This article presents upgradation of existing grid-connected direct online-start water pumping system by integration of multifunction photovoltaic inverter. The multifunction photovoltaic inverter is operated using a voltage-oriented control such that it delivers the reactive power in addition to the real solar photovoltaic power to deal with practical issues like steady-state grid voltage variation and poor power factor on irrigation feeder. In the implemented voltage-oriented control, the adaptive modified second-order generalized integrator-based estimators are used to derive the grid voltage angle and the reactive component of the load current, which considerably reduces the requirement of the sensors. The methods to derive the different control system tuning parameters, i.e., second-order generalized integrator gains and proportional integral controller gains, are also described. A prototype is developed to investigate the performance of designed system. In the prototype, the control algorithm is implemented using a generic ARM Cortex-M4 microcontroller. Extensive experiments are performed, and the test results are presented to validate the system operations.

本文介绍了通过集成多功能光伏逆变器对现有并网直接在线启动水泵系统的升级。多功能光伏逆变器使用面向电压的控制进行操作，因此除了实际的太阳能光伏功率外，它还提供无功功率，以解决实际问题，例如稳态电网电压变化和灌溉馈线上的功率因数不佳。在已实现的面向电压的控制中，基于自适应修改的基于二阶广义积分器的估计器可得出电网电压角和负载电流的无功分量，从而大大减少了传感器的需求。推导不同控制系统调节参数的方法，即 还描述了二阶广义积分器增益和比例积分控制器增益。开发了一个原型来研究设计系统的性能。在原型中，控制算法是使用通用ARM Cortex-M4微控制器实现的。进行了广泛的实验，并给出了测试结果以验证系统操作。