the embodiment of the present application, comprising: data acquisition unit 1, computing unit 2 and control unit 3.Described computing unit 2 connects respectively at described data acquisition unit 1 and described control unit 3.
Described data acquisition unit 1 gathers the VD of described inverter for the time interval to set.Can to the electric current of described inverter and voltage, gather by AD module built-in or that extend out.
Described computing unit 2, for according to the reference voltage of the direct current pressure ring of described inverter and described VD, calculates current direct current voltage error.
Described control unit 3 is for controlling the current reference current rate of change of the electric current loop of described inverter according to current direct current voltage error and a front direct current voltage error.Described control unit 3 can be increment type PI controller.Described increment type PI controller adopts increment type PI control algolithm, calculates the error current increment of described direct current pressure ring; When described error current increment is less than or equal to first threshold, make the current reference current rate of change of the electric current loop of described inverter equal described error current increment, when described error current increment is greater than described first threshold, make described current reference current rate of change equal described first threshold.
When described control unit 3 is increment type PI controller, in order to prevent increment type PI controller saturation, described inverter power control device also comprises: amplitude limit unit 4, when described current direct current voltage error is greater than Second Threshold, described amplitude limit unit 4 is for making current direct current voltage error equal described first threshold.Described amplitude limit unit 4 is arranged between described data acquisition unit 1 and described computing unit 2.
Inverter described in described inverter power control device can be the inverter of the new energy grid-connected power systems such as photovoltaic DC-to-AC converter or wind energy inverter.
Take photovoltaic DC-to-AC converter as example, with reference to figure 4, the oscillogram of Fig. 4 power stage of photovoltaic DC-to-AC converter when adopting inverter power control device described in the embodiment of the present application.
Intensity variation is as shown in (a) figure in Fig. 4, and (a) in figure, transverse axis is the time, the s of unit, and the longitudinal axis is light intensity, unit is KJ/m
2.The output of scheming corresponding photovoltaic DC-to-AC converter with (a) is as shown in (b) figure in Fig. 4, and (b) in figure, transverse axis is the time, the s of unit, and the longitudinal axis is power output, unit is 10
5w.
When illumination changes from weak to strong, from 400KJ/m
2become 800KJ/m
2, inverter real output rises according to the climbing of appointment, until maximum power.From effect, can find out that power variation rate is similar to linearity, thereby effectively suppress the illumination power output that the causes phenomenon of uprushing of uprushing.Wherein,
Described inverter power control device can be by controlling the voltage of inverter direct-current voltage ring and then the current reference current rate of change of control inverter electric current loop progressively increases, thereby suppress the rate of change of ac output current, avoid uprushing of inverter power.Its control principle can, referring to above-described embodiment, not repeat them here.It should be noted that, inverter power control device is based on inverter power control method described in above-described embodiment described in the present embodiment, and something in common can remark additionally mutually.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. an inverter power control method, is characterized in that, comprising:
With the time interval of setting, gather the VD of described inverter;
According to the reference voltage of the direct current pressure ring of described inverter and described VD, calculate current direct current voltage error;
The current reference current rate of change of controlling the electric current loop of described inverter according to current direct current voltage error and a front direct current voltage error, progressively increases the ac output current of described inverter.
2. inverter power control method according to claim 1, it is characterized in that, the described current reference current rate of change of controlling the electric current loop of described inverter according to current direct current voltage error and a front direct current voltage error, is progressively increased to the ac output current of described inverter:
According to current direct current voltage error and a front direct current voltage error, adopt increment type PI control algolithm, calculate the error current increment of described direct current pressure ring;
According to described error current increment, adopt nonlinear control method, control the current reference current rate of change of the direct current pressure ring of described inverter, the ac output current of described inverter is progressively increased.
