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Adjusting a control system in order to improve its performance might lead to unexpected behaviour (e.g., poor stability or even instability by increasing the gain value). In order to make the system behave as desired, it is necessary to redesign the system and add a compensator, a device which compensates for the deficient performance of the ...
In analog control, the control signal is typically an electrical voltage or current (although other signals such as hydraulic pressure can be used). In this case a lead-lag compensator will consist of a network of operational amplifiers ("op-amps") connected as integrators and weighted adders. A possible physical realization of a lead-lag ...
Compensating controls are internal controls that are intended to reduce the risk of an existing or potential control weakness. If a single person can carry out and conceal errors and/or irregularities in the course of performing their day-to-day activities, they have been assigned SoD incompatible duties. There are several control mechanisms ...
Detective controls are intended to identify, characterize, and log an incident e.g. isolating suspicious behavior from a malicious actor on a network; [2] Compensating controls mitigate ongoing damages of an active incident, e.g. shutting down a system upon detecting malware.
Tuning a control loop is the adjustment of its control parameters (proportional band/gain, integral gain/reset, derivative gain/rate) to the optimum values for the desired control response. Stability (no unbounded oscillation) is a basic requirement, but beyond that, different systems have different behavior, different applications have ...
The definition of a closed loop control system according to the British Standards Institution is "a control system possessing monitoring feedback, the deviation signal formed as a result of this feedback being used to control the action of a final control element in such a way as to tend to reduce the deviation to zero."
Since a STATCOM varies its voltage magnitude to control reactive power, the topology of how the VSC is designed and connected defines how effectively and quickly it can operate. There are numerous different topologies available for VSCs and power electronic based converters, the most common ones are covered below.
A basic closed loop control system, using unity negative feedback. C(s) and G(s) denote compensator and plant transfer functions, respectively. Let () and () denote the plant and controller's transfer function in a basic closed loop control system written in the Laplace domain using unity negative feedback.