CN104184351A - Inverter control method and system - Google Patents

Inverter control method and system Download PDF

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CN104184351A
CN104184351A CN201410471328.1A CN201410471328A CN104184351A CN 104184351 A CN104184351 A CN 104184351A CN 201410471328 A CN201410471328 A CN 201410471328A CN 104184351 A CN104184351 A CN 104184351A
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current
load
inverter
parameter
controlled
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CN104184351B (en
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刘宝其
张彦虎
柳萌
薛丽英
胡兵
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Sungrow Power Supply Co Ltd
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Abstract

The invention discloses an inverter control method and system. The method comprises the steps that due to the facts that a relational expression between an output voltage and a load current is determined and a load current feedforward coefficient is introduced, the output voltage obtained after the load current feedforward coefficient is introduced is not affected by the load current, and then an inverter is controlled. Due to the fact that the inverter is controlled by adopting an output value obtained after the load current feedforward coefficient is introduced, the inverter has the capacity of carrying unbalance loads; due to the fact that only one load current feedforward coefficient needs to be introduced according to the scheme, the control mode is simple, no complex processes are needed, and the inverter can have the accurate voltage output under the situation that the inverter carries any unbalance load.

Description

A kind of inverter control method and system
Technical field
The present invention relates to field of power electronics, relate in particular to a kind of inverter control method and system.
Background technology
At present, in order to make three-phase four-wire system inverter there is the ability with unbalanced load, conventionally adopt in two ways: a kind of is a minute phase control, by introducing the required effective value of single-phase control, control, repeat to control or other control strategy based on internal model principle, guarantee the precision of output voltage, but it need to introduce more parameter, control comparatively complicated;
Another kind is that positive-negative sequence twin shaft is controlled, it need to carry out comparatively complicated parameter change and computing, when the negative sequence component of load balance output voltage hour, likely via negative phase-sequence controller, introduce unnecessary negative sequence component and affect output voltage, realize the rectification of output voltage is also needed to more complicated control.
Therefore, no matter adopt minute phase control or positive-negative sequence twin shaft to control, all need comparatively complex calculations, the precision of guarantee output voltage.
Summary of the invention
In view of this, the invention provides a kind of inverter control method and system, to solve, will realize three-phase four-wire system inverter have the problem that needs complicated control with the ability of unbalanced load in prior art, its concrete scheme is as follows:
An inverter control method, comprising:
Determine the output voltage of inverter and the closed loop transitive relation formula between given voltage and load current;
Analyze described closed loop transitive relation formula, introduce load-current feedforward coefficient, the coefficient that makes load current in described closed loop transitive relation formula is zero;
Load-current feedforward coefficient, outer voltage are controlled to ring control parameter in parameter and inductive current and carry out plus and minus calculation, obtain output valve, by described output valve, inverter is controlled.
Further, determine the closed loop transitive relation formula between output voltage and given voltage and load current, be specially:
Described outer voltage is controlled to ring control parameter in parameter and inductive current and carry out decoupling zero control, determine the closed loop transitive relation formula between output voltage and given voltage and load current.
Further, comprising: in described closed loop transitive relation formula, the coefficient of load current and outer voltage are controlled ring in parameter and inductive current and controlled the first default corresponding relation of parameter existence.
Further, described load-current feedforward coefficient is specially: control parameter with ring in inductive current and have the second default corresponding relation.
Further, described load-current feedforward coefficient also comprises: have the 3rd default corresponding relation with the induction reactance of described inverter.
An inverter control system, comprising: determining unit, and the introducing unit being connected with described determining unit, the control unit being connected with described introducing unit, wherein:
Described determining unit is for determining the output voltage of inverter and the closed loop transitive relation formula between given voltage and load current;
Described introducing unit is used for analyzing described closed loop transitive relation formula, introduces load-current feedforward coefficient, and the coefficient that makes load current in described closed loop transitive relation formula is zero;
Described control unit carries out plus and minus calculation for load-current feedforward coefficient, outer voltage being controlled to ring control parameter in parameter and inductive current, obtains output valve, by described output valve, inverter is controlled.
Further, described determining unit specifically comprises: decoupling zero unit, and the stator unit really that is connected with described decoupling zero unit, wherein:
Described decoupling zero unit carries out decoupling zero control for outer voltage being controlled to ring control parameter in parameter and inductive current;
Described definite subelement is controlled ring control parameter in parameter and inductive current for the outer voltage by after decoupling zero and is determined the closed loop transitive relation formula between output voltage and given voltage and load current.
Further, described closed loop transitive relation formula is specially: the coefficient of described load current and outer voltage are controlled ring in parameter and inductive current and controlled the first default corresponding relation of parameter existence.
Further, the load-current feedforward coefficient that described introducing unit is introduced is specially: control parameter with ring in inductive current and have the second default corresponding relation.
Further, the load-current feedforward coefficient that described introducing unit is introduced also comprises: have the 3rd default corresponding relation with the induction reactance of described inverter.
From technique scheme, can find out, the disclosed inverter control method of the application and system, by determining the relational expression between output voltage and load current, and introduce load-current feedforward coefficient, the output voltage that makes to introduce after load-current feedforward coefficient is not subject to the impact of load current, and then realizes the control to inverter.Adopt the output valve of introducing after load-current feedforward coefficient to control inverter, realize inverter and there is the ability with unbalanced load, and this programme only need to be introduced a load-current feedforward coefficient, control mode is simple, without comparatively complicated process, and can make, in the situation of any unbalanced load of inverter band, all to there is accurate Voltage-output.
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 the flow chart of the disclosed a kind of inverter control method of the embodiment of the present invention;
After Fig. 2 is the disclosed introducing load-current feedforward of embodiment of the present invention coefficient, the block diagram of controller and inverter;
Fig. 3 is the structural representation of the disclosed a kind of inverter control system of the embodiment of the present invention.
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.
The invention discloses a kind of inverter control method, its flow chart as shown in Figure 1, comprising:
Step S11, determine the output voltage of inverter and the closed loop transitive relation formula between given voltage and load current;
Inverter is controlled by the given voltage of input control device, given voltage is converted to the output valve of controller through controller, the output valve of controller is controlled inverter, wherein, the unbalanced load of inverter band, unbalanced load needs inverter that unbalanced load electric current is provided, and the final output voltage of inverter is impacted, and makes the output voltage of inverter and the given voltage that inputs to controller can not be corresponding.
Because the parameter of expression inverter is fixed, represent that the parameter of controller is fixed, therefore, can first determine the output voltage of inverter and input to the given voltage of controller and the relation of load current.
Wherein, closed loop transitive relation formula is formulated as:
V ci ( s ) = A 3 s 3 + A 2 s 2 + A 1 s + A 0 B 4 s 4 + B 3 s 3 + B 2 s 2 + B 1 s + B 0 V ciref ( s ) - C 4 s 4 + C 3 s 3 + C 2 s 2 + C 1 s B 4 s 4 + B 3 s 3 + B 2 s 2 + B 1 s + B 0 i oi ( s ) ;
Wherein, A i, B iand C iin, i=1,2,3,4, and A i, B iand C ito control the parameter of ring control parameter correlation in parameter, inductive current with filtering parameter and outer voltage; V ci(s) represent output voltage, V ciref(s) represent given voltage, i oi(s) represent load current.
Wherein: i oi(s) coefficient and B iand C irelevant, control ring in parameter and inductive current with outer voltage and control relating to parameters, there is the first default corresponding relation.
In addition, the expression formula of outer voltage control parameter is:
G v ( s ) = K pv s + K iv s ,
Wherein, G v(s) represent outer voltage control parameter, K pvrepresent outer voltage proportionality coefficient, K ivrepresent outer voltage integral coefficient, s represents the granny rag Lars factor.
G i ( s ) = K pi s + K ii s ,
Wherein, G i(s) represent that in inductive current, ring is controlled parameter, K pirepresent ring proportionality coefficient in inductive current, K iirepresent ring integral coefficient in inductive current.
Outer voltage is controlled to parameter G v(s) with in inductive current encircle control parameter G i(s) carry out decoupling zero control, and then determine closed loop transitive relation formula.
