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Grid-connected inverter reactive power control method, device, system and storage medium

A power control and inverter technology, which is applied in circuit devices, AC network circuits, and single-network parallel feeding arrangements, etc. The effect of fast response to demand and improved steady-state accuracy

Active Publication Date: 2020-05-26
BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the existing methods, this application proposes a reactive power control method, device, system and storage medium for grid-connected inverters to solve the problem that the existing technology cannot guarantee the steady state of reactive power metering points responding to reactive power dispatching instructions Accuracy while meeting the technical problems of the current inverters for fast response requirements for reactive power regulation

Method used

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  • Grid-connected inverter reactive power control method, device, system and storage medium
  • Grid-connected inverter reactive power control method, device, system and storage medium
  • Grid-connected inverter reactive power control method, device, system and storage medium

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Embodiment 1

[0026] The embodiment of this application provides a grid-connected inverter reactive power control system, such as figure 2 As shown, among them, there are reactive power control nodes and reactive power metering nodes (namely figure 2 The reactive power metering point in the reactive power metering point), the transmission line between the reactive power control node and the reactive power metering node is grounded through a capacitor, specifically as figure 2 As shown, the reactive power control system of the grid-connected inverter may include:

[0027] The first collecting device (not shown in the figure), is used for collecting the reactive power value of the reactive power control node of current control period; During specific operation, this first collecting device can be arranged near the reactive power control node;

[0028] The second collection device (not shown in the figure), is used to collect the reactive power value of the reactive power metering node of ...

Embodiment 2

[0033] The flow chart of the reactive power control method corresponding to the above grid-connected inverter reactive power control device is specifically as follows image 3 shown, including:

[0034] S301. Calculate the difference between the reactive scheduling command value of the current control cycle and the reactive power value to be compared; the reactive power value to be compared includes the reactive scheduling command value of the previous control cycle of the current control cycle or the current The reactive power value of the reactive metering node of the control cycle;

[0035] S303, if the difference is greater than or equal to the preset threshold range, perform reactive closed-loop control according to the reactive power value of the reactive control node in the current control cycle;

[0036] S305. If the difference is less than the preset threshold range, perform reactive power closed-loop control according to the reactive power value of the reactive power ...

Embodiment 3

[0050] Based on the same inventive idea, such as Image 6 As shown, the embodiment of the present application provides a reactive power control device for a grid-connected inverter, Figure 2-Figure 5 The explanations of the illustrated embodiment can be applied to this embodiment, such as Image 6 As shown, the reactive power control device of the grid-connected inverter includes:

[0051] Calculation unit 601, configured to calculate the difference between the reactive scheduling instruction value of the current control cycle and the reactive power value to be compared; the reactive power value to be compared includes the previous control cycle of the current control cycle or the reactive power value of the reactive power metering node in the current control cycle;

[0052] The control unit 603 is configured to perform reactive closed-loop control according to the reactive power value of the reactive control node in the current control cycle if the difference is greater th...

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Abstract

Embodiments of the present application provide a grid-connected inverter reactive power control method, apparatus, system, and storage medium. The method comprises the following steps: calculating thedifference between the reactive power dispatching instruction value of the current control cycle and the reactive power value to be compared. The reactive power value to be compared comprises a reactive power dispatching instruction value of a previous control cycle of the current control cycle or a reactive power value of a reactive power measuring node of the current control cycle; If the difference is greater than or equal to a preset threshold range, the reactive power closed-loop control is carried out according to the reactive power value of the reactive power control node of the current control cycle. If the difference is smaller than the preset threshold range, the reactive power closed-loop control is performed according to the reactive power value of the reactive power measuringnode of the current control cycle. Embodiments of the present application can ensure the steady-state accuracy of the reactive power metering point response to the reactive power dispatch instruction, while meeting the fast response requirements of the inverter for reactive power regulation.

Description

technical field [0001] The present application relates to the technical field of grid-connected control of wind power generating sets, and in particular, the present application relates to a reactive power control method, device, system and storage medium of a grid-connected inverter. Background technique [0002] At present, wind turbines and photovoltaic power plants are basically connected to the grid using a reactive power control system and a reactive power metering system that are independent, with their own voltage, current and reactive power detection devices. The reactive power control system is integrated in the grid-connected inverter, and the corresponding reactive power is issued according to the reactive power command issued by the superior dispatcher, and the reactive power output is required to respond quickly. The reactive power metering system is an independent metering device, which can accurately measure the reactive power of the grid-connected point, as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/50
CPCH02J3/386H02J3/50Y02E10/76
Inventor 阮景锋郭锐杨志千
Owner BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD