A special converter for station area and its control method
A control method and converter technology, applied in AC network circuits, AC network load balancing, reactive power adjustment/elimination/compensation, etc. Phase unbalance and other problems, to achieve the effect of reducing capacity configuration requirements, saving floor space, and reducing three-phase unbalance
Active Publication Date: 2022-05-13
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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Problems solved by technology
The existing reactive power compensation device has limited treatment capacity; the purpose of controlling three-phase imbalance and providing active power can be achieved by connecting energy storage converters in parallel, but the system occupies a large area and the cost is higher than the supporting range of the station area
Method used
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[0030] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.
[0031] figure 1 It is a structural diagram of the special converter device for the station area of the present invention, including a DC capacitor, a power module, a starting module, a filter module, an isolation transformer, a detection module, a control module, a display and control module, a DC interface, a communication module and auxiliary parts; wherein, The DC interface, DC capacitor, power module, start-up module, filter module, and isolation transformer are connected in sequence, the auxiliary part and the control module are connected to the power module, the detection module is connected to the control module and the low-voltage power distribution cabinet of the load, and the detection module is also connecte...
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The invention provides a special converter for station area and its control method. The dedicated converter for station area includes a power module, a start-up module, an isolation transformer, a detection module, a filter module, a DC capacitor, a control module, a display and control module, a DC Interface, communication module, auxiliary part; based on the structure and function of the converter, the control method is provided: monitor the output three-phase voltage and current of the distribution transformer in real time, and determine whether the converter is in the working state or the standby state through the detection module and the control module , the working state includes only the reactive power compensation provided by the converter in the first stage, or the reactive power and active power compensation provided by the converter and the energy storage battery in the second stage, or only used as a rectifier to charge the energy storage battery. The invention solves the heavy load in the distribution substation area, effectively reduces the three-phase unbalance degree, reduces the capacity configuration requirement of the energy storage battery in the distribution substation area, and saves the occupied area of the converter and the whole system.
Description
technical field [0001] The invention relates to the technical field of distribution station area management, in particular to a dedicated converter for a station area and a control method thereof. Background technique [0002] With the continuous improvement of the level of urban and rural electrification, the economic volume of urban and rural enterprises continues to expand, the distribution network load continues to rise, and the daily load peak-to-valley difference gradually widens. In the low-voltage station area, the distribution transformer is overloaded and the tripping phenomenon caused by the voltage exceeding the limit occurs frequently. Through practice and research, it is found that most of the heavy load or overload phenomenon in the distribution station area is accompanied by three-phase unbalance, and one of the phases is seriously overloaded, which causes the neutral point voltage to shift, and the neutral line flows through a large current. Phase voltage a...
Claims
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IPC IPC(8): H02J3/38H02J3/18H02J3/26H02J3/32H02J13/00
CPCH02J13/0062H02J3/381H02J3/18H02J3/26H02J3/32H02J13/00001Y04S10/12Y04S10/14Y02E40/30Y02E40/50Y02E40/70Y02E60/00
Inventor 张科杰李爱魁刘飞王伟张鑫蔡炜张爱芳
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST