scholarly journals Using MPC to Balance Intermittent Wind and Solar Power with Hydro Power in Microgrids

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 874
Author(s):  
Madhusudhan Pandey ◽  
Dietmar Winkler ◽  
Roshan Sharma ◽  
Bernt Lie
Keyword(s):  
Predictive Control ◽  
Power Plants ◽  
Parameter Sensitivity Analysis ◽  
Improve Performance ◽  
Hydro Power ◽  
Hydro Turbine ◽  
Wind Power Plants ◽  
Power Injection ◽  
Future Prediction ◽  
Valve Position

In a microgrid connected with both intermittent and dispatchable sources, intermittency caused by sources such as solar and wind power plants can be balanced by dispatching hydro power into the grid. Both intermittent generation and consumption are stochastic in nature, not known perfectly, and require future prediction. The stochastic generation and consumption will cause the grid frequency to drift away from a required range. To improve performance, operation should be optimized over some horizon, with the added problem that intermittent power varies randomly into the future. Optimal management of dynamic system over a future horizon with disturbances is often posed as a Model Predictive Control (MPC) problem. In this paper, we have employed an MPC scheme for generating a hydro-turbine valve signal for dispatching necessary hydro power to the intermittent grid and maintaining grid frequency. Parameter sensitivity analysis shows that grid frequency is mostly sensitive to the turbine valve signal. We have found that controller discretization time, grid frequency, and power injection into the grid are interrelated, and play an important role in maintaining the grid frequency within the thresholds. Results also indicate that the fluctuations in grid frequency are insignificant on the turbine valve position during power injection into the grid.

scholarly journals Dynamic Model for Hydro-Turbine Generator Units Based on a Database Method for Guide Bearings

2013 ◽  
Vol 20 (3) ◽  
pp. 411-421 ◽  
Author(s):  
Yong Xu ◽  
Zhaohui Li ◽  
Xide Lai
Keyword(s):  
Dynamic Model ◽  
Power Plants ◽  
Operating Conditions ◽  
Radial Vibration ◽  
Turbine Generator ◽  
Hydro Power ◽  
Rotating Speed ◽  
Hydro Turbine ◽  
Machine Health Monitoring ◽  
Fault Mechanism

A suitable dynamic model of rotor system is of great significance not only for supplying knowledge of the fault mechanism, but also for assisting in machine health monitoring research. Many techniques have been developed for properly modeling the radial vibration of large hydro-turbine generator units. However, an applicable dynamic model has not yet been reported in literature due to the complexity of the boundary conditions and exciting forces. In this paper, a finite element (FE) rotor dynamic model of radial vibration taking account of operating conditions is proposed. A brief and practical database method is employed to model the guide bearing. Taking advantage of the method, rotating speed and bearing clearance can be considered in the model. A novel algorithm, which can take account of both transient and steady-state analysis, is proposed to solve the model. Dynamic response for rotor model of 125 MW hydro-turbine generator units in Gezhouba Power Station is simulated. Field data from Optimal Maintenance Information System for Hydro power plants (HOMIS) are analyzed compared with the simulation. Results illustrate the application value of the model in providing knowledge of the fault mechanism and in failure diagnosis.

scholarly journals EFFECTS OF WIND FARM OPERATING REGIMES IN THE POWER SYSTEM OF MACEDONIA

2017 ◽  
Vol 32 (1-2) ◽  
Author(s):  
Anton Čauševski ◽  
Tome Boševski
Keyword(s):  
Renewable Energy ◽  
Power System ◽  
Wind Power ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Thermal Power ◽  
Operating Mode ◽  
Hydro Power ◽  
Wind Power Plants ◽  
Hydro Power Plants

