CN112994102A - Voltage calculation optimization method for power distribution network feeder line access distributed power supply - Google Patents
Voltage calculation optimization method for power distribution network feeder line access distributed power supply Download PDFInfo
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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
- H02J3/381—Dispersed generators
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
Abstract
The invention provides a voltage calculation optimization method for a power distribution network feeder line to access a distributed power supply, which comprises the following steps: firstly, according to the loading amount and the loading position of the distributed power supplies, all the distributed power supplies of a power distribution network feeder line are equivalent to a plurality of rigid PQ users with random access and unequal power; calculating the power of any two users on the feeder line by combining the user access position and the user load; and (4) calculating a voltage value along the feeder line by combining the voltage of the high-voltage side of the feeder line transformer, the parameters of the feeder line and the like. And finally, optimizing the access positions, capacity and quantity of the distributed power supplies according to the related requirements of power distribution network voltage management by taking the maximum value and the minimum value of the line voltage as targets of out-of-limit prevention. The invention develops the optimal design of the access quantity, capacity and access point of the distributed power supply aiming at the power distribution network feeder line which is planned to be accessed to the distributed power supply, and has important significance for preventing and treating the problem of out-of-limit voltage of the power distribution network node and improving the power quality of a user.
Description
Technical Field
The invention relates to power distribution network distributed power supply access planning of a power system, in particular to a voltage calculation optimization method for a power distribution network feeder line to access a distributed power supply.
Background
In response to national demands for improving the utilization efficiency of electric energy, reducing the utilization of fossil fuels, reducing the emission of waste water and waste gas, increasing the proportion of clean electric power, and reducing the loss of long-distance transmission, the application of power distribution networks including distributed power generation has become the trend of current research. However, as the capacity of the distributed power supply in the power distribution network is increased, the voltage distribution characteristics of the power distribution network are directly affected, and the problem that the node voltage of the power distribution network is higher/lower in limit can be caused.
In regions with backward economic level and poor power grid management in China, the power grids mostly adopt a radial structure, the automation level of equipment is not high, and the accurate regulation and control of the voltage of the power distribution network are difficult; but the planning of distributed power supply access is carried out at the initial stage of the power distribution network construction, so that the prevention and treatment of the power distribution network voltage problem can be greatly improved, and the secondary investment cost of power distribution network voltage management can be reduced. Therefore, when the distribution network feeder is planned to be accessed to the distributed power supply, the optimization design of the access quantity, capacity and access points of the distributed power supply is developed, and the control and adjustment of the voltage of the distribution network are significant.
Therefore, the invention provides a voltage calculation optimization method for a power distribution network feeder line to access a distributed power supply, aiming at planning the power distribution network feeder line to access the distributed power supply, aiming at preventing the maximum value and the minimum value of the power distribution network feeder line voltage from exceeding the upper limit/the lower limit, and developing the optimization design of the access quantity, the access capacity and the access point of the distributed power supply, and the method has important significance for preventing and treating the problem of out-of-limit of the node voltage of the power distribution network and improving the power quality of users.
Disclosure of Invention
In view of the above, the invention provides a voltage calculation optimization method for a distribution network feeder line to access a distributed power supply, which aims at planning the distribution network feeder line to access the distributed power supply, aims at preventing the maximum value and the minimum value of the voltage of the distribution network feeder line from exceeding the upper limit/the lower limit, develops the optimization design of the access quantity, the access capacity and the access point of the distributed power supply, and has important significance for preventing and treating the problem of out-of-limit voltage of a distribution network node and improving the power quality of a user.
