CN103762828A - Method and device for controlling multistage power electronic converter system - Google Patents
Method and device for controlling multistage power electronic converter system Download PDFInfo
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- CN103762828A CN103762828A CN201310750056.4A CN201310750056A CN103762828A CN 103762828 A CN103762828 A CN 103762828A CN 201310750056 A CN201310750056 A CN 201310750056A CN 103762828 A CN103762828 A CN 103762828A
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Abstract
The invention provides a method and device for controlling a multistage power electronic converter system. The method comprises the steps that a current input and output condition of the multistage power electronic converter system is determined; a busbar voltage optimal solution corresponding to the current input and output condition is obtained from a preset data file, wherein the busbar voltage optimal solution is a corresponding voltage value of a busbar between two converters with adjacent stages when an arithmetic product of the efficiency of the power electronic converters of multiple stages in the multistage power electronic converter system is the largest; according to the busbar voltage optimal solution, a corresponding voltage value is set for the relevant busbar. Due to the fact that the efficiency of the multistage power electronic converter system is made largest through optimization of a control method, the method for controlling the multistage power electronic converter system does not depend on reformation of any device, and the cost of the whole multistage power electronic converter system is reduced.
Description
Technical field
The application relates to converters field, particularly a kind of control method of multistage converters system and device.
Background technology
In converters, consider the optimization of reliability, input and output insulation and the design of circuit, often adopt multi-level pmultistage circuit structure.
Along with energy problem is increasingly serious, more and more higher to the requirement of the energy conversion efficiency of converters.For multistage converters system, the efficiency of whole system equals the efficiency product of converters at different levels.
Improve at present the efficiency of whole system, mostly depend on the innovation of device, such as adopting the device for power switching that switching loss is lower, On-resistance is lower, the magnetic device that core loss is lower, but by the innovation of device, improve the efficiency of whole system, can cause the cost of whole system to increase.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of control method and device of multistage converters system, and to reach the object that reduces system cost, technical scheme is as follows:
A control method for multistage converters system, comprising:
Determine the current input/output condition of described multistage converters system;
From preset data file, obtain the busbar voltage optimal solution that described current input/output condition is corresponding, described busbar voltage optimal solution is the product of the efficiency of converters at different levels in described multistage converters system when maximum, the magnitude of voltage of the bus between adjacent two converters of corresponding rank;
According to described busbar voltage optimal solution, for corresponding bus arranges corresponding magnitude of voltage.
Preferably, in the situation that described multistage converters system is two stage power electronic converter system, the generative process of described busbar voltage optimal solution, comprising:
At input/output condition, fixedly in the situation that, determine the adjusting range of two busbar voltages between converter;
Each self-corresponding efficiency while measuring respectively each magnitude of voltage in described busbar voltage is described adjusting range of two converters;
Calculate the product of the efficiency of two converters that in described adjusting range, each magnitude of voltage is corresponding;
According to the result of calculating, determine that the magnitude of voltage that max product is corresponding is busbar voltage optimal solution.
Preferably, in the situation that described multistage converters system is two stage power electronic converter system, the generative process of described busbar voltage optimal solution, comprising:
At input/output condition, fixedly in the situation that, determine the adjusting range of two busbar voltages between converter;
Each self-corresponding efficiency while measuring respectively each representative magnitude of voltage in described busbar voltage is described adjusting range of two converters;
Adopt fitting algorithm to obtain two converters corresponding efficiency during the magnitude of voltage except representative magnitude of voltage in described busbar voltage is described adjusting range;
Calculate the product of the efficiency of two converters that in described adjusting range, each magnitude of voltage is corresponding;
According to the result of calculating, determine that the magnitude of voltage that max product is corresponding is busbar voltage optimal solution.
Preferably, each self-corresponding efficiency during each magnitude of voltage in described busbar voltage is described adjusting range of two converters that measure, characterizes by efficiency change line.
Preferably, the deterministic process of described adjusting range, is specially:
Withstand voltage according to the physical circuit device that topological sum is used of the input and output voltage condition of two stage power electronic converter system and converters at different levels, determines the adjusting range of described busbar voltage.
