CN103401270A - Method and device for determining accepting ability of medium and lower voltage distribution network to distributed power sources - Google Patents
Method and device for determining accepting ability of medium and lower voltage distribution network to distributed power sources Download PDFInfo
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Abstract
The application discloses a method for determining accepting ability of a medium and lower voltage distribution network to distributed power sources. The method comprises the following steps: determining an installed capacity of each distributed power source in each category distribution network according to a current permitted permeability; calculating node voltage and/or short-circuit current according to the installed capacities, and then performing checking; when the node voltage and/or the short-circuit current is larger than a preset threshold, determining whether a difference value between a current permitted permeability and a former permitted permeability is in a default range or not, if not, updating current permitted permeability in low direction, and if yes, updating current permitted permeability in high direction; when the node voltage and/or the short-circuit current is not larger than the preset threshold, updating current permitted permeability in high direction, using the updated current permitted permeability as a new permitted permeability, and then returning the step for determining the installed capacity; determining the accepting ability of the medium and lower voltage distribution network to the distributed power sources according to final permitted permeability. The application further discloses a device for determining the accepting ability of the medium and lower voltage distribution network to the distributed power sources. According to the application, an actual situation of the access capability of the distributed power sources can be accurately reflected.
Description
Technical field
The application relates to the power system analysis technical field, and particularly a kind of definite low and medium voltage distribution network is admitted method and the corresponding device thereof of distributed electrical source capability.
Background technology
In order to alleviate the power shortage situation to load, a kind of effective mode is to access distributed power source in existing low and medium voltage distribution network, distributed power source by the access low and medium voltage distribution network is directly powered to load, realize the electric energy on-site elimination, this mode is conducive to alleviate the trend in power distribution network, reduce grid loss, improve the power supply reliability of responsible consumer, solve the supply of electric power problem in the remote areas such as rural area or isolated island.But,, because the access of distributed power source has changed original single, the radial network connection form of low and medium voltage distribution network, increased the complexity of power distribution network scheduling with operational management.And, when the installed capacity of Distributed Generation in Distribution System access surpasses certain limit, will produce many adverse effects to safe operation and the reliable power supply of electrical network, such as the phenomenons such as voltage deviation, voltage flash, harmonic wave, protection malfunction occurring.Therefore, need badly and admit the ability of distributed power source to study to low and medium voltage distribution network, accurately determine the ability of low and medium voltage distribution network admittance distributed power source, with safety, the reliability service of guaranteeing distributed power source and electrical network.
The method that prior art adopts data to check is usually determined low and medium voltage distribution network admittance distributed electrical source capability, but, this method has limitation: on the one hand, there is complicated and diversified shortcoming in the check criterion that data are checked foundation, and along with power system technology and Form Development, part is checked criterion and no longer can be adapted to low and medium voltage distribution network, such as, one of check judgement of prior art power supply climbing rate; On the other hand, the check of prior art judgement all is used for completing data coequally checks, and partly check criterion, to determining power distribution network, admits the effect of distributed electrical source capability less, is not to need the emphasis limiting factor of considering, such as, the impact of harmonic wave.This shows, prior art is when determining that low and medium voltage distribution network is admitted the ability of distributed power source,, due to the check criterion that adopts outdated or non-emphasis to consider, with being difficult to, the ability of the admittance to distributed power source of determining accurately reflects the actual conditions that distributed power source accesses.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of method and device of determining middle electric design admittance distributed electrical source capability, to reflect exactly low and medium voltage distribution network, admits the ability of distributed power source.
Definite low and medium voltage distribution network that the application provides admits the method for distributed electrical source capability to comprise:
Determine the installed capacity of each distributed power source according to current allowance permeability, described allowance permeability is to allow under the prerequisite that ensures electric power netting safe running and reliable power supply to the maximum distribution formula power supply installed capacity of low and medium voltage distribution network access and the ratio of low and medium voltage distribution network power supply peak load;
Node voltage and/or short circuit current according to each Nodes of the low and medium voltage distribution network of the installed capacity of distributed power source access Computation distribution formula power supply;
Node voltage and/or short circuit current to each node are checked: when the node voltage of each node and/or short circuit current during greater than predeterminated voltage threshold values and/or predetermined current threshold values, judge that the difference of current allowance permeability and previous allowance permeability is whether in preset range, if not, to low direction, upgrade described current allowance permeability, if so, with current allowance permeability as final allowance permeability; When the node voltage of each node and/or short circuit current are not more than predeterminated voltage threshold values and/or predetermined current threshold values, to high direction, upgrade described current allowance permeability; Allowance permeability after upgrading, as new current allowance permeability, is returned to the step of determining the installed capacity of each distributed power source according to current allowance permeability;
Determine the ability of low and medium voltage distribution network admittance distributed power source according to final allowance permeability.
Preferably, describedly upgrade described current allowance permeability to high direction and comprise:
Ask for the mean value of current allowance permeability and previous larger allowance permeability, with this mean value, upgrade current allowance permeability;
Describedly upgrade described current allowance permeability to low direction and comprise:
Ask for the mean value of current allowance permeability and previous less allowance permeability, with this mean value, upgrade current allowance permeability.
Further preferably, the described difference that judges current allowance permeability and previous allowance permeability whether be specially in preset range judge current allowance permeability and previous allowance permeability difference whether in 1 scope.
Preferably, specifically comprise according to node voltage and/or the short circuit current of each Nodes of the installed capacity Computation distribution formula power supply of distributed power source access low and medium voltage distribution network:
Build the computation model of distributed power source access power distribution network according to the power distribution network parameter of the low and medium voltage distribution network that accesses distributed power source, carry out trend by described computation model according to the installed capacity of distributed power source and calculate and/or calculation of short-circuit current, access node voltage and/or the short circuit current of each Nodes of low and medium voltage distribution network to obtain distributed power source.
Further preferably, the power distribution network parameter of described low and medium voltage distribution network comprises: power distribution network network topological structure parameter, transformer rated capacity, short-circuit impedance, no-load loss, line length, distributed power source access point, power producing characteristics curve and/or payload.
Preferably, the final allowance permeability of described basis determines that the ability of low and medium voltage distribution network admittance distributed power source specifically comprises the installed capacity of admitting distributed power source according to final allowance computing permeability low and medium voltage distribution network, determines the ability of low and medium voltage distribution network admittance distributed power source by this installed capacity.
The application also provides a kind of definite low and medium voltage distribution network to admit the device of distributed electrical source capability.This device comprises: installed capacity determining unit, electric current and voltage calculate unit, electric current and voltage is checked unit, permeability judging unit, and permeability updating block and distributed power source are admitted ability determining unit, wherein:
Described installed capacity determining unit, be used for determining according to current allowance permeability the installed capacity of each distributed power source, described allowance permeability is to allow under the prerequisite that ensures electric power netting safe running and reliable power supply to the maximum distribution formula power supply installed capacity of low and medium voltage distribution network access and the ratio of low and medium voltage distribution network power supply peak load;
Electric current and voltage calculates unit, is used for calculating according to the installed capacity of distributed power source node voltage and/or the short circuit current of each Nodes of the low and medium voltage distribution network that accesses distributed power source;
Electric current and voltage is checked unit, is used for node voltage and/or the short circuit current of each node are checked: when the node voltage of each node and/or short circuit current, during greater than predeterminated voltage threshold values and/or predetermined current threshold values, trigger the permeability judging unit; When the node voltage of each node and/or short circuit current are not more than predeterminated voltage threshold values and/or predetermined current threshold values, trigger the permeability updating block;
Described permeability judging unit, whether the difference that is used for judging current allowance permeability and previous allowance permeability in preset range, if not, triggers the permeability updating block, if so, triggers distributed power source admittance ability determining unit;
Described permeability updating block, be used at the node voltage of each node and/or short circuit current during greater than predeterminated voltage threshold values and/or predetermined current threshold values and the difference of current permeability and previous allowance permeability when preset range is not in preset range, to the low described current allowance permeability of direction renewal; When the node voltage of each node and/or short circuit current are not more than predeterminated voltage threshold values and/or predetermined current threshold values, to high direction, upgrade described current allowance permeability; Allowance permeability after upgrading, as new current allowance permeability, is returned to the step of determining the installed capacity of each distributed power source according to current allowance permeability;
Distributed power source is admitted ability determining unit, is used for determining according to final allowance permeability the ability of low and medium voltage distribution network admittance distributed power source.
Preferably, when described permeability updating block is used for upgrading described current allowance permeability to high direction, specifically comprise: be used for asking for the first mean value subelement of current allowance permeability and the mean value of previous larger allowance permeability, and with the first permeability renewal subelement of the current allowance permeability of this mean value renewal;
When described permeability updating block is used for upgrading described current allowance permeability to low direction, specifically comprise: be used for asking for the second mean value subelement of current allowance permeability and the mean value of previous less allowance permeability, and with the second permeability renewal subelement of the current allowance permeability of this mean value renewal.
Preferably, described electric current and voltage calculates unit and comprises that computation model builds subelement, electric current and voltage computation subunit, described computation model builds subelement, is used for building according to the power distribution network parameter of the low and medium voltage distribution network that accesses distributed power source the computation model of distributed power source access power distribution network; Described electric current and voltage computation subunit, be used for carrying out trend by described computation model according to the installed capacity of distributed power source and calculate and/or calculation of short-circuit current, access node voltage and/or the short circuit current of each Nodes of low and medium voltage distribution network to obtain distributed power source.
