Research And Development On The Web-based DC Filter Design Software

With the vigorous development of China's economy,there will be more and more HVDC and UHVDC transmission projects.The efficiency and accuracy of the system design are particularly important.In the process of design,the design of DC filter is very crucial and complicated.It needs to consider many factors in engineering,such as operating conditions,wiring methods and parameter deviation.After the repeated and iterative design,good performance and better economic benefits are expected to be achieved.In order to make it more flexible and efficient to design DC filter,it is necessary to develop a Web-based DC filter design software.Based on the above,the thesis mainly has done the related work as follows:In the first chapter,the background of the research is briefly introduced.At the same time,the present research status of DC transmission line model and the development of DC filter design software are summarized.In the second chapter,the three-tier architecture and MVC design patterns are first introduced.Then,the function modules in this software are sorted out.In order to improve the extendibility,maintainability and reusability of the code,the three-tier architecture combined with MVC is chosen to develop the DC filter design software.At last,the overall solution and architecture design of the software are proposed.In the third chapter,transmission line's mathematical model based on phase-mode transformation is proposed to solve the harmonic current of DC transmission lines.Next,the accuracy of the model has been verified by comparing the calculation results of this algorithm and HAP,which is developed by ABB for AC analysis of electrical networks.In the fourth chapter,the principle of the DC filter parameter calculation is analyzed.And then,the detailed program flow charts and the instructions for using this module are offered.Performance calculation and rated-value calculation of the DC filter design are studied in the fifth and sixth chapter separately.First of all,the two modules' function are descripted briefly.In addition,the program flow charts and the instructions of these two modules are given.Finally,the results of two examples show the validity of both the performance and rated-value calculation.