This paper researched steady power flow control with variable inequality constraints. Since the inverse function
of power flow equation is hard to obtain, differentiation coherence algorithm was proposed for variable inequality
which is tightly constrained. By this method, tightly constrained variable inequality for variables adjustment relationships
was analyzed. The variable constrained sensitivity which reflects variable coherence was obtained to archive accurate extreme
equation for function optimization. The hybrid power flow mode of node power with branch power was structured.
It also structured the minimum variable model correction equation with convergence and robot being same as conventional
power flow. In fundamental analysis, the effect of extreme point was verified by small deviation from constrained extreme
equation, and the constrained sensitivity was made for active and reactive power. It pointed out possible deviation
by using simplified non-constrained sensitivity to deal with the optimization problem of active and reactive power. The
control solutions for power flow for optimal control have been discussed as well. The examples of power flow control and
voltage management have shown that the algorithm is simple and concentrated and shows the effect of differential coherence
method for extreme point analysis.
A Study of a DC/AC Conversion Structure for Photovoltaic System Connected to the Grid with Active and Reactive Power Control