Preferably, distributed power source admits ability determining unit specifically to comprise the installed capacity computation subunit, be used for admitting according to final allowance computing permeability low and medium voltage distribution network the installed capacity of distributed power source, determine the ability of low and medium voltage distribution network admittance distributed power source by this installed capacity.
The embodiment of the present application is after the allowance permeability according to preliminary obtains installed capacity, according to this installed capacity computing node voltage and/or short circuit current, then it is checked, according to the result of checking, preliminary allowance permeability is upgraded, until the allowance permeability after upgrading is while meeting default condition, the allowance permeability that obtains, as final allowance permeability, is determined the admittance ability of distributed power source access low and medium voltage distribution network according to final allowance permeability.Compared with prior art, the boundary condition of such key that whether the embodiment of the present application raises by the check node voltage and/or whether short circuit current exceeds standard, automatic exploration and definite distributed power source access the allowance permeability of power distribution network repeatedly, thereby realize permitting automatic, the accurate analysis of permeability, and obtain on this basis determining the admittance ability of low and medium voltage distribution network to distributed power source more accurately.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, the accompanying drawing that the following describes is only some embodiment that put down in writing in the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 admits the flow chart of the embodiment of the method for distributed electrical source capability for determining low and medium voltage distribution network;
Fig. 2 is the flow chart of the instantiation of the described embodiment of Fig. 1;
A kind of electrical block diagram when Fig. 3 is trend calculating;
Fig. 4 admits the structured flowchart of the device embodiment of distributed electrical source capability for determining low and medium voltage distribution network.
Embodiment
In order to make those skilled in the art person understand better technical scheme in the application, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Based on the embodiment in the application, those of ordinary skills are not making under the creative work prerequisite the every other embodiment that obtains, and all should belong to the scope of the application's protection.
Referring to Fig. 1, the definite low and medium voltage distribution network that the figure shows the application is admitted the flow process of the embodiment of the method for distributed electrical source capability.This flow process comprises:
Step S101: determine the installed capacity of each distributed power source according to current allowance permeability, described allowance permeability is to allow under the prerequisite that ensures electric power netting safe running and reliable power supply to the maximum distribution formula power supply installed capacity of low and medium voltage distribution network access and the ratio of low and medium voltage distribution network power supply peak-peak load;
Permit permeability and given expression to relation between the accessible maximum distribution formula power supply installed capacity of low and medium voltage distribution network is loaded with this power distribution network power supply peak-peak, in the situation that two key elements wherein can be determined another key element according to the concept of permitting permeability.Generally, low and medium voltage distribution network power supply peak-peak load is comparatively fixing over a period to come, can determine by the mean value of asking for this regular period the peak-peak load of power distribution network power supply, the low and medium voltage distribution network here is generally the following power distribution network of 10kV, the scale less of this power distribution network, be different from the big-and-middle-sized power distribution networks such as provincial.Also need to prove: the current allowance permeability here comprises two kinds of situations: the one, while initially carrying out the embodiment of the present application, current allowance permeability need to preset, predefined permission permeability can be random, because according to the step of the present embodiment back as can be known, final allowance permeability and the allowance permeability of initial setting are had little or nothing to do with, no matter initial allowance permeability arranges too much or too small, after several adjustment of taking turns of subsequent step, all will converge on final allowance permeability.Certainly, in order to reduce the number of times of cycle calculations, the initial allowance permeability of near final, permitting permeability can be set as much as possible rule of thumb.
Step S102: the node voltage and/or the short circuit current that calculate each Nodes of the low and medium voltage distribution network that accesses distributed power source according to the installed capacity of distributed power source;
here the boundary condition of selecting to calculate is node voltage or short circuit current, perhaps both computing node voltage, calculate again short circuit current, concrete which kind of calculating purpose of selecting, the situation that depends on actual power distribution network, such as, for urban distribution network, owing to affected by circuit breaker interrupting capacity and usually adopting low-impedance cable, substantially the problem that does not have voltage to raise, therefore, the emphasis of paying close attention to can be short circuit current, and then the scheme of short circuit current is only calculated in employing, certainly, in this case, for the purpose of accurately, also can consider the variation of node voltage, being about to two boundary conditions all considers in the ability process of determining power distribution network admittance distributed power source.Here why selecting these two boundary conditions is because they admit the ability of distributed power source to have material impact to low and medium voltage distribution network, belongs to core and checks criterion.Concrete computing node voltage, the mode that can adopt trend to calculate; The concrete short circuit current that calculates, can adopt the addition method to calculate.
