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Voltage frequency tracking method for distributed power grid-connected inverter protection

A distributed power supply, voltage and frequency technology, applied in the direction of regulating electrical variables, instruments, control/regulating systems, etc., can solve problems such as lack of

Inactive Publication Date: 2015-08-12
STATE GRID CORP OF CHINA +1
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  • Voltage frequency tracking method for distributed power grid-connected inverter protection
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  • Voltage frequency tracking method for distributed power grid-connected inverter protection

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[0056] The voltage frequency tracking method for distributed power grid-connected inverter protection provided by the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0057] The voltage frequency tracking method for the protection of distributed power grid-connected inverters provided by the present invention includes the following steps performed in order:

[0058] Step 1) Perform real-time sampling of the inverter port voltage in the distributed grid, and the sampling frequency is fixed at 600 Hz. The specific voltage sampling method is as follows: figure 1 shown.

[0059] Step 2) Input the above-mentioned voltage sampling value in real time into the inverter , and then perform an iterative operation and revise the frequency estimate. The flow chart of the iterative operation method is as follows: figure 2 shown.

[0060] Step 3) Send the estimated frequency value obtained in the previous ste...

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Abstract

The invention discloses a voltage frequency tracking method for distributed power grid-connected inverter protection. The method comprises steps: real-time sampling is carried out on voltage at the port of the inverter in the distributed power grid, and the sampling frequency is fixed to be 600Hz; the voltage sampling value is inputted to the inverter in real time, iterative computation is carried out, and a frequency estimation value is corrected; the frequency estimation value is sent to an inverter protection circuit in real time for participating in logic judgment, and after the system voltage frequency deviates from a normal range and certain delay is reached, the inverter protection action outlet isolates the distributed power and a main power grid system. The voltage frequency tracking method for distributed power grid-connected inverter protection has the beneficial effects that compared with the traditional Fourier principle-based frequency measurement technology, the time delay problem of frequency tracking can be solved from the aspect of the principle, tracking is stronger in real-time performance, convergence is quick and stable, and time limit requirements on inverter protection can be reliably met. As the fixed frequency is adopted for sampling, selection of the sampling frequency has little effect on calculation precision, and to a certain degree, calculation amount of the algorithm is saved.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a voltage frequency tracking method for protection of distributed power grid-connected inverters. Background technique [0002] In recent years, with the continuous progress and development of new energy technologies, distributed power sources such as photovoltaics, wind turbines, and batteries have been widely connected to the power grid system, forming a large number of power distribution networks with high penetration and bidirectional power flow. The power of the active distribution network flows in two directions, which changes the traditional power flow and fault characteristics, and poses many new challenges to the operation and maintenance of the power grid. At present, for the distribution network with large-scale distributed power access, the protection method combining inverter protection and traditional line protection is wid...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/12
Inventor 范须露李盛伟
Owner STATE GRID CORP OF CHINA
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