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Phase-locked technique is necessary for grid-connected converters to exchange power with grid. This paper presented a digital phase-locked loop (DPLL) algorithm based on phase adjusting at positive zero-crossing of every cycle. And then, an islanding detection method was proposed based on the DPLL into which a phase deviation was induced via modifying the phase-locked error. The results of simulations...
A wide-area damping control system (WADC) has recently been developed by China southern power grid (CSG), to enhance the damping performance of inter-area oscillations in CSG. It's the first time that PMU measurements are used as input to a continuous feedback control system in a real bulk power grid. The WADC uses modulation of two HVDC systems for power system damping. The control system comprises...
This paper is a description of the successful implementation of a model-merge approach for creating and updating the power system model of the new energy management system (EMS) for the China Southern Grid Company (CSG). The power-system model of this new EMS is a merged model of the five models in the five EMS's serving the five province power systems that constitute the China Southern Grid. The...
Energy management systems (EMSs) suffer from poor external modeling during wide area event occurring in interconnected power systems. In order to improve this situation, an IEC61970 standard based hierarchical network remodeling system for electrical power control centers is designed in China. In this designed system, through a wide-area communication network, each underlying control center automatically...
This paper describes part of our recent works on a project of China Southern Power Grid (CSG), which involves the simultaneous coordinated tuning of the three HVDC modulation controllers, with wide-area signals, in 2008's CSG to damp interarea oscillations. Due to the modeling limitation of HVDC control loops in small signal stability analysis, previous works on similar projects of CSG strongly depended...
This paper make a brief introduction to overload capability of HVDC, and show the necessity and feasibility of using overload capability of HVDC in China Southern Power Grid. Overload capability of Tian-Guang HVDC and Gui-Guang HVDC transmission systems and its practical use in China Southern Power Grid are analyzed. Some problems in the practical use are pointed out and solutions to these problems...
This paper describes part of our recent works on a project of China Southern power grid (CSG), which involves analysis and design of wide-area coordinated HVDC modulation controllers to damp out interarea oscillations for CSG in 2008. The paper will put the emphasis on analysis issues. Due to the limitation of modeling of HVDC control loops in small signal stability analysis, previous works on similar...
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