CN103401237B - A kind of distribution method according to each node voltage of multistage pressure long-distance cable circuit - Google Patents
A kind of distribution method according to each node voltage of multistage pressure long-distance cable circuit Download PDFInfo
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- CN103401237B CN103401237B CN201310324461.XA CN201310324461A CN103401237B CN 103401237 B CN103401237 B CN 103401237B CN 201310324461 A CN201310324461 A CN 201310324461A CN 103401237 B CN103401237 B CN 103401237B
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Abstract
The present invention relates to distribution technique field, the invention discloses a kind of distribution method according to each node voltage of multistage pressure long-distance cable circuit, it specifically comprises the following steps: step 1. is according to the top voltage of step down side
set the magnitude of voltage of each node
, step 2. calculate each node revise at the 1st time after the magnitude of voltage that obtains and the difference not having between corrected magnitude of voltage
, judge whether maximum difference is less than or equal to the difference threshold of setting
; Be, then by revised each node voltage value
store backed off after random; Until difference between the magnitude of voltage of corresponding node that obtains after revising for-1 time of the magnitude of voltage of all nodes obtained after kth time is revised and kth
be less than or equal to the difference threshold of setting
, then by revised each node voltage value
store backed off after random.Determine the voltage of each node according to the actual power of end, and carry out distribution according to the magnitude of voltage of each node, the needs of the realistic engineering of such distribution method, have better reliability.
Description
Technical field
The present invention relates to distribution technique field, particularly relate to a kind of distribution method according to each node voltage of multistage pressure long-distance cable circuit.
Background technology
Generally traditionally electric power system is divided into generating, transmission and disttrbution three digest journals.The electric energy that electricity generation system sends, via the conveying of transmission system, finally distributes to each user by distribution system.Usually, this section of system exporting to user side from step-down distribution transformer station (High Voltage Distribution Substations) in electric power system is called distribution system.The voltage of transformation that distribution system is made up of multiple controller switching equipment (or element) and distribution facility and distribute an electric power networks system of electric energy directly to terminal use.In long distance electric system, traditional distribution method obtains each node voltage according to high-tension cable TLM transmission line matrix computation model, then carries out distribution according to each node voltage.Its high-tension cable TLM transmission line matrix computation model is based upon on geometric distance between transmission line dielectric character, cross-sectional area of conductor, conductor basis identical everywhere.But in Practical Project, the ampacity that Voltage Cable Lines Construction is concrete needs to determine according to the actual conditions of engineering, different installation geographical conditions, the factors such as the inhomogeneities that different system of layings and conductor itself exist, all can have a certain impact to the ampacity of high-tension cable.Thus cause computation model inaccurate, affect the accuracy of final distribution method.
Summary of the invention
Goal of the invention of the present invention is: be all the distribution under the situation of fixing based on transmission line for distribution method of the prior art, its result and actual difference larger, the technical problem that the degree of accuracy of distribution is not high, provides a kind of distribution method according to each node voltage of multistage pressure long-distance cable circuit.
The technical solution used in the present invention is such:
According to a distribution method for each node voltage of multistage pressure long-distance cable circuit, it specifically comprises the following steps: step 1. is according to the top voltage of step down side
set the magnitude of voltage of each node
, according to the magnitude of voltage of each node of setting
with the injecting power of endpoint node, calculate the correction voltage value of each node
; Wherein i is 1,2,3 ..., any one in n, represents the magnitude of voltage of upwards several i-th node from endpoint node, and subscript 0 represents do not have corrected magnitude of voltage, and subscript 1 represents the 1st revised magnitude of voltage; Step 2. calculate each node revise at the 1st time after the magnitude of voltage that obtains and the difference not having between corrected magnitude of voltage
, judge whether maximum difference is less than or equal to the difference threshold of setting
; Be, then by revised each node voltage value
store backed off after random; Otherwise continue step 3; The magnitude of voltage of each node of setting increases by step 3., then judges whether the magnitude of voltage of each node after increasing is greater than or equal to the maximum of each node voltage permission, is exit; Otherwise take the magnitude of voltage of each node after increase as the magnitude of voltage of each node of setting, repeat step 1 and 2, proceed to revise, until the maximum difference between the magnitude of voltage of corresponding node that obtains after revising for-1 time of the magnitude of voltage of all nodes obtained after kth time is revised and kth
be less than or equal to the difference threshold of setting
, then by revised each node voltage value
store backed off after random; Step 4. is according to revised each node voltage value of preserving
carry out distribution.
