CN104283217B - Method for judging operation interval of power distribution network comprising distributed power supply and microgrid - Google Patents

Abstract

The invention discloses a method for judging running intervals of a power distribution network comprising a distributed power supply and a microgrid, which is characterized in that the running intervals of the power distribution network are gradually refined layer by layer according to the importance degree of decision attributes, so that the running intervals of the power distribution network have the characteristics of mutual non-overlapping and parallel full-coverage working conditions. The method and the device perform operation interval judgment on the power distribution network containing the distributed power supply and the micro-grid according to the importance degree of the decision attribute, and conveniently and quickly divide the state of the power distribution network.

Description

Power distribution network traffic coverage decision method containing distributed power source and micro-capacitance sensor

Technical field

The present invention relates to power distribution network traffic coverage judges field, contain distributed power source and micro- electricity in particular to a kind of The power distribution network traffic coverage decision method of net.

Background technology

With going deep into of intelligent grid research, after distributed power source accesses power distribution network, power distribution network is progressively from passive-type distribution Net is transited into as active power distribution network, and distribution network automated technology has also correspondingly developed into the self-healing control stage.For distribution The different traffic coverages of net, self-healing control has different control targes.Intelligent distribution network traffic coverage is carried out scientific and reasonable Division is the primary condition realizing power distribution network spontaneous recovery.

Because self-healing distribution network and traditional electrical network realize the different of function and the method for operation, in interval judgment basis and The aspects such as the control measure between various traffic coverage scopes have very big difference, can not be according to original operation of power networks Interval decision method is divided.Meanwhile, research in terms of operation for the active power distribution network is at the early-stage, not complete set Power distribution network traffic coverage decision scheme, be extremely unfavorable for power distribution network self-healing control technology research expansion.It is therefore proposed that one The new method that kind is adapted to the power distribution network traffic coverage judgement containing distributed power source and micro-capacitance sensor is necessary.

Content of the invention

For these reasons, present invention incorporates the feature of power distribution network self-healing control, provide a kind of containing distributed power source with The power distribution network traffic coverage decision method of micro-capacitance sensor.

The present invention solves technical problem and be the technical scheme is that a kind of power distribution network containing distributed power source and micro-capacitance sensor Traffic coverage decision method it is characterised in that according to decision attribute significance level successively gradually refinement distribution Operational Zone Between so that each traffic coverage of power distribution network have do not overlap each other and mutually and all standing operating mode characteristic.

The significance level of described decision attribute is reliable with power distribution network external stability, power distribution network internal stability, power distribution network Property, the order arrangement of power distribution network integrity and power distribution network economy.

Described power distribution network external stability decision attribute, whether distribution network operation subregion is run with Major Networks with and is divided into Small-sized island network traffic coverage and Major Networks traffic coverage two class.

Described power distribution network internal stability decision attribute, whether distribution network operation subregion maintains with power distribution network isolated operation Stablize and be divided between normal working zone and off-the-line traffic coverage two class.

Described distribution network reliability decision attribute, distribution network operation subregion passes through fault, electrically out-of-limit and electric early warning Three reliability indexs successively divide.

Described fault indices, distribution network operation subregion to be divided into faulty traffic coverage, fault-free with the presence or absence of fault Traffic coverage and risky traffic coverage.By positioning and the isolation of fault, after turn confession in non-faulting area, distribution is transformed into without reason Can barrier state, all turn confession according to non-faulting area load, and failure operation interval can be divided into catastrophe failure traffic coverage and common Failure operation is interval.

Described electrically out-of-limit index, distribution network operation subregion is divided into out-of-limit Operational Zone using formula (2) as decision condition Between, no out-of-limit traffic coverage.