The invention is realized by adopting the following technical scheme:
a voltage calculation optimization method for a power distribution network feeder line to access a distributed power supply comprises the following steps:
(1) firstly, according to the loading amount and the loading position of the distributed power supplies, all the distributed power supplies of a power distribution network feeder line are equivalent to a plurality of rigid PQ users with random access and unequal power;
(2) according to the feeder line model after the equivalence in the step (1), combining the user access position and the user load, and after the user load is equivalent to a PQ load node, calculating the power between any two users on the feeder line;
(3) according to the step (2) inter-user powerThe calculation result is combined with the high-voltage side voltage U of the feeder line transformer0A feeder parameter Rn、XnCalculating the voltage value U along the feeder linen；
(4) According to the related requirements of power distribution network voltage management, the voltage values of all nodes along the line can be obtained according to the voltage along the feeder line solved in the step (3), the maximum value and the minimum value of the line voltage are prevented from exceeding the limit, and the access position and the capacity of the distributed power supply are optimized.
Further, the value of P in the rigid PQ user is-PV，PVFor its installed capacity, Q is taken to be 0.
Further, the step (2) specifically comprises:
assuming that the total number of subscribers on the feeder is N, the load of any subscriber N is represented as PLn+jQLn＝Pn+jQn-PVn(n＝1,2,...,N)，
Wherein P isnIs the active load, Q, of any user nnIs the reactive load of any user n, PVnIs the active power output, P, of the distributed power supply of any user nn、Qn0 then there is no actual load, PVn0 then there is no distributed power access, Pn、QnAnd PVnIf the load is not 0, the load and the distributed power supply are accessed;
for any user N (1. ltoreq. N. ltoreq. N-1) and the power between the user N-1, there are:
further, the step (3) specifically comprises:
suppose that the line impedance between the (n-1) th subscriber and the nth subscriber is Rn+jXn＝ln(r + jx) where lnThe feeder length between the (n-1) th user and the nth user is defined, r + jx is a unit length parameter of the feeder, and the voltage drop between the (n) th user and the (n-1) th user is defined as:
the voltage of the low-voltage side of the transformer of the power distribution network feeder line is assumed to be U0The voltage U of the nth user on the linenComprises the following steps:
because r > x in the power distribution network, the above formula is simplified as follows:
the pressure drop between the nth and the (n-1) th users is:
if it is
Can push out Un＜Un-1When the sum of active power of all loads backward from the nth user point and the (n-1) th user point is larger than the sum of power generation power of all power supplies, the voltage is reduced; if it is
Can push out Un＞Un-1When the sum of active power of all loads backward from the nth user point and the (n-1) th user point is smaller than the sum of generated power of all power supplies, the voltage rises.
Further, the step (4) specifically comprises:
step (3) obtaining the voltage value U of each node along the feeder linenRear taking UnThe maximum value and the minimum value of the voltage are compared with the maximum point of the line voltage of the low-voltage distribution network not exceeding 1.07pu and the minimum point not exceeding 0.93p according to the requirement of power quality supply voltage deviation (GB/T12325-2008), and if the maximum value and the minimum value of the voltage do not meet the requirement, the maximum value and the minimum value of the voltage are not less than 0.93pThe optimization is carried out according to the following process:
the number of the feeder lines connected to the distributed power supplies is p (p is more than or equal to 1 and less than or equal to N), and a vector Y describing the connection positions of the feeder lines is [ N ]1,n2,....,nN]Where 0 denotes no power access, 1 denotes power access, and the vector P describing its access capacity is PV1,PV2,....,PVN]0 represents no power access, and non-0 represents power access capacity;
if the highest value maxU of the line voltagenMore than 1.07pu, or minimum line voltage minUnIf the input voltage is less than 0.93pu, optimizing the position and the capacity of the distributed power supply on the feeder line;
in the optimization process, an upper limit value k of the optimization times is setmaxAnd an optimization order variable k: k is given as an initial value 1, k is equal to k +1 when the power supply access position and capacity are optimized once, and k is more than or equal to kmaxAnd stopping optimization and reselecting the power supply access quantity.
