Zone: Converter zone number.
No. of bridges: Number of series bridges.
Xc: Commutating reactance in ohms per bridge when transformer MVA on the
BZ card is zero, otherwise, in pu based on transformer MVA.
Voltage ratio: Nominal ratio of the secondary voltage (DC side) of converter transformer to the primary voltage (AC side).
Tap step: Tap step in percent.
Tap min: Minimum tap setting in pu.
Alpha max: Maximum alpha in degrees.
Gamma min: Minimum gamma in degrees.
Imax: Maximum DC current in amps.
Second Converter Record
On this record, it is necessary to specify two setpoints for the converter. These setpoints must be consistent with the desired solution and should not over specify the problem. The two letter set point descriptions (two of them must be entered as CTRL MODE) are:
VD - DC voltage in kV (+ve at rectifier and inverter) ID - DC current in amps (+ve at rectifier and -ve at inverter) PA - Real power in MW (-ve at rectifier and +ve at inverter) QA - Reactive power in MVAR (-ve at rectifier and inverter) AL - Firing angle in degrees (+ve at rectifier and inverter) GA - Extinction angle in degrees (+ve at rectifier and inverter) AT - Transformer tap in pu (+ve at rectifier and inverter)
Not all combinations of the above variables are appropriate or desirable. The combinations of VD and ID, VD and PA, and ID and PA result in invalid converter specification and a solution is not attempted. The combination of AL and GA is not recommended but is acceptable.
Numerical values for the set points must be entered as SP1 and SP2 in the same order as the CTRL MODE description. For example, if the DC voltage and the converter alpha are to be specified, then the CTRL MODE will be VDAL and set point 1 will be the desired voltage and set point 2 will be the desired alpha. Sign conventions as described above must be followed when specifying the converter set points.
All items in the second converter record are mandatory.
Code: 'BZ'
Change: ' ' (Blank) -base case, no changes
'D' - delete data associated with converter 'M' - change the data provided for the converter
DCBUS1: Name of the first DC terminal (8 characters long).
DCBUS2: Name of second DC terminal (8 characters long).
ACBUS number or name:
AC bus number (for bus identification code equal to 1 or 3) or AC bus name (for bus identification code equal to 2). 8 characters long.
CKT: Circuit number (one digit).
CTRL MODE: 4 character set point description.
SP1: Converter set point 1.
Type: 1 character that identifies the converter as a rectifier or an inverter ('R': Rectifier; 'I': Inverter).
Trans. MVA: Transformer MVA rating.
Pmin: Minimum real power in MW.
Pmax: Maximum real power in MW.
Qmin: Minimum reactive power in MVAR.
Qmax: Maximum reactive power in MVAR.
BiasR: Voltage compounding resistance in Ohms.
Base kV: Base voltage of transformer primary side in kV (if zero it is set to the base kV of AC bus).
Note that some of the data provided by the converter records such as tap step, minimum and maximum tap, maximum current, minimum and maximum real and reactive powers and bias ohms are only used by central schedulers.
15.18.2
DC Lines
A DC line is specified in one record. Each line has two DC buses and a circuit number to describe its connection with the rest of the network. The line, for power flow purposes, if fully defined once the value is given for its resistance, which must be nonzero. Inductance and capacitance data are used in the stability program. Note that the two capacitance values do not have to be equal and either can be zero. The primary use of this unequal capacitance model will be in situations where the DC filter capacitance or the electrode line surge capacitance is significant. All items in the line record are mandatory.
Code: 'LD'
Change: ' ' (Blank) -base case, no changes
'D' - delete data associated with converter 'M' - change the data provided for the converter
DCBUS1: Name of the first DC terminal (8 characters long).
DCBUS2: Name of second DC terminal (8 characters long).
CKT: Circuit number (one digit).
Group: 3 character group identifier which is used for solution reporting purposes.
Zone: Zone number (one or two digits).
Ldc: Line inductance in mH.
Cdca: Capacitance at DCBUS1 in microF.
Cdcb: Capacitance at DCBUS2 in microF.
Imax: Maximum current in amps.
Mend: 1 character metered end identifier ('F' - DCBUS1; 'T' - DCBUS2).
15.18.3
DC Breakers
A DC breaker is specified by one record. Each breaker has two DC buses and a circuit number to describe its connection with the rest of the network. All items in the breaker record are mandatory.
Code: 'LB'
Change: ' ' (Blank) -base case, no changes
'D' - delete data associated with converter 'M' - change the data provided for the converter
DCBUS1: Name of the first DC terminal (8 characters long).
DCBUS2: Name of second DC terminal (8 characters long).
CKT: Circuit number (one digit).
Group: 3 character group identifier which is used for solution reporting purposes.
Zone: Zone number (one or two digits).
Owner: 3 character ownership ID.
Status: 'CLOSED' or 'OPEN'
15.18.4
DC Buses
Code: 'DA'
Change: Not used (one character)
DCBUS: Name of the bus
Area: Area number of the bus (up to 4 digits).
Zone: Zone number of the bus (up to 4 digits).
15.18.5
Miscellaneous Data
All other DC data corresponding to control of the DC solution and the central schedulers is provided in a format identical to the one used in EPRI RP 1964-4.
15.18.6
Voltage-Sourced Converter
The VSC data is represented by FD and FZ records, similar to the BD and BZ records of line commutation converters. Optionally, there can be an additional FV record for the series VSC of UPFC model as described below:
"FD" record:
Code: 'FD'
Change: ' ' (Blank) - no change
'D' - delete data associated with converter 'M' - change the data provided for the converter
DC bus 1 Name DC node positive connection (8 characters long)
DC bus 2 Name DC node negative connection (8 characters long)
AC bus 1 Number or Name
First AC bus number (for bus identification code equal to 1 or 3) or AC bus name (for bus identification code equal to 2). 8 characters long.
Circuit Number Circuit number (one digit)