IEC TS 61800-8 pdf download – Adjustable speed electrical power drive systems – Part 8: Specification of voltage on the power interface
1 Scope
This part of lEC 61800 gives the guidelines for the determination of voltage on the powerinterface of power drive systems (PDS’s).
NOTEThe power interface，as defined in the IEC 61800 series，is the electrical connection used for thetransmission of the electrical power between the converter and the motor(s) of the PDS.
The guidelines are established for the determination of the phase to phase voltages and thephase to ground voltages at the converter and at the motor terminals.
These guidelines are limited in the first issue of this document to the following topologies withthree phase output
.indirect converter of the voltage source type，with single phase diode rectifier as line side
converter;
indirect converter of the voltage source type，with three phase diode rectifier as line sideconverter;
indirect converter of the voltage source type, with three phase active line side converter.All specified inverters in this issue are of the pulse width modulation type，where theindividual output voltage pulses are varied according to the actual demand of voltage versustime integral.
Other topologies are excluded of the scope of this International Specification.
Safety aspects are excluded from this Specification and are stated in lEC 61800-5 series.EMC aspects are excluded from this Specification and are stated in IEC 61800-3.
2 Normative 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 61000-2-4，Electromagnetic compatibility (EMC) – Part 2-4:Environment – Compatibilitylevels in industrial plants for low-frequency conducted disturbances
3Overview and terms and definitions
3.1overview of the system
A power drive system (PDS) consists of a motor and a complete drive module (CDM). lt doesnot include the equipment driven by the motor. The CDM consists of a basic drive module(BDM) and its possible extensions such as the feeding section or some auxiliaries (e.g.ventilation). The BDM contains converter，control and self-protection functions. Figure 1shows the boundary between the PDS and the rest of the installation and/or manufacturingprocess. lf the PDS has its own dedicated transformer, this transformer is included as a partof the CDM.
For this document the following agreement for all symbols is set, that:
– the index “head” means the peak value and
– the index “star” means bipolar value.
For a given drive topology, the voltage waveform patterns between the later defined sections are in principal constant as shape (including peak values), while their amplitudes depend on the suited operating voltages, assumed as reference values in each section. Depending on the considered section interface and on the nature of the examined voltages (differential or common mode quantities), the reference voltages between sections are average DC or RMS fundamental AC quantities. The actual voltage values shown between sections in the differential mode model and in the common mode model are evaluated as peak values: they are obtained starting from the corresponding reference values, multiplied by suited factors including the effect of the overvoltage phenomena.
3.2 Terms and definitions
For the purposes of this part of the document, the following terms and definitions apply.
3.2.1
power interface
connections needed for the distribution of electrical power within the PDS
[IEC 61 800-3:2004, 3.3.1 1 ]
3.2.2
two-port network
two-port network (or four-terminal network, or quadripole) is an electrical circuit or device with two pairs of terminals
3.2.3
converter reference point
NP
NP is the reference point of the converter (V D+ + V D- ) / 2. The converter reference point can be dedicated for the different topologies. The voltage from NP to ground is generally a
common mode voltage
3.2.4
DC link
power DC circuit linking the input converter and the output converter of an indirect converter,consisting of capacitors and/or reactors to reduce DC voltage and/or DC current ripple
3.2.5
DC link voltages
V d, V d+, V d-
DC link voltage of the converter section. V d+ means the positive potential; V d- means the negative potential
3.2.6
f 0
filter resonance frequency
3.2.7
f 1
fundamental frequency of the inverter output voltage
3.2.8
f P
pulse frequency of the phase
3.2.9
f S
fundamental frequency of the supply voltage system
3.2.1 0
f sw
switching frequency of each semiconductor active device
3.2.1 1
ideal ground
ideal ground is the earth reference point of the installation
IEC TS 61800-8 pdf download – Adjustable speed electrical power drive systems – Part 8: Specification of voltage on the power interface
