CN111488677B - Multi-feed-in effective short-circuit ratio analysis method and device, terminal equipment and storage medium - Google Patents
Multi-feed-in effective short-circuit ratio analysis method and device, terminal equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a multi-feed-in effective short circuit ratio analysis method, which comprises the following steps: determining the maximum reactive output quantity of the flexible direct current, and acquiring a voltage and current value of a conventional direct current drop point and a voltage and current value of the flexible direct current drop point; calculating the promotion quantity of the short circuit capacity of each conventional direct current drop point after the flexible direct current is accessed according to the maximum reactive output quantity of the flexible direct current, the voltage and current value of the conventional direct current drop point and the voltage and current value of the flexible direct current drop point; calculating a multi-direct current feed-in interaction factor; according to the lifting amount and the multi-direct-current feed-in interaction factors, the multi-feed-in effective short-circuit ratio of the flexible direct current access is calculated, the problem that the multi-feed-in effective short-circuit ratio of the flexible direct current cannot be considered in the prior art, and the influence of the flexible direct current on the conventional direct-current multi-feed-in effective short-circuit ratio cannot be calculated is effectively solved, and the mutual influence among the multi-loop direct currents is comprehensively and effectively measured. The invention discloses a multi-feed-in effective short circuit ratio analysis device, terminal equipment and a storage medium.
Description
Technical Field
The invention relates to the technical field of flexible direct current and multi-direct current feed-in power grids, in particular to a multi-feed-in effective short-circuit ratio analysis method, a multi-feed-in effective short-circuit ratio analysis device, terminal equipment and a storage medium.
Background
At present, dozens of direct current transmission projects are put into operation in China, the transmission capacity exceeds 50% of the total capacity of the direct current transmission projects built in the world, and a plurality of direct current feed-in power grids in east China, south China and the like are formed. In the future, as the flexible direct current transmission technology matures, the flexible direct current and the conventional direct current share the transmission task.
The multi-feed effective short circuit ratio can reflect the interaction between the direct current systems, and is one of important indexes for analyzing and evaluating the strength of the multi-feed direct current system. However, at present, the multi-feed effective short-circuit ratio of the flexible direct current cannot be considered, and the influence of the flexible direct current on the conventional direct current multi-feed effective short-circuit ratio cannot be calculated.
In the load flow calculation, a node where the flexible direct current is located is generally processed into a PV node with reactive power constraint, and the reactive power output of the node where the flexible direct current is located is arranged according to the reactive power balance requirement; the short circuit capacity calculation only takes the influence of the active power of the node where the flexible direct current is located into account, and the influence of the flexible direct current on the short circuit capacity of other nodes of the system cannot be comprehensively reflected.
Disclosure of Invention
The embodiment of the invention provides a multi-feed-in effective short-circuit ratio analysis method, a multi-feed-in effective short-circuit ratio analysis device, terminal equipment and a storage medium, which can effectively solve the problems that the multi-feed-in effective short-circuit ratio of flexible direct current cannot be considered and the influence of the flexible direct current on the conventional direct current multi-feed-in effective short-circuit ratio cannot be calculated in the prior art, realize comprehensive and effective measurement of mutual influence among multi-loop direct currents, and effectively improve the running stability of a multi-direct current feed-in power grid.
An embodiment of the present invention provides a method for analyzing a multi-feed effective short-circuit ratio, including:
determining the maximum reactive output quantity of the flexible direct current, and acquiring a voltage and current value of a conventional direct current drop point and a voltage and current value of the flexible direct current drop point;
calculating the lifting amount of the short circuit capacity of each conventional direct current drop point after the flexible direct current is accessed according to the flexible direct current maximum reactive output quantity, the conventional direct current drop point voltage current value and the flexible direct current drop point voltage current value;
calculating a multi-direct current feed-in interaction factor;
and calculating the multi-feed-in effective short-circuit ratio of the flexible direct current access according to the lifting amount and the multi-direct current feed-in interaction factor.
As an improvement of the above scheme, the calculating, according to the maximum flexible dc reactive output, the conventional dc drop point voltage current, and the flexible dc drop point voltage current, a boost of the short-circuit capacity of each conventional dc drop point after the flexible dc is connected to the converter specifically includes:
calculating the self-impedance of each conventional direct current drop point according to the voltage and current values of the conventional direct current drop points;
calculating the mutual impedance between each conventional direct current drop point and the flexible direct current drop point according to the voltage and current values of the conventional direct current drop points and the voltage and current values of the flexible direct current drop points;
and calculating the lifting amount of the short circuit capacity of each conventional direct current drop point after the flexible direct current is accessed according to the maximum reactive output quantity of the flexible direct current, the self impedance of the conventional direct current drop point and the mutual impedance between each conventional direct current drop point and the flexible direct current drop point.
