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Pilot protection method containing multi-T-connection inverter interfaced distributed generation power distribution network

An inverter-type distributed and distributed power supply technology, applied in the direction of automatic disconnection of emergency protection devices, emergency protection circuit devices, electrical components, etc., can solve the problem that the reliability of protection action cannot be guaranteed and it is difficult to obtain distributed power supply. current, etc.

Active Publication Date: 2016-07-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For distributed power in this grid-connected mode, when a fault occurs, it is difficult for the protection on both sides of the line to obtain the fault current of the distributed power
Even if the traditional longitudinal differential protection is used, the reliability of its protection action cannot be guaranteed in the case of multiple T-connected distributed power sources

Method used

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  • Pilot protection method containing multi-T-connection inverter interfaced distributed generation power distribution network
  • Pilot protection method containing multi-T-connection inverter interfaced distributed generation power distribution network
  • Pilot protection method containing multi-T-connection inverter interfaced distributed generation power distribution network

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Embodiment

[0050] This embodiment takes figure 1 The distribution network shown is taken as an example. M and N in the figure are the head and end of the line MN respectively. and are the line currents measured by the protection devices on both sides of the line, respectively, and Respectively for the current provided by the distributed power supply, PCC 1 and PCC 2 They are the common connection points of two distributed power sources. The transmission line adopts the model LGJ-120 in actual operation, and its parameter is 0.27+j0.343Ω / km. Taking the line with two Ts connected to DG as an example, the line M-PCC 1 、PCC 1 -PCC 2 、PCC 2 - The lengths of N are 1.5, 2.5, 2km respectively; the rated capacities of DG1 and DG2 are 5MW and 3MW respectively; f 1 and f 2 They are respectively located on the line between DG1 and DG2, and on the grid connection point of DG2.

[0051] For the longitudinal protection method of a distributed power distribution network with multiple T-co...

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Abstract

The invention discloses a pilot protection method containing multi-T-connection inverter interfaced distributed generation power distribution network. The pilot protection method includes the following steps: electrifying a relay protection device; initializing line parameters; setting the practical rated power capacity; setting a constant value Iset for pilot current differential protection; acquiring a voltage phasor and a current phasor; acquiring an active power; calculating the sum of the output power of the distributed generation; calculating an active reference power for a distributed generation control system; calculating the positive sequence voltage of a point of common coupling PCC to acquire the practical output current; according to the current phasor, calculating the sum of the practical output current, and calculating a total differential current Delta I of the line; determining whether the Delta I is greater than Iset; and determining that a fault in the area occurs and starting a protective action if so, or expressing that no fault occurs in the area if not. The pilot protection method containing multi-T-connection inverter interfaced distributed generation power distribution network is suitable for a line containing an arbitrary number of T distributed generation, and is not influenced by a fault type, a transition resistor, distributed generation capacity and other factors, thus being high in applicability and reliability and having high practicability during the engineering practice process.

Description

technical field [0001] The invention relates to a relay protection method for a power system, in particular to a longitudinal protection method for a distributed power distribution network with multiple T-connection inverters. Background technique [0002] In recent years, with the increasing energy crisis and people's awareness of environmental protection, inverter-type distributed power generation represented by wind power and photovoltaic power generation has played an increasingly important role in modern power grids. However, after distributed power sources are widely connected to the distribution network, the dispersion of their access locations causes the distribution network to evolve from a single-ended radiation system to a multi-source network system. If a fault occurs, the distribution network system will be short-circuited. Current levels and distribution paths are fundamentally changed. Furthermore, due to the fluctuation and intermittent nature of the distrib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/28H02H3/26
CPCH02H3/26H02H7/28
Inventor 王钢韩博文蔡颖倩李海锋
Owner SOUTH CHINA UNIV OF TECH
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