$\left\{\begin{array}{c}0.9p.u.\≤v\≤1.1p.u.\\ s\≤s_{\max }\\ {\mathrm{thd}}_h\≤{\mathrm{thd}}_{h\max }\\ {\mathrm{thd}}_i\≤{\mathrm{thd}}_{i\max }\end{array}\right.---\left(2\right)$

Described warning index, distribution network operation subregion is divided into out-of-limit traffic coverage, no using formula (3) as decision condition Out-of-limit traffic coverage.

$\left\{\begin{array}{c}v\&element;[k_1\·0.9p.u.,0.9p.u.]\∪[k_2\·1.1p.u.,1.1p.u.]\\ s\≤k_3\·s_{\max }\\ {\mathrm{thd}}_h\≤k_4\·{\mathrm{thd}}_{h\max }\\ {\mathrm{thd}}_i\≤k_5\·{\mathrm{thd}}_{i\max }\end{array}\right.---\left(3\right).$

Described power distribution network integrity decision attribute, distribution network operation subregion is so that, after fault recovery, whether electrical network is with original Topological structure run and be divided into the interval and topological imperfect traffic coverage of topological entire run.

Described power distribution network economic decision attribute, distribution network operation subregion is divided into whether meeting the judgement of formula (1) Optimized operation zone and non-economy traffic coverage.

$w\≤k_w\·\min (\underset{k=1}{\overset{n_l}{\mathrm{\σ}}}{r}_k\·\frac{p_k^2+q_k^2}{u_k^2}+\underset{i=1}{\overset{n_s}{\mathrm{\σ}}}{c}_i)---\left(1\right).$

According to the invention described above, the present invention that what it was beneficial have the technical effect that a kind of based on decision tree containing distributed power source With the power distribution network traffic coverage decision method of micro-capacitance sensor, according to decision attribute significance level successively gradually refinement distribution fortune Row is interval, each traffic coverage of power distribution network have do not overlap each other and mutually and all standing operating mode characteristic, fast and easy is to electricity Net state is divided.The present invention is with power distribution network external stability, power distribution network internal stability, distribution network reliability, power distribution network The order of integrity and power distribution network economy carries out traffic coverage division to power distribution network, contains distributed power source and micro-capacitance sensor the most at last Power distribution network be divided into 21 traffic coverages by different operating modes.

Brief description

Fig. 1 contains distributed power source for the present invention and divides decision tree diagram with the power distribution network traffic coverage of micro-capacitance sensor.

Specific embodiment

The power distribution network interval decision method containing distributed power source and micro-capacitance sensor of 1 couple of present invention is said below in conjunction with the accompanying drawings Bright.

A kind of power distribution network traffic coverage decision method containing distributed power source and micro-capacitance sensor of the present invention, by the weight of decision attribute Degree is wanted to carry out traffic coverage judgement to the power distribution network containing distributed power source and micro-capacitance sensor, fast and easy carries out to electric network state drawing Point.

Distribution network operation, as first order decision attribute, can be divided into and Major Networks traffic coverage and little by external stability Type island network traffic coverage two big class.Wherein, small-sized island network state refers to break down or electric energy matter in outside major network Amount is when being unsatisfactory for burden requirement, with major network off-the-line and the isolated operation pattern that formed.Secondly, consider emphatically with major network off-the-line after electricity Small-sized island network traffic coverage, using internal stability as second level decision attribute, can be divided into by the stability of network operation again With off-the-line traffic coverage between normal working zone.Wherein, off-the-line traffic coverage (state 11) refers to occur sternly in small-sized island network Weight fault can not maintain off-the-line again that is stable and occurring.

After being divided by stability, the traffic coverage of power distribution network can be continued using reliability as third level policy attribute again Continuous division.For influence degree and time serieses angle, reliability index can be divided into fault, electrically out-of-limit and electric early warning Three parts.Progressive by these three indexs, the traffic coverage of power distribution network is segmented.