Step S103: node voltage and/or short circuit current to each node are checked: when the node voltage of each node and/or short circuit current, during greater than predeterminated voltage threshold values and/or predetermined current threshold values, enter step S104; When the node voltage of each node and/or short circuit current are not more than predeterminated voltage threshold values and/or predetermined current threshold values, execution step S103(a): to high direction, upgrade described current allowance permeability, allowance permeability after upgrading, as new current allowance permeability, is returned to step S101;
As previously mentioned, may there be two kinds of situations in mode of operation to permeability after the node voltage to each node and short circuit current are checked: when being while checking for the first time, when if the node voltage of each node and/or short circuit current are not more than predeterminated voltage threshold values and/or predetermined current threshold values, the initial permeability of explanation setting may be less, need to tune up, namely to high direction, carry out the renewal of initial permeability, and then return to step S101 and carry out correlation computations; , if the node voltage of each node and/or short circuit current during greater than predeterminated voltage threshold values and/or predetermined current threshold values, can't directly illustrate the situation of the initial permeability of setting, also need further with permeability last time, to compare; When being for the second time and during follow-up the check, when if the node voltage of each node and/or short circuit current are not more than predeterminated voltage threshold values and/or predetermined current threshold values, illustrate that current permeability may be less, need to heighten, namely to high direction, carry out the renewal of initial permeability.
Step S104: judge that the difference of current allowance permeability and previous allowance permeability is whether in preset range, if not, perform step S104(a): upgrade described current allowance permeability to low direction, allowance permeability after upgrading, as new current allowance permeability, is returned to step S101; If so, enter step S105;
through being compared, current allowance permeability and previous allowance permeability (annotate: when carrying out the comparison of twice permeability for the first time, last time permeability can adopt zero), if this difference is in preset range, such as in 1 scope (namely the difference degree of two permeabilities is no more than 1), illustrate that this current allowance permeability can meet the demands, the low and medium voltage distribution network of determining by this permeability can not have a negative impact to stable operation and the reliable power supply of electrical network to the admittance ability of distributed power source, at this moment this allowance permeability can be defined as final permeability, if this difference not in preset range, illustrates that current permeability is also unstable, and higher, need to adjust current allowance permeability to low direction, namely reduce current allowance permeability.Can see by aforementioned two steps, the embodiment of the present application can automatically be regulated the allowance permeability, and after taking turns above circulation by one, the allowance permeability of initial setting up will converge on the final allowance permeability of really admitting ability near low and medium voltage distribution network.
Step S105: the ability of determining low and medium voltage distribution network admittance distributed power source according to final allowance permeability.
This method embodiment is after the allowance permeability according to preliminary obtains installed capacity, according to this installed capacity computing node voltage and/or short circuit current, then it is checked, according to the result of checking, preliminary allowance permeability is upgraded, until the allowance permeability after upgrading is while meeting default condition, the allowance permeability that obtains, as final allowance permeability, is determined the admittance ability of distributed power source access low and medium voltage distribution network according to final allowance permeability.Compared with prior art, the boundary condition of such key that whether this method embodiment raises by the check node voltage and/or whether short circuit current exceeds standard, automatic exploration and definite distributed power source access the allowance permeability of power distribution network repeatedly, thereby realize permitting automatic, the accurate analysis of permeability, and obtain on this basis determining the admittance ability of low and medium voltage distribution network to distributed power source more accurately.
, in order to further illustrate the application's technical scheme, below on the basis of previous embodiment, provide a concrete example., referring to Fig. 2, the figure shows the flow process of this example.This flow process comprises:
Step S201: the power distribution network parameter of determining to contain distributed power source, these parameters can comprise chooses typical power distribution network, determine the network connection mode, transformer rated capacity, short-circuit impedance, no-load loss, circuit model, length, impedance, distributed power source access point and power producing characteristics curve, payload, access point and characteristic curve.
Step S202: according to current allowance permeability, determine each distributed power source installed capacity, in this step, if determine for the first time installed capacity, adopt the default initial allowance permeability that limits to determine the installed capacity of each distributed power source, for the second time and after this, if, adopt current allowance permeability to determine the installed capacity of each distributed power source;
Step S203: utilize aforementioned data to build the computation model of distributed power source access power distribution network; This example can be by creation analysis model in CeaDER software.CeaDER(Comprehensive economic analysis of Distributed Energy Resource, distributed power source access complex art Economic Analysis Software) be the software of Based on Distributed power supply access power distribution network synthesis technical economic analysis, have accurate three-phase imbalance trend and calculate and the calculation of short-circuit current function.