As an improvement of the above scheme, the calculating the multiple direct current feed interaction factor specifically includes:
calculating the mutual impedance between each conventional direct current drop point and other conventional direct current drop points according to the voltage and current values of the conventional direct current drop points;
and calculating the multi-direct-current feed-in interaction factor according to the self impedance of each conventional direct-current drop point and the mutual impedance between each conventional direct-current drop point and other conventional direct-current drop points.
As an improvement of the above scheme, the calculating, according to the lifting amount and the multi-dc-feed interaction factor, a multi-feed effective short-circuit ratio of flexible dc access is calculated, specifically including:
acquiring the short-circuit capacity of a conventional direct current drop point when the flexible direct current access is not considered, and the reactive power of a filter and a parallel capacitor in a converter station at the conventional direct current drop point;
calculating the short circuit capacity of the conventional direct current drop point after the flexible direct current is accessed according to the short circuit capacity of the conventional direct current drop point when the flexible direct current is not considered, the reactive power and the lifting amount;
acquiring active power of any two conventional direct current lines and the total number of the conventional direct current lines;
and calculating the multi-feed-in effective short-circuit ratio of the flexible direct current access according to the active power of the conventional direct current line, the total number of the conventional direct current lines and the multi-direct current feed-in interaction factor.
As an improvement of the above scheme, the calculating, according to the maximum reactive output of the flexible direct current, the self impedance of the conventional direct current drop point, and the mutual impedance between the conventional direct current drop points and the flexible direct current drop point, the boost amount of the short circuit capacity of each conventional direct current drop point after the flexible direct current is connected to the flexible direct current specifically includes:
the improvement amount of the short circuit capacity of each conventional direct current drop point after the flexible direct current is accessed is obtained by the following formula, and the specific formula is as follows:
wherein, Delta SijFor the lift amount, ZijIs the mutual impedance, Z, between the conventional DC drop point i and the flexible DC drop point jiiIs the self-impedance of the conventional DC drop point, QjmaxThe maximum reactive output of the flexible direct current drop point j.
As an improvement of the above solution, the calculating, according to the lifting amount and the multi-dc-feed interaction factor, a multi-feed effective short-circuit ratio of flexible dc access is calculated, and the method further includes:
the short circuit capacity of the conventional direct current drop point after the flexible direct current is accessed is obtained by the following formula, and the specific formula is as follows:
wherein, S'aciIs the short circuit capacity, S, at the conventional DC drop point after the flexible DC accessaciFor said short circuit capacity at a conventional dc drop point irrespective of flexible dc access;
the multi-feed-in effective short circuit ratio considering the flexible direct current access is obtained by the following formula, and the specific formula is as follows:
wherein, ISMIESCRiFor the multi-feed effective short-circuit ratio, P, taking into account the flexible DC accessdiIs a conventional DC lineActive power of i, PdkIs the active power of a conventional DC line k, MIIFijFor the multi-DC feed interaction factor, N, between the conventional DC drop point i and the other conventional DC drop points kiIs the total number of the conventional direct current lines.
Another embodiment of the present invention correspondingly provides a multi-feed effective short-circuit ratio analysis apparatus, including:
the data acquisition module is used for determining the maximum reactive output quantity of the flexible direct current and acquiring the voltage and current values of the conventional direct current drop point and the flexible direct current drop point;
the lifting amount calculation module is used for calculating the lifting amount of the short circuit capacity of each conventional direct current falling point after the flexible direct current is accessed according to the flexible direct current maximum reactive output amount, the conventional direct current falling point voltage current value and the flexible direct current falling point voltage current value;
the interaction factor calculation module is used for calculating the multi-direct current feed-in interaction factors;
and the multi-feed-in effective short-circuit ratio calculation module is used for calculating the multi-feed-in effective short-circuit ratio of the flexible direct current access according to the lifting amount and the multi-direct current feed-in interaction factors.
Another embodiment of the present invention provides a multi-feed effective short-circuit ratio analysis terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the multi-feed effective short-circuit ratio analysis terminal device implements the multi-feed effective short-circuit ratio analysis method described in the above embodiment of the present invention.
Another embodiment of the present invention provides a storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the method for analyzing the effective short-circuit ratio of multi-feed according to the above embodiment of the present invention.
