CN111193292B - Site selection and volume fixing method for distributed power supply - Google Patents

Site selection and volume fixing method for distributed power supply Download PDF

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CN111193292B
CN111193292B CN201911389259.9A CN201911389259A CN111193292B CN 111193292 B CN111193292 B CN 111193292B CN 201911389259 A CN201911389259 A CN 201911389259A CN 111193292 B CN111193292 B CN 111193292B
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protection
power supply
distributed power
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CN111193292A (en
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孙峰
李胜辉
王刚
张强
迟成
曾辉
袁鹏
李欣蔚
王超
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd
Shenyang Institute of Engineering
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd
Shenyang Institute of Engineering
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

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  • Power Engineering (AREA)
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Abstract

The invention belongs to the technical field of power grid operation safety, and particularly relates to a distributed power supply location and volume fixing method. The invention comprises the following steps: inputting system parameters; initializing optimization algorithm parameters; randomly generating particles representing the installation position and capacity of the distributed power supply, and initializing the initial speed of each particle; forming a basic admittance, and performing load flow calculation by adopting a rapid load flow method; completing harmonic power flow calculation; completing protection coordination calculation; calculating the fitness of each particle, and updating global optimal particles and individual optimal particles; judging whether the iteration number requirement is met; and determining the installation position and the capacity of the distributed power supply according to the global optimal particles. The invention can effectively optimize the electric energy quality of the system after the distributed power supply is accessed, reduce the negative influence of the distributed power supply on the original power distribution network protection configuration and optimize the access capacity of the distributed power supply.

Description

Site selection and volume fixing method for distributed power supply
Technical Field
The invention belongs to the technical field of power grid operation safety, and particularly relates to a distributed power supply location and volume fixing method.
Background
When planning the access of the power distribution network to the distributed power supply, the requirements of voltage constraint, line capacity, reliability index and the like need to be considered, the investment requirement and economic and environmental benefits of the distributed power supply are combined, an optimization function is established, and the installation position and the access capacity of the distributed power supply are determined. The distributed power supply is connected into the distribution network, so that the tide distribution is changed, the fault current is drawn or increased, the original protection device cannot be used, and the new setting is needed. Photovoltaic, fan, energy storage etc. are joined in marriage the net through the dc-to-ac converter access, and a large amount of power electronic equipment bring the harmonic problem, cause harmonic distortion, influence some to the higher user production life of electric energy quality requirement. The existing locating and sizing method does not fully consider the problems of harmonic influence and protection coordination, so that the planning scheme cannot meet the requirement of the electric energy quality in a distribution network, normal actions of protection are influenced, and great safety risks are caused.
Disclosure of Invention
The invention provides a distributed power supply location and volume fixing method aiming at the problems in the prior art, and aims to comprehensively consider the harmonic influence and the protection setting after the distributed power supply is accessed, formulate a corresponding punishment factor as an example adaptive value and optimize the access position and the access capacity of the distributed power supply.
Based on the above purpose, the invention is realized by the following technical scheme:
a distributed power supply site selection and volume fixing method comprises the following steps:
step 1: inputting system parameters;
step 2: initializing optimization algorithm parameters;
and step 3: randomly generating particles representing the installation position and capacity of the distributed power supply, and initializing the initial speed of each particle;
and 4, step 4: forming a basic admittance, and performing load flow calculation by adopting a rapid load flow method;
and 5: completing harmonic power flow calculation;
step 6: completing protection coordination calculation;
and 7: calculating the fitness of each particle, and updating the global optimal particle and the individual optimal particle;
and 8: judging whether the iteration frequency requirement is met; if yes, go to step 9; if not, entering step 4 until the requirements are met;
and step 9: and determining the installation position and the capacity of the distributed power supply according to the global optimal particles.
Further, the parameters in step 1 include: bus data, branch data and distributed generator mountable position, distributed generator harmonic.
Further, the parameters in step 2 include a cognitive coefficient, a social coefficient, a maximum and minimum inertial weight value, and a maximum iteration number, and the set iteration number k =1.
