Design of the Reference Signal Generation Module in Standard Power Source

Nowadays, the operating power system has a characteristic called High-RE-PE, which represents “high proportion of renewable energy access” and “high proportion of power electronic equipment application”. The characteristic increases the content and frequency of harmonics in the power grid, which poses a challenge to the measurement accuracy of traditional electricity measurement equipment. Due to the High-RE-PE of the power system, it’s necessary to use a wideband and high-precision standard power source to calibrate electricity measurement equipment. A typical standard power source usually consists of a reference signal generation module, a power amplification module and a sampling feedback module. The reference signal generation module is designed in this paper, including the scheme of the reference signal generation module, selection of digital to analog converter (DAC), design of the filter circuit and design of the basic program. Theoretically, the designed reference signal generation module can output fundamental wave with amplitude error less than 0.2%, and the amplitude error of high-order harmonics is less than 2%. The simulation result shows that the designed filter circuit meets the requirements of the standard power source, the amplitude error of the filter’s output less than 0.2% under various temperature conditions.