Frequency control of wind penetrated hydro-dominated power system

Renuka, T. K.; Reji, P.

doi:10.1109/tapenergy.2015.7229638

Cited by 7 publications

(6 citation statements)

References 6 publications

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“…However, [40] and [53] also combine torque control at the same time as a pitch control for a DFIG. Renuka and Reji [54] proposed changing the input variables to wind speed (υ) and the error in the speed of rotation of the generator (eω) also for a DFIG motor. Finally Zeddini et al [55] used as input the voltage (V) and the error in voltage (eV) for an OSIG.…”

Section: ) Fuzzy Rulesmentioning

confidence: 99%

Expert Control Systems Implemented in a Pitch Control of Wind Turbine: A Review

et al. 2019

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Wind energy is the strongest renewable energy source developed in recent decades. Being systems that are directly connected to the grid of the electrical system, it is essential to use the maximum available power of the wind and obtain the maximum electrical power converted from the turbine. In this paper, the fundamental problem of the wind turbine is how to obtain at all times the maximum output power of the turbine in a wide range of wind speed. The randomness of the wind adds an intrinsic difficulty to be able to plan the available wind energy in advance. To solve this problem, it is not necessary to know the dynamic operation of the system; we must anticipate the control response to each one of the different probable scenarios. An expert control system can be used based on human knowledge and experience, which, through proper management of its variables and adequate control of criteria to manipulate stored data, provides a way to determine solutions. In other words, it is a model of the experience of professionals in this field. The more variables in the system are considered, the more complete the model will be, and the more information will be available for decision-making, with a more efficient system and higher results in power generation as a response. For this reason, the objective of this paper is to present expert systems developed in recent years and, thus, offer a control solution that approximates the conditions of different wind turbines.INDEX TERMS Artificial neural network, fuzzy logic, genetic algorithms, wind power generation, control systems.

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Section: ) Fuzzy Rulesmentioning

confidence: 99%

Expert Control Systems Implemented in a Pitch Control of Wind Turbine: A Review

et al. 2019

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“…However, it is possible to achieve short-term inertial responses from variable-speed wind turbines by modifying their control loops [28][29][30][31]. According to this idea, synthetic inertia of a VSWT is modeled in [32], highlighting the important improvement in the minimum frequency (NADIR). Different activation schemes for the synthetic inertia on VSWT based on full converters have been proposed in [33].…”

Section: Introductionmentioning

confidence: 99%

Frequency Regulation of a Hybrid Wind–Hydro Power Plant in an Isolated Power System

2018

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Currently, some small islands with high wind potential are trying to reduce the environmental and economic impact of fossil fuels by using renewable resources. Nevertheless, the characteristics of these renewable resources negatively affect the quality of the electrical energy, causing frequency disturbances, especially in isolated systems. In this study, the combined contribution to frequency regulation of variable speed wind turbines (VSWT) and a pump storage hydropower plant (PSHP) is analyzed. Different control strategies, using the kinetic energy stored in the VSWT, are studied: inertial, proportional, and their combination. In general, the gains of the VSWT controller for interconnected systems proposed in the literature are not adequate for isolated systems. Therefore, a methodology to adjust the controllers, based on exhaustive searches, is proposed for each of the control strategies. The control strategies and methodology have been applied to a hybrid wind-hydro power plant on El Hierro Island in the Canary archipelago. At present, in this isolated power system, frequency regulation is only provided by the PSHP and diesel generators. The improvements in the quality of frequency regulation, including the VSWT contribution, have been proven based on simulating different events related to wind speed, or variations in the power demand.

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“…However, it is possible to achieve short-term inertial responses from VSWTs by T modifying their control loops [21][22][23][24]. According to this idea, Renuka and Reji modelled a synthetic inertia of VSWTs in [25], underlining the important improvement in the minimum frequency peak (nadir). Prof. Gonzalez-Longat proposed different activation schemes for the synthetic inertia on VSWTs based on full converters in [26] and established practical limits for the gain of synthetic inertia control loop used in fullconverter VSWT generators in [27].…”

Section: Introductionmentioning

confidence: 99%

Eigen analysis of wind–hydro joint frequency regulation in an isolated power system

Martínez‐Lucas

Moreno

Sánchez-Fernández

2018

International Journal of Electrical Power & Energy Systems

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The wind energy penetration rate is being increased in majority of European countries. However, a high pe-netration rate could endanger the stability of power systems, particularly in small islands. Hydropower plays an important role in the regulation and control of isolated power systems with renewable sources, but it may not be able to maintain the frequency within grid requirements. This is the case of El Hierro power system (Canary archipelago), where a hybrid wind-pumped storage hydropower plant (PSHP) was committed to reduce the use of fossil fuels. Currently, frequency regulation is only provided by the PSHP and diesel generators. Therefore, it is proposed that variable-speed wind turbines (VSWTs) contribute to frequency regulation, thereby minimizing the need for fossil fuels. This study aims to conduct an analysis on the effect of the VSWT contribution to frequency regulation in the power system of El Hierro. It is based on classical control tools from a linearized mathematical model considering different VSWT regulation strategies. The eigenvalues, damping ratio, and participation factors of the state variables have been obtained. The more significant oscillation modes in the dynamic response of the system have been identified. According to this modal analysis, a methodology for the adjustment of the PSHP and VSWT controller gains is proposed. An improvement in the quality of frequency regulation while maintaining the El Hierro system frequency within grid requirements has been proved based on simulating different events related to wind speed or variations in the power demand, using a nonlinear model of the combined wind-hydro power plant.

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Frequency control of wind penetrated hydro-dominated power system

Cited by 7 publications

References 6 publications

Expert Control Systems Implemented in a Pitch Control of Wind Turbine: A Review

Expert Control Systems Implemented in a Pitch Control of Wind Turbine: A Review

Frequency Regulation of a Hybrid Wind–Hydro Power Plant in an Isolated Power System

Eigen analysis of wind–hydro joint frequency regulation in an isolated power system

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