The invention has the following beneficial effects:
1. in order to simplify the transient stability characteristic of the power supply with negligible calculation difficulty, all distributed power supplies are equivalent to a plurality of rigid PQ users with random access and unequal power, so that the calculation difficulty is reduced, and the calculation requirement of the voltage characteristic of a feeder line can be met;
2. according to the method, the resistance of the power distribution network is ignored when the voltage of the node along the feeder line is calculated, the calculation efficiency is improved, meanwhile, a certain calculation precision is guaranteed, and the conclusion that the voltage rising efficiency along the feeder line is obvious when the distributed power supply is concentrated at the tail end of the feeder line is deduced;
3. when the distributed power supply access position and capacity are optimized, optimization of adjusting the distributed power supply access position is considered firstly, optimization of adjusting the distributed power supply access capacity is considered later, and optimization cost can be reduced as much as possible while voltage is adjusted;
4. when the access position and the access position of the distributed power supply are optimized, if the feeder line voltage extreme value cannot be out of limit by adjusting the access position and the access position of the distributed power supply for a plurality of times, the access position and the access position of the distributed power supply are optimized again after increasing the access number of the distributed power supply, and although the investment cost is increased possibly, the feeder line voltage extreme value can be ensured to meet the requirement of no out of limit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a feeder line for a power distribution grid with random access to distributed power and loads in accordance with the present invention;
FIG. 2 is a flow chart of access capacity, access location optimization for a distributed power supply of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
As shown in fig. 1, an embodiment of the present invention provides a voltage calculation optimization method for a distribution network feeder to access a distributed power supply, including the following steps:
(1) firstly, according to the loading amount and the loading position of the distributed power supplies, all the distributed power supplies of a power distribution network feeder line are equivalent to a plurality of rigid PQ users with random access and unequal power;
generally, during the planning period of the feeder line of the distribution network accessing the distributed power supply, only the steady state process is considered, and the distributed power supply can be regarded as a rigid PQ user, wherein the value of P is-PV(PVFor which installed capacity is generated), and Q generally takes 0.
(2) According to the feeder line model after the equivalence in the step (1), combining the user access position and the user load, and after the user load is equivalent to a PQ load node, calculating the power between any two adjacent users on the feeder line;
as shown in fig. 1, a feeder of a power distribution network with random access to distributed power sources and loads is shown, assuming that the total number of users on the feeder is N (considering users and distributed power access points), the load of any user N is represented as PLn+jQLn＝Pn+jQn-PVn(n＝1,2,...,N)：
Wherein P isnIs the active load, Q, of any user nnIs the reactive load of any user n, PVnIs the active power output, P, of the distributed power supply of any user nn、Qn0 then there is no actual load, PVn0 then there is no distributed power access, Pn、QnAnd PVnIf the value is not 0, the load and the distributed power supply are accessed.
For any user N (1. ltoreq. N. ltoreq. N-1) and the power between the user N-1, there are:
(3) according to the power calculation result between users in the step (2), combining the voltage of the low-voltage side as U0A feeder parameter Rn、XnThe voltage value along the feeder line is obtained;
a feeder line for a power distribution network with random access to distributed power and loads, as shown in FIG. 1, is assumed to be a line between an n-1 st subscriber and an nth subscriberPath impedance of Rn+jXn＝ln(r + jx) where lnThe feeder length between the (n-1) th user and the nth user is defined, r + jx is a unit length parameter of the feeder, and the voltage drop between the (n) th user and the (n-1) th user is defined as:
the voltage of the low-voltage side of the transformer of the power distribution network feeder line is assumed to be U0The voltage U of the nth user on the linenComprises the following steps:
because r > x in the power distribution network, the above formula can be simplified as follows:
solving U when N is 1-NnAnd then the voltage distribution along the feeder line is solved.
The pressure drop between the nth and the (n-1) th users is
If it is
Can push out Un＜Un-1When the sum of active power of all loads backward from the nth user point and the (n-1) th user point is larger than the sum of power generation power of all power supplies, the voltage is reduced; if it is
Can push out Un＞Un-1That is, the sum of active power of all loads backward from the nth user point and the nth-1 user point is less than the generated power of all power suppliesWhen this is done, the voltage rises. It can be seen that the effect of the increase in the line voltage along the feed line is significant when the distributed power is concentrated at the end of the feed line.
