Damping low frequency oscillations with hydro governors

Weixelbraun, Michael; Renner, Herwig; Kirkeluten, Oystein; Lovlund, Stig

doi:10.1109/ptc.2013.6652341

Cited by 10 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After the isolation of the hydropower unit, the frequency and voltage gradually become larger and larger than the rated value and trigger the over-frequency over-voltage protection action. The length of time is the second level after isolation [32,33].…”

Section: Methods Basis Of the Proposed Fast Grid Connection Strategymentioning

confidence: 99%

Study on Grid-Connected Strategy of Distribution Network with High Hydropower Penetration Rate in Isolated Operation

et al. 2019

View full text Add to dashboard Cite

As the largest global renewable source, hydropower is a useful supplement to mountainous distribution networks with abundant water resources, and shoulders a large portion of the regulation duty in many power systems. In particular, in the form of decentralized energy sources located to their customers, small hydropower (SHP) improve grid stability by diversifying the electricity system and reducing power loss. The mountainous distribution networks supplied by small hydropower are closed-loop design but open-loop operation, which easily causes the tripping of tie line even further the off-grid operation of small hydropower system. Once the tie line trips, the current countermeasures—such as hydropower shutdown and load shedding—do not fully guarantee the reliability of power supply and the utilization efficiency of hydropower. This paper studies the amplitude-frequency characteristics of SHP off-grid, according to the typical integration of hydropower in South China, a SHP on-grid/off-grid model is established based on the Power Systems Computer Aided Design (PSCAD) platform. It is found that due to the inertia of SHP, the amplitude-frequency characteristics of SHP island system are relatively slow, and the process of non-synchronization with the main grid is gradually expanded. The characteristic of SHP has a certain degree of synchronization with the main grid in the initial island operates stage, which helps to find a novel grid connection method. This paper further proposes the strategy of using fast busbar automatic transfer switch (BATS), which quickly connect the trip-off SHP to the distribution network under the condition of permitting distributed energy grid-connected. The PSCAD simulation results show that proposed strategy has a limited impact on the power grid and prove the effectiveness of the method.

show abstract

Section: Methods Basis Of the Proposed Fast Grid Connection Strategymentioning

confidence: 99%

Study on Grid-Connected Strategy of Distribution Network with High Hydropower Penetration Rate in Isolated Operation

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Power generation stability is still a major challenge to achieve the interconnected system objectives of renewable energy, and new challenges arise (Kundur et al, 1994). Low frequency oscillations related to the generation of hydroelectric energy have occurred in many regions such as Scandinavian power system (Weixelbraun et al, 2013), the Chinese Southern Power Network (Yinsheng, 2013) and the Turkish power system (Gencoglu et al, 2010). There are many studies in the literature about this problem of hydroelectric power plants.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Practical Investigation of Stability Performance for Power Regulation in Hydroelectric Power Plants

Kahraman

Işik

2023

Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi

View full text Add to dashboard Cite

Hydroelectric power plants are the insurance of the interconnected system in order to provide fast energy to the system compared to other fossil fueled power plants. Hydroelectric power plants control the balance between the energy it supplies to the interconnected system and the pressurized water it uses with a system based on the fully automatic control principle. The quality of the energy supplied to the interconnected system depends entirely on this automatic control mechanism. In this study, mathematical models of the mechanisms that affect the automatic control system during the generation of energy in hydroelectric power plants are formed. Transfer functions of the obtained mathematical models are calculated by laplace transform. With the calculated transfer functions, the responses of the units of a hydroelectric power plant to the change of the amount of energy produced under different operating conditions are determined. The obtained data are compared with the actual conditions in a 1330 MW hydroelectric power plant with 8 Francis turbines. It is seen that the mathematical model and the turbine responses in real conditions are similar. In the calculations made at 115, 125, 135, 145 m. net head, the best stability conditions were obtained at 135 m. In addition, as a result of the calculations obtained under different operating conditions, ideal operating conditions are determined to minimize the fluctuations in energy production.

show abstract

“…In [19] as well as in [21] the significant improvement of the damping behavior by an additional power system stabilizer in the turbine governor path (PSS-G) with a high dynamic governor system is presented. For hydropower plants, in [20] the advantageous application of the PSS-G as a damping device is discussed. According to [19] and [20], the governor is only weakly coupled to the power system, which means that changes in grid impedance or node voltages have no big influence to the governor system.…”

Section: Introductionmentioning

confidence: 99%

“…For hydropower plants, in [20] the advantageous application of the PSS-G as a damping device is discussed. According to [19] and [20], the governor is only weakly coupled to the power system, which means that changes in grid impedance or node voltages have no big influence to the governor system. This robust behavior of the governor-turbine system allows the locally designed PSS-G to be used directly for a multi-machine model, which greatly simplifies its design.…”

Section: Introductionmentioning

confidence: 99%

Damping of inter-area oscillations by combining control strategies in hydropower plants

Fank

Renner

2021

Elektrotech. Inftech.

Self Cite

View full text Add to dashboard Cite

This paper examines how the damping capability can be improved if inter-area oscillations occur by combining control strategies in hydropower plants. First, the control challenges of hydropower plants, such as the water hammer effect, are discussed. In a single-machine infinite bus system (SMIBS), the use of a Power System Stabilizer (PSS) in the generator excitation and in the governor control path as well as the combination of both strategies are examined for their effectiveness in terms of their damping capability. In addition, these results are compared with an optimal state space controller with an observer as a damping element. The Heffron-Phillips model is the design model for the PSS as well as for the model-based controller. The verification of the damping capability through the PSS variants is evaluated by using a three-machine model in the time domain and by using modal analysis.

show abstract

Damping low frequency oscillations with hydro governors

Cited by 10 publications

References 4 publications

Study on Grid-Connected Strategy of Distribution Network with High Hydropower Penetration Rate in Isolated Operation

Study on Grid-Connected Strategy of Distribution Network with High Hydropower Penetration Rate in Isolated Operation

Theoretical and Practical Investigation of Stability Performance for Power Regulation in Hydroelectric Power Plants

Damping of inter-area oscillations by combining control strategies in hydropower plants

Contact Info

Product

Resources

About