Compared with the prior art, the multi-feed-in effective short-circuit ratio analysis method, the multi-feed-in effective short-circuit ratio analysis device, the terminal equipment and the storage medium disclosed by the embodiment of the invention have the following beneficial effects:
by determining the maximum reactive output quantity of the flexible direct current, obtaining the voltage and current values of the conventional direct current drop points and the voltage and current values of the flexible direct current drop points, further calculating the promotion quantity of the short-circuit capacity of each conventional direct current drop point after the flexible direct current is accessed according to the maximum reactive output quantity of the flexible direct current, the voltage and current values of the conventional direct current drop points and the voltage and current values of the flexible direct current drop points, then calculating a multi-direct-current-fed interaction factor, and calculating the multi-fed effective short-circuit ratio of the flexible direct current access according to the promotion quantity and the multi-direct-current-fed interaction factor, the problems that the multi-fed effective short-circuit ratio of the flexible direct current cannot be considered and the influence of the flexible direct current on the conventional direct-current-fed effective short-circuit ratio cannot be calculated in the prior art can be effectively solved, the mutual influence between the multi-fed direct currents can be comprehensively and effectively measured, and the influence of the flexible direct current on the short-circuit capacity of other nodes of the system can be comprehensively reflected, therefore, an effective analysis method is provided for planning the multi-direct-current feed-in power grid, the accuracy and the rationality of the multi-direct-current feed-in power grid planning can be effectively improved, and the running stability of the multi-direct-current feed-in power grid is effectively improved.
Drawings
FIG. 1 is a schematic flow chart of a multi-feed effective short-circuit ratio analysis method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a multi-feed effective short-circuit ratio analysis apparatus according to a second embodiment 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, a schematic flow chart of a multi-feed effective short-circuit ratio analysis method according to an embodiment of the present invention is shown, where the method includes steps S101 to S104.
S101, determining the maximum reactive output quantity of the flexible direct current, and obtaining a voltage and current value of a conventional direct current drop point and a voltage and current value of the flexible direct current drop point.
It should be noted that active and reactive components of a receiving end of the flexible direct current transmission system can be independently controlled, and when the voltage on the alternating current side is low or high, the flexible direct current can regulate the alternating voltage by outputting or absorbing the reactive power. Reactive power which can be output or absorbed by the flexible direct current is related to factors such as the capability of a flexible direct current device, a control mode and the like, and finally the short circuit capacity of a flexible direct current drop point is influenced. Therefore, the flexible dc maximum reactive output capability (i.e. the flexible dc maximum reactive output in this embodiment) needs to be determined according to engineering practice.
S102, calculating the lifting amount of short circuit capacity of each conventional direct current drop point after the flexible direct current is connected according to the flexible direct current maximum reactive output amount, the conventional direct current drop point voltage current value and the flexible direct current drop point voltage current value.
In a preferred embodiment, step S102 specifically includes:
calculating the self-impedance of each conventional direct current drop point according to the voltage and current values of the conventional direct current drop points;
calculating the mutual impedance between each conventional direct current drop point and the flexible direct current drop point according to the voltage and current values of the conventional direct current drop points and the voltage and current values of the flexible direct current drop points;
and calculating the lifting amount of the short circuit capacity of each conventional direct current drop point after the flexible direct current is accessed according to the maximum reactive output quantity of the flexible direct current, the self impedance of the conventional direct current drop point and the mutual impedance between each conventional direct current drop point and the flexible direct current drop point.
For a network with N independent nodes, the node admittance equation can be obtained: YV ═ I; y, V, I are a node admittance matrix, a node voltage matrix, and a node current matrix, respectively.
Further, after the node admittance equation is developed, the node admittance equation is:
wherein, YiiIs the self-admittance of the node i, and the value of the self-admittance is equal to the sum of all branch admittance connected with the node i; y isijIs the mutual admittance between node i and node j, whose value is equal to the negative value of the admittance of the branch directly connected between nodes i, j.
Respectively, a voltage vector and a current vector of node i.
