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Apparatus and method for low-cost control of voltage sag and short-term interruption of power grid

A grid voltage, low-cost technology, applied in the field of distribution network, can solve the problems of large energy storage capacity configuration, high energy consumption and maintenance costs, and difficult promotion, and achieves reduction in overall volume and cost, overall cost reduction, and reduction The effect of design cost

Active Publication Date: 2019-01-01
NANJING HEXI ELECTRIC CO LTD
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AI Technical Summary

Problems solved by technology

The real-time online series compensation method AVC compensates the voltage, no energy storage device is required, the energy consumption is extremely low, and the cost is also low. It can cope with frequent and mild voltage dips. Equipment fails to meet compensation requirements
The off-line parallel inverter compensation method DVR includes an energy storage device. Through the inverter voltage method, a wide range of deep compensation can be achieved, but limited by its energy storage capacity, it is not suitable for frequent voltage drops, and it needs to face high energy consumption and Maintenance cost, energy storage capacity needs to be configured relatively large, investment cost is high, and promotion is difficult

Method used

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  • Apparatus and method for low-cost control of voltage sag and short-term interruption of power grid
  • Apparatus and method for low-cost control of voltage sag and short-term interruption of power grid
  • Apparatus and method for low-cost control of voltage sag and short-term interruption of power grid

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Embodiment Construction

[0032] figure 1 Shows a specific structure diagram of a low-cost compensation device for controlling voltage sags and short-term interruptions of the power grid. The device includes the device including two power incoming AC fast switch units and two bypass mechanical maintenance switch units, DC The energy storage unit and the parallel inverter are connected in series between the system power supply and the sensitive load.

[0033] The fast switch units SCR1 and SCR2 are respectively connected to the main power supply and the backup power supply, and are mainly used for the switching of dual power supply; the two bypass mechanical maintenance switch units are connected in parallel with SCR1 and SCR2 respectively, and are mainly used for failure of SCR1 and SCR2 Bypass operation, to prevent the load power supply from being interrupted when the AC fast switch fails; the DC energy storage unit is mainly used to provide the active power provided to the load during the switching proce...

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Abstract

The invention discloses an apparatus and method for the low-cost control of voltage sag and short-term interruption of a power grid. The method employs a double-channel power supply for solving a problem of the quick mutual switching of load power supply reliability and employs the advantages of the conventional DVR, and combines the two sides, so the apparatus can solve a problem of voltage sag and energy quality which commonly exist in the power grid, effectively guarantees the power utilization reliability of a sensitive load, solves problems that the energy storage element in a conventional voltage sag compensation device is expensive and difficult to maintain, can reduce the energy consumption, can save the installation space, can reduce the operation cost of the apparatus, and is very good in economic benefits.

Description

Technical field [0001] The invention relates to the field of power distribution networks, in particular to a low-cost device and method for managing voltage sags and short-term interruptions of power grids. Background technique [0002] Voltage sag is the most common power quality problem in the industrial power field. It is specifically manifested as a short-term interruption of voltage, or a phenomenon in which the effective value of voltage drops suddenly and then quickly recovers. Voltage sags are mostly accidental emergencies, with a high frequency of occurrence, and the cause of the fault is complicated and difficult to troubleshoot. With the increasing degree of industrial automation, a large number of sensitive loads such as precision electronic equipment are used, and equipment shutdown due to power supply voltage disturbances will cause serious economic losses. [0003] For most factories with high power consumption, there are generally two 10kV / 35kV high-voltage incomin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/32
CPCH02J3/0073H02J3/32
Inventor 黄晓辉袁景李志国
Owner NANJING HEXI ELECTRIC CO LTD
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