CN112818493A - New energy grid-connected equipment integrated design method and equipment - Google Patents
New energy grid-connected equipment integrated design method and equipment Download PDFInfo
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Abstract
The invention belongs to the technical field of new energy grid-connected power generation, and provides an integrated design method and equipment for new energy grid-connected equipment. The method comprises the steps of analyzing the coupling relation among a topological structure, a modulation mode and device parameters according to a topological structure and the device parameters of the new energy power grid-connected equipment, and constructing a three-layer nested optimization design model; inputting new energy power generation grid-connected data into a three-layer nested optimization design model, wherein the model takes efficiency, weight, volume and cost as optimization targets, takes a topological circuit, device parameters and a modulation strategy as optimization objects, obtains an optimization result by adopting different optimization methods for each layer, returns the obtained result to the previous layer, and iterates circularly until an optimal design scheme is obtained.
Description
Technical Field
The invention belongs to the technical field of new energy grid-connected power generation, and particularly relates to an integrated design method and equipment of new energy grid-connected equipment.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The grid-connected converter is an essential key link for new energy power generation, and bears the key task of efficient energy conversion, and the energy utilization rate and the grid-connected electric energy quality can be effectively improved through the high-performance grid-connected converter. The topological design is a core technology for realizing efficient and stable operation of the grid-connected converter, and is a hardware basis of new energy grid-connected equipment. However, new energy grid-connected equipment has various structures, complex power conversion paths and various device parameters, and topological structures, device type selection, modulation methods and the like are mutually coupled, so that once the design is improper, the equipment efficiency is low and the stability is poor, and therefore the topological design difficulty is extremely high.
The inventor finds that the optimization design of new energy grid-connected transformation equipment at present mainly focuses on improvement of a topological structure, selection of device parameters is also based on experience to carry out fuzzification design, and a comprehensive optimal topological design scheme based on multiple objectives is difficult to obtain.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a new energy grid-connected equipment integrated design method and equipment, which can quickly and accurately design optimal new energy grid-connected equipment based on a multi-objective optimization technology from the viewpoint of architecture-modulation-device integration.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a new energy grid-connected equipment integrated design method.
An integrated design method for new energy grid-connected equipment comprises the following steps:
analyzing the coupling relation among a topological structure, a modulation mode and device parameters according to a topological structure and the device parameters of the new energy power grid-connected equipment, and constructing a three-layer nested optimization design model;
inputting new energy power generation grid-connected data into a three-layer nested optimization design model, wherein the model takes efficiency, weight, volume and cost as optimization targets, takes a topological circuit, device parameters and a modulation strategy as optimization objects, obtains an optimization result by adopting different optimization methods for each layer, returns the obtained result to the previous layer, and iterates circularly until an optimal design scheme is obtained.
Further, in the first layer of the three-layer nested optimization design model, under the constraints of maximum efficiency, cost, volume and weight, a topological architecture optimization feasible set is established, the result is transmitted to the next layer, an optimization target value is calculated based on the next layer, and an optimal topological structure is selected.
Further, on the second layer in the three-layer nested optimization design model, based on the topology framework set determined by the previous layer, a modulation strategy feasible set meeting the selected topology conditions is constructed for each topology framework, under the constraints of maximum efficiency, grid-connected current harmonic waves and direct-current voltage utilization rate, based on the optimization target value of the third layer, the optimal modulation strategy is selected from the modulation feasible set, the optimization target value is returned to the first layer, and the modulation strategy is transmitted to the next layer.
Further, in the third layer of the three-layer nested optimization design model, a topology framework and a modulation strategy are determined based on the previous two layers, coupling relations among maximum and rated voltages, maximum and rated currents, maximum and rated powers and different device parameters are considered, optimal parameters are configured under the constraints of maximum efficiency, cost, volume and weight, and an optimization result is returned to the previous layer.
