A direct power control (DPC) approach is proposed in this study for a grid-tied photovoltaic (PV) voltage source inverter (VSI) to regulate active and reactive power flow directly in between utility grid and microgrid (MG) by controlling point of common coupling (PCC) voltage.
The coupling of PV inverters connected to the grid through phase-locked loops (PLL) and voltage-current controllers is enhanced in the case of a weak grid. This in turn, brings a series of wide-frequency domain multi-timescale stability problems to the operation of large-scale power plants .
In addition, when voltage feedforward control is introduced, the stability of grid-connected inverters using both time-domain PR control and dq -domain PI control is reduced, particularly at high PLL bandwidths, which may lead to instability.
For more information on the journal statistics, click here. Multiple requests from the same IP address are counted as one view. Under the background of high permeability, voltage feedforward control may further weaken the stability of grid-connected inverter (GCI) systems and may cause sub-synchronous oscillation in extreme cases.
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As the grid line impedance is not negligible, the grid-connected operation of PV power plants faces a real challenge to access the weak grid [7], [8]. The coupling of PV …
In the current, widely used current-controlled voltage-source inverters, the inverter output ac current is normally controlled in order to control the active and reactive power output of the …
Under the background of high permeability, voltage feedforward control may further weaken the stability of grid-connected inverter (GCI) …
Grid voltage at the grid connection point (without feed power), Grid impedance at the terminal of the inverter, Applicable conditions regarding inverter-based grid monitoring in …
We further designed a voltage control scheme that regulates the inverter AC-side output voltage to the desired set-point and preserves the inverter passiv- ity properties. …
When the photovoltaic power supply is connected to the power grid, the grid connection point will face the risk of voltage exceeding the limit. In this paper, the working …
Hybrid inverters are redefining the relationship between solar energy systems and the grid by offering flexibility, energy independence, and enhanced efficiency.
A direct power control (DPC) approach is proposed in this study for a grid-tied photovoltaic (PV) voltage source inverter (VSI) to regulate active and reactive power flow directly in between …
The scale and structure of the grid also influence the inverter''s connection methods and operational requirements. For example, in different voltage-level grids (e.g., low-voltage and …
Under the background of high permeability, voltage feedforward control may further weaken the stability of grid-connected inverter (GCI) systems and may cause sub …
The AC-driven (PWM) inverters are power converters that convert DC-Bus voltage to AC voltage. The PWM inverter''s DC-Bus capacitor functions as an energy barrier to …
A direct power control (DPC) approach is proposed in this study for a grid-tied photovoltaic (PV) voltage source inverter (VSI) to …
However, the component series connected voltage is generally not so high, and the circuit needs to be adjusted. The grid tie …
4.2 Control techniques of DC link voltage The proper regulation of the DC link voltage is a crucial aspect of inverter operation, as the voltage level of the DC link, serving as an intermediary …
Abstract—Power electronic converters for integrating renew-able energy resources into power systems can be divided into grid-forming and grid-following inverters. They possess …
A direct power control (DPC) approach is proposed in this study for a grid-tied photovoltaic (PV) voltage source inverter (VSI) to regulate active and reactive power flow …
Aimed at this problem, case studies of inductive and resistive grid impedance with different grid strengths have been carried out to …
By analyzing the impact of exceeding voltage limits after the photovoltaic grid connection, this method ensures effective voltage regulation in the grid-connected substation …
The inverter changes the altitude of Id (d-axis value of grid-current-space-vector in the grid-voltage-coordinate) to change Udc into Udc-reference'' …
Note that, voltage-sourced inverter (VSI) is a buck topology and thus, to generate 415 V at the AC terminal of the VSI, a DC-link voltage is …
State-of-the-art control strategies for inverter-based sources tend to be categorized as either grid-following or grid-forming [4]. A defining characteristic of grid-following controls is …
For single-phase system, the maximum line-to-line voltage needs to be generated by the inverter is simply the grid''s line-to neutral …
The inverter changes the altitude of Id (d-axis value of grid-current-space-vector in the grid-voltage-coordinate) to change Udc into Udc-reference'' MPPTer detects the maximum power …
The back stage inverter circuit adopts an improved droop control strategy to realize the inverter output voltage and the grid-side AC voltage of the same frequency and phase, and …
The scale and structure of the grid also influence the inverter''s connection methods and operational requirements. For example, in different voltage …
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