network/check.cpp

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

EXPORT int check(void)
{
    unsigned int errcount=0;
    OBJECT *obj;
    FINDLIST *nodes = gl_find_objects(FL_NEW,FT_CLASS,SAME,"node",FT_END);
    FINDLIST *links = gl_find_objects(FL_NEW,FT_CLASS,SAME,"link",FT_END);
    FINDLIST *swings = gl_find_objects(FL_NEW,FT_CLASS,SAME,"node",AND,FT_PROPERTY,"type",EQ,"3",FT_END);

    // check links for connectivity
    int linkcount[10000];
    memset(linkcount,0,sizeof(linkcount));
    obj=NULL;
    while ((obj=gl_find_next(links,obj))!=NULL)
    {
        link *branch=OBJECTDATA(obj,link);
        if (branch->from==NULL && branch->to==NULL)
        {
            gl_error("link:%d is not connected on either end", obj->id);
            errcount++;
        }
        else if (branch->from==NULL) 
        {
            gl_error("link:%d is not connected on 'from' end", obj->id);
            errcount++;
            linkcount[branch->to->id]++;
        }
        else if (branch->to==NULL) 
        {
            gl_error("link:%d is not connected on 'to' end", obj->id);
            errcount++;
            linkcount[branch->from->id]++;
        }
        else
        {
            linkcount[branch->to->id]++;
            linkcount[branch->from->id]++;
            if (branch->Y.Mag()==0)
                gl_warning("link:%d is open", obj->id);
        }
    }

    // find swing buses and check link connectivity
    struct {
        OBJECT *swing;
        int count;
    } areas[1000];
    memset(areas,0,sizeof(areas));
    obj=NULL;
    while ( (obj=gl_find_next(nodes,obj))!=NULL)
    {
        node *bus=OBJECTDATA(obj,node);
        int n = bus->flow_area_num;
        areas[n].count++;
        if (bus->type==SWING)
        {
            if (areas[n].swing!=NULL)
                gl_warning("flow area %d has more than one swing bus (node:%d and node:%d)", n, areas[n].swing->id, obj->id);
            else
                areas[n].swing = obj;
        }
        if (linkcount[obj->id]==0)
            gl_warning("node:%d is not connected to anything", obj->id);
    }

    // check each area
    int i;
    for (i=0; i<sizeof(areas)/sizeof(areas[0]); i++)
    {
        if (areas[i].count>0 && areas[i].swing==NULL)
        {
            gl_error("flow area %d has no swing bus", i);
            errcount++;
        }

    }

    // check for islands without swing buses
    obj=NULL;
    OBJECTNUM bus[10000];
    memset(bus,0xff,sizeof(bus));
    while ( (obj=gl_find_next(swings,obj))!=NULL)
    {
        // mark swing bus
        bus[obj->id]=obj->id;

        // scan all links to spread swing info until no changes made
        bool changed;
        do {
            OBJECT *p=NULL;
            changed=false;
            while ((p=gl_find_next(links,p))!=NULL)
            {
                link *q=OBJECTDATA(p,link);
                OBJECT *f = q->from;
                OBJECT *t = q->to;
                if (f==NULL || t==NULL)
                    continue;
                if (bus[f->id]==obj->id && bus[t->id]==0xffffffff)
                {
                    changed = true;
                    bus[t->id]=obj->id;
                }
                else if (bus[t->id]==obj->id && bus[f->id]==0xffffffff)
                {
                    changed = true;
                    bus[f->id]=obj->id;
                }
            }
        } while (changed);
    }
    obj=NULL;
    while ( (obj=gl_find_next(nodes,obj))!=NULL)
    {
        if (bus[obj->id]==0xffffffff)
        {
            gl_warning("node:%d is not connected to any swing bus", obj->id);
            errcount++;
        }
    }
    gl_free(nodes);
    gl_free(links);

    gl_output("Network check complete: %d errors found",errcount);
    return errcount;
}

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GridLAB-D™ Version 4.1

An open-source smart grid simulator created by PNNL for the US Department of Energy Office of Electricity