A control method of inverter side based on UHVDC transmission project
A UHV DC and control method technology, which is applied in the direction of power transmission AC network, AC network voltage adjustment, reactive power compensation, etc., can solve the problems of system unit reserve capacity reduction, reactive power drop, system loss of stability, etc., to achieve The effect of reducing the probability of commutation failure, suppressing the fluctuation range, and improving stability
A UHV DC and control method technology, which is applied in the direction of power transmission AC network, AC network voltage adjustment, reactive power compensation, etc., can solve the problems of system unit reserve capacity reduction, reactive power drop, system loss of stability, etc., to achieve The effect of reducing the probability of commutation failure, suppressing the fluctuation range, and improving stability
CN109347133BActive Publication Date: 2020-09-08CENT CHINA BRANCH OF STATE GRID CORP OF CHINA +2
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[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0036] figure 1It is a schematic diagram of ±800kV UHV two-terminal DC transmission system, which includes the first AC system, the receiving-end AC system and the DC system; the DC system includes rectifiers and inverters; among them, the first AC system is the sending-end AC system, It is a strong system with a short-circuit ratio of 5.0; the alternating current passes through the converter transformer T 1 , T 2 , the AC power of the AC system at the sending end is further converted into AC power with a lower voltage level to act on the 12-pulse converter, which is rectified into ±800kV UHV DC ...
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The invention discloses an inverter-side control method and system based on an extra high voltage direct-current transmission project. The method comprises the steps of additionally adding an extinction angle modulation module at the inverter-side control system of a direct-current transmission system, increasing a reactive compensation capacity of an inverter station and setting an extinction angle given value when the direct-current transmission system is in a steady state; respectively obtaining second alternating current bus voltage values V0 and Vac at an inverter side when the system isin the steady state and goes wrong; judging whether the extinction angle given value is changed or not, and starting the extinction angle modulation module when a deviation between V0 and Vac is not in the range of + / -5%; and stopping modulation until the second bus voltage level restores to the given range, and restoring the original extinction angle set value. According to the method, the probability of commutation failures of a direct current can be reduced by additionally adding the extinction angle modulation module, the fluctuation range of the alternating current bus voltage is inhibited, the recovery speed of a direct current power is accelerated and the stability of the alternating current power grid voltage is improved.
Description
technical field [0001] The invention belongs to the technical field of electrical engineering, and more specifically relates to an inverter-side control method based on a UHV direct current transmission project. Background technique [0002] UHV DC transmission is suitable for long-distance and large-capacity power transmission, and can realize the optimal allocation of resources, which plays an important role in my country's energy strategy. With the rapid development of UHV DC transmission technology, the dominant form of my country's transmission network has undergone profound changes, from the initial pure AC system to the ultra-high voltage small-capacity DC and AC hybrid, and further developed to UHV large-capacity AC-DC Mixed layout. However, since the UHV DC project usually transmits a large power, the DC transmission power and the reactive power absorbed by the converter will change greatly when disturbed. After the weaker AC system is impacted, it is easy to cause ...
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Patent Timeline
08 Sep 2020
Publication
CN109347133B
- IPC
- H02J3/36; H02J3/12; H02J3/16
- CPC
- H02J3/12; H02J3/16; H02J3/36; Y02E40/30; Y02E60/60
- Inventors
- 张宛楠; 孙海顺