The method for completing the harmonic power flow calculation comprises the following steps:
(1) Reading a load flow calculation result, system data, the type, the position and the capacity of the distributed power supply;
(2) H-order impedance of load, line, synchronous motor and capacitor is calculated to construct harmonic impedance matrix Y h ；
(3) Calculating harmonic injection current of distributed voltage power supply and constructing harmonic current matrix I h ；
(4) Calculating a harmonic voltage matrix according to the harmonic impedance matrix and the harmonic current matrix;
(5) Completing the calculation of all H-th harmonic voltages;
(6) And calculating a harmonic voltage distortion penalty factor and a harmonic voltage mean penalty factor.
The h-order impedance of the load, the line, the synchronous motor and the capacitor is calculated to construct a harmonic impedance matrix Y h The method comprises the following steps:
Figure BDA0002344481750000021
Figure BDA0002344481750000022
Figure BDA0002344481750000023
in the above formula: p d,i Representing the active load demand, Q, of bus i d,i Representing the reactive load demand of the bus i;
Figure BDA0002344481750000024
representing the voltage fundamental wave amplitude of the bus i; />
Figure BDA0002344481750000025
Representing the impedance of the load on the bus i under the h harmonic; />
Figure BDA0002344481750000026
Represents the fundamental impedance of the capacitor on the bus i; />
Figure BDA0002344481750000027
Represents the h harmonic impedance; />
Figure BDA0002344481750000028
Representing the h harmonic impedance, R, of the branch i,i+1 And X i,i+1 J has no specific meaning for branch fundamental wave resistance and reactance, and represents imaginary part of imaginary number, and h represents harmonic frequency.
Calculating harmonic injection current of the distributed voltage power supply and constructing a harmonic current matrix I h The method comprises the following steps:
Figure BDA0002344481750000031
in the above formula:
Figure BDA0002344481750000032
represents the h harmonic current; c (h) represents the h harmonic current proportion; p is dg,i And Q dg,i The active and reactive outputs of the bus I-out distributed power supply are represented; />
Figure BDA0002344481750000033
Representing the magnitude of the fundamental voltage wave on bus i.
The harmonic voltage matrix is calculated according to the harmonic impedance matrix and the harmonic current matrix, and the following formula is shown:
V h ＝Y h I h ；
wherein: y is h Representing the h-harmonic impedance matrix, I h Representing the h-harmonic current matrix.
The harmonic voltage distortion penalty factor B and the harmonic voltage mean penalty factor A are calculated as follows:
Figure BDA0002344481750000034
Figure BDA0002344481750000035
in the above formula: v. of max Represents a voltage maximum; THD max Represents the maximum value of harmonic voltage distortion; v. of i h Representing i-node h-harmonic voltage, v i 1 Represents the i-node fundamental voltage; h represents the harmonic highest order, and B represents the harmonic voltage distortion penalty factor.
The completing the protection coordination calculation comprises:
(1) Reading a power flow result, system data, the type, the position and the capacity of the distributed power supply;
(2) Forming a bus impedance matrix Zbus;
(3) Calculating three-phase short-circuit current flowing through protection;
(4) Initializing a setting coefficient and a starting current of each protection, and calculating protection action time;
(5) Optimizing a protection setting coefficient and a starting current by using a gradient descent method, and minimizing main protection and backup protection;
(6) Outputting all protection and fault positions and outputting fault action time and TDS;
(7) And calculating a protection penalty factor.
Initializing a setting coefficient and a starting current of each protection, and calculating protection action time as follows:
Figure BDA0002344481750000041
in the above formula: t is t i,j To protect the action time; i is p,i Starting current for protecting i; i is sc,ij Short circuit current leading to protection i for fault j; TDS i Representing a setting coefficient; a and b are constants;
the method optimizes the protection setting coefficient and the starting current by using a gradient descent method, and minimizes main protection and backup protection as follows:
Figure BDA0002344481750000042
Figure BDA0002344481750000043
in the above formula: t is t p i,j 、t b i,j Respectively representing the action time of main protection and backup protection, and N representing the protection number; m represents the number of failures, t b i,j Indicating the time of operation of the backup protection, t p i,j Indicating the time of action of the main protection, t max i,j Denotes the maximum protection action time, I min p,i To representProtection I starting current minimum limit, I max p,i Indicating the maximum limit of the starting current, TDS, of protection i min Indicating the minimum limit of the setting coefficient, TDS i Indicating setting coefficient, TDS max Representing the maximum limit value of the setting coefficient;
the protection penalty factor is calculated as follows;
C＝(t p i,j +t b i,j )-CTL
in the above formula: CTL denotes the guard interval, t p i,j Indicating the time of action of the main protection, t b i,j Indicating the time of the backup protection action.
