Power Quality Improvement Techniques Research Articles

A critical analysis of different power quality improvement techniques in microgrid

A critical analysis of different power quality improvement techniques in microgrid

An analytic hierarchy process-based novel approach for benchmarking the power quality performance of grid-integrated renewable energy systems

The technical, social, economic as well as environmental multi-benefits of renewable energy sources do not come without certain power quality (PQ) challenges, and deterioration of voltage and current quality is foremost among them. Technically, voltage harmonic distortion, current harmonic distortion, voltage and frequency fluctuations and voltage imbalances are the five decisive issues that judge the PQ performance of renewable energy systems. Healthy PQ, in terms of all the aforementioned phenomena, is assured by monitoring and benchmarking their corresponding indices, but performing the same, only at distributed generation (DG) bus level, is not sufficient since also the grid, as well as load bus PQ, plays an important role which makes the overall PQ assessment of renewable energy systems quite complex. This paper presents an analytic hierarchy process-based novel approach for evaluating and benchmarking the PQ performance of grid-integrated renewable energy systems. The procedure results in a single compound power quality index that is alone ample for benchmarking the overall PQ performance of a renewable energy system above the threshold level as well as for ranking among the PQ performances of individual DG systems differentiated by either renewable energy types or sittings in a distribution network. Such a compound index can ease the PQ performance evaluation and benchmarking process up to a maximum extent. Furthermore, it can be very helpful also for distribution system operators to monitor and penalize the DG owners for poorly operating from PQ aspects and motivate the same for adopting best option among different power quality improvement (PQI) technologies. The proposed approach is verified on a grid-integrated PV-based DG system in MATLAB/Simulink. Besides that, the effect of different PQI techniques, on PQ performance, is tested by the application of the proposed approach. At last, the validation of impending effects of high penetration of renewable energy on PQ of the system is also attempted by the proposed approach.

Cost Effective Power Quality Improvement Technique by Utilization of Solar Power for Non-Linear Loads

Nowadays usage of digital gadgets and other low power devices has increased exponentially, which has power converters to convert from utility AC voltage to required level of DC voltage. These power converters (Adopters), which are considered as Non-linear loads, in turn induces harmonics on the supply side. Due to these induced harmonics, power quality of the utility supply will be degraded affecting the performance of other linear loads connected to the same supply. This paper discusses the effects of non-linear loads and corrective actions available in the literature. An effort has been made to analyze the performance of some domestic non-linear loads using MATLAB/SIMULINK software and verify the same by experimental setup. The Total Harmonic Distortion is analysed using FFT window and simulation and experimental results were compared. Then, a solar powered DC supply is proposed which can power all digital gadgets and other low power devices. As DC supply is generated from the solar power, the connection of non-linear loads to utility supply is reduced, thereby improving the power quality of the distribution side. Adoption of the proposed DC supply for low power digital gadgets, both in rural and urban areas will definitely make the domestic power consumers to be independent of depleting conventional grid power supply at low cost.

Power Quality Improvement of Grid Connected Wind Energy System Using DSTATCOM-BESS

Electricity generation from wind energy has increased rapidly in recent years and the trend is likely to continue. Due to intermittent environmental factors and integration of wind power generation system with the grid, creates power quality issues including voltage swells, voltage dips, harmonics, power factor and poor voltage regulation. When wind power is injected into the grid, it reduces the performance of utility as well as consumer’s equipment. To improve the power quality, a Distribution Static Compensator (DSTATCOM) is used. This paper itroduces the power quality improvement technique for grid connected wind power plant using DSTATCOM with battery energy storage system (BESS). The proposed scheme mainly depends on the reactive power supply requirements of the load and the induction generator. The proposed scheme is simulated in MATLAB/Simulink software.

A novel componentsless power quality improvement technique for renewable energy sources

The main aim in power distribution system is to provide uninterrupted flow of energy at smooth sinusoidal voltage at the contracted magnitude level and frequency. However in wind power generation have numerous non linear loads, which significantly affect the quality of the power supplies. As the power of the non linear loads, the purity of the waveform of supplies is lost. In this proposed work, multiple port choppers is used to handle power quality issues such as voltage sags, harmonic distortion, in addition to normal wind turbine supplying to the customer during normal operation. The wind generation with micro turbine provides the flexibility of operation to the customer. The micro turbine based DVR can recover voltage sags in the supply voltageduring abnormal load. On the other hand, it will operate as a separate DG whenthe wind power supply fails to supply the desired power.

A noval componentsless power quality improvement technique for renewable energy sources

A noval componentsless power quality improvement technique for renewable energy sources

Power quality improvement in distribution network using DSTATCOM with battery energy storage system

The distribution static compensator (DSTATCOM) provides fast control of active and reactive powers to enable load compensation, harmonics current elimination, voltage flicker mitigation, voltage and frequency regulation. This paper presents power quality improvement technique in the presence of grid disturbances and wind energy penetration using DSTATCOM with battery energy storage system. DSTATCOM control is provided based on synchronous reference frame theory. A modified IEEE 13 bus test feeder with DSTATCOM and wind generator is used for the study. Power quality events during grid disturbances such as feeder tripping and re-closing, voltage sag, swell and load switching have been studied in association with DSTATCOM. The power quality disturbances due to wind generator outage, synchronization and wind speed variations have also been investigated. The study has been carried out using MATLAB/SIMULINK and the simulation results are compared with real time results obtained by the use of real time digital simulator (RTDS) for validating the effectiveness of proposed methodology. The proposed method has been proved to be effective in improvement of power quality with all disturbances stated above.

Power Quality Improvement of Grid Connected Wind Farms through Voltage Restoration Using Dynamic Voltage Restorer

Increasing sensitivity of the loads with respect to power quality has gained the interest of power system analysis and power quality improvement techniques. The voltage sags or swells which are characterized by rms voltage variations outside the normal operating range of voltages due to faults may lead to improper disconnection of wind turbines. This paper deals with the effective voltage sag/swell mitigation using Dynamic Voltage Restorer (DVR), to regulate the terminal voltage of the wind farm. The DVR utilizes a feed forward vector control based algorithm to generate the PWM based firing signals for injecting appropriate compensation voltages. The actual wind farm field data of the voltage sag and swell events during fault conditions are re- created using MATLAB/Simulink and restored by employing DVR. The simulation results are shown to verify the operation of DVR during balanced voltage sag and swell conditions.

Survey on Microgrid: Power Quality Improvement Techniques

Microgrid became one of the key spot in research on distributed energy systems. Since the definition of the microgrid is paradigm of the first time, investigation in this area is growing continuously and there are numerous research projects in this moment all over the world. The increased infiltration of nonlinear loads and power electronic interfaced distribution generation system creates power quality issues in the distributed power system. In this paper, a comprehensive survey on microgrid to improve the power quality parameters is taken as the main objective. Furthermore, the detailed investigations are explored in this paper for the enhancement of power quality issues with the help of an optimization technique, filters, controllers, FACTS devices, compensators, and battery storage.