Direct current instruction calculation method for active secondary pulsation suppression under power grid unbalance

A technology for grid imbalance and secondary pulsation, which is applied to output power conversion devices, electrical components, etc., can solve the problems of complex control, complicated control methods, and large amount of command current calculation, so as to simplify calculation and suppress secondary pulsation. , the effect of improving the response speed and control effect

Active Publication Date: 2017-05-31
安徽奥源电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology helps reduce harmful emissions from an alternating current (AC) generator by separating out certain parts called the positive or negative sequence voltages before sending them back through it for use during operation. By calculating these currents based on their polarity, this algorithm reduces complexity while still maintaining good performance over time.

Problems solved by technology

Technological Problem addressed in this patents relates to improving the accuracy and efficiency of adjustment for electrical devices such as converters or motors when they operate with three phase AC signals. Current methods require significant computational resources due to their complexity and involve numerous loop configurations which may lead to instability issues during steady state operations.

Method used

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  • Direct current instruction calculation method for active secondary pulsation suppression under power grid unbalance
  • Direct current instruction calculation method for active secondary pulsation suppression under power grid unbalance
  • Direct current instruction calculation method for active secondary pulsation suppression under power grid unbalance

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Embodiment Construction

[0035] In this embodiment, the calculation method of the direct current command for active power secondary pulsation suppression under unbalanced power grid is carried out as follows:

[0036] Step 1. Sampling to obtain the three-phase unbalanced phase voltage E on the grid side of the PWM rectifier a ,E b and E c ;

[0037] Step 2. Use the symmetrical component method to sample the grid-side three-phase unbalanced phase voltage E a ,E b and E c Separation of positive and negative sequences according to formula (1) to obtain the positive sequence component E of the grid voltage a p ,E b p and E c p :

[0038]

[0039] in

[0040] Step 3. There is no zero-sequence component in the grid voltage in the three-phase three-wire system, then the negative-sequence component E of the grid voltage is obtained by formula (2) a n ,E b n ,E c n for:

[0041]

[0042] Step 4. Take the positive sequence phase voltage complex vector E of any phase grid side p and nega

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Abstract

The invention discloses a direct current instruction calculation method for active secondary pulsation suppression under power grid unbalance. The method is characterized by including: using a symmetrical component method to perform positive and negative sequence separation on three-phase unbalanced voltage on a grid side of a PWM (pulse width modulation) rectifier; calculating to acquire negative sequence instruction current under a three-phase stationary coordinate system; adding the negative sequence instruction current with original positive sequence instruction current to acquire actual instruction current. By the method, secondary pulsation of active power and voltage on a direct-current side of the rectifier when a power grid has unbalanced voltage is effectively suppressed, instruction current calculation is simplified, and response speed and control effect of a system are improved.

Description

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Claims

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Application Information

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Owner 安徽奥源电子科技有限公司
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