The invention has the following advantages and beneficial effects:
the method considers the harmonic influence after the distributed power supply is accessed, and adopts harmonic voltage distortion and a harmonic voltage mean value as penalty factors, so that the electric energy quality of a system after the distributed power supply is accessed can be effectively optimized.
According to the method, the protection setting coefficient and the starting current are optimized by adopting a gradient descent method, and the main protection starting current, the backup protection starting current and the protection interval form a protection penalty factor, so that the negative influence of a distributed power supply on the original power distribution network protection configuration can be reduced, and the access capacity of the distributed power supply is optimized.
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The invention will be described in further detail with reference to the drawings and specific embodiments for facilitating understanding and practicing of the invention by those of ordinary skill in the art, but it should be understood that the scope of the invention is not limited by the specific embodiments.
FIG. 1 is a schematic flow diagram of the process of the present invention.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. Other embodiments, which can be derived by one of ordinary skill in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in FIG. 1, FIG. 1 is a schematic flow chart of the method of the present invention. The invention relates to a distributed power supply site selection and volume fixing method, which comprises the following steps:
step 1: inputting system parameters, the parameters including: bus data, branch data and the mountable position of the distributed power supply, and harmonic waves of the distributed power supply;
step 2: initializing optimization algorithm parameters, wherein the parameters comprise a cognitive coefficient, a social coefficient, a maximum and minimum inertia weight value and a maximum iteration number, and setting the iteration number k =1;
and step 3: randomly generating particles representing the installation position and capacity of the distributed power supply, and initializing the initial speed of each particle;
and 4, step 4: forming a basic admittance, and performing load flow calculation by adopting a rapid load flow method;
and 5: completing harmonic power flow calculation;
5.1, reading a load flow calculation result, system data, the type, the position and the capacity of the distributed power supply;
5.2 calculating h-order impedance of load, line, synchronous motor and capacitor to construct harmonic impedance matrix Y h ；
Figure BDA0002344481750000051
Figure BDA0002344481750000052
Figure BDA0002344481750000061
In the above formula: p is d,i Representing the active load demand, Q, of bus i d,i Representing the reactive load demand of the bus i;
Figure BDA0002344481750000062
representing a busbar iVoltage fundamental amplitude; />
Figure BDA0002344481750000063
Representing the impedance of the load on the bus i under the h harmonic; />
Figure BDA0002344481750000064
Represents the fundamental impedance of the capacitor on the bus i; />
Figure BDA0002344481750000065
Represents the h harmonic impedance; />
Figure BDA0002344481750000066
Representing the h harmonic impedance, R, of the branch i,i+1 And X i,i+1 J has no specific meaning for branch fundamental wave resistance and reactance, and represents imaginary part of imaginary number, and h represents harmonic frequency.
5.3 calculating harmonic injection current of the distributed voltage power supply and constructing a harmonic current matrix I h ；
Figure BDA0002344481750000067
In the above formula:
Figure BDA0002344481750000068
represents the h harmonic current; c (h) represents the h harmonic current proportion; p dg,i And Q dg,i The active and reactive outputs of the bus I-out distributed power supply are represented; />
Figure BDA0002344481750000069
Representing the voltage fundamental wave amplitude of the bus i;
5.4 calculating the harmonic voltage matrix V from the harmonic impedance matrix and the harmonic current matrix h ＝Y h I h ；
Wherein: y is h Representing the h-harmonic impedance matrix, I h Representing an h-harmonic current matrix;
5.5, completing the calculation of all H-th harmonic voltages;
5.6 calculating a harmonic voltage distortion penalty factor B and a harmonic voltage mean penalty factor A;
Figure BDA00023444817500000610
Figure BDA00023444817500000611
in the above formula: v. of max Represents a voltage maximum; THD max Represents the maximum value of harmonic voltage distortion; v. of i h Representing i-node h-harmonic voltage, v i 1 Represents the i-node fundamental voltage; h represents the harmonic highest order, and B represents the harmonic voltage distortion penalty factor.
Step 6: completing protection coordination calculation;
6.1 reading a power flow result, system data, the type, the position and the capacity of the distributed power supply;
6.2, forming a bus impedance matrix Zbus;
6.3 calculating the three-phase short-circuit current flowing through the protection;
6.4 initializing the setting coefficient and the starting current of each protection, and calculating the protection action time.
