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A mixed island signal transmission method of switching value, digital value and analog value

A digital signal and switching signal technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problem of unable to meet the safe and stable operation of power station equipment, and achieve the effect of satisfying safe and stable operation, flexible transmission mode, and short transmission time.

Active Publication Date: 2017-05-10
CHINA YANGTZE POWER
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AI Technical Summary

Problems solved by technology

If such a transmission method is adopted, due to problems such as the monitoring sampling period, the communication time is as long as 2-3 seconds, which cannot meet the safe and stable operation of power station equipment during island operation

Method used

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  • A mixed island signal transmission method of switching value, digital value and analog value

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Embodiment 1

[0026] A hybrid islanding signal transmission method of switching, digital and analog values, the method is to use the optimal transmission method between the converter station and a certain power station for the signal judged by the island discrimination device of a certain converter station, such as figure 1 shown, including the following steps:

[0027] Step 1: The islanding status and networked operation signals judged by the islanding identification device of the converter station are transmitted to the stabilizing device of the converter station in the form of switches through cables. The islanding identification device of the converter station is the master, and the islanding identification device of the power station is the slave.

[0028] The islanding identification device of the converter station mainly uses the switch operation status signal collected by itself and provided by the islanding identification device of the power station to determine whether the power s...

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Abstract

The invention provides a switch, digital and analog mixed island signal delivery method. The method comprises the steps that island state and network operation signals which are determined by a converter station island discriminating device are delivered to a converter station secure device through a cable in a switch manner; the converter station secure device receives the signals, and determined island state, network operation and direct current outage signals are delivered to a power station secure device through an optical fiber in a digital manner; the power station secure device converts the received digital signals into switch signals, and delivers the switch signals to a power station island information delivery device through the cable; and the digital signals received by the power station island information delivery device are delivered in two manners. A power station island actuator converts the received digital signals into switch signals, and delivers the switch signals to a power station unit excitation regulator and a unit speed governor through the cable. A power station switch station monitoring system converts the received switch signals into digital signals, and delivers the digital signals to a power station monitoring host computer through the optical fiber. According to the invention, the island signals are delivered to the speed governor and excitation, monitoring and other systems; quick response is realized; and safe and stable operation of each system is ensured.

Description

technical field [0001] The invention discloses a mixed island signal transmission method of switch quantity, digital quantity and analog quantity, and relates to the monitoring field of converter station and power station. Background technique [0002] The generator or power station is directly connected to the regional large power grid for operation, which is referred to as the network operation mode for short. At this time, the frequency and voltage of the regional power grid are relatively stable, the unit load adjustment is convenient, and the scheduling is flexible. However, the configuration of AC switch breaking capacity, protection mode, and security measures is complex. The generator or power station is not directly connected to the main power grid, but is connected to a regional load operation, referred to as the island operation mode, which is a broad definition of the island operation mode. The island operation mode mentioned in DC transmission only refers to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
Inventor 李光耀沈芳刘绍新陈小明封孝松
Owner CHINA YANGTZE POWER
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