The telecommunication industry typically employs 48 V, which is deemed optimal for Low Voltage (LV) DC distribution systems. The issue of circulating current arises when converters are connected in parallel, as illustrated in Fig. 5, due to mismatches in their output voltages.
Sudden variations in input power, changes in load, and errors in voltage or current feedback can lead to DC bus voltage variations 5. Variations in converter output voltages can also lead to circulating current. The main control objectives of DCMGs involve maintaining bus voltage within acceptable bounds and facilitating efficient load sharing.
A robust optimal distributed control design for simultaneous voltage regulation and current sharing in DC microgrid. IET Smart Grid, 653–665 (2023). The authors also acknowledge technical support received from the Renewable Energy Lab at Prince Sultan University, Riyadh, Saudi Arabia.
Regardless of the changes in input voltages, the method effectively ensures the desired current engagement and effectively regulates the bus voltage deviation. These findings highlight the effectiveness of the proposed approach in enhancing load current sharing and stabilizing the DC vector voltage under varying operating conditions.
To ensure accurate current distribution and minimize sharing discrepancies, the nominal voltage of all converters is dynamically modified through local control methods. As a result, converters with higher voltage deviation and lower nominal voltage exhibit diminished current value sharing.
An alternative method involves offline optimization techniques like particle swarm optimization (PSO) and genetic algorithms to determine optimal droop resistor values that reduce current sharing errors.
tched-capacitor circuits exploit the charge storing abilities of CMOS to achieve precision signal processing. Thus, high-performance filters and data converters
An improved droop control method for DC microgrids based on low bandwidth communication with DC bus voltage restoration and enhanced current sharing accuracy. IEEE …
This paper studied the characteristics of a virtual-capacitor based DC current suppression method for an L C L type grid connected inverter. The method was implemented …
In [68] it is presented a sorting control method to minimize voltage fluctuation on submodule capacitors under low-frequency carrier modulation. The authors combine a sorting …
The self-charging algorithm uses energy conversion law to control the charging and discharging of the DC-link capacitor as compared with the conventional algorithm which …
2.2 Conventional capacitor voltage balancing sorting algorithm Capacitor voltage balancing sorting algorithm makes use of the effect of arm current on capacitor voltages to keep …
This algorithm can obtain the average value of local voltage estimation for each VSG unit, eliminating the limitation of local information and the influence of unexpected factors …
This study presents a submodule capacitor voltage self‐balancing method for modular multilevel converters (MMCs) based on switching state matrix construction, which has …
This paper presents a new voltage sorting algorithm for suppressing submodule''s (SM) capacitor voltage fluctuations and minimizing voltage difference in Modular Multilevel Converters (MMC) …
This paper proposes a fundamental frequency sorting algorithm for balancing the floating capacitors in modular multilevel converters with low-frequency carrier phase shift …
Low Cost Microcontroller Based Implementation of Robust Voltage Based Capacitor Charge Balance Control Algorithm Liang Jia, Member, IEEE,andYan-FeiLiu, Senior Member, IEEE …
1 · This work proposes such a current-fed DC–AC switched capacitor converter (SCC). This converter offers advantages such as reduced count of switched capacitors and power devices, …
Conventional voltage regulation methods that depend on an on-load tap changer (OLTC) and VAR compensation devices, such as step voltage regulators (SVRs) and switched …
1 · This work proposes such a current-fed DC–AC switched capacitor converter (SCC). This converter offers advantages such as reduced count of switched capacitors and power devices, …
This paper presents a method to control the grid current indirectly by controlling the converter side current with compensation of the filter capacitor current. The proposed control algorithm uses …
supporting capacitor voltage references must be adjusted significantly in response to power variations. Since the voltage on capacitors cannot change instantaneously, the supporting …
This paper studied the characteristics of a virtual-capacitor based DC current suppression method for an L C L type grid connected inverter. The method was implemented …
2.2 Conventional capacitor voltage balancing sorting algorithm Capacitor voltage balancing sorting algorithm makes use of the effect of arm current on capacitor voltages to keep …
Low Cost Microcontroller Based Implementation of Robust Voltage Based Capacitor Charge Balance Control Algorithm Liang Jia, Member, IEEE,andYan-FeiLiu, Senior Member, IEEE …
In this paper, a low cost microcontroller based control method utilizing the concept of capacitor charge balance is presented to achieve a near-optimal transient response …
This paper proposes a pulsewidth modulation (PWM) control algorithm for a six-phase PMSM. In low-voltage vehicle components such as electric power steering, the current …
MMC has shown great advantages in medium voltage and high-power applications, but not yet wide speared because of its voltage ripples. In the low-frequency carrier modulation, the …
Of paramount importance to the proper operation of modular multilevel converter (MMC) is the sub-module (SM) capacitor voltage balancing. Two major approaches proposed …
In [68] it is presented a sorting control method to minimize voltage fluctuation on submodule capacitors under low-frequency carrier modulation. The authors combine a sorting algorithm that ...