CN-115795730-B - Method and device for calculating design parameters of multi-converter station homotype transformer

CN115795730BCN 115795730 BCN115795730 BCN 115795730BCN-115795730-B

Abstract

The application discloses a method and a device for calculating design parameters of a homotype transformer of a multi-converter station, wherein the method comprises the steps of obtaining transformation basic data of a rectifying side and an inverting side, calculating short circuit impedance of the rectifying side and the inverting side, determining equivalent inductive voltage drop of the rectifying side and equivalent inductive voltage drop of the inverting side according to the short circuit impedance, calculating ideal idle voltage of the homotype transformer, calculating the design parameters of the homotype transformer according to the ideal idle voltage and the transformation basic data through a homotype transformer parameter calculation formula, and setting the homotype transformers of the rectifying side and the inverting side of a direct current transmission system according to the obtained design parameters, so that the spare parts of the converter transformer can be reduced, repeated design of the transformer and repeated test can be avoided, and equipment investment can be reduced.

Inventors

XIN QINGMING
ZHAO XIAOBIN
LI HUAN
GUO LONG
LEI BO
LI LINGFEI

Assignees

南方电网科学研究院有限责任公司
中国南方电网有限责任公司

Dates

Publication Date: 20260505
Application Date: 20221130

Claims (6)

1. The method for calculating the design parameters of the multi-converter station type transformer is characterized by comprising the following steps of: The method comprises the steps of obtaining transformation basic data of a rectifying side and an inverting side, and calculating short circuit impedance of the rectifying side and the inverting side, wherein the transformation basic data specifically comprises transformer capacity, maximum short circuit capacity of an alternating current system, rated direct current and maximum tolerable short circuit current of a converter station; Determining the equivalent inductive voltage drop at the rectifying side and the equivalent inductive voltage drop at the inverting side according to the short circuit impedance; According to the equivalent inductive voltage drop of the rectifying side and the equivalent inductive voltage drop of the inverting side, an ideal no-load voltage of the same-type transformer is calculated by combining a no-load voltage calculation formula; According to the ideal no-load voltage and the transformation basic data, the design parameters of the same type transformer are calculated through a calculation formula of the parameter of the same type transformer, so that transformers on the rectifying side and the inverting side of the converter station are set according to the design parameters of the same type transformer, and the design parameters of the same type transformer specifically comprise valve side current, transformer capacity, a trigger angle of the transformer on the rectifying side and a trigger angle of the transformer on the inverting side.
2. The method for calculating design parameters of a multi-converter station homotype transformer according to claim 1, wherein the no-load voltage calculation formula specifically comprises: Wherein U di0NR is the rated no-load voltage of the rectifying side converter transformer, alpha N is the rated firing angle of the rectifying side transformer, U dR is the rated voltage of the converter station, I dN is the rated current, D x is the rectifying side equivalent inductive voltage drop, R r is the rectifying side equivalent resistive voltage drop, U di0NI is the rated no-load voltage of the inverting side converter transformer, gamma N is the rated firing angle of the inverting side transformer, R is the direct current resistance between the rectifying side and the inverting side, X I is the inverting side equivalent inductive voltage drop, R I is the inverting side equivalent resistive voltage drop, Is an ideal no-load voltage of the same type transformer.
3. The method for calculating design parameters of a multi-converter station homotype transformer according to claim 1, wherein the homotype transformer parameter calculation formula specifically comprises: In the formula, Is the ideal no-load voltage of the same type transformer, I dN is rated current, U dR is rated voltage of a converter station, D x is equivalent inductive voltage drop at the rectifying side, R r is equivalent resistive voltage drop at the rectifying side, For the firing angle of the rectifier side transformer, For the trigger angle of the inverter-side transformer, X I is the inverter-side equivalent inductive voltage drop, R I is the inverter-side equivalent resistive voltage drop, R is the direct current resistance between the rectifying side and the inverter side, I vN is the valve current, and S is the transformer capacity.
4. A multi-converter station homotype transformer design parameter calculation device, comprising: The method comprises the steps of obtaining transformation basic data of a rectifying side and an inverting side, and calculating short circuit impedance of the rectifying side and the inverting side, wherein the transformation basic data specifically comprises transformer capacity, maximum short circuit capacity of an alternating current system, rated direct current and maximum tolerable short circuit current of a converter station; Determining the equivalent inductive voltage drop at the rectifying side and the equivalent inductive voltage drop at the inverting side according to the short circuit impedance; According to the equivalent inductive voltage drop of the rectifying side and the equivalent inductive voltage drop of the inverting side, an ideal no-load voltage of the same-type transformer is calculated by combining a no-load voltage calculation formula; According to the ideal no-load voltage and the transformation basic data, the design parameters of the same type transformer are calculated through a calculation formula of the parameter of the same type transformer, so that transformers on the rectifying side and the inverting side of the converter station are set according to the design parameters of the same type transformer, and the design parameters of the same type transformer specifically comprise valve side current, transformer capacity, a trigger angle of the transformer on the rectifying side and a trigger angle of the transformer on the inverting side.
5. The device for calculating design parameters of a multi-converter station homotype transformer according to claim 4, wherein the no-load voltage calculation formula specifically comprises: Wherein U di0NR is the rated no-load voltage of the rectifying side converter transformer, alpha N is the rated firing angle of the rectifying side transformer, U dR is the rated voltage of the converter station, I dN is the rated current, D x is the rectifying side equivalent inductive voltage drop, R r is the rectifying side equivalent resistive voltage drop, U di0NI is the rated no-load voltage of the inverting side converter transformer, gamma N is the rated firing angle of the inverting side transformer, R is the direct current resistance between the rectifying side and the inverting side, X I is the inverting side equivalent inductive voltage drop, R I is the inverting side equivalent resistive voltage drop, Is an ideal no-load voltage of the same type transformer.
6. The device for calculating parameters of a transformer of the same type as defined in claim 4, wherein the calculation formula of parameters of the same type transformer is specifically as follows: In the formula, Is the ideal no-load voltage of the same type transformer, I dN is rated current, U dR is rated voltage of a converter station, D x is equivalent inductive voltage drop at the rectifying side, R r is equivalent resistive voltage drop at the rectifying side, For the firing angle of the rectifier side transformer, For the trigger angle of the inverter-side transformer, X I is the inverter-side equivalent inductive voltage drop, R I is the inverter-side equivalent resistive voltage drop, R is the direct current resistance between the rectifying side and the inverter side, I vN is the valve current, and S is the transformer capacity.

