Three-phase current balance adjustment system of electric energy adjusting and electricity saving device
A power-saving device, three-phase current technology, applied in harmonic reduction devices, AC network voltage adjustment, AC network to reduce harmonics/ripples, etc. Efficiency and other issues to achieve the effect of reducing current and line loss
Inactive Publication Date: 2011-11-23
JIANGSU FANGCHENG ELECTRIC SCI & TECHCO
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Problems solved by technology
[0002] The three-phase load of the low-voltage power grid may be unbalanced due to various reasons, and even the unbalanced degree is very serious
Unbalanced three-phase loads cause harm to low-voltage power grids, distribution transformers, and 6-10kV high-voltage lines, and have a great impact on the safe power supply of power supply companies to reduce line losses and the safe use of electricity by users
[0004] (1) Cause additional heating and vibration of the rotating electrical machine, endangering its safe operation and normal output;
[0005] (2) Cause a variety of protection malfunctions with negative sequence components as the starting element, posing a serious threat to the safe operation of the power grid;
[0006] (3) Reduce system capacity utilization, increase system network loss, and reduce power grid energy transmission efficiency;
[0007] (4) The unbalanced three-phase load will shorten the life of the transformer and increase the loss due to overheating of a certain phase;
[0008] (5) The neutral line in the distribution network is generally thin. When the three-phase load is unbalanced, the current in the neutral line is very large, and the heating of the neutral line is serious, which may cause a fire or even blow the neutral line
[0011] The control method of this compensation method is simple, and it can only be applied to a system with basically balanced three-phase loads. For a three-phase unbalanced system, good compensation cannot be achieved due to the different reactive power of each phase.
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[0033] see figure 1 , figure 2 and image 3 , figure 1 for the present invention based on , The principle diagram of the harmonic detection method of the operation mode signal detection. figure 2 for the present invention based on , Schematic diagram of the harmonic detection method in the operation mode. image 3 It is a structural principle diagram of the three-phase four-wire system APFV system of the present invention. Depend on figure 1 , figure 2 and image 3 It can be seen that the three-phase current balance adjustment system of the electric energy regulating and saving device of the present invention includes a main circuit and a control system. The main circuit adopts a three-phase full-bridge inverter structure, and the DC side is a capacitor. This structure can eliminate zero sequence component harmonic current to realize asymmetric control; the control system is composed of two parts, one is to detect the harmonic signal, and the other is to gene...
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The invention relates to a three-phase current balance adjustment system of an electric energy adjusting and electricity saving device, wherein the system comprises a main circuit and a control system; a three-phase full-bridge inverter structure is adopted for the main circuit, and a direct current side is provided with a capacitor; and the control system consists of two parts, namely a harmonic wave signal detection system and a compensation current or voltage system. According to the invention, favorable compensation can be realized for the three-phase unbalance system, and compensation is implemented for unbalance active current.
Description
(1) Technical field [0001] The invention relates to a three-phase current balance regulation system of an electric energy regulating and saving device. Widely used in low-voltage three-phase four-wire urban civil power grids, some industrial power grids and agricultural power grids, especially suitable for improving power quality problems caused by harmonics and unbalanced three-phase loads. It belongs to the technical field of power electronics. (2) Background technology [0002] The three-phase load of the low-voltage power grid may be unbalanced due to various reasons, and even the unbalanced degree is very serious. Unbalanced three-phase loads cause harm to low-voltage power grids, distribution transformers, and 6-10kV high-voltage lines, and have a great impact on the safe power supply of power supply companies to reduce line losses and the safe use of electricity by users. [0003] Three-phase unbalance means that the three-phase voltage or current contains negative-...
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Login to View More IPC IPC(8): H02J3/18H02J3/01H02J3/12
CPCY02E40/30Y02E40/40
Inventor 张建兴胡永生
Owner JIANGSU FANGCHENG ELECTRIC SCI & TECHCO