CN113675872B - Multi-direct-current simultaneous commutation failure coordination recovery ordering method based on sending end stability constraint - Google Patents
Multi-direct-current simultaneous commutation failure coordination recovery ordering method based on sending end stability constraint Download PDFInfo
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Abstract
The invention belongs to the technical field of power systems and automation thereof, and discloses a multi-direct-current simultaneous commutation failure coordination recovery sequencing method based on sending end stability constraint. Classifying and grouping direct currents in a researched power grid framework, calculating interaction factors among direct currents in a target simultaneous transmission and receiving direct current group, evaluating the interaction degree among the direct currents in the group according to the interaction factors, and selecting the direct current with high coupling degree for optimization; evaluating the direct current intensity of each direct current group of the same-transmitting and receiving direct current, calculating a network equivalence and node impedance matrix according to the data of the researched power grid area, and calculating the multi-feed short circuit ratio of each direct current in the group according to the node impedance matrix; and calculating to obtain the priority index of the multi-direct-current simultaneous phase commutation recovery after the phase commutation failure according to the direct-current strength, the direct-current dynamic reactive power support index and the maximum phase commutation failure frequency, and obtaining the priority sequence of the multi-direct-current coordination recovery from the small and large sequences. The method can provide strategy support for safe and stable operation control of the direct current group and the simultaneous transmission and receiving of the power grid.
Description
Technical Field
The invention belongs to the technical field of power systems and automation thereof, and particularly relates to a multi-direct-current simultaneous commutation failure coordination recovery sequencing method based on sending end stability constraint.
Background
With the increasing maturity of the direct current transmission technology and the great improvement of the economy and the reliability, the direct current transmission technology is widely applied by the technical advantages that the power adjustment is rapid and flexible, and the transmission distance is not limited by the stability of synchronous operation. In recent years, with the operation of large-scale direct current projects, the drop points of direct current transmitting ends and receiving ends are increasingly dense, the coupling effect between alternating current and direct current is enhanced, a large-scale alternating current and direct current hybrid power transmission system is formed, the structure of a power grid is deeply changed, and the characteristics of the power grid are greatly changed.
For a sending-end alternating current system, if a receiving-end alternating current system fails to cause simultaneous phase commutation failure or successive phase commutation failure of direct currents, each direct current will cause power impact on the sending-end alternating current system, and superimposed huge energy impact will cause problems of sending-end voltage, frequency and the like, possibly causing risks of direct current blocking, new energy source off-line and the like. For a receiving-end alternating current system, if the electrical distance of each direct current inversion station is short, the electrical coupling of a current conversion bus is tight, a single alternating current fault can cause multiple direct currents to simultaneously or sequentially generate serious faults such as phase conversion failure and the like, and huge reactive power required in the direct current recovery process can cause the voltage problem of a receiving-end power grid and seriously affect the safe and stable operation of the receiving-end power grid; especially for the access system with simultaneous transmission and receiving of direct current, the failure of simultaneous commutation of multiple direct currents caused by single alternating current fault can cause huge power impact on a transmission end system, and the problem of stable frequency of a transmission end power grid is caused. Therefore, how to optimize the recovery sequence after the simultaneous commutation failure of the same-time transmission and receiving direct current, reduce the power impact of the simultaneous commutation failure of multiple direct currents on the power grid at the transmitting end, and accelerate the recovery of the direct current power after the commutation failure has very important significance on the safe and stable operation of the power grid at the transmitting end.
Disclosure of Invention
The invention provides a sending end stability constraint-based multi-direct-current simultaneous commutation failure coordination recovery sequencing method, which aims to solve the technical problems mentioned in the background technology, comprehensively considers the interaction among direct currents in a sending and receiving direct-current group, the maximum commutation failure times born by the direct currents, a direct-current receiving end converter station and the dynamic reactive power support indexes of a primary section of the direct-current receiving end converter station, provides a multi-direct-current recovery priority sequence under the simultaneous commutation failure faults, and provides strategy support for the safe and stable control of a power grid.
