Three-phase unbalanced current compensation device and method
A technology of three-phase current and balanced current, which is applied in the direction of circuit device, multi-phase network asymmetry reduction, multi-phase network elimination/reduction of asymmetry, etc. It can solve the problems of inability to operate, reduce commutation effectiveness, power supply security, etc. , to achieve the effect of wide applicability
Pending Publication Date: 2020-12-04
NANJING APAITEK TECH
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Problems solved by technology
The existing problem is: when the communication between the commutation switch and the management terminal is lost, it cannot operate, which reduces the effectiveness of the commutation and brings about power supply security problems
Method used
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Embodiment Construction
[0029] The present invention will be specifically described below in conjunction with the accompanying drawings.
[0030] as attached figure 1 As shown, a three-phase unbalanced current compensation device includes a main control unit arranged on the low-voltage side of the distribution transformer and a commutation switch on the load side; The main switch, the three-phase current and voltage acquisition and conversion circuit, the main controller, and the wireless communication module; the control circuit of the main switch, the three-phase current and voltage acquisition and conversion circuit, and the wireless communication module are all connected to the main controller; The main control unit realizes the communication with the phase-change switch through the wireless communication module; the phase-change switch includes a load-side three-phase current and voltage transformer and its signal conversion circuit, a single-chip microcomputer, a communication module, and a swi...
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The invention discloses a three-phase unbalanced current compensation device and method, and the method comprises the steps of collecting and converting the three-phase current and voltage of a low-voltage side of a distribution transformer through a three-phase current and voltage collection and conversion circuit of a main control unit, and calculating the unbalance degree of the three-phase current at the low-voltage side of the distribution transformer according to preset time; comparing with a preset imbalance degree triggering condition; if the acquired current and voltage data information of a phase-change switch of each load under the distribution transformer is acquired, judging whether the communication of the phase-change switch at each load side is acquired or not; if the acquired data acquired by a three-phase switch connected with the load side is calculated and a commutation regulation strategy is formed, issuing a control command to the related commutation switch; and enabling the phase-change switch at the load side to perform phase-change action according to the received instruction. According to the invention, the problem of power supply safety caused by commutation effectiveness can be effectively reduced.
Description
technical field [0001] The invention relates to the electrical field, in particular to a three-phase unbalanced current compensation device and method. Background technique [0002] The three-phase current unbalance phenomenon means that the magnitude of the three-phase current is asymmetrical, and its causes can be summarized as accidents and normality. The former refers to the failure of one or two phases in the three-phase power system, resulting in three-phase imbalance; the latter refers to the fact that a large number of user loads are single-phase loads, and the power consumption is not simultaneous, and the distribution system is prone to three-phase Phase imbalance, especially for loads such as electrified railways, whose traction load is a high-power load with single-phase movement and frequent amplitude changes. balance. The traditional compensation measure is that the power distribution company tries to make the loads of each phase symmetrical according to the ...
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IPC IPC(8): H02J3/26H02J3/12H02J13/00
CPCH02J3/26H02J3/12H02J13/00022Y02E40/50Y04S40/126Y02E60/00Y02B90/20
Inventor 张明林志颖张勇仇志凌芮国强
Owner NANJING APAITEK TECH