If control of real and reactive powers supplied to the grid is required, and references P* and Q* are provided, propose a method to implement this scheme, assuming the d-q reference frame is used, and the grid voltage is therefore expressed as (va + Jvg). Write the necessary formulae and draw a simple block diagram to illustrate your idea.

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Nodal Analysis

In the analysis of any electric circuit, nodal analysis is the method of determining the potential difference or voltage between different nodes in an electric circuit. A node is a point where two or more branches connect each other. In the nodal analysis, the voltages are determined in the terms of branch currents. The nodal analysis is also known as the node voltage method or branch current method. The nodal analysis method is one of the several applications of Kirchhoff's Current Law (KCL).