José I. Sarasúa's research while affiliated with Universidad Politécnica de Madrid and other places

Publications (9)

Article
Increased renewable energy penetration in isolated power systems has a clear impact on the quality of system frequency. The flywheel energy storage system (FESS) is a mature technology with a fast frequency response, high power density, high round-trip efficiency, low maintenance, no depth of discharge effects, and resilience to withstand continuou...
Article
Full-text available
Over the last two decades, variable renewable energy technologies (i.e., variable-speed wind turbines (VSWTs) and photovoltaic (PV) power plants) have gradually replaced conventional generation units. However, these renewable generators are connected to the grid through power converters decoupled from the grid and do not provide any rotational iner...
Article
The upgrade of a pumped-storage power plant (PSPP) to allow variable speed operation offer several advantages in pumping and generating modes. However, in pumping mode at part load, both pressure and torque pulsations develop in the pump turbine runner. This paper evaluates the risk of fatigue damage in the penstock of a variable-speed PSPP due to...
Article
Full-text available
This paper presents a dynamic simulation model of a laboratory-scale pumped-storage power plant (PSPP) operating in pumping mode with variable speed. The model considers the dynamic behavior of the conduits by means of an elastic water column approach, and synthetically generates both pressure and torque pulsations that reproduce the operation of t...
Article
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The objective of this paper is to investigate the cause of several unexpected high amplitude oscillations that occurred in the surge tank water level of a real hydropower plant during secondary load-frequency control (LFC) maneuvers, after the replacement of the turbine runner, and to propose solutions that allow the power plant to continue providi...
Conference Paper
The run-of-river hydro power plant usually have low or nil water storage capacity, and therefore an adequate control strategy is required to keep the water level constant in pond. This paper presents a novel technique based on TSK fuzzy controller to maintain the pond head constant. The performance is investigated over a wide range of hill curve of...
Article
Full-text available
This paper presents a control system for low-head diversion run-of-river small hydro plants with pressure conduits. Since these hydropower plants usually have low or null water storage capacity, the water discharged through the turbines should be adapted to the possible extent to the natural river inflow. For this purpose, a control scheme aimed at...
Conference Paper
Nowadays, new small hydro power plants are being built all over the world. In most cases, these power plants lack significant storage capacity; therefore the more adequate control strategy is to keep constant the water level at the intake basin to capture the maximum amount of energy from the river flow. In this paper, the control of a diversion ru...

Citations

... In this way, VSTWs' rotational speed error and FESS' SOC are the two new inputs, which are corrected by the constant gains K p, ,hyd and K p,soc,hyd , respectively, and added to the PI conventional control, see Figure 4. Similar strategies were previously proposed in [65], where a cooperation between hydro-power plants and FESSs was analysed. In addition, the authors suggested an alternative frequency strategy for PV power plants in [66], where the frequency controller included the VSWTs' rotational speed deviation as an input; and a coordination between hydro-power and VSWTs in [67]. The proposed hybrid frequency control scheme reduces significantly the grid frequency excursions, simultaneously improving the PD inertial control effectiveness of both VSWTs and FESS. ...
... Obando et al. [12] proposed to use extreme values through Monte-Carlo simulations to quantify operating reserves. Note that, besides the widely known random factors of unit faults and generation/demand fluctuation, specific factors may also influence the operating reserve capacity of a power plant considerably [13]. It can also be noted that the random factors taken into account spinning reserve planning are diversifying over recent decades, not only because of the presence of the foregoing renewables but also the responsive demand [14,15] and energy storage [16] as well as electric vehicles [17]. ...
... The BSL-EARSM turbulence model at load step (Q/Q BEP = 0.27) has been applied. Reference [26] investigated the deep part-load range of a model pump-turbine in pumping mode. Reference [27] investigated this range in turbine mode. ...
... Basically, the design and implementation of LFM first started with single-area conventional systems at the turn of the last century with its linearized model of thermal/hydro/gas plants. The CFD of single-area conventional power network can be stated as [13]; Subjected to LFM, several articles have investigated this scheme in single-area power networks [16][17][18][19][20][21][22][23][24]. In [16] authors have integrated thermal power generated system for LFM schemes. ...
... RoR HP scheme is stated to be suitable for a river that has minimum flow variation or a river that is regulated by a large natural reservoir (e.g., a lake) [40]. The RoR HP projects are not associated with a lot of construction activities, and because of this, RoR HP projects possess economic as well as environmental advantages over other hydroelectricity generating systems of the same installed capacity [41, 42]. RoR hydropower generation technology is used in many countries of the world. ...
... The selected realistic scenarios include various generation mixes that have taken place in El Hierro power system, such as hydraulic short circuit, among others [69]. It is well known that hydraulic short circuit is necessary to give stability to the grid frequency in cases in which wind penetration is very high, even though it is not an operation mode appropriate from the point of view of the water balance [70]. By considering that this work aims to analyse the power system under conditions of 100% renewable generation, generation mix scenarios in which there are diesel units under operation have been omitted. ...
... The duct connecting ponds 1 and 0 have a cross-sectional area, . The controllable valve is between ponds 1 and 0. The constants are ȵ, the dimensionless water flow constant of value 0.98 [16], and , the gravitational constant of 9. 8 . In Equation (1), ( ) is defined as ...
... It is customary to task the flow control equipment with keeping the water level of the US tank at a constant value (Jimenez and Chaudhry 1992;Glattfelder and Huser 1993;Endo et al. 2000;Sarasua et al. 2007). This approach for flow regulation in hydraulic infrastructures is widely used, for example, in small hydroelectric plants (IEEE 1988;Choulot et al. 2012). ...