CN105958472A - Power distribution network operation optimization system - Google Patents

Abstract

Provided is a power distribution network operation optimization system which comprises a real-time database, a power distribution optimization computation module, a real-time querying and setting module, a parameter and historical data interface module, a DA server and interface module, and a configuration module. The power distribution network operation optimization system, by means of an automation information processing platform, optimizes a breaker configuration scheme and a power distribution network operation mode, significantly increases the supply reliability of the power distribution network and decreases a line loss.

Description

A kind of power distribution network operation optimizing system

Technical field

The present invention relates to power distribution network running technology field, a kind of system optimizing the power distribution network method of operation.

Background technology

Power distribution network be by overhead transmission line, cable, shaft tower, distribution transformer, disconnecting switch, reactive-load compensator and some attached set The composition such as execute, be the network playing important distribution electric energy effect in power network.Power distribution network is the important of national economy and social development Public infrastructure.In recent years, China's distribution network construction puts into and continues to increase, power distribution network development acquirement remarkable effect, but electricity consumption Level of relative international most advanced level still has gap, urban and rural areas disparate development, and power supply quality is to be improved.Power distribution network is electrical network End section, just as the blood capillary of human body, large number of, structure is complicated, loss is big.Meanwhile, power distribution network runs Reliability and the economical quality of life being directly connected to electricity consumption user and the economic benefit of grid company.

Summary of the invention

It is an object of the invention to provide a kind of power distribution network operation optimizing system, it passes through automated information processing platform, Realize optimization and the optimization of the power distribution network method of operation of chopper allocation plan, significantly improve electrical network power supply reliability, fall Low line loss.

It is an object of the invention to be realized by such technical scheme, it includes real-time data base, distribution optimization meter Calculate module, real-time query and setting module, parameter and historical data interface module, DA server and interface module and Configuration module；Configuration module and parameter and historical data base interface module data interaction, parameter and historical data bank interface Module and real-time data base data interaction, real-time data base optimizes computing module, real-time query and setting with distribution respectively Module and DA server and interface module data interaction.

Further, parameter and historical data interface module, it is used for accessing parameter database and historical data library file, bag Include reading and write, and carry out data interaction with real-time data base, set up data.

Further, real-time data base, set up real-time data base internal memory, for preserving the parameter needed for whole system is run With real-time status data；Set up unified data platform, be Optimization Calculation Program, real-time query program and outside simultaneously Data-interface program provides unified database service interface.

Further, DA server and interface module, for setting up the real-time data base of system, receive distribution SCADA System or SCADA system transmit the power distribution network real-time status data of coming, and described power distribution network real-time status data include There are on off state, supply voltage and customer charge.

Further, configuration module, it is used for creating parameter database, manages system parameter data storehouse, input system structure Parameter；Described management system parameter data storehouse includes increase, deletes, insert and revise operation；Described input system Structural parameters include system parameter table, distribution system parameter list, line parameter circuit value table, interconnection switch parameter list, segmentation Switch parameter table and load parameter table.

Further, real-time query and setting module, for real-time query distribution network system real-time status variable, manually repair Change or initialization system real-time status variable.

Further, distribution optimizes computing module, is used for calculating chopper best allocation scheme, calculates power distribution network optimum fortune Line mode, calculates the power supply reliability of subregion.

Further, the specific algorithm of described calculating chopper best allocation scheme is as follows:

P=Min (C_S+C_L)

In formula, C_SFor killer switch investment cost model, C_LFor load point interruption cost computation model；

$C_L=\underset{j=1}{\overset{n_{LP}}{\Σ}}\underset{t=1}{\overset{T_j}{\Σ}}{E}_{ENSjt}{C}_{Ljt}$

In formula: n_LPFor load point sum；T_jT is had for jth load point_jPlant interruption duration classification；E_ENStjFor load point j t Plant the dead electricity amount that interruption duration is corresponding；C_LjtFor the unit loss of outage that load point j t kind interruption duration is corresponding；

$C_s=\underset{j=1}{\overset{M}{\Σ}}\[N_j{C}_{Sj}\frac{{(1+i)}^{P_j}i}{{(1+i)}^{P_j}-1}\]$

In formula: M is switchtype sum；N_jThe number of units being installed in addition with is switched for jth kind；C_SjSeparate unit time-adjusted investment is switched for jth kind, I.e. present worth unit price；I is discount rate；P_jService life for jth kind switchgear；

Make P minimum, complete the configuration optimization of power distribution circuit breakers switch.