Step S204: by computation model, undertaken that trend is calculated and short circuit calculation is obtained voltage and the short circuit current of each node that accesses distributed power source;
Calculate for trend, as an example of the structure of the power distribution network in Fig. 3 example, describe: usually require any two adjacent nodes in power distribution network to meet following calculating formula and require:
In following formula, r and x are respectively resistance and the reactance values of circuit, and U, P and Q are voltage, active power and the reactive powers of this section circuit left end; UL, PL and QL are voltage, active power and the reactive powers of this section circuit right-hand member; The algorithm that concrete trend is calculated comprises multiple: front pushing manipulation, modified Newton method, circuit impedance method and the implicit expression Zbus Gaussian processes of pushing back.
For calculation of short-circuit current, can adopt the addition method to calculate, the state before namely at first utilizing result that Three-phase Power Flow calculates as fault, obtain the voltage before the short dot fault; Then short circuit is regarded as at negative voltage source of short dot stack, short trouble is decomposed into normal operating mode and the fault component with a voltage source; Then utilize trend result and failure boundary condition to calculate the Fault Compensation electric current at place, fault point; Finally with the Fault Compensation electric current as the injection rate malfunctioning node that is added to, just can calculate each branch trouble electric current and each node voltage through pushing through journey before once pushing back.
Step S205: according to result of calculation, node voltage and the short circuit current of each node in network are checked, judge whether to require and power distribution network switchgear ability greater than the supply power voltage of national Specification; If greater than, enter step S206; If be not more than, illustrate that the permeability of this time souning out is less, do not reach the allowance permeability, enter step S208;
Step S206: judge and whether sound out current permeability and last time the permeability difference greater than 1, if so, the permeability of this time exploration of explanation is larger, surpasses and permits permeability, enters step S207; If not, the permeability of this time exploration of explanation, for permitting permeability, enters step S209;
Step S207: this exploration permeability and before once less exploration permeability are averaged, and round, return to step S202;
Step S208: with this sound out permeability and before once larger exploration permeability average, and round, return to step S202;
Step S209: according to the final allowance permeability and the payload that calculate, determine the admittance ability.
The method of previous embodiment and embodiment is applied to the typical power distribution network of China, can obtain following conclusion: if the electrical network of choosing is urban distribution network, because mainly being subjected to circuit breaker interrupting capacity, it affects, distributed natural gas generating and wind-powered electricity generation are retrained by short circuit current, and it is permitted permeability and is about 15%.And the short circuit current of photovoltaic generation and rated current are more or less the same, its contribution to short circuit current is little, permitting permeability is subjected to power constraint less, when if the circuit breaker rated capacity is chosen 20kA, it is 20.58% that the wind-powered electricity generation that allows in whole change radio area is permitted permeability, and it is 15.54% that permeability is permitted in natural gas power.
Above-described embodiment has described definite low and medium voltage distribution network of the application in detail and has admitted the embodiment of the method for distributed electrical source capability, and correspondingly, the application also provides a kind of definite low and medium voltage distribution network to admit the device embodiment of distributed electrical source capability., referring to Fig. 4, the figure shows the structured flowchart of the device embodiment that determines low and medium voltage distribution network admittance distributed electrical source capability.This device comprises: installed capacity determining unit 401, electric current and voltage calculate unit 402, electric current and voltage is checked unit 403, permeability judging unit 404, and permeability updating block 405 and distributed power source are admitted ability determining unit 406, wherein:
Installed capacity determining unit 401, be used for determining according to current allowance permeability the installed capacity of each distributed power source, described allowance permeability is to allow under the prerequisite that ensures electric power netting safe running and reliable power supply to the maximum distribution formula power supply installed capacity of low and medium voltage distribution network access and the ratio of low and medium voltage distribution network power supply peak load;
Electric current and voltage calculates unit 402, is used for calculating according to the installed capacity of distributed power source node voltage and/or the short circuit current of each Nodes of the low and medium voltage distribution network that accesses distributed power source;
Electric current and voltage is checked unit 403, is used for node voltage and/or the short circuit current of each node are checked: when the node voltage of each node and/or short circuit current, during greater than predeterminated voltage threshold values and/or predetermined current threshold values, trigger the permeability judging unit; When the node voltage of each node and/or short circuit current are not more than predeterminated voltage threshold values and/or predetermined current threshold values, trigger the permeability updating block;
Distributed power source is admitted ability determining unit 406, is used for determining according to final allowance permeability the ability of low and medium voltage distribution network admittance distributed power source.
