Along with massive applications of power electronic equipment and non-linear loads, harmonic pollutions are becoming more serious than ever. This paper describes a novel electromagnetic coupling reactor based passive power filter with dynamic tuning to quickly eliminate harmony. Firstly, the structure and mathematic model of electromagnetic coupling reactor are presented; secondly, the employed parameters, including electromagnetic coupling reactance converter, primary winding coil, and secondary winding coil are designed based on a stable structure of data; then, the test plat of passive dynamic tunable filter is introduced, as well as the performance test. According to the experimental results, the newly designed electromagnetic coupling reactor can effectively eliminate the harmonies generated by the nonlinear load, greatly reducing the harm caused by harmonics on the grid. By fine-tuning the electromagnetic coupling reactor, the dissonance caused by the change of capacitance and other issues can be effectively solved. Finally, the detailed discussion of this paper is presented, and challenges and new future research are discussed.

Power electronics-based apparatuses absorb non-sinusoidal currents. These are considered non-linear and non-symmetrical loads for the power grid, and they generate a harmonic current. The dynamic tuning passive filter (DTPF) is one of the best solutions for improving power quality and filtering out harmonic currents to get a symmetrical current waveform. The electrical parameters of DTPF can influence its absorbing harmonic current, tuning performance, and cost. In this paper, a method for designing and optimizing the electrical parameters of dynamic tuning passive filter is proposed in order to improve the effectiveness of DTPF and the symmetry level of the power source. First, according to the characteristics of the harmonic source, the design technical indicators of DTPF, and its topology, the design procedure for the electrical parameters of DTPF is proposed. Second, based on detailed analysis of the test results, the range of the harmonic current absorption coefficient is determined. Third, the range of the relationship coefficient is determined by analyzing the impact of the filter capacitor’s capacity on the filter performance. Fourth, the calculation method for the electrical parameters of DTPF is devised. Finally, the validity of this method is verified by several engineering cases, and the electrical parameters of the filter capacitor and electromagnetic coupling reactance converter (ECRC) under the lowest total cost are simulated and optimized. Our approach can optimize the electrical parameters of DTPF and improve the harmonic suppression effectiveness, thus leading to a more symmetrical waveform and successfully avoiding power grid problems. The research results of this study not only provide a basis for the design of ECRC, but also lay a foundation for the machining DTPF.

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In the power system, the reactive power causes low power factor and power loss. The reactive power compensation device can ensure normal and stable operation of the power system. The traditional reactive power compensation device is difficult to meet the needs of high power factor and low power loss. Therefore, a dynamic reactive power compensation device has been presented by authors to achieve high power factor and low power loss. Based on the previous research results, the dynamic reactive power compensation device based on variable reactance converter is simulated. The following works have been done in the study: topology of dynamic reactive power compensation device, simulation model of dynamic reactive power compensation device, and simulation. The simulation results show that the dynamic reactive power compensation device based on variable reactance converter improves the power factor of power system and saves energy. The research of this paper has laid a theoretical foundation for the dynamic reactive power compensation device in practical applications.

Abstract. The use of non-linear and time-varying electronic devices, such as rectifiers and inverters, makes the current waveform of the grid seriously distorted. The harmonics generated by those devices have bad effects on the generation and transmission of electric energy. To deal with these problems, a novel passive dynamic filtering method is proposed in this paper. The method is based on the passive filter techniques proposed in 1950s. And it combines the conventional passive filtering techniques with modern computer technologies. When this method is applied in the electrical system, the harmonics can significantly be decreased. The following works have been done in the study: topology of the passive dynamic filter; principle of the passive dynamic filtering method; control system of the passive dynamic filter; implementation of the passive dynamic filtering method.

In power system, a large number of the inductive loads need the reactive power. These loads always make dramatic voltage fluctuation in power system. The traditional static reactive power compensator is difficult to meet the needs of the adjustable reactive power capacity .Therefore, a dynamic reactive power compensation method of the inductance converter based on IGBT is proposed in this paper. The following works have been done in the study: research of the inductance converter based on IGBT, modeling and simulation with MATLAB/SIMULINK, and its application in a dynamic reactive power compensation device. The hardware and software designs are realized in this paper, and it is subsequently verified experimentally. Experimental results show that inductance converter based on IGBT can be applied effectively in dynamic reactive power compensation.

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