(4) According to the related requirements of power distribution network voltage management, the voltage values of all nodes along the line can be obtained according to the voltage along the feeder line solved in the step (3), the maximum value and the minimum value of the line voltage are prevented from exceeding the limit, and the access position and the capacity of the distributed power supply are optimized.
According to the requirements of power quality supply voltage deviation (GB/T12325-2008), the highest point of the voltage along the line of the low-voltage distribution network does not exceed 1.07pu, and the lowest point is not lower than 0.93 pu.
The number of the feeder lines connected to the distributed power supplies is p (p is more than or equal to 1 and less than or equal to N), and a vector Y describing the connection positions of the feeder lines is [ N ]1,n2,....,nN](0 means no power access, 1 means power access), and a vector P ═ P describing its access capacityV1,PV2,....,PVN](0 means no power access, non-0 means power access capacity). Considering that the cost of installing the distributed power generation equipment is high, the power supply access position and capacity are preferentially changed to meet the regulation requirement as much as possible under the condition of not increasing the number of the equipment.
If the highest value maxU of the line voltagenMore than 1.07pu, or minimum line voltage minUnIf the power is less than 0.93pu, the distributed power supply on the feeder line carries out the optimization process like the flow of the figure 2.
In the optimization process, due to the fact that the planned power supply access number is too small, the maxU is difficult to meet after multiple times of optimizationn＜1.07pu&minUnIs greater than 0.93pu, therefore, an upper limit value k of the optimization times is set in the optimization processmaxAnd an optimization order variable k: k is given as an initial value 1, k is equal to k +1 when the power supply access position and capacity are optimized once, and k is more than or equal to kxamThe optimization should be stopped and the total capacity and the total amount of power access should be selected again.
When the total capacity and the total quantity of the power access are selected again, if maxUnIf the number of the users is more than 1.07pu, 1 distributed power supply is added to one bit after all the users accessing the distributed power supplyThe power supply is connected, the total capacity is reduced by 10-20%, and the optimization process is switched again; if minUnIf the number of the distributed power sources is less than 0.93pu, 1 distributed power source is added to the previous position of all users connected with the distributed power sources, the total connected capacity is increased by 10% -20%, and the optimization process is switched again.
By taking a certain power distribution network feeder line of a single distributed power supply grid-connected mode as an example, the method is applied to the calculation and optimization of the power distribution network feeder line access distributed power supply and the load voltage so as to avoid the upper limit/lower limit specified by a power distribution network voltage extreme value crossing rule, and has important significance for preventing and treating the problem of power distribution network node voltage crossing and improving the power quality of users.
The reference voltage grade of a feeder line is assumed to be 380V, the low-voltage side of a transformer at the head end of the feeder line is 380V, and the type of the feeder line is typical LGJ-25 mm in a power distribution network2(1.131+ j0.393 omega/km), and 8 users are connected to the feeder line, each user load is 0.001MW, the distance between adjacent users is 0.04km, and the power supply of the users with 0.08MW is planned to be connected at the position of the number 8 user.
Firstly, implementing the step (1), and according to the loading amount and the loading position of the distributed power supplies, equating all the distributed power supplies of the power distribution network feeder line into a plurality of rigid PQ users with random access and unequal power; then, the step (2) is carried out, and the power of any two users on the feeder line is calculated by combining the load amount and the position of the users; then, combining the voltage of the high-voltage side of the feeder transformer, the parameters of the feeder and the like, and solving the voltage value along the feeder; and finally, according to the figure 2, implementing the step (4), and optimizing the access position and capacity k of the distributed power supply by taking the maximum value and the minimum value of the line voltage as targets of preventing the line voltage from exceeding the limit according to the related requirements of the voltage management of the power distribution networkmax＝10。
When a 0.06MW distributed power supply is connected to the 8 # subscriber, the voltages of the 8 subscribers on the feeder are shown in table 1 below.
