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In control mode I, the prediction and the historical operation information is ignored, and the control objective is only the voltage deviation of the pilot nodes.
1) By utilizing the wind power prediction in the ORPD strategy, the voltage deviation of the pilot nodes is improved and the WPPC can maintain sufficient VSM in each control cycle.
In control mode II, by utilizing the wind power prediction, the up-fluctuation and down-fluctuation states can be considered and therefore the voltage deviation of the pilot nodes can be guaranteed during the whole ORPD control cycle.
These studies mainly focus on the characteristics of reactive power compensation equipment in wind power plants and central substations, utilizing the operation information based on the time section that the voltage control cycle begin to decrease the power loss of WPPC [12, 13, 14] or to reduce the voltage deviation of the pilot nodes [15, 16, 17].
As indicated in Fig. 5 and Table 2, in control mode I, although the voltage control of the pilot nodes is accurate at the time section when ORPD control cycle begin, the voltage deviation of the pilot nodes cannot be guaranteed during the whole control cycle due to the fluctuation of the wind power.
In this simulation, two different ORPD modes of WPPC are utilized to compare the control performance: 1) In control mode I, the prediction and the historical operation information is ignored, and the control objective is only the voltage deviation of the pilot nodes.
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The deviation of the pilots introduced by G β,p is shown as begin{aligned} varepsilon_{beta,p}=mathbf{d}_{p}-mathbf{G}_{beta,p}mathbf{d}_{p}=mathbf{W}_{beta}tilde{mathbf{{A}}}_{p}mathbf{W}_{-beta}mathbf{d}_{p} end{aligned} (45).
Further, a relatively variable sample is assumed with a standard deviation of 3.0 units on the AUDIT-C (standard deviation in the pilot trial was 2.5).
The observed mean difference and population standard deviation from the pilot data are defined as dpilot and spilot respectively.
In this ORPD strategy, the total voltage deviation of pilot nodes of WPPC is defined as the deviation index, the total reactive power reserve of the dynamic devices of WPPC is defined as the reserve index, and the total regulating times of the discrete devices of WPPC are defined as the economic indexes.
Based on existing research [ 10, 38, 46, 47] and the pilot study, the standard deviation of the 30-second sit-to-stand measure is 3.5 sit-to-stands.
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Justyna Jupowicz-Kozak
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