scholarly journals A Model-Based Design Approach for Stability Assessment, Control Tuning and Verification in Off-Grid Hybrid Power Plants

Energies ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 49 ◽  
Author(s):  
Lennart Petersen ◽  
Florin Iov ◽  
German Tarnowski
Keyword(s):  
Power Plants ◽  
Frequency Regulation ◽  
Small Signal Stability ◽  
Signal Stability ◽  
Hybrid Power ◽  
Model Based ◽  
Wide Range ◽  
Rapid Control Prototyping ◽  
And Control ◽  
The Impact

This paper proposes detailed and practical guidance on applying model-based design (MBD) for voltage and frequency stability assessments, control tuning and verification of off-grid hybrid power plants (HPPs) comprising both grid-forming and grid-feeding inverter units and synchronous generation. First, the requirement specifications are defined by means of system, functional and model requirements. Secondly, a modular approach for state-space modelling of the distributed energy resources (DERs) is presented. Flexible merging of subsystems by properly defining input and output vectors is highlighted to describe the dynamics of the HPP during various operating states. Eigenvalue (EV) and participation factor (PF) analyses demonstrate the necessity of assessing small-signal stability over a wide range of operational scenarios. A sensitivity analysis shows the impact of relevant system parameters on critical EVs and enables one to finally design and tune the central HPP controller (HPPC). The rapid control prototyping and control verification stages are accomplished by means of discrete-time domain models being used in both off-line simulation studies and real-time hardware-in-the-loop (RT-HIL) testing. The outcome of this paper is targeted at off-grid HPP operators seeking to achieve a proof-of-concept on stable voltage and frequency regulation. Nonetheless, the overall methodology is applicable to on-grid HPPs, too.

scholarly journals Fast Dynamic Simulation-Based Small Signal Stability Assessment and Control

2014 ◽  
Author(s):  
Naresh Acharya ◽  
Chaitanya Baone ◽  
Santosh Veda ◽  
Jing Dai ◽  
Nilanjan Chaudhuri ◽  
...  
Keyword(s):  
Dynamic Simulation ◽  
Small Signal ◽  
Stability Assessment ◽  
Small Signal Stability ◽  
Signal Stability ◽  
Simulation Based ◽  
And Control ◽  
Fast Dynamic

scholarly journals A Novel Control Architecture for Hybrid Power Plants to Provide Coordinated Frequency Reserves

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 919 ◽  
Author(s):  
Daniel Vázquez Pombo ◽  
Florin Iov ◽  
Daniel-Ioan Stroe
Keyword(s):  
Power Plants ◽  
Wind Farm ◽  
Frequency Control ◽  
Storage System ◽  
Hybrid Plant ◽  
Power Grids ◽  
Control Architecture ◽  
Frequency Regulation ◽  
Hybrid Power ◽  
Two Stages

The inertia reduction suffered by worldwide power grids, along with the upcoming necessity of providing frequency regulation with renewable sources, motivates the present work. This paper focuses on developing a control architecture aimed to perform frequency regulation with renewable hybrid power plants comprised of a wind farm, solar photovoltaic, and a battery storage system. The proposed control architecture considers the latest regulations and recommendations published by ENTSO-E when implementing the first two stages of frequency control, namely the fast frequency response and the frequency containment reserve. Additionally, special attention is paid to the coordination among sub-plants inside the hybrid plant and also between different plants in the grid. The system’s performance is tested after the sudden disconnection of a large generation unit (N-1 contingency rules). Thus, the outcome of this study is a control strategy that enables a hybrid power plant to provide frequency support in a system with reduced inertia, a large share of renewable energy, and power electronics-interfaced generation. Finally, it is worth mentioning that the model has been developed in discrete time, using relevant sampling times according to industrial practice.

scholarly journals Small-signal stability and fault performance of mixed grid forming and grid following offshore wind power plants connected to a HVDC-diode rectifier

2020 ◽  
Vol 14 (12) ◽  
pp. 2166-2175
Author(s):  
Jaime Martínez-Turégano ◽  
Salvador Añó-Villalba ◽  
Soledad Bernal-Perez ◽  
Ruben Peña ◽  
Ramon Blasco-Gimenez
Keyword(s):  
Wind Power ◽  
Power Plants ◽  
Offshore Wind ◽  
Small Signal ◽  
Small Signal Stability ◽  
Offshore Wind Power ◽  
Signal Stability ◽  
Wind Power Plants

scholarly journals Assessing the Impact of DFIG Synthetic Inertia Provision on Power System Small-Signal Stability

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3440 ◽  
Author(s):  
Edgar Lucas ◽  
David Campos-Gaona ◽  
Olimpo Anaya-Lara
Keyword(s):  
Power System ◽  
Large Scale ◽  
Damping Ratio ◽  
System Stability ◽  
Electrical Network ◽  
Small Signal ◽  
Small Signal Stability ◽  
Signal Stability ◽  
Electromechanical Modes ◽  
The Impact

Synthetic inertia provision through the control of doubly-fed induction generator (DFIG) wind turbines is an effective means of providing frequency support to the wider electrical network. There are numerous control topologies to achieve this, many of which work by making modifications to the DFIG power controller and introducing additional loops to relate active power to electrical frequency. How these many controller designs compare to one-another in terms of their contribution to frequency response is a much studied topic, but perhaps less studied is their effect on the small-signal stability of the system. The concept of small-signal stability in the context of a power system is the ability to maintain synchronism when subjected to small disturbances, such as those associated with a change in load or a loss of generation. Amendments made to the control system of a large-scale wind farm will inevitably have an effect on the system as a whole, and by making a DFIG wind turbine behave more like a synchronous generator, which synthetic inertia provision does, may incur consequences relating to electromechanical oscillations between generating units. This work compares the implications of two prominent synthetic inertia controllers of varying complexity and their effect on small-signal stability. Eigenvalue analysis is conducted to highlight the key information relating to electromechanical modes between generators for the two control strategies, with a focus on how these affect the damping ratios. It is shown that as the synthetic inertia controller becomes both more complex and more effective, the damping ratio of the electromechanical modes is reduced, signifying a decreased system stability.

Impact of Large-Scale Integrated Wind Farms on the Small Signal Stability of Power System

2013 ◽  
Vol 805-806 ◽  
pp. 393-396
Author(s):  
Zhen Yu Xu ◽  
Zhen Qiao ◽  
Qian He ◽  
Xu Zhang ◽  
Jing Qi Su
Keyword(s):  
Power System ◽  
Large Scale ◽  
Power Grid ◽  
Wind Farms ◽  
Small Signal ◽  
Small Signal Stability ◽  
Direct Drive ◽  
Signal Model ◽  
Signal Stability ◽  
The Impact

With the penetration of wind energy is becoming higher and higher in power grid, it is very important to investigate the impact of wind generations on small signal stability. In this paper, a complete small signal model of wind turbine with direct-drive permanent magnet generator is built to study the impact of large-scale wind farms on the small signal stability of power system. By means of simulation and eigenvalue analysis, an actual power system is investigated, and the damping characteristic of power grid under different wind power penetration is discussed.

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