Multi-direct-current frequency limiter based on rated capacity adjustment

A rated capacity, multi-DC technology, applied in the power transmission AC network, reducing/preventing power oscillation, etc., can solve the problems of deteriorating system frequency stability, inconsistent modulation, inconsistent logic and parameters, etc., to maintain stability and change trends. , the effect of precise modulation

Inactive Publication Date: 2018-02-02
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The current starting point of the Yunnan power grid has its own frequency limiter for each DC circuit. Each frequency limiter responds to the system frequency and calculates the DC modulation amount. Because the DC in the system is provided by different manufacturers, the logic and parameters of the frequency limiter control link are inconsistent, resulting in The input frequency of each DC frequency limiter is the same, but the modulation value of each DC output is inconsistent. In severe cases, there are multiple DCs with opposite modulation trends, which may degrade the system frequency stability.

Method used

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  • Multi-direct-current frequency limiter based on rated capacity adjustment
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  • Multi-direct-current frequency limiter based on rated capacity adjustment

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Embodiment 1

[0016] like figure 1 and figure 2 As shown, a multi-DC frequency limiter based on rated capacity adjustment, which includes a frequency measurement module, a distribution module, and a communication module, the output of the frequency measurement module is connected to the input of the distribution module, and the output of the distribution module is connected to the The input end of the communication module is bidirectionally connected, wherein the distribution module is provided with an adjustment module according to the rated capacity, and the adjustment module according to the rated capacity distributes the total amount of DC modulation calculated by the distribution module according to the DC rated capacity and outputs it to the communication module.

[0017] The frequency measurement module measures the system frequency and transmits it to the distribution module; when the system frequency is within the dead zone range (such as 50±0.05Hz), the distribution module output...

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Abstract

The invention belongs to the field of direct current control, and particularly relates to a multi-direct-current frequency limiter based on rated capacity adjustment. Multiple direct currents are connected to the same frequency limiter. The frequency limiter obtains a multi-direct-current total modulation amount by responding to the system frequency, and the total modulation amount is distributedamong the direct currents according to the rated capacity of each direct current. Each direct current modulation amount is obtained based on the same set of control parameters, so that the change trend of each direct current power is the same, and the stability of the system frequency is favorably maintained.

Description

technical field [0001] The invention belongs to the field of direct current control, in particular to a multi-direct current frequency limiter adjusted based on rated capacity. Background technique [0002] At present, the Yunnan Power Grid and the main grid of the Southern Power Grid have realized asynchronous operation. The starting point of each DC circuit that Yunnan undertakes to transmit electricity from west to east is located in the Yunnan Power Grid, and the landing point is located in the main grid of the Southern Power Grid. The starting point and the landing point are located in two different synchronous systems. If faults such as unit tripping or DC blocking occur in Yunnan Power Grid, the internal power of Yunnan Power Grid will be unbalanced, and the system frequency will start to deviate from the reference frequency. When the system frequency exceeds the range of the DC frequency limiter, the DC frequency limiter starts to increase or decrease the DC power by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/24
CPCH02J3/24H02J3/36Y02E60/60
Inventor 杜斌刘文涛梁俊辉邓旭阳刘之亮欧昌岑
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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