Intelligent substation breaker phase selection control method based on digital voltage signal
A phase selection control, digital voltage technology, applied in circuit devices, electrical components, information technology support systems, etc., can solve problems such as inability to effectively control circuit breakers, and achieve the effect of solving electromagnetic interference and reducing length.
Active Publication Date: 2017-02-22
CHANGZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER +2
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Problems solved by technology
[0005] The purpose of the present invention is: in view of the substation phase selection control equipment in the prior art, the circuit breaker can only be controlled by the analog voltage signal collected, but the digital voltage signal collected in the intelligent substation cannot effectively control the circuit breaker To solve the problem, provide a phase selection control method for circuit breakers in intelligent substations based on digital voltage signals that can effectively control circuit breakers when the phase selection control equipment is input with digital voltage signals
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Embodiment 1
[0025] The digital voltage signal-based phase selection control method for smart substation circuit breakers in this embodiment uses figure 2 The smart substation shown is taken as an example for illustration. For a specific smart substation, the rated delay time Td of the bus merging unit in its PT interval is a definite value. Phase selection control equipment generally chooses to perform closing / opening operations at the zero-crossing point or peak voltage of the voltage according to different capacitive loads or inductive loads, so as to achieve the best control effect. Since the opening control process is similar to the closing control process, this embodiment only uses the zero-crossing voltage closing process as an example for illustration.
[0026] see Figure 4 , the upper part of which is the analog control voltage output by the conventional electromagnetic voltage transformer, and the lower part is the digital voltage sent by the bus merging unit received by the ...
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The invention provides an intelligent substation breaker phase selection control method based on a digital voltage signal. The method includes: when phase selection control equipment receives a switch-on / switch-off instruction transmitted by a monitoring background, the phase selection control equipment calculates an initial primary side equipment voltage cross-zero point moment by acquiring the frequency and phase information in the digital voltage signal transmitted by a bus combining unit, the transmission rated delay factors of digital voltage are considered to correct control time to obtain the definite control breaker switch-on / switch-off control moment, namely the primary side equipment voltage cross-zero point moment, a breaker is controlled to act at the moment, and precise control of breaker switch-on / switch-off is achieved. The intelligent substation breaker phase selection control method has the advantages that the difficulty that the breaker switch-on / switch-off control method using the phase selection control equipment in the prior art cannot be effectively applied to an intelligent substation based on the digital voltage signal; the blank of an effective intelligent substation phase selection control equipment breaker switch-on and switch-off controlling method is filled up.
Description
technical field [0001] The invention relates to the technical field of intelligent control of circuit breakers in power systems, in particular to a phase selection control method for circuit breakers in intelligent substations based on digital voltage signals. Background technique [0002] Phase-selection closing technology is a technology that can accurately control the closing of circuit breakers in specific phases. As an effective means to suppress transient overvoltage and inrush current in power system closing, it has more advantages than traditional schemes of increasing closing resistance and setting arresters. Technology and cost advantages have been widely used in substations in recent years, especially in ultra-high voltage, ultra-high voltage and DC converter stations. It can effectively suppress transient overvoltage and inrush current when switching power equipment such as no-load lines, no-load transformers, capacitors, and reactors, reduce the impact on the el...
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IPC IPC(8): H02J13/00
CPCH02J13/00019Y02E60/00Y04S10/16
Inventor 张雄伟曹良徐懿张伟吴斌
Owner CHANGZHOU POWER SUPPLY OF JIANGSU ELECTRIC POWER