Quick electric power measurement method for DC power-end alternating current system
A technology of AC system and measurement method, applied in the direction of measuring electric power, measuring device, measuring electric variable, etc., can solve the problem of not reflecting the real power of the AC system, and achieve the effect of maintaining stable operation
Inactive Publication Date: 2012-10-10
NORTHEAST ELECTRIC POWER DESIGN INST CO LTD OF CHINA POWER ENG CONSULTING GRP
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Problems solved by technology
At this time, the total electric power measured by the conventional method can no longer reflect the real power after the sudden change of the electric power of the AC system, and a new measurement method is needed to quickly measure the surplus electric power of the AC system after the sudden change
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[0011] Referring to the attached drawings, 1 represents power plant A, power plant B, power plant C, power plant D, 2 is a switch station, and 3 is a converter station. In power plant A, power plant B, power plant C, and power plant D, The 4 power plants are equipped with electrical power measurement equipment to measure the active power of each power supply branch in each power plant, namely, branch A1—An, branch B1—Bn, branch C1—Cn, and branch D1—Dn of the generator branch. Power, and the measurement results of each branch PA1...PAn, PB1...PBn, PC1...PCn, PD1...PDn are transmitted to the control master station, namely the converter station, in a fixed period of 1 second, and the converter station receives the power generation The active power values from plant A, power plant B, power plant C, and power plant D are calculated and ∑P=PA1+……PAn+PB1+ ……PBn+PC1+……PCn+PD1+……PDn is sent to the end during normal operation The surplus electric power of the AC system; when any power...
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A quick electric power measurement method for a DC power-end alternating current system comprises the following steps: measurement points are arranged on all power supply branch circuits of the alternating current system; the electric powers send out by all the power supply branch circuits are continually measured and stored in the normal operation period; the measurement results are transmitted to a control master station arranged in a converter station every one second through a communication channel; the control master station calculates the sum of the electric powers of all the branch circuits, which is the total surplus electric power Sigma P of the alternating current system at the moment; when the output electric powers of some power supply branch circuits suddenly change to zero is measured out, the branch circuits are judged to trip, and the tripping information and the steady state electric power values Pm, Pn and the like of the corresponding branch circuits before tripping are transmitted to the control master station; and after receiving the tripping information and the power value before tripping, which are transmitted from any power supply branch circuit, the control master station takes the total electric power Sigma P of the branch circuits, calculated at the last time, after 150ms, and calculates Sigma-Pm-Pn-... to obtain the total surplus electric power of the alternating current system after sudden change. The quick electric power measurement method can quickly measure the electric power of the alternating current system after sudden change and maintain the steady operation of the power-end alternating current system.
Description
technical field [0001] The invention relates to a method for quickly measuring the electric power of an AC system at a sending end of a direct current transmission system, which provides a basis for the rapid adjustment of the transmission power of the direct current system. technical background [0002] The DC transmission in the power system is to convert the alternating current into DC after rectification at the sending end (power supply end), and transmit it to the receiving end (load end) through the DC transmission line, and then convert the direct current into AC through inverter, and inject it into the receiving end system . When the AC system at the sending end is only connected to the outside world via the DC system, the surplus power of the AC system at the sending end is required to match the transmission power of the DC system to maintain the stable operation of the AC and DC system. In the constant power control mode of the DC system, the electric power delive...
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IPC IPC(8): G01R21/00
Inventor 王建华王颖吴晓蓉
Owner NORTHEAST ELECTRIC POWER DESIGN INST CO LTD OF CHINA POWER ENG CONSULTING GRP