CN108599181A - It is a kind of based on the power distribution network DG inverter powerless control methods locally measured - Google Patents
It is a kind of based on the power distribution network DG inverter powerless control methods locally measured Download PDFInfo
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- CN108599181A CN108599181A CN201810312930.9A CN201810312930A CN108599181A CN 108599181 A CN108599181 A CN 108599181A CN 201810312930 A CN201810312930 A CN 201810312930A CN 108599181 A CN108599181 A CN 108599181A
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The present invention provides a kind of based on the power distribution network DG inverter powerless control methods locally measured.This method comprises the following steps：（1）Obtain the node that power distribution network is equipped with measuring device；（2）Power distribution network is divided into the idle control partition of multiple wide areas according to measurement node and is numbered；（3）The idle relation between supply and demand of each subregion of survey calculation；（4）The idle generating optimization model of DG inverters is established according to the idle relation between supply and demand of each subregion；（5）Fixed idle output setting valve of each DG inverters within dispatching cycle is determined according to optimum results.The present invention proposes a kind of based on the power distribution network DG inverter powerless control methods locally measured, it can be used for determining the idle output setting valve of DG inverters in each idle control partition of 10kV power distribution networks, fully excavate the idle output of DG inverters in subregion, reduce idle flowing between each subregion, reactive power is set locally to balance as possible, to reduce power distribution network running wastage.
Description
Technical field
It is the present invention relates to the idle operation method of electric system, more particularly to a kind of inverse based on the power distribution network DG locally measured
Become device power-less optimized controlling method.
Background technology
In the idle control of power distribution network, it is that one kind can be with to carry out centralized optimization control to all DG inverters in power distribution network
Consider the method for global idle resource, after being controlled by centralized optimization, all DG inverters in power distribution network can mutually assist
Allotment is closed, and realizes global optimization and energy saving.But on the one hand centralized optimization control needs to build the power distribution network progress overall situation
On the other hand mould needs to install measuring device to each load bus, leads to two big disadvantages thus：First, communications cost height
It is high, second is that the nonlinear optimal problem of the multiple constraint of demand solution, multivariable, matches in the reality containing numerous DG inverters and wiring complexity
In power grid application, modeling and the difficulty solved are bigger, and the calculating time is also difficult to meet the requirement of real-time online control.
Currently, the DG inverter majorities in power distribution network are equipped with accurate measuring device, communication condition also has substantially,
And DG inverters have idle output potentiality, but at this stage power distribution network is not participated in using DG inverters as reactive source
In idle zonal control.In addition, active distribution network transition stage installation a small number of measuring devices idle subregion locally
It is not fully utilized in balance control.
It is used to fully excavate the idle output energy of DG inverters in power distribution network based on what is locally measured in conclusion proposition is a kind of
The wide area power-less optimized controlling method of power seems particularly necessary.
Invention content
It is an object of the invention to solve the idle capacity of DG inverters in existing power distribution network not obtaining abundant profit
With the problem of, it is desirable to provide a kind of idle partition zone optimizing control method of the real-time online wide area of practicality.
The present invention proposes a kind of based on the power distribution network DG inverter powerless control methods locally measured, includes the following steps：
(1) node that power distribution network is equipped with measuring device is obtained, node of the definition containing measuring device is measurement node；And
Measuring device is required to accurately measure the reactive power for flowing through the node, this reactive power definition be it is idle under give
Amount, value are to send the sum of power under load or burden without work and node of the node are idle；
(2) an idle control partition of wide area is defined as according to the power distribution network between arbitrary two measurement node, from power distribution network
Headend node starts that power distribution network is divided into the idle control partition of n wide area successively so that n wide area is idle, and control partition includes
All load bus of power distribution network and branch, and the idle control partition administrative area of each wide area does not overlap each other, each wide area without
Work(control partition headend node is measurement node；I=1~n is defined, number is referred to as that the idle control partition of wide area of i is idle point
Area i；
(3) in the T dispatching cycle, at the same measure each idle subregion headend node it is idle under the amount of sending be { Q1,
Q2,…,Qn, and then the reactive requirement amount for calculating each idle subregion isCalculate DG inversions in each idle subregion
The total capacity of device is { S1,S2,…,Sn, so that it is determined that in each subregion DG inverters total idle output range；
(4) it is established with the minimum target letter of the quadratic sum of the difference of the idle supply and demand of each subregion according to the idle relation between supply and demand of each subregion
Several DG inverters are idle generating optimization model；
(5) solve above-mentioned Optimized model, according to optimum results determine each DG inverters within dispatching cycle it is fixed it is idle go out
Power setting valve.
