Capacity-constant method of partitioned interconnection devices of urban power grid based on flexible DC technology

A flexible DC, urban power grid technology, applied in flexible AC transmission systems, circuit devices, AC network circuits, etc., can solve problems such as power flow overload

Active Publication Date: 2018-10-02
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, as the load level of the urban power grid increases year by year, the divisional operation of the urban power grid faces the challenges of power balance and power flow overload after N-1 faults [4] , and the problem of voltage stability under transient faults, it is very necessary to provide emergency support for inter-regional power

Method used

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  • Capacity-constant method of partitioned interconnection devices of urban power grid based on flexible DC technology
  • Capacity-constant method of partitioned interconnection devices of urban power grid based on flexible DC technology
  • Capacity-constant method of partitioned interconnection devices of urban power grid based on flexible DC technology

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Embodiment Construction

[0042] In the basic case of known interconnected partitions, the present invention can reasonably determine the capacity of partitioned interconnected devices, and according to needs, based on the derived device capacity and the Q of the maximum reactive power output max -S r The reactive power output capability is improved by adjusting the transformation ratio of the connected transformer and reducing the equivalent reactance between the device and the AC system. The present invention is described below

[0043] First, the steady-state power operating range of the device is analyzed.

[0044] The partition interconnection device uses a half-bridge modular multilevel converter (MMC) to realize flexible interconnection between high-voltage partitions. figure 1 Shown is the equivalent circuit diagram of the MMC access system on the side of the partition interconnection device, is the equivalent voltage of the AC system, L s is the equivalent inductance of the AC system; U ...

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Abstract

The invention discloses a constant volume method of an urban power grid district-dividing interconnection device based on a flexible direct current technology. The method comprises the following steps of 1, solving active power requirements; 2, solving reactive power requirements; 3, performing volume design meeting the power requirements; 4, performing volume processing based on modularized multi-level current converter modularization; 5, performing volume rounding. Under the basic condition of knowing the interconnection district division, the method provided by the invention has the advantage that the volume of the district-dividing interconnection device can be reasonably determined.

Description

technical field [0001] The invention belongs to the planning field of distribution network (flexible distribution network) after flexible DC device transformation. Provided is a method for constant capacity of urban grid partition interconnection devices. Background technique [0002] Urban power grid is an important part of the power system and one of the important infrastructures of urban modernization. With the rapid development of my country's economy, the demand for power supply and reliability requirements of urban power grids are getting higher and higher. At present, most large-scale urban power grids are receiving-end power grids, and the installed capacity of local power sources is far from meeting the load demand, and the proportion of incoming power from outside the region is relatively high [1] . In order to solve the problem of excessive short-circuit current in the power grid and prevent potential accidents in the 500kV / 220kV electromagnetic ring network, la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20Y02E40/10
Inventor 肖峻蒋迅郭伟刚发运
Owner TIANJIN UNIV
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