Transient voltage stability quantitative evaluation method based on equivalent impedance of critical system

A transient voltage stabilization, equivalent impedance technique used in the field of evaluation

Active Publication Date: 2014-12-24
STATE GRID CORP OF CHINA +1
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Problems solved by technology

However, due to the existence of differential equations in the dynamic load model, it is difficult to form more accurate quantitative evaluation indicators based on single or multiple sections

Method used

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  • Transient voltage stability quantitative evaluation method based on equivalent impedance of critical system
  • Transient voltage stability quantitative evaluation method based on equivalent impedance of critical system
  • Transient voltage stability quantitative evaluation method based on equivalent impedance of critical system

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Embodiment

[0094] by figure 1 The power system shown is an example. Among them, bus 1 is the infinite power generator at the sending end, bus 2-bus 3 is a double-circuit 500kV line, bus 4 is the load (load model is 60% motor + 40% constant impedance), bus 5 is the receiving unit, and bus 6 is a converter station on the DC inverter side, and bus 7 is a converter station on the DC rectification side. The receiving end load is 1500MW, the power flow active power of line bus 2-bus 3 is 0, and the DC power is 800MW. At 1s, a three-phase short-circuit fault occurs on the side of bus 3 of double-circuit bus 2-bus 3, and the fault is cleared after 1.1s. The load bus voltage and load current curves are as follows figure 2 , image 3 shown.

[0095] Step 1: After the fault occurs, select the load bus 4 as the monitoring bus, and calculate the equivalent potential and equivalent impedance of the system at each moment through time domain simulation. The results are as follows Figure 4 , Fi...

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Abstract

The invention relates to a transient voltage stability quantitative evaluation method based on equivalent impedance of a critical system. The transient voltage stability quantitative evaluation method based on equivalent impedance of the critical system comprises the following steps of selecting a monitoring bus when a system fails; gaining an equivalent impedance curve and an equivalent potential curve of the system by using the monitoring bus and gaining a state variable and an algebra variable of a direct-current or load dynamic model at the monitoring bus during clearing of fault; establishing an equivalent system model; gaining an equivalent impedance curve of the critical system; and calculating a transient voltage stability quantitative evaluation index of the system. Dynamic response characteristics of a direct-current element, a load and the like are sufficiently considered, and transient voltage stability quantitative evaluation is realized. The transient voltage stability quantitative evaluation method can be used for on-line analysis control and off-line simulation analysis of a power system, and facilitates running of an alternating-current to direct-current system; analyzing workers can determine stability of transient voltage, identify weak nodes and timely take effective measures; and the safe and stable running level of a large power grid is improved.

Description

technical field [0001] The invention relates to an evaluation method, in particular to a transient voltage stability quantitative evaluation method based on the equivalent impedance of a critical system. Background technique [0002] With the development of economy and society, the installed capacity and load level continue to increase, the scale of the power grid continues to expand, and the operating point of the system is getting closer and closer to the stability limit, so there is a risk of voltage collapse in the entire system. The problem of transient voltage stability is relatively complicated, and the stability evaluation method and discriminant index have always been research hotspots. The most commonly used transient voltage stabilization method is the time-domain simulation method. Although this method can accurately account for the dynamic characteristics of components, it can only give a conclusion on whether the system is stable, but cannot give information on...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/06
Inventor 张健刘明松印永华林伟芳王琦刘丽萍邵瑶李柏青
Owner STATE GRID CORP OF CHINA
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