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Fig.1.Classification of power system _ stability[9]. In this paper the focus is on transient stability.

Figure 1 Classification of power system _ stability[9]. In this paper the focus is on transient stability.

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Fig.2. 3 Machine 9 bus Power System[11] The WSCC 9 bus system[11],Fig.2 is used as our test system. For this case we chose the following loading. Load bus 5 was supposedly having a load demand of 125 + j520 MVA, bus6 a load demand of 90 + j 30 MVA and load bus 8 having demand of 100 + j35 MVA. The generator and line data are given in Appendix A.
Fig.2. 3 Machine 9 bus Power System[11] The WSCC 9 bus system[11],Fig.2 is used as our test system. For this case we chose the following loading. Load bus 5 was supposedly having a load demand of 125 + j520 MVA, bus6 a load demand of 90 + j 30 MVA and load bus 8 having demand of 100 + j35 MVA. The generator and line data are given in Appendix A.
The total generation of the system is 313.623MW and the total load demand is 312.602MW.After 0.2 sec the power system lost the generator 3(G3) due to various reasons unavoidable ,.now the power system generation after the loss of G3 is 228.623.Then the relative load excess factor L of the system becomes 0.367 and the average rate of frequency change R becomes -1.608Hz/sec. At this rate in Conventional load shedding, let the breakers are supposed to operate after the frequency reaches 48.5Hz then the system frequency reaches that critical 48.5Hz after 0.932 sec only. If we include the tripping delay of 125ms then the frequency will decline further by 0.201Hz and reaches 48.229Hz. So load shedding will occur at a delay of 0.857sec( G3 lost at 0.2sec) after the loss of G3.By means 80MW load has to be shedded to bring back the system to stability, as followed by eq(1). Fig.3. Absolute Power Angles of Generators after 830 MW load shed @0.857 sec.
The total generation of the system is 313.623MW and the total load demand is 312.602MW.After 0.2 sec the power system lost the generator 3(G3) due to various reasons unavoidable ,.now the power system generation after the loss of G3 is 228.623.Then the relative load excess factor L of the system becomes 0.367 and the average rate of frequency change R becomes -1.608Hz/sec. At this rate in Conventional load shedding, let the breakers are supposed to operate after the frequency reaches 48.5Hz then the system frequency reaches that critical 48.5Hz after 0.932 sec only. If we include the tripping delay of 125ms then the frequency will decline further by 0.201Hz and reaches 48.229Hz. So load shedding will occur at a delay of 0.857sec( G3 lost at 0.2sec) after the loss of G3.By means 80MW load has to be shedded to bring back the system to stability, as followed by eq(1). Fig.3. Absolute Power Angles of Generators after 830 MW load shed @0.857 sec.
Fig.5 Generators Electrical Power
Fig.5 Generators Electrical Power
Fig.5&Fig.6 shows the Generators electrical power and generator bus frequencies (alias buses 1,2&3) for adaptive load shedding method. Fig.4. Absolute Power Angles of Generators after 830 MW load shed @0.325 sec.
Fig.5&Fig.6 shows the Generators electrical power and generator bus frequencies (alias buses 1,2&3) for adaptive load shedding method. Fig.4. Absolute Power Angles of Generators after 830 MW load shed @0.325 sec.
B. CASE B:
B. CASE B:
Generators Electrical Power Fig.9&Fig.10 shows the Generators electrical power and generator bus frequencies (alias buses 1,2&3) for adaptive load shedding method.
Generators Electrical Power Fig.9&Fig.10 shows the Generators electrical power and generator bus frequencies (alias buses 1,2&3) for adaptive load shedding method.
Fig.7. Absolute Power Angles of Generators after 180MW load shed @0.44 sec Fig.8. Absolute Power Angles of Generators after 180 MW load shed @0.325 sec
Fig.7. Absolute Power Angles of Generators after 180MW load shed @0.44 sec Fig.8. Absolute Power Angles of Generators after 180 MW load shed @0.325 sec
CONCLUSION:
CONCLUSION:
In this paper the stability of the IEEE 9-bus system has been studied. Two contingencies has been simulated on the test system. Rate of change of is used as the operating principle. The subsequent changes of loss of generation in test system, its transient stability problems and _ its controlling methodologies through fast fault clearing and adaptive load shedding methods are discussed. By the implementation of the adaptive load shedding methods we can decrease the amount to be shed than the amount shedded in conventional load shedding methods.
In this paper the stability of the IEEE 9-bus system has been studied. Two contingencies has been simulated on the test system. Rate of change of is used as the operating principle. The subsequent changes of loss of generation in test system, its transient stability problems and _ its controlling methodologies through fast fault clearing and adaptive load shedding methods are discussed. By the implementation of the adaptive load shedding methods we can decrease the amount to be shed than the amount shedded in conventional load shedding methods.
Appendix A: —_9 Bus System Datz Line Parameters:
Appendix A: —_9 Bus System Datz Line Parameters:
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