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DELTA-WYE TRANSFORMER Z = 5%
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277/480V 88% Third Harmonic Xd = 14%
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V3 = 5% 3 88% = 26% Third Harmonic
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Figure 920 Generators with significant third-harmonic voltage distortion
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can produce large circulating third-harmonic currents when paralleled with the utility system
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attention has been paid to detecting islands or forcing islands to become unstable so they can be detected The reliability concern is that other customers will be subjected to such poor-quality voltage that damage will be sustained The utility is fearful it will be held liable for the damage There is also the safety concern of a generator accidentally energizing the line resulting in injuries to the public and utility personnel Another concern is the DG itself Since reclosing is common, it is essential that the DG detect the island promptly and disconnect If it is still connected when the utility breaker recloses, damage can occur to prime movers, shafts, and components of machines due to the shock from out-of-phase reclosing This highlights one area of potential conflict with utility practices: Those utilities using instantaneous reclose may have to extend the reclose intervals to ensure that there is sufficient time for DG to detect the island and disconnect Relaying is one way to address the issue The main keys are to detect the deviations in voltage and frequency that are outside the values normally expected while interconnected Another approach to anti-islanding is to make requirements for the operating mode for the DG while interconnected that significantly reduce the chances that the generation will match the load when an inadvertent island forms:
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Inverters operating in parallel are less likely to form an island if they are acting as current sources and have a destabilizing signal that is constantly trying to shift the frequency reference out of band5 Islanding would require another source to provide a voltage for the inverter to follow Of course, this source could be provided by any synchronous machine DG that remains on the island
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Distributed Generation and Power Quality Distributed Generation and Power Quality 405
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Interconnected DG should operate in a mode that does not attempt to regulate voltage This usually means a constant power factor or constant reactive power mode For many inverter-based devices, this will be unity power factor, producing watts only Automatic voltage control should be avoided while DG is interconnected to the distribution system unless the generator is directly connected to a control center to receive dispatching and transfer trip signals
Without the ability to regulate voltage, the match between load and generation would have to be almost perfect to escape detection by the protective relaying While these measures will work in the vast majority of cases, there will be some where islanding detection by local intelligence at the DG site is too uncertain One example would be large generation that is permitted to operate with automatic voltage control In such cases, direct transfer trip is usually required
957 Ferroresonance
This section describes an interesting dilemma that illustrates the conflicting requirements that arise when trying to fit DG into a system that is not designed for it Ferroresonance is a special kind of resonance in which the inductive element is the nonlinear characteristic of an iron-core device8 Most commonly, ferroresonance occurs when the magnetizing reactance of a transformer inadvertently is in series with cable or power factor capacitance One interesting case occurs for DG served by cable-fed transformers It is common practice for the larger DG installations to have their own transformer Also, it is nearly universal to require DG to disconnect at the first sign of trouble on the utility system This combination of requirements can lead to a common ferroresonant condition The circuit is shown in Fig 921 Underground cable runs are normally fused at the point where they are tapped off the overhead feeder line This is variously called the riser pole or dip pole Should something happen that causes one or two fuses to blow, the relaying on the DG will detect an unbalanced condition and trip the generator breaker This leaves the transformer isolated on the cable with one or two open phases and no load Either condition is conducive to ferroresonance because the cable capacitance in an open phase, or phases, now appears in series with the transformer s magnetizing impedance (Fig 922) There are several reasons why the riser-pole fuse may blow or become open Normally, they are designed to blow for faults in the cable, but there are other reasons Squirrels or snakes may climb the
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