Theoretical analysis of two-area interconnected system tie-line power oscillation

2011 ◽  
Author(s):  
Hui Liu ◽  
Tao Wu ◽  
Minnan Wang
Keyword(s):  
Theoretical Analysis ◽  
Interconnected System ◽  
Power Oscillation ◽  
Tie Line

Fast Computation of Sample Entropy in Forced Oscillation Detection

2014 ◽  
Vol 602-605 ◽  
pp. 1807-1810
Author(s):  
Zhen Shan Zhu ◽  
Di Chen Liu ◽  
Qing Fen Liao
Keyword(s):  
Power Systems ◽  
Forced Oscillation ◽  
Sample Entropy ◽  
Stable Operation ◽  
Power Oscillation ◽  
Effectiveness And Efficiency ◽  
Oscillation Detection ◽  
Tie Line ◽  
Fast Dynamic

Forced power oscillation in power systems has a serious influence to the safe and stable operation of power systems. A fast dynamic sample entropy algorithm is proposed based on sample entropy in this paper. The change of dynamic sample entropy of the tie-line power is analyzed to determine whether the forced power oscillation happened. Case study on the 4-machine 2-area system shows the effectiveness and efficiency of the proposed methodology.

scholarly journals A systematic approach to evaluating the influence of demand side management resources on the interarea capacity benefit margin

2019 ◽  
Vol 8 (4) ◽  
Author(s):  
Olatunji Obalowu Mohammed ◽  
Mohd Wazir Mustafa ◽  
Daw Saleh Sasi Mohammed ◽  
Sani Salisu ◽  
Nabila Ahmad Rufa’i
Keyword(s):  
Systematic Approach ◽  
Demand Side Management ◽  
Test System ◽  
Demand Side ◽  
Available Transfer Capability ◽  
Interconnected System ◽  
Transfer Capability ◽  
Supply Capacity ◽  
Efficient Power ◽  
Tie Line

Available transfer capability is an index to measure the security and economic viability of an interconnected system. However, to accurately determine this index, other associated parameters need to be accurately evaluated. One of these parameters is the capacity benefit margin (CBM). For efficient power generation reliability and sustainability, a certain amount of supply capacity is commonly reserved by utilities, which in most cases remain unused, to reduce the effect of generation outage. To minimize this unused reserve, utilities usually reserve a predetermined amount of tie-line capacity between interconnected areas to have access to external supply. This tie-line reserved for this purpose is termed as capacity benefit margin (CBM). In this paper a technique for computing CBM is used, the sensitivity of CBM support from other areas to the increase in load in one of the areas is investigated, and conclusively, demand side management is proposed to improve the quantification of CBM. The contribution of this work is the assessment of the CBMs support from other areas during a critical condition, using the flexibility of DSM technique. The modified 24-bus IEEE reliability test system is employed for the verification of the approach.

scholarly journals Load Frequency Control of Two Area Hydro-Thermal System Considering GRCs and GDB Non Linearity’s with Intelligent Controller

2020 ◽  
Vol 8 (5) ◽  
pp. 4697-4705
Keyword(s):  
Fuzzy Controller ◽  
Magnetic Energy ◽  
Load Frequency Control ◽  
System Dynamic ◽  
Dynamic Responses ◽  
Energy Storage Devices ◽  
Interconnected System ◽  
Band Theory ◽  
Proportional Integral ◽  
Tie Line

This paper focuses on design and development of intelligent based optimal secondary controller which could sustain with system dynamic conditions to maintain frequency and tie-line power exchange with in specified limits. For analysis purpose, a two area interconnected system comprising of thermal and hydro units in each area with system non linearity’s like generation rate constraints (GRC) and governor dead band theory (GDB) are considered to get more practical approach. System frequency and tie-line variations are observed in MATLAB/ SIMULINK platform for 1% step load perturbation (SLP) in area-1. Proportional- integral (PI), proportional-integral-derivative (PID) and Fuzzy-PID controllers are employed as secondary controllers one at a time, whose gains are optimized with Grey wolf optimization (GWO) algorithm. Later, the system dynamic responses are investigated by incorporating superconducting magnetic energy storage devices (SMES) in both areas and static synchronous series compensator (SSSC) placed in series with the tie-line. Investigation reveals the superiority of fuzzy controller with coordinated performance of SMES and SSSC in mitigating frequency deviations and tie-line power variations. Finally, sensitivity analysis is carried out to test robustness of proposed coordinated control scheme.

scholarly journals AC Tie-Line Power Oscillation Mechanism and Peak Value Calculation for a Two-Area AC/DC Parallel Interconnected Power System Caused by LCC-HVDC Commutation Failures

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1221 ◽  
Author(s):  
Li Sun ◽  
Hongbo Liu ◽  
Chenglian Ma
Keyword(s):  
Power System ◽  
High Voltage ◽  
Rapid Development ◽  
Damping Ratio ◽  
Oscillation Mode ◽  
Peak Time ◽  
Interconnected Power System ◽  
Power Oscillation ◽  
Tie Line ◽  
Peak Value

With the rapid development of ultra-high-voltage (UHV) AC/DC, especially the step-by-step upgrading of the UHV DC transmission scale, security presents new challenges. Commutation failure (CF) is a common fault in line commutated converter (LCC) high-voltage direct current (HVDC) power systems. Once failure happens, it may cause power oscillations in a system. In this paper, taking a two-area AC/DC parallel interconnected power system as the example, based on the impulse response model of second-order linear system, the mechanism of power oscillation on the AC tie-line caused by CF are clarified. It is proved that the peak value of the AC tie-line power oscillation is mainly determined by the DC power and the equivalent CF duration, the frequency and damping ratio of dominant area oscillation mode. Meanwhile, the peak time is mainly determined by the oscillation frequency. Finally, the correctness and effectiveness of the algorithms are verified by a simulation analysis of an extended IEEE-39-bus AC/DC parallel interconnected power system. These research results can provide a basis for the arrangement of the operating modes and the formulation of control measures for interconnected power grids.

Automatic Generation Control of Interconnected Power System using Cuckoo Optimization Algorithm

2015 ◽  
Vol 4 (2) ◽  
pp. 22-35
Author(s):  
Shanchari Laik ◽  
Shatabdi Dey ◽  
Puja Das ◽  
Sneha Sultana ◽  
Sourav Paul ◽  
...  
Keyword(s):  
Power System ◽  
Optimization Algorithm ◽  
Dynamic Performance ◽  
Automatic Generation ◽  
Automatic Generation Control ◽  
Interconnected System ◽  
Cuckoo Optimization Algorithm ◽  
Interconnected Power System ◽  
Generation Control ◽  
Tie Line

Automatic generation control (AGC) is added in power system to ensure constancy in frequency and tie-line power of an interconnected multi-area power system. In this article, proportional integral (PI) controlled based AGC of two-area hydrothermal system is solved by cuckoo optimization algorithm (COA). It is one of the most powerful stochastic real parameter optimization in current use. The design objective is to improve the dynamic performance of the interconnected system following a disturbance. System performance is examined considering 1% step load perturbation in thermal area with generation rate constraints. The results are compared with BBO, GA and DE to show the effectiveness of the proposed method. Computed results shows that the proposed method effectively improve the performance of the objective function with corresponding minimization of the overshoot, undershoot and settling time to reach steady state.

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