Page 207 - Mathematical Models and Algorithms for Power System Optimization

198 Chapter 6

Start

Take power flow
Step 1 as initial value

Solve LP problem
with integer relaxed

No Make it feasible with
Whether feasible?
Step 2 expert rules
Yes
No
Convergence?

Yes
Determine integer solution
Step 3 with expert rules

Step 4 Calculate power flow
after optimization

Yes
Whether feasible?
No

Step 5 Solve MINLP problem

Stop

Fig. 6.7
Flow chart of discrete VAR optimization algorithm based on expert rules.

chapter can provide constraints and variables when LP is not feasible. Although the over limit
value of the linear solution is different from the one of the nonlinear solution, the algorithm
first requires obtaining the linear feasible solution.
The purpose of applying an expert system approach is to make the relaxed solution feasible. The
expert system is established and implemented from practical experience and knowledge of
system planners and operators. The following rules are used when searching for a feasible
relaxed solution, which comes from practical experience.