The technical scheme is adopted to solve the technical problems;
a multi-direct-current simultaneous commutation failure coordination recovery sequencing method based on sending end stability constraint comprises the following steps:
step S1: grouping a plurality of direct currents in the power grid frame according to actual power grid data containing a plurality of direct current models and parameters, selecting a simultaneous transmission and receiving direct current group with the largest impact on a transmitting end power grid due to simultaneous commutation failure as a research object, and recording the number of the direct currents in the simultaneous transmission and receiving direct current group as n;
step S2: calculating each direct current interaction factor in the group;
step S2.1: when the ith return direct current is in a rated power operation state, a group of capacitors are switched on a current conversion bus at the inversion side to generate disturbance, so that the voltage of the ith return direct current conversion bus generates a disturbance quantity delta U with the magnitude of 1% i And collecting voltage fluctuation delta U of the commutation bus at the jth return DC inversion side j ；
Step S2.2: taking the disturbance quantity delta U of the ith-turn DC inversion side commutation bus voltage i Voltage fluctuation delta U of commutation bus on jth DC inversion side j The ratio of (d) is between the ith return direct current and the jth return direct currentThe interaction factor of (c);
if the interaction factor is larger than the threshold value K, directly entering step S3; otherwise, the coordination is not needed, and the process is directly finished;
and step S3: calculating the effective short circuit ratio of each direct current in the simultaneous transmission and reception direct current group according to the network equivalence and the node impedance matrix result:
in formula 1, MESCR i The effective short circuit ratio of the ith return direct current; s. the aci Short-circuit capacity of the ith return DC/AC side; q ci The reactive compensation quantity is the reactive compensation quantity connected in parallel on the ith return direct current alternating current side current conversion bus; p deqi The equivalent direct current power after other direct current influences are considered; z is a linear or branched member eqii The equivalent impedance is the i-th return direct current side; z ci The ith return direct current is connected with the equivalent impedance of reactive compensation in parallel; z is a linear or branched member eqij Is the equivalent mutual impedance between the ith return direct current and the jth return direct current; p di The direct current power is the direct current power of the ith return direct current; p dj The j-th return direct current power;
and step S4: calculating dynamic reactive power support indexes of each direct current receiving end converter station and a first-stage section of each direct current receiving end converter station;
step S5: determining the maximum commutation failure times N that each direct current in a transmitting and receiving direct current group can bear according to the stability constraint conditions of a transmitting and receiving end alternating current system, wherein the stability constraint conditions comprise voltage, frequency and power angle;
step S6: calculating a priority index of multi-direct current coordination recovery in the co-transmitting and receiving direct current group according to results obtained in the steps S3, S4 and S5;
step S7: outputting a priority ranking result of multi-direct current coordination recovery in the co-transmitting and receiving direct current group according to the index of the step S6;
further, the simultaneous transmitting and receiving dc group is a plurality of dc with transmitting end falling points in the same synchronous ac system and receiving end falling points in the same synchronous ac system.
Further, the step S1 of selecting the simultaneous transmission and reception dc group with the largest impact on the transmission-side power grid due to the simultaneous commutation failure as a research object refers to determining the simultaneous transmission and reception dc group with the largest impact on the transmission-side power grid according to an offline simulation result of the simultaneous commutation failures of the multiple simultaneous transmission and reception dc groups.
Further, the value of the interaction factor threshold K is 0.15.
Further, the step S4 of calculating the dynamic reactive power support index of each dc receiving end converter station and the first-stage cross section thereof includes:
step S4.1: counting dynamic reactive compensation Q of jth return DC converter station zj Dynamic reactive compensation Q connected with current conversion side bus at one-stage section xj Sum Q sj . The dynamic reactive compensation comprises a phase modulator, a Static Var Compensator (SVC) and a static synchronous compensator (STATCOM).
Step S4.2: and calculating the dynamic reactive power supporting capability of each direct current of the same transmission and reception to the ith return direct current according to the formula 2.
In formula 2, A i Dynamic reactive power supporting capacity of each direct current for sending and receiving the ith return direct current; MIIFij is an interaction factor between the ith return direct current and the jth return direct current; q sj Dynamic reactive compensation Q for jth return DC converter station zj Dynamic reactive compensation Q connected with one-stage section of bus of converter station xj And (4) summing.
