48 results about "Passivity controller" patented technology

The invention discloses a passive controller design method for a rectifier of an EMU, which includes establishing a mathematical model of a pulse rectifier on the network side of an EMU, further establishing its port-controlled Hamiltonian mathematical model with dissipation, and proving that the EMU The passivity of the grid-side pulse rectifier is determined, and the balance point of system stability is determined. Finally, the passive control idea based on interconnection and damping distribution is adopted to derive the passive controller based on the rectifier. The energy dissipation of the system is accelerated by injecting a new damping dissipation term, so that the new energy function reaches the minimum value at the system equilibrium point, so that there is no need to solve the partial differential equation to derive the controller based on IDA-PBC rectifier. The passive controller designed by the invention has strong dynamic and static performance, and provides a new idea for solving the problem of voltage overshoot of the DC link of the rectifier on the side of the train network.

The invention discloses an improved passive control method of a three-phase grid-connected inverter based on interference observer compensation, which relates to the technical field of grid-connectedinverters, comprising the following steps: (1) sampling the grid-connected current of the inverter and the PCC point voltage, and performing abc / dq conversion; (2) calculating d-axis and q-axis command values; (3) performing d-axis and q-axis current control by a current inner-loop passive controller; (4) obtaining the output voltage compensation value of the inverter by using an interference observer; (5) performing PWM driving pulse production. In this invention, the current tracking controller of grid-connected inverter is designed based on a passive control theory, the controller has strong robustness, fast dynamic response and simple design. The disturbance observer is used to compensate the output, which effectively suppresses the influence of uncertain factors such as parameter perturbation, unmodeled error and disturbance on the steady-state / dynamic response characteristics of the system, thus improving the robustness of the controller.

The invention relates to a passive control system and method for a five-level NPC type inverter. The system comprises a sensor collection unit, a coordinate transformation unit, an inverter output three-phase current setting unit, a passive controller and an SPWM modulation unit, wherein the sensor collection unit is used for collecting inverter output three-phase current and power grid three-phase voltage in real time; the coordinate transformation unit is used for converting the output three-phase current and the power grid three-phase voltage into components in a coordinate system of d andq correspondingly; the inverter output three-phase current setting unit is used for setting the reference values of the components of the inverter output three-phase current on d axis and q axis; thepassive controller is connected to the coordinate transformation unit and the inverter output three-phase current setting unit and is used for outputting an SPWM modulation signal; the SPWM modulationunit is used for carrying out SPWM modulation according to the SPWM modulation signal output by the passive controller and outputting the PWM pulse signal of a switching device in the five-level NPCtype inverter. Compared with the prior art, the dynamic and static stability of the system is improved, and the inverter output current harmonics are reduced.

The invention discloses a method for realizing a passive control law of a direct-current motor based on load observation. A load torque observer is used for detecting the armature current and rotating speed of a direct-current motor on line, so that a load torque estimated value under the current working condition is obtained and fed back to a passive controller of the direct-current motor. When a load changes, the passive controller is used for ensuring that the rotating speed is stabilized at an instruction value through a pulse width modulation converter by using an interconnection and damping distribution passive control method based on a port controlled consumption Hamilton model of a direct-current motor dragging system according to a real-time load estimated by the load torque observer. Aiming at the condition that a load torque is needed in realization of the passive control law of the direct-current motor, the observer is adopted for estimating the load torque in real time, so that the cost for using a torque sensor is reduced, meanwhile, the realization difficulty of the passive control law is lowered, and a new approach is provided for the realization of a robust controller of the direct-current motor based on the passive control law.