A new approach to solid-state on load tap changing transformers

An Improved Control Scheme for On-load Tap Changers with Reduced Harmonics Injection

“…The above drawbacks were greatly reduced with an electronically assisted OLTC regulator topology, as shown in Figure 1(b) [21], although there are various alterations and modifications in the OLTC schemes [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] in between to eliminate the problems already mentioned. The OLTC regulator has a number of tapings on the secondary or primary of the main transformer, which are connected to load terminals through fast-acting solid-state switches.…”

“…However, the recommended techniques used solid-state switches equal to the number of transformer taps, leading to higher initial cost. To minimize the number of switches or taps in an electronic tap changer, a new scheme was proposed with help of a discrete cycle modulation (DCM) technique [15]. Electronic tap changer designs for enhancing the power quality of distribution transformers through several soft-switching techniques were given in [16][17][18][19][20].…”

“…It has considerable limitations and drawbacks, including arcing, high maintenance costs, and slow response time [1]. To address these limitations and drawbacks, new configurations for tap changers have been recommended [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].They have been classified in to two groups: the electronically assisted OLTC regulator [2][3][4][5][6][7][8][9][10] and the fully electronic OLTC regulator [11][12][13][14][15][16][17][18][19][20][21]. Various other feasibility propositions for electronic tap-changing stabilizers have been reviewed for medium-voltage lines [4].…”

A new strategy based on ANN for controlling the electronic on‐load tap changer

“…The OLTC with mechanical switches are used in the electrical networks for the past decades. It has many drawbacks such as required high cost maintenance for the mechanical parts, slow response, and high losses. Moreover, the spark in the contacts of diverter switches is considered as the greatest important problem of the mechanical OLTC .…”

Active and reactive dispatch with minimum control movements

“…The operation of tap transformers, shunt capacitors are subject to wear and tear. Frequent adjustments (control actions) could lead to general deterioration of the devices [17][18][19][20]. Adjustments of these apparatus are required for maintaining the steady and economic operating condition of the power system [9][10][11].…”