A trend‐based approach for situation awareness in power systems

Abstract

Summary Situation awareness plays a main role in the security monitoring and control of power system operation. Previous approaches for enhancement of situation awareness mainly focus on state estimation, security analysis, and visual perception. As an effective tool to automatically identify the trend features of a continuously changing process, the trend analysis technique may be used to enhance the situation awareness of the power system. This paper proposes an enhanced framework of situation awareness by means of the qualitative trend analysis. The enhanced framework consists of 3 levels: the perception of information, the security assessment of the current state, as well as the prediction of the future system states and their trends. Based on the perceived information, the N‐1 steady‐state security distance model is introduced to assess the security levels of both the current and future system states. With the combination of the security distance model and the qualitative trend analysis, a trend‐based approach is derived to capture trend features—the moving direction of the operating points and the changing rate of tendency—of future changing states automatically. Application results of IEEE 118‐bus system and a practical power system show that the trend‐based approach could be effectively used to assist system operators in monitoring, predicting, and preventing potential problems.

Decoupling and dimension reduction method for distribution system security region

“…By using the method proposed in this paper, the dimension of DSSR is reduced from 28 to 12. Therefore, the time complexity of DSSR calculation algorithm is also reduced from O(n 28 ) to O(n 12 ), which reduces more than 50%. The sampling step s when sampling the strict boundary is 10MVA.…”

“…Based on 'region' method, the maximum uncertainty of active distribution system is described by the upper bound of operating points satisfying voltage and current constraints [11]. The trend characteristics of power systems can be obtained through situation awareness methods [12,13]. The minimum variance coefficient of security distance is taken as an objective function in the new network reconfiguration model to show that the model can satisfy N-1 security [14].…”

Frequency coordinated control strategy of HVDC sending system with wind power based on situation awareness

“…SA is a key factor in preserving power system security, as it enables effective and timely decision-making and reactions by the operators to an incident [19]. SA of FCC mainly includes three layers: the perception layer extracts situation elements through data acquisition and monitoring system and wide area monitoring system; the understanding layer processes and analyses the information of situation elements extracted by the perception layer, and evaluates the ability of FCC by constructing a perfect index system.…”

“…SA is an environment-based, dynamic and holistic ability to understand security risks [18]. Power system SA is to understand, evaluate and predict the operation trajectory of power system by collecting on-line data such as generation data, load data, and offline information such as equipment parameters and power network topology [19,20]. The introduction of SA can effectively grasp the operation status of the transmission system, understand and predict the situation according to the frequency value detected in real-time, and actively coordinate wind turbine and DC transmission to participate in frequency regulation through situation guidance.…”

Dimension of distribution system security region: concept, calculation and application

“…Based on 'region' method, the maximum uncertainty of active distribution system is described by the upper bound of working points satisfying voltage and current constraints [11]. The trend characteristics of power systems can be obtained through situation awareness methods [12,13]. The minimum variance coefficient of security distance is taken as an objective function in the new network reconfiguration model to show that the model can satisfy N−1 security [14].…”