Inverting the node admittance matrix Y to obtain a node impedance matrix Z, i.e. Z ═ Y-1The expansion formula is:
therefore, assuming that the conventional direct current drop point is i and the flexible direct current drop point is j, the admittance of the conventional direct current drop point i is calculated according to the obtained voltage and current values of the conventional direct current drop point i, and then the self-impedance of each conventional direct current drop point is calculated according to the admittance of the conventional direct current drop point i. Similarly, according to the obtained voltage and current values of the conventional direct current drop point i and the flexible direct current drop point j, the admittance between the conventional direct current drop point i and the flexible direct current drop point j is calculated, and then the mutual impedance between the conventional direct current drop point i and the flexible direct current drop point j is calculated to be Zij。
Further, preferably, the boost of the short-circuit capacity of each conventional dc drop point after the flexible dc access is obtained by the following formula, and the specific formula is as follows:
wherein, Delta SijFor the lift amount, ZijIs the mutual impedance, Z, between the conventional DC drop point i and the flexible DC drop point jiiIs the self-impedance of the conventional DC drop point, QjmaxIs the maximum absence of the flexible direct current drop point jThe amount of work output.
And S103, calculating the interaction factors of the multiple direct current feeds.
In a preferred embodiment, step S103 specifically includes:
calculating the mutual impedance between each conventional direct current drop point and other conventional direct current drop points according to the voltage and current values of the conventional direct current drop points;
and calculating the multi-direct-current feed-in interaction factor according to the self impedance of each conventional direct-current drop point and the mutual impedance between each conventional direct-current drop point and other conventional direct-current drop points.
It should be noted that, with reference to the calculation method of the mutual impedance in step S102, the mutual impedance between each conventional dc drop point and other conventional dc drop points is calculated according to the voltage and current values of the conventional dc drop points. Furthermore, the multi-DC feed interaction factor MIIF between the conventional DC drop point i and the other conventional DC drop points kikSatisfy the following requirements
Wherein ZikIs the mutual impedance between each conventional DC drop point and other conventional DC drop points.
And S104, calculating the multi-feed-in effective short-circuit ratio of the flexible direct current access according to the lifting amount and the multi-direct current feed-in interaction factor.
In a preferred embodiment, step S104 specifically includes:
acquiring the short-circuit capacity of a conventional direct current drop point when the flexible direct current access is not considered, and the reactive power of a filter and a parallel capacitor in a converter station at the conventional direct current drop point;
calculating the short circuit capacity of the conventional direct current drop point after the flexible direct current is accessed according to the short circuit capacity of the conventional direct current drop point when the flexible direct current is not considered, the reactive power and the lifting amount;
acquiring active power of any two conventional direct current lines and the total number of the conventional direct current lines;
and calculating the multi-feed-in effective short-circuit ratio of the flexible direct current access according to the active power of the conventional direct current line, the total number of the conventional direct current lines and the multi-direct current feed-in interaction factor.
Further, preferably, the short circuit capacity at the conventional dc drop point after the flexible dc access is obtained by the following formula, specifically the formula is as follows:
wherein, S'aciIs the short circuit capacity, S, at the conventional DC drop point after the flexible DC accessaciFor said short circuit capacity at a conventional dc drop point irrespective of flexible dc access;
the multi-feed-in effective short circuit ratio considering the flexible direct current access is obtained by the following formula, and the specific formula is as follows:
the above formula expands to be:
wherein, ISMIESCRiFor the multi-feed effective short-circuit ratio, P, taking into account the flexible DC accessdiActive power, P, of a conventional DC line idkIs the active power of a conventional DC line k, MIIFikFor the multi-DC feed interaction factor, N, between the conventional DC drop point i and the other conventional DC drop points kiIs the total number of the conventional direct current lines.
In the method for analyzing the multi-feed-in effective short-circuit ratio provided by the embodiment of the invention, the flexible direct-current maximum reactive output quantity is determined, the conventional direct-current drop point voltage current value and the flexible direct-current drop point voltage current value are obtained, the boost quantity of the short-circuit capacity of each conventional direct-current drop point after the flexible direct current is accessed is calculated according to the flexible direct-current maximum reactive output quantity, the conventional direct-current drop point voltage current value and the flexible direct-current drop point voltage current value, then the multi-direct-current feed-in interaction factor is calculated, and the multi-feed-in effective short-circuit ratio of the flexible direct current access is calculated according to the boost quantity and the multi-direct-current feed-in interaction factor, so that the problems that the multi-feed-in effective short-circuit ratio of the flexible direct current cannot be considered and the influence of the flexible direct current on the conventional direct-current multi-feed-in effective short-circuit ratio cannot be calculated in the prior art are solved effectively, the method can comprehensively and effectively measure the mutual influence between the multiple direct currents, and can comprehensively reflect the influence of the flexible direct currents on the short-circuit capacity of other nodes of the system, so that an effective analysis method is provided for planning the multiple direct current feed-in power grid, the accuracy and the rationality of the planning of the multiple direct current feed-in power grid can be effectively improved, and the running stability of the multiple direct current feed-in power grid is effectively improved.
