CN107453347B - Regional power distribution network power supply capacity evaluation method - Google Patents
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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
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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
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Abstract
The invention relates to a method for evaluating the power supply capacity of a regional power distribution network, which comprises the following steps: step 1: establishing a power supply capability evaluation index system of the main equipment of the power distribution network; step 2: establishing a same-layer equipment overall power supply capability evaluation index system; and step 3: establishing a power supply capacity evaluation index system of a power distribution system; the technical scheme provided by the invention aims to establish a power supply capacity evaluation system from the single equipment to the power distribution system based on less topological information, and provides power supply capacity evaluation models respectively aiming at three levels of the single equipment, the same-layer equipment and the power distribution system, wherein each level comprises three evaluation indexes, namely maximum power supply capacity, power supply capacity reserve and power supply capacity margin.
Description
Technical Field
The invention relates to the field of power supply capacity of a power distribution network, in particular to a method for evaluating the power supply capacity of a regional power distribution network.
Background
The power supply capacity of the power distribution network assigns the capacity of bearing load of the power grid on the premise of ensuring safe operation. The problem of weak power supply capacity of a power distribution network is an urgent task in power grid development, so that scientific and reasonable evaluation of the power supply capacity (namely load supply capacity) of a power distribution system becomes a key for fine evaluation and planning construction of the current power grid.
In the existing research, two types of calculation methods for the power supply capacity of a power distribution system are mainly used, namely a method based on power flow calculation of a power distribution network and a method based on safe and reliable operation of the power distribution network. The most direct method in the power distribution network load flow calculation-based method is an attempt method, and the maximum load value which can be borne by the system is obtained by continuously adjusting the load and repeatedly performing load flow calculation; secondly, various optimization models for evaluating the power supply capacity of the power distribution network are provided based on the power flow model of the power grid, and the calculation scale and the calculation difficulty of the method are increased when the equipment scale in the power distribution network is large. In the method based on the safe and reliable operation of the power distribution network, a capacity-load ratio method is relatively rough, and the power supply capacity of the power distribution network is reflected on the whole by calculating the index of the capacity-load ratio; in addition, a power distribution network power supply capacity calculation method considering an N-1 safety criterion is also provided, the power distribution network load transfer capacity under N-1 verification is considered mainly based on the interconnection relation of main transformers, load transfer among transformer substations and the like, the method needs to comprehensively master the network topology relation of the power distribution network, mainly aims at the hierarchy expansion of the main transformers, and involves less power supply capacity of other types of equipment.
With the continuous development of the power distribution network, the requirements on the accuracy, comprehensiveness, rapidity and convenience of power distribution network power supply capacity calculation are higher and higher, and therefore a rapid and flexible power distribution network equipment and system power supply capacity evaluation method is urgently needed.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a method for evaluating the power supply capacity of a regional power distribution network, which aims to establish a power supply capacity evaluation system from single equipment to a power distribution system based on less topological information, and provide power supply capacity evaluation models for three levels of the single equipment, the same-layer equipment and the power distribution system, wherein each level comprises three evaluation indexes, namely maximum available power supply capacity, power supply capacity reserve and power supply capacity margin.
The purpose of the invention is realized by adopting the following technical scheme:
the invention provides a method for evaluating the power supply capacity of an area power distribution network, which is improved in that the method comprises the following steps:
step 1: establishing a power supply capability evaluation index system of the main equipment of the power distribution network;
step 2: establishing a same-layer equipment overall power supply capability evaluation index system;
and step 3: and establishing a power supply capability evaluation index system of the power distribution system.
Further, in step 1, the power supply capability evaluation index system of the power distribution network main equipment includes:
the maximum power supply capacity of the main equipment of the power grid is represented by the following formula:
SC＝k·PU
the power supply capacity reserve of the main equipment of the power grid is represented by the following formula:
SCR＝SC-Pmax
and the power supply capacity margin of the main equipment of the power grid is represented by the following formula:
in the formula: SC: the maximum power supply capacity of the main equipment of the power grid; pU: the maximum deliverable load when the main equipment of the power grid meets basic safety criteria (such as N-1 safety criteria) and other operation constraints (such as conditions of voltage constraint, operation environment, maintenance requirement and the like) is considered; k: overload coefficient, the main transformer is 1-1.3, and the line and distribution transformer is 1; SCR: power supply capacity storage of the main equipment of the power grid; pmax: annual maximum load of the main equipment of the power grid; SCM: and the power supply capacity margin of the main equipment of the power grid.