Further, above-mentioned steps 1 is specially: according to the magnitude of voltage of the endpoint node of setting
the injecting power known with endpoint node calculates the current value of endpoint node, then calculates the current value on the first corresponding main road according to the current value of endpoint node and the current value of all branch roads directly connected with endpoint node
, finally calculate the correction voltage value of a upper node according to the current value on the magnitude of voltage of endpoint node setting and the first main road, the like, until obtain the 1st revised top magnitude of voltage.
Further, the above-mentioned top voltage according to step down side
set the magnitude of voltage of each node
be specially
, wherein
for the initial setting magnitude of voltage of each node,
for the top voltage of step down side.
Further, the maximum that above-mentioned each node voltage allows is specially
.
Further, the above-mentioned magnitude of voltage of each node by setting carries out increasing the node voltage value being specially each setting and adds 1.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows: the voltage determining each node according to the actual power of end, and carry out distribution according to the magnitude of voltage of each node, the needs of the realistic engineering of such distribution method, have better reliability.Push back the method in generation simultaneously before adopting, programming is simple, computational speed is fast, convergence can be able to adjust according to the different threshold value of setting, flexibility is high, is more suitable for distribution power system load flow calculation.
Accompanying drawing explanation
Fig. 1 is distribution system structural equivalents circuit diagram.
Fig. 2 is the distribution method according to each node voltage of multistage pressure long-distance cable circuit of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with Figure of description and specific embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
For the distribution system in Fig. 1 according to the distribution method of each node voltage of multistage pressure long-distance cable circuit in the present invention.The structural representation of distribution system as shown in Figure 1, voltage and the top voltage of step down side are
, after main road transmission, carrying out branch, be divided into n+1 branch road, its node voltage is
, wherein n branch road connects load respectively, and (n+1)th branch road is after the transmission of its main road, and be divided into again n+1 branch road, its node voltage is
, wherein n branch road connects load respectively, and (n+1)th branch road, after the transmission of its main road, is divided into again n+1 branch road, the like, finally all branch roads all connect load, and last endpoint node voltage is
.
Formula of the present invention does following explanation: the subscript 0,1,2 in the present invention ..., k, 0 expression is not also revised, i.e. the node voltage of initial setting, and 1 represents the 1st revised node voltage ..., k represents kth time revised node voltage.
The present invention is as shown in Figure 2 according to the distribution method of each node voltage of multistage pressure long-distance cable circuit.The invention discloses a kind of distribution method according to each node voltage of multistage pressure long-distance cable circuit, it specifically comprises the following steps: step 1. is according to top voltage
set the magnitude of voltage of each node
, wherein subscript 0 represents and does not also revise, and subscript i is 1,2,3 ..., any one in n, represents the magnitude of voltage of i-th node upwards counted from endpoint node, according to the magnitude of voltage of each node of setting
with the injecting power of endpoint node, carry out the 1st time and revise, obtain the magnitude of voltage of the 1st revised each node
; Wherein top voltage is the voltage of step down side.