Illustratively, on the basis of the above embodiments, the multi-feed effective short-circuit ratio analysis method is applied to an actual power grid, taking a multi-direct-current feed power grid in the guangdong as an example.
S1: the multi-direct-current feed-in power grid of Guangdong has eight direct-current feed-in circuits, namely a cattle direct current, a general direct current, a Chu ear direct current, a Xingan direct current, a Tianguan direct current, a GaoZuan direct current, a Sanguan direct current and a Yunnan northwest direct current, and the corresponding eight direct-current inversion stations are a Xiguang station, a Qiao county station, a Tuonang station, a Baoan station, a Beisuburb station, a Zhaoqing station, a goose city and an east station.
After the flexible direct current of the Kunlilong is connected to the Guangdong power grid, the maximum reactive power output capacity is 500Mvar, and the lifting amount of other eight-loop conventional direct current short-circuit capacity is calculated as shown in the following table 1.
| Serial number | DC line name | Short circuit capacity boost (MVA) |
| 1 | DC of cow | 102 |
| 2 | General DC | 0.7 |
| 3 | DC of Chu ear | 367 |
| 4 | Xingan DC | 36 |
| 5 | Tianguang DC | 91 |
| 6 | High DC | 1.3 |
| 7 | Three wide direct current | 298 |
| 8 | Yunnan northwest direct current | 33 |
TABLE 1
S2: the self-impedance and the mutual impedance between the eight conventional dc drop points are calculated, and the multi-dc-feed interaction factor matrix can be obtained as shown in table 2 below.
TABLE 2
S3: the effective short circuit ratio of the multi-feed of eight conventional direct currents before and after the flexible direct current access of the kunlilon is shown in table 3.
| Serial number | Name of inversion station | IMIESCRi | ISMIESCRi |
| 1 | Three wide direct current | 6.02 | 6.23 |
| 2 | Xingan DC | 5.13 | 5.17 |
| 3 | High DC | 5.09 | 5.10 |
| 4 | Tianguang DC | 4.08 | 4.16 |
| 5 | DC of Chu ear | 4.52 | 4.88 |
| 6 | Yunnan northwest direct current | 5.11 | 5.15 |
| 7 | DC of cow | 4.37 | 4.45 |
| 8 | General DC | 6.26 | 6.26 |
TABLE 3
Wherein, IMIESCRiThe effective short-circuit ratio of the multi-feed without flexible direct current is obtained. The results in table 3 show that after the flexible direct current is connected to the power grid, the multi-feed effective short-circuit ratio of the conventional direct current can be improved, and the improvement amount has a positive correlation with the electrical distance between the flexible direct current access point and the conventional direct current drop point.
Example two
Referring to fig. 2, a schematic structural diagram of a multi-feed effective short-circuit ratio analysis apparatus according to a second embodiment of the present invention is shown, including:
the data acquisition module 201 is configured to determine a maximum flexible direct current reactive output, and acquire a conventional direct current drop voltage current value and a flexible direct current drop voltage current value;
a boost calculation module 202, configured to calculate a boost of a short-circuit capacity of each conventional dc drop point after the flexible dc is connected to the flexible dc according to the flexible dc maximum reactive output, the conventional dc drop point voltage current value, and the flexible dc drop point voltage current value;
an interaction factor calculation module 203, configured to calculate a multiple direct current feed interaction factor;
and a multi-feed effective short-circuit ratio calculation module 204, configured to calculate a multi-feed effective short-circuit ratio considering the flexible dc access according to the boost amount and the multi-dc feed interaction factor.
Preferably, the lifting amount calculating module 202 includes:
the self-impedance calculation unit of the conventional direct current drop point is used for calculating the self-impedance of each conventional direct current drop point according to the voltage and current values of the conventional direct current drop point;
the mutual impedance calculation unit between the conventional direct current and the flexible direct current drop points is used for calculating the mutual impedance between each conventional direct current drop point and each flexible direct current drop point according to the voltage and current values of the conventional direct current drop points and the voltage and current values of the flexible direct current drop points;
and the first lifting amount calculating unit is used for calculating the lifting amount of the short circuit capacity of each conventional direct current drop point after the flexible direct current is accessed according to the maximum reactive output amount of the flexible direct current, the self impedance of the conventional direct current drop point and the mutual impedance between each conventional direct current drop point and the flexible direct current drop point.
