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Interphase energy balance device

A technology of energy balance and pulse width modulation, which is applied in the direction of reducing the asymmetry of the multi-phase network, eliminating/reducing the asymmetry of the multi-phase network, etc., can solve the problem that the three-phase power supply load balance cannot be dynamically maintained, and achieve enhanced line energy transmission ability, reduce line loss, and increase the effect of power supply safety factor

Inactive Publication Date: 2015-01-21
HARBIN TIANHUA HONGDA ENERGY TECH DEV
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Problems solved by technology

[0003] In order to overcome the problem that the existing technology cannot dynamically maintain the load balance of the three-phase power supply, the present invention provides a device that can automatically maintain the three-phase load balance of the power transmission line

Method used

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Embodiment Construction

[0018] exist figure 1 The three voltage transformers and three current transformers in the middle convert the voltage and current of the three-phase line into weak electric signals, which are converted into voltage signals suitable for the input range of the A / D converter through the signal conditioning circuit, and the A / D converted Data, the load condition and voltage phase of each phase can be calculated by formula 1-4. Accordingly, the DSP processor controls the PWM circuit to output corresponding signals, drives three groups of six high-power transistors through the control drive circuit, and generates amplitude and phase fit figure 2 (in the case of active power absorbed by the compensation side) or image 3 (active power output on the compensation side) signal, the active power is absorbed by the phase with low load and output to the phase with high load. So that the three-phase transmission line achieves load balance.

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Abstract

The invention discloses a device capable of keeping interphase energy balance. The device is mounted between a power transmission line and an electricity load. The device generates a sine wave with the same frequency as a power supply line side and with an amplitude and a phase meeting specific requirements by measuring a power load per phase, and an energy transfer module in the device absorbs energy from a power supply phase with a lower load to supply the energy to a power supply phase with a higher load, so that the interphase energy balance of a power supply line is achieved.

Description

technical field [0001] The invention relates to energy balance control among three phases of electric transmission lines. Background technique [0002] In three-phase power transmission, due to the unbalanced load, there will be differences in the energy transmitted between the phases. In extreme cases, when the total transmission power of the three phases does not exceed the limit, the current of a certain phase exceeds the limit, thereby affecting the line safety and increasing the line loss. In order to achieve three-phase load balance, the existing method is to adjust the load artificially, and switch the load on a phase with a large current to a phase with a small current. However, due to the dynamic nature of load usage, there will still be load imbalance. Contents of the invention [0003] In order to overcome the problem that the existing technology cannot dynamically maintain the load balance of the three-phase power supply, the present invention provides a devi...

Claims

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Application Information

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IPC IPC(8): H02J3/26
CPCY02E40/50H02J3/26
Inventor 张伟
Owner HARBIN TIANHUA HONGDA ENERGY TECH DEV
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