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Detection method of real-time voltage vectors in energy feedback unit

A real-time voltage and energy feedback technology, applied in the direction of measuring electrical variables, measuring current/voltage, measuring devices, etc., can solve problems such as control influence, inverter overcurrent, phase and amplitude instability, etc., and achieve strong suppression ability Effect

Inactive Publication Date: 2010-12-01
雷富特节能科技(上海)有限公司
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Problems solved by technology

[0004] Under normal circumstances, this method can obtain accurate phase and amplitude of three-phase voltage, but it is very sensitive to the unbalance degree and harmonics of the three-phase power grid. In general, the unbalance and harmonics of the three-phase power grid are Very common, in this case, the phase and amplitude will be greatly unstable, which will have a great impact on the control, and may cause overcurrent or damage to the inverter in severe cases

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  • Detection method of real-time voltage vectors in energy feedback unit
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  • Detection method of real-time voltage vectors in energy feedback unit

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with accompanying drawing.

[0027] Such as Figure 2-4 As shown, the detection method of the real-time voltage vector in the energy feedback unit includes

[0028] 1) Sampling the three-phase AC voltage U of the power grid abc ;

[0029] 2) to U abc Carry out CLARK transformation to get U in the two-phase stationary coordinate system αβ ;

[0030] 3) to U αβ Perform the PARK transformation of the positive initial θ angle to obtain the positive sequence voltage work component U in the rotating coordinate system d +, positive sequence reactive component U q +, while U αβ Perform the PARK transformation of the negative initial θ angle to obtain the negative sequence voltage work component U in the rotating coordinate system d -, Negative sequence reactive component U q -;

[0031] 4) Respectively for U d +, U q +, U d -, U q -Twice the notch wave of the initial ω to remove the AC value of ...

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Abstract

The invention relates to a detection method of real-time voltage vectors in an energy feedback unit, which comprises the following steps: carrying out real-time decomposition and correction on positive and negative sequence components of a power grid, carrying out adaptive notch on the positive sequence component obtained by decomposition, then carrying out decoupling, taking out secondary ripple, further carrying out PI control, then carrying out integration for obtaining the voltage phase, and simultaneously outputting the amplitude of three-phase voltage. Compared with the prior art, the detection method can detect the voltage phase and simultaneously detect the voltage amplitude in a real-time manner, simultaneously detect the voltage and the amplitude of the negative sequence component for facilitating the negative sequence control, have strong capability of inhibiting the imbalance of the three-phase power grid, accurately detect the amplitude and the phase of the positive sequence component within 0.2ms for the added 30% of the negative sequence component and have strong harmonic suppression capability.

Description

technical field [0001] The invention relates to energy feedback technology, in particular to a method for detecting real-time voltage vectors in an energy feedback unit. Background technique [0002] The energy feedback unit is a device that converts DC power into AC power and sends it back to the grid based on VSR control technology. At present, there are certain applications, such as solar power generation, direct-drive wind power generation and so on. [0003] Since the energy feedback unit needs to return DC power to the grid, it is necessary to accurately measure the voltage, frequency, and phase parameters of the grid. Only by accurately sampling the above parameters can the device accurately, coordinate and synchronously transmit DC power to the AC grid. . For general power grid parameter detection methods, see figure 1 . [0004] Under normal circumstances, this method can obtain accurate phase and amplitude of three-phase voltage, but it is very sensitive to the...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 梁光耀
Owner 雷富特节能科技(上海)有限公司
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