Coordinated control method and system for transient recovery of DC transmission system
A DC transmission system, coordinated control technology, applied to DC network circuit devices, electrical components, circuit devices, etc., can solve problems such as interference, DC current increase, power transmission interruption, etc.
Active Publication Date: 2018-06-29
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
View PDF1 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] The traditional DC transmission system has always used grid commutation. During its operation, commutation failure is the most common fault encountered; commutation failure is usually due to the reaction of the DC inverter on the inverter side of the DC transmission system to the AC system. Extremely sensitive, when the voltage or current of the AC system fluctuates abnormally, the DC inverter on the inverter side of the DC transmission system is easily affected by it, resulting in commutation failure and interruption of power transmission. At this time, the DC transmission system Fault interference of commutation failure occurs, resulting in a drop in DC voltage and an increase in DC current
If improper control measures are taken in the transient recovery of the DC transmission system, the single commutation failure time of the DC inverter on the inverter side in the DC transmission system will exceed the fundamental wave period of the AC system at the receiving end or the DC The inverter fails to commutate multiple times in a row, causing the DC transmission system to enter a blocking or bypass state, causing continuous interruption of DC transmission power, thus destroying the stability of the entire DC transmission system and seriously affecting the safe operation of the DC transmission system
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment approach
[0092] The signal detection unit 3 includes a voltage sensor 31, a current sensor 33 and two electric signal change rate detectors; wherein, the voltage sensor 31 is connected to the commutation bus of the inverter side 2, and the current sensor 33 is connected to the DC line of the inverter side 2 , one electrical signal rate of change detector is connected to the commutation bus of the inverter side 2, and the other electrical signal rate of change detector is connected to the DC line of the inverter side 2. Specifically, the electrical signal change rate detector connected to the commutation bus of the inverter side 2 is an AC voltage change rate detector 32; the electrical signal change rate detector connected to the DC line of the inverter side 2 is a DC current change rate detector detector 34; what needs to be added is that the AC voltage change rate detector 32 and the DC current change rate detector 34 can be selected and set by those skilled in the art according to th...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a coordinated control method and system for transient recovery of a direct current transmission system, relates to the technical field of direct current transmission, and is used for suppressing the occurrence of commutation failure faults on the inverter side to improve the transient recovery characteristics of the direct current transmission system. The coordinated control method for transient recovery of the DC power transmission system includes: detecting the electrical signal information of the inverter side of the DC power transmission system, and judging whether the electrical signal information satisfies the startup criterion of the transient current compensation control; Signal information, determine the DC current compensation value ΔId‑T, and perform transient current compensation control on the rectification side of the DC power transmission system; if not, re-detect the electrical signal information on the inverter side of the DC power transmission system. The coordinated control method and system for the transient recovery of the direct current transmission system provided by the invention are used for the transient recovery of the high voltage direct current transmission system.
Description
technical field [0001] The invention relates to the technical field of direct current transmission, in particular to a coordinated control method and system for transient recovery of a direct current transmission system. Background technique [0002] During the operation of the DC transmission system, when there is a fault disturbance, the various components in the DC transmission system can stably transition to a new state or return to the original stable state, which is called transient recovery of the DC transmission system. [0003] The traditional DC transmission system has always used grid commutation. During its operation, commutation failure is the most common fault encountered; commutation failure is usually due to the reaction of the DC inverter on the inverter side of the DC transmission system to the AC system. Extremely sensitive, when the voltage or current of the AC system fluctuates abnormally, the DC inverter on the inverter side of the DC transmission syste...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/00H02J3/36
CPCY02E60/60
Inventor 赵利刚赵勇李兴源李妮王超
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD