Coordinated control method and system for transient recovery of DC power transmission system
A DC transmission system, coordinated control technology, applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., can solve the problems of DC transmission system stability damage, power transmission interruption, DC voltage drop, etc.
Active Publication Date: 2016-09-28
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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[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
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[0092] The signal detection unit 3 includes a voltage sensor 31, a current sensor 33, and two electrical signal change rate detectors; among them, 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 change rate detector is connected to the commutation bus of the inverter side 2, and the other electrical signal change rate 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 the AC voltage change rate detector 32; the electrical signal change rate detector connected to the DC line of the inverter side 2 is the DC current change rate Detector 34; it should be added 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 the specific cond...
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The invention discloses a coordinated control method and system for transient recovery of a DC power transmission system, and relates to the technical field of DC power transmission. The coordinated control method and system are used for inhibiting an inverter side commutation failure to improve the transient recovery characteristics of the DC power transmission system. The coordinated control method for transient recovery of the DC power transmission system comprises the steps of: detecting electric signal information of an inverter side of the DC power transmission system and judging whether the electric signal information meets a start-up criterion of transient current compensation control or not; if so, determining a DC compensation value deltaId-T according to the detected electric signal information and carrying out transient current compensation control on a rectifier side of the DC power transmission system; and if not, re-detecting the electric signal information of the inverter side of the DC power transmission system. The coordinated control method and system for transient recovery of the DC power transmission system are suitable for transient recovery of the high-voltage DC power transmission system.
Description
Technical field [0001] The present 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 a fault occurs, the components of the DC transmission system can stably transition to a new or return to the original stable state, which is called the transient recovery of the DC transmission system. [0003] Traditional DC transmission systems have always used grid commutation. During its operation, commutation failure is the most frequently encountered fault; 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 a...
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Login to View More IPC IPC(8): H02J1/00H02J3/36
CPCY02E60/60H02J1/00H02J3/36
Inventor 赵利刚赵勇李兴源李妮王超
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD