Parameter calculation method for change-over switches of multi-terminal direct-current system
A multi-terminal DC and transfer switch technology, applied in power transmission and AC networks, etc., can solve the problems of increased recalculation difficulty, slow calculation speed, poor maintainability, etc., and achieve overall economic benefit improvement, good versatility, and strong achievability. Effect
Active Publication Date: 2020-01-24
GUANGZHOU BUREAU CSG EHV POWER TRANSMISSION
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Problems solved by technology
Using this method in a more complex DC grid system needs to enumerate the wiring modes of each transfer switch in different states and the sequence of opening and closing, which requires a large amount of calculation and slow calculation speed. With the reconstruction and expansion of the DC network, the network After the structure changes, the difficulty of recalculation will increase significantly, and the maintainability will be poor
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[0042] The invention designs a multi-terminal DC system transfer switch parameter calculation method combined with topology analysis. The analysis of multi-terminal DC systems with different wiring methods shows that for different DC systems, the conversion circuit part can be equivalent to the equivalent circuit composed of the ground electrode line network, the DC wiring network, and the ground conversion part of the converter station. by Figure 4 Taking the parallel radial multi-terminal DC system as an example, the circuit diagram of the conversion circuit is shown in Figure 5 shown. Analyzing the topological structure of the ground transfer part of the converter station shows that in the process of metal / earth return transfer, a converter station can be considered as a general topology with three nodes, namely Image 6 Midpoints 1, 2, 3 and branches I and II. The topological structure of the converter station is combined with the grounding electrode line network and ...
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The invention discloses a parameter calculation method for the change-over switches of a multi-terminal direct-current system. With the method adopted, the configuration problem of the direct-currentchange-over switches in the multi-terminal direct-current power transmission system can be solved, and the safe, reliable and economic operation of the system can be ensured. Compared with a traditional direct-current change-over switch parameter calculation problem, the method of the invention can decompose the conversion loop of a complex direct-current power transmission network with differentwiring modes into three parts, namely a converter station grounding loop, a direct-current network and a grounding network; the converter station grounding loop is of a general topological structure;with the topological structure of the converter station grounding loop and the topological structure of the direct-current network combined, the topological structure of the direct-current power transmission system can be conveniently and quickly extracted, and an incidence matrix for expressing the structure can be generated; and therefore, the calculation method has good universality and expansibility. When the calculation method is used for solving the parameters of the direct-current change-over switches, corresponding sequential control logic can be determined clearly, and therefore, thecalculation quantity of the part is simplified; a basis is provided for the selection of other parameters such as the line operation mode and power transmission of the direct-current system; and the improvement of the overall economic benefits of direct-current power transmission system engineering is facilitated.
Description
technical field [0001] The present invention relates to the calculation of transfer switch parameters, in particular to a method for calculating transfer switch parameters of a multi-terminal direct current system Background technique [0002] The DC transfer switch is an important shut-off device in the HVDC transmission system, and its position in the HVDC transmission system is as follows: figure 1 shown. Among them, the metal return transfer switch MRTB (metallic return transfer breaker) is located in the ground electrode lead circuit, and its function is to convert the current of the single pole ground return line into the single pole metal return line. In the conversion process, first close the ERTB (earth return transfer breaker), when the unipolar operating system reaches a steady state again, open the MRTB, that is, the current is changed from the two-way shunt state of the ground electrode lead and the pole line to the unipolar flow that only flows through the pol...
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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 李倩徐攀腾宋述波谷裕朱博杨学广李建勋周登波严海健
Owner GUANGZHOU BUREAU CSG EHV POWER TRANSMISSION