Support of grid voltages with asymmetrical reactive currents in case of grid errors

Uphues, Andreas; Notzold, Kilian; Wegener, Ralf; Soter, Stefan; Griessel, Richard

doi:10.1109/icit.2013.6505945

Cited by 3 publications

(6 citation statements)

References 3 publications

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“…3 (see point B). This minimum injection of reactive current results in lower V max , as predicted by (23)- (25). On the contrary, the reactive current takes the maximum value in the lowest power production scenario (see Fig.…”

Section: Voltage Support Propertiesmentioning

confidence: 58%

“…It has been shown by the experimental validation that the proposed control incorporates all the desired characteristics specified by the control objectives. [3,4] no no yes no no not specified [18,24] no yes yes no no not specified [25] yes no yes no no not specified [9] yes yes yes no no any value [26] no yes yes yes no any value [33] no yes yes no no any value [36] no no yes no yes X /R ≪ 1 [5]…”

Section: Resultsmentioning

confidence: 99%

“…In Fig. 7, the slope of the system lines (blue and orange) depends on the grid impedance L g ; see (23)- (25). For lower values of L g , the slope of both lines increases what brings the operating points closer and, therefore, the range of k is reduced.…”

Section: Design Guidelinesmentioning

confidence: 97%

See 2 more Smart Citations

Avoiding overvoltage problems in three‐phase distributed‐generation systems during unbalanced voltage sags

Castilla¹,

Camacho

Miret³

et al. 2020

IET Power Electronics

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During voltage sags, distributed generation systems must fulfil specific grid-code requirements for reactive current injection. This ancillary service can produce overvoltage problems in networks operating in unbalanced conditions when the amplitude of one of the phase voltages is higher than the others and a balanced reactive current is injected through a large grid impedance. This paper proposes a control scheme to avoid these overvoltage problems, thus reducing the risk of cascade disconnection that this incident may produce. The derivation of the control scheme starts from the flexible oscillating-power control, introduces the necessary modifications so that this control meets the grid-code requirements for current injection and combines it with a slope voltage control to achieve a good voltage regulation. A theoretical analysis is included to determine the expressions that quantify the voltage support characteristics of the proposal. Finally, selected experimental results are reported to validate the characteristics of the proposed control. Auto-generated PDF by ReView IET Power Electronics Overvoltage v2 paper.docx M ainDocument

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Section: Voltage Support Propertiesmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Avoiding overvoltage problems in three‐phase distributed‐generation systems during unbalanced voltage sags

Castilla¹,

Camacho

Miret³

et al. 2020

IET Power Electronics

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show abstract

“…In case of a symmetrical fault, which is a voltage dip in all three phases, the requested reactive current can rise up to 100 % of the nominal current of the wind turbine. By By feeding symmetrical reactive currents in case of an asymmetrical grid fault special attention has to be paid to the voltages in the undistorted phases [6]. In a similar manner the reactive power supports the grid voltage in the distorted phase, the voltage in the undistorted phase will increase reasoned by the feed-in of the reactive current.…”

Section: Grid Code Requirementsmentioning

confidence: 99%

“…The grid fault is detected by analyzing the individual phase voltages. Furthermore, to prevent an increase of the voltage in the undistorted phase in case of an asymmetrical grid fault, asymmetrical reactive current has to be fed into the grid [6].…”

Section: Grid Code Requirementsmentioning

confidence: 99%

SOGI based grid fault detection for feeding asymmetrical reactive currents to fulfill LVRT requirements

et al. 2013

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Due to the increasing wind power penetration, grid codes of system operators require low voltage ride through (LVRT) capability for wind turbines (WT). Additionally the WT has to support the power system stability in LVRT cases by supporting the grid with reactive power. The amount of reactive power feed-in depends on the type of grid fault and the depth of the voltage dip. Therefore this paper shows a reliable grid voltage monitoring consisting on a second order generalized integrator (SOGI) structure. The resulting phase locked loop (PLL) is tolerant against grid faults and the amplitudes and phase angles of the individual phase voltages are detected.

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Individual Phase Current Control With the Capability to Avoid Overvoltage in Grid-Connected Photovoltaic Power Plants Under Unbalanced Voltage Sags

Mirhosseini

Pou

Agelidis

2015

IEEE Trans. Power Electron.

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Support of grid voltages with asymmetrical reactive currents in case of grid errors

Cited by 3 publications

References 3 publications

Avoiding overvoltage problems in three‐phase distributed‐generation systems during unbalanced voltage sags

Avoiding overvoltage problems in three‐phase distributed‐generation systems during unbalanced voltage sags

SOGI based grid fault detection for feeding asymmetrical reactive currents to fulfill LVRT requirements

Individual Phase Current Control With the Capability to Avoid Overvoltage in Grid-Connected Photovoltaic Power Plants Under Unbalanced Voltage Sags

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