An Analog Control Strategy with Multiplier-less Power Calculation Circuit for Flyback Micro-inverter

2021 ◽  
pp. 1-1
Author(s):  
Min GAE Chen ◽  
Ruirui Zheng ◽  
Yutai Fu ◽  
Jizhi Qi ◽  
Fang Han ◽  
...  
Keyword(s):  
Control Strategy ◽  
Power Calculation ◽  
Analog Control ◽  
Micro Inverter

scholarly journals Design and digital implementation of power control strategy for grid connected photovoltaic inverter

2019 ◽  
Vol 10 (3) ◽  
pp. 1564 ◽  
Author(s):  
Linda Hassaine ◽  
Mohamed Rida Bengourina
Keyword(s):  
Phase Shift ◽  
Power Control ◽  
Control Strategy ◽  
Digital Control ◽  
Optimization Design ◽  
Power Calculation ◽  
Digital Implementation ◽  
Grid Voltage ◽  
Phase Shift Angle ◽  
Shift Angle

<p class="Abstract">This paper presents the optimization design and a detailed implementation in FPGA (Field-Programmable Gate Array) of a power control strategy. This strategy is based on the phase shift angle of the inverter output voltage with respect to the grid voltage and DSPWM (Digital Sinusoidal Pulse Width Modulation) patterns “Phase shift angle-DSPWM” for an inverter for photovoltaic system connected to the grid. The proposed control can synchronize a sinusoidal inverter output current with a grid voltage and control the power injected into the grid. Detailed development of a digital controller with lower hardware and computation requirement is proposed. Description on the digital implementation of the A/D converter, the PI compensator, the phase shift and the DPWM, is provided. This digital control exhibit simplicity, reduction of the memory requirements and power calculation for the control. The functional structure of this system with digital control has been validated with simulations and experimental results.</p>

Photovoltaic Grid-Connected Micro-Inverter Based on Self-Tuning Fuzzy-PI Controller

2014 ◽  
Vol 986-987 ◽  
pp. 1098-1102 ◽  
Author(s):  
Chang Liang Liu ◽  
Hui Chao Zhang
Keyword(s):  
Control Strategy ◽  
Fuzzy Controller ◽  
Tracking Error ◽  
Pi Controller ◽  
Matlab Simulation ◽  
Highly Nonlinear ◽  
Self Tuning ◽  
Fuzzy Pi Controller ◽  
Pv Grid ◽  
Micro Inverter

This paper introduces a kind of grid-connected micro-inverter system. Photovoltaic micro-inverter system is a highly nonlinear and time-varying system. Compared to traditional linear control strategy, Fuzzy Controller has better robustness and stability in the changing or non-linear application. Matlab simulation model for current tracking PV Grid-connected Micro-inverter was completed based on the Fuzzy self-tuning PI controller and the control strategy was tested on the micro-inverter prototype. The resu1ts show that this control strategy can effectively reduce the tracking error of the net current, and improve the system’s dynamic response.

scholarly journals Improved PR Control Strategy for an LCL Three-Phase Grid-Connected Inverter Based on Active Damping

2021 ◽  
Vol 11 (7) ◽  
pp. 3170
Author(s):  
Yahui Li ◽  
Jing Zhang ◽  
Zhenghang Hao ◽  
Peng Tian
Keyword(s):  
Coordinate System ◽  
Control Strategy ◽  
Reactive Power ◽  
Current Control ◽  
Active Damping ◽  
Power Calculation ◽  
Frequency Method ◽  
Proportional Integral ◽  
Three Phase ◽  
Grid Connected Inverter

Aiming at the problem of power coupling and complicated decoupling in the d-q coordinate system of a three-phase grid-connected inverter, a current closed-loop control strategy based on an improved QPIR (quasi-proportional integral resonant) controller in the α-β two-phase static coordinate system is proposed. Firstly, the mathematical model of an LCL three-phase grid-connected inverter is established, and its instantaneous power calculation equation is deduced. Secondly, the frequency method is applied to compare and analyze the proportional resonant, quasi-proportional resonant, and improved current controller, and the appropriate improved controller parameters are obtained according to the traditional proportional integral controller parameter design method and the weight coefficient. Finally, the improved controller is compared with the traditional controller in the simulation model of the LCL three-phase grid-connected inverter based on active damping. The results show that the proposed improved current control strategy has good dynamic response characteristics, can realize the non-static error control of grid-connected current, and realizes the decoupling control of active power and reactive power when the load jumps. At the same time, the results also prove the superiority of the proposed control strategy and verify its effectiveness.

scholarly journals An Efficient Grid-tied Flyback Micro-inverter with DCM Control Strategy

