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Ding S.,Beijing Kedong Power Control System Co. | Li Y.,Xinjiang Electrical Power Dispatch Center | Du P.,Beijing Kedong Power Control System Co. | Meng X.,Beijing Kedong Power Control System Co. | And 2 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2016

To solve the increasingly prominent data quality problems about part of bad data in master station and substation in power SCADA system etc., a method for improving the data quality of power grid scheduling system is presented based on analyzing the current data quality in power grid scheduling system. This method obtains the data with optimal quality by utilizing advanced multi-source screening method and data verification technology between different systems applying the CIM/E based on CIM text as carrier and feedback data in substation according to state estimate in master station, improving the overall data quality in power grid scheduling system. New data quality optimization method, comparing with previous artificial remote comparing way, not only improves the degree of automation in data verification to save maintenance time in master station of power grid SCADA system, but also reduces bad data in master station and substation, so overall data quality is better than ever before. Practice has proved that the data quality optimization technology based on CIM/E in power grid scheduling system can effectively improve the data quality in power grid scheduling system, so it could ensure the power grid scheduling system run safely and stably. © 2016, Power System Protection and Control Press. All right reserved. Source


He H.-J.,Shanghai JiaoTong University | Xie D.,Shanghai JiaoTong University | Chang X.-Q.,Xinjiang Electrical Power Dispatch Center | Yao X.-P.,Xinjiang Electrical Power Dispatch Center
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

In traditional power system, scheme design methods for UFLS (under frequency load shedding) have only a few alternatives, and it is hard to make decisions due to the contradiction between performance indexes of alternative scheme. To solve the above problems, a novel alternative design method and scheme decision-making algorithm based on TOPSIS (Technique for Order Preference by Similarity to an Ideal Solution)are proposed. In this paper, the alternative design approach determines the calculation method of each parameter value-selecting set based on the composition of UFLS scheme and analysis of parameter characteristic, combines these values set organically according to the scheme structure, and finally forms an alternative set. The alternative set can cover a wide variety of schemes and can make decision directly by using the setting values of the set which avoids the performance index contradiction in traditional decision making and has strong practical applicability. At the same time, an optimal scheme decision making method based on the characteristic of decision method in UFLS and MADM of TOPSIS in optimal theory is discussed. This method provides specific ranks of alternatives by evaluating comprehensive properties of each scheme and solves the above problems. In the end, examples are given to demonstrate the validity and practicability of the above methods. Source


Yang G.-X.,Xinjiang University | Wang W.-Q.,Xinjiang University | Chang X.-Q.,Xinjiang Electrical Power Dispatch Center | Yao X.-P.,Xinjiang Electrical Power Dispatch Center
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

This paper analyzes high-frequency problems of end network including wind power emerged when the contact device trips and after local area splits in the weak-ending power grid of large-scale wind power integration and gives solutions. Taking Altay grid in Xinjiang for an example, it makes a simple introduction to the system frequency changing condition after local area and system separation with wind farm. For the possible high-frequency problems after local area network splitting, this paper proposes the leading-cutting strategy through the comparison with other two sub-round-cutting strategies. By means of a simulation with the Altay power grid, the paper obtains the expected results and has some reference value for wind farm to participate in frequency control in the power system. Source

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