Patent ID: 7440807

Claim:
A control system comprising: a user's control system; a virtual power monitor system interconnected with said user's control system; a bidirectional connection effecting said interconnection between said user's control system and said virtual power monitor system; said user's control system including: a user's controlled object; and a user's control strategy unit which is connected to said user's controlled object and applies a user's control strategy unit input to control said user's controlled object; and said virtual power monitor system including: a conservative control strategy unit which is connected to said user's controlled object and controls said user's controlled object conservatively though said bidirectional connection to effect a stable control; said bidirectional connection being configured to effect: connection of a user's controlled object output from said user's controlled object to said conservative control strategy; and a variable connection of a conservative control strategy unit input from said conservative control strategy unit to said user's controlled object such that said an amount of said conservative control strategy unit input applied to said user's controlled object is variable; a virtual power monitor which monitors a virtual power transmitted from said conservative control strategy unit to said user's controlled system by monitoring said bidirectional connection and calculating said virtual power as a scalar product of said user's controlled object output and said conservative control strategy unit input for said user's controlled object which is output from said conservative control strategy unit into said bidirectional connection, and such that said virtual power monitor system evaluates and analyzes stability of said user's controlled object output from said user's controlled object based on said calculating of said virtual power; said bidirectional connection varying said variable connection based on said virtual power calculated by said virtual power monitor; and a virtual power limiter controlling said variable connection and connected between said user's control strategy unit and said user's controlled object, and configured to tune a gain of said user's control strategy unit input applied to said user's controlled object based upon said virtual power monitored by said virtual power monitor, such that: said virtual power limiter tunes said gain automatically, said virtual power limiter limits the outflow of said virtual power from said user's controlled system to said conservative control strategy unit, and said virtual power limiter maintains stability of said user's controlled object output from said user's controlled object.