Further, the method for calculating the priority index of the multi-dc coordination restoration in step S6 is as follows:
in formula 3, W i The priority index of the ith return direct current recovery; p dci The transmission power of the ith return direct current;
the total power of n simultaneous transmission and receiving direct current transmission; n is a radical of i The maximum commutation failure times which the ith return direct current can bear; MESCR i The effective short circuit ratio of the ith return direct current; a. The i And (5) the ith return direct current dynamic reactive power support index.
Further, the method for determining the priority of the output co-transmission and multi-dc coordinated recovery in step S7 is as follows:
sorting coordination recovery priority indexes of n direct currents sent to and received from the same time into W from small to large 1 、W 2 、W 3 、W 4 ……W n . The smaller the priority index of multi-direct-current coordinated recovery is, the higher the recovery priority of the direct current is, and the larger the priority index is, the lower the recovery priority of the direct current is. The recovery priority of the n direct currents sent and received simultaneously is as follows: w 1 、W 2 、W 3 、W 4 ……W n 。
Compared with the prior art, the invention has the beneficial effects that: considering that the drop points of the direct current sending end and the receiving end are increasingly dense and the electrical coupling effect is gradually tight, the failure of one direct current commutation may cause the simultaneous commutation failure of other multiple direct currents with strong electrical coupling effect, and great power impact is caused to the power grid to seriously affect the risk of safe and stable operation of the power grid. Therefore, the invention provides a sending end stability constraint-based multi-direct-current simultaneous commutation failure coordination recovery sequencing method, which comprehensively considers the interaction between direct currents in a sending and receiving direct-current group, the maximum commutation failure times born by the direct currents, a direct-current receiving end converter station and a dynamic reactive power support index of a primary section of the direct-current receiving end converter station, gives the priority of multi-direct-current coordination recovery under simultaneous commutation failure, can maximize multi-direct-current recovery efficiency, reduces the power impact of the simultaneous commutation failure of the sending and receiving direct-current group on a sending end power grid, and provides strategy support for the safety and stability control of the power grid.
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FIG. 1 is a flow chart of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to FIG. 1, a preferred embodiment of the present invention will be further described;
the coordination recovery ordering method for multiple direct current simultaneous commutation failures based on sending end stability constraint comprises the following steps:
step S1: according to actual power grid data containing multiple direct current models and parameters, grouping multiple direct currents in the power grid framework, selecting a simultaneous-transmission and simultaneous-reception direct current group with the largest impact on a transmitting-end power grid due to simultaneous commutation failure as a research object, and recording the number of direct current bars in the simultaneous-transmission and simultaneous-reception direct current group as n. Wherein, the simultaneous transmitting and receiving direct current group is a plurality of direct currents of which the transmitting end is located in the same synchronous alternating current system and the receiving end is located in the same synchronous alternating current system; the simultaneous transmission and reception direct-current group with the largest impact on the power grid of the transmitting end due to the phase change failure is determined according to an off-line simulation result of the simultaneous phase change failure of the multiple simultaneous transmission and reception direct-current groups.
Step S2: and calculating each direct current interaction factor in the group. Firstly, according to the rated power running state of the ith return direct current transmission system, a group of capacitors is switched on a current conversion bus on the inversion side to generate disturbance, so that the voltage of the ith return direct current conversion bus generates a disturbance quantity delta U with the magnitude of 1 percent i And collecting voltage fluctuation delta U of the current conversion bus at the jth return DC inversion side j . Secondly, the disturbance quantity delta U of the ith return DC inversion side commutation bus voltage is taken i Voltage fluctuation delta U of commutation bus on jth DC inversion side j The ratio of (d) is the interaction factor between the ith return direct current and the jth return direct current. Finally, if the interaction factor is larger than the threshold value K (the value can be taken according to the actual engineering situation, and usually can be taken as 0.15), directly entering the step S3; otherwise, the coordination is not needed, and the process is finished directly.
And S3, calculating the effective short circuit ratio of each direct current in the simultaneous transmission and reception direct current group according to the network equivalence and the node impedance matrix result.