Figure BDA0002344481750000071
In the above formula: t is t i,j To protect the action time; i is p,i Starting current for protecting i; i is sc,ij Short circuit current leading to protection i for fault j; TDS i Representing a setting coefficient; a and b are constants;
6.5 optimizing the protection setting coefficient and the starting current by using a gradient descent method, and minimizing main protection and backup protection;
Figure BDA0002344481750000072
Figure BDA0002344481750000073
in the above formula: t is t p i,j 、t b i,j Respectively representing the action time of main protection and backup protection, and N representing the protection number; m denotes the number of faults, t b i,j Indicating the time of operation of the backup protection, t p i,j Indicating the time of action of the main protection, t max i,j Denotes the maximum protection action time, I min p,i Represents the minimum limit of the starting current of the protection I, I max p,i Indicating the maximum limit of the starting current, TDS, of protection i min Indicating the minimum limit of the setting coefficient, TDS i Indicating setting coefficient, TDS max And representing the maximum limit value of the setting coefficient.
6.6 outputting all protection and fault positions to output fault action time and TDS;
6.7 calculating a protection penalty factor C;
C＝(t p i,j +t b i,j )-CTL
in the above formula: CTL denotes the guard interval, t p i,j Indicating the time of action of the main protection, t b i,j Indicating the time of the backup protection action.
And 7: calculating the fitness of each particle, and updating global optimal particles and individual optimal particles;
and 8: judging whether the iteration number requirement is met; if yes, entering step 9; if not, entering the step 4 until the requirements are met;
and step 9: and determining the installation position and the capacity of the distributed power supply according to the global optimal particles.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (7)

1. A distributed power supply site selection and volume fixing method comprises the following steps: inputting system parameters; step 2: initializing optimization algorithm parameters including a cognitive coefficient, a social coefficient, a maximum and minimum inertia weight value and a maximum iteration number, and setting the iteration number k =1; and step 3: randomly generating particles representing the installation position and the capacity of the distributed power supply, and initializing the initial speed of each particle; and 4, step 4: forming a basic admittance, and completing load flow calculation by adopting a rapid load flow method; and 5: completing harmonic power flow calculation; step 6: completing protection coordination calculation; and 7: calculating the fitness of each particle, and updating global optimal particles and individual optimal particles; and step 8: judging whether the iteration number requirement is met; if yes, entering step 9; if not, entering the step 4 until the requirements are met; and step 9: determining the installation position and the capacity of the distributed power supply according to the global optimal particles; the method is characterized in that: the completing the harmonic power flow calculation comprises the following steps: (1) Reading a load flow calculation result, system data, the type, the position and the capacity of the distributed power supply; (2) H-order impedance of load, line, synchronous motor and capacitor is calculated to construct harmonic impedance matrix Y h (ii) a (3) Calculating harmonic injection current of the distributed power supply and constructing a harmonic current matrix I h (ii) a (4) Calculating a harmonic voltage matrix according to the harmonic impedance matrix and the harmonic current matrix; (5) completing the calculation of all H subharmonic voltages; (6) And calculating a harmonic voltage distortion penalty factor and a harmonic voltage mean penalty factor.
2. The distributed power supply site selection and volume fixing method according to claim 1The method is characterized in that: the h-order impedance of the load, the line, the synchronous motor and the capacitor is calculated to construct a harmonic impedance matrix Y h The method comprises the following steps:
Figure FDA0004047076960000011
Figure FDA0004047076960000012
Figure FDA0004047076960000013
in the above formula: p d,i Representing the active load demand, Q, of bus i d,i Representing the reactive load demand of the bus i;
Figure FDA0004047076960000014
represents the fundamental voltage of the bus i;
Figure FDA0004047076960000015
representing the impedance of the load on the bus i under the h harmonic;
Figure FDA0004047076960000016
represents the fundamental impedance of the capacitor on the bus i;
Figure FDA0004047076960000017
represents the h-order harmonic impedance;
Figure FDA0004047076960000018
representing the h harmonic impedance, R, of the branch i,i+1 And X i,i+1 J has no specific meaning for branch fundamental wave resistance and reactance, and represents imaginary part of imaginary number, and h represents harmonic frequency.