The course of work of this device embodiment is: installed capacity determining unit 401 is determined the installed capacity of each distributed power source according to current allowance permeability, and electric current and voltage calculates node voltage and/or the short circuit current of unit 402 according to each Nodes of the installed capacity Computation distribution formula power supply access low and medium voltage distribution network of distributed power source; Node voltage and/or the short circuit current of then by electric current and voltage, checking 403 pairs of each nodes in unit are checked: when the node voltage of each node and/or short circuit current during greater than predeterminated voltage threshold values and/or predetermined current threshold values, trigger permeability judging unit 404 and judge that the difference of current allowance permeability and previous allowance permeability is whether in preset range, if not, trigger permeability updating block 405 and upgrade described current allowance permeability to high direction, if so, trigger distributed power source and admit ability determining unit 406; When the node voltage of each node and/or short circuit current are not more than predeterminated voltage threshold values and/or predetermined current threshold values, trigger permeability updating block 405 and upgrade described current allowance permeability to low direction, the installation volume determining unit 401 of then setting out; Finally, by distributed power source, admit ability determining unit 406, determine the ability of low and medium voltage distribution network admittance distributed power source according to final allowance permeability.
This device embodiment is after the allowance permeability according to preliminary obtains installed capacity, according to this installed capacity computing node voltage and/or short circuit current, then it is checked, according to the result of checking, preliminary allowance permeability is upgraded, until the allowance permeability after upgrading is while meeting default condition, the allowance permeability that obtains, as final allowance permeability, is determined the admittance ability of distributed power source access low and medium voltage distribution network according to final allowance permeability.Compared with prior art, the boundary condition of such key that whether this device embodiment raises by the check node voltage and/or whether short circuit current exceeds standard, automatic exploration and definite distributed power source access the allowance permeability of power distribution network repeatedly, thereby realize permitting automatic, the accurate analysis of permeability, and obtain on this basis determining the admittance ability of low and medium voltage distribution network to distributed power source more accurately.
Said apparatus embodiment is based on the different implementations to each functional unit, and its internal structure may be different.Such as, for the permeability updating block, when being used for upgrading described current allowance permeability to high direction, can specifically comprise: be used for asking for the first mean value subelement of current allowance permeability and the mean value of previous larger allowance permeability, and with the first permeability renewal subelement of the current allowance permeability of this mean value renewal; When being used for upgrading described current allowance permeability to low direction, can specifically comprise: be used for asking for the second mean value subelement of current allowance permeability and the mean value of previous less allowance permeability, and with the second permeability renewal subelement of the current allowance permeability of this mean value renewal.Also such as, calculate unit 402 for electric current and voltage and can comprise that computation model builds subelement 4021, electric current and voltage computation subunit 4022, computation model builds subelement 4021, is used for building according to the power distribution network parameter of the low and medium voltage distribution network that accesses distributed power source the computation model of distributed power source access power distribution network; Electric current and voltage computation subunit 4022, be used for carrying out trend by described computation model according to the installed capacity of distributed power source and calculate and/or calculation of short-circuit current, access node voltage and/or the short circuit current of each Nodes of low and medium voltage distribution network to obtain distributed power source.For another example, if when above-mentioned distributed power source admits ability determining unit 406 to adopt the mode of calculating installed capacity to determine that power distribution network is admitted the ability of distributed power source, can specifically comprise installed capacity computation subunit 4061.One skilled in the art will appreciate that based on various purpose, can also carry out various distortion to above-described embodiment under the driving of actual needs, better to be installed.
Need to prove: easy for what narrate, what the various distortion implementations of above-described embodiment of this specification and embodiment stressed is all and the difference of other embodiment or mode of texturing that between each situation, identical similar part is mutually referring to getting final product.Especially, for several improved procedures of device embodiment, substantially similar in appearance to embodiment of the method, so describe fairly simplely, relevant part gets final product referring to the part explanation of embodiment of the method due to it.Each unit of device embodiment described above can or can not be also physically to separate, and both can be positioned at a place, perhaps also can be distributed to a plurality of net environments.In actual application, can select according to the actual needs wherein some or all of unit to realize the purpose of the present embodiment scheme, those of ordinary skills in the situation that do not pay creative work, namely can understand and implement.
The above is only the application's embodiment; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the application's protection range.
Claims (10)
1. the method that definite low and medium voltage distribution network is admitted the distributed electrical source capability, is characterized in that, comprising:
Determine the installed capacity of each distributed power source according to current allowance permeability, described allowance permeability is to allow under the prerequisite that ensures electric power netting safe running and reliable power supply to the maximum distribution formula power supply installed capacity of low and medium voltage distribution network access and the ratio of low and medium voltage distribution network power supply peak load;
Calculate node voltage and/or the short circuit current of each Nodes of the low and medium voltage distribution network that accesses distributed power source according to the installed capacity of distributed power source;
Node voltage and/or short circuit current to each node are checked: when the node voltage of each node and/or short circuit current during greater than predeterminated voltage threshold values and/or predetermined current threshold values, judge that the difference of current allowance permeability and previous allowance permeability is whether in preset range, if not, to low direction, upgrade described current allowance permeability, if so, with current allowance permeability as final allowance permeability; When the node voltage of each node and/or short circuit current are not more than predeterminated voltage threshold values and/or predetermined current threshold values, to high direction, upgrade described current allowance permeability; Allowance permeability after upgrading, as new current allowance permeability, is returned to the step of determining the installed capacity of each distributed power source according to current allowance permeability;
Determine the ability of low and medium voltage distribution network admittance distributed power source according to final allowance permeability.