Preferably, the interaction factor calculation module 203 includes:
the mutual impedance calculation unit between the conventional direct current falling points is used for calculating the mutual impedance between the conventional direct current falling points and other conventional direct current falling points according to the voltage and current values of the conventional direct current falling points;
and the multi-direct-current feed-in interaction factor calculation unit is used for calculating the multi-direct-current feed-in interaction factors according to the self impedance of each conventional direct-current drop point and the mutual impedance between each conventional direct-current drop point and other conventional direct-current drop points.
Preferably, the multi-feed effective short circuit ratio calculation module 204 includes:
the device comprises a conventional direct current drop point data acquisition unit, a common direct current drop point data acquisition unit and a common direct current drop point data acquisition unit, wherein the conventional direct current drop point data acquisition unit is used for acquiring the short circuit capacity of the conventional direct current drop point when the flexible direct current is not considered to be accessed, and the reactive power of a filter and a parallel capacitor in a converter station at the conventional direct current drop point;
the short-circuit capacity calculation unit is used for calculating the short-circuit capacity of the conventional direct current drop point after the flexible direct current is accessed according to the short-circuit capacity of the conventional direct current drop point when the flexible direct current is not considered, the reactive power and the boost quantity;
the system comprises a conventional direct current line data acquisition unit, a power control unit and a power control unit, wherein the conventional direct current line data acquisition unit is used for acquiring active power of any two conventional direct current lines and the total number of the conventional direct current lines;
the first multi-feed-in effective short-circuit ratio calculation unit considering the flexible direct-current access is used for calculating the multi-feed-in effective short-circuit ratio considering the flexible direct-current access according to the active power of the conventional direct-current line, the total number of the conventional direct-current line and the multi-direct-current feed-in interaction factor.
Preferably, the lifting amount calculation module 202 further comprises:
the second lifting amount calculating unit is used for obtaining the lifting amount of the short circuit capacity of each conventional direct current drop point after the flexible direct current is accessed by the following formula, and the specific formula is as follows:
wherein, Delta SijFor the lift amount, ZijIs the mutual impedance, Z, between the conventional DC drop point i and the flexible DC drop point jiiIs the self-impedance of the conventional DC drop point, QjmaxThe maximum reactive output of the flexible direct current drop point j.
Preferably, the multi-feed effective short-circuit ratio calculation module 204 further includes:
the short circuit capacity calculation unit of the conventional direct current drop point after the second flexible direct current is accessed is used for obtaining the short circuit capacity of the conventional direct current drop point after the flexible direct current is accessed by the following formula, wherein the specific formula is as follows:
wherein, S'aciIs the short circuit capacity, S, at the conventional DC drop point after the flexible DC accessaciFor said short circuit capacity at a conventional dc drop point irrespective of flexible dc access;
the first multi-feed-in effective short circuit ratio calculation unit considering the flexible direct current access is used for obtaining the multi-feed-in effective short circuit ratio considering the flexible direct current access according to the following formula, wherein the specific formula is as follows:
wherein, ISMIEsCRiFor the multi-feed effective short-circuit ratio, P, taking into account the flexible DC accessdiActive power, P, of a conventional DC line idkIs the active power of a conventional DC line k, MIIFikFor the multi-DC feed interaction factor, N, between the conventional DC drop point i and the other conventional DC drop points kiIs the total number of the conventional direct current lines.
In the multi-feed-in effective short-circuit ratio analysis device provided by the second embodiment of the present invention, by determining the maximum reactive output of the flexible dc, obtaining the voltage and current values of the conventional dc drop point and the voltage and current values of the flexible dc drop point, calculating the boost of the short-circuit capacity of each conventional dc drop point after the flexible dc is connected according to the maximum reactive output of the flexible dc, the voltage and current values of the conventional dc drop point and the voltage and current values of the flexible dc drop point, and then calculating the multi-dc feed-in interaction factor, calculating and calculating the multi-feed-in effective short-circuit ratio of the flexible dc connection according to the boost and the multi-dc feed-in interaction factor, the problem in the prior art that the multi-feed-in effective short-circuit ratio of the flexible dc cannot be considered, and the influence of the flexible dc on the conventional multi-feed-in effective short-circuit ratio cannot be calculated can be effectively solved, the method can comprehensively and effectively measure the mutual influence between the multiple direct currents, and can comprehensively reflect the influence of the flexible direct currents on the short-circuit capacity of other nodes of the system, so that an effective analysis method is provided for planning the multiple direct current feed-in power grid, the accuracy and the rationality of the planning of the multiple direct current feed-in power grid can be effectively improved, and the running stability of the multiple direct current feed-in power grid is effectively improved.