In formula 1, MESCR i The effective short circuit ratio of the ith return direct current; s aci The short-circuit capacity of the ith return direct current side; q ci The reactive compensation quantity is parallel connected on the ith return direct current alternating current side conversion bus; p is deqi The equivalent direct current power after other direct current influences are considered; z eqii The equivalent impedance is the ith return direct current side; z ci The ith return direct current is connected with equivalent impedance of reactive compensation in parallel; z eqij The equivalent mutual impedance between the ith return direct current and the jth return direct current alternating current side; p di The direct current power of the ith return direct current is; p dj J, returning the direct current power of the direct current.
And step S4: and calculating the dynamic reactive power support indexes of each direct current receiving end converter station and the first-stage section of the direct current receiving end converter station. The calculation of the dynamic reactive power support indexes of the direct current receiving end converter stations and the first-stage sections thereof comprises the following steps: counting dynamic reactive compensation Q of jth return DC converter station zj Dynamic reactive compensation Q connected with current conversion side bus at one-stage section xj Sum Q sj . The dynamic reactive compensation comprises a phase modulator, a Static Var Compensator (SVC) and a static synchronous compensator (STATCOM).
And calculating the dynamic reactive power supporting capability of each direct current of the same transmission and reception to the ith return direct current according to the formula 2.
In the formula 2, A i Dynamic reactive power supporting capacity of each direct current pair ith return direct current for simultaneous transmission and reception; MIIFij is an interaction factor between the ith return direct current and the jth return direct current; q sj Dynamic reactive compensation Q for jth return DC converter station zj Dynamic reactive compensation Q of one-level section connected with bus of converter station xj And (4) summing.
Step S5: and determining the maximum commutation failure times N which can be borne by each direct current in the same-transmitting and receiving direct current groups according to the stability constraint conditions of the transmitting and receiving end alternating current systems, wherein the stability constraint conditions comprise voltage, frequency and power angle.
Step S6: and calculating the priority index of the multi-direct-current coordination recovery in the co-transmitting and receiving direct-current group according to the results obtained in the S3, the S4 and the S5. The method for calculating the priority indexes of multi-direct-current coordination recovery comprises the following steps:
in formula 3, W i The priority index of the ith return direct current recovery; p dci The transmission power of the ith return direct current;
the sum of the power of n simultaneous transmission and receiving direct current transmission; n is a radical of i The maximum commutation failure times which can be borne by the ith return direct current are set; MESCR i The effective short circuit ratio of the ith return direct current; a. The i And (5) returning to the dynamic reactive power support index of the direct current.
Step S7: and outputting a priority ranking result of multi-direct current coordination recovery in the co-transmitting and receiving direct current group according to the index in the step S6. The priority sequencing determination method for the simultaneous transmission and reception multi-direct-current coordination recovery comprises the following steps:
the recovery priority indexes of n direct currents sent and received simultaneously are sorted from small to large into W1, W2, W3 and W4 \8230, 8230and Wn. The smaller the priority index of multi-direct-current coordinated recovery is, the higher the recovery priority of the direct current is, and the larger the priority index is, the lower the recovery priority of the direct current is. The recovery priority of the n direct currents sent and received simultaneously is as follows: w1, W2, W3, W4 \8230, 8230and Wn.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A multi-direct-current simultaneous commutation failure coordination recovery sequencing method based on sending end stability constraint is characterized in that: the method comprises the following steps:
step S1: grouping a plurality of direct currents in the power grid frame according to actual power grid data containing a plurality of direct current models and parameters, selecting a simultaneous transmission and receiving direct current group with the largest impact on a transmitting end power grid due to simultaneous commutation failure as a research object, and recording the number of the direct currents in the simultaneous transmission and receiving direct current group as n;
step S2: calculating each direct current interaction factor in the group;
step S2.1: when the ith return direct current is in a rated power running state, a group of capacitors is switched on a current conversion bus at the inversion side to generate disturbance, so that the voltage of the ith return direct current conversion bus generates a disturbance quantity delta U with the magnitude of 1 percent i And collecting voltage fluctuation delta U of the commutation bus at the jth return DC inversion side j ；
