Power flow solution with remote voltage control

Load flow models of three patterns in two types were established according to characteristics of each model, while introducing two new bus types, P type and PQV type. As for first pattern, i.e. one-to-one control model through reactive power injection, the voltage constraint of P bus is replaced with the voltage constraint of PQV bus. The constraint equations of all bus including the new bus types is enough for solution, but for the multi-to-one model, reactive power distribution equations are required. The third model realizes remote voltage control through voltage regulator or load tap changing transformer (LTC). The taps are set to be variable, which integrates the solution of control variable with the power flow solution. The expressions of Jacobian matrix and modification vectors while using Newton-Rapshon method for solution were given, and both characteristics of them were analyzed. The test result implies the method proposed is effective and has good application foreground.