refactor: change pf alg

rspower/examples/test_runpf.txt

@@ -7,6 +7,7 @@
 #include ../lib/make_jac.txt
 #include ../lib/make_sdzip.txt
 #include ../lib/make_sbus.txt
+#include ../lib/newtonpf.txt
 #include ../lib/runpf.txt
 
 return runpf();
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rspower/lib/newtonpf.txt

@@ -53,5 +53,6 @@ fn newtonpf(Ybus, Sbus, V0, ref, pv, pq, mpopt) {
     j5 = j4 + 1;    j6 = j4 + npq;      // j5:j6 - V mag of pq buses
 
     // evaluate F(x0)
-    mis = V .* conj(Ybus * V) - Sbus(Vm);
+    mis = V .* cosnj(Ybus * V) - Sbus(Vm);
+    return V;
 }
\ No newline at end of file

rspower/lib/runpf.txt

@@ -31,13 +31,20 @@ fn runpf() {
     voltage_g = get_multi(V0, gbus_k);
     V_init = set(V0, gbus_k, gen_vg ./ abs(voltage_g) .* voltage_g);
 
+    // build admittance matrices
     Ybus = make_y_bus(baseMVA, bus, branch);
-    repeat = 1;
-    while repeat {
+    qlim = 0;
+    loop {
         // compute bus power injections
         Sbus = make_sbus(baseMVA, bus, gen, 1, 1, 1);
-        repeat = 0;
+        V = newtonpf(Ybus, Sbus, V_init, ref, pv, pq, [1e-8, 100, 0]);
+        if ~~is_empty(V) && qlim {
+            // if V is empty, it means the power flow did not converge
+            break;
+        } else {
+            break;
+        }
     }
 
-    return V_init;
+    return V;
 }
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