Accepted: 22 December 2015 Abstract When the line impedance is considered in the microgrid, the accuracy of load sharing will decrease. In this paper, the impact of line impedance on the accuracy of load sharing is analyzed. A robust droop control for a high-voltage microgrid is proposed based on the signal detection on the high-voltage side of the coupling transformer.

Voltage regulator - Wikipedia, the free encyclopedia. An integrated circuit voltage regulator in a TO- 2. Such devices are popular because they require few or no.

For a high-voltage microgrid, the equivalent impedance of coupling transformer connecting distributed generator with the grid is usually the dominate factor. Compared with the conventional droop control strategy, the proposed control method in this paper detects the feedback signal from the high-voltage side of the coupling transformer. The impact of line impedance on the load sharing accuracy can be mitigated significantly. The proposed droop control only changes the detection point of the feedback signal, thus it is easy to be implemented. The PSCAD/EMTDC simulation results show the effectiveness of the proposed robust droop control concept in load sharing and voltage regulation with highly accuracy. In order to address the environmental pollution and energy crisis, many distributed generations (DGs), e.g., solar energy, wind energy, microturbines, and fuel cells are widely used. These DGs are connected to the utility grid via inverters, which are also known as the microgrid [, ].

Solution.pdf Related Questions in. Driver Keyboard Genius Ku-0138. Wat is full form of ASA in ASA modification method of determinig regulation? What is the procedure to find voltage. Dc Machines And Synchronous Machines - M. No load and load characteristics, types of excitation, armature.

The operation mode of the microgrid can be switched between grid-connected and islanded mode flexibly [ ]. A necessary problem for parallel-operated DGs in a microgrid is how to avoid the circulating current among them. One of the key techniques is to use droop control [, ], which has been widely used in conventional synchronous generators [ ] and uninterruptible power supply (UPS) [ ]. Its advantage is that each DG is able to be operated independently without any critical communication. Although the droop control is widely used as a wireless control strategy for load sharing, it has some drawbacks that limit its application.

For instance, the load sharing accuracy is degraded if the per-unit impedances (the output impedance and the line impedance) of each DG are unbalanced [ ]. Usually, P-f and Q-V droop control are used when the equivalent impedance which connecting DGs to the gird is inductive in a microgrid [ ]. The active power can be shared accurately using P-f droop control since it is just based on the frequency of the microgrid. However, the DG voltage output in Q-V droop control is different with the voltage at the point of common coupling (PCC) because of the different line impedances. Thus the accuracy of reactive power sharing using Q-V droop control is usually substantially affected by the equivalent impedance of DG and line impedance [ ]. In order to enhance the accuracy of reactive power sharing, the droop control gains are necessary to be optimized [, ]. However, there are still inherent tradeoff between the load sharing accuracy and voltage regulation.

Therefore, these methods are only valid for the microgrid with short distribution lines where the line impedance is negligible. Recently, the virtual reactor or integral unit to adjust the equivalent impedance of DGs is added to the conventional droop control loop [, ]. However, the line impedance is still unknown even the equivalent impedance of DGs can be established.

Thus, the line impedances are detected or calculated in some literatures [, ] in order to mitigate their influence. However, it is quite complicated to implement. In some cases, the external communication is still adopted [ ]. However, the reliability and stability of microgrids will be affected substantially by the communication system.