Distribution Network Security Situation Awareness Method Based on Security Distance

Abstract

Situation awareness (SA) refers to the process of perception, comprehension, and state projection of the system, elements, and environmental factors within a volume of time and space. The security assessment is an important part of SA for distribution networks. In this paper, the distribution system security region (DSSR) is used for SA for the first time, and a security SA method based on security distance (SD) is proposed. First, based on the existing DSSR, which is defined as the set of all operating points (OPs) satisfying N − 1 security criterion, this paper supplements the N − 0 DSSR satisfying normal operating constraints. Second, calculate SDs between the OP and security boundaries to determine whether an OP is secure. If one is secure, its SDs can give the security margin; while if one is insecure, its SDs can give the degree of insecurity and the fault, or the overload components can be recognized via the cross security boundary analysis. The situation comprehension for the distribution network security is realized through the above-mentioned information. Third, the security level of distribution networks in the future can be predicted by the trends of SDs. Finally, the feasibility and effectiveness of the proposed method are verified by an actual distribution network case.

Security-Constrained Day-Ahead Operational Planning for Flexible Hybrid AC/DC Distribution Networks

“…Results show that P2P configuration presented a much higher line power loading than the base case, in order to maximise the DG usage as well as demand shift. On the other hand, MVDC configuration not only presented lower DG curtailment and demand shift (as shown in previous subsection), but it also maintained the low line power loading during high demand (scenarios 1-16) and further decreased the loading during high DG output (scenarios [17][18][19][20][21][22][23][24][25][26]. This was due to the fact that the MVDC interface allowed a power exchange between multiple feeders.…”

“…It is assumed that the system is supported by 23 wind-based DGs with a capacity of 1.73 MW each. The total peak load is 24.274 MW and 4.855 MVar. The off-peak load is considered at 40% of the peak load.…”

“…Recently, a quantitative maximum DG output assessment was used in [23] based the concept of DSSR to guarantee the N − 1 secure operation of distribution networks. The work in [24] incorporated the situation awareness that involved three steps: Perception (i.e., data collection), comprehension (i.e., data analysis), and projection (i.e., data prediction) to carry out preventive actions toward any contingency events. However, the studies allow load interruptions during contingencies and lack of involvement from other network devices to react toward undesirable events.…”

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].…”

Network Security Situation Prediction Based on MR-SVM

“…However, there exist many network data attributes and huge amounts of data. Every day, massive amounts of data are generated, which poses a huge challenge to the use of algorithms [3], [4]. The amount of data increases the training time of the machine learning algorithm, and reduces its efficiency.…”