1) reliability failure index

Power distribution network traffic coverage can be divided into fault-free, faulty and risky three class situations by reliability failure index. Wherein, faulty traffic coverage refers to that power distribution network is short-circuited a series of harm such as fault, singlephase earth fault and disconnection fault The normal situation about running of distribution.After fault occurs, by positioning and the isolation of fault, after turn confession in non-faulting area, distribution turns Change to unfaulty conditions, can confession be all turned according to non-faulting area load, failure operation interval can be divided into catastrophe failure Operational Zone Between (state 7, state 18) and ordinary failures traffic coverage (state 6, state 17).But because power distribution network operating mode is more complicated, Outside fault-free and faulty situation, it is possible that monitoring device abnormal (as three-phase imbalance, harmonic wave increase etc.) but fault is fixed The indefinite phenomenon in position, this shows that system has the risk breaking down, and that is, power distribution network is in risky traffic coverage.

2) the out-of-limit index of reliability

In the failure-free operation of power distribution network is interval, system failure generation but have electrically out-of-limit risk, therefore with The out-of-limit index of reliability is that failure-free operation interval can be continued to be subdivided into no out-of-limit traffic coverage and out-of-limit traffic coverage by reference (state 1,

10th, 21) two classes.Formula (1) gives the judgement of the no out-of-limit traffic coverage of power distribution network, for being unsatisfactory for formula (1) Traffic coverage be then divided to out-of-limit traffic coverage.

$\left\{\begin{array}{c}0.9p.u.\≤v\≤1.1p.u.\\ s\≤s_{\max }\\ {\mathrm{thd}}_h\≤{\mathrm{thd}}_{h\max }\\ {\mathrm{thd}}_i\≤{\mathrm{thd}}_{i\max }\end{array}\right.---\left(1\right)$

Wherein, s is equipment, the actual capacity of circuit；s_maxMaximum size for equipment, circuit；thd_hFor the total harmonic wave of voltage Aberration rate；thd_hmaxFor the voltage total harmonic distortion factor upper limit；thd_iFor current total harmonic distortion rate；thd_imaxFor current total harmonic The aberration rate upper limit.

3) reliability warning index

In the no out-of-limit traffic coverage of power distribution network, introduce reliability warning index by have the traffic coverage of out-of-limit risk with The traffic coverage of no out-of-limit risk distinguishes, and is formed with early warning power distribution network traffic coverage (state 2,9,13,20) and joins with no early warning Operation of power networks is interval, and specific early warning judges shown in section definition such as formula (2), wherein k₁:k₅For vigilance parameter, span It is between 0:1.

$\left\{\begin{array}{c}v\&element;[k_1\·0.9p.u.,0.9p.u.]\∪[k_2\·1.1p.u.,1.1p.u.]\\ s\≤k_3\·s_{\max }\\ {\mathrm{thd}}_h\≤k_4\·{\mathrm{thd}}_{h\max }\\ {\mathrm{thd}}_i\≤k_5\·{\mathrm{thd}}_{i\max }\end{array}\right.---\left(2\right)$

After before carrying out, three-level decision attribute judges, for fully meeting the traffic coverage of stability and reliability to ensure The integrity of distribution framework continues refinement interval as fourth stage property policy, is divided into topological entire run interval not complete with topology Whole traffic coverage (state 3,14).Wherein, topological entire run interval refers to the load during fault recovery, being cut off Again recover, the state that electrical network is still run with original topological structure.If the branch road of excision cannot recover in fault, electrical network can not Run with original topological structure, then referred to as topological imperfect traffic coverage.

Finally, it is considered to the economy of power distribution network traffic coverage is special on the basis of meeting stability, reliability and integrity Property, propose with economy for level V policy attribute, by system operation interval be divided into optimized operation zone (state 5,16) with non- Optimized operation zone (state 4,15).Wherein, shown in the judgement of economical operation such as formula (3).

