机械设计制造及其自动化毕业设计外文翻译(5000字)(共15页).doc

精选优质文档-倾情为你奉上 毕业论文题目: 风力太阳能混合 发电控制系统的研究 学生姓名: 专业名称: 机械设计制造及其自动化 指导教师: 2011年2月3日Energy Management System of Admixture Electricity-generating1. One preface The admixture that wind force and solar cells generate electricity to constitute generates electricity the system and is called the breeze/ light to repair the system with each other, all having some common weakness because of the breeze and solar energies, such as the energy density low, the stability is bad and is subjected to the weather influence not to continue, have the strong weak conjugation, solar energy of seasonal to interrupted etc. day and night. Be generate electricity by the wind force and solar energy respectively to the power supply, the credibility of its power supply lowers consumedly.The wind energy, solar energy has to repair sex with each other certainly, if the sun light of daytime is strong, the night breeze is many, the summer sunshine good, the breeze is weak; The spring stanza breeze of winter is strong but the sunlight is opposite weaker. Develop the wind force a solar energy to supply again to give or get an electric shock the system with each other, take into wind force and the solar energy techniques to synthesize the exploitation, thus constitute a kind of repair with each other of can scatter the new energy that cloth order, will is a new growth to order in this energy structure of century. Have the condition pass the storage battery of match the appropriate capacity or connect into the city to give or get an electric shock the conduct and actions back up power supply, can make circulate the expenses to lower consumedly, huge exaltation of the credibility of the power supply.Local mainly generate electricity to independent wind power, the light currently and the breeze a light supplies again the research of the electricity control system with each other more. In design the breeze a light generate electricity system, the design way of thinking of the widespread adoption according to load everyday total to consume the electricity quantity, and radiate the quantity from the day that the local weather data get to the capacity of the certain solar cell array, the wind power machine, then come certain can the renewable energy generate electricity the power and the storage battery capacities of control the devices, but at mix with the movement of generate electricity the system control and excellent turn the research of manage the method less. Because the exportation power and the burden powers of the breeze electrical engineering set, the solar cell array is affect by the outside factor, changing the scope to compare greatly, as a result turned the energy of generate electricity the system management to also put forward the higher request towards control and excellently. This text aims at the movement efficiency and credibilitys that the characteristics of the system movement designs one energy management system( energy management system, brief name EMS) to raise the system.composing of the systemsThis text with the south science and engineering university dispersion type wind force a solar energy of the new energy center admixture generates electricity the system for study the view, the structure diagram of the system, such as 2 1 of figure 1 show:May known by the chart 2-1, the system includes following several parties:The wind power machine and its controller: Total 15KW / sets of the biggest exportation power of the breeze machine, the wind force machine generates electricity the controller to make the wind force machine been placed in the biggest power to output the appearance always.Solar cell and its electricity generation controller: The altogether 5 groups, solar cell each group of peaks tile 3 k W, the solar energy electricity generation controller causes the solar cell array throughout to be at the maximum work rate output condition. The data collects the system:( the data acquires the system, the brief name DAS)Used for the electric voltage, the load power that collects to examine the solar cell exportation power, the wind power machine to output the power, the system direct current part, and circulate the relevant information to the system that collect, providing the energy management system to carry on the analytical processing. The energy manages the system: collect each function of system unit movement parameter that system provide according to the data, carry out the valid management to the system and controls. Buffer electric capacity: carry out parts of electric voltages of the system direct current steady. Load and inversion: The new energy center load classification, a kind of load is a load which the energy center work and the experiment must guarantee; Two kind of loads are the electrical energies which energy center ancillary facilities and so on greenhouse control needs, when the renewable energy output electrical energy has the unnecessary energy, only then invests load. The system load and the direct component connection is, the direct current side which realizes through the inversion after PWM inversion, transforms for the voltage is constant, the profile good exchange electrical energy, provides for the load. The city gives or get an electric shock the controller: When can the electricity that renewable energy provide can satisfy a load of system need, giving or get an electric shock from the city to make the complement; namely chase the city to give or get an electric shock the conduct and actions back up power supply, pass combine the net controller to control the devotion and the excision of the city electricity.In the wind power, the solar energy and the load constitution electricity generation, uses electricity in the system, as a result of the wind speed, the sunshine intensity and other climatic conditions changes, the wind electrical machinery, the solar cell array output and the load power all has comparatively wide range the undulation, thus set the very high request to the energy management system management system.This article in view of is being constructed a South China technical University new energy center disperser -like wind power solar energy mix generating system, has designed an energy management system management system, according to the system electricity generation, the load uses electricity the condition, the management system management system power supply pattern, nimbly adjusts each part to supply the electric quantity the proportion. The energy management system management system is bigger than the load demand when the renewable energy, shuts off the partial solar energies, the wind electrical machinery; When the renewable energy cannot satisfy the basic load request, in fully uses the renewable energy under the premise, is insufficient partially carries on the suitable supplement by the city electricity, takes the system the biggest load is 750 kW.In the power supply system, the system electricity generation and the load active power balance, is the system safe stable movement essential condition. Because the system load is provides by the Divulgate after the inversion, the DC voltage stable direct influence system provides the electrical energy to the load the