Page 178 - Mathematical Models and Algorithms for Power System Optimization

Discrete Optimization for Reactive Power Planning 169

6.3.4 Implementation

6.3.4.1 135 node practical system
In this section, a real case is implemented based on the real-scale 135-node system of Chugoku
Electric Power, demonstrating that the proposed algorithm can deal with the real-scale discrete
reactive power optimization. The system is comprised of 36 generators, 98 loads, and 17
transformers, with a base power of 1000MVA. The LP section of the algorithm adopts
HITACMPS-II mathematical programming software package. The 135-node system is shown
in Fig. 6.3.

6.3.4.2 Numerical results of five cases

The numerical performance of the proposed algorithm is examined by five cases of VAR
planning problems. Case 1 is solved to explain the flow chart of the algorithm step by step.
Cases 2–5 are solved to show the effectiveness of the algorithm. Table 6.2 specifies all items
one by one in detail.

Fig. 6.3

135-Node system.

“Voltage bound” means upper and lower bounds of voltage magnitudes for almost all nodes,
not including special nodes. “Initial violations” refers to the number of nodes with violated
mean voltage magnitude and generator reactive power violations of a load flow solution.