Load Flow Calculation with Voltage Regulators Bidirectional Mode and Distributed Generation

Massignan, Julio A. D.; Pereira, Benvindo Rodrigues; London, João Bosco Augusto

doi:10.1109/tpwrs.2016.2576679

Cited by 22 publications

(10 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where S is the switching state vector of bidirectional AC/DC converter and the = 0,1 (1,2,3,4,5,6) is considered as the switching state variable that takes 1 and 0 when the IGBT is ON and OFF, and are the switching state variables of upper and lower [ ]…”

Section: Grounding Fault Model Of Lvdc Supply and Utilization Systemmentioning

confidence: 99%

See 1 more Smart Citation

Grounding Fault Model of Low Voltage Direct Current Supply and Utilization System for Analyzing the System Grounding Fault Characteristics

Liu¹,

Sun²,

Ma³

et al. 2021

Symmetry

View full text Add to dashboard Cite

Grounding fault analysis is of vital importance for low voltage direct current (LVDC) supply and utilization systems. However, the existing DC grounding fault model is inappropriate for LVDC supply and utilization system. In order to provide an appropriate assessment model for the DC grounding fault impact on the LVDC supply and utilization system, an LVDC supply and utilization system grounding fault model is proposed in this paper. Firstly, the model is derived by utilizing capacitor current and voltage as the system state variable, which considers the impact of the converter switch state on the topology of the fault circuit. The variation of system state parameters under various fault conditions can be easily obtained by inputting system state data in normal conditions as the initial value. Then, a model solution algorithm for the proposed model is utilized to calculated the maximum fault current, the system maximum fault current with different grounding resistance is simple to acquired based on the solution algorithm. The calculation results demonstrate that grounding resistance and structure of LVDC supply and utilization system have remarkable impacts on the transient current. The effectiveness of the proposed model is verified in PSCAD/EMTDC. The simulation results indicate that the proposed method is appropriate for the system fault analysis under various fault conditions with different grounding resistance and the proposed model can offer theoretical guidance for system fault protection.

show abstract

Section: Grounding Fault Model Of Lvdc Supply and Utilization Systemmentioning

confidence: 99%

“…Due to the over-depleting of fossil fuels and the stress of climate change, the energy need is shifting from conventional fossil fuels to renewable energies [1][2][3]. Most renewable energies such as photovoltaic (PV) use the direct current connection, which is totally different from the conventional energy plant [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Grounding Fault Model of Low Voltage Direct Current Supply and Utilization System for Analyzing the System Grounding Fault Characteristics

Liu¹,

Sun²,

Ma³

et al. 2021

Symmetry

View full text Add to dashboard Cite

show abstract

“…For unbalanced-load current compensation, the compensator should eliminate the entire negative-sequence component and the imaginary part of the positive-sequence component of the load current, as shown in Equations (18) and (19) [26,27]. By combining Equations (18) and (19), the compensation command of the delta-connected compensator is obtained for each arm, as presented in Equation (20). The rating of the compensator can also be determined from Equation (20).…”

Section: Compensation Principlementioning

confidence: 99%

“…The compensator connected at Bus n can compensate for the imaginary part of the positive-sequence load side current and the entire negative-sequence load side current. For example, if the compensator is connected at Bus 1, then the compensator executes the compensation rule presented in Equations (18) and (19). Thus, the power source side only supplies a balanced three-phase current with a unity power factor, and the power quality is improved.…”

Section: Compensation Principlementioning

confidence: 99%

“…In [13][14][15], authors explore a reverse power problem and load-balancing technique in a microgrid. Authors in [16][17][18][19][20] have discussed reactive power control and voltage regulation issues in microgrids. However, a compensation scheme integrating bidirectional power-flow balancing and EPQ improvement in a three-phase microgrid is seldom seen.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improvements in Bidirectional Power-Flow Balancing and Electric Power Quality of a Microgrid with Unbalanced Distributed Generators and Loads by Using Shunt Compensators

Chang

Yen

2018

Energies

View full text Add to dashboard Cite

Improper connections of unbalanced distributed generators (DGs) and loads in a three-phase microgrid cause unbalanced and bidirectional power flow problems. The unbalanced DGs and loads may also aggravate the electric power quality (EPQ), such as voltage regulation, power factor, and unbalanced current and voltage. This increases the difficulty of operation in a microgrid. In this study, a three-phase, delta-connected, shunt-type universal compensator was employed for achieving the bidirectional power-flow balancing and improving the EPQ of a three-phase, distribution-level microgrid with unbalanced DGs and loads. A feedforward compensation scheme was derived for the compensator by using the symmetrical components method. In practical applications, the universal compensator can be implemented as static var compensators (SVCs), static synchronous compensators (STATCOMs), or an additional function of active filters. With the on-line compensation of the proposed compensator, the bidirectional power-flow balancing and EPQ improvement in the microgrid were achieved. A demonstration system was proposed to present the effectiveness of the compensator.

show abstract

Mobile model for distributed generations and battery energy storage systems in radial grids

Hemmati

2019

Journal of Renewable and Sustainable Energy

View full text Add to dashboard Cite

In this paper, mobile distributed generations (DGs) and battery energy storage systems (BESSs) are modeled and integrated into the network. The optimal locations of DGs and BESSs are determined for each season over the year, and the installed DG-energy storage system (ESS) may be transferred to new buses at each season. The methodology is simulated on a radial electrical distribution network, and the location, size, and hourly operation of DGs and ESSs are optimized. DC power flow is adopted to model the power flow in the grid. In the DC power flow, the active power losses in the lines and reactive power of the loads are not included. Since the network is radial and the modeling is lossless, it is expected that the DGs and BESSs cannot present their positive abilities efficiently. Four cases are simulated including case 1: network without BESSs and DGs; case 2: fixed operation pattern and location for BESSs and DGs under all seasons; case 3: variable operation pattern and fixed location for BESSs and DGs under all seasons; and case 4: variable operation pattern and location for BESSs and DGs under all seasons. The planning installs one 0.0470 p.u. DG and one 0.0202 p.u. BESS on the network, resulting in 0.5 Million $/year reduction in the costs. However, the results verify that changing locations of the DGs and BESSs cannot have significant impacts on the results. This point confirms that the application of DC power flow in radial distribution networks is not suitable and cannot develop all advantages of BESSs and DGs.

show abstract

Load Flow Calculation with Voltage Regulators Bidirectional Mode and Distributed Generation

Cited by 22 publications

References 3 publications

Grounding Fault Model of Low Voltage Direct Current Supply and Utilization System for Analyzing the System Grounding Fault Characteristics

Grounding Fault Model of Low Voltage Direct Current Supply and Utilization System for Analyzing the System Grounding Fault Characteristics

Improvements in Bidirectional Power-Flow Balancing and Electric Power Quality of a Microgrid with Unbalanced Distributed Generators and Loads by Using Shunt Compensators

Mobile model for distributed generations and battery energy storage systems in radial grids

Contact Info

Product

Resources

About