Power System Multi-machine Frequency Response Model Aggregation of Thermal Power Unit and Hydro Turbine Generator

2020 ◽  
Author(s):  
Jihong Tang ◽  
Hongbin He ◽  
Gaocai Yang ◽  
Shuai Xiao ◽  
Mengjiao Li
Keyword(s):  
Power System ◽  
Frequency Response ◽  
Power Unit ◽  
Thermal Power ◽  
Response Model ◽  
Turbine Generator ◽  
Hydro Turbine ◽  
Model Aggregation

Optimizing the Allocation of the Relay Setting Related to Power Grid and over Frequency Generator Tripping Scheme

2014 ◽  
Vol 986-987 ◽  
pp. 404-411
Author(s):  
Qi Yang ◽  
Xin Zeng ◽  
Qing Kui Guo ◽  
Yong Yu Yuan ◽  
Jian Jun Sun ◽  
...  
Keyword(s):  
Power System ◽  
Steam Turbine ◽  
Power Unit ◽  
Program Analysis ◽  
Thermal Power ◽  
Protection Device ◽  
Power Network ◽  
Whole Process ◽  
Islanding Operation ◽  
Frequency Generator

Through the summary of typical accident, the problem between the over speed protection device of thermal power unit steam turbine and over frequency generator tripping measure is analyzed in island operation of sending ends of regional grid. The optimizing allocation principle between over frequency generator tripping measure and over speed protection equipment is put forward. By a variety of program analysis and comparison, the optimizing scheme is given. Finally, the typical models of thermal power unit steam turbine over speed protection are established in software. Based on a practical power system as an example, the whole process of islanding is simulated. Checking the coordination with existing over frequency generator tripping measure and the relay setting related to power network in the islanding operation, the validity and practicability of the optimal scheme and principle are analyzed. With the method, the regional grid will remain safe and stable.

scholarly journals Subsynchronous Resonance and FACTS-Novel Control Strategy for Its Mitigation

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Doan Duc Tung ◽  
Le Van Dai ◽  
Le Cao Quyen
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Control Strategy ◽  
Power Plants ◽  
Thermal Power ◽  
Transmission System ◽  
Static Synchronous Compensator ◽  
Turbine Generator ◽  
Subsynchronous Resonance ◽  
Ac Transmission

The subsynchronous resonance (SSR) is an important problem in the power system, and especially the series compensated transmission lines may cause SSR in the turbine generators, such that it leads to the electrical instability at subsynchronous frequencies and potential turbine-generator shaft failures. Taking the Vietnamese Vungang thermal plants as an example, a shaft failure of Vungang I thermal power unit has occurred on November 24, 2015, due to SSR. The main cause for this failure is a resonance caused by the series capacitors on the 500 kV grid. This paper analyzes the SSR based on the location of shaft cracks and turbine generator mode shape for Vungang I and II thermal power plants. On the basis of that, it develops a novel control strategy for each Flexible AC Transmission system (FACTS) device as the thyristor controlled series compensator (TCSC), static VAR compensator (SVC), and static synchronous compensator (STATCOM). Then they are comparable to one another in order to choose a feasible solution for mitigating the SSR. The effectiveness of the proposed control strategy is verified via time domain simulation of the Vietnamese 500/220 kV transmission system using EMTP-RV and PSS/E programs. The obtained results show that the proposed strategy for SVC can be applied to immediately solve the difficulties encountering in the Vietnamese power system.

scholarly journals Multi-Time Scale Rolling Economic Dispatch for Wind/Storage Power System Based on Forecast Error Feature Extraction

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 2124 ◽  
Author(s):  
Li Han ◽  
Rongchang Zhang ◽  
Xuesong Wang ◽  
Yu Dong
Keyword(s):  
Power System ◽  
Real Time ◽  
Wind Power ◽  
Power Unit ◽  
Time Scale ◽  
Forecast Error ◽  
Thermal Power ◽  
Time Error ◽  
The Real ◽  
The Impact

This paper looks at the ability to cope with the uncertainty of wind power and reduce the impact of wind power forecast error (WPFE) on the operation and dispatch of power system. Therefore, several factors which are related to WPFE will be studied. By statistical analysis of the historical data, an indicator of real-time error based on these factors is obtained to estimate WPFE. Based on the real-time estimation of WPFE, a multi-time scale rolling dispatch model for wind/storage power system is established. In the real-time error compensation section of this model, the previous dispatch plan of thermal power unit is revised according to the estimation of WPFE. As the regulating capacity of thermal power unit within a short time period is limited, the estimation of WPFE is further compensated by using battery energy storage system. This can not only decrease the risk caused by the wind power uncertainty and lessen wind spillage, but also reduce the total cost. Thereby providing a new method to describe and model wind power uncertainty, and providing economic, safe and energy-saving dispatch plan for power system. The analysis in case study verifies the effectiveness of the proposed model.

Frequency Response Model and Its Closed-form Solution of Two-machine Equivalent Power System

2020 ◽  
pp. 1-1
Author(s):  
Jiakai Shen ◽  
Li Wei-Dong ◽  
Liu Liu ◽  
Cuicui Jin ◽  
Kerui Wen ◽  
...  
Keyword(s):  
Power System ◽  
Frequency Response ◽  
Closed Form ◽  
Closed Form Solution ◽  
Form Solution ◽  
Response Model

Low-Order Frequency Response Model in the Application of Frequency Control

2012 ◽  
Vol 518-523 ◽  
pp. 3820-3825
Author(s):  
Gao Zheng
Keyword(s):  
Power System ◽  
Frequency Response ◽  
Time Constant ◽  
Frequency Control ◽  
Accurate Method ◽  
Order System ◽  
Response Model ◽  
Large Power ◽  
System Frequency ◽  
Low Order

This paper introduces a low-order system frequency response model (SFR). SFR model is simplified from other models, which can be used to estimate the frequency response of a large power system, or sudden load disturbance of the island.SFR model is based on the neglecting nonlinear power system of u the units equation, which is controlled by the steam turbine generator . This means that the generator inertia and reheat time constant make system average frequency response. In addition, because of the two time constant , the resulting frequency response can be calculated in the closed loop form, which provides a simple and accurate method to estimate the essential characteristics of the system frequency response.

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