A b s t r a c t: The trend for achieving sustainable energy development, keeping the environment clean and utilization of renewable energy sources are imperative to the energy development in several countries. Through legislation and economical benefits, countries tend to encourage potential investors for building the technologies for energy production from renewable. In order to achieve the EU energy target to have 20% renewable in 2020, the technologies for producing electricity from renewable energy sources (RES) are used to cover the needs with more intensities. The most dominant renewable is the wind power plants(WPP) or wind parks, which are used to supply electricity to more power systems (EPS) and whose installed capacity in some European countries reaches thousands MW. This paper treats the issue of operational work of wind power in the power system of Macedonia. It is made of simulation work with wind power plants with total installed capacity of 150 MW with an annual production of 300 GWh. The considered power system of Macedonia is projected for the period of 2015 with an annual consumption of 10,000 GWh. The power plants considering operating in the simulated period are the existing thermal power units and hydro power plants together with the planned gas power plants and hydro power plants. The aim of this paper is to analyze the effects of the power system operation in case to have installed wind power plants, or what operation mode of thermal power plants (TPP) and hydro power plants (HPP) is most convenient when the system has a source of technology from the renewable with stochastically nature. This is especially important, because conventional power plants (TPP and HPP) operate and regulate the needs of consumption in the power system, but the wind power plants operate when the wind occurs within certain limits of  technical operating mode for wind turbines. Although wind is free renewable energy source, frequency of occurrence of wind with unpredictable nature and stochastically, has additional adverse impact in terms of power system operating mode. Certainly the impact of wind power on the overall the power system operation depends on power plants and configuration of the power system. In other words, the base load is covered from TPP fossil fuel or nuclear plants, and the dynamic nature of wind power can be incorporated in the power system depends on how much power plants for peak load are available in the system (storage reversible hydro or gas turbines), or how variable power can be accepted in the power system.

scholarly journals Optimal location and reactive power injection of wind farms and SVC’s units using voltage indices and PSO

2019 ◽  
Vol 9 (5) ◽  
pp. 3407
Author(s):  
Nazha Cherkaoui ◽  
Abdelaziz Belfqih ◽  
Faissal El Mariami ◽  
Jamal Boukherouaa ◽  
Abdelmajid Berdai
Keyword(s):  
Wind Power ◽  
Power Plants ◽  
Wind Farm ◽  
Reactive Power ◽  
Wind Farms ◽  
Voltage Regulation ◽  
Optimal Location ◽  
Wind Power Plants ◽  
Power Injection ◽  
Power Capability

<p class="Default">Nowadays, the use of the wind energy has known an important increase because it is clean and cheap. However, many technical issues could occur due to the integration of wind power plants into power grids. As a result, many countries have published grid code requirements that new installed wind turbines have to satisfy in order to facilitate its intergration to electrical networks. Among those requirements, the wind farms must be able to participate to ancillary services for instance voltage regulation and reactive power control. Nevertheless, in case of small wind farms having not the necessary reactive power capability to contribute to reactive power support, Flexible AC Transmission Systems (FACTS) devices could also be used to participate to reactive power support. In this paper, an optimization method based on particle swarm optimization (PSO) technique is presented. This method allows getting the optimal location and reactive power injection of both wind power plants (WPP) and synchronous var compensators (SVC) with the objective to improve the voltage profile and to minimize the active power losses. The IEEE 14 bus system and a 20 MW wind farm based doubly fed induction generator (DFIG) are used to validate the proposed algorithm. The simulation results are analysed and compared.</p>

The territory of the Russian Federation is a rescue from the COVID-19 coronavirus

2020 ◽  
pp. 26-29
Author(s):  
Yu. Kozlov ◽  
R. Serebryakov
Keyword(s):  
Wind Power ◽  
Rural Areas ◽  
Small Area ◽  
Power Plants ◽  
Air Spring ◽  
Atmospheric Air ◽  
Large Cities ◽  
Wind Power Plants ◽  
The World ◽  
The Russian Federation

A new coronavirus pandemic is raging all over the world, especially in densely populated areas. Unlike most countries, more than half of the territory of Russia is not used by humans — which means that it is possible to settle large cities to avoid crowding people on a small area. The authors of the article consider wind power, namely vortex wind power plants, as a new source of energy that can be quickly and with less harm built in rural areas. The article also discusses the possibilities of an alternative Autonomous non-volatile installation "Air spring" for obtaining fresh water from atmospheric air.

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