FPGA Based Hardware Controller Research Articles

Deadbeat Control with Disturbance Compensation Method and 1 MHz‐PLL for Single Phase Utility Interactive Inverter

SUMMARYIn the near future, many distributed power systems will be connected to utility lines in the local area. The demand for control accuracy of utility interactive inverters will likely increase beyond present capabilities. The utility interactive inverter requires FRT capability to compensate for utility voltage fluctuations. A deadbeat control with disturbance compensation and 1 MHz‐PLL control with quasi‐dq transformation were applied to a utility interactive inverter using an FPGA based hardware controller. The FRT characteristics were verified through simulations and experiments, and the superior characteristics of the proposed method were verified.

A design of bilateral teleoperation systems using composite adaptive controller

This paper presents a synchronization scheme of bilateral teleoperation systems using composite adaptive controller. To design a controller for bilateral teleoperation systems, all the parameters of the master and the slave robots need to be known. However, there exist parameter uncertainties in the robot manipulators. A composite adaptive controller is designed for convergence of states and parameters of the master and the slave robots in the presence of parameter uncertainties. Consequently, position and force tracking problems in free and contact motion are solved in a synchronized manner. Through a number of simulations, the superiority of the proposed method over existing works is illustrated. Furthermore, for the validation of utility of the proposed method in an actual embedded system, the algorithms are implemented and tested in FPGA-based hardware controller.

Multirate Deadbeat Control for 100kHz Single Phase Utility Interactive Inverter with FPGA Based Hardware Controller

A current control method for the utility interactive inverter based on multi-rate deadbeat control method with FPGA based hardware controller is verified for 100kHz carrier PWM inverter. As the distributed power systems spread, the requirement of the control accuracy for the utility interactive inverter becomes more precise. Deadbeat control is one method to ensure the output voltage or current matches to the references at the sampling instant, so adopting this control law to the utility interactive inverter, the response of the system is much improved with small LC filter component compared with the conventional PI control. A current control method for the utility interactive inverter based on multi-rate deadbeat control, single-rate deadbeat control and PI control were compared. Multi-rate deadbeat control improves the tracking accuracy to the reference compared with the conventional single-rate deadbeat control and PI control. The advantages and disadvantages are discussed through simulations and experiments.

Current Control for Utility Interactive Inverter Using Multisampling Method Based on FPGA

In this paper, a new control method is proposed for the utility interactive inverter based on the deadbeat control with the FPGA-based hardware controller to improve the control response of an utility current.Deadbeat control is one method to ensure the output voltage or current matches with the references at the sampling instant; therefore, by adopting this control law to the utility interactive inverter, the response of the system is much improved compared with the conventional PI control. The utility interactive inverter is linked to the commercial source via the interactive inductor, and so the inverter controls the output voltage based on the deadbeat control to regulate the output current through the interactive inductor. As a result, a very fast transient response of the utility current can be achieved.The current control method using voltage deadbeat control and PLL control with quasi dq transformation with multisampling parallel processing method are implemented in the FPGA-based hardware controller for the single phase utility interactive inverter.

High-speed Single-Phase PLL Control by Quasi dq Transformation Using FPGA

In this paper, we propose a high-speed frequency detection method for a single phase utility interactive inverter. Distributed power systems are considered to be a solution to environmental problems. As the use of distributed power systems spreads, the stability and reliability of utility interactive systems become important. In a utility interactive system, it is necessary to synchronize an internal phase of controller to a utility voltage. In the case of a single phase system, it is difficult to detect the instantaneous phase angle of the utility voltage.In this paper, we describe a new high-speed frequency detection method. In this method, a quasi dq transformation is applied by using an FPGA-based hardware controller. The quasi dq transformation is applied to develop PLL control. In this PLL control method, multiple samples can be processed in parallel by adopting an FPGA implementation. The hardware implementations are demonstrated by performing simulations and experiments.

FPGAによるハードウェアコントローラを用いたPWMインバータのマルチレートデッドビート制御

FPGAによるハードウェアコントローラを用いたPWMインバータのマルチレートデッドビート制御