Furthermore, the first layer in the three-layer nested optimization design model utilizes a multi-attribute comprehensive decision theory, starts with various different attribute targets, comprehensively evaluates the circuit architecture, and outputs the circuit architecture to the second layer model.
Further, a second layer modulation strategy model in the three-layer nested optimization design model constructs a modulation strategy feasible set by using an enumeration method, calls a third layer parameter configuration model respectively, outputs a modulation strategy, and returns an optimization target value to the first layer.
Further, the third-layer parameter configuration in the three-layer nested optimization design model is solved by using a multi-objective genetic algorithm, device parameters and optimization target values are returned to the second layer, and iteration is performed in a circulating mode until an optimal topology design scheme is obtained.
The invention provides a new energy grid-connected equipment integrated design system.
The utility model provides a new forms of energy are incorporated into power networks and are equipped integration design system, includes:
the model building module is used for analyzing the coupling relation among a topological structure, a modulation mode and device parameters according to a topological structure and the device parameters of the new energy power grid-connected equipment and building a three-layer nested optimization design model;
and the model optimization module is used for inputting new energy power generation grid-connected data into a three-layer nested optimization design model, the model takes efficiency, weight, volume and cost as optimization targets, a topological circuit, device parameters and a modulation strategy as optimization objects, different optimization methods are respectively adopted by each layer to obtain an optimization result, the obtained result is returned to the previous layer, and iteration is performed in a circulating mode until an optimal design scheme is obtained.
A third aspect of the invention provides a computer-readable storage medium.
A computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps in the new energy grid-connected equipment integrated design method as described above.
The invention provides new energy grid-connected equipment, which is obtained by adopting the new energy grid-connected equipment integrated design method.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an integrated design method of new energy grid-connected equipment, which is characterized in that a coupling relation among a topological structure, a modulation mode and device parameters is analyzed according to a topological framework and device parameters of the new energy grid-connected equipment, and a three-layer nested optimization design model is constructed; the new energy power generation grid-connected data are input into a three-layer nested optimization design model, the model takes efficiency, weight, volume and cost as optimization targets, a topological circuit, device parameters and a modulation strategy as optimization objects, different optimization methods are adopted by each layer to obtain an optimization result, the obtained result is returned to the previous layer, and iteration is performed in a circulating mode until an optimal design scheme is obtained.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic diagram of an integrated design method of new energy grid-connected equipment according to an embodiment of the invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
The topological structure of the new energy power generation grid-connected equipment is mainly divided into a power electronic converter part and a filter part. The power electronic converter is divided into a single-phase half bridge, a single-phase full bridge and a three-phase bridge, wherein bridge arms mainly applied to the industry at present have two-level, I-type NPC three-level, T-type NPC three-level, ANPC five-level, cascaded H-bridge multi-level and MMC topological structures and the like, the types are various, and the optimal topological structure can be selected according to different application scenes. The filters mainly include L type, LCL type, LLCL type, etc., and different filters can be selected according to different harmonic wave requirements.
The new energy power generation grid-connected equipment comprises various devices such as switching devices, capacitors, reactors, cooling devices and the like. The switch device has parameters such as rated voltage, continuous leakage current, pulse leakage current and operation temperature, the reactor has parameters such as inductance, rated voltage, rated current, volume and heat dissipation, and other device parameters are similar.
The modulation strategies of the new energy power generation grid-connected equipment comprise SPWM, SVPWM, DPWM, SHEPWM and the like, different functions can be realized by different modulation strategies, and harmonic elimination and efficiency improvement are different.
The topology framework and device parameters of the new energy power grid-connected equipment need to be designed according to the new energy power generation grid-connected situation, the coupling relation among the topology structure, the modulation mode and the device parameters is analyzed, a three-layer cooperative interaction mechanism is established, a topology-modulation-device integrated design method is formed, and a three-layer nested optimization design model is established, as shown in fig. 1. Inputting new energy power generation grid-connected data into a three-layer nested optimization design model, wherein the model takes efficiency, weight, volume and cost as optimization targets, takes a topological circuit, device parameters and a modulation strategy as optimization objects, each layer of the three-layer nested optimization design model respectively adopts different optimization methods to obtain an optimization result, and returns the obtained result to the previous layer, and the iteration is carried out in a circulating mode until the optimal design scheme is obtained.