2. method according to claim 1, is characterized in that, describedly upgrades described current allowance permeability to high direction and comprise:
Ask for the mean value of current allowance permeability and previous larger allowance permeability, with this mean value, upgrade current allowance permeability;
Describedly upgrade described current allowance permeability to low direction and comprise:
Ask for the mean value of current allowance permeability and previous less allowance permeability, with this mean value, upgrade current allowance permeability.
3. method according to claim 2, it is characterized in that, if determine installed capacity according to current allowance permeability for the first time, described current allowance permeability is default initial allowance permeability, the described difference that judges current allowance permeability and previous allowance permeability whether be specially in preset range judge current allowance permeability and previous allowance permeability difference whether in 1 scope.
4. method according to claim 1, is characterized in that, according to node voltage and/or the short circuit current of each Nodes of the installed capacity Computation distribution formula power supply of distributed power source access low and medium voltage distribution network, specifically comprises:
Build the computation model of distributed power source access power distribution network according to the power distribution network parameter of the low and medium voltage distribution network that accesses distributed power source, carry out trend by described computation model according to the installed capacity of distributed power source and calculate and/or calculation of short-circuit current, access node voltage and/or the short circuit current of each Nodes of low and medium voltage distribution network to obtain distributed power source.
5. method according to claim 4, it is characterized in that, the power distribution network parameter of described low and medium voltage distribution network comprises: power distribution network network topological structure parameter, transformer rated capacity, short-circuit impedance, no-load loss, line length, distributed power source access point, power producing characteristics curve and/or payload.
6. any one described method according to claim 1 to 5, it is characterized in that, the final allowance permeability of described basis determines that the ability of low and medium voltage distribution network admittance distributed power source specifically comprises the installed capacity of admitting distributed power source according to final allowance computing permeability low and medium voltage distribution network, determines the ability of low and medium voltage distribution network admittance distributed power source by this installed capacity.
7. a definite low and medium voltage distribution network is admitted the device of distributed electrical source capability, it is characterized in that, this device comprises: installed capacity determining unit, electric current and voltage calculate unit, electric current and voltage is checked unit, permeability judging unit, permeability updating block and distributed power source are admitted ability determining unit, wherein:
Described installed capacity determining unit, be used for determining according to current allowance permeability the installed capacity of each distributed power source, described allowance permeability is to allow under the prerequisite that ensures electric power netting safe running and reliable power supply to the maximum distribution formula power supply installed capacity of low and medium voltage distribution network access and the ratio of low and medium voltage distribution network power supply peak load;
Described electric current and voltage calculates unit, is used for calculating according to the installed capacity of distributed power source node voltage and/or the short circuit current of each Nodes of the low and medium voltage distribution network that accesses distributed power source;
Described electric current and voltage is checked unit, is used for node voltage and/or the short circuit current of each node are checked: when the node voltage of each node and/or short circuit current, during greater than predeterminated voltage threshold values and/or predetermined current threshold values, trigger the permeability judging unit; When the node voltage of each node and/or short circuit current are not more than predeterminated voltage threshold values and/or predetermined current threshold values, trigger the permeability updating block;
Described permeability judging unit, whether the difference that is used for judging current allowance permeability and previous allowance permeability in preset range, if not, triggers the permeability updating block, if so, triggers distributed power source admittance ability determining unit;
Described permeability updating block, be used at the node voltage of each node and/or short circuit current during greater than predeterminated voltage threshold values and/or predetermined current threshold values and the difference of current permeability and previous allowance permeability when preset range is not in preset range, to the low described current allowance permeability of direction renewal; When the node voltage of each node and/or short circuit current are not more than predeterminated voltage threshold values and/or predetermined current threshold values, to high direction, upgrade described current allowance permeability; Allowance permeability after upgrading, as new current allowance permeability, is returned to the step of determining the installed capacity of each distributed power source according to current allowance permeability;
Described distributed power source is admitted ability determining unit, is used for determining according to final allowance permeability the ability of low and medium voltage distribution network admittance distributed power source.
