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Distributed control method for household photovoltaic grid-connected inverter based on voltage sensitivity matrix

A voltage-sensitivity, decentralized control technology, applied in photovoltaic power generation, single-network parallel feed arrangement, sustainable buildings, etc., can solve problems such as not taking into account the differences of each node, and achieve simplification of control strategies, reduction of network loss, The effect of small reactive power

Active Publication Date: 2019-11-15
WUHAN UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

In the existing research, all rooftop photovoltaic grid-connected inverters use the same control parameters, without taking into account the differences of each node

Method used

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  • Distributed control method for household photovoltaic grid-connected inverter based on voltage sensitivity matrix
  • Distributed control method for household photovoltaic grid-connected inverter based on voltage sensitivity matrix
  • Distributed control method for household photovoltaic grid-connected inverter based on voltage sensitivity matrix

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Embodiment Construction

[0053] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0054] This embodiment proposes a distributed control method for household photovoltaic grid-connected inverters based on the voltage sensitivity matrix, which adopts different control parameters for photovoltaic inverters installed at different nodes, and can provide control over the operating conditions of rooftop photovoltaic inverters The strategy ensures that the node voltage of the low-voltage distribution network operates within a reasonable range, and at the same time reduces the total output reactive power of the rooftop photovoltaic inverter in the low-voltage distribution network.

[0055] First, calculate the voltage-reactive power sensitivity matrix based on the load data of the low-voltage distribution network; then calculate the influence weight of the reactive power variation of any node on the voltage of the entire low-voltage distribut...

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Abstract

The invention relates to the low voltage distribution network technology and particularly relates to a distributed control method for a household photovoltaic grid-connected inverter based on a voltage sensitivity matrix. The method comprises steps that a network structure model of the low voltage distribution network is established; voltage priority control nodes in the distribution network are selected; rooftop photovoltaic control of all voltage priority control nodes is selected as a power factor-active output control mode, and the control mode is that the reactive output starts when the active output of a photovoltaic system reaches a startup value; power factor threshold constraint conditions are determined according to the voltage priority control node's ranking in descending orderof the nodes with significant voltage influence, a voltage control model of the low voltage distribution network is constructed with the goal of minimizing the sum of the reactive power output of thephotovoltaic system at all the voltage priority control nodes, and thereby a power factor control value of the rooftop photovoltaic inverter at the various voltage priority control nodes is determined. The method is advantaged in that coordinated control of the nodes is guaranteed during distributed control, and network loss is reduced during reactive power compensation control.

Description

technical field [0001] The invention belongs to the technical field of low-voltage distribution networks, and in particular relates to a distributed control method for household photovoltaic grid-connected inverters based on a voltage sensitivity matrix. Background technique [0002] Distributed photovoltaic power generation is one of the main technical measures to further increase the penetration rate of new energy in my country. [0003] Due to the mismatch between the typical residential electricity load and the output power of the rooftop photovoltaic power generation system, the voltage of some nodes in the low-voltage distribution network may exceed the allowable upper limit during the day. Due to the high resistance-to-reactance ratio of low-voltage distribution lines, voltage regulation methods for low-voltage distribution networks can be divided into two categories: control methods based on active power curtailment and control methods based on reactive power compens...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02B10/10Y02E10/56
Inventor 唐金锐张明浩熊斌宇李旸侯慧
Owner WUHAN UNIV OF TECH
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