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The voltage and reactive power (VAR) management in the power system operation has becoming more challenging than ever. This is mainly due to long distance of power generations to the load centers and mesh interconnection of power grids. Coordinated Voltage Control (CVC) is found to be the most effective solutions for voltage and VAR control. This can be achieved by coordinating reactive power resources...
In China, wind power industry has undergone great development in the last few years, while several cascading faults happened in 2011, reveal that terminal voltage of wind turbine generator (WTG) should be monitored and controlled. Furthermore WTGs and static var compensators/generators (SVC/SVGs) need to be coordinated to provide voltage service for the whole network. In this paper, a network model...
Nowadays, the development of electric vehicles (EVs) is encouraged in China to address the issues about the energy security and the environment. In this study, the impacts of some crucial factors on the total charging load are investigated, such as the charging rate of the charging infrastructures, the battery capacity, the preference of the charging behavior and the penetration level of the charging...
With the rapid development of power system and the continuous expansion of the scale of power grids, problems such as heavy maintenance workload, repetitive modeling and low redundancy and accuracy of basic data are emerging in the traditional method of centralized modeling in control center. In this paper, a two-level distributed modeling system is presented to solve these problems, which moves parts...
This paper implements recursive least square method with variable forgetting factors (VFFRLS) in local real-time voltage stability monitoring scheme based on the application of Thevenin equivalent model and PMU to reform the existing methods which present weak performance in tracking the time-varying parameters of equivalent model for power system. The selections of variable forgetting factor and...
Visualization technique is widely used in power system real-time monitoring and decision making. But existing visualization tools lack the ability of data aggregation and the flexibility for user customization. The Operation Cockpit, originated from Management Cockpit, is proposed as a new solution for power system visualization. The basic concepts about Operation Cockpit are introduced. A preliminary...
Nowadays, environmental-friendly electric vehicles (EVs) attract great attention around the world. However, the adoption of EVs will impact the power system greatly. Different from previous work which concentrated on “when to charge”, research on “where to charge” to minimize the impacts on power grid is presented based on the interaction with Intelligent Transportation System (ITS). With the transportation...
PJM has developed a pilot program of on-line (real time) voltage control in which a system wide Optimal Voltage Control (OVC) demonstration system has been implemented and run on-line parallel with PJM existing system at PJM control center since Jan. 2010. The pilot program was for nine months. The OVC system consists of Data I/O Management, Control Strategy Calculation, Operation Log Management and...
The network reconfiguration optimal control in distribution networks is modeled as a multi-objective combinational optimization. Multiple objectives are considered for load balancing among the feeders, minimum deviation of the nodes voltage, minimize the power loss and branch current constraint violation. Based on the objectives evaluated by membership functions respectively. These objectives are...
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