network/import.cpp

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#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <math.h>
#include "network.h"

int import_cdf(char *file)
{
    int n_bus=0;
    int n_branch=0;
    int linenum=0;
    int errors = 0; 
    OBJECT *bus[10000]; memset(bus,0,sizeof(bus));// CDF does not allow more than 9999 as a bus no
    OBJECT *branch[10000]; memset(branch,0,sizeof(branch));// CDF does not allow more than 9999 as a bus no
    // allow up to 100 zones
    OBJECT *swing[100]; memset(swing,0,sizeof(swing)); 
    int count[100]; memset(count,0,sizeof(count)); 
    char line[1024];
    char *ff = gl_findfile(file,NULL,FF_READ);
    FILE *fp = ff?fopen(ff, "r"):NULL;
    OBJECT *obj;
    enum {LD_INIT, LD_READY, LD_BUS, LD_BRANCH} state = LD_INIT;
    // model variables
    // branch variables

    if (fp==NULL)
        return 0;
    while (fgets(line,sizeof(line),fp)!=NULL)
    {
        linenum++;
        switch (state) {
        case LD_INIT:
            if (sscanf(line+31,"%lg",&mvabase)==1)
                state=LD_READY;
            break;
        case LD_READY:
            if (mvabase>0 && strncmp(line,"BUS",3)==0)
                state = LD_BUS;
            else if (mvabase>0 && strncmp(line,"BRANCH",6)==0)
                state = LD_BRANCH;
            /* ignore line otherwise */
            break;
        case LD_BUS:
            if (atoi(line)>0)
            {   int n, area, zone, type;
                int64 remote;
                char32 name;
                double Vm, Va, Lr, Li, Gr, Gi, bV, dV, Qh, Ql, G, B;
                if (sscanf(line,"%d %12[^\n] %d %d%d %lg %lg %lg %lg %lg %lg %lg %lg %lg %lg %lg %lg %" FMT_INT64 "d", 
                    &n, name, &area, &zone, &type, &Vm, &Va, &Lr, &Li, &Gr, &Gi, &bV, &dV, &Qh, &Ql, &G, &B, &remote)==18 && n_bus<10000)
                {
                    obj = gl_create_object(node_class,sizeof(node));
                    obj->parent = NULL;
                    bus[n] = obj;
                    node *p = OBJECTDATA(obj,node);
                    p->create();
                    p->bus_id = n;
                    strncpy(p->name,name,sizeof(p->name));
                    p->flow_area_num = area;
                    p->loss_zone_num = zone;
                    p->type = (BUSTYPE)type;
                    p->V.SetPolar(Vm,Va*PI/180);
                    p->S.SetRect((Gr-Lr)/mvabase,(Gi-Li)/mvabase); /* loads are negative, gen is positive */
                    p->base_kV = bV;
                    p->desired_kV = dV;
                    p->Qmax_MVAR = Qh;
                    p->Qmin_MVAR = Ql;
                    p->G = G;
                    p->B = B;
                    p->remote_bus_id = (OBJECT*)remote;
                    if (p->type==SWING) swing[area]=obj;
                    count[area]++;
                    n_bus++;
#ifdef DEBUG_OBS
                    if (p->type!=PQ) 
                    {
                        p->Vstdev = 0.01;
                        p->Vobs.Re() = gl_random_normal(p->V.Re(),p->Vstdev);
                        p->Vobs.Im() = gl_random_normal(p->V.Im(),p->Vstdev);
                    }
                    if (p->type!=SWING) 
                        p->V = complex(1,0);
                    else if (p->Vstdev>0)
                        p->V.SetPolar(p->Vobs.Mag(),0);
#endif
                }
                else
                {
                    gl_output("%s(%d) : missing bus data", file, linenum);
                    errors++;
                }
            }
            else
                state = LD_READY;
            break;
        case LD_BRANCH:
            if (atoi(line)>0)
            {   int from, to, area, zone, type, circuit;
                double R, X, B, n=0;
                if (sscanf(line,"%d %d %d %d %d %d %lg %lg %lg %*lg %*lg %*lg %*d %*d %lg",
                    &from,&to,&area,&zone,&type,&circuit,&R,&X,&B, &n)>=9 && n_branch<10000)
                {
                    obj = gl_create_object(link_class,sizeof(link));
                    obj->parent = NULL;
                    branch[n_branch] = obj;
                    link *p = OBJECTDATA(obj,link);
                    p->create();
                    p->from = bus[from];
                    p->to = bus[to];
                    if (n>0.0)
                        p->turns_ratio = n;
                    else
                        p->turns_ratio = 1.0;
                    p->Y = complex(1)/complex(R,X); 
                    p->B = B;
                    n_branch++;
                }
                else
                {
                    gl_output("%s(%d) : missing branch data", file, linenum);
                    errors++;
                }
            }
            else
                state = LD_READY;
            break;
        default:
            break;
        }
    }
    fclose(fp);

    int n;
    // check area for swing buses
    for (n=0; n<sizeof(count)/sizeof(count[0]); n++)
    {
        if (count[n]>0 && swing[n]==NULL)
        {
            gl_output("%s : flow area %d has no swing bus", file, n);
            errors++;
        }
    }

    // fixup parent swing bus and remote bus, if any
    for (n=0; n<sizeof(bus)/sizeof(bus[0]); n++)
    {
        OBJECT *obj = bus[n];
        if (obj==NULL) continue;
        node *p = OBJECTDATA(obj,node);
        if (p->type!=SWING)
        {
            OBJECT *swingbus = swing[p->flow_area_num];
            if (swingbus!=NULL)
                gl_set_parent(obj,swingbus);
        }
        p->remote_bus_id= bus[(int64)p->remote_bus_id];
    }

    // branch parent is bus of lowest rank
    for (n=0; n<sizeof(branch)/sizeof(branch[0]); n++)
    {
        OBJECT *obj = branch[n];
        if (obj==NULL) continue;
        link *p = OBJECTDATA(obj,link);
        if (p->from!=NULL && p->to!=NULL)
            gl_set_parent(obj, p->from->rank<p->to->rank ? p->from : p->to);

        // update injections to node
        p->sync(TS_NEVER);
    }

    return errors>0 ? -errors : n_bus+n_branch;
}
EXPORT int import_file(char *file)
{
    char *ext = strrchr(file,'.');
    if (ext!=NULL && stricmp(ext,".cdf")==0)
        return import_cdf(file);
    errno = ENOENT;
    return 0;
}

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