Further, the specifically comprising the following steps that of described calculating power distribution network optimal operation mode

1) single supply radial distribution networks system model is set up；

2) for power distribution network, set up by the decomposition algorithm of Complicated Distribution Network to single supply radial distribution networks；

3) power flow algorithm of the single supply radial distribution networks combining distribution SCADA is set up.；

4) set out based on loss minimization, on the premise of considering power supply reliability and safety further, calculate distribution The optimized operation compound mode of net chopper.

Further, step 2) described in the specifically comprising the following steps that of decomposition algorithm

2-1) read the topological structure parameter of many power supplys Complicated Distribution Network system, by whole circuit objects, interconnection switch The direction discernment traffic sign placement of object and block switch object is false；

2-2) with the power supply number in power distribution network as cyclic variable, the corresponding radial distribution of single supply of each power supply Net system model, and initialize the state variable of current single supply electricity distribution network model, state variable include the model number of plies and The bus number of each layer；

2-3) read the property parameters of current power, i.e. institute's connection line, and the mains side Search Flags of circuit is repaiied Changing into true, calculate the bus that institute's connection line is corresponding, the ground floor bus of this bus the most current single supply system, the One layer as current layer；

2-4) calculate whole attributes of the whole bus of current layer, including inlet highway, whole outlet line and all bear Carry branch road；

Whether whole output lead ways 2-5) judging the whole bus of current layer are 0；If 0, then terminate current electricity The calculating in source, otherwise adds 1 to busbar laminate number variable, and using whole output lead ways of whole for last layer buses as working as The bus number of front layer；

2-6) repeat step 2-4) and step 2-5), continue to calculate current single supply electricity distribution network model until completing；

2-7) mains cycle variable is added 1, repeat step 2-3), step 2-4), step 2-5) and step 2-6) Calculate the defeated shape distribution network system of penetrating of single supply corresponding to next power supply until the calculating completing all power；

Step 3) described in power flow algorithm as follows:

$\begin{array}{c}{\stackrel{\·}{I}}_{InLineNo}=\underset{i=1}{\overset{OutLineNum}{\Σ}}{\stackrel{\·}{I}}_{OutLine\[i\]}+\underset{j=1}{\overset{OutLoadNum}{\Σ}}{\stackrel{\·}{I}}_{OutLoad\[j\]}\\ =\underset{i=1}{\overset{OutLineNum}{\Σ}}{\stackrel{\·}{I}}_{OutLine\[i\]}+\underset{j=1}{\overset{OutLoadNum}{\Σ}}\frac{{\stackrel{\·}{S}}_{OutLoad\[j\]}}{{\stackrel{\·}{U}}_S}\end{array}$

In formula, OutLineNum is the output circuitry number of a certain bus；OutLoadNum is load number on a certain bus； Power input current for a certain bus；

$P_{TotalLoss\left(k\right)}=\underset{i=1}{\overset{BusLayerNum}{\Σ}}\underset{j=1}{\overset{{\mathrm{BusNum}}_{Layer\[i\]}}{\Σ}}{\left|I_{ij}\right|}^2{R}_{ij0}{L}_{ij}$

In formula, R_ij0It is the resistivity of circuit, L_ijIt is the length of circuit, P_TotalLoss(k)It it is the loss in kth time iterative process., BusLayerNum is the bus number of plies, BusNum_Layer[i]It it is the bus number of i-th layer.

Owing to have employed technique scheme, present invention have the advantage that:

(1) present invention carries out program development based on Visual C++6.0 language, has that calculating speed is fast and real-time property Strong advantage, is conducive to being extended by program function in next step is studied and going deep into；

(2) Database Systems compatibility Access and SQL Server system, be conducive to according to system scale and cost need into Row rationally selects；

(3) with platform feature, application function is carried out modularity to separate, set up whole system real-time server platform, it is simple to it His system sets up integrated function, convenient access electric power system power distribution SCADA and the data of SCADA dispatching system；

(4) based on unified data platform, supervision and the manual modification window of setting up real time data are easy to debugging；

(5) killer switch placement algorithm science, reliable, has stronger engineer applied and is worth；

(6) optimized operation scheme science, practical is drawn by optimized operation computational algorithm；

(7) the optimum evaluation criterion set up has taken into account operation of power networks reliability, science and economy simultaneously, has stronger answering By value.