EXAMPLE III
The multi-feed effective short-circuit ratio analysis terminal device of the third embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor, such as a multi-feed effective short ratio analysis program. The processor, when executing the computer program, implements the steps in each of the above-described embodiments of the multi-feed effective short ratio analysis method. Alternatively, the processor implements the functions of the modules/units in the above device embodiments when executing the computer program.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program in the multi-feed effective short-circuit ratio analysis terminal device.
The multi-feed effective short-circuit ratio analysis terminal device can be a desktop computer, a notebook computer, a palm computer, a cloud server and other computing devices. The multi-feed effective short-circuit ratio analysis terminal equipment can include, but is not limited to, a processor and a memory. It will be understood by those skilled in the art that the schematic diagram is merely an example of the multi-feed effective short ratio analysis terminal device, and does not constitute a limitation of the multi-feed effective short ratio analysis terminal device, and may include more or less components than those shown, or combine some components, or different components, for example, the multi-feed effective short ratio analysis terminal device may further include an input-output device, a network access device, a bus, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc., and the processor is a control center of the multi-feed effective short-circuit ratio analysis terminal device, and various interfaces and lines are used to connect various parts of the whole multi-feed effective short-circuit ratio analysis terminal device.
The memory can be used for storing the computer program and/or the module, and the processor realizes various functions of the multi-feed effective short-circuit ratio analysis terminal device by running or executing the computer program and/or the module stored in the memory and calling data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein, the multi-feed effective short-circuit ratio analysis terminal device integrated module/unit can be stored in a computer readable storage medium if it is realized in the form of software functional unit and sold or used as an independent product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (7)
1. A multi-feed effective short-circuit ratio analysis method, comprising:
determining the maximum reactive output quantity of the flexible direct current, and acquiring a voltage and current value of a conventional direct current drop point and a voltage and current value of the flexible direct current drop point;
calculating the lifting amount of the short circuit capacity of each conventional direct current drop point after the flexible direct current is accessed according to the flexible direct current maximum reactive output quantity, the conventional direct current drop point voltage current value and the flexible direct current drop point voltage current value;
calculating a multi-direct current feed-in interaction factor;
calculating a multi-feed-in effective short circuit ratio for calculating flexible direct current access according to the lifting amount and the multi-direct current feed-in interaction factor;
wherein, the calculating the promotion quantity of the short circuit capacity of each conventional direct current drop point after the flexible direct current is accessed according to the flexible direct current maximum reactive output quantity, the conventional direct current drop point voltage and current value and the flexible direct current drop point voltage and current value specifically comprises:
calculating the self-impedance of each conventional direct current drop point according to the voltage and current values of the conventional direct current drop points;
calculating the mutual impedance between each conventional direct current drop point and the flexible direct current drop point according to the voltage and current values of the conventional direct current drop points and the voltage and current values of the flexible direct current drop points;
calculating the lifting amount of the short circuit capacity of each conventional direct current drop point after the flexible direct current is accessed according to the maximum reactive output quantity of the flexible direct current, the self impedance of the conventional direct current drop point and the mutual impedance between each conventional direct current drop point and the flexible direct current drop point;
wherein, the calculating the boost of the short circuit capacity of each conventional dc drop point after the flexible dc access according to the maximum reactive output of the flexible dc, the self-impedance of the conventional dc drop point and the mutual impedance between each conventional dc drop point and the flexible dc drop point specifically includes:
the improvement amount of the short circuit capacity of each conventional direct current drop point after the flexible direct current is accessed is obtained by the following formula, and the specific formula is as follows:
wherein, Delta SijFor the lift amount, ZijIs the mutual impedance, Z, between the conventional DC drop point i and the flexible DC drop point jiiIs the self-impedance of the conventional DC drop point, QjmaxThe maximum reactive output of the flexible direct current drop point j.
2. The method for analyzing the effective short-circuit ratio of multi-feed according to claim 1, wherein the calculating the interaction factor of multi-feed direct current specifically comprises:
calculating the mutual impedance between each conventional direct current drop point and other conventional direct current drop points according to the voltage and current values of the conventional direct current drop points;
and calculating the multi-direct-current feed-in interaction factor according to the self impedance of each conventional direct-current drop point and the mutual impedance between each conventional direct-current drop point and other conventional direct-current drop points.
