Medium-voltage dynamic voltage recovery method and system based on zero-sequence voltage optimization compensation
A technology of dynamic voltage recovery and zero-sequence voltage, applied in the direction of AC network voltage adjustment, etc., can solve the problems that are not conducive to the design capacity of DVR, reduce the comprehensive utilization rate of compensation devices, and the devices cannot compensate for voltage, etc.
Active Publication Date: 2016-09-28
WUHAN UNIV
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The compensation range of the DVR device is limited by the maximum phase compensation voltage. As long as the compensation voltage required by one phase exceeds the compensation capacity, the device cannot perform sufficient voltage compensation, which greatly reduces the comprehensive utilization of the compensation device and is not conducive to the maximum use of DVR. design capacity
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
[0039] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0040] The current medium-voltage dynamic voltage restorer system includes a DVR circuit device part and a DSP controller part, such as figure 1As shown, the DVR circuit device includes an energy storage unit, an inverter unit, a filter unit and a bypass system unit, and the DSP controller part includes reference voltage calculation and PWM signal generation links. The present invention proposes that the zero-sequence voltage optimization process is carried out between the reference voltage calculation process and the PWM signal generation process, that is, the DSP controller collects the voltage signals on the load side and the system side, and sequentially passes through reference voltage calculation, zero-sequence voltage optimization, and PWM signal generation In the link, a PWM signal is sent to control the inverter uni...
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 provides a medium-voltage dynamic voltage restoring method and a medium-voltage dynamic voltage restoring system based on zero-sequence voltage optimization compensation. Zero-sequence voltage optimization comprises the steps: calculating to obtain voltage, which needs to be compensated, of each phase of a DVR (Dynamic Voltage Restorer) and corresponding line voltage which needs to be compensated according to full compensation requirements; setting vectors corresponding to three phase voltages of the busbar side of the DVR before dropping respectively to be OA', OB' and OC'; setting the vectors corresponding to the three phase voltages of the busbar side of the DVR after dropping respectively to be OA, OB and OC; vectors respectively corresponding to the voltage, which needs to be compensated, of each phase of the DVR are A'A, B'B and C'C; translating the three reference voltage vectors, namely A'A, B'B and C'C, to a point O; Finding a point O', so that the maximum of the distance between O' and three vertices of a triangle A'B'C' is the minimum, and the vector OO' corresponds to zero-sequence voltage, thereby obtaining optimization results. According to the medium-voltage dynamic voltage restoring method and the medium-voltage dynamic voltage restoring system, the problem that load voltage temporarily rises after compensation with a traditional reference voltage calculation method can be avoided, and additionally, the requirements on the compensation capability of a dynamic voltage restorer can be effectively reduced.
Description
technical field [0001] The invention belongs to the technical field of dynamic voltage restorers, in particular to a medium-voltage dynamic voltage restorer system based on zero-sequence voltage optimization compensation. Background technique [0002] Dynamic Voltage Restorer (Dynamic Voltage Restorer, DVR) is considered to be one of the most effective means to control the problem of voltage drop. Most of the current voltage drop compensation devices are used in low-voltage power distribution systems to compensate sensitive loads on the spot. Due to the limited protection range, and with the increasing number and capacity of sensitive loads, the economic efficiency of this control measure is poor, so the voltage drop compensation device can obtain a larger protection range when installed in a high voltage level system. The 3-60kV medium-voltage distribution network in my country generally adopts the non-effective neutral point grounding method, and the medium-voltage large-...
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): H02J3/12
CPCH02J3/12
Inventor 乐健杨金涛杜旭周武刘开培
Owner WUHAN UNIV