Other advantages, target and the feature of the present invention will be illustrated to a certain extent in the following description, and And to a certain extent, will be apparent to those skilled in the art based on to investigating hereafter, or Person can be instructed from the practice of the present invention.The target of the present invention and other advantages can pass through description below Realize with claims and obtain.

Accompanying drawing explanation

The accompanying drawing of the present invention is described as follows.

Fig. 1 is single supply radial distribution networks system topology schematic diagram；

Fig. 2 is the graph of a relation between whole busbar laminate and whole buses of every layer；

Fig. 3 is the schematic flow sheet of decomposition algorithm；

Fig. 4 is the schematic flow sheet of the present invention.

Detailed description of the invention

The invention will be further described with embodiment below in conjunction with the accompanying drawings.

The operation interface of a kind of power distribution network operation optimizing system includes data maintenance and administration interface, real time data inquiry Interface is calculated with configuration optimization with manual modification interface and power distribution network running optimizatin.

Data maintenance and administration interface are the bases of whole system, the main topological structure processing power distribution network, are to set up to join Power network switch distributes the basis calculated with power distribution network optimal operation mode rationally.Whole distribution network system is mainly by following Table is constituted: system parameter table, distribution subsystem parameter list, line parameter circuit value table, interconnection switch parameter list, block switch are joined Number table, power parameter table and load parameter table, additionally, also switchtype table etc..

Real time data inquiry and manual modification interface, during calculating system load flow, need to use from distribution SCADA Or the real time data of SCADA dispatching system.The function of this subsystem is exactly the correctness monitoring real time data in real time, When real time data can not be received, can manually revise real time data to complete the calculating of optimal operation mode.

Power distribution network running optimizatin calculates interface with configuration optimization, including the sub-interface of distribution net work structure identification, distribution power flow meter Operator interface, chopper distribute sub-interface and the sub-interface of optimized operation computation schemes rationally.The sub-interface of distribution net work structure identification, Based on the network architecture parameters of power distribution network, transmit, in combination with by distribution SCADA system, the chopper real-time status of coming Calculating the structure of distribution network system, or configure system in real time according to given on off state vector, this function is Load flow calculation Premise.The sub-interface of distribution power system load flow calculation, the model calculated according to distribution net work structure recognizer, calculate distribution subsystem In system, trend distribution and grid are lost, and compare with optimum evaluation index.Chopper distributes sub-interface rationally, On the basis of topology identification, Load flow calculation and maintenance cost calculate, calculate the chopper allocation plan of optimum.Optimum Operating scheme calculates sub-interface, on the basis of network topology identification and Load flow calculation, by changing on off state vector Desired value under exploitation every kind state vector, and compare calculate optimized operation scheme according to desired value.

Fig. 1 is single supply radial distribution networks system topology schematic diagram, the basic thought that Complicated Distribution Network system load flow calculates Being Complicated Distribution Network to be decomposed into several single supply electric power distribution network systems carry out, the total losses of whole network are equal to whole single supplies The loss sum of subsystem.Therefore, the model setting up single supply radial distribution networks system is the basis calculating system loss, also It it is the precondition using forward-backward sweep method to calculate single supply distribution subsystem trend.

