Method for detecting high voltage frequency converter electric network voltage phase

Abstract

The invention discloses a method for testing the electricnetwork pressure phase of the high pressure transducer, comprising directly inputting the pressure at the high pressure side of the transducer by the main control system to detect and process; transmitting the signal containing the electricnetwork pressure phase information to the control chip of each power unit optical fiber; performing the calculation of the control algorithm by the control chip of each power unit based on the electricnetwork pressure phase information received from the optical fiber. The high pressure transducer withenergy feedback function without network side reactor after abolishing the network side reactor, still reliably operates at high performance, therefore the cost, volume and weight of the transducer can be greatly reduced.

Description

technical field [0001] The invention relates to a method for detecting the voltage phase of a grid, in particular, the invention relates to a method for detecting a three-phase phase connected to a multi-level high-voltage inverter connected in series with a power unit without a grid-side reactor and with an energy feedback function. Method of grid voltage phase. Background technique [0002] With the development of power electronics technology, high-voltage frequency converters, as the main means of energy saving and consumption reduction, have been widely used in various fields of the national economy, such as metallurgy, petrochemical, water supply, electric power and other industries, and are playing an increasingly important role. . [0003] Among the high-voltage frequency converters with many topological structures, the power unit series multi-level high-voltage frequency converter shown in Figure 1, because of its strong voltage output capability, has little harmoni...

AI Technical Summary

Problems solved by technology

During the development process, the inventors found that: after canceling the grid-side reactor between the grid side of each power unit 1 and the secondary winding of the transformer 2, the grid side of each power unit is its controllable rectifier bridge part The output side of the power supply, where the voltage is the output voltage of the controllable rectifier bridge part of the power unit rather than the grid voltage, the control part of each power unit cannot measure the phase and amplitude of the grid voltage, so the control part of each control unit cannot measure The calculation of the control algorithm can not control the on and off of each switching element that constitutes the rectifier bridge, and cannot realize energy feedback

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