A control device for multistage converters system, comprising:
The first determining unit, for determining the current input/output condition of described multistage converters system;
The first acquiring unit, for obtaining from preset data file the busbar voltage optimal solution that described current input/output condition is corresponding, described busbar voltage optimal solution is the product of the efficiency of converters at different levels in described multistage converters system when maximum, the magnitude of voltage of the bus between adjacent two converters of corresponding rank;
Setting unit, for according to described busbar voltage optimal solution, for corresponding bus arranges corresponding magnitude of voltage.
Preferably, comprising:
The second determining unit, for fixedly in the situation that, determining the adjusting range of two busbar voltages between converter at input/output condition;
The first measuring unit, each self-corresponding efficiency when measuring respectively each magnitude of voltage in described busbar voltage is described adjusting range of two converters;
The first computing unit, for calculating the product of the efficiency of two converters that in described adjusting range, each magnitude of voltage is corresponding;
The 3rd determining unit, for the result according to calculating, determines that the magnitude of voltage that max product is corresponding is busbar voltage optimal solution.
Preferably, comprising:
The 4th determining unit, for fixedly in the situation that, determining the adjusting range of two busbar voltages between converter at input/output condition;
The second measuring unit, each self-corresponding efficiency when measuring respectively each representative magnitude of voltage in described busbar voltage is described adjusting range of two converters;
Second acquisition unit, for adopting fitting algorithm to obtain two converters corresponding efficiency during the magnitude of voltage except representative magnitude of voltage in described busbar voltage is described adjusting range;
The second computing unit, for calculating the product of the efficiency of two converters that in described adjusting range, each magnitude of voltage is corresponding;
The 5th determining unit, for the result according to calculating, determines that the magnitude of voltage that max product is corresponding is busbar voltage optimal solution.
Preferably, comprising:
Characterization unit, for characterizing by efficiency change line, each self-corresponding efficiency during each magnitude of voltage in described busbar voltage is described adjusting range of two converters that measure.
Preferably, withstand voltage specifically for according to the physical circuit device that topological sum is used of the input and output voltage condition of two stage power electronic converter system and converters at different levels of described the second determining unit or the 4th determining unit, determines the adjusting range of described busbar voltage.
Compared with prior art, the application's beneficial effect is:
In this application, due to input voltage, these three variablees of output voltage and power output are restricted by extraneous factor, not that converter self can be free to arrange, only have the intermediate variable (being busbar voltage) of multilevel converter internal system to be free to arrange by converter self, so the control method that the application proposes make the efficiency of whole changer system reach optimum by adjusting intermediate variable (being busbar voltage).While being the product maximum of the efficiency of converters at different levels in described multistage converters system due to busbar voltage optimal solution, the magnitude of voltage of the bus between adjacent two converters of corresponding rank, therefore according to busbar voltage optimal solution, for corresponding bus arranges corresponding magnitude of voltage, corresponding bus sets after corresponding magnitude of voltage, the efficiency product of converters at different levels is maximum, thereby it is maximum that the efficiency that makes multistage converters system reaches, optimized the efficiency of multistage converters system.
Visible, the application is by making the efficiency of multistage converters system reach maximum to the optimization of control method, do not rely on the innovation of any device, having reduced the cost of whole multistage converters system.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present application, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiment of the application, 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 a kind of flow chart of the control method of the multistage converters system that provides of the application;
Fig. 2 is a kind of sub-process figure of the control method of the multistage converters system that provides of the application;
Fig. 3 is a kind of schematic diagram of the efficiency change line that provides of the application;
Fig. 4 is the another kind of schematic diagram of the efficiency change line that provides of the application;
Fig. 5 is the another kind of sub-process figure of the control method of the multistage converters system that provides of the application;
Fig. 6 is a kind of structural representation of the control device of the multistage converters system that provides of the application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Embodiment based in the application, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the application's protection.
An embodiment
Refer to Fig. 1, a kind of flow chart that it shows the control method of the multistage converters system that the application provides, can comprise the following steps:
Step S11: the current input/output condition of determining described multistage converters system.
Step S12: obtain the busbar voltage optimal solution that described current input/output condition is corresponding from preset data file, described busbar voltage optimal solution is the product of the efficiency of converters at different levels in described multistage converters system when maximum, the magnitude of voltage of the bus between adjacent two converters of corresponding rank.
In the present embodiment, in preset data file, store a plurality of busbar voltage optimal solutions, respectively corresponding different input/output conditions, i.e. a respectively corresponding busbar voltage optimal solution under different input/output conditions.
The number that the number of the magnitude of voltage in busbar voltage optimal solution equals the converter that multistage converters system comprises subtracts the numerical value after 1, because the number that the number of the bus in multistage converters system is converter subtracts 1, need to meet the corresponding magnitude of voltage of each bus.
While now for example busbar voltage optimal solution being the product maximum of the efficiency of converters at different levels in described multistage converters system, the magnitude of voltage of the bus between adjacent two converters of corresponding rank describes, if multistage converters system is 3 grades of converters systems, comprise 3 converters, be respectively front stage converter, intergrade converter and rear class converter, between front stage converter and intergrade converter, by bus 1, connect, between intergrade converter and rear class converter, by bus 2, connect, busbar voltage optimal solution is the efficiency of front stage converter in 3 grades of converters systems, when the product of the efficiency of the efficiency of intergrade converter and rear class converter is maximum, corresponding front stage converter and the magnitude of voltage of the bus 1 between intergrade converter, the magnitude of voltage of the bus 2 between intergrade converter and rear class converter.
Step S13: according to described busbar voltage optimal solution, for corresponding bus arranges corresponding magnitude of voltage.
Still with the example in step S12 to according to busbar voltage optimal solution, for arranging corresponding magnitude of voltage, corresponding bus describes, busbar voltage optimal solution comprises two magnitudes of voltage, be respectively the magnitude of voltage of bus 1 and the magnitude of voltage of bus 2, the magnitude of voltage of the bus 1 in busbar voltage optimal solution is set to the magnitude of voltage of bus 1, and the magnitude of voltage of the bus 2 in busbar voltage optimal solution is set to the magnitude of voltage of bus 2.
It should be noted that, when current input/output condition changes, the busbar voltage optimal solution of obtaining corresponding input/output condition from preset data file can realize the variation according to input/output condition, the real-time magnitude of voltage that respective bus bars is set, guarantees that multistage converters system can still can reach system effectiveness optimum with the variation of input/output condition.
In this application, due to input voltage, these three variablees of output voltage and power output are restricted by extraneous factor, not that converter self can be free to arrange, only have the intermediate variable (being busbar voltage) of multilevel converter internal system to be free to arrange by converter self, so the control method that the application proposes make the efficiency of whole changer system reach optimum by adjusting intermediate variable (being busbar voltage).While being the product maximum of the efficiency of converters at different levels in described multistage converters system due to busbar voltage optimal solution, the magnitude of voltage of the bus between adjacent two converters of corresponding rank, therefore according to busbar voltage optimal solution, for corresponding bus arranges corresponding magnitude of voltage, corresponding bus sets after corresponding magnitude of voltage, the efficiency product of converters at different levels is maximum, thereby it is maximum that the efficiency that makes multistage converters system reaches, optimized the efficiency of multistage converters system.
Visible, the application is by making the efficiency of multistage converters system reach maximum to the optimization of control method, do not rely on the innovation of any device, having reduced the cost of whole multistage converters system.
Another embodiment
In the present embodiment, what illustrate is in the situation that multistage converters system is two stage power electronic converter system, the generative process of busbar voltage optimal solution, refer to Fig. 2, shown in Fig. 2 is a kind of sub-process figure of the control method of the multistage converters system that provides of the application, can comprise the following steps:
Step S21: fixedly in the situation that, determine the adjusting range of two busbar voltages between converter at input/output condition.
The adjusting range of determining two busbar voltages between converter is specially: withstand voltage according to the physical circuit device that topological sum is used of the input and output voltage condition of two stage power electronic converter system and converters at different levels, determine the adjusting range of described busbar voltage.
Step S22: each self-corresponding efficiency while measuring respectively each magnitude of voltage in described busbar voltage is described adjusting range of two converters.
Owing to only having a bus between two converters, therefore the adjusting range of the busbar voltage of two converters is identical.