Owing to C Plus Plus has computational efficiency height, it is suitable for calculating in real time, with bus nodes as core, foundation C Plus Plus The object model represented is conducive to exploitation and the calculating of whole system.Between the whole busbar laminate of whole system and whole buses of every layer Relation can be summarized as Fig. 2.In Fig. 2, the data structure of each bus object is:

As it is shown on figure 3, step 2) described in the specifically comprising the following steps that of decomposition algorithm

2-1) read the topological structure parameter of many power supplys Complicated Distribution Network system, by whole circuit objects, interconnection switch The direction discernment traffic sign placement of object and block switch object is false；

2-2) with the power supply number in power distribution network as cyclic variable, the corresponding radial distribution of single supply of each power supply Net system model, and initialize the state variable of current single supply electricity distribution network model, state variable include the model number of plies and The bus number of each layer；

2-3) read the property parameters of current power, i.e. institute's connection line, and the mains side Search Flags of circuit is repaiied Changing into true, calculate the bus that institute's connection line is corresponding, the ground floor bus of this bus the most current single supply system, the One layer as current layer；

2-4) calculate whole attributes of the whole bus of current layer, including inlet highway, whole outlet line and all bear Carry branch road；

Whether whole output lead ways 2-5) judging the whole bus of current layer are 0；If 0, then terminate current electricity The calculating in source, otherwise adds 1 to busbar laminate number variable, and using whole output lead ways of whole for last layer buses as working as The bus number of front layer；

2-6) repeat step 2-4) and step 2-5), continue to calculate current single supply electricity distribution network model until completing；

2-7) mains cycle variable is added 1, repeat step 2-3), step 2-4), step 2-5) and step 2-6) Calculate the defeated shape distribution network system of penetrating of single supply corresponding to next power supply until the calculating completing all power；

Embodiment:

The present invention is applied at certain switching station distribution network system, and certain switching station distribution network system is by A transformer station and B Transformer station powers, and there is feeder pillar middle connection.According to the using method of the developed software system of this project, first summarize The network model of certain switching station distribution network system, including 2 power supplys, 13 circuits, 1 interconnection switch, 6 segmentations Switch, 12 nodes and 17 loads.Table 1 is shown that the load that certain switching station distribution network system is administrative.

Certain administrative load meter of switching station distribution network system of table 1

Table 2 is the administrative distribution line of certain switching station distribution network system and length thereof.Wherein, the circuit of a length of 0 be for The virtual circuit meeting topology controlment needs and increase.

Certain administrative circuit table of switching station distribution network system of table 2

On the premise of meeting distribution network system reliability, there are three kinds of typical powering modes in certain switching station distribution network system, As shown in table 3.

Certain switching station distribution network system powering mode table of table 3

Numbering	Mode state
		1	Interconnection switch disconnects, and other switch conjunction
2	601 switch off, and other switch conjunction
		3	602 switch off, and other switch conjunction

The present invention is respectively all load is in rated value state and bus I is in underloading and bus II is in rated condition The optimized operation pattern of certain switching station distribution network system, and comparative analysis operation result is calculated under 2 kinds of load patterns.

(1), under rated load state

Line losses management corresponding when pattern one, two is run with three times respectively, result is as shown in table 4:

Certain switching station of table 4 the most each powering mode correspondence network loss table

Numbering	Mode state	Corresponding loss (kW)
			1	Interconnection switch disconnects, and other switch conjunction	380.5
2	601 switch off, and other switch conjunction	711.1
			3	602 switch off, and other switch conjunction	423.2

From table 4, under nominal load operating mode, the network loss of pattern 1 correspondence is minimum, calculates the most herein The power distribution network method of operation is optimum, loss minimization.If operating in other both of which, network loss will increase 330.6kW respectively And 42.7kW.

(2), bus I be in underloading, bus II is in rated value

When the load of system changes, it is assumed that the actual value of whole load of a certain moment is as shown in table 5

Certain switching station system of table 5 a certain change moment forecast load meter (bus I underloading)

Load is numbered	Load name	Load rated power
			1	3B	20kVA
2	5B	10kVA
			3	7B	20kVA
4	8B	10kVA
			5	9B	10kVA
6	10B	10kVA
			7	12B	10kVA
8	11B	1000kVA
			9	6B	1000kVA
10	4B	1000kVA
			11	2B	1000kVA
12	Specially become 1B	1250kVA
			13	1B	800kVA
14	2B	630kVA
			15	3B	630kVA
16	Load 16	1000kVA
			17	Load 17	800kVA

The actual power all loaded is set as the given operating mode value of table 5, calculates optimized operation pattern, optimize operation side Formula is: disconnect 602 switches, and close interconnection switch and other 5 block switches.Meanwhile, it is respectively provided with listed by table 3 complete Portion's powering mode also calculates corresponding network loss.Under bus I underloading load condition, network loss corresponding when pattern is once run Calculate；Under bus I underloading load condition, the line losses management that pattern is corresponding when running for two times；At bus I underloading load Under state, the line losses management that pattern is corresponding when running for three times.

