Description: The use of solar energy as a source for pumping water is one of the promising areas in the photovoltaic (PV) application. The energy of photovoltaic pumping systems (PVPS) can be widely improved by employing an MPPT algorithm. This will lead consequently to maximize the electrical motor speed of the system. This paper presents a modified incremental conductance (IncCond) MPPT algorithm with direct control method applied to a standalone PV pumping system. The influence of the algorithm parameters on system behavior is investigated and compared with the traditional (INC) method. The studied system consists of a PV panel, a DC-DC boost converter, and a PMDC motor-pump. The simulation of the system by MATLAB-SIMULINK is carried out. Simulation results found are satisfactory.-The use of solar energy as a source for pumping water is one of the promising areas in the photovoltaic (PV) application. The energy of photovoltaic pumping systems (PVPS) can be widely improved by employing an MPPT algorithm. This will lead consequently to maximize the electrical motor speed of the system. This paper presents a modified incremental conductance (IncCond) MPPT algorithm with direct control method applied to a standalone PV pumping system. The influence of the algorithm parameters on system behavior is investigated and compared with the traditional (INC) method. The studied system consists of a PV panel, a DC-DC boost converter, and a PMDC motor-pump. The simulation of the system by MATLAB-SIMULINK is carried out. Simulation results found are satisfactory. Platform: |
Size: 1029120 |
Author:zakary |
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Description: 异步电机直接转矩控制系统仿真：
模型整体结构分为三大部分：主电路部分（直流电源、逆变器、电机）、控制系统部分（采用的是直接转矩控制，所以主要有坐标变换模块，灰色部分，磁链观测器模块，红色部分，直接转矩开关表选择模块，蓝色部分，以及外环的转速调节器ASR）剩下的就是仿真结果波形观测部分（观测信号依次向下为定子ab相线电压、三相定子电流、电机转速、电机电磁转矩）
运行初始条件为以1420r./min的额定转速电机空载启动，在0.3s时刻突加额定负载50牛米。在0.5s时刻电机转速突然下降为1200r/min。整个动态过程既可以分析稳态运行波形，又可以分析负载扰动情况下的动态响应和转速扰动情况下的动态响应。(Simulation of induction motor direct torque control system:
Model of the whole structure is divided into three parts: the main circuit part (DC power supply, inverter, motor control system (part), using the direct torque control, so the main coordinate transformation module, flux observer module, gray, red, direct torque switch table selection module, the blue part, and the outer ring of speed regulator ASR) the rest of the results observed (the observation signals are down for the AB phase stator voltage, three-phase stator current, motor speed, motor electromagnetic torque)
The initial conditions for the operation to start the motor no-load rated speed 1420r./min, 50 nm in 0.3s moment of sudden rated load. At 0.5s, the motor speed drops suddenly to 1200r/min. The whole dynamic process can not only analyze the steady state operation waveform, but also analyze the dynamic response under load disturbance and the dynamic response under the condition of speed disturbance.) Platform: |
Size: 30720 |
Author:rogermilk
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Description: 本设计为一种温控风扇系统，具有灵敏的温度感测和显示功能，系统采用51系列单片机AT89C51 单片机作为控制平台对风扇转速进行控制。利用DS18B20数字温度传感器采集实时温度，经单片机处理后通过三极管驱动直流风扇的电机。根据采集的实时温度，实现了风扇的自起自停.可由用户设置高、低温度值，测得温度值在高低温度之间时打开风扇弱风档，当温度升高超过所设定的温度时自动切换到大风档，当温度小于所设定的温度时自动关闭风扇，控制状态随外界温度而定。(This design is a temperature control fan system with sensitive temperature sensing and display function. The system uses 51 series single chip AT89C51 as the control platform to control the fan speed. DS18B20 digital temperature sensor is used to collect real-time temperature, and the motor of DC fan is driven by triode after being processed by MCU. According to the collected real-time temperature, the fan can start and stop automatically. The user can set the high and low temperature values. The measured temperature values between high and low temperatures can open the weak fan gear. When the temperature rises above the set temperature, the fan can be automatically switched to the big fan gear. When the temperature is lower than the set temperature, the fan can be automatically closed. The control state depends on the external temperature.) Platform: |
Size: 29696 |
Author:lllsq |
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Search - speed control dc motor