Relay protection method and device of power distribution network containing distributed power supply
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A relay protection device and distributed power supply technology, which is applied in the direction of emergency protection circuit device, measuring device, measuring power, etc., can solve the problems of high automation degree of distribution network and difficult realization of distribution network
Inactive Publication Date: 2016-05-04
STATE GRID SHANDONG ELECTRIC POWER +1
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[0004] However, the above-mentioned scheme requires the help of a complete communication network, which requires a high degree of automation of the distribution network, and it is difficult to realize the distribution network in remote areas with a low degree of automation.
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Embodiment 1
[0051] This embodiment provides a distribution network relay protection method with distributed power sources, such as Figure 1A shown, including the following steps:
[0052] S1: Equivalent the load at the distributed power supply and its access point, and obtain the equivalent circuit of the downstream line of the protected line.
[0053] For example, if Figure 1B As shown, a distribution line is connected from the substation with four nodes A, B, C, and D. Node A is connected to the substation, node B is connected to distributed power source 1 and load 1, and node C is connected to distributed power source 2. And load 2, node D is connected to load 3, and the DE section represents node D to the end of the line. Assuming that the line to be protected is the BC section, when a fault F1 occurs on the line in the BC section, the main protection of the line is required to cut off the line.
[0054] According to this embodiment, the calculation of the main protection current ...
Embodiment 2
[0076] This embodiment provides a distribution network relay protection device with distributed power sources, such as Figure 2A As shown, it includes an acquisition unit 10 , a first calculation unit 20 and a first setting unit 30 .
[0077] The acquisition unit 10 is configured to perform an equivalent on the load at the distributed power source and its access point, and acquire an equivalent circuit of the downstream line of the protected line.
[0078] The first calculation unit 20 is used to calculate the main protection current setting value of the protected line according to the equivalent circuit.
[0079] The first setting unit 30 is configured to set the main protection current setting value as the action current value of the overcurrent protection device of the protected line.
[0080] As a preferred implementation of this embodiment, such as Figure 2B As shown, the acquisition unit 10 includes a first equivalent subunit 11 , a second equivalent subunit 12 and a...
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Abstract
The invention relates to a relay protection method and device of a power distribution network containing a distributed power supply. The relay protection method comprises the following steps of carrying out equivalence on the distributed power supply and a load at an access point of the distributed power supply to acquire an equivalent circuit of a downstream circuit of a protected circuit; calculating a main protective current setting value of the protected circuit according to the equivalent circuit, and setting the main protective current setting value as an action current value of an overcurrent protection device of the protected circuit; calculating a backup protection current setting value of a downstream section adjacent to the access point of the distributed power supply; and setting the action current value of the overcurrent protection device of an upstream section adjacent to the access point of the distributed power supply as the backup protection current setting value after prolonging a predetermined time interval when the overcurrent protection device of the downstream section adjacent to the access point of the distributed power supply does not act. By the relay protection method, a perfect communication network is not needed, the influence of the distribution power supply on relay protection is eliminated, and the relay protection circuit setting value can be automatically adaptive to an access situation of the distributed power supply. The relay protection method is simple and practical and is simple in calculation.
Description
technical field [0001] The invention relates to the technical field of relay protection, in particular to a method and device for relay protection of a distribution network including a distributed power supply. Background technique [0002] The rapid development of distributed power generation technology makes the grid-connected capacity of distributed power generation more and more large, and the impact on the power grid system cannot be ignored. The access of distributed power sources changes the structure of the original power grid system, which causes changes in the protection detection current. In addition, due to the influence of weather and other factors, the randomness of distributed power generation access to the grid system is relatively large, which is not convenient for unified scheduling, which brings great difficulties to the configuration and setting of relay protection. [0003] The existing relay protection scheme for the distribution network with distribut...
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