Step 1 is specially: according to the magnitude of voltage of the endpoint node of setting
the injecting power known with endpoint node calculates the current value of endpoint node; Such as can first set endpoint node voltage
for top voltage
90%, according to definition of the present invention, set in the present invention
, according to engineering experience, endpoint node voltage
for top voltage
90% be lower limit, be the normal start-up and operation of guaranteed load, end load voltage is minimum can not be less than 90% of top voltage, equivalent circuit diagram as shown in Figure 1, is exactly basis
determine elder generation
extremely
, the initial voltage that wherein can set each node is identical, such as
, i is 1,2,3 ..., any one in n, also can arrange different initial voltage value according to the position of node, and it can carry out very many selections as required, is not repeating at this.Then according to the injecting power of known endpoint node
calculate the electric current of endpoint node
, namely
.The current value on the first corresponding main road is calculated again according to the current value of endpoint node and the current value of all branch roads directly connected with endpoint node
.Equivalent circuit diagram as shown in Figure 1, the i.e. current value of endpoint node
with the current value on each branch road
sum equals the first main road electric current that each branch road and endpoint node are linked to be
, wherein i=1,2 ..., n-1.The account form of the current value on each branch road is identical with above-mentioned steps, and at this, it is no longer repeated.The last magnitude of voltage according to endpoint node setting and the first main road current value calculate a upper node voltage value.Equivalent circuit diagram as shown in Figure 1, namely according to endpoint node voltage
with the first main road current value
calculate a node voltage value
,
.Each endpoint node the like, calculate the node voltage that each node obtains after first time is revised
,
light the magnitude of voltage of i-th node from end segment after referring to first time correction,
refer to the top magnitude of voltage obtained after must revising for the 1st time.
Step 2. calculates the difference between magnitude of voltage and the magnitude of voltage of setting obtained after each node is revised at the 1st time, namely
, judge whether the maximum difference of all nodes is less than or equal to the threshold value of setting, is, then by revised each node voltage value
store backed off after random; Otherwise the magnitude of voltage of each node of setting is adjusted, such as the magnitude of voltage of each node of setting is added 1 or add other values set, or carry out other change, such as be set as 91% of top voltage etc., like this, various setting can be carried out as required, make the precision of getting more suitable in a word.Then judge whether the voltage of each node after adjusting is greater than or equal to 110% of top voltage, is exit.If maximum difference is greater than the threshold value of setting and the voltage of the rear each node of adjustment is less than 110% of top voltage, then repeat above-mentioned steps, proceed the 2nd time and revise.
Step 3, calculates the difference between the magnitude of voltage of each node after revising for the 2nd time and the magnitude of voltage revising afterwards each node for the 1st time, judges whether the maximum difference of all nodes is less than the threshold value of setting, is, then by revised each node voltage value
store backed off after random; Otherwise the magnitude of voltage of each node of setting is adjusted, such as the magnitude of voltage of each node of setting is added 1 or add other values set, or carry out other change, such as be set as 91% of top voltage etc., like this, various setting can be carried out as required, make the precision of getting more suitable.Then judge whether the voltage of each node after adjusting is greater than or equal to 110% of top voltage, is exit.If maximum difference is greater than the threshold value of setting and the voltage of the rear each node of adjustment is less than 110% of top voltage, then repeat step 1, proceed the 2nd time and revise.Otherwise repeat step 1, proceed the 3rd time and revise.
Step 4. the like, after carrying out the secondary correction of kth, the magnitude of voltage of the rear each node of calculating kth time correction and kth revise the difference between the magnitude of voltage value of rear each node for-1 time, judge that maximum difference is the threshold value being less than setting, then revised each node voltage value is preserved; Otherwise the magnitude of voltage of each node of setting is added 1, and continues to judge whether the voltage of endpoint node is greater than or equal to 110% of top voltage, is exit, otherwise repeat step 1, proceed kth and revise for+1 time.Until all nodes last time revise threshold value that the magnitude of voltage that obtains and this maximum difference revising the magnitude of voltage obtained be less than or equal to setting then just revised each node voltage value store backed off after random.If endpoint node voltage is greater than or equal to 110% of top voltage adding after 1, then exits, rethink distribution method.Step 5. determines that according to step 4 magnitude of voltage of each node preserved carries out distribution.
