Parallel recovery starting method, system and electric isolation type direct-current transformer
A DC transformer and electrical isolation technology, applied in the direction of converting DC power input to DC power output, electrical components, and adjusting electrical variables, can solve problems such as low work efficiency, shorten recovery time, reduce power shortage time, and shorten The effect of restart time
Pending Publication Date: 2018-05-29
CHINA ELECTRIC POWER RES INST +3
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Problems solved by technology
After the fault is cleared, the outage equipment needs to be put into operation quickly, and the work efficiency is low
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[0031] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0032] Such as figure 1 As shown, the present invention is described for a new type of electrical isolation DC transformer.
[0033] The commonly used control methods for each port of the electrical isolation DC transformer mainly include constant DC voltage control, constant AC voltage control and constant power control. different applications. In addition, the transformer has a positive and negative topology, which can operate independently.
[0034] Such as figure 2 The typical network topology of the DC power grid is shown. During normal operation, the converter T1 (the positive and negative poles are T11 and T12 respectively) is in the constant DC voltage control mode, and the port P1 of the electrically isolated DC transformer (the positive and negative poles are P11 and T12 respectively) P12) is in the constant AC voltage...
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The present invention provides a parallel recovery starting method, a parallel recovery starting system and an electric isolation type direct-current transformer. The electric isolation type direct-current transformer includes a first port P1 and a second port P2; each of the first port P1 and the second port P2 includes a positive pole and a negative pole; one end of the positive pole P11 of thefirst port P1 is connected with one end of the positive pole T11 of a converter T1; the other end of the positive pole P11 of the first port P1 and the other end of the positive pole T11 of the converter T1 are grounded; one end of the negative pole P12 of the first port P1 is connected with one end of the negative pole T12 of the converter T1; the other end of the negative pole T12 of the first port P1 is connected with the other end of the negative pole T12 of the converter T1; two ends of the positive pole and two ends of the negative pole of the second port P2 are connected with an equivalent wind farm; and two ends of the positive pole and two ends of the negative pole of the converter T1 are connected with an alternating-current power grid. The bipolar topologic voltage source converter of the electric isolation type direct-current transformer of the present invention can not only realize the grade conversion of direct-current voltage, but also can realize the bidirectional transmission of active power.
Description
technical field [0001] The invention relates to the technical field of high-voltage direct current transmission, in particular to a parallel recovery start method, system and electrical isolation type direct current transformer. Background technique [0002] With the development of society and the increasingly complex grid structure, DC transmission technology has gradually demonstrated its irreplaceable advantages and has very broad application prospects. The selection of the DC voltage level is very important in the operation of the DC power grid. Generally, in order to reduce the construction area of the project, reduce the initial investment of the project and the difficulty of the design of the project, the DC power grid will introduce a multi-voltage level network topology to improve the operating economy of the system. Enhance the diversity and flexibility of the system. [0003] In order to introduce multiple voltage levels into DC transmission technology, an elec...
Claims
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Login to View More IPC IPC(8): H02J3/36H02M1/36H02M3/335
CPCH02J3/36H02M1/36H02M3/33584Y02E60/60
Inventor 姚良忠王志冰李琰迟永宁王伟胜石立宝刘超魏春霞杨波曹远志庄俊陶以彬赵越
Owner CHINA ELECTRIC POWER RES INST