Now for example each self-corresponding efficiency describes when measuring respectively each magnitude of voltage in described busbar voltage is described adjusting range of two converters, for example two converters are respectively front stage converter and rear class converter, corresponding efficiency and corresponding efficiency while measuring each magnitude of voltage in busbar voltage is adjusting range of rear class converter while measuring each magnitude of voltage in busbar voltage is adjusting range of front stage converter.If the input voltage of two stage power electronic converter system is that 220VAC is constant, the adjusting range of busbar voltage can be 350V～420V so, measurement translator in busbar voltage is adjusting range 350V～420V each magnitude of voltage (as 350V, 360V, 370V, 380V, 390V, 400V, 410V and 420V) time corresponding efficiency (as efficiency 1, efficiency 2, efficiency 3, efficiency 4, efficiency 5, efficiency 6, efficiency 7 and efficiency 8), wherein, the corresponding 350V of efficiency 1, the corresponding 360V of efficiency 2, the corresponding 370V of efficiency 3, the corresponding 380V of efficiency 4, the corresponding 390V of efficiency 5, the corresponding 400V of efficiency 6, the corresponding 410V of efficiency 7, the corresponding 420V of efficiency 8.
What take in the present embodiment, is the mode of the measurement translator efficiency that each magnitude of voltage is corresponding in described busbar voltage is described adjusting range.
Step S23: the product that calculates the efficiency of two converters that in described adjusting range, each magnitude of voltage is corresponding.
Now to calculating the product of the efficiency of two converters that in described adjusting range, each magnitude of voltage is corresponding, describe for example, for example, in adjusting range, each magnitude of voltage is respectively 350V, 360V, 370V, 380V, 390V, 400V, 410V and 420V, two converters are respectively front stage converter and rear class converter, and the efficiency of the front stage converter that 350V is corresponding is efficiency a
1, the efficiency of corresponding rear class converter is efficiency b
1, the efficiency of the front stage converter that 360V is corresponding is efficiency a
2, the efficiency of corresponding rear class converter is efficiency b
2, the efficiency of the front stage converter that 370V is corresponding is efficiency a
3, the efficiency of corresponding rear class converter is efficiency b
3..., the efficiency of the front stage converter that 420V is corresponding is efficiency a
8, the efficiency of corresponding rear class converter is efficiency b
8, the efficiency a of the front stage converter that calculating 350V is corresponding
1efficiency b with rear class converter
1product, calculating product is a
1* b
1, the efficiency a of the front stage converter that calculating 360V is corresponding
2efficiency b with rear class converter
2product, calculating product is a
2* b
2, the efficiency a of the front stage converter that calculating 370V is corresponding
3efficiency b with rear class converter
3product, calculating product is a
3* b
3..., the efficiency a of the front stage converter that calculating 420V is corresponding
8efficiency b with rear class converter
8product, calculating product is a
8* b
8.
Step S24: according to the result of calculating, determine that the magnitude of voltage that max product is corresponding is busbar voltage optimal solution.
In the present embodiment, using magnitude of voltage corresponding to max product as busbar voltage optimal value, as: if a in the example in step S23
8* b
8for max product, a
8* b
8corresponding magnitude of voltage is busbar voltage optimal solution.
During each magnitude of voltage in described busbar voltage is described adjusting range of two converters that measure, each self-corresponding efficiency can characterize by efficiency change line.Efficiency change line specifically can be referring to Fig. 3, Fig. 3 shows a kind of schematic diagram of the efficiency change line that the application provides, transverse axis in Fig. 3 is busbar voltage, Vbus1～Vbus2 is the adjusting range of definite busbar voltage, the longitudinal axis is efficiency, e1 is busbar voltage corresponding efficiency while being Vbus2, and e2 is busbar voltage corresponding efficiency while being Vbus1.
The two stage power electronic converter system of now still take is example, the generative process of the efficiency change line of each self-corresponding efficiency when characterizing each magnitude of voltage in described busbar voltage is described adjusting range of two converters, and the process of definite busbar voltage optimal solution describes.For example: at initial conditions, fix, in the unfixed situation of output condition:
Steps A 11: the adjustable range of determining intermediate variable (busbar voltage).If front stage converter is boost converter, input voltage is that 220VAC is constant, and the adjusting range of busbar voltage can be 350V～420V so.
Steps A 12: corresponding efficiency while measuring each magnitude of voltage in described busbar voltage is described adjusting range of front stage converter, obtains efficiency change line.Input voltage is fixed as civil power, and power output is that real work power immobilizes.The amount of unique variation is busbar voltage.By actual measurement, can obtain transverse axis is busbar voltage, and the longitudinal axis is efficiency corresponding to each magnitude of voltage in busbar voltage adjusting range, and efficiency change line as shown in Figure 3.
Steps A 13: corresponding efficiency while measuring each magnitude of voltage in described busbar voltage is described adjusting range of rear class converter, obtain efficiency change line, output voltage can be chosen representational several groups of data in output voltage range, such as 220, these four points of 300,400,450V.Power output is that real work power immobilizes.We can be on each representational output voltage point, by actual measurement, obtaining transverse axis is busbar voltage, the longitudinal axis is efficiency corresponding to each magnitude of voltage in busbar voltage adjusting range, as shown in Figure 4, shown in Fig. 4 is the another kind of schematic diagram of the efficiency change line that provides of the application to efficiency change line.
Because output voltage has been chosen these four points of 220,300,400,450V, so rear class converter corresponding efficiency change line on each output voltage point, 4 efficiency curves finally obtained.
Steps A 14: when 2 stage converter tandem working, suppose that now output voltage is on this aspect of 220V, call efficiency change line and the efficiency curve of rear class converter on this aspect of 220V of front stage converter and do the operation of multiplying each other, find the point of product maximum, this puts the busbar voltage optimal solution that corresponding busbar voltage is exactly whole system, the i.e. best operating point of whole system.If output voltage rises to 300V, call curve that rear class 300V is corresponding for calculating.By that analogy.If output voltage on certain numerical value between these particular job points, can adopt way or other similar ways of matching, indirectly obtain rear class converter at the efficiency change line of this working point, obtain best busbar voltage.
Another embodiment
In the present embodiment, three-class power electronic converter system is determined to the process of efficiency change line of converters at different levels and the process of definite busbar voltage optimal solution describe.
In input and output voltage condition fixedly in the situation that:
Steps A 21: the adjusting range of determining the busbar voltage on intergrade both sides
Withstand voltage according to the physical circuit device that topological sum is used of the input and output voltage scope of converter and converters at different levels, determines the busbar voltage 1(Vbus1 between prime and intergrade) adjusting range and the busbar voltage 2(Vbus2 between intergrade and rear class) adjusting range.
Steps A 22: the efficiency change line that obtains front stage converter
Input voltage is fixed as specified input voltage, and power output is actual rated power.The amount of unique variation is busbar voltage Vbus1.By actual measurement, can obtain transverse axis is busbar voltage Vbus1, and the longitudinal axis is efficiency corresponding to each magnitude of voltage in the adjusting range of Vbus1, obtains the efficiency transformation line of front stage converter.
Steps A 23: the efficiency change line that obtains rear class converter
Output voltage is fixed as rated output voltage, and power output is actual rated power.The amount of unique variation is busbar voltage Vbus2.By actual measurement, can obtain transverse axis is busbar voltage Vbus2, and the longitudinal axis is efficiency corresponding to each magnitude of voltage in the adjusting range of Vbus2, obtains the efficiency change line of rear class converter.
Steps A 24: the efficiency change line that obtains intergrade converter
In the working range of Vbus1, select the point of suitable quantity, for example: Vbus11, Vbus12, Vbus13, for different Vbus1, we can measure different take Vbus2 as transverse axis, efficiency is the efficiency change line of the longitudinal axis, and power output is that real work power immobilizes.
Steps A 25: obtain optimal working point (busbar voltage optimal solution) according to efficiency change line
When three grades of converter tandem workings, input voltage and output voltage are rated voltage.Call respectively the efficiency change line of front stage converter at Vbus11, Vbus12, the efficiency change line that the efficiency value of these points of Vbus13 and intergrade converter are corresponding and the efficiency change line of rear class converter carry out phase multiplication, find the point of product maximum, this puts corresponding busbar voltage Vbus1 and Vbus2 is exactly the best operating point of whole system now.For previously selected Vbus11, Vbus12, the point in the middle of Vbus13 data, can adopt the method for matching to obtain, and finds more accurate optimum point.
In the unfixed situation of output voltage:
Steps A 21, steps A 22, steps A 24 steps are constant.
Steps A 23 becomes:
In the working range of output voltage, select the point of suitable quantity, for example: Vo1, Vo2, Vo3, for different Vo, we can measure take different Vbus2 as transverse axis, efficiency is the efficiency change line of the longitudinal axis, and power output is that real work power immobilizes.
Steps A 25 becomes:
The efficiency change line of rear class converter will call efficiency change line corresponding to current output voltage, if current output voltage (is Vo1 at selected numerical value, Vo2, Vo3) between, can obtain efficiency change line corresponding to current output voltage by the way of matching.The efficiency change line of front stage converter is at Vbus11, Vbus12, the efficiency change line of the corresponding current output voltage of each efficiency change line that the efficiency value of these points of Vbus13 and intergrade are corresponding and rear class converter multiplies each other, find the maximum of product, maximum corresponding Vbus1 and the Vbus2 of product is exactly best operating point corresponding to current output voltage (being busbar voltage optimal solution corresponding to current output voltage).If output voltage changes, can recalculate and obtain corresponding best operating point according to above-described way.
In the unfixed situation of input voltage, the process in situation as unfixed in output voltage, does not repeat them here.
Certainly for the process of efficiency change line and the process of efficiency change line of the process of definite busbar voltage optimal solution and three-class power electronic converter system and the unity of thinking of the process of definite busbar voltage optimal solution of three grades of above multistage converters systems, do not repeat them here.
Another embodiment
In the present embodiment, what illustrate is in the situation that multistage converters system is two stage power electronic converter system, the another kind of generative process of busbar voltage optimal solution, refer to Fig. 5, shown in Fig. 5 is the another kind of sub-process figure of the control method of the multistage converters system that provides of the application, can comprise the following steps:
Step S51: fixedly in the situation that, determine the adjusting range of two busbar voltages between converter at input/output condition.
Step S52: each self-corresponding efficiency while measuring respectively each representative magnitude of voltage in described busbar voltage is described adjusting range of two converters.
In the present embodiment, in adjusting range, choose several representative magnitudes of voltage, each self-corresponding efficiency while measuring each representative magnitude of voltage in described busbar voltage is described adjusting range of two converters.
Step S53: adopt fitting algorithm to obtain two converters corresponding efficiency during the magnitude of voltage except representative magnitude of voltage in described busbar voltage is described adjusting range.
In the present embodiment, when measuring respectively each representative magnitude of voltage in described busbar voltage is described adjusting range of two converters after each self-corresponding efficiency, adopt fitting algorithm to obtain two converters corresponding efficiency during the magnitude of voltage except representative magnitude of voltage in described busbar voltage is described adjusting range, concrete: take transverse axis as busbar voltage, on transverse axis, identify the adjusting range of busbar voltage, the longitudinal axis be adjusting range in representative each self-corresponding efficiency of each magnitude of voltage, with a line, each self-corresponding efficiency of each magnitude of voltage representative in adjusting range is coupled together, depict an efficiency change line, from the efficiency transformation line of depicting, can get efficiency corresponding to the magnitude of voltage except representative magnitude of voltage in described adjusting range.
Adopt the mode of fitting algorithm to obtain efficiency that in described adjusting range, the magnitude of voltage except representative magnitude of voltage is corresponding than efficiency corresponding to each magnitude of voltage of the measurement shown in Fig. 2, can calculate more accurately efficiency product corresponding bus voltage value when maximum, under the definite condition of input/output condition, can access more excellent busbar voltage optimal solution.
Step S54: the product that calculates the efficiency of two converters that in described adjusting range, each magnitude of voltage is corresponding.
Step S55: according to the result of calculating, determine that the magnitude of voltage that max product is corresponding is busbar voltage optimal solution.
For aforesaid each embodiment of the method, for simple description, therefore it is all expressed as to a series of combination of actions, but those skilled in the art should know, the application is not subject to the restriction of described sequence of movement, because according to the application, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in specification all belongs to preferred embodiment, and related action and module might not be that the application is necessary.
Embodiment is corresponding with said method, the application provides a kind of control device of multistage converters system, refer to Fig. 6, shown in Fig. 6 is a kind of structural representation of the control device of the multistage converters system that provides of the application, and the control device of multistage converters system comprises: the first determining unit 61, the first acquiring unit 62 and setting unit 63.
