| Input: Electrical network information |
| Output: Power flows of branches, frequency violation |
| Step 1: Unbalanced power: Employ Equation (13) to |
| calculate the unbalanced power of the |
| network. |
| Step 2: System frequency characteristic: IF , employ |
| Equation (14) to calculate and go to the next |
| step; ELSE, IF , employ Equation (15) to |
| calculate and go to the next step; ELSE, go to Step 4. |
| Step 3: Frequency calculation: Calculate variation of |
| frequency of the network by Equation (12) solved |
| using improved Euler method (Δt = 0.01 s). |
| Step 4: Generator frequency detection: IF is beyond |
| limits of generator i, cut off generator i and return |
| to Step 3; ELSE, go to the next step. |
| Step 5: Frequency violation: IF is beyond limits |
| the network, end the algorithm and send warnings of |
| of instability; ELSE, go to the next step. |
| Step 6: Power flow calculation: Employ the P-Q power |
| flow to calculate the power flows of every branch. |
