Advanced Materials Research Vols. 1070-1072

Abstract: The high-speed railway is a typical ground systems, if subjected to a larger GIC, will lead to serious incidents. For the power supply and wiring pattern of high-speed railway is different from the public grid, then how to monitor the GIC impact on the high-speed rail electrical systems need to be studied. The paper study the process and pattem of GIC in high-speed rail track circuit, and propose a signal acquisition method of GIC in the track circuit. The sampled signal will be go through the low-pass filter designed by the window function to obtain the GIC.

Abstract: Problems such as high cost of building a testing environment, low degree of automation and low rates of resource utilization are commonly met during the dispatching automation master system software testing. Cloud Computing technologies were introduced to solve these problems. Test methods based on the virtualization and other key technologies were studied and a testing platform includes user management module, testing resource management module, testing management module and man-machine interaction interface module was built. A method composed of three testing modes was presented which can be applied usefully in the static and dynamical testing of dispatching automation master system. Future research direction is prospected in the end of the paper.

Abstract: The traditional HMI ( human-machine interface ) of automatic safety device is lack of beauty and friendship. With the development of smart grid, there are more and more high requirements of the HMI. The automatic safety device was divided into the HMI module and the device main body. An industrial touch screen which supports for Modbus protocol, was selected as the HMI module of the automatic safety device. The HMI data was extracted into the standard data of Modbus protocol, and mapped to the unified address space of Modbus protocol. Modbus RTU mode was used to achieve the data communication between the HMI module and the device main body. This method not only makes the display content richer, interface more user-friendly, but also makes the product development cycle shorter and the product more scalable.

Abstract: Under the Large Operation mode of State Grid of china, the concentrated monitoring work on power devices is facing some serious problems and challenges. They are, monitoring information is not well structured, the amount of alarm information is quite huge and automatic fault diagnosis function is not smart enough. To handle these problems, this paper carried out comprehensive research on device monitoring oriented application system architecture, and proposed an overall solution on solving device monitoring problems from both substation and main stations. The realization of key modules of this architecture could greatly optimize the device monitoring oriented application system, and guide the incoming construction work on power dispatching and monitoring integration system.

Abstract: In order to solve the fault location problem of single phase to-earth fault in non-effectively grounded distribution network, a new fault location method based on transient frequency of zero-mode current was presented. The difference of transient frequency of zero-mode current between detecting points before and after the fault point is analyzed. This method is realized by the distribution automation (DA) system and does not require additional equipment. The zero-mode current is detected and the frequency of its transient component is calculated by the feeder terminal unit (FTU). The fault section can be located by master station according to comparing the transient frequency at different detecting point on the fault feeder. Results of digital simulation demonstrated the accuracy and feasibility of this method.

Abstract: Harmonic Analysis and control is very important for the power system because harmonics have serious harm to its normal operation. Harmonic Analysis uses fast Fourier transform (FFT) to solve this problem though it causes the spectrum leakage which Increases the calculation error. To solve this problem, the interpolation algorithm combine with tapered time windows are used. The tapered time windows solve the long-range leakage and the interpolation algorithm solves the problem of short-range leakage.

Abstract: The paper is devoted to implementation of Newton Method for evaluating power system points of collapse. Unlike conventional optimization procedures the proposed method doesn`t exploit loading parameter but allows to calculate Saddle-Node bifurcation point of power flow equations directly. The paper shows principal concept of the proposed method implementation to simplest power system model.

Abstract: Hami-Zhengzhou ±800kV DC project is the first ultra high-voltage project for Xinjiang power transmission, it is also the first DC transmission project binding thermal and wind power, with bipolar low-end operation in 2013 and bipolar operation in the middle of 2014. The rated power is 8,000MW. This article focused on Hami-Zhengzhou HVDC transmission system, established the electromechanical model, which improved commutation failure treatment in the traditional DC control system and made the simulation results more close to the real operation condition. Based on this model, security and stability analysis of power grid was carried out and the corresponding control strategies/schemes were brought up.

Abstract: Interconnection of distributed generators (DG) has obvious impacts on line loss in distribution system and the effects depend on interconnected location, interconnected number and power injection of distributed generation. With discrete distribution model of constant power static load system accessing DG into consideration, establishes the line loss minimum as the objective function of the model and optimizes interconnected location, interconnected number and power injection of DG using a quantum inspired evolutionary algorithm. IEEE33 diffset results show that the application of the model and the quantum-inspired evolutionary algorithm can get reasonable DG interconnected location and power injection, effectively reduce the distribution system line loss.

Abstract: This paper proposes a parallel computing method of topological analysis based on the partition of grid model data, and based on the smart grid dispatch control system it design and develop the parallel topology analysis service using the OpenMP shared memory programming model and C/C++ programming language. According to the layering and zoning features of the smart grid dispatch control system, this method divides the grid mode by area and power station. Package the topology search function and do parallel processing for mode data according to different area and power station, which can realize the parallel network topology analysis. The test result on the actual grid shows that this method has good stability and real-time, and it can meet the system online simulation, analysis and control applications requires for the topology analysis.