50 results about "Multi loop control" patented technology

The invention relates to a fluctuation source localization method of multi-loop oscillation of a novel process industry. According to the method, a frequency domain independent component analysis (ICA) is employed to carry out independent component decomposition on industry historical process data; a variable quantity that plays a leading role in fluctuation oscillation and a dominant frequency can be screened; a local directed coherence analysis is carried out on the screened data; and a cause-and-effect relationship graph is used to visually express a cause-and-effect relationship between loop variables, so that a propagation path of a fluctuation interference can be characterized; process priori knowledge is used to simplify the cause-and-effect relationship graph as well as a threshold automatic searching mode is utilized to filter a secondary cause-and-effect relationship branch, so that a main propagation path of fluctuation is obtained and thus a fluctuation source is localized and identified. Compared with the prior art, the technology employed in the invention enables the method to have the following beneficial effects: a signal analysis on a frequency domain is utilized to reveal an essential attribute of oscillation of a multi-loop control system, so that a fluctuation source of the oscillation is determined; and thus, it is beneficial for a factory engineer to carry out follow-up maintenance and repairing work of a fault circuit.

The invention discloses a microgrid inverter multi-loop control method based on a virtual synchronous generator, and the method comprises power control of an outer loop and voltage current control of an inner loop. The power control of the outer loop comprises the following steps: measuring the three-phase voltage and current of an output side of an inverter, calculating active power and reactive power according to the instantaneous power theory, carrying out calculation and regulation through an active power-frequency equation, a reactive frequency equation, a torque inertia equation and an electromagnetic transient equation of a synchronous motor, obtaining the amplitude of an output voltage and a phase angle given value, and then carrying out modulation through voltage and current double loops. The method can achieve the non-corresponding control of voltage size and frequency well, outputs active and reactive power, can achieve precise manual control, and has the characteristics of V / F and PQ control. When a fault happens to a power grid, the method can simulate the primary modulation, primary voltage regulation and inertia characteristics of the synchronous generator, participates in the power grid adjustment, provides frequency and voltage support, and facilitates the stabilization of the power grid.

The invention discloses a thermal multi-loop controller closed-loop iterative tuning system and tuning method based on particle swarm calculation. In the invention, the iterative tuning control unit calls the closed-loop identification model unit to identify historical data from the field control system. And input the obtained ARX model order and parameter values ​​into the control loop simulation unit, and then call the closed-loop particle swarm optimization unit to initialize the parameters of the controller to be tuned, and keep the original parameters of the other controllers, and the closed-loop particle swarm optimization unit calls the control loop simulation unit to Each controller to be tuned is closed-loop tuned one by one, and iteratively tuned several times, and the parameters of each controller to be tuned are optimized as the output result of the closed-loop iterative particle swarm tuning system, and the result is output to the field control system. The invention realizes the closed-loop optimal setting of the thermal multi-loop controller parameters, thereby guiding the online adjustment of the controller parameters without affecting the production, and effectively improving the adjustment quality of the control system.

A multi-loop controller component for an electric discharge machining (EDM) system includes a plurality of power loop circuits coupled to an output of a power supply of the EDM system and configured to receive DC electric power from the power supply. Each power loop circuits electrically-isolated from other power loop circuits. The multi-loop controller component also includes a plurality of transistors. Each transistor is coupled to a respective power loop circuit and is configured to switch between an ON state and an OFF state to generate a pulse of the DC electric power through the respective power loop circuit. In addition, the multi-loop controller component has a drive controller coupled to the plurality of transistors. The drive controller is configured to transmit at least one control signal to at least one of the transistors to facilitate switching the transistor between the ON state and the OFF state.

The invention discloses a control loop design method based on the cut-off frequency. The control loop design method is suitable for single-loop or multi-loop control loop design adopting forward series proportional control or integral control or proportional-integral control. According to the control loop design method, other control links except a forward access controller are equated to be generalized controlled objects, according to the rapidity requirement of a control system, the cut-off frequency is determined, and based on the cut-off frequency and the generalized controlled objects, controller parameters are quantificationally calculated and determined; and theoretical analysis and simulation verification indicate that a designed control loop meets rapidity design indexes and has the great control quality.