code: def getActorLimits(self):
          
          generators = [g for g in self.env.case.online_generators
                        if g.bus.type != REFERENCE]
          limits = []
          for g in generators:
              limits.append((g.p_min, g.p_max))
  
          logger.info("Actor limits: %s" % limits)
  
          return limits
docs: Returns a list of 2-tuples, e.g. [(-3.14, 3.14), (-0.001, 0.001)],
          one tuple per parameter, giving min and max for that parameter.