Control Strategy to Regulate Voltage and Share Reactive Power Using Variable Virtual Impedance for a Microgrid
Abstract
:1. Introduction
2. Control Method
3. Small-Signal Stability Analysis
4. Results
4.1. Distribution Network Case Test
4.2. Single Electric Vehicle Connection
- Event 1: an EV is connected to Node 1 at 10 s, increasing the power consumption of L1 by three times the value of the fixed load (25 + j0.001 Ω).
- Event 2: an EV is connected to Node 2 from 20 s, increasing the power consumption of L2 about three times the value of the fixed load (10 + j0.03 Ω).
- Event 3: from 30 s, an EV is connected to Node 3, increasing the power consumption of L3 by two times the value of the fixed load (20 + j0.01 Ω).
- Event 4: another EV is connected from 40 s to Node 4, increasing the power consumption of L4 by two times the value of the fixed load (15 + j0.02 Ω).
- Event 5: the connection of an EV is presented in Node 5 from 50 to 60 s, increasing the power consumption of L5 by 12 times the value of the fixed load (25 + j0.09 Ω).
- Event 6: this final event considers that an EV is connected from 60 s to Node 6, which generates an additional power consumption of L6 of almost five times the value of the fixed load (18 + j0.05 Ω).
4.2.1. Active and Reactive Power of Loads
4.2.2. Voltage in Loads
4.2.3. Responses of DGs
4.3. Multiple Electric Vehicle Connection and Disconnection
- Event 1: at the beginning of the first period (from to ), L1 increases the active power consumption after connecting five EVs to Node 1, changing the power by nine times the fixed load of 25 + j0.001 Ω; at the end of the period, this load is disconnected.
- Event 2: at the beginning of the second period (from to ), the active power increases in L2 when one EV is connected to Node 2, and the power increases by four times its normal value of 10 + j0.03 Ω; at the end of the period, this load is disconnected.
- Event 3: at the beginning of the third period (from to ), the greatest change of active power is presented in Node 3 (L3) with the connection of 10 EVs, and the consumption in that node is almost 13 times the fixed load of 20 + j0.01 Ω; at the end of the period, this load is disconnected.
- Event 4: at the beginning of the fourth period (from to ), three EVs are connected to Node 4 (L4), which provides a power consumption of almost five times the average consumption of 15 + j0.02 Ω; at the end of the period, this load is disconnected.
- Event 5: at the beginning of the fifth period (from to ), the connection of two EVs is presented at Node 5 (L5), resulting in an increase in the load of 22 times the normal active power consumption with respect to the fixed load of 25 + j0.09 Ω; at the end of the period, this load is disconnected.
- Event 6: at the beginning of the sixth period (from to ), two EVs are connected to Node 6 (L6), which generates an additional power consumption at the node of almost eight times the normal consumption of 18 + j0.05 Ω; at the end of the period, this load is disconnected.
4.3.1. Active and Reactive Power
4.3.2. Voltage Variations
4.3.3. Generation Behavior
- During the first two periods of simulation (Event 1 and Event 2), the microgrid is subjected to the connection and disconnection of five EVs in Node 1 and followed by one EV connected to Node 2. During these two periods, DGs 1 and 3 are the ones that present the most changes in active power and after some seconds, they finish sharing similar values.
- Then, in the third period (Event 3), 10 EVs are connected to Node 3 at the beginning of the period and disconnected at the end of the period. During this period, DG 2 responds more abruptly to the load change, because this generator is closer than the others to the variable load.
- Later, in the fourth period (Event 4), three EVs are connected to Node 4. In this case, DGs 2 and 3 are the ones that respond most to this load change because they are closest to the load, while the control stabilizes the three generators at the same value of active output power.
- In the fifth period (Event 5), two EVs are connected to Node 5. When analyzing the simulation, the DG that responds more to this change is the DG 3, because it is closest to the variations. However, with the help of the control strategy, the output power is stabilized to the same value as the other two DGs.
- Finally, in the sixth period (Event 6), two EVs are connected to Node 6. In this case, DG 3 undergoes the most abrupt change in power generation, because it is the closest generator to the load.
- DG 1 undergoes the most abrupt change in reactive power during the first period (Event 1), because the connection of EVs is closest to this generator.
- Next, during the second period (Event 2), the same generator undergoes the greatest change in reactive power; however, this time with a negative change because it delivers less reactive power because the load decreases 80% at Node 1 (disconnection of five EVs) and Node 2 increases only to one connected EV.
- In the third period (Event 3), DG 3 increases the reactive power because of the load changes from one EV to 10 EVs. Then, the load increases 90%, and DG 2 delivers more reactive power because the EVs are connected to the same node as the generator. Thus, the proposed control strategy performs regulation according to the closest generator.
- In the fourth period (Event 4), the power reduces in DGs 1 and 2 because of the load change from 10 EVs at Node 3 to only three EVs connected at Node 4.
- In the fifth period (Event 5), the powers of DGs 1 and 2 are reduced because three EVs are disconnected from Node 4 and two EVs are connected to Node 5. If the connection of EVs occurs at a greater distance from these two DGs and much closer to DG 3, then the reactive power in DG 3 increases considerably.
- Finally, in the sixth period (Event 6), it is possible to see a slight increase in reactive power delivered by DGs 1, 2, and 3. Although the connection of two EVs at Node 6 is equal to those disconnected from Node 5, the power requirement changes, and they are separated by a line impedance R = 0.321 Ω and L = 6.23 mH; hence, the reactive power delivered from the DGs in the microgrid is increased.
4.3.4. Frequency Regulation
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Molina, E.; Candelo-Becerra, J.E.; Hoyos, F.E. Control Strategy to Regulate Voltage and Share Reactive Power Using Variable Virtual Impedance for a Microgrid. Appl. Sci. 2019, 9, 4876. https://doi.org/10.3390/app9224876
Molina E, Candelo-Becerra JE, Hoyos FE. Control Strategy to Regulate Voltage and Share Reactive Power Using Variable Virtual Impedance for a Microgrid. Applied Sciences. 2019; 9(22):4876. https://doi.org/10.3390/app9224876
Chicago/Turabian StyleMolina, Eder, John E. Candelo-Becerra, and Fredy E. Hoyos. 2019. "Control Strategy to Regulate Voltage and Share Reactive Power Using Variable Virtual Impedance for a Microgrid" Applied Sciences 9, no. 22: 4876. https://doi.org/10.3390/app9224876
APA StyleMolina, E., Candelo-Becerra, J. E., & Hoyos, F. E. (2019). Control Strategy to Regulate Voltage and Share Reactive Power Using Variable Virtual Impedance for a Microgrid. Applied Sciences, 9(22), 4876. https://doi.org/10.3390/app9224876