Conclude the result of calculation that three of the above powering mode is corresponding, as shown in table 6.

The powering mode table under bus I light duty of certain electric substation of table 6

Numbering	Mode state	Corresponding loss (kW)
			1	Interconnection switch disconnects, and other switch conjunction	272.3
2	601 switch off, and other switch conjunction	277.0
			3	602 switch off, and other switch conjunction	168.8

Visible, it is under rated value operating mode at bus I underloading, bus II, network loss corresponding to the operational mode that calculates is The likely minima of network loss under pattern, the most now pattern 3 is the optimum method of operation.If empirically will system System operates in pattern 1, then network loss will increase 103.5kW.

It can be seen that the power distribution network optimization system that the present invention develops can be according to the real-time change of load from analysis above Provide the optimized operation pattern of distribution network system, loss minimization, thus improve the economy that power distribution network runs.

Finally illustrating, above example is only in order to illustrate technical scheme and unrestricted, although with reference to preferably The present invention has been described in detail by embodiment, it will be understood by those within the art that, can be to the skill of the present invention Art scheme is modified or equivalent, and without deviating from objective and the scope of the technical program, it all should be contained at this In the middle of bright right.

Claims (10)

1. a power distribution network operation optimizing system, it is characterised in that described system includes real-time data base, distribution Optimize computing module, real-time query and setting module, parameter and historical data interface module, DA server and interface Module and configuration module；Configuration module and parameter and historical data base interface module data interaction, parameter and historical data Bank interface module and real-time data base data interaction, real-time data base optimizes computing module, real-time query with distribution respectively With setting module and DA server and interface module data interaction.

2. power distribution network operation optimizing system as claimed in claim 1, it is characterised in that: parameter connects with historical data Mouth die block, is used for accessing parameter database and historical data library file, including reading and write, and and real-time data base Carry out data interaction, set up data.

3. power distribution network operation optimizing system as claimed in claim 1, it is characterised in that: real-time data base, set up Real-time data base internal memory, for preserving the parameter needed for whole system is run and real-time status data；Set up unified number According to platform, provide unified data clothes for Optimization Calculation Program, real-time query program and external data interface program simultaneously Business interface.

4. power distribution network operation optimizing system as claimed in claim 1, it is characterised in that: DA server and interface mould Block, for setting up the real-time data base of system, receives distribution SCADA system or SCADA system transmits joining Electrical network real-time status data, described power distribution network real-time status data include on off state, supply voltage and customer charge.

5. power distribution network operation optimizing system as claimed in claim 1, it is characterised in that: configuration module, it is used for creating Build parameter database, manage system parameter data storehouse, input system structural parameters；Described management system parameter data storehouse Include increase, delete, insert and revise operation；Described input system structural parameters include system parameter table, join Electricity system parameter table, line parameter circuit value table, interconnection switch parameter list, block switch parameter list and load parameter table.

6. power distribution network operation optimizing system as claimed in claim 1, it is characterised in that: real-time query and setting mould Block, for real-time query distribution network system real-time status variable, manual modification or initialization system real-time status variable.

7. power distribution network operation optimizing system as claimed in claim 1, it is characterised in that: distribution optimizes computing module, For calculating chopper best allocation scheme, calculate power distribution network optimal operation mode, calculate the power supply reliability of subregion.

8. power distribution network operation optimizing system as claimed in claim 7, it is characterised in that described calculating chopper is The specific algorithm of good allocation plan is as follows:

P=Min (C_S+C_L)

In formula, C_SFor killer switch investment cost model, C_LFor load point interruption cost computation model；

$C_L=\underset{j=1}{\overset{n_{LP}}{\Σ}}\underset{t=1}{\overset{T_j}{\Σ}}{E}_{ENSjt}{C}_{Ljt}$

In formula: n_LPFor load point sum；T_jT is had for jth load point_jPlant interruption duration classification；E_ENStjFor load point j t Plant the dead electricity amount that interruption duration is corresponding；C_LjtFor the unit loss of outage that load point j t kind interruption duration is corresponding；

$C_s=\underset{j=1}{\overset{M}{\Σ}}\[N_j{C}_{Sj}\frac{{(1+i)}^{P_j}i}{{(1+i)}^{P_j}-1}\]$

In formula: M is switchtype sum；N_jThe number of units being installed in addition with is switched for jth kind；C_SjSeparate unit time-adjusted investment is switched for jth kind, I.e. present worth unit price；I is discount rate；P_jService life for jth kind switchgear；

Make P minimum, complete the configuration optimization of power distribution circuit breakers switch.

