scholarly journals Small-Signal Stability Analysis of Photovoltaic-Hydro Integrated Systems on Ultra-Low Frequency Oscillation

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 1012 ◽  
Author(s):  
Sijia Wang ◽  
Xiangyu Wu ◽  
Gang Chen ◽  
Yin Xu
Keyword(s):  
Dynamic Model ◽  
Oscillation Mode ◽  
Low Frequency ◽  
Small Signal ◽  
Frequency Oscillation ◽  
Ultralow Frequency ◽  
Oscillation Modes ◽  
Pv Generation ◽  
The Impact ◽  
Signal Dynamic

In recent years, ultralow-frequency oscillation has repeatedly occurred in asynchronously connected regional power systems and brought serious threats to the operation of power grids. This phenomenon is mainly caused by hydropower units because of the water hammer effect of turbines and the inappropriate Proportional-Integral-Derivative (PID) parameters of governors. In practice, hydropower and solar power are often combined to form an integrated photovoltaic (PV)-hydro system to realize complementary renewable power generation. This paper studies ultralow-frequency oscillations in integrated PV-hydro systems and analyzes the impacts of PV generation on ultralow-frequency oscillation modes. Firstly, the negative damping problem of hydro turbines and governors in the ultralow-frequency band was analyzed through the damping torque analysis. Subsequently, in order to analyze the impact of PV generation, a small-signal dynamic model of the integrated PV-hydro system was established, considering a detailed dynamic model of PV generation. Based on the small-signal dynamic model, a two-zone and four-machine system and an actual integrated PV-hydro system were selected to analyze the influence of PV generation on ultralow-frequency oscillation modes under different scenarios of PV output powers and locations. The analysis results showed that PV dynamics do not participate in ultralow-frequency oscillation modes and the changes of PV generation to power flows do not cause obvious changes in ultralow-frequency oscillation mode. Ultra-low frequency oscillations are mainly affected by sources participating in the frequency adjustment of systems.

Modal Research on the Low-Frequency Oscillation of AC/DC System with DFIG-Based Wind Farms

2014 ◽  
Vol 672-674 ◽  
pp. 331-336
Author(s):  
Jing Biao Wang ◽  
Xi Wang Abuduwayiti ◽  
Qin Chao ◽  
Qing Luo
Keyword(s):  
Low Frequency ◽  
Wind Farms ◽  
Small Signal ◽  
Small Signal Stability ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Dc System ◽  
Signal Stability ◽  
Oscillation Modes ◽  
Power Dispatching

Low-frequency oscillation characteristics of AC / DC system with DFIG-based wind farms were studied. Detailed mathematical pure AC and AC / DC system model were established by considering the effects of doubly-fed wind turbine model and DC transmission dynamic model to do small signal stability analysis. The computed results of small signal stability of DFIG-based wind farms integrating pure AC CEPRI36 nodes system or with DC transmission that operated in four connection modes including bipolar neutral grounding at both ends mode, monopole ground return mode, monopole metallic return mode , monopole and two parallel conductor mode with earth return were investigated by using modal analysis method. Then, the characteristics of local oscillation modes and inter-area oscillation modes were respectively analyzed under the two operation modes of the wind farm participating active power dispatching and reactive power dispatching and consequently some new conclusions were drawn.

The Impact of Wind Generation on Low Frequency Oscillation in Power Systems

2021 ◽  
Author(s):  
Mohammad M. Almomani ◽  
Abdullah Odienat ◽  
Seba F. Al-Gharaibeh ◽  
Khaled Alawasa
Keyword(s):  
Power Systems ◽  
Low Frequency ◽  
Wind Generation ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
The Impact

Effect of Large-Scale Wind Power Integration on Inter-Area Oscillation of Power System

2014 ◽  
Vol 672-674 ◽  
pp. 227-232
Author(s):  
Xu Zhi Luo ◽  
Hai Feng Li ◽  
Hua Dong Sun ◽  
An Si Wang ◽  
De Zhi Chen
Keyword(s):  
Power Systems ◽  
Power System ◽  
Wind Power ◽  
Large Scale ◽  
Oscillation Mode ◽  
Equivalent Model ◽  
Synchronous Generators ◽  
Actual System ◽  
Oscillation Modes ◽  
The Impact

With the fast development of the wind power, security constraints of power systems have become the bottleneck of the acceptable capacity for wind power. The underdamping oscillation modes of the inter-area is an important aspect of the constraints. In this paper, an equivalent model of a power system with wind plants has been established, and the impact of the integration of the large-scale wind power on the inter-area oscillation modes has been studied based on the frequency-domain and time-domain simulations. The results indicate that the damping of inter-area oscillation mode can be enhanced by the replacement of synchronous generators (SGs) with the wind generators. The enhancing degree is up to the participation value of the SGs replaced. The conclusion has been verified by the actual system example of Xinjiang-Northwest grid. It can provide a reference for system programming and operation.

Sign in / Sign up

Export Citation Format

Share Document