Centralized monitoring of the power electronics devices

Centralized monitoring of the power electronics devices  

In  cooperation  with  numerous  users,  according  to  their  needs,  requests,  suggestions,  and  recommendations,  and  based  on the long-term research in the field of remote monitoring and control  of  power  electronics  devices,  the  authors  created  a  monitoring   system   optimized   according   to   the   needs   of   maintenance    sectors.    There    are    various    users:    from    telecommunication  companies,  through  power  generation  and  distribution  companies,  to  special  users.  About  six  hundred  devices  designed  for  remote  monitoring  and  control  of  power  electronics  devices  have  been  installed  so  far.  Each  of  these  users  had  some  specificities,  so  this  system  adapted  them.  29  papers about the method of realization of the power electronics devices’   monitoring   and   control,   and   about   the   observed   problems  in  the  operation  of  the  power  supply  system  were  published at national and international conferences.

Most of the papers analyzed the observed problems in the operation of one power  electronics  device  or  several  power  electronics  devices  (systems)    that    together    realized    the    function    of    an    uninterruptible  power  supply.  The  analyses  were  conducted  using  the  data  collected  on-site,  in  the  system  operation,  real-time,  through  dedicated  monitoring  devices.  Some  papers  deal  with  the  analysis  and  organization  of  remote  monitoring  and  control.   Solutions   aiming   to   provide   better   (faster,   more   technically efficient, more economically efficient) operation of monitoring  sectors  have  been  proposed.  The  main  purpose  of  the monitoring system is to reduce the interruption time of the energy  consumers  due  to  malfunction  of  power  electronics  devices,  but  also  to  increase  the  working  efficiency  of  the  maintenance   sectors.  

This   paper   describes   some   observed   shortcomings  in  the  typical  organization  of  remote  monitoring  of  power  electronics  devices  and  suggests  one  solution  for  the  organization   of   remote   monitoring   and   control,   optimized   according   to   existing   monitoring   sectors.   In   addition   to   monitoring  the  certain  power  system  element’s  operation,  the  realized solution monitors the interaction of the devices, so the monitoring sectors can prevent interruptions in the operation of power systems by timely intervention.

The described alarm state detection analysis shows that the monitoring  of  power  electronics  devices  via  microcomputers  incorporated    in    some    system    elements    has    numerous    shortcomings.   By   analyzing   the   different   power   supply   systems,  it  is  concluded  that  monitoring  of  the  local  power  system  is  not  adequate.  The  collected  data  are  not  always  reliable  and  are  not  displayed  in  the  form  required  for  the  operation  of  the  relevant  maintenance  sectors.  Based  on  the  authors' experience, it was concluded that system monitoring is best  solved  if  a  specific  device  is  installed  in  peripheral  units,  with the main function of remote monitoring and control of all elements  in  the  system. 

The  monitoring  device  collects  all  relevant  information  about all circuits in the power electronics system, using its own sensors.   In   addition   to   energy   converters,   AC   and   DC   distribution,  all  available  energy  sources  are  monitored.  If  the  energy converters have microcomputers, the monitoring device also  accepts  these  data.  Data  collected  from  own  sensors,  together   with   data   obtained   from   the   microcomputer,   are   forwarded  to  the  monitoring  centers.  In  order  to  increase  the  reliability  of  data  transmission,  it  is  possible  to  connect  two  transmission  paths  that  are  used  depending  on  the  availability  in  a  telecommunication  object  (usually  one  wired  Ethernet  or  modem  and  wireless  -  GPRS).  There  is  only  one  computer  in  the  monitoring  center  that  receives  data  from  all  peripheral  devices, unpacks them and displays it on one monitor. Data are displayed  in  such  a  way  that  at  first  glance  can  be  determined  how many power systems with irregularities in operation exist.

Application  software  has  multiple  levels.  At  the  basic  level,  there  are  data  about  the  devices  in  the  alarm  state,  and  about  the  level  of  alarms.  At  the  second  level,  detailed  data  are  collected  from  peripheral  monitoring  devices. https://codeshoppy.com/php-projects-titles-topics.html At  the  second  level,  all  the  elements  of  the  power  supply  system  are  visible,  as well as the reason why the object is under the alarm. Data on the  first  and  second  levels  were  collected  from  the  developed  monitoring  device.  At  the  third  level,  data  are  collected  from  microcomputers,   integral   elements   of   energy   converters.  

At  the  basic  level,  all  regional  centers  are  visible.  The  occurrence  of  an  alarm  in  any  regional  center  will  change  the  color  of  the  circle  next  to  the  name  of  the  regional  center.  At  the  basic  level,  a  window  presenting  all  the  objects  that  are  being monitored and objects under alarm can be opened. In this example,  the  object  Drnić,  belonging  to  the  regional  center  of  Banja  Luka,  is  in  an  alarm  state.  The  blue  circle  indicates  the  object  for  which  the  collected  data  are  older  than  15  minutes,  or for which there was a communication break.
At the second level, the data from the monitoring device are visible.  The  input  voltages  in  the  object,  the  voltages,  and  currents of the alternate power supplies, the temperature of the object, as well as the voltages and currents at the output of the power  supply  system  are  measured.  The  occurrence  of  an  alarm,  besides  spotting  by  the  message  and  the  data  in  red  color,  also  includes  an  audio  alarm.  The  alarm  message  will  remain   on   the   screen   until   the   user   confirms   it.   After   confirming  the  alarm,  the  alarm  event  is  registered  into  the  alarm  base.

 At  any  moment,  the  user  can  access  the  database  and view all alarms and events for a defined time period.

At    the    third    level,    the    data    collected    from    the    microcomputer of energy converters are shown. In the example in  Figure  7,  the  data  generated  by  the  power  supply  system  SN12  are  presented.  The  graphical  application  corresponds  to  the display developed by the manufacturer of the power supply system. The downloaded data are transmitted to the user via the monitoring  system,  regardless  of  the  data  collected  by  the  measurement probes. Code Shoppy

The  frequency  of  the  data  collecting  from  a  monitoring  device  is  fifteen  minutes,  which  is  sufficient  to  prevent  the  occurrence of a phenomenon that could lead to an unregistered irregularity  of  the  power  system.  If  an  alarm  occurs,  the  monitoring system generates an alarm, regardless of the fifteen-minute call-over. In addition, after an incident, it is possible to analyze  the  behavior  of  each  element  in  the  system  before,  during  and  after  the  secondary  measurement  incident.  Such  measurements and analyses are important data for maintenance sectors,  because,  in  this  way,  they  can  organize  preventive  maintenance of the power system.