3. inverter power control method according to claim 2, it is characterized in that, described according to described error current increment, adopt nonlinear control method, the current reference current rate of change of controlling the direct current pressure ring of described inverter, makes the ac output current of described inverter progressively increase and comprise:
When described error current increment is less than or equal to first threshold, make the current reference current rate of change of the electric current loop of described inverter equal described error current increment, when described error current increment is greater than described first threshold, make described current reference current rate of change equal described first threshold.
4. inverter power control method according to claim 3, is characterized in that, when described current direct current voltage error is greater than Second Threshold, also comprises:
Make current direct current voltage error equal described first threshold.
5. an inverter power control device, is characterized in that, comprising:
Data acquisition unit, described data acquisition unit gathers the VD of described inverter for the time interval to set;
Computing unit, described computing unit, for according to the reference voltage of the direct current pressure ring of described inverter and described VD, calculates current direct current voltage error;
Control unit, described control unit is for controlling the current reference current rate of change of the electric current loop of described inverter according to current direct current voltage error and a front direct current voltage error.
6. inverter power control device according to claim 5, is characterized in that, described control unit is increment type PI controller;
Described increment type PI controller adopts increment type PI control algolithm, calculates the error current increment of described direct current pressure ring; When described error current increment is less than or equal to first threshold, make the current reference current rate of change of the electric current loop of described inverter equal described error current increment, when described error current increment is greater than described first threshold, make described current reference current rate of change equal described first threshold.
7. inverter power control device according to claim 6, is characterized in that, also comprises:
Amplitude limit unit, when described current direct current voltage error is greater than Second Threshold, described amplitude limit unit is used for making current direct current voltage error to equal described first threshold.
8. inverter power control device according to claim 5, is characterized in that, described inverter is photovoltaic DC-to-AC converter, or wind energy inverter.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512428A (en) * | 2017-02-28 | 2018-09-07 | 英飞凌科技奥地利有限公司 | Isolated electric pressure converter and its control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101694943A (en) * | 2009-10-21 | 2010-04-14 | 广州市圣大电子有限公司 | PSIM software-based control method and simulation system for solar grid-connected inverter |
| CN102611138A (en) * | 2012-03-20 | 2012-07-25 | 湖南大学 | Delay-free single-phase photovoltaic synchronization power adjusting method |
| CN102780232A (en) * | 2012-07-24 | 2012-11-14 | 华南理工大学 | Three-ring control method and three-ring control device of single-stage type photovoltaic grid-connected inverter system |
| CN102843035A (en) * | 2012-09-19 | 2012-12-26 | 南京国臣信息自动化技术有限公司 | Transformer control method with precise voltage and current limitation and maximum power point tracking functions |
| CN103795083A (en) * | 2014-02-20 | 2014-05-14 | 新疆希望电子有限公司 | Grid connection current soft start and soft stop method and system for photovoltaic grid-connected inverter |
-
2014
- 2014-07-31 CN CN201410374422.5A patent/CN104104253B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101694943A (en) * | 2009-10-21 | 2010-04-14 | 广州市圣大电子有限公司 | PSIM software-based control method and simulation system for solar grid-connected inverter |
| CN102611138A (en) * | 2012-03-20 | 2012-07-25 | 湖南大学 | Delay-free single-phase photovoltaic synchronization power adjusting method |
| CN102780232A (en) * | 2012-07-24 | 2012-11-14 | 华南理工大学 | Three-ring control method and three-ring control device of single-stage type photovoltaic grid-connected inverter system |
| CN102843035A (en) * | 2012-09-19 | 2012-12-26 | 南京国臣信息自动化技术有限公司 | Transformer control method with precise voltage and current limitation and maximum power point tracking functions |
| CN103795083A (en) * | 2014-02-20 | 2014-05-14 | 新疆希望电子有限公司 | Grid connection current soft start and soft stop method and system for photovoltaic grid-connected inverter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512428A (en) * | 2017-02-28 | 2018-09-07 | 英飞凌科技奥地利有限公司 | Isolated electric pressure converter and its control method |
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