CN102751733A - On-line three-phase load unbalance processing method suitable for low-voltage distribution network - Google Patents
On-line three-phase load unbalance processing method suitable for low-voltage distribution network Download PDFInfo
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Abstract
The invention provides an on-line three-phase load unbalance processing method suitable for a low-voltage distribution network. The on-line three-phase load unbalance processing method comprises the following steps of: monitoring three-phase load by three-phase load monitoring units on the low voltage side of a distribution transformer, and transmitting monitoring data to three-phase load unbalance monitoring units of the distribution transformer; judging whether the three-phase load unbalance exceeds a standard value or not by the three-phase load unbalance monitoring units of the distribution transformer; if the three-phase load unbalance exceeds the standard value, transmitting signals to an on-line load phase modulation control unit by a communication unit; judging whether the three-phase load unbalance of the distribution transformer is caused by the three-phase load unbalance of a main low-voltage circuit or not by the on-line load phase modulation control unit; and if so, setting an on-line load phase modulation strategy according to the monitoring data of the load monitoring units of branches of three phases of the main low-voltage circuit, sending a control command to an on-line load phase modulation switch combination unit by an on-line load phase modulation judging and controlling unit, and switching the load phases of the branches of users so as to realize the on-line three-phase load unbalance processing.
Description
Technical field
The present invention relates to field of power, be specifically related to a kind of online improvement three-phase load unbalanced method that is applicable to low-voltage network.
Background technology
Power distribution station, certain areas low-voltage circuit is longer; And have a large amount of single-phase loads, power distribution station three-phase load energy imbalance is general, and there is unsymmetrical current in unequal the making of three-phase current on the neutral line; Cause distribution transformer and low-voltage circuit loss to increase; The actual reduction of exerting oneself of distribution transformer, and the user's voltage that causes heavy load to go up mutually easily is on the low side, can't satisfy urban residents' ordinary production and household electricity demand.Although through adopting the three-phase imbalance control measures can reduce the unbalanced order of severity of power distribution station three-phase load to a certain extent; But because the randomness and the uncertainty of power load; And the uneven situation of three-phase load has a stronger real-time; Rely on manual work to carry out online frequent adjustment according to the actual load unbalance condition; And have potential safety hazard to a certain extent, each sharing of load of going up mutually of off-line adjustment low-voltage circuit will influence the power supply reliability to the user inevitably.At present the part rural area is employed in the distribution transforming low-pressure side and carries out the mode of alternate reactive power compensation and adjust the three-phase load unbalance condition; But this mode can only be adjusted the distribution transforming self problem to a certain extent, and can not solve the uneven situation of three-phase load of low-voltage circuit.The proposition of this method can effectively solve countryside low-voltage electric distribution network three-phase load imbalance problem; Can realize that the three-phase load of adjusting the low pressure basic routing line in real time distributes; Make the load on basic routing line and distribution transforming self A, B, the C three-phase reach balance as far as possible, countryside low-voltage electric distribution network three-phase load degree of unbalance is controlled in the acceptability limit.
Summary of the invention
Deficiency to prior art; The present invention provides a kind of online improvement three-phase load unbalanced method that is applicable to low-voltage network, and the data communication between distribution transforming low-pressure side monitoring point and low pressure trunk hinge branch monitoring point is provided, and judges each branch's payload mutually of uneven situation of distribution transforming low-pressure side three-phase load and low pressure backbone in real time; And real-time online load phase modulation; Reach and administer the unbalanced purpose of low-voltage network three-phase load, effectively reduce the low pressure line loss, improve the supply power voltage quality.
A kind of online improvement three-phase load unbalanced method that is applicable to low-voltage network provided by the invention, its improvements are that said method comprises the steps:
(1) distribution transformer low-pressure side three-phase load monitoring means monitoring three-phase load is big or small, and Monitoring Data is passed to distribution transformer three-phase load degree of unbalance monitoring means;
(2) said distribution transformer three-phase load degree of unbalance monitoring means is judged whether value of being above standard of three-phase load degree of unbalance; If the value of being above standard is then passed to signal at specific electric load phase modulation control unit through downlink communication unit I and uplink communication unit II, otherwise returns step (1);
(3) saidly judge at specific electric load phase modulation control unit whether distribution transformer three-phase load degree of unbalance is caused by low pressure basic routing line three-phase load degree of unbalance; If then the Monitoring Data according to each branch load monitoring unit of low pressure basic routing line three-phase customizes at specific electric load phase modulation strategy; By judging control unit at the specific electric load phase modulation to sending control command at specific electric load phase modulation diverter switch assembled unit, otherwise in kind whether each branch's load of other low pressure basic routing line three-phases of steps in sequence analysis and judgement distribution transformer exists the uneven situation of three-phase load;
(4) said at specific electric load phase modulation diverter switch assembled unit according to said control command to the separate switching of loading of user branch, realize that online improvement three-phase load is uneven.
