A system and method for speed regulation of a VFD circuit via an anti-windup control scheme that provides consistent speed response with no overshoot is disclosed. A control system for operating the VFD circuit includes a feedback controller programmed to receive a speed of a motor operating responsive to an initial torque command and process the speed of the motor to generate a feedback controller output. A feedforward controller of the control system is programmed to process a speed reference to generate a feedforward controller output. A command module of the control system is programmed to determine a torque command based on the processed outputs of the feedback and feedforward controllers and operate the VFD circuit to control the motor according to the torque command.

A contact control device (100) includes a disturbance correction timing control unit (42) that selectively outputs a first reference speed signal indicating a first reference speed or a second reference speed signal indicating a second reference speed lower than the first reference speed. When a movable part (12) comes closer to a second component (B) beyond a first reference position between a fixed part (11) and the second component (B), the disturbance correction timing control unit (42) switches its output signal from the first reference speed signal to the second reference speed signal and switches a gain in proportional compensation from a first gain to a second gain lower than the first gain.

A predicted value shaping system is provided for calculating a highly accurate control value by shaping of a predicted value. A prediction governor for calculating a control value (v) for controlling a controlled object includes: a result value acquisition unit (22) that acquires a previous target value of the controlled object, that is, a result value (r(t−1)); a predicted value acquisition unit (21) that acquires a predicted value (r (t)) obtained by predicting the target value of the controlled object (12); and a control value calculation unit (23) that calculates a control value (v(t)) for controlling the controlled object (12) by applying the result value (r(t−1)) and the predicted value (r (t)) to a predicted value shaping algorithm (G) to correct the predicted value (r̂(t). The predicted value shaping algorithm (G) uses parameters of a control model (P) of the controlled object (12).

The invention lies in the field of current stabilisation in a power generation system comprising a plurality of elementary power groups connected in parallel. It relates to a control system for regulating the elementary power groups. According to the invention, the control system comprises a global current control system (510) and a plurality of local current control systems each associated with an elementary power source of the power generation system. The global current control system (510) comprises: .square-solid. a divider (511) arranged to deliver a fixed current set point I.sub.n_fix, .square-solid. correction unit (512) arranged to deliver a variable current set point I.sub.n_var and to take either a steady state or a transitory state, the variable current set point I.sub.n_var being determined as a function of a correction signal S.sub.corr in the transitory state, .square-solid. an adder (513) arranged to deliver a global current set point I.sub.n_glob as the sum of the fixed current set point I.sub.n_fix and the variable current set point I.sub.n_var, and .square-solid. a scenario management unit (514) arranged to detect when the state of at least one elementary power source (220.sub.1-220.sub.N) switches from an OFF-state to an ON-state, or vice versa, to determine the correction signal S.sub.corr and to trigger the transitory state of the correction unit for a predetermined transitory period τ.sub.trans when a change of state is detected.

The invention lies in the field of current stabilisation in a power generation system comprising a plurality of elementary power groups connected in parallel. It relates to a control system for regulating the elementary power groups. According to the invention, the control system comprises a global current control system (510) and a plurality of local current control systems each associated with an elementary power source of the power generation system. The global current control system (510) comprises: .square-solid. a divider (511) arranged to deliver a fixed current set point I.sub.n_fix, .square-solid. correction unit (512) arranged to deliver a variable current set point I.sub.n_var and to take either a steady state or a transitory state, the variable current set point I.sub.n_var being determined as a function of a correction signal S.sub.corr in the transitory state, .square-solid. an adder (513) arranged to deliver a global current set point I.sub.n_glob as the sum of the fixed current set point I.sub.n_fix and the variable current set point I.sub.n_var, and .square-solid. a scenario management unit (514) arranged to detect when the state of at least one elementary power source (220.sub.1-220.sub.N) switches from an OFF-state to an ON-state, or vice versa, to determine the correction signal S.sub.corr and to trigger the transitory state of the correction unit for a predetermined transitory period τ.sub.trans when a change of state is detected.

A method of collecting data in a field device includes receiving indications of variables for which data is collected, receiving indications of trigger events to trigger collection of data, receiving threshold values associated with each of the trigger events, monitoring the trigger events, and initiating data collection when at least one of the trigger events crosses one the threshold values associated with the corresponding trigger event. A method of tuning a PID controller in a field device includes setting a limited range for selecting a value for a control parameter of the PID controller, selecting the value of the control parameter, wherein the selected value is constrained to be within the limited range, transmitting the selected value to the field device, obtaining, from the field device, a measurement of a response of the field device to a setpoint change, and displaying the obtained response measurements to a user.

An object of the present invention is to realize a feedback control apparatus and an electrically driven power steering apparatus capable of safely continuing control operation even in the event of the occurrence of a soft error. A controller 202 of the present invention determines a d-axis target voltage Vd and a q-axis target voltage Vq, which are control values for controlling an output value of the electrically driven power steering apparatus on the basis of a d-axis error signal δId and a q-axis error signal δIq, which are input values. In this processing, in a period before the occurrence of the soft error, the controller 202 determines the d-axis target voltage Vd and the q-axis target voltage Vq by means of PID control that uses a current input value and a past input value. In a period after the occurrence of the soft error, the d-axis target voltage Vd and the q-axis target voltage Vq are determined by means of P control that uses a current input value but does not use a past input value. In a period after a lapse of the above period, the PID control is resumed.

The disclosure discloses a customized harmonic repetitive controller and a control method, and belongs to the field of repetitive controllers for industrial control. In the repetitive controller, a periodic signal generator formed by three time-delay modules and a positive feedforward gain module is taken as a whole to form a forward path, and an internal model of a periodic signal is constructed in the form of outputting positive feedback. Therefore, the structure of the repetitive controller conforms to a standard internal model construction method, the repetitive controller has an order expanding capability, the flexibility of the controller is greatly improved, the disturbance canceling speed of the controller is increased, and the repetitive controller is simple in structure and convenient to design. An h-order nk±m-order-harmonic repetitive controller (h≥2) obtained by further expansion covers various existing high-order repetitive controllers, and a unified form is provided to make the repetitive controller universal.

A dead time estimation device capable of accurately estimating a dead time in a control system is provided. A dead time estimation device 6 includes a dead time calculation section 64 configured to obtain a dead time L{circumflex over ( )}′1 with which an evaluation function J in Equation (1) is at minimum
[Equation 7]
J=∫|Ĝ/e.sup.−{circumflex over (L)}′.sup.1.sup.s−Ĝ′|df  (1)
where G{circumflex over ( )}/e.sup.−L∧′1s is a frequency characteristic of an element from which a dead time element is removed from a transfer function of a control target P and G{circumflex over ( )}′ is a transfer function not including the dead time element in the control target P.

A servo control method includes a step of adjusting a feedback gain used in feedback control of a controlled object, the feedback control being performed based on difference information between a target value concerning an instruction and a feedback signal from the controlled object, so that the controlled object is operated by following the instruction, and a step of adjusting a feedforward gain used in feedforward control of the controlled object after the adjustment of the feedback gain.