Three-phase Load Unbalance Intelligent Balance Adjustment Method
A technology of load imbalance and balance adjustment, which is applied in the direction of reducing the asymmetry of the multi-phase network and eliminating/reducing the asymmetry of the multi-phase network. It can solve the problems that the three-phase load imbalance cannot be effectively eliminated, and achieve convenient application Effect of preventing low voltage phenomenon and efficient operation
Active Publication Date: 2018-05-22
STATE GRID CORP OF CHINA +2
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[0007] However, the reactive power compensation control strategy cannot effectively eliminate the three-phase load imbalance in the power supply system with serious three-phase load imbalance. Balance adjustment compensation is invalid
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[0038] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0039] Such as image 3 with Figure 4 , the reference signs in the figure are represented as: L1, L2, L3, L4, L5 are intelligent phase selection switches.
[0040] figure 1 It is a flowchart of an embodiment of the three-phase load imbalance intelligent balance adjustment method of the present invention, figure 2 It is a flow chart of step S4 of an embodiment of the three-...
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The three-phase load imbalance intelligent balance adjustment method provided by the present invention includes the following steps: S1, setting the detection time interval and the reference value of the current unbalance degree; S2, detecting the phase current of the three phases at the output end of the distribution transformer, detecting the The load current at the output end of the phase switch; S3, calculate the current unbalance degree at the output end of the distribution transformer according to the phase current; S4, within the same time interval, and the current unbalance degree is greater than the reference value of the current unbalance degree, then calculate according to the phase current and load The current determines the load adjustment object, otherwise wait for the next time interval; S5, the intelligent phase selection switch adjusts the phases connected to the three-phase four-wire power supply network according to the adjustment object, and returns to step S2. The invention can effectively balance and adjust the unbalanced three-phase loads caused by active power loads or multiple single-phase loads, promote the normal and effective operation of the three-phase four-wire power supply network, and at the same time prevent Low voltage phenomenon caused by balance.
Description
technical field [0001] The invention relates to the technical field of electric low-voltage power distribution systems, in particular to an intelligent balance adjustment method for unbalanced three-phase loads. Background technique [0002] The three-phase four-wire power supply mode is usually adopted in the low-voltage distribution network system, and the three-phase four-wire system specifically includes: three lines represent the three phases A, B, and C, and the other is the neutral line N. [0003] Usually, a large number of single-phase loads are connected in the three-phase four-wire power supply network, and different single-phase loads may be connected to different phases, and there are certain differences between each single-phase load, for example, due to different The habit of electricity consumption makes some single-phase loads have larger power consumption, while some single-phase loads consume less power, which makes the problem of unbalanced load among the...
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IPC IPC(8): H02J3/26
CPCY02E40/50
Inventor 韩俊玉高月春马维青
Owner STATE GRID CORP OF CHINA