Voltage stability analyzing method and device based on short circuit capacity

A technology for short-circuit capacity and voltage stability, which is applied in the field of voltage stability analysis methods and devices based on short-circuit capacity, can solve problems such as the incompatibility of load-increasing methods of the whole network, and achieve good popularization and application value and prospects.

Inactive Publication Date: 2012-02-08
WUHAN UNIV
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Problems solved by technology

[0004] The present invention mainly solves the problem of voltage stability existing in the prior art. Most of the research focuses on the voltage stability problem caused by the load side. Technical issues such as incompatibility of the actual power system; provides a method to study the voltage stability problem from the load side and the system...

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  • Voltage stability analyzing method and device based on short circuit capacity
  • Voltage stability analyzing method and device based on short circuit capacity
  • Voltage stability analyzing method and device based on short circuit capacity

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Embodiment

[0035] A voltage stability analysis method and device based on short-circuit capacity, the details are as follows:

[0036] First define the minimum short-circuit capacity for load bus voltage stability, based on the formula:

[0037]

[0038] in: The minimum short-circuit capacity to maintain voltage stability for the load bus, is the apparent power of the load, , , are the load active power and reactive power, respectively, is the load power factor, , is the Thevenin equivalent potential on the system side, and are the equivalent resistance and reactance of the distribution network respectively; the derivation process of the formula is as follows:

[0039] A. According to the Thevenin equivalent circuit of load nodes, the relationship between load bus voltage and short-circuit capacity is deduced by analytical method. Extending the network of voltage stability analysis from the transmission network to the distribution network, the Thevenin equivalent...

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Abstract

The invention relates to a voltage stability analyzing method and device, and in particular relates to a voltage stability analyzing method and device based on short circuit capacity. The main operating method comprises the following steps of: A, deriving the relation between the load busbar voltage and short circuit capacity by an analytic method according to a load node Thevenin's equivalent circuit; B, based on the relation between the load busbar voltage and short circuit capacity, deriving the minimum short circuit capacity keeping the load busbar voltage stable; C, solving the short circuit capacity provided by a system side by a two point method; and D, establishing a busbar voltage stability margin measuring index and a voltage safety criterion. Based on the load busbar short circuit capacity and by analyzing the voltage stability problem on the load side and the system side, the invention provides a new electric system voltage stability analyzing method which overcomes the defects of the continuation power flow full-grid load increasing mode, solves the problem of evaluating the voltage stability on the system side or the load side singly, and has good application value and popularization prospect.

Description

technical field [0001] The invention relates to a voltage stability analysis method and a device thereof, in particular to a voltage stability analysis method based on short-circuit capacity and a device thereof. Background technique [0002] At present, my country's power system has entered the era of large power grids, large units, ultra-high voltage, and long-distance transmission. In recent years, the large power grid voltage collapse accidents in foreign countries have sounded the alarm for the operation of my country's power grid. At the beginning of the "Twelfth Five-Year Plan" period, the AC UHV network frame will take shape. The voltage safety analysis of the power transmission channel of the UHV AC demonstration project is carried out. The voltage of some central points of the regional power grid is low, resulting in a decline in the dynamic stability of the interconnected system, which has an adverse effect on the safe and stable operation of the system. The tra...

Claims

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Application Information

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IPC IPC(8): H02J3/12
Inventor 孙元章徐箭邓桂平黄磊崔挺徐浩
Owner WUHAN UNIV
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