It is above-mentioned it is idle under send under the amount of sending, node load or burden without work and node power three relation schematic diagram as shown in Fig. 2,
Respective meaning is respectively：The amount of sending refers specifically to flow through the reactive power size of measuring device under idle, and node load or burden without work is specific
The load or burden without work watt level of busbar institute band where finger joint point send power to refer specifically to from power distribution network head end through measuring device under node
The load power size being conveyed to after present node.
It is above-mentioned according to each idle subregion headend node it is idle under the amount of sending the reactive requirement of each idle subregion is calculated
The method of amount is as follows：
The reactive requirement amount of the idle subregion in power distribution network end is calculated firstAnd then according to recurrence formulaCalculate the reactive requirement amount of i-th of idle subregion
The total capacity computational methods of DG inverters are in above-mentioned each idle subregion：
Wherein SiFor the total capacity of DG inverters in i-th of idle subregion, NiFor DG inverters in i-th of idle subregion
Quantity, SitFor the capacity of t-th of inverter in i-th of idle subregion.
The method of total idle output range of DG inverters is in each idle subregion of above-mentioned determination：
Wherein QGiFor total idle output of DG inverters in i-th of idle subregion,For each DG inverters power because
Number, value according to《Photo-voltaic power generation station accesses power system technology regulation》Identified range is advanced 0.95 to lag
0.95, i.e. QGi∈[-0.31Si,0.31Si] (i=1,2 ..., n).
The idle output of DG inverters of the minimum object function of quadratic sum of the above-mentioned difference with the idle supply and demand of each subregion is excellent
Changing model is：
Object function：
Constraints：
QGi∈[-0.31Si,0.31Si] (i=1,2 ..., n) (4)
Qij+Qji=0i ∈ 1,2 ..., n }, j ∈ 0,1 ..., n } (6)
Wherein φiFor the idle partition number set adjacent with i-th of idle subregion, QijFor j-th of idle subregion conveying
To the idle support power of i-th of idle subregion, particularly, indicate current idle subregion comprising headend node (i.e. when j takes 0
System balancing node), therefore the idle subregion need to additionally consider the reactive power sent under the power grid of upper layer.
The method of fixed idle output setting valve of each DG inverters of above-mentioned determination within dispatching cycle is：
Q is obtained according to optimum resultsGi, t-th of DG inversion in the dispatching cycle in i-th of idle subregion is determined by following formula
Device determines reactive power setting valveFor：
Compared with prior art, the beneficial effects of the present invention are：
(1) the existing idle resource lain in DG inverters of power distribution network is made full use of, so that DG inverters is participated in and matches
During idle subregion in power grid locally balances, measurement and communication system to make full use of the existing power stations DG make distribution
DG in net mutually coordinated sends out idle, idle flowing is reduced, to reduce via net loss；
(2) the idle control partition quantity of wide area divides fewer, then measuring device and the cost of investment of communication equipment are lower,
Be conducive to the power-less optimized controlling method using real-time online in intelligent grid transition stage.
Description of the drawings
Fig. 1 is the flow signal provided by the invention based on the power distribution network DG inverter powerless control methods locally measured
Figure.
Fig. 2 be it is idle under the schematic diagram of power triadic relation is sent under the amount of sending, node load or burden without work and node.
Fig. 3 is IEEE33 Node power distribution system schematic diagrames.
Fig. 4 is the histogram of the fixed idle output setting valve of a power station inverter in example.
Specific implementation mode
The specific implementation of the present invention is described further below in conjunction with attached drawing and example, if it is noted that having below
The process or symbol of not special detailed description are that those skilled in the art are referred to prior art realization or understand.