2021 ◽  
Vol 3 (1) ◽  
pp. 74-84
Author(s):  
Salam Jabr Yaqoob ◽  
Adel A. Obed
Keyword(s):  
Control Strategy ◽  
Pulse Width Modulation ◽  
High Reliability ◽  
Low Cost ◽  
Harmonic Distortion ◽  
Weather Conditions ◽  
Single Stage ◽  
Point Tracking ◽  
Pv Module ◽  
Micro Inverter

In two-stage micro-inverter photovoltaic (PV) applications, DC/DC converter is used to obtain the highest DC power from the PV module. In this type of inverter, the rising of voltage from the PV module to a grid voltage level is limited to a certain value. Moreover, the absence of the isolation between the input and output makes it is less efficient. For these reasons, an efficient single-stage grid-tied flyback PV micro-inverter with discontinuous conduction mode (DCM) control strategy is proposed to feed an alternating current (AC) to the main grid with a lower value of the total harmonic distortion (THD). The control strategy is based on a sine sinusoidal pulse width modulation (SPWM) technique to control the main switch of flyback inverter. Also, a simple perturb and observe (P&O) maximum power point tracking (MPPT) technique has been presented to obtain the MPP point from the PV module for any environmental conditions. The proposed control was verified using PSIM software and simulation results is obtained. The proposed control is tested under different weather conditions for solar irradiance and temperature, as a result, a pure sin wave current has been injected into the grid with a lower harmonics value. Finally, the small size, low cost and high reliability of single stage flyback micro-inverter is presented without the need for DC/DC converter.

Research on the Stability Affected by Digital Process of SPWM Inverter

2011 ◽  
Vol 347-353 ◽  
pp. 564-567
Author(s):  
Hong Tao Shan ◽  
Yong Kang ◽  
Xue Juan Kong ◽  
Yu Zhang
Keyword(s):  
Control Strategy ◽  
Pid Control ◽  
Digital Control ◽  
Control Process ◽  
Zero Order ◽  
Main Stream ◽  
Analog Control ◽  
Delay Control ◽  
One Step ◽  
The Stability

Digital controlled SPWM inverter has become main-stream in development of SPWM inverter control strategy. But the traditional PID control strategy realized in digital control can’t achieve better performance than in analog control. Process of the zero-order hold & one-step-delay control were researched the effect of zero-order hold & one-step-delay control on the stability of digital control SPWM inverter with quantitative analysis in this paper. Finally relevant simulations and experiments were verified the validity of the theoretical analysis.

Design of Intelligent Control of DC Motor

2013 ◽  
Vol 313-314 ◽  
pp. 427-431 ◽  
Author(s):  
Gao Jian Li
Keyword(s):  
Intelligent Control ◽  
Software Design ◽  
Control Strategy ◽  
Motor System ◽  
Electrical Energy ◽  
Dc Motor ◽  
Inrush Current ◽  
Protection Measures ◽  
Analog Control ◽  
Optical Isolators

This paper introduces a DSP-based intelligent control of DC motor system, describes the intelligent control strategy of the DC motor, optical isolators driving ,related protection measures and the hardware and software design. The experimental results show that the control system can reduce the transient process such as over-voltage, inrush current of the switching operation etc. Comparing with the existing analog control circuit, its structure is simple, easy to operate and can improve electrical energy quality.

scholarly journals Free Switching Control Strategy for Multi-Operation Modes of Multi-Port Energy Router in Distribution Area

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7860
Author(s):  
Shumei Chi ◽  
Zhipeng Lv ◽  
Lan Liu ◽  
Yang Shan
Keyword(s):  
Control Strategy ◽  
Power Supply ◽  
Operation Mode ◽  
Switching Control ◽  
Mode Switching ◽  
Distribution Area ◽  
Power Calculation ◽  
Operation Modes ◽  
New Energy ◽  
Switching Control Strategy

For the distribution area with a high penetration rate of new energy, the traditional power supply system has some problems, such as a single form of power supply and low utilization of new energy. Because the multi-port energy router can realize the interconnection and complementation of multiple energy forms, it has become the key piece of equipment in the hybrid AC/DC distribution area. Nevertheless, restricted by the existing control strategy, the performance of the energy router in complex operation mode switching and coordinated control still needs to be further improved. To address this issue, the free switching control strategy is proposed in this paper. Firstly, the topology and model of the multi-port energy router are designed and established. Secondly, the operation mode of the system is analyzed, and the control strategy of each port is designed. Then, a reference power calculation method suitable for multi-mode operation is derived. Based on this, the control strategy does not need to be changed when operation modes are switched. Furthermore, the extended state observer is introduced to track and compensate for the new energy disturbance, which can improve the power quality of the system. Finally, the simulation and experimental results show that the proposed control strategy of the multi-port energy router can realize flexible and controllable power transmission among various modules in the distribution area and the free switching of multi-operation modes without changing the control strategy.

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