The first determining unit 61, for determining the current input/output condition of described multistage converters system.
The first acquiring unit 62, for obtaining from preset data file the busbar voltage optimal solution that described current input/output condition is corresponding, described busbar voltage optimal solution is the product of the efficiency of converters at different levels in described multistage converters system when maximum, the magnitude of voltage of the bus between adjacent two converters of corresponding rank.
Setting unit 63, for according to described busbar voltage optimal solution, for corresponding bus arranges corresponding magnitude of voltage.
Wherein, the control device of the multistage converters system shown in Fig. 6 can comprise: the second determining unit, the first measuring unit, the first computing unit and the 3rd determining unit.The second determining unit, the first measuring unit, the first computing unit and the 3rd determining unit complete the deterministic process of busbar voltage optimal solution jointly, concrete:
The second determining unit, for fixedly in the situation that, determining the adjusting range of two busbar voltages between converter at input/output condition.
The second determining unit, withstand voltage specifically for according to the physical circuit device that topological sum is used of the input and output voltage condition of two stage power electronic converter system and converters at different levels, determines the adjusting range of described busbar voltage.
The first measuring unit, each self-corresponding efficiency when measuring respectively each magnitude of voltage in described busbar voltage is described adjusting range of two converters.
The first computing unit, for calculating the product of the efficiency of two converters that in described adjusting range, each magnitude of voltage is corresponding.
The 3rd determining unit, for the result according to calculating, determines that the magnitude of voltage that max product is corresponding is busbar voltage optimal solution.
Each self-corresponding efficiency when the included characterization unit of the control device of the multistage converters system shown in Fig. 6 can characterize each magnitude of voltage in described busbar voltage is described adjusting range of two converters that the first measuring unit measures by efficiency change line.
The control device of the multistage converters system shown in Fig. 6 can comprise: the 4th determining unit, the second measuring unit, second acquisition unit, the second computing unit and the 5th determining unit.The 4th determining unit, the second measuring unit, second acquisition unit, the second computing unit and the 5th determining unit also can complete the deterministic process of busbar voltage optimal solution jointly, concrete:
The 4th determining unit, for fixedly in the situation that, determining the adjusting range of two busbar voltages between converter at input/output condition.
The 4th determining unit, withstand voltage specifically for according to the physical circuit device that topological sum is used of the input and output voltage condition of two stage power electronic converter system and converters at different levels, determines the adjusting range of described busbar voltage.
The second measuring unit, each self-corresponding efficiency when measuring respectively each representative magnitude of voltage in described busbar voltage is described adjusting range of two converters.
Second acquisition unit, for adopting fitting algorithm to obtain two converters corresponding efficiency during the magnitude of voltage except representative magnitude of voltage in described busbar voltage is described adjusting range.
The second computing unit, for calculating the product of the efficiency of two converters that in described adjusting range, each magnitude of voltage is corresponding.
The 5th determining unit, for the result according to calculating, determines that the magnitude of voltage that max product is corresponding is busbar voltage optimal solution.
It should be noted that, each embodiment in this specification all 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 device class embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part is referring to the part explanation of embodiment of the method.
Finally, also it should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
While for convenience of description, describing above device, with function, being divided into various unit describes respectively.Certainly, when implementing the application, the function of each unit can be realized in same or a plurality of software and/or hardware.
Control method and the device of a kind of multistage converters system above the application being provided are described in detail, applied specific case herein the application's principle and execution mode are set forth, the explanation of above embodiment is just for helping to understand the application's method and core concept thereof; Meanwhile, for one of ordinary skill in the art, the thought according to the application, all will change in specific embodiments and applications, and in sum, this description should not be construed as the restriction to the application.
Claims (10)
1. a control method for multistage converters system, is characterized in that, comprising:
Determine the current input/output condition of described multistage converters system;
From preset data file, obtain the busbar voltage optimal solution that described current input/output condition is corresponding, described busbar voltage optimal solution is the product of the efficiency of converters at different levels in described multistage converters system when maximum, the magnitude of voltage of the bus between adjacent two converters of corresponding rank;
According to described busbar voltage optimal solution, for corresponding bus arranges corresponding magnitude of voltage.