Fig. 1 reflects the detailed process based on the power distribution network DG inverter powerless control methods locally measured.Based on part
The power distribution network DG inverter powerless control methods of measurement include：
(1) node that power distribution network is equipped with measuring device is obtained, node of the definition containing measuring device is measurement node；And
Measuring device is required to accurately measure the reactive power for flowing through the node, this reactive power definition be it is idle under give
Amount, value are to send the sum of power under load or burden without work and node of the node are idle；
(2) an idle control partition of wide area is defined as according to the power distribution network between arbitrary two measurement node, from power distribution network
Headend node starts that power distribution network is divided into the idle control partition of n wide area successively so that n wide area is idle, and control partition includes
All load bus of power distribution network and branch, and the idle control partition administrative area of each wide area does not overlap each other, each wide area without
Work(control partition headend node is measurement node；I=1~n is defined, number is referred to as that the idle control partition of wide area of i is idle point
Area i；
(3) in the T dispatching cycle, at the same measure each idle subregion headend node it is idle under the amount of sending be { Q1,
Q2,…,Qn, and then the reactive requirement amount for calculating each idle subregion isCalculate DG inversions in each idle subregion
The total capacity of device is { S1,S2,…,Sn, so that it is determined that in each subregion DG inverters total idle output range；
(4) it is established with the minimum target letter of the quadratic sum of the difference of the idle supply and demand of each subregion according to the idle relation between supply and demand of each subregion
Several DG inverters are idle generating optimization model；
(5) solve above-mentioned Optimized model, according to optimum results determine each DG inverters within dispatching cycle it is fixed it is idle go out
Power setting valve.
It is an example of calculation of the method for the present invention below, simulation calculation is carried out by taking IEEE33 Node power distribution systems as an example,
Its interior joint 10,21,23 and 30 is that installed capacity is the photovoltaic plant that 0.75MW, inverter capacity are 0.785MVA, node
13 and 17 be that be 0.75MW, inverter capacity be the wind power station of 0.785MVA, and assume them in one day for installed capacity
Maximum active power output is all 0.75MW, and Fig. 3 shows the topological structure of the power grid.
(1) node of the power distribution network containing measuring device is obtained as shown in figure 3, wherein 1,7 and No. 26 node is equipped with measuring device,
Therefore three above node is known as measurement node, and the reactive power for flowing through the node can be accurately measured within each dispatching cycle；
(2) power distribution network can be divided into according to measurement node by the three big idle subregions of wide area as shown in figure 3, each wide area is without power control
Subregion administrative area processed is specifically as shown in table 1；
1 each wide area of table is idle control partition administrative area
(3) illustrate the proposed idle control of DG inverters by taking the 1st dispatching cycle (the 1st hour in i.e. one day) as an example
Method, then the idle relation between supply and demand in the dispatching cycle of each idle subregion is as shown in table 2；
Idle relation between supply and demand of each idle subregion of table 2 in the 1st dispatching cycle
(4) it is established with the minimum object function of quadratic sum of the difference of the idle supply and demand of each subregion by taking the 1st dispatching cycle as an example
The idle generating optimization model of DG inverters it is as follows：
Object function：
Constraints：
QG1∈[-0.4650,0.4650] (9)
QG2∈[-0.6975,0.6975] (10)
QG3∈[-0.2325,0.2325] (11)
QG1+Q12+Q13+Q10=Q1 (12)
QG2+Q21+Q23=Q2 (13)
QG3+Q31+Q32=Q3 (14)
Q12+Q21=0 (15)
Q13+Q31=0 (16)
Q23+Q32=0 (17)
Wherein Q10Indicate the reactive power that the 1st idle subregion is sent under the power grid of upper layer；
(5) above-mentioned Optimized model is solved, determines each DG inverters within 24 dispatching cycles of whole day according to optimum results
Fixed idle output setting valve, wherein the installed capacity due to each photovoltaic plant and wind power station and inverter capacity all same, therefore phase
It is identical with the fixed idle output setting valve of each DG inverters in idle subregion, therefore select a power station in each idle subregion
It is as shown in Figure 4 that the fixed idle output setting valve of inverter draws histogram.