If still undesirable after revising, then rethink distribution method after needing to exit, because terminal voltage is undesirable, if brownout, soft-start cabinet can be added on the spot, or increase the cross-section of cable; If overtension, then can add high voltage reactor in parallel, absorbing reactive power, reduce terminal voltage.Adjust by increasing hardware device above, terminal voltage is met the requirements prescribed, and this content does not belong to key content of the present invention, no longer repeats at this.
Coefficient given in the above embodiments and parameter; be available to those skilled in the art to realize or use of the present invention; the present invention does not limit and only gets aforementioned disclosed numerical value; without departing from the present invention in the case of the inventive idea; those skilled in the art can make various modifications or adjustment to above-described embodiment; thus protection scope of the present invention not limit by above-described embodiment, and should be the maximum magnitude meeting the inventive features that claims are mentioned.
Claims (3)
1., according to a distribution method for each node voltage of multistage pressure long-distance cable circuit, it specifically comprises the following steps:
Step 1. is according to the top voltage of step down side
set the magnitude of voltage of each node
, according to the magnitude of voltage of each node of setting
with the injecting power of endpoint node, calculate the correction voltage value of each node
; Wherein i is 1,2,3 ..., any one in n, represents the magnitude of voltage of upwards several i-th node from endpoint node, and subscript 0 represents do not have corrected magnitude of voltage, and subscript 1 represents the 1st revised magnitude of voltage;
Step 2. calculate each node revise at the 1st time after the magnitude of voltage that obtains and the difference not having between corrected magnitude of voltage
, judge whether maximum difference is less than or equal to the difference threshold of setting
; Be, then by revised each node voltage value
store backed off after random; Otherwise continue step 3;
The magnitude of voltage of each node of setting increases by step 3., then judges whether the magnitude of voltage of each node after increasing is greater than or equal to the maximum of each node voltage permission, is exit; Otherwise take the magnitude of voltage of each node after increase as the magnitude of voltage of each node of setting, repeat step 1 and 2, proceed to revise, until maximum difference between the magnitude of voltage of corresponding node that obtains after revising for-1 time of the magnitude of voltage of all nodes obtained after kth time is revised and kth
be less than or equal to the difference threshold of setting
, then by revised each node voltage value
store backed off after random;
Step 4. is according to revised each node voltage value of preserving
carry out distribution;
Described step 1 is specially: according to the magnitude of voltage of the endpoint node of setting
calculate the current value of endpoint node with the injecting power of endpoint node, then calculate the current value on the first corresponding main road according to the current value of endpoint node and the current value of all branch roads directly connected with endpoint node
, finally calculate the correction voltage value of a upper node according to the current value on the magnitude of voltage of endpoint node setting and the first main road, the like, until obtain the 1st revised top magnitude of voltage.
2., as claimed in claim 1 according to the distribution method of each node voltage of multistage pressure long-distance cable circuit, it is characterized in that the described top voltage according to step down side
set the magnitude of voltage of each node
be specially
, wherein
for the initial setting magnitude of voltage of each node,
for the top voltage of step down side.
3., as claimed in claim 2 according to the distribution method of each node voltage of multistage pressure long-distance cable circuit, it is characterized in that the maximum that described each node voltage allows is specially
.
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Address after: 610021 Dongfeng Road, Chengdu, Sichuan, No. 18, No. Applicant after: China Power Engineering Consulting Group Southwest Electric Power Design Institute Co., Ltd. Address before: 610021 Dongfeng Road, Chengdu, Sichuan, No. 18, No. Applicant before: Southwest Electric Power Design Institute of China Power Engineering Consulting Group Corporation |
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Inventor after: Ding Wei Inventor after: Hu Zhenxing Inventor after: Qi Chun Inventor after: Yang Yiwei Inventor before: Ding Wei |
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