Mochuan Drives - Professional design, manufacturer HMI Touch Screen Panel & PLC Controller, provide industry solutions and system integration since 2009.

  • Professional design, manufacturer HMI Touch Screen Panel & PLC Controller, provide industry solutions and system integration since 2009.


Innovative Approaches to Harmonic Mitigation in Switching Power Supplies with PLC Technology



As our reliance on electronic devices continues to grow, so does the demand for power supplies that can efficiently handle the high-frequency switching systems found in modern electronics. However, one of the challenges associated with switching power supplies is the production of harmonics, which can cause detrimental effects on the power delivery network. In this article, we will explore innovative approaches to harmonic mitigation in switching power supplies, with a particular focus on the use of Programmable Logic Controllers (PLCs). Through the implementation of advanced control algorithms, PLC technology offers a promising solution to minimize harmonics and improve the overall efficiency of power supplies.

The Significance of Harmonic Mitigation

Harmonics are currents or voltages that have frequencies that are integer multiples of the fundamental frequency of the power system. These harmonic components can lead to a range of issues, including increased power losses, reduced power factor, and electromagnetic interference. The introduction of harmonics can also negatively impact other connected devices, causing malfunctions or premature failure. Therefore, it is vital to address harmonic distortion to ensure the stability and reliability of power supplies.

The Role of Switching Power Supplies in Harmonic Generation

Switching power supplies are widely used in various applications due to their high efficiency and compact size. However, the rapid switching action of these devices brings about inherent challenges in terms of harmonics. The non-linear characteristics of the switching devices, such as diodes and transistors, contribute to the generation of harmonics in the output voltage and current waveforms. The harmonic content in the power supply output can greatly exceed regulatory limits, leading to non-compliance issues and potential damage to connected equipment.

Traditional Harmonic Mitigation Techniques

Traditionally, passive filters and harmonic traps have been employed to mitigate harmonics in power systems. Passive filters consist of capacitors, inductors, and resistors, and are designed to attenuate specific harmonic frequencies. These filters are effective but have limitations in terms of their bulky size, high manufacturing cost, and the risk of resonance problems. Harmonic traps, on the other hand, utilize tuned resonance circuits to redirect or absorb harmonic currents. While these techniques work well in certain scenarios, they may not be suitable for all applications due to their limited flexibility and scalability.

The Promise of PLC Technology in Harmonic Mitigation

The integration of PLC technology opens up new opportunities for effective harmonic mitigation in switching power supplies. PLCs are advanced control systems that can execute complex algorithms in real-time, making them well-suited for handling the dynamic nature of power electronics. By implementing intelligent control strategies, PLCs can actively minimize harmonics through adaptive compensation techniques.

Advanced Control Algorithms for Harmonic Mitigation

PLC-based harmonic mitigation systems employ sophisticated control algorithms to ensure accurate compensation for harmonic currents. One such algorithm is the model predictive control (MPC), which utilizes a mathematical model of the power supply system to predict the future behavior of harmonics. Using this predictive model, the MPC algorithm can anticipate harmonic disturbances and take preemptive measures to counteract them, resulting in enhanced suppression of harmonics.

Another commonly used control algorithm is the proportional-integral-derivative (PID) controller. The PID controller adjusts the system's output based on the error between the desired and actual values, aiming to minimize the harmonic content. By continuously monitoring the output waveform and adjusting the compensation parameters, the PID controller can dynamically mitigate harmonics and maintain optimal performance.

Implementation Challenges and Considerations

While PLC technology offers substantial benefits in harmonic mitigation, its successful implementation requires careful considerations. Firstly, the selection of appropriate sensors and measurement techniques is crucial for accurate detection and monitoring of harmonic frequencies. High-quality sensors capable of capturing fast-changing waveforms are necessary to provide reliable data for the control algorithms.

Furthermore, the computational capabilities of the PLC must be taken into account. As the complexity of the control algorithms increases, so does the computational load on the PLC. Ensuring that the chosen PLC has adequate processing power and memory capacity is essential to maintain real-time performance and optimize harmonic mitigation performance.


In conclusion, harmonic mitigation is a critical aspect of modern power supplies and is necessary to ensure the stability and efficiency of the power delivery network. With the integration of PLC technology and advanced control algorithms, innovative approaches to address harmonic distortion in switching power supplies have emerged. Through real-time monitoring, predictive models, and adaptive compensation techniques, PLCs offer an effective solution to minimize harmonics and enhance the reliability of power systems. As the demand for more efficient and clean power supplies continues to grow, the utilization of PLC technology in harmonic mitigation is poised to play a significant role in shaping the future of power electronics.


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