Step S12, analysis closed loop transitive relation formula, introduce load-current feedforward coefficient, and the coefficient that makes load current in closed loop transitive relation formula is zero;
Due to the output voltage of inverter be subject to load current impact and can not be corresponding with given voltage, therefore, need to eliminate the impact of load current.
According to above-mentioned formula, can clearly find out, work as i oi(s) when coefficient is zero, output voltage V ci(s) with given voltage V ciref(s) corresponding, output voltage is not subject to the impact of load current.
Therefore, introduce load-current feedforward COEFFICIENT K (s), making to introduce load-current feedforward COEFFICIENT K (s) coefficient rear and load current is zero, and its block diagram as shown in Figure 2.
According to above-mentioned block diagram, can obtain the expression of K (s):
K ( s ) = 1 + G i ( s ) Y L ( s ) G i ( s ) Y L ( s ) ,
Wherein, G i(s) represent that in inductive current, ring is controlled parameter, G v(s) represent outer voltage control parameter, Y l(s) represent induction reactance, inductive current feed-forward coefficients K (s) controls parameter G with the interior ring of inductive current iand the induction reactance Y of inverter (s) l(s) there is default corresponding relation.
Y L = 1 Ls + r L ,
L represents the inductance in inverter, r lthe dead resistance that represents inverter inductor.
Hence one can see that, and the feed-forward coefficients K of load current (s) controls parameter G with the interior ring of inductive current i(s) there is a kind of default corresponding relation, meanwhile, control parameter G with outer voltage v(s) also there is a kind of default corresponding relation.
Owing to introducing after K (s) coefficient, the coefficient of load current is zero, and so, the coefficient of load current and outer voltage are controlled parameter G v(s) ring is controlled parameter G and in inductive current i(s) there is a kind of default corresponding relation.
So, the in the situation that in outer voltage and inductive current, ring control parameter being controlled inverter, load-current feedforward coefficient is specially:
K ( s ) = Ls 2 + ( r L + K pi ) s + K ii K pi s + K ii .
Step S13, load-current feedforward coefficient, outer voltage are controlled in parameter and inductive current to ring control parameter and carry out plus and minus calculation, obtain output valve, by output valve, inverter is controlled.
Now, load-current feedforward COEFFICIENT K (s), outer voltage are controlled to ring in parameter and inductive current and control parameter G i(s) carry out plus and minus calculation, obtain introducing the output valve of the controller after load-current feedforward coefficient, by this output valve, inverter is controlled, now, the output voltage of inverter is only corresponding with given voltage, and can be not relevant with load current.
The disclosed inverter control method of the present embodiment, by determining the relational expression between output voltage and load current, and introduce load-current feedforward coefficient, the output voltage that makes to introduce after load-current feedforward coefficient is not subject to the impact of load current, and then realizes the control to inverter.Adopt the output valve of introducing after load-current feedforward coefficient to control inverter, realize inverter and there is the ability with unbalanced load, and only need to introduce a load-current feedforward coefficient, control mode is simple, without comparatively complicated process, and can make, in the situation of any unbalanced load of inverter band, all to there is accurate Voltage-output.
The present embodiment discloses a kind of inverter control system, and its structural representation as shown in Figure 3, comprising:
Determining unit 31, the introducing unit 32 being connected with determining unit 31, the control unit 33 being connected with introducing unit 32.
Determining unit 31 is for determining the output voltage of inverter and the closed loop transitive relation formula between given voltage and load current.
Inverter is controlled by the given voltage of input control device, given voltage is converted to the output valve of controller through controller, the output valve of controller is controlled inverter, wherein, the unbalanced load of inverter band, unbalanced load needs inverter that unbalanced load electric current is provided, and the final output voltage of inverter is impacted, and makes the output voltage of inverter and the given voltage that inputs to controller can not be corresponding.
Because the parameter of expression inverter is fixed, represent that the parameter of controller is fixed, therefore, can first determine the output voltage of inverter and input to the given voltage of controller and the relation of load current.