In order to compare the superiority of the put forward powerless control method of the present invention, by its optimum results and other two kinds of control methods
Result compare as shown in table 3, wherein the 1st kind of control method is the idle subregion of wide area that DG inverters are not involved in power distribution network
Control, the 2nd kind of control method are that DG inverters send out reactive power according to maximum idle output always；
Whole day network loss and the comparison of the whole network average voltage under 3 three kinds of powerless control methods of table
| Network loss (MW) | The whole network average voltage (p.u.) | The whole network minimum voltage (p.u.) | |
| 1st kind of method | 1.97 | 0.9849 | 0.9296 |
| 2nd kind of method | 1.27 | 0.9964 | 0.9426 |
| Context of methods | 1.24 | 0.9956 | 0.9426 |
When as shown in Table 3, using the 1st kind of powerless control method, whole day network loss and voltage condition are inferior to the idle of this paper
Control method, it is seen that the idle resource lain in power distribution network in DG inverters has higher utility value, can greatly reduce
Via net loss；And when using the 2nd kind of powerless control method, whole day network loss is also slightly larger than context of methods, but the average electricity of its whole network
Pressure is high compared with context of methods, and the whole network minimum voltage under two methods is essentially identical.As it can be seen that the idle subregion of the wide area of the present invention is coordinated
Control method can coordinate the idle output size of DG inverters in each idle subregion, so that reactive power in-situ is put down nearby as possible
Weighing apparatus, reduces the long-distance sand transport of reactive power.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other it is any without departing from the present invention Spirit Essences and principle under made by modification, modification, substitute, combination, simplify,
Equivalent substitute mode is should be, should be all included within protection scope of the present invention.
Claims (3)
1. a kind of based on the power distribution network DG inverter powerless control methods locally measured, it is characterised in that include the following steps：
(1) node that power distribution network is equipped with measuring device is obtained, node of the definition containing measuring device is measurement node；And it measures
Device is required to accurately measure the reactive power for flowing through the node, this reactive power definition be it is idle under the amount of sending,
Value is to send the sum of power under load or burden without work and node of the node are idle；
(2) an idle control partition of wide area is defined as according to the power distribution network between arbitrary two measurement node, from power distribution network head end
Node starts that power distribution network is divided into the idle control partition of n wide area successively so that n wide area is idle, and control partition includes distribution
All load bus and branch are netted, and the idle control partition administrative area of each wide area does not overlap each other, each wide area is without power control
Subregion headend node processed is measurement node；I=1~n is defined, number is referred to as that the idle control partition of wide area of i is idle subregion i；
(3) in the T dispatching cycle, at the same measure each idle subregion headend node it is idle under the amount of sending be { Q1,Q2,…,
Qn, and then the reactive requirement amount for calculating each idle subregion isCalculate the total of DG inverters in each idle subregion
Capacity is { S1,S2,…,Sn, so that it is determined that in each subregion DG inverters total idle output range；
(4) it is established with the minimum object function of quadratic sum of the difference of the idle supply and demand of each subregion according to the idle relation between supply and demand of each subregion
DG inverters are idle generating optimization model；
(5) above-mentioned Optimized model is solved, determines that fixed idle output of each DG inverters within dispatching cycle is whole according to optimum results
Definite value.
2. according to claim 1 based on the power distribution network DG inverter powerless control methods locally measured, it is characterised in that：
Step 3) it is described according to each idle subregion headend node it is idle under the amount of sending the reactive requirement amount of each idle subregion is calculated
Method is as follows：
The reactive requirement amount of the idle subregion in power distribution network end is calculated firstAnd then according to recurrence formulaCalculate the reactive requirement amount of i-th of idle subregion
The total capacity computational methods of DG inverters are in each idle subregion：
Wherein SiFor the total capacity of DG inverters in i-th of idle subregion, NiFor the quantity of DG inverters in i-th of idle subregion,
SitFor the capacity of t-th of inverter in i-th of idle subregion；
The method of total idle output range of DG inverters is in each idle subregion of the determination：
Wherein QGiFor total idle output of DG inverters in i-th of idle subregion,For the power factor of each DG inverters,
Value according to《Photo-voltaic power generation station accesses power system technology regulation》(GB/T19964-2012) range determined by is advanced
0.95 to lag 0.95, i.e. QGi∈[-0.31Si,0.31Si] (i=1,2 ..., n).
3. according to claim 1 based on the power distribution network DG inverter powerless control methods locally measured, it is characterised in that：
The idle generating optimization of DG inverters of the minimum object function of quadratic sum of the difference with the idle supply and demand of each subregion described in step 4)
Model is：
Object function：
Constraints：
QGi∈[-0.31Si,0.31Si] (i=1,2 ..., n) (4)
Qij+Qji=0 i ∈ 1,2 ..., n }, j ∈ 0,1 ..., n } (6)
Wherein φiFor the idle partition number set adjacent with i-th of idle subregion, QijIt is conveyed to i-th for j-th of idle subregion
The idle support power of a idle subregion particularly indicates that current idle subregion is flat comprising headend node i.e. system when j takes 0
Weigh node, therefore the idle subregion need to additionally consider the reactive power sent under the power grid of upper layer.
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