$w\≤k_w\·\min (\underset{k=1}{\overset{n_l}{\mathrm{\σ}}}{r}_k\·\frac{p_k^2+q_k^2}{u_k^2}+\underset{i=1}{\overset{n_s}{\mathrm{\σ}}}{c}_i)---\left(3\right)$

Wherein, w is the economic attrition of power distribution network under this operating mode；k_wFor economic adjustment coefficient, general value is more than 1；n_lFor being The branch road sum of system；p_k、q_kAnd u_kIt is respectively the resistance of a certain moment kth bar branch road, active, idle and first section voltage；c_iFor The operating cost of i switch；n_sFor there being the switch of operation.

Claims (5)

1. a kind of power distribution network traffic coverage decision method containing distributed power source and micro-capacitance sensor is it is characterised in that belong to according to decision-making Property significance level successively refinement distribution gradually traffic coverage so that each traffic coverage of power distribution network has mutually does not weigh Folded and mutually and all standing operating mode characteristic, the significance level of described decision attribute with power distribution network external stability, power distribution network inside Stability, the order arrangement of distribution network reliability, power distribution network integrity and power distribution network economy；

Described power distribution network external stability decision attribute, whether distribution network operation subregion is run with Major Networks with and is divided into small-sized Island network traffic coverage and Major Networks traffic coverage two class；

Described power distribution network internal stability decision attribute, whether distribution network operation subregion is to remain stable under power distribution network isolated operation And be divided between normal working zone and off-the-line traffic coverage two class；

Described distribution network reliability decision attribute, distribution network operation subregion passes through fault, electrically out-of-limit and electric early warning three Reliability index successively divides；

Fault indices, distribution network operation subregion to be divided into faulty traffic coverage, failure-free operation interval with the presence or absence of fault With risky traffic coverage.

2. the power distribution network traffic coverage decision method containing distributed power source and micro-capacitance sensor according to claim 1, its feature It is, described power distribution network integrity decision attribute, distribution network operation subregion is so that, after fault recovery, whether electrical network is opened up with original Flutter structure to run and be divided into the interval and topological imperfect traffic coverage of topological entire run.

3. the power distribution network traffic coverage decision method containing distributed power source and micro-capacitance sensor according to claim 1, its feature It is, described power distribution network economic decision attribute, whether distribution network operation subregion is to meet the judgement of formula (1) and to be divided into economy Traffic coverage and non-economy traffic coverage,

$w\≤k_w\·min(\underset{k=1}{\overset{n_l}{\σ}}{r}_k\·\frac{p_k^2+q_k^2}{u_k^2}+\underset{i=1}{\overset{n_s}{\σ}}{c}_i)---\left(1\right).$

4. the power distribution network traffic coverage decision method containing distributed power source and micro-capacitance sensor according to claim 1, its feature It is, electrically out-of-limit index, distribution network operation subregion is divided into out-of-limit traffic coverage, is no got over using formula (2) as decision condition Limit traffic coverage,

$\left\{\begin{array}{c}0.9p.u.\≤v\≤1.1p.u.\\ s\≤s_{max}\\ {\mathrm{thd}}_h\≤{\mathrm{thd}}_{h\max }\\ {\mathrm{thd}}_i\≤{\mathrm{thd}}_{imax}\end{array}\right.---\left(2\right).$

5. the power distribution network traffic coverage decision method containing distributed power source and micro-capacitance sensor according to claim 1, its feature It is, warning index, distribution network operation subregion is divided into out-of-limit traffic coverage, no out-of-limit fortune using formula (3) as decision condition Row is interval,

$\left\{\begin{array}{c}v\&element;\[k_1\·0.9p.u.,0.9p.u.\]\∪\[k_1\·1.1p.u.,1.1p.u.\]\\ s\≤k_3\·s_{\max }\\ {\mathrm{thd}}_h\≤k_4\·{\mathrm{thd}}_{h\max }\\ {\mathrm{thd}}_i\≤k_5\·{\mathrm{thd}}_{i\max }\end{array}\right.---\left(3\right).$