Wherein, each branch's load of low pressure basic routing line three-phase is connected with each phase line of backbone at specific electric load phase modulation diverter switch assembled unit through said; Said is target at specific electric load phase modulation control unit with distribution transformer low-pressure side three-phase load and low pressure backbone three-phrase burden balance, and each branch's load of control three-phase is connected to corresponding phase line, realizes loading and redistributes.
Wherein, the real time data of said distribution transformer low-pressure side three-phase load monitoring means monitoring is passed to information management system through uplink communication unit I.
Wherein, the said standard value of step (2) is according to the load management of industry standard SD292 " overhead distribution and equipment operation rules " transformer three-phase load degree of unbalance to be required to set, and its set point is 15%.
Wherein, step (4) is said is connected with user branch on-load switch through each phase branch line terminal board at specific electric load phase modulation diverter switch assembled unit.
Wherein, Step (3) is said judges that at specific electric load phase modulation control unit distribution transformer three-phase load degree of unbalance is according to said distribution transformer low-pressure side three-phase load monitoring means data monitored and low pressure basic routing line three-phase load monitoring means data monitored; If low-pressure side basic routing line three-phase load imbalance value of being above standard; Judge that then this low pressure basic routing line three-phase load imbalance is to cause distribution transformer three-phase load reason of unbalanced, need regulation and control.
With the prior art ratio, beneficial effect of the present invention is:
The present invention can be implemented in line does not have arc load phase modulation, keeps power supply continuity, and load phase modulation process do not have impact, guarantees low-voltage network power supply reliability and power supply quality.
The present invention can provide the data communication between distribution transforming low-pressure side monitoring point and low pressure trunk hinge branch monitoring point; Judge in real time each branch's payload mutually of uneven situation of distribution transforming low-pressure side three-phase load and low pressure backbone; And then be formed on specific electric load phase modulation control strategy; Cut-off control through multichannel (as 36 road or 18 tunnel) code switch and be implemented in the specific electric load phase modulation, reach and administer the unbalanced purpose of low-voltage network three-phase load.
The invention solves power supply enterprise and administer the uneven difficult practical problem of low-voltage network three-phase load; Core technology and the unbalanced methods of the online improvement low-voltage network of multi-channel switch three-phase load such as comprehensive utilization intellectual monitoring, telecommunication and Based Intelligent Control are provided; Effectively promote the distribution transforming power supply capacity; Reduce the low-voltage circuit loss, improve user's supply power voltage quality.
Description of drawings
Fig. 1 is that the uneven function of the online improvement three-phase load of low-voltage network provided by the invention realizes block diagram.
Fig. 2 is the specific electric load phase modulation switching principle that is controlled at provided by the invention.
Fig. 3 is provided by the invention at the initial shape of specific electric load phase modulation diverter switch.
Fig. 4 is controlled at diverter switch behind the specific electric load phase modulation for provided by the invention.
Embodiment
Do further to specify below in conjunction with the accompanying drawing specific embodiments of the invention.
The present invention makes full use of advanced monitoring, communication and automatic control technology; According to each phase load size of distribution transforming low-pressure side and three-phase load degree of unbalance monitoring estimate of situation; Carry out the alternate switching of switch multichannel; Realize the online phase modulation of low-voltage load, under the situation that does not influence power supply reliability, make distribution transforming low-pressure side three-phase load reach balance automatically and distribute, thereby the online improvement three-phase load of a kind of low-voltage network unbalanced method is provided.It utilizes core technologies such as intellectual monitoring, telecommunication and Based Intelligent Control; At first set up the two-stage monitoring means, and set up two-stage or three grades of communication networks, be formed on the specific electric load phase modulation and judge decision center; Be combined in the combination of specific electric load phase modulation diverter switch; And make every phase branch load all possess online separate conversion condition through configuration, form " monitoring---communication---strategy is judged---control " circulating system, be configured to the online improvement three-phase load of low-voltage network unbalanced method.