TABLE 1 feeder voltage distribution (unit: kV) when a 0.06MW distributed power supply is connected to subscriber number 8
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Value of voltage | 386.19 | 392.40 | 398.63 | 404.87 | 411.12 | 417.40 | 423.68 | 429.98 |
According to the requirements of power quality supply voltage deviation (GB/T12325-2008), the highest point of voltage along a line of a low-voltage distribution network does not exceed 1.07pu, and the lowest point is not lower than 0.93pu, so that the user voltage on the line is 354-405 kV. Obviously, when a 0.06MW distributed household power supply is connected to the No. 8 user, the user voltage can not meet the power utilization requirement (the voltage Umax along the line is more than 405 kV).
Through the flow chart shown in fig. 2, the access positions of the distributed power supplies are optimized, after the power supply of the number 8 user is moved to the number 4, the feeder voltage just meets the requirement (the voltage along the line is 354kV or less and um in, and Umax or less and 405kV), and at this time, the voltages of the 8 users are as shown in the following table 2.
TABLE 2 feeder voltage distribution (unit: kV) when 0.06MW distributed power supply is connected to subscriber # 4
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Value of voltage | 386.19 | 392.40 | 398.63 | 404.87 | 404.42 | 404.08 | 403.86 | 403.75 |
Assuming that each subscriber load is 0.012MW, the distributed power supply is switched in at subscriber number 1, and the voltages of 8 subscribers on the feeder are shown in table 4 below. Obviously, when the distributed power supply is connected to the position of the No. 1 user, the power consumption requirement can not be met by the user voltage (the voltage Umin along the line is less than 354 kV).
Table 4 feeder voltage distribution when 0.02MW distributed power sources are respectively connected to users 1 and 2
(Unit: kV)
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Value of voltage | 370.95 | 360.71 | 351.68 | 343.96 | 337.65 | 332.82 | 329.56 | 327.91 |
Through the flow chart shown in fig. 2, the distributed power supply access position is optimized, after the power supply of the user number 1 is moved to the power supply number 8, the feeder line voltage still cannot meet the requirement along the line voltage Umin <354kV, and the voltages of 8 users at this time are shown in the following table 5.
TABLE 5 feeder voltage distribution when 0.02MW distributed power supply is connected to user number 1
(Unit: kV)
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Value of voltage | 370.95 | 363.15 | 356.67 | 351.60 | 347.99 | 345.91 | 345.39 | 346.44 |
Through the flow chart shown in fig. 2, the distributed power supply access capacity is optimized, the power supply capacity of the user number 8 is optimized to be 0.026MW, the maximum feeder voltage still cannot meet the requirement (the line voltage Umin is less than 354kV), and the voltages of the 8 users at this time are shown in table 6 below.
Table 6 feeder voltage distribution when 0.026MW distributed power supply is connected to user No. 8
(Unit: kV)
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Value of voltage | 371.74 | 364.76 | 359.13 | 354.92 | 352.20 | 350.99 | 351.33 | 353.21 |
At this time, the number of times k is optimized due to settingmaxAfter the upper limit is reached, the optimization process is skipped, at this time, the number of distributed power supplies (one power supply is added in number 7) and the total capacity are increased, distributed power supplies with the capacity of 0.015MW are respectively connected in number 7 and number 8, and the voltages of 8 users are shown in table 7 below. The calculation results in Table 7 show that the voltage at each user at this time has satisfied the requirements (line voltage 354 kV. ltoreq. Umin, Umax. ltoreq.405 kV).
Table 7 feeder voltage distribution when 0.015MW distributed power supply is connected to number 7 and 8 users, respectively
(Unit: kV)
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Value of voltage | 372.14 | 365.58 | 360.38 | 356.61 | 354.33 | 353.56 | 354.33 | 354.72 |
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A voltage calculation optimization method for a power distribution network feeder line to access a distributed power supply is characterized by comprising the following steps: the method comprises the following steps:
(1) firstly, according to the loading amount and the loading position of the distributed power supplies, all the distributed power supplies of a power distribution network feeder line are equivalent to a plurality of rigid PQ users with random access and unequal power;
(2) according to the feeder line model after the equivalence in the step (1), combining the user access position and the user load, and after the user load is equivalent to a PQ load node, calculating the power between any two users on the feeder line;
(3) according to the inter-user power calculation result in the step (2), combining the high-voltage side voltage U of the feeder line transformer0A feeder parameter Rn、XnCalculating the voltage value U along the feeder linen；
(4) According to the related requirements of power distribution network voltage management, the voltage values of all nodes along the line can be obtained according to the voltage along the feeder line solved in the step (3), the maximum value and the minimum value of the line voltage are prevented from exceeding the limit, and the access position and the capacity of the distributed power supply are optimized.
