Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Dynamic programming

Unit Commitment Solution Based on Improved Particle Swarm Optimization Method

Ali I. Abbas; Afaneen Anwer

Engineering and Technology Journal, 2021, Volume 39, Issue 10, Pages 1601-1609
DOI: 10.30684/etj.v39i10.2114

This paper presents an algorithm to solve the unit commitment problem using the intelligence technique based on improved Particle Swarm Optimization (IPSO) for establishing the optimal scheduling of the generating units in the electric power system with the lowest production cost during a specified time and subjected to all the constraints. The minimum production cost is calculated based on using the Lambda Iteration method. A conventional method was also used for solving the unit commitment problem using the Dynamic Programming method (DP). The two methods were tested on the 14-bus IEEE test system and the results of both methods were compared with each other and with other references. The comparison showed the effectiveness of the proposed method over other methods.

A Proposed Algorithm for Reactive Power & Voltage Coordination in Distribution Systems Using Fuzzy Technique

Aws Habib Mohammed; Afaneen Anwar Al-Khazragy

Engineering and Technology Journal, 2009, Volume 27, Issue 12, Pages 2447-2464

This method finds the Under Load Tap Changer (ULTC) position and
capacitor ON/OFF status of each hour for the next day in main or secondary
distribution substations, so the secondary bus voltage improves and the reactive
power flow into the transformer can be restrained at the same time. The only
condition to achieve these goals is the previous knowledge (by forecasting) of
load demand for active and reactive power and the primary bus voltage for each
hour of that day. The practical constraints are involved through the use of
membership concept in fuzzy set theory, where these constraints are bus voltage
limits, the tolerable worst power factor & the maximum allowable number of
switching operations for the Load Tap Changer (LTC) and capacitor in a day. This
method is also considering the variation of load active & reactive power with its
voltage, where the loads are classified into three categories according to their
relationship with voltage, and so there are constant impedance loads, constant
current loads and constant power loads. To demonstrate the usefulness of this
method an example on one of the Iraqi national grid substations (132/33KV
Yarmook substation) was made in MATLAB.