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

Martínez‐Lucas, Guillermo; Moreno, José Ignacio; Sánchez-Fernández, José Ángel

doi:10.1016/j.ijepes.2018.06.028

Cited by 31 publications

(23 citation statements)

References 63 publications

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“…where K f is the Kalman filter gain. In this way, based on the estimationsd and x l , the MPC with disturbance compensation is designed, which consists of the model of Equation (17) and the system of Equation 18, withd provided by the Kalman filter. Moreover, the MPC has the objective function of Equation (19): (19) in which x l and x r are the states of the filtered and the reference models, respectively.…”

Section: Model Predictive Control With Disturbance Decouplingmentioning

confidence: 99%

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Data-Driven Control Techniques for Renewable Energy Conversion Systems: Wind Turbine and Hydroelectric Plants

2019

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The interest in the use of renewable energy resources is increasing, especially towards wind and hydro powers, which should be efficiently converted into electric energy via suitable technology tools. To this end, data-driven control techniques represent viable strategies that can be employed for this purpose, due to the features of these nonlinear dynamic processes of working over a wide range of operating conditions, driven by stochastic inputs, excitations and disturbances. Therefore, the paper aims at providing some guidelines on the design and the application of different data-driven control strategies to a wind turbine benchmark and a hydroelectric simulator. They rely on self-tuning PID, fuzzy logic, adaptive and model predictive control methodologies. Some of the considered methods, such as fuzzy and adaptive controllers, were successfully verified on wind turbine systems, and similar advantages may thus derive from their appropriate implementation and application to hydroelectric plants. These issues represent the key features of the work, which provides some details of the implementation of the proposed control strategies to these energy conversion systems. The simulations will highlight that the fuzzy regulators are able to provide good tracking capabilities, which are outperformed by adaptive and model predictive control schemes. The working conditions of the considered processes will be also taken into account in order to highlight the reliability and robustness characteristics of the developed control strategies, especially interesting for remote and relatively inaccessible location of many plants.

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Section: Model Predictive Control With Disturbance Decouplingmentioning

confidence: 99%

“…On the other hand, an advanced control logic combining four control schemes that rely on adaptive, fuzzy and neural network regulators was investigated in [13]. Finally, regarding joint wind-hydro deployments, some more recent works analysed the problem of frequency control of isolated systems [16,17].…”

Section: Introductionmentioning

confidence: 99%

Data-Driven Control Techniques for Renewable Energy Conversion Systems: Wind Turbine and Hydroelectric Plants

2019

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“…Frequency disturbances will initially be mitigated by means of a frequency controller that modifies the power consumed by the pumps. Frequency deviations are corrected through an adjustment of the power reference tracked by the converter (see Figure 6) according to the PI control, Equation 14: (14) Power converters, according to the modification in power reference, change electric power demanded by VSPs, thus reducing frequency deviation. Consequently, according to Equation 11, rotor speed, n p , and mechanical power from the hydraulic machines, p p , will adapt to the new electrical power.…”

Section: Variable-speed Pump Controlmentioning

confidence: 99%

“…For this reason, specific grid codes for island power systems have been developed [10]. In these systems, there are several contributions that enhance turbine mode operation of PSHPs [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Dual Frequency Regulation in Pumping Mode in a Wind–Hydro Isolated System

et al. 2018

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Frequency control is one of the most critical tasks in isolated power systems, especially in high renewable penetration scenarios. This paper presents a new hydropower pumped-storage dual control strategy that combines variable-speed-driven pumps and fixed-speed-driven pumps. A possible case for implementation of such a control scheme is described based on El Hierro Island’s power system. This isolated power system consists of a hybrid wind pumped-storage hydropower plant and diesel generators. The pumped-storage power plant is divided into a hydropower plant equipped with four Pelton turbines and a pump station equipped with both fixed- and variable-speed pumps. According to the proposed control scheme, frequency regulation will be provided by a dual controller: a continuous controller for the variable-speed pumps and a discrete controller for the fixed-speed pumps. The Pelton units, which operate as synchronous condensers, also supply the power system inertia. Therefore, diesel units may be disconnected, decreasing generation costs and greenhouse gas emissions. Owing to the combination of both controllers and the inertia of the Pelton units, an acceptable frequency regulation can be achieved. This technique has been validated through computer simulations.

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“…There are many different forms for storing the wind energy: gravitational potential energy, compressed air, electrochemical energy, chemical energy, and kinetic energy [13]. Martinez-Lucas et al improved the quality of frequency regulation in isolated power systems by combining a hybrid wind-pumped storage hydropower plant (PSHP) with variable speed wind turbines (VSWT) [14,15]. Battery energy storage systems are regarded as one of the most promising technologies, which can help to overcome the issue mentioned above [16,17].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Control of a 600 kW Closed Hydraulic Wind Turbine with an Energy Storage System

et al. 2018

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In this paper, an innovative closed hydraulic wind turbine with an energy storage system is proposed. The hydraulic wind turbine consists of the wind rotor, the variable pump, the hydraulic bladder accumulator, the variable motor, and the synchronous generator. The wind energy captured by the wind rotor is converted into hydraulic energy by the variable pump, and then the hydraulic energy is transformed into electrical energy by the variable motor and generator. In order to overcome the fluctuation and intermittence shortcomings of wind power, the hydraulic bladder accumulator is used as an energy storage system in this system to store and release hydraulic energy. A double-loop speed control scheme is presented to allow the wind rotor to operate at optimal aerodynamic performance for different wind speeds and hold the motor speed at the synchronous speed to product constant frequency electrical power regardless of the changes of wind speed and load power. The parameter design and modeling of 600 kW hydraulic wind turbine are accomplished according to the Micon 600 kW wind turbine. Ultimately, time-domain simulations are completed to analyze the dynamic response of the hydraulic wind turbine under the step change conditions of wind speed, rotor speed input, and load power. The simulation results validate the efficiency of the hydraulic wind turbine and speed control scheme presented, moreover, they also show that the systems can achieve the automatic matching among turbine energy, accumulator energy, and generator output energy.

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

Cited by 31 publications

References 63 publications

Data-Driven Control Techniques for Renewable Energy Conversion Systems: Wind Turbine and Hydroelectric Plants

Data-Driven Control Techniques for Renewable Energy Conversion Systems: Wind Turbine and Hydroelectric Plants

Dual Frequency Regulation in Pumping Mode in a Wind–Hydro Isolated System

Modeling and Control of a 600 kW Closed Hydraulic Wind Turbine with an Energy Storage System

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