Specifically, the structure of the three-layer nested optimal design model is as follows:
the first layer is that according to the actual working condition, maximum and rated voltage, maximum and rated current, maximum and rated power, rated voltage and current parameters of a switching device and the like are considered, a topological framework optimization feasible set is established under the constraints of maximum efficiency, cost, volume and weight, the result is transmitted to the next layer, an optimization target value is calculated based on the next layer, and an optimal topological structure is selected.
And on the second layer, based on the topology framework set determined by the previous layer, constructing a modulation strategy feasible set meeting the selected topology conditions for each topology framework, selecting an optimal modulation strategy from the modulation feasible set based on the optimized target value of the third layer under the constraints of maximum efficiency, grid-connected current harmonic waves and direct-current voltage utilization rate, returning the optimized target value to the first layer, and transmitting the modulation strategy to the next layer.
And in the third layer, the optimal parameters are configured under the constraints of maximum efficiency, cost, volume and weight, and the optimization result is returned to the previous layer by considering the maximum and rated voltage, the maximum and rated current, the maximum and rated power and the coupling relation among different device parameters based on the determined topological architecture and modulation strategy of the previous two layers.
And each level of optimization model of the proposed three-layer integrated design model respectively obtains the design result of each layer by using different methods. The first layer utilizes a multi-attribute comprehensive decision-making theory, starts with various different attribute targets such as maximum efficiency, cost, volume, weight and the like, comprehensively evaluates the circuit architecture and outputs the circuit architecture to the second layer model; the second layer modulation strategy model constructs a modulation strategy feasible set by using an enumeration method, calls a third layer parameter configuration model respectively, outputs a modulation strategy and returns an optimization target value to the first layer; the third layer parameter configuration is solved by a multi-target genetic algorithm, and device parameters and an optimized target value are returned to the second layer; and circularly iterating until an optimal topological design scheme is obtained.
According to the new energy grid-connected equipment integrated design method, the coupling relation among a topological structure, a modulation mode and device parameters is analyzed according to the topological structure and the device parameters of the new energy grid-connected equipment, and a three-layer nested optimization design model is constructed; the new energy power generation grid-connected data are input into a three-layer nested optimization design model, the model takes efficiency, weight, volume and cost as optimization targets, a topological circuit, device parameters and a modulation strategy as optimization objects, different optimization methods are adopted by each layer to obtain an optimization result, the obtained result is returned to the previous layer, and iteration is performed in a circulating mode until an optimal design scheme is obtained.
Example two
The embodiment provides a new energy grid-connected equipment integrated design system, which specifically comprises the following modules:
the model building module is used for analyzing the coupling relation among a topological structure, a modulation mode and device parameters according to a topological structure and the device parameters of the new energy power grid-connected equipment and building a three-layer nested optimization design model;
and the model optimization module is used for inputting new energy power generation grid-connected data into a three-layer nested optimization design model, the model takes efficiency, weight, volume and cost as optimization targets, a topological circuit, device parameters and a modulation strategy as optimization objects, different optimization methods are respectively adopted by each layer to obtain an optimization result, the obtained result is returned to the previous layer, and iteration is performed in a circulating mode until an optimal design scheme is obtained.
It should be noted that, each module in the new energy grid-connected equipment integrated design system of the present embodiment corresponds to each step in the first embodiment one to one, and the specific implementation process is the same, which is not described herein again.
EXAMPLE III
The embodiment provides a computer-readable storage medium, on which a computer program is stored, and the program, when executed by a processor, implements the steps in the new energy grid-connected equipment integrated design method according to the first embodiment.
