International Journal of Research in Engineering, Science and Management Volume-2, Issue-11, November-2019 www.ijresm.com | ISSN (Online): 2581-5792 271 Abstract: The loss of dignity in power quality causes various effects on utilities side and customer side. Voltage harmonic and current harmonics are power quality issue. This paper suggests a series active filter with a simple control technique. The series active filter decreases the terminal harmonic voltages, supplying linear or even nonlinear loads with a good quality voltage waveform. The control strategy plays vital role to improve the performance of a hybrid series active power filter (HSAPF). This paper presents the MATLAB simulation of hybrid series active power filter to lower the harmonics and improve the power quality. Keywords: Shunt passive filter, series active filter, power quality, Harmonics, Hybrid series active power filter (HSAPF) 1. Introduction Due to the development in the technology also the development in the smart grid, consumers demand is increases so there is a necessity of improved power quality. with the rapid increase in the non-linear load it is difficult to achieve improved power quality. Non – linear loads draw harmonic current from the utility and due to that harmonic voltage is generated. Harmonic distortion can cause problem in power distribution side and consumers side. Voltage distortion, caused by non- linear loads, failing of equipments, overheating, ageing and poverty of the performance of equipment etc., is a common phenomenon in electrical power system [1]. A inaccurate load voltage causes harmonic currents to flow at the distribution side of three phase power supply system. This harmonic components, existent at the load side, may overheat the distribution transformers at below than nominal load and thus obstruct power distribution. The traditional method for compensate the harmonic current is to used the passive filter [2]. When passive filter is connected in parallel with the load certain problems are observed, such as - series or parallel resonance , overloads owing to the harmonics to the non-linear loads etc. These filters are not suitable for variable loads and they greatly depend on the system impedance. Therefore, passive filter cannot be a better solution for harmonic compensation. Another method to compensate harmonic possible solution is the active power filter (APF) technique. This technique initiates to draw care since 1970s. An active power filter normally contains of three phase pulse width modulation (PWM) voltage source inverter. When active filters are connected in series or in parallel with the load, it is likely to improve the harmonic compensation feature of the system. That is why from the beginning of the 1980s active power filters (APFs) are one of the common compensating techniques [3]. The APF can be connected in two manner parallel or series of the load. The first one is shunt active power filter known and the other is series active power filter [4]. New trend is to develop the shunt APF. It can be used under non sinusoidal supply voltages. But the voltages at the point of common coupling (PCC) of the APF are harmonics polluted which is due to the non-linear loads in the APF application environment. However, it is not always suitable to employ due to its higher cost and lower capacity. Moreover, it faces some problems when it is used in high-voltage grid. For the necessity of improving harmonic compensation performance, power factor improvement and decreasing the size of an active power filter, a series active power filter is used. Series active power filter is cost effective and easy to implement. 2. System Diagram of HSAPF Fig. 1. Block diagram of hybrid series APF Technical limitations of conventional APFs can be overcome with hybrid APF arrangements. They are generally the arrangement of basic APFs and passive filters. Which is shows in Fig. 1. Hybrid APFs, getting the profits of both passive filters and APFs offer better performance and cost-effective results. The idea behind this system is to successively decrease the switching noise and electromagnetic interference. The idea of hybrid APF has been offered by several researchers. In this arrangement, a less cost passive high-pass filter (HPF) is used Harmonic Mitigation by Using Hybrid Series Active Power Filter Hitalee A. Mahale 1 , Kalpesh M. Mahajan 2 1 M.Tech. Student, Department of Electrical Engineering, KCES’S College of Engineering and IT, Jalgaon, India 2 Professor & HoD, Department of Electrical Engineering, KCES’S College of Engineering & IT, Jalgaon, India