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    Using Lacunaris algorithm the wavelet transform is programmed by programming language C, the correctness of the algorithm and program is verified by Microsoft Visual C++ 6.0 and Matlab simulation, so a realizable condition is provided for the development of power quality detection device which adopts the digital signal processor (DSP) as its operation kernel. Other problems to be solved in the development of short-term power quality detection device by DSP are also pointed out.
    利用多孔算法对小波变换进行C语言编程,并运用MicrosoftVisualC++6.0和Matlab仿真验证了算法和程序的正确性,为以数字信号处理器(DSP)芯片作为运算核心的检测装置的研制提供了可实现条件,还指出了利用DSP研制短时电能质量检测装置所应解决的其他问题
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    Furthermore, other problems relating to the estimators based on WAMS are also discussed, such as the bad data detection and identification, the phasor measurement unit (PMU) optimal placement and dynamic state estimation and harmonic state estimation based on PMUs.
    讨论了WAMS的不良数据检测与辨识问题、相量测量装置(PMU)的最优配置问题以及基于PMU的动态状态估计和谐波状态估计等与WAMS状态估计相关的其他问题
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Finally, the matrix approach can be similarly applied to other problems of signal representation.
      
This new method can be applied to many other problems, where wavelet bases are not available.
      
The application of finite automata to programming for other problems is also reviewed.
      
An analogous method may be used to construct, without quadratures, the solution of a number of other problems (a hydroplane, a grid, etc.).
      
The results obtained point to the possibility of using the proposed method to solve other problems of plane exponential filtration, generated by sources or sinks, particularly when they are arranged symmetrically.
      
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By means of comparing several short-term power quality disturbance detection methods, the superiority of wavelet analysis method is pointed out. Using Lacunaris algorithm the wavelet transform is programmed by programming language C, the correctness of the algorithm and program is verified by Microsoft Visual C++ 6.0 and Matlab simulation, so a realizable condition is provided for the development of power quality detection device which adopts the digital signal processor (DSP) as its operation kernel....

By means of comparing several short-term power quality disturbance detection methods, the superiority of wavelet analysis method is pointed out. Using Lacunaris algorithm the wavelet transform is programmed by programming language C, the correctness of the algorithm and program is verified by Microsoft Visual C++ 6.0 and Matlab simulation, so a realizable condition is provided for the development of power quality detection device which adopts the digital signal processor (DSP) as its operation kernel. Other problems to be solved in the development of short-term power quality detection device by DSP are also pointed out.

通过比较几种短时电能质量扰动检测方法,指出了小波分析方法所具有的优势。利用多孔算法对小波变换进行C语言编程,并运用MicrosoftVisualC++6.0和Matlab仿真验证了算法和程序的正确性,为以数字信号处理器(DSP)芯片作为运算核心的检测装置的研制提供了可实现条件,还指出了利用DSP研制短时电能质量检测装置所应解决的其他问题

Applying Ethernet technology as the communication mode in the substation automation system (SAS) is a new trend. For the equipment located in the bay level of low voltage SAS is arranged low, and it is generally difficult to download the realtime operation system (RTOS) and its implementation of Ethernet communication protocols. This paper studies some key issues in the implementation of embedded Ethernet software, and puts forward an embedded Ethernet software implementation structure characterized by multi-task,...

Applying Ethernet technology as the communication mode in the substation automation system (SAS) is a new trend. For the equipment located in the bay level of low voltage SAS is arranged low, and it is generally difficult to download the realtime operation system (RTOS) and its implementation of Ethernet communication protocols. This paper studies some key issues in the implementation of embedded Ethernet software, and puts forward an embedded Ethernet software implementation structure characterized by multi-task, time-sharing and layering. The space table method of fairly good real-time character is adopted to manage the memory, and message is organized in the dynamic mode. For the route and address resolution in the equipment located in the bay level of the substation, the equipment just supports the function of address resolution, and the gateway in substation is provided with the address resolution protocol (ARP) proxy, the implementation mode greatly reducing the complexity of the system. In addition, some other issues of the implementation of Ethernet are also discussed.

以太网已成为变电站自动化系统通信的发展趋势。低压变电站自动化系统的间隔层设备硬件平台配置较低,通常难以引入实时操作系统(RTOS)及其TCP/IP协议栈。文中研究了在低硬件配置平台上实现嵌入式以太网通信软件的若干关键问题,提出了一种多任务分时、分层的以太网通信软件结构;对内存采用实时性较好的空间表进行管理,对报文采用动态的组织和管理方式;对间隔层设备的路由和地址解析问题,间隔层设备只实现地址解析功能,变电站的外出网关设定地址解析协议(ARP)代理功能,从而大大降低了系统的复杂性。另外,还针对以太网实现中的其他问题进行了讨论。

The gradual development of the wide-area measurement system (WAMS) in China presents an opportunity to improve the on-line analysis methods of power system. Given such advantages of the WAMS as higher metering quality, possessing synchronized phasor measurements and fast data communications, the status quo on power system state estimation based on WAMS is reviewed and analyzed from three aspects, including the models of using nodal voltage phasor measurements with high accuracy, models of using branch current...

The gradual development of the wide-area measurement system (WAMS) in China presents an opportunity to improve the on-line analysis methods of power system. Given such advantages of the WAMS as higher metering quality, possessing synchronized phasor measurements and fast data communications, the status quo on power system state estimation based on WAMS is reviewed and analyzed from three aspects, including the models of using nodal voltage phasor measurements with high accuracy, models of using branch current phasor measurements with high accuracy and models of using all phasor measurements. This paper studies all these models in detail, comments on their advantages and disadvantages, gives some suggestion, and discusses the feasibility and application range from the point of view of the engineering application. Furthermore, other problems relating to the estimators based on WAMS are also discussed, such as the bad data detection and identification, the phasor measurement unit (PMU) optimal placement and dynamic state estimation and harmonic state estimation based on PMUs.

广域测量系统(WAMS)的逐步发展给电力系统在线分析方法提供了一个新思路。针对 WAMS测量精度高、具有同步相量测量功能以及数据传输快等特点,分别从引入高精度节点电压相量量测的状态估计算法、引入高精度支路电流相量量测的算法、引入全部WAMS量测的算法以及其他与WAMS状态估计相关的问题等4个方面,介绍了目前引入WAMS量测的各种状态估计算法;并详细分析了各种算法的优缺点和适用范围,从工程应用出发研究其可行性,对部分算法给出了改进措施。讨论了WAMS的不良数据检测与辨识问题、相量测量装置(PMU)的最优配置问题以及基于PMU的动态状态估计和谐波状态估计等与WAMS状态估计相关的其他问题

 
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