Fig. 1 is that the uneven function of the online improvement three-phase load of low-voltage network realizes block diagram.As shown in Figure 1; Mainly comprise distribution transforming low-pressure side dispensing unit and low pressure backbone branch hinge dispensing unit two parts; Wherein distribution transforming low-pressure side dispensing unit comprises the uplink communication unit again; Distribution transforming low-pressure side A, B, C three-phase load monitoring means, distribution transforming three-phase load degree of unbalance monitoring means, downlink communication unit; Low pressure backbone branch hinge dispensing unit comprises the uplink communication unit, low pressure basic routing line A, B, C three-phase load monitoring means; A, B, each branch load monitoring unit of C three-phase are at specific electric load phase modulation control unit, at specific electric load phase modulation diverter switch assembled unit.Distribution transforming low-pressure side A, B, C three-phase load monitoring means can communicate by letter with county power supply enterprise existing or newly-built background information management system realization through the uplink communication unit; Can be connected with customer charge through each phase branch line terminal board at specific electric load phase modulation diverter switch assembled unit.
Monitoring situation according to distribution transforming low-pressure side A, B, C three-phase load monitoring means and distribution transforming three-phase load degree of unbalance monitoring means; If distribution transforming three-phase load degree of unbalance value of being above standard (being 15%); Then pass through the downlink communication unit and realize communicating by letter at specific electric load phase modulation control unit; Each monitors situation and low pressure basic routing line A, B, the C three-phase load monitoring means monitoring situation to low pressure basic routing line A, B, C three-phase load mutually to the distribution transforming low-pressure side of payload according to distribution transforming low-pressure side A, B, C three-phase load monitoring means again at specific electric load phase modulation control unit; Judge whether it is that this basic routing line three-phase load imbalance causes; If, be formed on specific electric load phase modulation strategy, by sending control command at specific electric load phase modulation control unit then again according to the monitoring situation of low pressure basic routing line A, B, each branch load monitoring unit of C three-phase; Be controlled at specific electric load phase modulation diverter switch combination and realize branch's separate switching of loading, reach the unbalanced purpose of the online improvement three-phase load of low-voltage network.
Judge that at specific electric load phase modulation control unit distribution transformer three-phase load degree of unbalance is according to said distribution transformer low-pressure side three-phase load monitoring means data monitored and low pressure basic routing line three-phase load monitoring means data monitored; If this low pressure basic routing line three-phase load imbalance value of being above standard 15%; Judge that then this low pressure basic routing line three-phase load imbalance is to cause one of distribution transformer three-phase load reason of unbalanced, need adjust; If this low pressure basic routing line three-phase load imbalance value of not being above standard (15%); Judge that then this low pressure basic routing line is not to cause the unbalanced main cause of distribution transformer three-phase load, then in kind whether each branch's load of other low pressure basic routing line three-phases of steps in sequence analysis and judgement distribution transformer exists the uneven situation of three-phase load.
Fig. 2 is for being controlled at specific electric load phase modulation switching principle figure.The low district basic routing line A that presents a theatrical performance as the last item on a programme, B, each branch's load of C three-phase are through being connected with each phase line of backbone in the combination of specific electric load phasing switch; By in the monitoring situation of specific electric load phase modulation control unit according to each phase load; With distribution transforming low-pressure side three-phase load and low pressure backbone three-phrase burden balance is target; Control A, B, each branch's load of C three-phase are connected to corresponding phase line, realize loading and redistribute.
Fig. 3 is in specific electric load phase modulation diverter switch initial condition.A phase branch load is all received the A phase of low pressure backbone through the diverter switch combination, and carries out A and identify mutually, and the A that just is connected the low pressure backbone like the A11-A1n user on the A phase branch line 1 goes up mutually; In like manner, B phase branch load is all received the B phase of low pressure backbone through the diverter switch combination, and carries out B and identify mutually; C phase branch load is all received the C phase of low pressure backbone through the diverter switch combination, and carries out C and identify mutually.
