阅读说明：本技术 一种多回直流同时换相失败的判断方法及系统 (The judgment method and system of a kind of multiple-circuit line commutation failure simultaneously ) 是由 邵瑶 汤涌 周勤勇 何剑 于 2018-05-16 设计创作，主要内容包括：本发明提供了一种多回直流同时换相失败的判断方法及系统,包括：计算至少两个落点于同一交流系统的直流系统逆变侧换流母线之间的互阻抗,及直流系统逆变侧换流母线的自阻抗；根据所述落点于同一交流系统的直流输电系统逆变侧换流母线之间的互阻抗,及直流系统逆变侧换流母线的自阻抗计算多馈入交互作用因子；根据所述多馈入交互作用因子和预先设置的通用临界多馈入交互作用因子判断多回直流系统是否会同时换相失败。本发明提供的技术方案,根据给出的通用临界多馈入交互作用因子,即可判断是否会发生多回直流同时换相失败,大大简化了计算分析过程,缩短了耗时,使用更加方便。(The present invention provides the judgment methods and system of a kind of multiple-circuit line while commutation failure, comprising: calculates the self-impedance of mutual impedance and direct current system inverter side change of current bus of at least two drop points between the direct current system inverter side change of current bus of same AC system；More feed-in interaction factors are calculated according to the self-impedance of mutual impedance and direct current system inverter side change of current bus of the drop point between the DC transmission system inverter side change of current bus of same AC system；According to more feed-in interaction factors and pre-set general critical more feed-in interaction factors judge multiple-circuit line system whether can simultaneously commutation failure.Technical solution provided by the invention can determine whether that multiple-circuit line commutation failure simultaneously can occur, enormously simplify process of calculation analysis, shorten time-consuming according to the general critical more feed-in interaction factors provided, more convenient to use.)

1. the judgment method of a kind of multiple-circuit line while commutation failure characterized by comprising

Calculate mutual impedance and direct current of at least two drop points between the direct current system inverter side change of current bus of same AC system The self-impedance of system inverter side change of current bus；

According to mutual impedance and direct current system of the drop point between the direct current system inverter side change of current bus of same AC system The self-impedance of inverter side change of current bus calculates more feed-in interaction factors；

Judged more times according to more feed-in interaction factors and pre-set general critical more feed-in interaction factors Direct current system whether can simultaneously commutation failure.

2. the judgment method of multiple-circuit line as described in claim 1 while commutation failure, which is characterized in that more feed-ins are handed over The interaction factor is calculated as follows:

Wherein: MIIF_jiMore feed-in interaction factors between direct current system i Inverter Station and direct current system j Inverter Station；Z_eqjiIt is The mutual impedance of direct current system j inverter side change of current bus and direct current system i inverter side change of current bus；Z_eqiiIt is direct current system i inversion The self-impedance of side change of current bus；J >=1, i >=1.

3. the judgment method of multiple-circuit line as described in claim 1 while commutation failure, which is characterized in that described general critical The setting of more feed-in interaction factors is determined by following formula:

In formula: CMIIF_jiCritical more feed-in interaction factors between direct current system i Inverter Station and direct current system j Inverter Station, U_LiLine voltage, U are run for the inverter side change of current bus of direct current system i_LiNFor the inverter side change of current bus line voltage of direct current system i Rated value, U_LjLine voltage, U are run for the inverter side change of current bus of direct current system j_LjNIt is female for the inverter side change of current of direct current system j The rated value of line line voltage, X_Kj% is the percentage of direct current system j converter power transformer short-circuit reactance；I_djFor the steady of direct current system j State running current, I_djNFor the current rating of direct current system j, α_jIt is the operation delayed trigger angle of direct current system j Inverter Station.

4. the judgment method of multiple-circuit line as claimed in claim 3 while commutation failure, which is characterized in that described general critical The setting of more feed-in interaction factors further include:

Set X_K% value is 15%, U_Li≈U_LiN, U_Lj≈U_LjN, I_dj≈I_djN, α_j142 °~143 ° of ≈；

By X_K%, U_Lj0、U_LjN、U_Lm0、U_LmN、I_dj、I_djNAnd α_jSubstitute into the calculation formula of critical more feed-in interaction factors In, general critical more feed-in interaction factors as follows are calculated:

In formula: GCMIIF_jiGeneral critical more feed-in reciprocations between direct current system i Inverter Station and direct current system j Inverter Station The factor.