2. The method as claimed in claim 1 for voltage calculation optimization for distribution network feeder access to a distributed power supply, wherein: the value of P in the rigid PQ user is-PV，PVFor its installed capacity, Q is taken to be 0.
3. A method as claimed in claim 2, wherein the method comprises the steps of: the step (2) specifically comprises the following steps:
assuming that the total number of subscribers on the feeder is N, the load of any subscriber N is represented as PLn+jQLn＝Pn+jQn-PVn(n＝1,2,...,N)，
Wherein P isnIs the active load, Q, of any user nnIs the reactive load of any user n, PVnIs the active power output, P, of the distributed power supply of any user nn、Qn0 then there is no actual load, PVn0 then there is no distributed power access, Pn、QnAnd PVnIf the load is not 0, the load and the distributed power supply are accessed;
for any user N (1. ltoreq. N. ltoreq. N-1) and the power between the user N-1, there are:
4. a method as claimed in claim 3, wherein the method comprises the steps of: the step (3) specifically comprises the following steps:
suppose that the line impedance between the (n-1) th subscriber and the nth subscriber is Rn+jXn＝ln(r + jx) where lnThe feeder length between the (n-1) th user and the nth user is defined, r + jx is a unit length parameter of the feeder, and the voltage drop between the (n) th user and the (n-1) th user is defined as:
the voltage of the low-voltage side of the transformer of the power distribution network feeder line is assumed to be U0The voltage U of the nth user on the linenComprises the following steps:
because r > x in the power distribution network, the above formula is simplified as follows:
the pressure drop between the nth and the (n-1) th users is:
if it is
Can push out Un＜Un-1That is, the sum of active power of all loads backward from the nth and the (n-1) th user points is greater than that of all power suppliesWhen the generated power is summed, the voltage is reduced; if it is
Can push out Un＞Un-1When the sum of active power of all loads backward from the nth user point and the (n-1) th user point is smaller than the sum of generated power of all power supplies, the voltage rises.
5. The method for optimizing voltage calculation for access to a distributed power supply by a distribution network feeder according to claim 4, wherein the method comprises the following steps: the step (4) specifically comprises the following steps:
step (3) obtaining the voltage value U of each node along the feeder linenRear taking UnThe maximum value and the minimum value of the voltage are compared with the maximum point of the line voltage of the low-voltage distribution network line along the line voltage of not more than 1.07pu and the minimum point of not less than 0.93p according to the requirement of power quality supply voltage deviation (GB/T12325-2008), and if the maximum value and the minimum value of the voltage of the low-voltage distribution network line along the line voltage do not meet the requirement, the maximum value and the minimum value can be optimized according:
the number of the feeder lines connected to the distributed power supplies is p (p is more than or equal to 1 and less than or equal to N), and a vector Y describing the connection positions of the feeder lines is [ N ]1,n2,....,nN]Where 0 denotes no power access, 1 denotes power access, and the vector P describing its access capacity is PV1,PV2,....,PVN]0 represents no power access, and non-0 represents power access capacity;
if the highest value maxU of the line voltagenMore than 1.07pu, or minimum line voltage minUnIf the input voltage is less than 0.93pu, optimizing the position and the capacity of the distributed power supply on the feeder line;
in the optimization process, an upper limit value k of the optimization times is setmaxAnd an optimization order variable k: k is given as an initial value 1, k is equal to k +1 when the power supply access position and capacity are optimized once, and k is more than or equal to kmaxAnd stopping optimization and reselecting the power supply access quantity.
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Citations (3)
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