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A method for formulating system frequency response (SFR) model-derived frequency indexes into optimum framework of sizing energy storage systems (ESSs) that participate in frequency control in power systems is presented. A novel simplified SFR model, approximating frequency and governor responses with quadratic and linear functions respectively, is first developed, leading to a fast and accurate computation...
In this paper, a non-integer (fractional) order controller namely tilt integral derivative controller has been introduced as supplementary controller in automatic generation control (AGC) of a two-area power system. Generally, classical control approach such as PI control and PID control has been most widely used in AGC scheme, but due to increase in complexity of the power system, the performance...
Isolated grid (IG) usually has small inertia constant, and the primary frequency regulation ability of IG is limited. In addition, high penetration level of photovoltaic power plants (PV-PPS)integrated to IG deteriorate system inertial and primary frequency regulation ability. To ensure the stability of frequency, UC model considering dynamic frequency limit (DFL) is proposed in this paper, and PV-PPS...
This paper presents application of tilt integral derivative (TID) controller as a load frequency control scheme for improving the frequency response of two-area power system. TID control is a type of fractional order control, having similar structure to PID control but instead of a proportional behavior (like in PID); TID has a tilted behavior which can be recognized by the transfer function of TID...
The increasing photovoltaic generation (PV) in a small and isolated power system often has a negative impact on the primary frequency response. A previous work has shown, by means of a statistical analysis, that the risk of Under Frequency Load Shedding (UFLS), following a unit outage, increases as the PV installed capacity rises. In this work, a similar approach is used to quantify the potential...
The Quantitative Feedback Theory idea is an interesting concept in the scope of robust controller design and represents an alternative way to the μ-synthesis. Particularly, it allows to obtain controllers less conservative than other control design methods like those based on H∞ optimisation. Nevertheless the design of automatic loop shaping algorithms is a complex question and remains an open topic...
Micro-grids (MGs) are active networks known as an effective solution for the control of grids including high levels of Distributed Generation (DG). In off-grid MGs, DGs connected to Voltage Source Inverters (VSIs) enroll as controllers of voltage and frequency. These VSIs should share power between the DGs fairly. A precise power sharing may increase frequency drop. In this paper, a trade-off is obtained...
This paper presents a user-friendly loop-shaping method employing the Robust Bode (RBode) plot for optimizating the head-positioning system in a hard disk drive. The RBode plot represents the robust performance criterion as allowable and forbidden regions on the open-loop Bode plot. Using the RBode plot, control engineers can easily design controllers that suppress disturbances and account for perturbations...
An approach is proposed which improves the quality and speed of manual loop shaping. Loop shaping is an iterative and creative controller design procedure where the control engineer uses frequency response function (FRF) data of the plant to shape the open loop response such that it satisfies stability, performance and robustness specifications. The advantage compared to automated controller design...
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