5. the judgment method of multiple-circuit line as described in claim 1 while commutation failure, which is characterized in that described according to Whether more feed-in interaction factors and pre-set general critical more feed-in interaction factors judge multiple-circuit line system Meeting while commutation failure, comprising:

Judge more feed-in interaction factors whether be less than pre-set general critical more feed-in reciprocations because Son determines that three-phase metallic short circuit failure occurs for a direct current system inverter side change of current bus, will lead to connection if being not less than Commutation failure simultaneously occurs in the multiple-circuit line of same receiving end AC system；If being less than, a direct current system inverter side is determined Three-phase metallicity failure occurs for change of current bus, only results in the direct current system itself to break down and commutation failure, Bu Huiyin occurs Act the multiple-circuit line while commutation failure for being connected to same receiving end AC system.

6. the judgement system of a kind of multiple-circuit line while commutation failure characterized by comprising

First computing module, for calculate at least two drop points in same AC system direct current system inverter side change of current bus it Between mutual impedance and direct current system inverter side change of current bus self-impedance；

Second computing module, for according to the drop point between the direct current system inverter side change of current bus of same AC system The self-impedance of mutual impedance and direct current system inverter side change of current bus calculates more feed-in interaction factors；

Judgment module, for according to more feed-in interaction factors and pre-set general critical more feed-in reciprocations The factor judge multiple-circuit line system whether can simultaneously commutation failure.

7. the judgement system of multiple-circuit line as claimed in claim 6 while commutation failure, which is characterized in that described second calculates Module is for being calculated as follows more feed-in interaction factors:

Wherein: MIIF_jiMore feed-in interaction factors between direct current system i Inverter Station and direct current system j Inverter Station；Z_eqjiIt is The mutual impedance of direct current system j inverter side change of current bus and direct current system i inverter side change of current bus in node equivalent impedance matrix； Z_eqiiIt is the self-impedance of direct current system i inverter side change of current bus in node equivalent impedance matrix；J >=1, i >=1.

8. the judgement system of multiple-circuit line as claimed in claim 6 while commutation failure, which is characterized in that the judgment module Including submodule is arranged, for general critical more feed-in interaction factors to be arranged according to the following formula:

In formula: CMIIF_jiCritical more feed-in interaction factors between direct current system i Inverter Station and direct current system j Inverter Station, U_LiLine voltage, U are run for the inverter side change of current bus of direct current system i_LiNFor the inverter side change of current bus line voltage of direct current system i Rated value, U_LjLine voltage, U are run for the inverter side change of current bus of direct current system j_LjNIt is female for the inverter side change of current of direct current system j The rated value of line line voltage, X_Kj% is the percentage of direct current system j converter power transformer short-circuit reactance；I_djFor the steady of direct current system j State running current, I_djNFor the current rating of direct current system j, α_jIt is the operation delayed trigger angle of direct current system j Inverter Station.

9. the judgement system of multiple-circuit line as claimed in claim 8 while commutation failure, which is characterized in that the setting submodule Block is also used to: setting X_K% value is 15%, U_Li≈U_LiN, U_Lj≈U_LjN, I_dj≈I_djN, α_j142 °~143 ° of ≈；

By X_K%, U_Lj0、U_LjN、U_Lm0、U_LmN、I_dj、I_djNAnd α_jSubstitute into the calculation formula of critical more feed-in interaction factors In, general critical more feed-in interaction factors as follows are calculated:

In formula: GCMIIF_jiGeneral critical more feed-in reciprocations between direct current system i Inverter Station and direct current system j Inverter Station The factor.