Further, the maximum power supply capacity of each type of equipment is calculated in the following way:
<1> maximum power supply capacity of main transformer:
the maximum power supply capacity of the transformer substation is the transformer substation capacity after the maximum main variable capacity is deducted, and the maximum power supply capacity calculation formula of each transformer substation is as follows:
in the formula: SC (Single chip computer)s: the maximum power supply capacity of the transformer substation is achieved; t: the number of main transformers of the transformer substation is increased; p1.0_tThe maximum transformation capacity of the t-th main transformer is obtained;
the maximum single capacity in a main transformer of the transformer substation;
the maximum power supply capacity of the main transformers is distributed to each main transformer in proportion according to the main variable capacity in the transformer substation from the maximum power supply capacity of the transformer substation;
<2> maximum power supply capability of line:
the maximum power supply capacity of a line is firstly determined by P of the line1.0_tNamely, the maximum conveyable load under the conditions of considering the rated capacity of the equipment, the operating environment and the requirements of maintenance and repair without considering the N-1 safety criterionLoading; secondly, determining P according to the wiring mode of the lineU/P1.0The determination principle is as follows:
high voltage line PU/P1.0The values are as follows: single radiation: 1.0; double radiation, double chain, single ring network, single chain network: 0.5; other companies: 0.5; other users: 1.0;
medium voltage line PU/P1.0The values are as follows: single radiation, single shot: 1.0; two connections are as follows: 0.67; three connections and above: 0.75; monocyclic, single, bicyclic, bijective: 0.5; other companies: 0.5; other users: 1.0;
according to P1.0_tValue of (A) and PU/P1.0The maximum power supply capacity of the line can be obtained by the ratio.
<3> maximum power supply capability of distribution transformer: the maximum power supply capacity of the distribution transformer is the maximum transformation capacity of the distribution transformer.
Further, in the step 2, the overall power supply capability evaluation index system of the same-layer device includes:
the total maximum power supply capacity of the same-layer equipment is represented by the following formula:
and storing the total power supply capacity of the same-layer equipment, which is represented by the following formula:
and thirdly, the total power supply capacity margin of the same-layer equipment is represented by the following formula:
in the formula: GSCiThe method comprises the steps that the maximum power supply capacity of the ith layer of equipment is set as 1,2,3 and 4 respectively correspond to a high-voltage line, a transformer substation, a medium-voltage line and a distribution transformer; miThe total number of the ith type of equipment; SC (Single chip computer)jIs as followsMaximum power suppliable capabilities of the j devices; GSCRiStoring the total power supply capacity of the ith layer of equipment, wherein i is 1,2,3 and 4 respectively corresponds to a high-voltage line, a transformer substation, a medium-voltage line and a distribution transformer; SCR (Selective catalytic reduction)jFor reserve of power supply capability of j-th equipment, GSCMi: the overall power supply capacity margin of the ith layer of equipment, i is 1,2,3 and 4 respectively corresponding to a high-voltage line, a transformer substation, a medium-voltage line and a distribution transformer.
Further, in step 3, the power distribution system power supply capability evaluation index system includes:
the maximum power supply capacity of the system is represented by the following formula:
system power supply capacity reserve, represented by:
the system power supply capacity margin is represented by the following formula:
in the formula: SSC: maximum power supply capacity of the power distribution system; SC (Single chip computer)IL_kThe maximum power supply capacity of the inlet wire of the kth power distribution system; k represents the number of incoming lines of the kth power distribution system; SC (Single chip computer)OL_lThe maximum power supply capacity of the outlet wire of the first power distribution system; l represents the outgoing line number of the first power distribution system; IL is the number of incoming lines of the power distribution system; OL is the number of outgoing lines of the power distribution system; and (4) SSCR: power distribution system power supply capacity reserve; pmaxIL_kThe annual maximum load of the inlet wire of the kth power distribution system; pmaxIL_lThe annual maximum load of the outgoing line of the first power distribution system; and (4) SSCM: and the power supply capacity margin of the power distribution system.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
the power supply capacity evaluation model provided by the invention can evaluate the power supply capacity of three levels of single equipment, same-layer equipment and a power distribution system based on less topological structure information of the power distribution network, wherein each level comprises three evaluation indexes, namely maximum power supply capacity, power supply capacity reserve and power supply capacity margin.
By evaluating the power supply capacity of each level, the method is beneficial to power distribution network planning and operating personnel to accurately position problems in the aspect of power distribution network power supply capacity, provides technical support for the links of power distribution network investment decision, planning and design, operation and maintenance and the like, and guides the investment, construction and development of the power distribution network to be more orderly.
Drawings
Fig. 1 is a simple schematic diagram of a system power supply capability model provided by the invention. .
