discussion paper on parallel operation charge - Infraline

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5.3.6 APPARENT POWER IMPORT AND EXPORT Fig.11 Apparent Power Import and Export From the fig. 11, it is clear that captive power plant can supply the excess power to the utility grid only after meeting the requirement for in-house loads. Above are the results of power quality parameters measured for one typical captive power plant. In the similar way power quality parameters have been measured for 10 nos. of sample captive power plants. From these graphical representations, it is clear that Grid provides support through parallel operation in terms of: Absorbing harmonics Absorbing negative phase sequences current Improvement in power factor Meeting fluctuations in load Providing reactive power support, etc. 5.4 FAULT LEVEL AT POINT OF COMMON COUPLING In addition to the measurements of power quality parameters, the fault level at point of common coupling have been obtained through system study analysis as total fault level and quantum of fault level contributed by CPP. 18
Table-VI Sr. No. Name of CPP Fault level at point of Fault level contributed common coupling (MVA) by CPP (MVA) 1 P 9609.60 2540.20 2 Q 3446.50 1095.20 3 R 507.50 86.80 4 S 1393.50 167.90 5 T 2956.30 71.50 6 U 109.00 20.30 7 V 1155.60 59.70 8 W 1230.10 156.70 9 X 653.30 10 Y 287.60 55.90 From the above data, it is clear that the fault level at the point of common coupling is very high compared to the fault level contributed by the individual captive power plant. 5.5 ADVANTANGE OF PARALLEL OPERATION TO CPP From the above technical studies, we can summarize the advantages of parallel operation to CPPs as below: (1) The fluctuations in the load is absorbed by the utility in parallel operation mode (fig. 7). This will reduce the stresses on the consumer's equipments. The bulk consumer can operate his generating units at constant power mode irrespective of load cycle (fig.8). (2) Fluctuating loads of the industries connected in parallel with the grid inject the harmonics into the grid. The current harmonics absorbed by utility grid is much more than that by CPP generator (fig. 1&2). These harmonics flowing in the system are harmful to the equipments and are also responsible for polluting the power quality of the system (3) Negative phase sequence current is generated by unbalance loads in the system. The magnitude of negative phase sequence current is much higher at the point of common coupling than at generator output terminal (fig. 3&4). This unbalance current normally creates problem of overheating of the generators and other equipments of CPP, if not running in parallel with grid. When they are connected to the grid the negative phase sequence current will flow in to the grid. 19
Page 1 and 2: CHHATTISGARH STATE ELECTRICITY REGU
Page 3 and 4: By the time this judgement was rece
Page 5 and 6: commissioning two new units of 250
Page 7 and 8: Sl.No. Name of Consumers (CPPs) Loc
Page 9 and 10: Thus the provisions of the Electric
Page 11 and 12: (b) The studies mentioned below to
Page 13 and 14: 5.3 HIGHLIGHTS OF MEASURED POWER QU
Page 15 and 16: 5.3.3 POWER FACTOR Fig.5 Power Fact
Page 17: 5.3.5 REACTIVE POWER Fig.9 Reactive
Page 21 and 22: Also due to higher diversity, in ad
Page 23 and 24: For example, Capacity of captive po
Page 25 and 26: (4) As per the tariff order passed
Page 27 and 28: sample CPPs can be considered. Due
Page 29 and 30: and quantity. Power quality paramet

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