IEC TS 62578 pdf download – Power electronics systems and equipment – Operation conditions and characteristics of active infeed converter applications

IEC TS 62578 pdf download – Power electronics systems and equipment – Operation conditions and characteristics of active infeed converter applications
1 scope
This technical specification describes the operation conditions and typical characteristics ofActive Infeed Converters (AIC) of all technologies and topologies which can be connectedbetween the electrical power supply system (lines) and a current or voltage stiff d.c.-side andwhich can convert electrical power (active and reactive) in both directions (generative orregenerative).
Applications with AlC are realized together for example with d.c.-sides of adjustable speedPower Drive Systems (PDS), Uninterruptible Power Systems (UPS), active filters,photovoltaicsystems, wind turbine systems, etc., of all voltages and power sizes.
Active Infeed Converters are generally connected between the electrical power supply system(lines) and a current or voltage d.c.-side,with the objective to disburden the system from lowfrequency harmonics (e.g. less than 1 kHz) by a sinusoidal approach of the lines current.Some of them can additionally control the harmonic distortion of an applied voltage or current.
AlC are able to control the power factor of a power supply system section by moving theelectrical power (active and reactive) in both directions (generative or regenerative), whichenables energy saving in the system and stabilization of the power supply voltage.
The following is excluded from the scope:
requirements for the design，development or further functionality of active infeedapplications;
probability of interactions or influences of the AlC with other equipment caused byparasitic elements in an installation as well as their mitigation.
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
IEC 61800-3，Adjustable speed electrical power drive systems – Part 3: EMC productstandard including specific test methods
IEC 61800-5-1，Adjustable speed electrical power drive systems – Part 5-1: Safetyrequirements -electrical,thermal and energy
IEC 62040-1, Uninterruptible power systems (UPS) – Part 1:General and safety requirementsfor UPs
IEC 62040-2，Uninterruptible power systems (UPs) – Part 2: Electromagnetic compatibility(EMC) requirements
IEC 62103，Electronic equipment for use in power installations
3Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
Active Infeed ConverterAIC
self-commutated electronic power converters of all technologies，topologies，voltages andsizes which are connected between the a.c. power supply system (lines) and a stiff d.c.-side(current source or voltage source) and which can convert electric power in both directions(generative or regenerative) and which can control the reactive power or the power factor
Some of them can additionally control the harmonics to reduce the distortion of an appliedvoltage or current.
Basic topologies may be realized as a Voltage Source Converter (VsC) or a Current SourceConverter (csc).
NOTE In the lEV，these terms (vsc and cSC) are defined as voltage stiff a.c.J/d.c,converter [551-12-03] andcurrent stiff a.c.l/d.c.converter [551-12-04].Most of the AlCs are bi-directional converters and have sources on thed.c. side.So， they are known as voltage source converters and current source converters in this technicalspecification.
3.2
active infeed application
application using the advantages of an Active lnfeed Converter
3.3
active filter
AlC operating as a filter to control the specific a.c.-side harmonic and interharmonic voltagesor currents usually without a d.c.-side load
3.4
PwM converter
converter generally using a pulse-width modulation technique in order to control the switchingof its semiconductor valve devices
3.5
switching frequency
mean value of the frequency with which the semiconductor valve devices of a PwM converterare operated
NOTEIn some converters the switching frequency may not be the same for all semiconductor valve devices.3.6
pulse frequency
frequency,resulting from the switching frequency and the converter topology，whichcharacterizes,together with the selected pulse pattern,the lowest frequency of non-controllable harmonics or interharmonics at the ln-plant Point of Coupling (IPC)
NOTE The switching frequency itself may not be present as a harmonic or interharmonic,
3.7
pulse pattern
pattern of the switched voltages or currents，measurable at the terminal of the converter,resulting from pulse frequency and modulation schemes used