9. power distribution network operation optimizing system as claimed in claim 7, it is characterised in that described calculating power distribution network is Specifically comprising the following steps that of the excellent method of operation

1) single supply radial distribution networks system model is set up；

2) for power distribution network, set up by the decomposition algorithm of Complicated Distribution Network to single supply radial distribution networks；

3) power flow algorithm of the single supply radial distribution networks combining distribution SCADA is set up；

4) set out based on loss minimization, on the premise of considering power supply reliability and safety further, calculate distribution The optimized operation compound mode of net chopper.

10. power distribution network operation optimizing system as claimed in claim 9, it is characterised in that step 2) described in point Specifically comprising the following steps that of resolving Algorithm

2-1) read the topological structure parameter of many power supplys Complicated Distribution Network system, by whole circuit objects, interconnection switch The direction discernment traffic sign placement of object and block switch object is false；

2-2) with the power supply number in power distribution network as cyclic variable, the corresponding radial distribution of single supply of each power supply Net system model, and initialize the state variable of current single supply electricity distribution network model, state variable include the model number of plies and The bus number of each layer；

2-3) read the property parameters of current power, i.e. institute's connection line, and the mains side Search Flags of circuit is repaiied Changing into true, calculate the bus that institute's connection line is corresponding, the ground floor bus of this bus the most current single supply system, the One layer as current layer；

2-4) calculate whole attributes of the whole bus of current layer, including inlet highway, whole outlet line and all bear Carry branch road；

Whether whole output lead ways 2-5) judging the whole bus of current layer are 0；If 0, then terminate current electricity The calculating in source, otherwise adds 1 to busbar laminate number variable, and using whole output lead ways of whole for last layer buses as working as The bus number of front layer；

2-6) repeat step 2-4) and step 2-5), continue to calculate current single supply electricity distribution network model until completing；

2-7) mains cycle variable is added 1, repeat step 2-3), step 2-4), step 2-5) and step 2-6) Calculate the defeated shape distribution network system of penetrating of single supply corresponding to next power supply until the calculating completing all power；

Step 3) described in power flow algorithm as follows:

$\begin{array}{c}{\stackrel{\·}{I}}_{InLineNo}=\underset{i=1}{\overset{OutLineNum}{\mathrm{\Σ}}}{\stackrel{\·}{I}}_{OutLine\[i\]}+\underset{j=1}{\overset{OutLoadNum}{\mathrm{\Σ}}}{\stackrel{\·}{I}}_{OutLoad\[j\]}\\ =\underset{i=1}{\overset{OutLineNum}{\mathrm{\Σ}}}{\stackrel{\·}{I}}_{OutLine\[i\]}+\underset{j=1}{\overset{OutLoadNum}{\mathrm{\Σ}}}\frac{{\stackrel{\·}{S}}_{OutLoad\[j\]}}{{\stackrel{\·}{U}}_S}\end{array}$

In formula, OutLineNum is the output circuitry number of a certain bus；OutLoadNum is load number on a certain bus； Power input current for a certain bus；

$P_{TotalLoss\left(k\right)}=\underset{i=1}{\overset{BusLayerNum}{\Σ}}\underset{j=1}{\overset{{\mathrm{BusNum}}_{Layer\[i\]}}{\Σ}}|I_{ij}{|}^2{R}_{ij0}{L}_{ij}$

In formula, R_ij0It is the resistivity of circuit, L_ijIt is the length of circuit, P_TotalLoss(k)It it is the loss in kth time iterative process, BusLayerNum is the bus number of plies, BusNum_Layer[i]It it is the bus number of i-th layer.