Description

Method and device for calculating design parameters of multi-converter station homotype transformer Technical Field The application relates to the technical field of transformers, in particular to a method and a device for calculating design parameters of a multi-converter station homotype transformer. Background In the conventional direct current design at present, the converter transformers are designed according to the natural power in a single direction, namely, the loss of the direct current transmission project is considered, the capacity of the transformer at the inversion side is often lower than that of the transformer at the rectification side, in the actual project, in order to ensure that the working conditions at the rectification side and the working conditions at the two ends of the inversion side are similar, the transformers are designed according to the working condition differences of the converter stations at the two sides respectively in a common way, so that the types of the transformers at each converter station are different, the design is required to be carried out respectively, different types of tests are required to be carried out, the design cost and the test cost are relatively high, meanwhile, the operation and maintenance at the later stage are quite unfavorable, and the transformers are required to be provided with different spare parts and are relatively high. Disclosure of Invention The application provides a method and a device for calculating design parameters of transformers of multiple converter stations, which are used for solving the technical problems that in the existing direct current design, the types of transformers of each converter station are different, the design needs to be developed respectively, different types of tests need to be carried out, and the design cost and the test cost are relatively high. In order to solve the technical problem, the method for calculating design parameters of a multi-converter station homotype transformer provided by the first aspect of the application comprises the following steps: Obtaining transformation basic data of a rectifying side and an inverting side, and calculating short circuit impedance of the rectifying side and the inverting side; Determining the equivalent inductive voltage drop at the rectifying side and the equivalent inductive voltage drop at the inverting side according to the short circuit impedance; According to the equivalent inductive voltage drop of the rectifying side and the equivalent inductive voltage drop of the inverting side, an ideal no-load voltage of the same-type transformer is calculated by combining a no-load voltage calculation formula; and calculating design parameters of the same type of transformers according to the ideal no-load voltage and the transformation basic data through a calculation formula of parameters of the same type of transformers so as to set transformers on a rectifying side and an inverting side of the converter station according to the design parameters of the same type of transformers. Preferably, the transformation basic data comprise in particular transformer capacity, maximum short-circuit capacity of the ac system, rated dc current and maximum tolerable short-circuit current of the converter station. Preferably, the design parameters of the homotype transformer comprise valve side current, transformer capacity, rectifier side transformer trigger angle and inverter side transformer trigger angle. Preferably, the no-load voltage calculation formula is specifically: Udi0N＝max(Udi0NR,Udi0NI) Wherein U di0NR is the rated no-load voltage of the rectifying side converter transformer, alpha N is the rated firing angle of the rectifying side transformer, U dR is the rated voltage of the converter station, I dN is the rated current, D x is the rectifying side equivalent inductive voltage drop, R r is the rectifying side equivalent resistive voltage drop, U di0NI is the rated no-load voltage of the inverting side converter transformer, gamma N is the rated firing angle of the inverting side transformer, R is the direct current resistance between the rectifying side and the inverting side, X I is the inverting side equivalent inductive voltage drop, R I is the inverting side equivalent resistive voltage drop, and U di0N is the ideal no-load voltage of the same type of transformer. Preferably, the calculation formula of the parameters of the same type transformer is specifically: Wherein U di0N is the ideal no-load voltage of the same type transformer, I dN is the rated current, U dR is the rated voltage of the converter station, D x is the rectifying side equivalent inductive voltage drop, R r is the rectifying side equivalent resistive voltage drop, alpha 'N is the firing angle of the rectifying side transformer, gamma' N is the firing angle of the inverting side transformer, X I is the inverting side equivalent inductive voltage drop, R I is the inverting side equivale