MATHEMATICAL MODELING OF THE AUTOMATIC CONTROL SYSTEM DEVICE-LOAD SUPPLY TRANSFORMER WITH CONNECTION SCHEME "TRIANGLE/ZIGZAG WITH ZERO"

For modern power supply systems especially important question is to improve the quality of electricity. Existing methods and technical means of reducing the levels of quality indicators in Power Networks although they are very effective, but require a substantial capital investment, which hinders their widespread distribution. One solution this problem is to improve the automatic control of means of voltage regulation. The article offered by improving the automatic control of contactless on-load tap changer device of power transformer with winding connection circuit "D/Zg" to achieve simultaneous reduction in levels of steady voltage deviation and voltage unbalance for the negative sequence in electric networks with grounded neutral. The basis of the proposed automatic control system charged of multicriteria optimization mathematical tools. Proposed a method of solving the problem of multicriteria optimization to choose the method to approach to the utopian point in the space of criteria. At work created the block diagram of the automatic control of the on-load tap changer, researched the quality of its work compared with the classical automatic control system by mathematical modeling. Simulation results indicate a significant advantage of the proposed system of automatic control of existing by reducing not only the steady voltage deviation, but the coefficient of unbalance of negative sequence voltage is too.