Step S2.2: taking the disturbance quantity delta U of the ith-turn DC inversion side commutation bus voltage i Voltage fluctuation delta U of commutation bus on jth DC inversion side j The ratio of (a) to (b) is an interaction factor between the ith return direct current and the jth return direct current;
if the interaction factor is larger than the threshold value K, directly entering the step S3; otherwise, the coordination is not needed, and the process is directly finished;
and step S3: calculating the effective short circuit ratio of each direct current in the simultaneous transmission and reception direct current cluster according to the network equivalence and node impedance matrix result:
in formula 1, MESCR i The effective short circuit ratio of the ith return direct current; s aci Short-circuit capacity of the ith return DC/AC side; q ci The reactive compensation quantity is parallel connected on the ith return direct current alternating current side conversion bus; p deqi The equivalent direct current power after other direct current influences are considered; z eqii The equivalent impedance is the i-th return direct current side; z ci The ith return direct current is connected with equivalent impedance of reactive compensation in parallel; z is a linear or branched member eqij The equivalent mutual impedance between the ith return direct current and the jth return direct current alternating current side; p di The direct current power of the ith return direct current is; p dj The j-th return direct current power;
and step S4: calculating dynamic reactive power support indexes of each direct current receiving end converter station and a first-stage section of each direct current receiving end converter station;
step S5: determining the maximum commutation failure times N that each direct current in a transmitting and receiving direct current group can bear according to the stability constraint conditions of a transmitting and receiving end alternating current system, wherein the stability constraint conditions comprise voltage, frequency and power angle;
step S6: calculating a priority index of multi-direct current coordination recovery in the co-transmitting and receiving direct current group according to results obtained in the steps S3, S4 and S5;
the method for calculating the priority index of the multi-dc coordination recovery in step S6 is as follows:
in formula 3, W i The priority index of the ith return direct current recovery; p dci The transmission power of the ith return direct current is;
the sum of the power of n simultaneous transmission and receiving direct current transmission; n is a radical of i The maximum commutation failure times which can be borne by the ith return direct current are set; a. The i And (5) returning to the dynamic reactive power support index of the direct current.
Step S7: and outputting a priority ranking result of multi-direct current coordination recovery in the co-transmitting and receiving direct current group according to the index in the step S6.
2. The sending-end stability constraint-based multi-direct-current simultaneous commutation failure coordination recovery ordering method according to claim 1, characterized in that: the simultaneous-transmitting and simultaneous-receiving direct current group is a plurality of direct currents of which the transmitting end is located in the same synchronous alternating current system and the receiving end is located in the same synchronous alternating current system.
3. The sending-end stability constraint-based multi-direct-current simultaneous commutation failure coordination recovery sequencing method according to claim 1, characterized in that: the step S1 of selecting the simultaneous transmission and reception dc group with the largest impact on the transmission-side power grid due to the simultaneous commutation failure as a research object means determining the simultaneous transmission and reception dc group with the largest impact on the transmission-side power grid according to an offline simulation result of the simultaneous commutation failures of the multiple simultaneous transmission and reception dc groups.
4. The sending-end stability constraint-based multi-direct-current simultaneous commutation failure coordination recovery sequencing method according to claim 1, characterized in that: the value of the interaction factor threshold K is 0.15.
5. The sending-end stability constraint-based multi-direct-current simultaneous commutation failure coordination recovery ordering method according to claim 1, characterized in that: the step S4 of calculating the dynamic reactive power support index of each dc receiving end converter station and the first-stage cross section thereof includes:
step S4.1: counting dynamic reactive compensation Q of jth return direct current converter station zj Dynamic reactive compensation Q connected with current conversion side bus at one-stage section xj Sum Q sj (ii) a The dynamic reactive compensation comprises a phase modulator, a Static Var Compensator (SVC) and a static synchronous compensator (STATCOM);
step S4.2: calculating the dynamic reactive power support capability of each direct current pair i return direct current of the same transmission and reception according to the formula 2;
in the formula 2, A i Dynamic reactive power supporting capacity of each direct current pair ith return direct current for simultaneous transmission and reception; MIIFij is an interaction factor between the ith return direct current and the jth return direct current; q sj Dynamic reactive compensation Q for jth return DC converter station zj Dynamic reactive compensation Q connected with current conversion side bus for one-stage section xj And (4) the sum.
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