10. the judgement system of multiple-circuit line as claimed in claim 6 while commutation failure, which is characterized in that the judgement mould Block is for judging whether more feed-in interaction factors are less than pre-set general critical more feed-in reciprocations The factor determines that three-phase metallic short circuit failure, the company of will lead to occur for a direct current system inverter side change of current bus if being not less than Commutation failure simultaneously occurs for the multiple-circuit line for being connected to same receiving end AC system；If being less than, a direct current system inversion is determined Three-phase metallicity failure occurs for side change of current bus, only results in the direct current system itself to break down and commutation failure occurs, will not Cause the multiple-circuit line for being connected to same receiving end AC system while commutation failure.

Technical field

The invention belongs to Operation of Electric Systems and planning field, and in particular to commutation failure is sentenced simultaneously for a kind of multiple-circuit line Disconnected method and system.

Background technique

With the development of HVDC Transmission Technology, there is multiple-circuit line transmission system short distance drop point in same AC system Situation, i.e. Multi-infeed HVDC transmission system.In Multi-infeed HVDC transmission system, since electrical couplings are tight between DC inversion station Close, a certain time three-phase metallic short circuit failure occurs for DC inversion side change of current bus, may result in multiple-circuit line commutation simultaneously Failure, will lead to the interruption of multiple-circuit line transimission power when serious, this brings to the safe and stable operation of entire ac and dc systems Huge challenge.Judge that a certain time DC inversion side change of current bus occurs whether three-phase metallic short circuit failure will lead to more times at present The conventional method of commutation failure is that electromechanical transient simulation program is taken to carry out fault scanning, this method calculation amount to direct current system simultaneously Greatly, time-consuming.

Summary of the invention

The judgment method of a kind of multiple-circuit line provided by the invention while commutation failure, comprising:

Mutual impedance of at least two drop points between the direct current system inverter side change of current bus of same AC system is calculated, and The self-impedance of direct current system inverter side change of current bus；

According to mutual impedance of the drop point between the direct current system inverter side change of current bus of same AC system and direct current The self-impedance of system inverter side change of current bus calculates more feed-in interaction factors；

According to more feed-in interaction factors and pre-set general critical more feed-in interaction factor judgements Multiple-circuit line system whether can simultaneously commutation failure.

More feed-in interaction factors are calculated as follows:

Wherein: MIIF_jiMore feed-in interaction factors between direct current system i Inverter Station and direct current system j Inverter Station； Z_eqjiIt is the mutual of direct current system j inverter side change of current bus and direct current system i inverter side change of current bus in node equivalent impedance matrix Impedance；Z_eqiiIt is the self-impedance of direct current system i inverter side change of current bus in node equivalent impedance matrix；J >=1, i >=1.

The setting of general critical more feed-in interaction factors is determined by following formula:

In formula: CMIIF_jiCritical more feed-in reciprocations between direct current system i Inverter Station and direct current system j Inverter Station because Son, U_LiLine voltage, U are run for the inverter side change of current bus of direct current system i_LiNFor the inverter side change of current bus line electricity of direct current system i The rated value of pressure, U_LjLine voltage, U are run for the inverter side change of current bus of direct current system j_LjNFor the inverter side change of current of direct current system j The rated value of bus line voltage, X_Kj% is the percentage of direct current system j converter power transformer short-circuit reactance；I_djFor direct current system j's Steady state run current, I_djNFor the current rating of direct current system j, α_jIt is the operation delayed trigger angle of direct current system j Inverter Station.

The setting of general critical more feed-in interaction factors further include:

Set X_K% value is 15%, U_Li≈U_LiN, U_Lj≈U_LjN, I_dj≈I_djN, α_j142 °~143 ° of ≈；

By X_K%, U_Lj0、U_LjN、U_Lm0、U_LmN、I_dj、I_djNAnd α_jSubstitute into the calculating of critical more feed-in interaction factors In formula, general critical more feed-in interaction factors as follows are calculated:

In formula: GCMIIF_jiGeneral critical more feed-ins between direct current system i Inverter Station and direct current system j Inverter Station interact Acting factor.

It is described according to more feed-in interaction factors and pre-set general critical more feed-in interaction factors Judge multiple-circuit line system whether can simultaneously commutation failure, comprising:

Judge whether more feed-in interaction factors are less than pre-set general critical more feed-in interactions and make Determined that three-phase metallic short circuit failure occurs for a direct current system inverter side change of current bus if being not less than with the factor, will lead to Commutation failure simultaneously occurs for the multiple-circuit line for being connected to same receiving end AC system；If being less than, determine that a direct current system is inverse Become side change of current bus and three-phase metallicity failure occurs, only results in the direct current system itself to break down and commutation failure occurs, no It can cause the multiple-circuit line for being connected to same receiving end AC system while commutation failure.

