A low-voltage three-phase load unbalance adjustment system and method
A technology of load imbalance and adjustment method, which is applied in the direction of eliminating/reducing asymmetry in multi-phase networks and reducing the asymmetry of multi-phase networks, and can solve the problem of insufficient control of commutation risks on the user side and three-phase load unbalance tolerance Low-level problems, to achieve the effect of avoiding frequent commutation, reducing risks, and high tolerance
Active Publication Date: 2021-10-15
STATE GRID ZHEJIANG TONGXIANG POWER SUPPLY
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The technical problem to be solved by the present invention is: the current low-voltage three-phase load unbalance adjustment method has insufficient control of user-side commutation risk and low tolerance to short-term three-phase load unbalance
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0026] The specific embodiments of the present invention will be further specifically described below through specific embodiments in conjunction with the accompanying drawings.
[0027] Such as figure 1 As shown, it is a flow chart of the low-voltage three-phase load unbalance adjustment method, including the following steps: A1) set the time t of the day 0 To adjust the time point, set the three-phase load imbalance threshold β x ; A2) The control terminal collects and stores the three-phase current at intervals T, and the remote commutation switch records the load current connected to it at intervals T and sends it to the control terminal, and enters into step A3 after collecting for 24 hours; A3) respectively Calculate the three-phase load unbalance degree collected for the ith time Then calculate the average value of all collected three-phase load unbalance as the three-phase load unbalance A4) If The control terminal controls the action of the remote commutation s...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to the field of power systems, in particular to a low-voltage three-phase load unbalance adjustment method and system. A method for adjusting low-voltage three-phase load unbalance, characterized in that it comprises the following steps: A1) setting the adjustment time point, setting the threshold value β x ; A2) The control terminal collects the three-phase current at an interval T, and the remote commutation switch records its connected load current at an interval T and sends it to the control terminal. After collecting for 24 hours, enter step A3; A3) Calculate the unbalanced degree of the three-phase load A4) If the control terminal controls the action of the remote commutation switch, adjust the three-phase load distribution. The substantive effect of the present invention is: high tolerance to short-term three-phase load imbalance, avoiding frequent phase change on the user side caused by short-term three-phase load imbalance, and performing phase change at the moment when the historical average load is the smallest , to minimize the risk of commutation on the user side.
Description
technical field [0001] The invention relates to the field of power systems, in particular to a low-voltage three-phase load unbalance adjustment system and method. Background technique [0002] At present, most distribution transformers in urban and rural distribution networks use three-phase transformers, and the three-phase load at the transformer outlet should be symmetrical in theory. Single-phase load, with the rapid development of rural economy, farmers' life is generally improved, high-power household appliances (air conditioners, electric heaters, induction cookers, microwave ovens, electric water heaters, single-phase water pumps, etc.) are increasing, and the load gap between users is widening. At the same time, rural residents build a large number of new houses, and the load migration causes changes in the load distribution of the entire station area. Irregularity and unpredictability of user load imbalance lead to long-term imbalance of three-phase load in low-v...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/26
CPCH02J3/26Y02E40/50
Inventor 朱晟宇金伟强顾培生姚星良陆伟杰徐天相
Owner STATE GRID ZHEJIANG TONGXIANG POWER SUPPLY