3. The method for analyzing the effective short-circuit ratio of multi-feed according to claim 2, wherein the calculating the effective short-circuit ratio of multi-feed considering the flexible dc access according to the boost amount and the interaction factor of multi-dc feed comprises:
acquiring the short-circuit capacity of a conventional direct current drop point when the flexible direct current access is not considered, and the reactive power of a filter and a parallel capacitor in a converter station at the conventional direct current drop point;
calculating the short circuit capacity of the conventional direct current drop point after the flexible direct current is accessed according to the short circuit capacity of the conventional direct current drop point when the flexible direct current is not considered, the reactive power and the lifting amount;
acquiring active power of any two conventional direct current lines and the total number of the conventional direct current lines;
and calculating the multi-feed-in effective short-circuit ratio of the flexible direct current access according to the active power of the conventional direct current line, the total number of the conventional direct current lines and the multi-direct current feed-in interaction factor.
4. The method for analyzing the effective short-circuit ratio of multi-feed according to claim 3, wherein the calculating the effective short-circuit ratio of multi-feed considering the flexible DC access according to the boost amount and the interaction factor of multi-DC feed further comprises:
the short circuit capacity of the conventional direct current drop point after the flexible direct current is accessed is obtained by the following formula, and the specific formula is as follows:
wherein, S'aciIs the short circuit capacity, S, at the conventional DC drop point after the flexible DC accessaciFor said short circuit capacity at a conventional dc drop point irrespective of flexible dc access;
the multi-feed-in effective short circuit ratio considering the flexible direct current access is obtained by the following formula, and the specific formula is as follows:
wherein, ISMIESCRiFor the multi-feed effective short-circuit ratio, P, taking into account the flexible DC accessdiActive power, P, of a conventional DC line idkIs the active power of a conventional DC line k, MIIFikFor the multi-DC feed interaction factor, N, between the conventional DC drop point i and the other conventional DC drop points kiIs the total number of the conventional direct current lines.
5. A multi-feed effective short ratio analysis apparatus, comprising:
the data acquisition module is used for determining the maximum reactive output quantity of the flexible direct current and acquiring the voltage and current values of the conventional direct current drop point and the flexible direct current drop point;
the lifting amount calculation module is used for calculating the lifting amount of the short circuit capacity of each conventional direct current falling point after the flexible direct current is accessed according to the flexible direct current maximum reactive output amount, the conventional direct current falling point voltage current value and the flexible direct current falling point voltage current value;
the interaction factor calculation module is used for calculating the multi-direct current feed-in interaction factors;
the multi-feed-in effective short-circuit ratio calculation module is used for calculating the multi-feed-in effective short-circuit ratio of the flexible direct current access according to the lifting amount and the multi-direct current feed-in interaction factors;
wherein, the calculating the promotion quantity of the short circuit capacity of each conventional direct current drop point after the flexible direct current is accessed according to the flexible direct current maximum reactive output quantity, the conventional direct current drop point voltage and current value and the flexible direct current drop point voltage and current value specifically comprises:
calculating the self-impedance of each conventional direct current drop point according to the voltage and current values of the conventional direct current drop points;
calculating the mutual impedance between each conventional direct current drop point and the flexible direct current drop point according to the voltage and current values of the conventional direct current drop points and the voltage and current values of the flexible direct current drop points;
calculating the lifting amount of the short circuit capacity of each conventional direct current drop point after the flexible direct current is accessed according to the maximum reactive output quantity of the flexible direct current, the self impedance of the conventional direct current drop point and the mutual impedance between each conventional direct current drop point and the flexible direct current drop point;
wherein, the calculating the boost of the short circuit capacity of each conventional dc drop point after the flexible dc access according to the maximum reactive output of the flexible dc, the self-impedance of the conventional dc drop point and the mutual impedance between each conventional dc drop point and the flexible dc drop point specifically includes:
the improvement amount of the short circuit capacity of each conventional direct current drop point after the flexible direct current is accessed is obtained by the following formula, and the specific formula is as follows:
wherein, Delta SijFor the lift amount, ZijIs the mutual impedance, Z, between the conventional DC drop point i and the flexible DC drop point jiiIs the self-impedance of the conventional DC drop point, QjmaxThe maximum reactive output of the flexible direct current drop point j.
6. A multi-feed effective short-circuit ratio analysis terminal device comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the multi-feed effective short-circuit ratio analysis method according to any one of claims 1 to 4 when executing the computer program.
7. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the method for multi-feed effective short ratio analysis according to any one of claims 1 to 4.
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