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Chaotic oscillation is a harmful phenomenon for power system and it threatens the safe and stable operation of power system. This paper presents fractional order fixed-time nonsingular terminal sliding mode control to suppress chaos in power system. A novel fractional order terminal sliding mode surface is first proposed to guarantee the fixed-time convergence of system states along the sliding surface,...
The characterization of the closed-loop delays in a wide-area control system (WACS) is an important foundation for further research. The method to estimate and measure the closed-loop delay in actual WACSs were proposed in this paper. Then, the closed-loop delays in the actual WACS in Guizhou Power Grid in China were measured and analyzed. Also, the measured delays were used to verify the normal distribution...
Cross-regional interconnection of power systems, large-scale integration of renewable energy and interaction between demand side and power systems are raising new challenges to the operation of a large scale power system, such as complexity, uncertainty. A risk quantitative assessment method of emergency control measures is proposed to improve power grid transmission capacity based on the study of...
Wide-area power system stabilizer (WPSS) is one of the most potentially effective approaches to damp interarea low frequency oscillations in power systems. When WPSS is implemented in a real project, emphasis should be put on feedback signal delay problem. In order to intensively study the delay of phasor measurement unit data, field tests have been carried out in Guizhou power grid (GZPG), and results...
Distributed Generation may be located far away from load centers due to their use of new energy resource distribution characteristics. In this case, Long distance transmission lines will introduce an equivalent impedance to the grid, so that the grid showing the characteristics of a weak grid. In this paper, the interaction between LCL-type grid-connected inverter and weak grid is studied by means...
In presence of large disturbances, observation of separation mechanism based on wide-area measurements and emergency controls are important and problematic tasks to restore system stability. This paper proposed a novel approach to properly locate the controllers and observers based on modal analysis. For structure preserving models, rank tests are proposed to qualify the placement to ensure the unstable...
Power system low frequency oscillations are detrimental to the stability and security of interconnected power networks. The recent advance in the wide area measurement system (WAMS) is driving power community to accept the notion of wide area monitoring and control. This paper proposes the placement of wide area PSSs and the selection of stabilizing signals based on improved residue matrices. Modal...
This paper proposes a new method of controller design for damping inter-area oscillations in power system. The concepts of the mode controllability index and mode observability index are introduced into the modal analysis at the operating point in damping controller design. The controller is located according to mode controllability index, and the input signals of controller are selected according...
The issue of pricing the services provided by power system stabilizers (PSS) to damp out low-frequency oscillations in large interconnected electrical power grids is proposed. Taking the dominant eigenvalue method for analytical tool to evaluate the increased transfer capability when PSS-control services are utilized, a method based on nucleolus in the cooperative game theory to determine the individual...
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