Wherein, closed loop transitive relation formula is formulated as:
V ci ( s ) = A 3 s 3 + A 2 s 2 + A 1 s + A 0 B 4 s 4 + B 3 s 3 + B 2 s 2 + B 1 s + B 0 V ciref ( s ) - C 4 s 4 + C 3 s 3 + C 2 s 2 + C 1 s B 4 s 4 + B 3 s 3 + B 2 s 2 + B 1 s + B 0 i oi ( s ) ;
Wherein, A i, B iand C iin, i=1,2,3,4, and A i, B iand C ito control the parameter of ring control parameter correlation in parameter, inductive current with filtering parameter and outer voltage; V ci(s) represent output voltage, V ciref(s) represent given voltage, i oi(s) represent load current.
In addition, the expression formula of outer voltage control parameter is:
G v ( s ) = K pv s + K iv s ,
Wherein, G v(s) represent outer voltage control parameter, K pvrepresent outer voltage proportionality coefficient, K ivrepresent outer voltage integral coefficient, s represents the granny rag Lars factor.
G i ( s ) = K pi s + K ii s ,
Wherein, G i(s) represent that in inductive current, ring is controlled parameter, K pirepresent ring proportionality coefficient in inductive current, K iirepresent ring integral coefficient in inductive current.
In addition, determining unit 31 specifically comprises: decoupling zero unit and the stator unit really that is connected with decoupling zero unit.
Decoupling zero unit is for controlling parameter G by outer voltage v(s) with in inductive current encircle control parameter G i(s) carry out decoupling zero control;
Determine that subelement controls in parameter and inductive current ring for outer voltage by after decoupling zero and control parameter and determine the closed loop transitive relation formula between output voltage and given voltage and load current.
Introduce unit 32 for analyzing closed loop transitive relation formula, introduce load-current feedforward coefficient, the coefficient that makes load current in closed loop transitive relation formula is zero.
Due to the output voltage of inverter be subject to load current impact and can not be corresponding with given voltage, therefore, in order to eliminate the impact of load current
According to above-mentioned formula, can clearly find out, work as i oi(s) when coefficient is zero, output voltage V ci(s) with given voltage V ciref(s) corresponding, output voltage is not subject to the impact of load current.
Therefore, introduce load-current feedforward COEFFICIENT K (s), the coefficient that makes load current is zero, and its block diagram as shown in Figure 2.
According to above-mentioned block diagram and load-current feedforward COEFFICIENT K (s), equate with the coefficient of load current, can obtain the expression of K (s):
K ( s ) = 1 + G i ( s ) Y L ( s ) G i ( s ) Y L ( s ) ,
Wherein, G i(s) represent that in inductive current, ring is controlled parameter, G v(s) represent outer voltage control parameter, Y l(s) represent induction reactance.
Y L = 1 Ls + r L ,
L represents the inductance in inverter, r lthe dead resistance that represents inverter inductor.
Hence one can see that, and the feed-forward coefficients K of load current (s) controls parameter G with the interior ring of inductive current i(s) there is a kind of default corresponding relation, meanwhile, control parameter G with outer voltage v(s) also there is a kind of default corresponding relation.
Because K (s) equates with the coefficient of load current, so, the coefficient of load current and outer voltage are controlled parameter G v(s) ring is controlled parameter G and in inductive current i(s) there is a kind of default corresponding relation.
So, the in the situation that in outer voltage and inductive current, ring control parameter being controlled inverter, load-current feedforward coefficient is specially:
K ( s ) = Ls 2 + ( r L + K pi ) s + K ii K pi s + K ii .
Control unit 33 carries out plus and minus calculation for load-current feedforward coefficient, outer voltage being controlled to ring control parameter in parameter and inductive current, obtains output valve, by output valve, inverter is controlled.
Now, load-current feedforward COEFFICIENT K (s), outer voltage are controlled to ring in parameter and inductive current and control parameter G i(s) carry out plus and minus calculation, obtain introducing the output valve of the controller after load-current feedforward coefficient, by this output valve, inverter is controlled, now, the output voltage of inverter is only corresponding with given voltage, and irrelevant with load current.
The disclosed inverter control system of the present embodiment, by determining the relational expression between output voltage and load current, and introduce load-current feedforward coefficient, the output voltage that makes to introduce after load-current feedforward coefficient is not subject to the impact of load current, and then realizes the control to inverter.Adopt the output valve of introducing after load-current feedforward coefficient to control inverter, realize inverter and there is the ability with unbalanced load, and only need to introduce a load-current feedforward coefficient, control mode is simple, without comparatively complicated process, and can make, in the situation of any unbalanced load of inverter band, all to there is accurate Voltage-output.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.For the disclosed device of embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part partly illustrates referring to method.
Professional can also further recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software is clearly described, composition and the step of each example described according to function in the above description in general manner.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought and exceeds scope of the present invention.
The software module that the method for describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use hardware, processor to carry out, or the combination of the two is implemented.Software module can be placed in the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
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 (10)

1. an inverter control method, is characterized in that, comprising:
Determine the output voltage of inverter and the closed loop transitive relation formula between given voltage and load current;
Analyze described closed loop transitive relation formula, introduce load-current feedforward coefficient, the coefficient that makes load current in described closed loop transitive relation formula is zero;
Load-current feedforward coefficient, outer voltage are controlled to ring control parameter in parameter and inductive current and carry out plus and minus calculation, obtain output valve, by described output valve, inverter is controlled.
2. method according to claim 1, is characterized in that, determines the closed loop transitive relation formula between output voltage and given voltage and load current, is specially:
Described outer voltage is controlled to ring control parameter in parameter and inductive current and carry out decoupling zero control, determine the closed loop transitive relation formula between output voltage and given voltage and load current.
3. method according to claim 1, is characterized in that, comprising: in described closed loop transitive relation formula, the coefficient of load current and outer voltage are controlled ring in parameter and inductive current and controlled the first default corresponding relation of parameter existence.
4. method according to claim 1, is characterized in that, described load-current feedforward coefficient is specially: control parameter with ring in inductive current and have the second default corresponding relation.
5. method according to claim 4, is characterized in that, described load-current feedforward coefficient also comprises: have the 3rd default corresponding relation with the induction reactance of described inverter.
6. an inverter control system, is characterized in that, comprising: determining unit, and the introducing unit being connected with described determining unit, the control unit being connected with described introducing unit, wherein:
Described determining unit is for determining the output voltage of inverter and the closed loop transitive relation formula between given voltage and load current;
Described introducing unit is used for analyzing described closed loop transitive relation formula, introduces load-current feedforward coefficient, and the coefficient that makes load current in described closed loop transitive relation formula is zero;
Described control unit carries out plus and minus calculation for load-current feedforward coefficient, outer voltage being controlled to ring control parameter in parameter and inductive current, obtains output valve, by described output valve, inverter is controlled.
7. system according to claim 6, is characterized in that, described determining unit specifically comprises: decoupling zero unit, and the stator unit really that is connected with described decoupling zero unit, wherein:
Described decoupling zero unit carries out decoupling zero control for outer voltage being controlled to ring control parameter in parameter and inductive current;
Described definite subelement is controlled ring control parameter in parameter and inductive current for the outer voltage by after decoupling zero and is determined the closed loop transitive relation formula between output voltage and given voltage and load current.
8. system according to claim 6, is characterized in that, described closed loop transitive relation formula is specially: the coefficient of described load current and outer voltage are controlled ring in parameter and inductive current and controlled the first default corresponding relation of parameter existence.
9. system according to claim 6, is characterized in that, the load-current feedforward coefficient that described introducing unit is introduced is specially: control parameter with ring in inductive current and have the second default corresponding relation.
10. system according to claim 9, is characterized in that, the load-current feedforward coefficient that described introducing unit is introduced also comprises: have the 3rd default corresponding relation with the induction reactance of described inverter.
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CN108880304A (en) * 2018-06-21 2018-11-23 西安理工大学 A kind of inverter quality of voltage control method based on output current feed-forward
CN117040299A (en) * 2023-08-14 2023-11-10 燕山大学 Hybrid control method for converter

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