3. According to claim1, the location and volume fixing method for the distributed power supply is characterized by comprising the following steps: calculating harmonic injection current of the distributed power supply and constructing a harmonic current matrix I h The method comprises the following steps:
Figure FDA0004047076960000019
in the above formula:
Figure FDA0004047076960000021
represents the h harmonic current; c (h) represents the h harmonic current proportion; p dg,i And Q dg,i Representing the active and reactive outputs of the distributed power supply at the bus i;
Figure FDA0004047076960000022
representing the fundamental voltage of bus i.
4. The distributed power supply siting and sizing method according to claim 1, wherein: the harmonic voltage matrix is calculated according to the harmonic impedance matrix and the harmonic current matrix, and the following formula is shown:
V h ＝Y h I h ；
wherein: y is h Representing a harmonic impedance matrix, I h Representing a harmonic current matrix.
5. The distributed power supply siting and sizing method according to claim 1, wherein: the harmonic voltage distortion penalty factor and the harmonic voltage mean penalty factor are calculated as follows:
Figure FDA0004047076960000023
Figure FDA0004047076960000024
in the above formula: v. of max Represents a voltage maximum; THD max Represents the maximum value of harmonic voltage distortion; v i h Representing the h harmonic voltage, v, of the bus i i 1 Represents the fundamental voltage of the bus i; h represents the harmonic highest frequency, B represents a harmonic voltage distortion penalty factor, and A represents a harmonic voltage mean penalty factor.
6. The distributed power supply siting and sizing method according to claim 1, characterized in that: the completing the protection coordination calculation comprises:
(1) Reading a power flow result, system data, the type, the position and the capacity of the distributed power supply;
(2) Forming a bus impedance matrix Zbus;
(3) Calculating three-phase short-circuit current flowing through protection;
(4) Initializing a setting coefficient and a starting current of each protection, and calculating protection action time;
(5) Optimizing a protection setting coefficient and a starting current by using a gradient descent method, and minimizing main protection and backup protection;
(6) Outputting all protection and fault positions to output fault action time and setting coefficients;
(7) And calculating a protection penalty factor.
7. The distributed power supply siting and sizing method according to claim 6, wherein: initializing a setting coefficient and a starting current of each protection, and calculating protection action time as follows:
Figure FDA0004047076960000031
in the above formula: t is t i,j To protect the action time; i is p,i Starting current for protecting i; i is sc,ij Short circuit current leading to protection i for fault j; TDS i Representing a setting coefficient; a and b are constants;
the method optimizes the protection setting coefficient and the starting current by using a gradient descent method, and minimizes main protection and backup protection as follows:
Figure FDA0004047076960000032
Figure FDA0004047076960000033
in the above formula: t is t p i,j 、t b i,j Respectively representing the action time of main protection and backup protection, and N representing the protection number; m represents the number of failures, t b i,j Indicating the time of operation of the backup protection, t p i,j Indicating the time of action of the main protection, t max i,j Denotes the maximum protection action time, I min p,i Represents the minimum limit of the starting current of the protection I, I max p,i Indicating the maximum limit of the starting current, TDS, of protection i min Indicating the minimum limit of the setting coefficient, TDS i Indicating setting coefficient, TDS max Representing the maximum limit value of the setting coefficient;
the protection penalty factor is calculated as follows;
C＝(t p i,j +t b i,j )-CTL
in the above formula: CTL denotes the guard interval, t p i,j Indicating the time of action of the main protection, t b i,j Indicating the time of the backup protection action.
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JP2015219189A (en) * 2014-05-20 2015-12-07 一般財団法人電力中央研究所 Harmonic wave estimation device, harmonic wave estimation method and harmonic wave estimation program
CN105552965A (en) * 2016-02-18 2016-05-04 中国电力科学研究院 Chance constraint planning based optimal configuration method of distributed energy source
CN105809265A (en) * 2014-12-29 2016-07-27 国家电网公司 Capacity configuration method of power distribution network flexible interconnection device comprising distributed renewable energy sources

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015219189A (en) * 2014-05-20 2015-12-07 一般財団法人電力中央研究所 Harmonic wave estimation device, harmonic wave estimation method and harmonic wave estimation program
CN105809265A (en) * 2014-12-29 2016-07-27 国家电网公司 Capacity configuration method of power distribution network flexible interconnection device comprising distributed renewable energy sources
CN104659816A (en) * 2015-03-13 2015-05-27 贵州电力试验研究院 Improved particle swarm algorithm-based optimized configuration method of distributed electrical connection power distribution system
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