quality, takes the system direct current EMBED Equation.3 voltage in here to control for the system the quantity, and takes its operating region is 192 V - 240V, chooses 216 V for the direct component rated voltage. In order to does not make the system the structure too to be complex, processing did not consider in here to the accumulator cell. Namely energy management system management system structure drawing like chart 2 2 show: EMBED Equation.3 , EMBED Equation.3 , EMBED Equation.3 , EMBED Equation.3 and EMBED Equation.3 difference for female line electric voltage, exportable and biggest power in the wind force machine, exportable and biggest power, system in the solar cell array of the direct current of the system a the type load the power and two loads needed need of power; EMBED Equation.3 and EMBED Equation.3 output to make use of the coefficient and the solar cell arrays to output the utilization for the wind force machine of the system with respectively, namely count to amount it with the wind force machine for the set that the wind force machine be in use than, for the number and the solar energy array set total amount that the solar energy array be in use than. Take EMBED Equation.3 、 EMBED Equation.3 EMBED Equation.3 0,0.2,0.4,0.6,0.8,1， EMBED Equation.3 and EMBED Equation.3 mean the number that the set number and the solar cell arrays that the wind force machine be in use be in use respectively; EMBED Equation.3 和 EMBED Equation.3 give or get an electric shock the switch control to change the quantity for the city respectively and two the types load of provide the rate, this text define EMBED Equation.3 、 EMBED Equation.3 for the switch function, take the value "0" or "1" When EMBED Equation.3 mean that the charged barbed wire net connects into the admixture to generate electricity the system, EMBED Equation.3 0 mean that the charged barbed wire net generates electricity the system from the admixture to cut off; EMBED Equation.3 mean that two loads connect into the admixture to generate electricity the system devotion work, EMBED Equation.3 = 0 mean that two loads generate electricity the system excision from the admixture.Aim at the characteristics of the system movement, draw up the following design rule:(1)Rule aA power of the breeze electrical engineering capacity that constitutes to mix with to generate electricity the system is more and greatly, as a result the choice regard a power supply of the breeze electrical engineering as principle, the solar cell array is the energy tiny adjust the part.(2)Rule two According to the system work characteristic, takes the direct current side terminal voltage EMBED Equation.3 expected value is 216 V, when the renewable energy may output the maximum work rate is bigger than the load request, the renewable energy to the electrical network does not transport the electrical energy.(3)Rule three Takes when here the direct current generator voltage is lower than 192 V, through incorporates the controller to put through the electrical network, by the city electricity supplemented the load needs the short partial electrical energies, and the incorporation controller which the chapter introduced by this article behind causes the direct current generator voltage to maintain 192 V, namely EMBED Equation.3 When attracts > 200 V, closure incorporation controller, then EMBED Equation.3 = 0(4)Rule four Two loads are several: Generate electricity the system for the admixture in the electric power that the assistance facilities need, when can the renewable energy exportation electric power contain surplus of energy, the load that just throw in.In two kind of loads working condition, its load power examination has not been more difficult, in order to avoid two kind of loads frequently throwing ; This article according to the system the load disposition situation, supposes two kind of loads maximum works reties EMBED Equation.3 , when EMBED Equation.3 + EMBED Equation.3 EMBED Equation.3 + EMBED Equation.3 Circulate two load devotions, namely EMBED Equation.3 1(5)Rule five In order to enhance the system direct component voltage the stability, when attracts < 204 V, withdraws two kind of loads from the system, namely EMBED Equation.3 0 When EMBED Equation.3 > 230 V, automatically two kind of loads investments movement, namely EMBED Equation.3 1 When EMBED Equation.3 > 240 V, the automatic excision all renewable energy electric power facility carries on the power supply to the direct current generator, namely EMBED Equation.3 = EMBED Equation.3 = EMBED Equation.3 =0， EMBED Equation.3 1Inputs the multi- outputs, the change complex characteristic in view of the system, this system uses in the intelligent control the fuzzy control technology (Fuzzy Control, is called FC) to realize to the system carries on the management and the control; Studied and has designed one kind based on the graduation fuzzy control (Hierarchical Fuzzy Control, was called HFC) the algorithm energy management system management system.3. Misty controlsThe fuzzy set with the fuzzy control concept is by American University of California famous Professor L. A. Z a d e h in it Fuzzy Sets，Fuzzy Algorithm and Rationale for Fuzzy Control and so on famously discusses center first was proposing one kind is completely different with the traditional mathematics and the control theory intelligent theory. Its production not only developed the broad classical mathematics foundation, moreover was causes the computer science to simulate the significant breakthrough which the human thought aspect developed.The faintness gather to come out the person's judgment, the thinking process with the direct expression of more simple language and mathematics forms. The mode of thinking that makes complicated system press mankind carry on operation and processings' make possible, lay the foundation for the formation of the misty controller, and get the scholar of the international community and the engineering technical personnel's extensive value and applications.The fuzzy control through the fuzzy set with the logical inference method person's experience formalization, the simulation, turns the control model and the language which the computer may accept, lets the computer replace the person to carry on the effective real-time control. Fuzzy controller composition diagram like chart 2 - 3 showIt include: The importation quantity faintness turns to connect, knowledge base( database and the rule database), reason logically the machine to reach agreement the faintness to connect.(1)The faintness turns to connectThe importation of the misty controller is usually certain quantity, must after faintness turn change into the language that controller know or change the quantity then can be use by the controller, the faintness turns to connect is to convert the certain importation quantity as the faintness to measure, it is also the importation of the misty controller to connect.(2)Knowledge base The knowledge base description form mainly has two kinds of: Database and rule database. Database is deposits all importations and output to change to measure of all misty son gather of belong to one degree relation of vector value; If in order to continue the area, the t