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New energy powers such as wind power and solar power technology taken into the power system increase random fluctuation in the system, and therefore threshold-crossing problem of nodal voltage and load flow are becoming increasingly more significant. Based on semi-invariant and Gram-Charlier series, the paper considers the randomness of the generator and load, nodes relevance, random slip of branches...
Traditional transmission planning often takes the minimum investment of network as objective function with power supply reliability as a constraint. However, this approach does not give consideration to both economy and reliability of the network. In this paper, the probabilistic method is performed to research on transmission expansion planning. Probabilistic Reliability Index (PRI) is modified,...
As an effective method of saving energy and avoiding market risks, generation rights trade has been carried out in some provinces and regional power companies. This paper analyzes the existing generation rights trade models and their algorithms, points that the results calculated by high-low match mode are not the optimal, because the trade order is inherent characteristic owned by this mode, which...
Due to the large amount of branches and high grounding resistance of the distribution network, the earth fault location has not been solved effectively. A live location method is proposed for the single-phase-to-earth fault section in the neutral point resonant grounded system. By this method, the compensation current of arc-suppression coil is adjusted after the metallic earth fault occurs. And the...
At present, the small analog signal transmission is adopted between process level and bay level in most of the digital substation systems below 35kV. Considering the characteristic of the structure and the special request for the earth fault line selection device, the design of line selection device is proposed for the digital substations. With distributed structure, the device consists of two parts,...
There are three different structures between process level and bay level in digital substations below 35kV nowadays; they are IEC61850-9-1 standard, IEC61850-9-2 standard and small analog signal transmission standard. Accounting for the features of three kinds of structures and special requirements of non-effectively grounded system fault line detection device, the design of line detection device...
The generation rights trade could make the losses change, which should be compensated by the trade participants, so the fair loss compensation principle should be established, it could not only help for confirming the traders' responsibilities, but also help the generation rights trade to develop very quickly. This paper thinks that the key of solution is how to allocate the incremental losses to...
In the electricity market, analyzing the distribution of complex source power in the network is the theoretical basis of confirming transmission service and wheeling service cost, etc. The analyzing method of based on the current and voltage can be seen as the question of how to allocate the nonlinear function value to its independent variables, but its solution is not unique. This paper, based on...
The targeted and current development of wind energy in various countries around the world reveals that wind power is the fastest growing power generation technology. Squirrel cage induction generator has been widely used in the wind power industry. However, with the increment in penetration of these turbines, power system will experience a change in dynamics and operational characteristics. Given...
The Steady current is different from pulse currents in frequency and magnitude. The interferences in the work environment of the currents transformer is greater than the lab. It is important to understand the Rogowski coil's character of measuring the 50 Hz currents and the measure error. This paper presents a model of Rogowski coil based on the control theory. Research based on the model about the...
In the security constrained dispatch, congestion management, etc, the computation of line flows is important work. It is not only necessary to meet the need of real-time, but also to guarantee the accuracy. This paper, basing on the observation of a lot of line flow data, deduces the linear relationship between generation and its active power components on transmission lines. In order to prove this...
The 50 Hz current is different from pulse currents in frequency and magnitude. The interferences in the work environment of the currents transformer is greater than the lab. It is important to understand the Rogowski coil's character of measuring the 50 Hz currents and the measure error. This paper presents a model of Rogowski coil based on the control theory. Research based on the model about the...
Based on morphological filter and correlation analysis, this paper presented a novel transient method for single-phase ground-fault line selection in resonant grounded network. Firstly an improved composite morphological filter with multiple-structure elements (SE) is designed to filtering the transient zero-sequence fault signals. Using it the meaningful information can be derived effectively from...
This paper introduces an intelligent decision support system based on multi-agent system, the intention of which is to upgrade intelligent level of power grid dispatching. The system utilizes the data from SCADA and fault information system. Based on the integrated data source, a model of agent living environment is presented. More researches are focused on architecture of multi-agent system and cooperative...
This paper put forward to an interactive flexible SCADA system in which information shared, on the basis of analyzing and summarizing the defections of former SCADA. It not only solves the interaction of data and function in the information islands, but also solves functions coordination and data exchange of distributed application system in different location. The paper proposes the concept of general...
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