The judgement system of a kind of multiple-circuit line provided by the invention while commutation failure, comprising:

First computing module, it is female in the direct current system inverter side change of current of same AC system for calculating at least two drop points The self-impedance of mutual impedance and direct current system inverter side change of current bus between line；

Second computing module, for according to the drop point in same AC system direct current system inverter side change of current bus it Between mutual impedance and the self-impedance of direct current system inverter side change of current bus calculate more feed-in interaction factors；

Judgment module, for according to more feed-in interaction factors and pre-set general critical more feed-in interactions Acting factor judge multiple-circuit line system whether can simultaneously commutation failure.

Second computing module is for being calculated as follows more feed-in interaction factors:

Wherein: MIIF_jiMore feed-in interaction factors between direct current system i Inverter Station and direct current system j Inverter Station； Z_eqjiIt is the mutual of direct current system j inverter side change of current bus and direct current system i inverter side change of current bus in node equivalent impedance matrix Impedance；Z_eqiiIt is the self-impedance of direct current system i inverter side change of current bus in node equivalent impedance matrix；J >=1, i >=1.

The judgment module include setting submodule, for be arranged according to the following formula general critical more feed-in reciprocations because Son:

In formula: CMIIF_jiCritical more feed-in reciprocations between direct current system i Inverter Station and direct current system j Inverter Station because Son, U_LiLine voltage, U are run for the inverter side change of current bus of direct current system i_LiNFor the inverter side change of current bus line electricity of direct current system i The rated value of pressure, U_LjLine voltage, U are run for the inverter side change of current bus of direct current system j_LjNFor the inverter side change of current of direct current system j The rated value of bus line voltage, X_Kj% is the percentage of direct current system j converter power transformer short-circuit reactance；I_djFor direct current system j's Steady state run current, I_djNFor the current rating of direct current system j, α_jIt is the operation delayed trigger angle of direct current system j Inverter Station.

The setting submodule is also used to: setting X_K% value is 15%, U_Li≈U_LiN, U_Lj≈U_LjN, I_dj≈I_djN, α_j≈ 142 °~143 °；

By X_K%, U_Lj0、U_LjN、U_Lm0、U_LmN、I_dj、I_djNAnd α_jSubstitute into the calculating of critical more feed-in interaction factors In formula, general critical more feed-in interaction factors as follows are calculated:

In formula: GCMIIF_jiGeneral critical more feed-ins between direct current system i Inverter Station and direct current system j Inverter Station interact Acting factor.

The judgment module is described pre-set general for judging whether more feed-in interaction factors are less than Critical more feed-in interaction factors determine that three-phase metal occurs for a direct current system inverter side change of current bus if being not less than Property short trouble, will lead to be connected to same receiving end AC system multiple-circuit line occur simultaneously commutation failure；If being less than, sentence Three-phase metallicity failure occurs for a fixed direct current system inverter side change of current bus, only results in the direct current system itself to break down Commutation failure occurs, the multiple-circuit line for being connected to same receiving end AC system while commutation failure will not be caused.

Compared with the latest prior art, technical solution provided by the invention has the advantages that

Technical solution provided by the invention, it is only necessary to calculate drop point in the DC transmission system inverter side of same AC system The self-impedance of mutual impedance and direct current system inverter side change of current bus between change of current bus, and it is general critical according to what is provided More feed-in interaction factors can determine whether that multiple-circuit line commutation failure simultaneously can occur, enormously simplify calculating analysis Process shortens time-consuming, more convenient to use.

Detailed description of the invention

Fig. 1 is the judgment method flow chart of a kind of multiple-circuit line provided by the invention while commutation failure；

Fig. 2 is the equivalent system schematic of two feed-ins alternating current-direct current example system provided in an embodiment of the present invention.

Specific embodiment

The present invention will be further described in detail with reference to the accompanying drawing: