scholarly journals Analysis and Suppression of Voltage Violation and Fluctuation with Distributed Photovoltaic Integration

Symmetry ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1894
Author(s):  
Yahui Li ◽  
Yuanyuan Sun ◽  
Kejun Li ◽  
Jingru Zhuang ◽  
Yongliang Liang ◽  
...  
Keyword(s):  
Distribution System ◽  
Reactive Power ◽  
Influence Factors ◽  
Integrated System ◽  
Voltage Fluctuation ◽  
Partial Shading ◽  
High Penetration ◽  
Bus Voltage ◽  
Suppression Strategy ◽  
Voltage Violation

In recent years, the violation and fluctuation of system voltage has occurred with greater frequency with the integration of high-penetration distributed photovoltaic generation. In this paper, the voltage violation and fluctuation in a high-penetration distributed photovoltaic integrated system is analyzed, and then a corresponding suppression strategy is proposed. Firstly, based on solar cell and photovoltaic control system models, the influence factors of photovoltaic output are analyzed. Secondly, the voltage violation and fluctuation caused by photovoltaic integration is analyzed, and the quadratic parabola relationship between bus voltage fluctuation and photovoltaic power variation is constructed. Next, according to the virtual synchronous generator characteristic of distributed photovoltaics, a double-hierarchical suppression strategy is proposed to make full use of reactive power regulation capability, which can maintain the symmetry of power supply while meeting standard requirements. The proposed strategy can conveniently realize quick response and support the photovoltaic extensive access. Moreover, with the employment of the proposal, the system voltage violation and fluctuation can be suppressed effectively. Finally, considering the photovoltaic access location, capacity, and partial shading, the effectiveness of the proposed strategy is verified in IEEE 33-bus distribution system with field measured data. After distributed photovoltaic accesses the system, more than 60% of buses appear to have undergone bus voltage violation. With the proposed method, more than 20% of the voltage deviation and more than 6% of the voltage fluctuation are effectively suppressed so that the system voltage can be kept below 1.07 p.u. and the voltage fluctuation can be kept within 4%, meeting the requirements of power quality standards.

scholarly journals Integrating Photovoltaic Systems in Power System: Power Quality Impacts and Optimal Planning Challenges

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Aida Fazliana Abdul Kadir ◽  
Tamer Khatib ◽  
Wilfried Elmenreich
Keyword(s):  
Power Systems ◽  
Power System ◽  
Power Quality ◽  
Distribution System ◽  
Power Flow ◽  
Harmonic Distortion ◽  
Integrated System ◽  
Optimal Planning ◽  
High Penetration ◽  
Bidirectional Power Flow

This paper is an overview of some of the main issues in photovoltaic based distributed generation (PVDG). A discussion of the harmonic distortion produced by PVDG units is presented. The maximum permissible penetration level of PVDG in distribution system is also considered. The general procedures of optimal planning for PVDG placement and sizing are also explained in this paper. The result of this review shows that there are different challenges for integrating PVDG in the power systems. One of these challenges is integrated system reliability whereas the amount of power produced by renewable energy source is consistent. Thus, the high penetration of PVDG into grid can decrease the reliability of the power system network. On the other hand, power quality is considered one of the challenges of PVDG whereas the high penetration of PVDGs can lead to more harmonic propagation into the power system network. In addition to that, voltage fluctuation of the integrated PVDG and reverse power flow are two important challenges to this technology. Finally, protection of power system with integrated PVDG is one of the most critical challenges to this technology as the current protection schemes are designed for unidirectional not bidirectional power flow pattern.

Design and Performance of a PV-STATCOM for Enhancement of Power Quality in Micro Grid Applications

2017 ◽  
Vol 8 (3) ◽  
pp. 1408 ◽  
Author(s):  
Lakshman Naik P ◽  
K Palanisamy
Keyword(s):  
Power Quality ◽  
Distribution System ◽  
Reactive Power ◽  
Electrical Power ◽  
Test System ◽  
Green Energy ◽  
Integrated System ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Power Demand

<p>The Green Energy sources (solar, wind) are performing a vigorous role to reach the electrical power demand. Due to the presence of non-linear loads, reactive loads in the distribution system and the injection of wind power into the grid integrated system results power quality issues like current harmonics, voltage fluctuations, reactive power demand etc. This paper mainly investigates the designing and satisfactory performance evaluation of solar farm as PV-STATCOM (Static Synchronous Compensator) for enhancement of power quality in grid tie system by using MATLAB environment (Simulink). The proportional and integral (PI) Controller and Hysteresis Current Controller (HCC) were effectively utilized to inject the desired current from voltage source converter (VSC) based PV-STATCOM at PCC for the mitigation of quality related problems in the proposed test system.</p>

scholarly journals Reactive Power Management Based on Voltage Sensitivity Analysis of Distribution System with High Penetration of Renewable Energies

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1493 ◽  
Author(s):  
SeokJu Kang ◽  
Jaewoo Kim ◽  
Jung-Wook Park ◽  
Seung-Mook Baek
Keyword(s):  
Sensitivity Analysis ◽  
Steady State ◽  
Power Management ◽  
Distribution System ◽  
Reactive Power ◽  
Voltage Sensitivity ◽  
Transient Conditions ◽  
Voltage Variation ◽  
High Penetration ◽  
Management Method

The high penetration of distributed energy resources (DERs) in the distribution system brings new challenges related to voltage variations and reverse power flow. The sudden changes in electric power generation from the DERs due to climate conditions or their internal malfunction might cause high fluctuations in system voltage. To enhance the voltage stability when a disturbance occurs, this paper proposes a new reactive power management method to control each DER based on voltage sensitivity analysis. The voltage variation has the different features in both steady-state and transient conditions. In particular, its transient behavior depends on the type of DERs. Therefore, the particular optimal control for improving the dynamic response of voltage is difficult to apply for all types of DERs. In contrast, the voltage variation in steady-state can be controlled with the reactive power management by the sensitivity analysis between reactive power generation and system voltage. Even though this paper focuses on the reduction of voltage variation in steady-state, the relationship between the voltage variations in steady-state and transient conditions is also analyzed. The effectiveness of the proposed method is verified with several case studies on the practical distribution system in South Korea by using the time-domain simulation based on the PSCAD/EMTDC software. The results show that the proposed reactive power management method can improve the dynamic voltage responses in both steady-state and transient conditions when the distribution system has the high penetration of renewables.

scholarly journals Research on Dynamic Reactive Power Compensation Scheme for Inhibiting Subsequent Commutation Failure of MIDC

2021 ◽  
Vol 13 (14) ◽  
pp. 7829
Author(s):  
Yifan Zhang ◽  
Fei Tang ◽  
Fanghua Qin ◽  
Yu Li ◽  
Xin Gao ◽  
...  
Keyword(s):  
Reactive Power ◽  
Inhibitory Effect ◽  
Economic Benefits ◽  
Reactive Power Compensation ◽  
Normal Operation ◽  
Voltage Fluctuation ◽  
Commutation Failure ◽  
Bus Voltage ◽  
Configuration Scheme ◽  
Voltage Support

Commutation failure at the inverter side of an MIDC (multi-infeed HVDC) is usually caused by AC system faults. Suppose the converter bus voltage cannot recover to the normal operation level in time: in that case, the commutation failure will then develop into more severe subsequent commutation failures or even DC blocking, which will severely threaten the security and stability of the system. Dynamic reactive power compensation equipment (DRPCE) can offer voltage support during accident recovery, stabilize voltage fluctuation and inhibit any subsequent commutation failure risk. This paper proposes the optimal DRPCE configuration scheme for maximizing both inhibitory effect and economic performance. The simulation results on MATLAB-BPA prove the scheme’s correctness and rationality, which can effectively inhibit the risk of subsequent commutation failure and obtain economic benefits.

scholarly journals Low-Harmonic DC Ice-Melting Device Capable of Simultaneous Reactive Power Compensation

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2596
Author(s):  
Jiazheng Lu ◽  
Siguo Zhu ◽  
Bo Li ◽  
Yanjun Tan ◽  
Xiudong Zhou ◽  
...  
Keyword(s):  
Transmission Lines ◽  
High Efficiency ◽  
Reactive Power ◽  
Reactive Power Compensation ◽  
Negative Deviation ◽  
Ice Melting ◽  
Voltage Fluctuation ◽  
Small Power ◽  
Supply Capacity ◽  
Bus Voltage

As a result of the high efficiency of ice-melting and the small power supply capacity, DC ice-melting devices are widely used in relation to transmission lines in the power grid. However, it needs to consume reactive power when ice-melting, and voltage fluctuation of the substation may be caused when the demand for reactive power is large. It also generates a large number of 5th and 7th harmonics when ice-melting. In this paper, combined with the demand for ice-melting for transmission lines and the dynamic reactive power of substations, a low-harmonic DC ice-melting device capable of simultaneous reactive power compensation is studied. The function of ice-melting and reactive power compensation can be operated simultaneously and the rectifier’s main harmonics can be eliminated. The simulation and experimental research on the device was carried out in the 500 kV Chuanshan substation. The actual ice melting was carried out on the 500 kV Chuansu I line and took only 68 min to melt the ice. The 500 kV bus voltage had no negative deviation, and the positive deviation decreased from +3.09% to +1.57% within 24 h of testing. The results prove the feasibility of the proposed DC ice-melting device in this paper.

scholarly journals Research on SCESS-DFIG DC Bus Voltage Fluctuation Suppression Strategy for Frequency Inertia Regulation of Power Grid

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 173933-173948
Author(s):  
Dongyang Sun ◽  
Haotian Long ◽  
Kai Zhou ◽  
Yanling Lv ◽  
Jun Zheng ◽  
...  
Keyword(s):  
Power Grid ◽  
Voltage Fluctuation ◽  
Dc Bus ◽  
Bus Voltage ◽  
Suppression Strategy

scholarly journals Phase Balancing and Reactive Power Support Services for Microgrids

2019 ◽  
Vol 9 (23) ◽  
pp. 5067 ◽  
Author(s):  
Anastasis Charalambous ◽  
Lenos Hadjidemetriou ◽  
Lazaros Zacharia ◽  
Angelina D. Bintoudi ◽  
Apostolos C. Tsolakis ◽  
...  
Keyword(s):  
Distribution System ◽  
Reactive Power ◽  
Renewable Energy Sources ◽  
Ancillary Services ◽  
Active Components ◽  
Modern Distribution ◽  
Central Controller ◽  
High Penetration ◽  
Point Of Common Coupling ◽  
Distribution Grids

Alternating current (AC) microgrids are expected to operate as active components within smart distribution grids in the near future. The high penetration of intermittent renewable energy sources and the rapid electrification of the thermal and transportation sectors pose serious challenges that must be addressed by modern distribution system operators. Hence, new solutions should be developed to overcome these issues. Microgrids can be considered as a great candidate for the provision of ancillary services since they are more flexible to coordinate their distributed generation sources and their loads. This paper proposes a method for compensating microgrid power factor and loads asymmetries by utilizing advanced functionalities enabled by grid tied inverters of photovoltaics and energy storage systems. Further, a central controller has been developed for adaptively regulating the provision of both reactive power and phase balancing services according to the measured loading conditions at the microgrid’s point of common coupling. An experimental validation with a laboratory scale inverter and a real time hardware in the loop investigation demonstrates that the provision of such ancillary services by the microgrid can significantly improve the operation of distribution grids in terms of power quality, energy losses and utilization of available capacity.

scholarly journals Sizing and Location Optimization of DSTATCOM in Radial Distribution System

2019 ◽  
Vol 9 (2S4) ◽  
pp. 651-655
Keyword(s):  
Radial Distribution ◽  
Distribution System ◽  
Reactive Power ◽  
Optimization Methods ◽  
Voltage Profile ◽  
Radial Distribution System ◽  
Location Optimization ◽  
Simulation Results ◽  
Bus Voltage ◽  
Static Compensator

A huge review on greatest allocation of Distribution Static Compensator (DSTATCOM) strategies in Radial Distribution system (RDS) device for compensation of reactive power (Q), mitigation of electricity losses and enhancement in voltage profile is presented. DSTATCOM compensates bus voltage to restriction the strength factor, in addition with energetic and additionally reactive power flows in the RDS. It can additionally provide immediate and non-stop capacitive (C) and inductive (L) mode compensation. This system also injects quantity of lead or lagging compensating current, when it is connected with a same load or varying load. Various IEEE buses are used for checking the achievability of the optimization methods in distribution system. In few papers the presented approach is evaluated through evaluating it with previous techniques and benefits are shown by means of simulation results.

Power quality improvement in a photovoltaic based microgrid integrated network using multilevel inverter

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Balaram Das ◽  
Pratap K. Panigrahi ◽  
Soumya R. Das ◽  
Debani P. Mishra ◽  
Surender Reddy Salkuti
Keyword(s):  
Power Quality ◽  
Reactive Power ◽  
Sliding Mode ◽  
Current Control ◽  
Integrated System ◽  
Multilevel Inverter ◽  
Phase System ◽  
Proposed Model ◽  
Three Phase ◽  
Bus Voltage

Abstract The increasing use of power electronics devices as well as the integration of renewable source-based microgrids (MG) has seriously affects the power quality (PQ) of the three-phase power system. Therefore, for the improvement of PQ, it is required to reduce the total harmonics distortion (THD) in the utility network. In this work, the improvement of PQ is discussed in a photovoltaic (PV) based MG integrated three-phase system using a three-level H-bridge (3LHB) multilevel inverter (MI). The MI is used for compensating the source current harmonics and reducing the THD by meeting the IEEE standard guidelines. Besides, the proposed model helps manage the reactive power with control of DC link bus voltage through the PV system. The proposed model is helpful not only in reducing the harmonics but also in providing additional active power to the load if any electrical disturbances occur on the grid side. The maximum power point tracking (MPPT) technique employed in PV is of an improved form of Perturb and Observe (P&O). Further, the reference current generation is derived using the direct current control (DCC) and indirect current control (ICC) techniques. The MG integrated MI is investigated in both DCC and ICC method using three different DC bus voltage controllers; proportional-integral (PI), fuzzy logic controller (FLC), and fuzzy sliding mode control (FSMC). The proposed microgrid integrated system is analyzed with the MATLAB/Simulink tool.

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