Fig. 4 is for being controlled at diverter switch state behind the specific electric load phase modulation.According to distribution transforming low-pressure side A, B, C three-phase load monitoring means, distribution transforming three-phase load degree of unbalance monitoring means, low pressure basic routing line A, B, C three-phase load monitoring means; A, B, each branch load monitoring unit of C three-phase; And comprehensively judge at specific electric load phase modulation control unit; Distribution transforming low-pressure side B phase load and low pressure backbone B phase load kick the beam; Caused the uneven balance of distribution transforming low-pressure side three-phase load and low pressure backbone three-phase load, need with A phase branch line 1 and A mutually branch line i go up the B that customer charge is connected to the low pressure backbone and go up mutually, corresponding specific electric load identifies and becomes B by A; Simultaneously also need with C phase branch line 1 and C mutually branch line i go up the B that customer charge is connected to the low pressure backbone and go up mutually, corresponding specific electric load sign becomes B by C, realizes that the online three-phase load of low-voltage network is uneven to administer.
Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although the present invention has been carried out detailed explanation with reference to the foregoing description; Under the those of ordinary skill in field be to be understood that: still can specific embodiments of the invention make amendment or be equal to replacement; And do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1. an online improvement three-phase load unbalanced method that is applicable to low-voltage network is characterized in that said method comprises the steps:
(1) distribution transformer low-pressure side three-phase load monitoring means monitoring three-phase load is big or small, and Monitoring Data is passed to distribution transformer three-phase load degree of unbalance monitoring means;
(2) said distribution transformer three-phase load degree of unbalance monitoring means is judged whether value of being above standard of three-phase load degree of unbalance; If the value of being above standard is then passed to signal at specific electric load phase modulation control unit through downlink communication unit I and uplink communication unit II, otherwise returns step (1);
(3) saidly judge at specific electric load phase modulation control unit whether distribution transformer three-phase load degree of unbalance is caused by low pressure basic routing line three-phase load degree of unbalance; If then the Monitoring Data according to each branch load monitoring unit of low pressure basic routing line three-phase customizes at specific electric load phase modulation strategy; By judging control unit at the specific electric load phase modulation to sending control command, otherwise judge whether each branch's load of other low pressure basic routing line three-phases of distribution transformer exists three-phase load imbalance situation at specific electric load phase modulation diverter switch assembled unit;
(4) said at specific electric load phase modulation diverter switch assembled unit according to said control command to the separate switching of loading of user branch, realize that online improvement three-phase load is uneven.
2. online improvement three-phase load unbalanced method as claimed in claim 1 is characterized in that, each branch's load of low pressure basic routing line three-phase is connected with each phase line of backbone at specific electric load phase modulation diverter switch assembled unit through said; Said is target at specific electric load phase modulation control unit with distribution transformer low-pressure side three-phase load and low pressure backbone three-phrase burden balance, and each branch's load of control three-phase is connected to corresponding phase line, realizes loading and redistributes.
3. online improvement three-phase load unbalanced method as claimed in claim 1 is characterized in that, the real time data of said distribution transformer low-pressure side three-phase load monitoring means monitoring is passed to information management system through uplink communication unit I.
4. online improvement three-phase load unbalanced method as claimed in claim 1; It is characterized in that; The said standard value of step (2) is according to the load management of industry standard SD292 " overhead distribution and equipment operation rules " transformer three-phase load degree of unbalance to be required to set, and its set point is 15%.
5. online improvement three-phase load unbalanced method as claimed in claim 1 is characterized in that, step (4) is said to be connected with user branch on-load switch through each phase branch line terminal board at specific electric load phase modulation diverter switch assembled unit.
6. online improvement three-phase load unbalanced method as claimed in claim 1; It is characterized in that; Step (3) is said judges that at specific electric load phase modulation control unit distribution transformer three-phase load degree of unbalance is according to said distribution transformer low-pressure side three-phase load monitoring means data monitored and low pressure basic routing line three-phase load monitoring means data monitored; If the low-pressure side basic routing line three-phase load imbalance value of being above standard judges that then this low pressure basic routing line three-phase load imbalance is to cause distribution transformer three-phase load reason of unbalanced.
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| CN103337867A (en) * | 2013-06-28 | 2013-10-02 | 国家电网公司 | Low voltage load online phase modulation device and phase modulation method thereof |
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