8. device according to claim 7, it is characterized in that, when described permeability updating block is used for upgrading described current allowance permeability to high direction, specifically comprise: be used for asking for the first mean value subelement of current allowance permeability and the mean value of previous larger allowance permeability, and with the first permeability renewal subelement of the current allowance permeability of this mean value renewal;
When described permeability updating block is used for upgrading described current allowance permeability to low direction, specifically comprise: be used for asking for the second mean value subelement of current allowance permeability and the mean value of previous less allowance permeability, and with the second permeability renewal subelement of the current allowance permeability of this mean value renewal.
9. device according to claim 7, it is characterized in that, described electric current and voltage calculates unit and comprises that computation model builds subelement, electric current and voltage computation subunit, described computation model builds subelement, is used for building according to the power distribution network parameter of the low and medium voltage distribution network that accesses distributed power source the computation model of distributed power source access power distribution network; Described electric current and voltage computation subunit, be used for carrying out trend by described computation model according to the installed capacity of distributed power source and calculate and/or calculation of short-circuit current, access node voltage and/or the short circuit current of each Nodes of low and medium voltage distribution network to obtain distributed power source.
10. any one described device according to claim 7 to 9, it is characterized in that, distributed power source admits ability determining unit specifically to comprise the installed capacity computation subunit, be used for admitting according to final allowance computing permeability low and medium voltage distribution network the installed capacity of distributed power source, determine the ability of low and medium voltage distribution network admittance distributed power source by this installed capacity.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887792A (en) * | 2014-03-21 | 2014-06-25 | 北京四方继保自动化股份有限公司 | Modeling method of low-voltage distribution network with distributed power supply |
| CN104795813A (en) * | 2015-04-09 | 2015-07-22 | 中国电力科学研究院 | Method for constructing medium-voltage distribution network demonstration system accessed by adaptive distributed power source |
| CN104979828A (en) * | 2015-07-08 | 2015-10-14 | 国家电网公司 | Analysis method and analysis device for reconstructing power distribution network after access of distributed power source to power distribution network |
| CN105046425A (en) * | 2015-07-03 | 2015-11-11 | 深圳供电局有限公司 | Method and system for evaluating power distribution network access capacity of distributed energy system |
| CN105305433A (en) * | 2015-11-10 | 2016-02-03 | 中国能源建设集团广东省电力设计研究院有限公司 | Maximum power permeability calculation method for distributed power supply in connection to power distribution network |
| CN105356464A (en) * | 2015-12-10 | 2016-02-24 | 国家电网公司 | Method and device for joint planning of distributed power supply and power distribution network |
| CN105896604A (en) * | 2016-05-25 | 2016-08-24 | 国网天津武清供电有限公司 | Calculation method of ultimate capacity of distributed photovoltaic power generation system connected to power network |
| CN107769271A (en) * | 2017-10-30 | 2018-03-06 | 国网能源研究院有限公司 | A kind of new energy integrates digestion capability appraisal procedure |
| WO2018209945A1 (en) * | 2017-05-19 | 2018-11-22 | 国网江苏省电力公司常州供电公司 | Active power distribution network feeder automation system test method |
| CN109560568A (en) * | 2017-09-25 | 2019-04-02 | 中国电力科学研究院 | Double-fed fan motor field maximum based on short circuit current nargin can access capacity determining methods |
| CN109659934A (en) * | 2018-12-24 | 2019-04-19 | 中国电力科学研究院有限公司 | New-energy grid-connected based on short circuit current nargin plans preferred method |
| CN110456223A (en) * | 2019-08-19 | 2019-11-15 | 西南交通大学 | A kind of power distribution network short circuit current measuring method containing distributed generation resource and electric car |
| CN111030160A (en) * | 2018-10-10 | 2020-04-17 | 中国电力科学研究院有限公司 | Method and device for evaluating distributed power supply accepting capacity of power distribution network |
| CN111198332A (en) * | 2018-11-16 | 2020-05-26 | 中国电力科学研究院有限公司 | Method for calculating medium-voltage feeder admission capacity of distributed power supply access in random scene |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103150606A (en) * | 2013-01-22 | 2013-06-12 | 中国电力科学研究院 | Optimal power flow optimization method of distributed power supplies |
-
2013
- 2013-08-13 CN CN201310351159.3A patent/CN103401270B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103150606A (en) * | 2013-01-22 | 2013-06-12 | 中国电力科学研究院 | Optimal power flow optimization method of distributed power supplies |
Non-Patent Citations (3)
| Title |
|---|
| 张佳佳等: "微网高渗透对电网稳定性的影响分析", 《电力科学与技术学报》 * |
| 李晓明等: "配电网接纳分布式光伏电源容量分析", 《河北电力技术》 * |
| 李晓春等: "微网并网容量分析", 《电网与清洁能源》 * |
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