Method for casting and canceling 10kV backup automatic switching adaptive up-grade safe and automatic device under unit connection
A technology of self-injection and self-device, which is applied in the field of electric energy control for rational distribution of power on substation busbars, can solve problems such as influence, failure to consider safety self-installation, unfavorable power supply reliability, etc., and achieve strong engineering applicability, economy and good engineering effect
Active Publication Date: 2012-07-04
广州穗华能源科技有限公司
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Problems solved by technology
[0003] At present, the 10kV standby automatic switching device does not consider the constraints of the safety and self-connection device, and lacks a perfect self-adaptive switch-on and withdrawal strategy. In order to give full play to the role of the safety and self-switching device, the power grid operation department withdraws part of the 10kV backup and automatic switching from operation, which has caused serious damage to the reliability of power supply. negative effect
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[0028] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings and examples, but the implementation and protection of the present invention are not limited thereto.
[0029] figure 1 It is a typical 110kV substation three-bus four-section main wiring diagram. During normal operation, incoming line 1, incoming line 2, and incoming line 3 are powered by different 110kV lines respectively, and the first circuit breakers DL, 2DL, 6DL, and 7DL are on position, the third circuit breaker DL, 8DL is in the open position.
[0030] The present invention needs to collect following power grid operation data (all taking FBZTA as example):
[0031] 1. See Table 1 for the input analog quantity.
[0032] Table 1
[0033] Analog
the symbol
I mother three-phase voltage
u a1 , U b1 , U c1
II mother A three-phase voltage
u a2 , U b2 , U c2
1# main transformer low-vol...
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The invention provides a method for casting and canceling a 10kV backup automatic switching adaptive up-grade safe and automatic device under unit connection. A main line connection way of a 110kV converting station where unit connection is combined, various constraints on 10kV backup automatic switching are comprehensively analyzed, and in-place information and the unbalance degree of the voltage of a 10kV bus serve as criteria to form a 10kV backup automatic switching casting and canceling logic matched with the up-grade safe and automatic device. The backup automatic switching equipment does not adopt single criterion, but combines voltage amplitude criterion with negative sequence voltage criterion to form the relatively perfect action logic, so the 10kV backup automatic switching can be reliably ensured to adapt to the up-grade safe and automatic device to cast and cancel, and the operation rate of the 10kV backup automatic switching equipment can be improved; all the backup automatic switching action information is from the local 110kV converting station, so remote information is not required to be acquired from an up-grade converting station; and the project applicability is high, so the building and maintenance cost of a communication channel is not required to be additionally increased.
Description
technical field [0001] The invention relates to the technical field of electric energy control for rational distribution of power on a substation bus, in particular to a method for switching on and off of a 10kV standby self-switching self-adaptive upper-level security device under unit wiring. Background technique [0002] With the rapid development of the power grid, in order to improve the stability of the power grid, safety automatic devices such as low-frequency and low-voltage load shedding devices and stability control systems are widely installed in 220kV and 500kV substations. After the access of the safety self-connection device, new constraints have been imposed on the switching on and off of the 10kV standby self-injection device. The result of the action of the safety device is to remove part of the load. At this time, the lower-level 10kV standby automatic switching device should be withdrawn to ensure the reliable removal of the load. When the main power supp...
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Inventor 蔡泽祥刘文泽竹之涵苏忠阳
Owner 广州穗华能源科技有限公司