2. method according to claim 1, is characterized in that, in the situation that described multistage converters system is two stage power electronic converter system, the generative process of described busbar voltage optimal solution, comprising:
At input/output condition, fixedly in the situation that, determine the adjusting range of two busbar voltages between converter;
Each self-corresponding efficiency while measuring respectively each magnitude of voltage in described busbar voltage is described adjusting range of two converters;
Calculate the product of the efficiency of two converters that in described adjusting range, each magnitude of voltage is corresponding;
According to the result of calculating, determine that the magnitude of voltage that max product is corresponding is busbar voltage optimal solution.
3. method according to claim 1, is characterized in that, in the situation that described multistage converters system is two stage power electronic converter system, the generative process of described busbar voltage optimal solution, comprising:
At input/output condition, fixedly in the situation that, determine the adjusting range of two busbar voltages between converter;
Each self-corresponding efficiency while measuring respectively each representative magnitude of voltage in described busbar voltage is described adjusting range of two converters;
Adopt fitting algorithm to obtain two converters corresponding efficiency during the magnitude of voltage except representative magnitude of voltage in described busbar voltage is described adjusting range;
Calculate the product of the efficiency of two converters that in described adjusting range, each magnitude of voltage is corresponding;
According to the result of calculating, determine that the magnitude of voltage that max product is corresponding is busbar voltage optimal solution.
4. method according to claim 2, is characterized in that, each self-corresponding efficiency during each magnitude of voltage in described busbar voltage is described adjusting range of two converters that measure, characterizes by efficiency change line.
5. according to the method in claim 2 or 3, it is characterized in that, the deterministic process of described adjusting range, is specially:
Withstand voltage according to the physical circuit device that topological sum is used of the input and output voltage condition of two stage power electronic converter system and converters at different levels, determines the adjusting range of described busbar voltage.
6. a control device for multistage converters system, is characterized in that, comprising:
The first determining unit, for determining the current input/output condition of described multistage converters system;
The first acquiring unit, for obtaining from preset data file the busbar voltage optimal solution that described current input/output condition is corresponding, described busbar voltage optimal solution is the product of the efficiency of converters at different levels in described multistage converters system when maximum, the magnitude of voltage of the bus between adjacent two converters of corresponding rank;
Setting unit, for according to described busbar voltage optimal solution, for corresponding bus arranges corresponding magnitude of voltage.
7. device according to claim 6, is characterized in that, comprising:
The second determining unit, for fixedly in the situation that, determining the adjusting range of two busbar voltages between converter at input/output condition;
The first measuring unit, each self-corresponding efficiency when measuring respectively each magnitude of voltage in described busbar voltage is described adjusting range of two converters;
The first computing unit, for calculating the product of the efficiency of two converters that in described adjusting range, each magnitude of voltage is corresponding;
The 3rd determining unit, for the result according to calculating, determines that the magnitude of voltage that max product is corresponding is busbar voltage optimal solution.
8. device according to claim 6, is characterized in that, comprising:
The 4th determining unit, for fixedly in the situation that, determining the adjusting range of two busbar voltages between converter at input/output condition;
The second measuring unit, each self-corresponding efficiency when measuring respectively each representative magnitude of voltage in described busbar voltage is described adjusting range of two converters;
Second acquisition unit, for adopting fitting algorithm to obtain two converters corresponding efficiency during the magnitude of voltage except representative magnitude of voltage in described busbar voltage is described adjusting range;
The second computing unit, for calculating the product of the efficiency of two converters that in described adjusting range, each magnitude of voltage is corresponding;
The 5th determining unit, for the result according to calculating, determines that the magnitude of voltage that max product is corresponding is busbar voltage optimal solution.
9. device according to claim 7, is characterized in that, comprising:
Characterization unit, for characterizing by efficiency change line, each self-corresponding efficiency during each magnitude of voltage in described busbar voltage is described adjusting range of two converters that measure.
10. according to the device described in claim 7 or 8, it is characterized in that, withstand voltage specifically for according to the physical circuit device that topological sum is used of the input and output voltage condition of two stage power electronic converter system and converters at different levels of described the second determining unit or the 4th determining unit, determines the adjusting range of described busbar voltage.
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