Example four
The embodiment provides new energy grid-connected equipment, which is obtained by adopting the new energy grid-connected equipment integrated design method in the first embodiment.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The new energy grid-connected equipment integrated design method is characterized by comprising the following steps:
analyzing the coupling relation among a topological structure, a modulation mode and device parameters according to a topological structure and the device parameters of the new energy power grid-connected equipment, and constructing a three-layer nested optimization design model;
inputting new energy power generation grid-connected data into a three-layer nested optimization design model, wherein the model takes efficiency, weight, volume and cost as optimization targets, takes a topological circuit, device parameters and a modulation strategy as optimization objects, obtains an optimization result by adopting different optimization methods for each layer, returns the obtained result to the previous layer, and iterates circularly until an optimal design scheme is obtained.
2. The integrated design method of the new energy grid-connected equipment according to claim 1, characterized in that at the first layer of the three-layer nested optimal design model, under the constraints of maximum efficiency, cost, volume and weight, a feasible set of topological architecture optimization is established, the result is transmitted to the next layer, and an optimal topological structure is selected based on the next layer to calculate an optimal target value.
3. The integrated design method of the new energy grid-connected equipment as claimed in claim 2, characterized in that at the second layer of the three-layer nested optimal design model, based on the topology framework set determined at the previous layer, for each topology framework, a feasible set of modulation strategies meeting the selected topology conditions is constructed, based on the optimal target value of the third layer, under the constraints of maximum efficiency, grid-connected current harmonics and direct-current voltage utilization, the optimal modulation strategy is selected from the feasible set of modulation, the optimal target value is returned to the first layer, and the modulation strategy is transmitted to the next layer.
4. The integrated design method of the new energy grid-connected equipment according to claim 3, characterized in that in the third layer of the three-layer nested optimization design model, the determined topological architecture and modulation strategy are based on the previous two layers, the coupling relations between the maximum and rated voltage, the maximum and rated current, the maximum and rated power and different device parameters are considered, the optimal parameters are configured under the constraints of maximum efficiency, cost, volume and weight, and the optimization result is returned to the previous layer.
5. The integrated design method of the new energy grid-connected equipment according to claim 1, characterized in that a first layer in a three-layer nested optimization design model utilizes a multi-attribute comprehensive decision theory, starts with various different attribute targets, comprehensively evaluates a circuit architecture, and outputs the circuit architecture to a second layer model.
6. The integrated design method of the new energy grid-connected equipment as claimed in claim 1, wherein a second layer modulation strategy model in a three-layer nested optimization design model utilizes an enumeration method to construct a feasible set of modulation strategies, respectively calls a third layer parameter configuration model, outputs the modulation strategies, and returns an optimization target value to a first layer.
7. The new energy grid-connected equipment integrated design method according to claim 1, characterized in that the third layer parameter configuration in the three-layer nested optimization design model is solved by a multi-objective genetic algorithm, device parameters and optimization target values are returned to the second layer, and iteration is performed in a circulating manner until an optimal topology design scheme is obtained.
8. The utility model provides a new forms of energy are incorporated into power networks and are equipped integration design system which characterized in that includes:
the model building module is used for analyzing the coupling relation among a topological structure, a modulation mode and device parameters according to a topological structure and the device parameters of the new energy power grid-connected equipment and building a three-layer nested optimization design model;
and the model optimization module is used for inputting new energy power generation grid-connected data into a three-layer nested optimization design model, the model takes efficiency, weight, volume and cost as optimization targets, a topological circuit, device parameters and a modulation strategy as optimization objects, different optimization methods are respectively adopted by each layer to obtain an optimization result, the obtained result is returned to the previous layer, and iteration is performed in a circulating mode until an optimal design scheme is obtained.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps in the new energy grid-connection equipment integrated design method according to any one of claims 1 to 7.
10. A new energy grid-connected equipment, characterized by being obtained by adopting the new energy grid-connected equipment integrated design method as claimed in any one of claims 1-7.
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