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments of the invention may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed.
The invention aims to establish a power supply capacity evaluation system from single equipment to a power distribution system based on less topological information, and provides a power supply capacity evaluation model aiming at three levels of the single equipment, the same-layer equipment and the power distribution system, wherein each level comprises three evaluation indexes, namely maximum power supply capacity, power supply capacity reserve and power supply capacity margin.
The invention provides a method for evaluating the power supply capacity of a regional distribution network, wherein a simple schematic diagram of a system power supply capacity model is shown in figure 1, and the method comprises the following steps:
(1) determining power supply capacity evaluation index of main equipment of power distribution network
Maximum power supply capacity of equipment
SC＝k·PU
In the formula:
SC (supply Capacity): the maximum power supply capacity of the main equipment of the power distribution network;
PU: maximum deliverable load when the distribution network master equipment meets basic safety criteria (such as N-1 safety criteria) and other operation constraints (such as conditions of considering voltage constraints, operation environment, overhaul and maintenance requirements and the like);
k: overload coefficient, the main transformer is 1-1.3, and the line and distribution transformer is 1;
the maximum power supply capacity of each type of equipment is calculated by adopting the following method:
● maximum power supply capacity of main transformer
The maximum power supply capacity of the transformer substation is the transformer substation capacity after the maximum main variable capacity is deducted, and the maximum power supply capacity calculation formula of each transformer substation is as follows:
in the formula:
SCs: the maximum power supply capacity of the transformer substation is achieved;
t: the number of main transformers of the transformer substation is increased;
P1.0_tthe maximum transformation capacity of the t-th main transformer is obtained;
The maximum power supply capacity of the main transformers is distributed to each main transformer in proportion according to the main variable capacity in the transformer substation from the maximum power supply capacity of the transformer substation.
● maximum power supply capacity of line
The maximum power supply capacity of a line is firstly determined by P of the line1.0_tThe maximum transportable load under the conditions of comprehensively considering the rated capacity of equipment, the operating environment, the overhaul and maintenance requirements and the like (not considering the N-1 safety criterion); secondly, determining P according to the wiring mode of the lineU/P1.0The determination principle is as follows:
high voltage line PU/P1.0The values are as follows: single radiation: 1.0; double radiation, double chain, single ring network, single chain network: 0.5; other (company): 0.5; other (user): 1.0.
medium voltage line PU/P1.0The values are as follows: single radiation, single shot: 1.0; two connections are as follows: 0.67; three connections and above: 0.75; monocyclic, single, bicyclic, bijective: 0.5; other (company): 0.5; other (user): 1.0.
according to P1.0_tValue of (A) and PU/P1.0The maximum power supply capacity of the line can be obtained by the ratio.
● maximum power supply capability of distribution transformer
The maximum power supply capacity of the distribution transformer is the maximum transformation capacity of the distribution transformer. The overload factor is not considered for the moment.
Device power supply capability reserve
SCR＝SC-Pmax
In the formula:
SCR (supply CapacityReserve): device power supply capacity reserve;
Pmax: the annual maximum load of the equipment.
Note:
● the annual maximum load of the transformer substation needs to be added with the loads of the main transformers belonging to the transformer substation at the same time to obtain the annual load curve of the transformer substation, and then the maximum load of the whole substation is obtained.
● main transformer power supply capacity reserve, which is to distribute the power supply capacity reserve of the transformer substation to each main transformer according to the main variable capacity in the substation in proportion.
Power supply capacity margin of equipment
In the formula:
SCM (supply Capacity margin): a device power supply capability margin;
note: the main transformer power supply capacity margin is equal to the transformer substation power supply capacity margin.
(2) Determining evaluation index of overall power supply capacity of same-layer equipment
The same-layer equipment refers to the same kind of equipment with the same voltage class.
The overall maximum power supply capacity of the same-layer equipment
In the formula:
GSCithe General Supply Capacity is the maximum power Supply Capacity of the ith layer of equipment, and i is 1,2,3 and 4 respectively corresponding to a high-voltage line, a transformer substation, a medium-voltage line and a distribution transformer;
Mithe total number of the ith type of equipment;
SCjthe maximum power-suppliable capacity of the jth device.
Note: when the maximum power supply capacity of a local city company is calculated, the maximum power supply capacity of the company in the district (county) can be superposed; when the maximum power supply capacity of the provincial company is calculated, the maximum power supply capacity of the companies in the local city under the jurisdiction can be superposed; and calculating the maximum power supply capacity of the national grid company, and superposing the maximum power supply capacities of the available provincial companies.
Overall power supply capacity reserve of same-layer equipment
In the formula:
GSCRi(General Supply Capacity Reserve) as the i-th layer deviceThe total power supply capacity is reserved, i is 1,2,3 and 4 respectively corresponding to a high-voltage line, a transformer substation, a medium-voltage line and a distribution transformer;
Mithe total number of the ith type of equipment;
SCRjreserve the power supply capacity of the jth device.
Note: when the power supply capacity reserve of a local city company is calculated, the power supply capacity reserve of the company in the district (county) can be used for superposition; the method comprises the steps that when the power supply capacity reserve of a provincial company is calculated, the power supply capacity reserve of the company in the city of the jurisdiction can be used for superposition; and when the power supply capacity reserve of the national grid company is calculated, the power supply capacity reserve of the provincial company can be superposed.
③ the same layer equipment overall power supply capacity margin
In the formula:
GSCMi(General Supply Capacity Margin): the overall power supply capacity margin of the ith layer of equipment, i is 1,2,3 and 4 respectively corresponding to a high-voltage line, a transformer substation, a medium-voltage line and a distribution transformer.
(3) Determining power supply capacity evaluation index of power distribution system
The basic idea of evaluating the power supply capacity of the power distribution system is to take the whole area as a whole and only consider the incoming line and the outgoing line of the whole, wherein the incoming line also comprises the power outgoing line in the area (because the power outgoing line in the area is similar to the incoming line, the power outgoing line in the area can be regarded as the power line of the area power distribution network). The maximum power supply capacity of the system is the difference between the sum of the maximum power supply capacities of all incoming lines and the sum of the maximum power supply capacities of all outgoing lines, the reserve of the power supply capacity of the system is the difference between the sum of the reserve of the power supply capacities of all incoming lines and the sum of the reserve of the power supply capacities of all outgoing lines, and the margin of the power supply capacity of the system is the ratio of the reserve of the power supply capacity of the system to the maximum power supply capacity of the system.
Note:
●, because the scale of the regional level is small, incoming and outgoing lines are not easy to distinguish, and the power supply capacity of the power distribution system at the level of county (district), city and province is only calculated without calculation;
● have a top-bottom power supply relationship in-line (out-line) considering only the line of the highest voltage class.
Maximum power supply capacity of system
In the formula:
SSC (System Supply Capacity): maximum power supply capacity of the power distribution system;
SCIL_kthe system incoming line also comprises a power supply outgoing line in the area (the same applies later, because the power supply outgoing line in the system is also similar to the system incoming line, the power supply outgoing line in the system is a power supply line of the system);
SCOL_lthe maximum power supply capacity of the outgoing line of the first system;
IL is the number of incoming lines of the power distribution system;
OL is the number of outgoing lines of the power distribution system.
System power supply capacity reserve
In the formula:
SSCR (System Supply Capacity Reserve): power distribution system power supply capacity reserve;
PmaxIL_kthe annual maximum load of the incoming line of the kth system;
PmaxIL_lthe annual maximum load of the outgoing line of the first system.
Power supply capacity margin of system
In the formula:
SSCM (System Supply Capacity Margin): and the power supply capacity margin of the power distribution system.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (1)
1. A method for evaluating the power supply capacity of a regional distribution network is characterized by comprising the following steps:
step 1: establishing a power supply capability evaluation index system of the main equipment of the power distribution network;
step 2: establishing a same-layer equipment overall power supply capability evaluation index system;
and step 3: establishing a power supply capacity evaluation index system of a power distribution system;
in step 1, the power supply capability evaluation index system of the power distribution network main equipment comprises:
the maximum power supply capacity of the main equipment of the power grid is represented by the following formula:
SC＝k·PU
the power supply capacity reserve of the main equipment of the power grid is represented by the following formula:
SCR＝SC-Pmax
and the power supply capacity margin of the main equipment of the power grid is represented by the following formula:
in the formula: SC: the maximum power supply capacity of the main equipment of the power grid; pU: the maximum transferable load when the main equipment of the power grid meets the N-1 safety criterion and the voltage constraint, the operating environment and the overhaul and maintenance requirement conditions; k: overload coefficient, the main transformer is 1-1.3, and the line and distribution transformer is 1; SCR: power supply capacity storage of the main equipment of the power grid; pmax: annual maximum load of the main equipment of the power grid; SCM: the power supply capacity margin of the main equipment of the power grid;
the maximum power supply capacity of each type of equipment is calculated by adopting the following method:
<1> maximum power supply capacity of main transformer:
the maximum power supply capacity of the transformer substation is the transformer substation capacity after the maximum main variable capacity is deducted, and the maximum power supply capacity calculation formula of each transformer substation is as follows:
in the formula: SC (Single chip computer)sThe maximum power supply capacity of the transformer substation is achieved; t: the number of main transformers of the transformer substation is increased; p1.0_tThe maximum transformation capacity of the t-th main transformer is obtained;
the maximum single capacity in a main transformer of a transformer substation is obtained;
the maximum power supply capacity of the main transformers is distributed to each main transformer in proportion according to the main variable capacity in the transformer substation from the maximum power supply capacity of the transformer substation;
<2> maximum power supply capability of line:
the maximum power supply capacity of a line is firstly determined by P of the line1.0_tThe maximum transportable load under the conditions of equipment rated capacity, operating environment and overhaul and maintenance requirements is comprehensively considered without considering the N-1 safety criterion; secondly, determining P according to the wiring mode of the lineU/P1.0The determination principle is as follows:
high voltage line PU/P1.0The values are as follows: single radiation: 1.0; double radiation, double chain, single ring network, single chain network: 0.5; other companies: 0.5; other users: 1.0;
medium voltage line PU/P1.0The values are as follows: single radiation, single shot: 1.0; two connections are as follows: 0.67; three connections and above: 0.75; monocyclic, single, bicyclic, bijective: 0.5; other companies: 0.5; other users: 1.0;
according to P1.0_tValue of (A) and PU/P1.0The maximum power supply capacity of the line can be obtained by the ratio;
<3> maximum power supply capability of distribution transformer: the maximum power supply capacity of the distribution transformer is the maximum transformation capacity of the distribution transformer;
in step 2, the overall power supply capability evaluation index system of the same-layer equipment comprises:
the total maximum power supply capacity of the same-layer equipment is represented by the following formula:
and storing the total power supply capacity of the same-layer equipment, which is represented by the following formula:
and thirdly, the total power supply capacity margin of the same-layer equipment is represented by the following formula:
in the formula: GSCiThe method comprises the steps that the maximum power supply capacity is the total maximum power supply capacity of the ith layer of equipment, i is 1,2,3 and 4 and corresponds to a high-voltage line, a transformer substation, a medium-voltage line and a distribution transformer respectively; miThe total number of the ith type of equipment; SC (Single chip computer)jMaximum powerable capacity for jth device; GSCRiStoring the total power supply capacity of the ith layer of equipment, wherein i is 1,2,3 and 4 and corresponds to a high-voltage line, a transformer substation, a medium-voltage line and a distribution transformer respectively; SCR (Selective catalytic reduction)jFor reserve of power supply capability of j-th equipment, GSCMi: the overall power supply capacity margin of the ith layer of equipment, i is 1,2,3 and 4, and corresponds to a high-voltage line, a transformer substation, a medium-voltage line and a distribution transformer respectively;
in step 3, the power distribution system power supply capability evaluation index system includes:
the maximum power supply capacity of the system is represented by the following formula:
system power supply capacity reserve, represented by:
the system power supply capacity margin is represented by the following formula:
in the formula: SSC: maximum power supply capacity of the power distribution system; SC (Single chip computer)IL_kThe maximum power supply capacity of the inlet wire of the kth power distribution system; k represents the number of incoming lines of the kth power distribution system; SC (Single chip computer)OL_lThe maximum power supply capacity of the outlet wire of the first power distribution system; l represents the outgoing line number of the first power distribution system; IL is the number of incoming lines of the power distribution system; OL is the number of outgoing lines of the power distribution system; and (4) SSCR: power distribution system power supply capacity reserve; pmaxIL_kThe annual maximum load of the inlet wire of the kth power distribution system; pmaxIL_lThe annual maximum load of the outgoing line of the first power distribution system; and (4) SSCM: and the power supply capacity margin of the power distribution system.
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| CN102025153A (en) * | 2010-12-15 | 2011-04-20 | 天津大学 | Method for accurately calculating maximum power supply capacity of medium voltage distribution network |
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| CA2472885A1 (en) * | 2003-07-01 | 2005-01-01 | Accenture Global Services Gmbh | Shareholder value tool |
| CN101252280A (en) * | 2008-04-08 | 2008-08-27 | 昆明理工大学 | On-line evaluating method of urban network max power supply capability |
| CN101431238A (en) * | 2008-09-12 | 2009-05-13 | 天津天大求实电力新技术股份有限公司 | Power distribution network power supply capacity evaluation method considering N-1 criterion |
| CN102025153A (en) * | 2010-12-15 | 2011-04-20 | 天津大学 | Method for accurately calculating maximum power supply capacity of medium voltage distribution network |
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