CN112803503B - Load distribution method and device of power supply system - Google Patents
Load distribution method and device of power supply system Download PDFInfo
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- CN112803503B CN112803503B CN202110312557.9A CN202110312557A CN112803503B CN 112803503 B CN112803503 B CN 112803503B CN 202110312557 A CN202110312557 A CN 202110312557A CN 112803503 B CN112803503 B CN 112803503B
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a load distribution method and a device of a power supply system, wherein the method comprises the step that the sum of the power of a direct current load and the power of an alternating current load is more than or equal to P 0 When the power supply is started, n transformers are started simultaneously, each transformer in the first n-1 transformers bears the load capacity of p1, and the nth transformer bears the load capacity of p 2; reducing the load capacity of the first n-1 transformers by a first preset value every first preset time, and adding the reduced total load capacity of the first n-1 transformers to the nth transformer; calculating system efficiency eta after load capacity allocation General assembly (ii) a The system efficiency eta after each load capacity is distributed General assembly Comparison with the previous time, if η Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then the system efficiency eta Total m The corresponding load capacity allocation is determined as the optimal load allocation. The invention realizes the technical effects of automatically optimizing and distributing the load power of the AC/DC hybrid power supply system and maximizing the service efficiency of the power supply system.
Description
Technical Field
The embodiment of the invention relates to the technical field of load distribution, in particular to a load distribution method and device of a power supply system.
Background
With the continuous maturity of power electronic technology, Power Electronic Transformer (PET) equipment developed by applying the power electronic technology is also widely used. The power electronic transformer is used as an energy conversion hub, and the alternating current and direct current hybrid power supply system has many advantages, such as more flexible control, bidirectional energy flow, high energy conversion efficiency, multiple ports, automatic power distribution and the like, and is increasingly popular among power users.
However, the ac-dc hybrid power supply system needs to supply power to the dc load and the ac load at the same time, so that it is difficult to find a balance in power distribution of the transformer, which causes a low use efficiency of the power supply system and a waste of electric energy.
Disclosure of Invention
The invention provides a load distribution method and a load distribution device of a power supply system, and solves the technical problem of low use efficiency of the power supply system caused by difficulty in finding balance of a plurality of transformers in the power supply system in load power distribution when an alternating current and direct current hybrid power supply system supplies power to a direct current load and an alternating current load simultaneously in the prior art.
The embodiment of the invention provides a load distribution method of a power supply system, wherein the power supply system comprises n transformers, n is more than or equal to 2, and the n transformers are electrically connected with a direct current load and an alternating current load in the power supply system; the method comprises the following steps:
a first step of judging whether the sum of the power of the DC load and the power of the AC load is greater than or equal to P 0 Wherein P is 0 The sum of the rated capacities of the first n-1 transformers is multiplied by a first preset percentage;
if yes, simultaneously starting n transformers, and enabling each transformer in the first n-1 transformers to bear the load capacity of p1 and enabling the nth transformer to bear the load capacity of p2, wherein p1 is the product of the rated capacity of each transformer and a second preset percentage, and p2 is the difference value between the sum of the power of the direct current load and the alternating current load and the sum of the load capacities borne by the first n-1 transformers;
a third step of reducing the load capacity borne by each transformer in the first n-1 transformers by a first preset value at intervals of first preset time, and increasing the reduced total load capacity of the first n-1 transformers to the nth transformer;
a fourth step of calculating the system efficiency eta after load capacity allocation General assembly Respectively obtain eta General 1 、η General 2 ……η Total m-1 、η Total m 、η Total m +1 Wherein m is the load capacity distribution times of the transformer;
a fifth step of allocating the system efficiency η after each load capacity allocation General (1) Comparing with the system efficiency after the previous load capacity distribution if eta Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then the system efficiency η Total m The corresponding load capacity allocation is determined as the optimal load allocation.
Further, when the power of the dc load and/or the ac load is increased by a first preset power value, the method further includes:
sequentially adding newly-added load power to the first n-1 transformers from the 1 st transformer, wherein the load capacity borne by each transformer is increased to the product of the rated capacity of the transformer and the second preset percentage;
after the newly added load capacity is added to the power supply system, determining the optimal load distribution after the load power is increased based on the third step, the fourth step and the fifth step.
Further, when the power of the dc load and/or the ac load is reduced by a second preset power value, the method further includes:
a second preset power value for reducing the load capacity of the nth transformer;
determining an optimal load distribution after load power reduction based on the third, fourth and fifth steps.
Further, if the load capacity borne by the nth transformer is equal to the second preset power value, the load capacity of the nth transformer is reduced by the second preset power value and then the nth transformer is shut down for standby.
Further, if the load capacity borne by the nth transformer is smaller than the second preset power value, after the load capacity of the nth transformer is reduced to zero, the load capacity of the (n-1) th transformer is continuously reduced until the value of the reduced load capacity in the power supply system is equal to the second preset power value.
Further, in the fourth step, the system efficiency η after the load capacity allocation is calculated General assembly The method comprises the following steps:
calculating the system efficiency eta by the following formula General assembly ：
Wherein, P #n-380Vac For the power value at the 380Vac port, P, of the nth transformer #n-±375Vdc For the power value at the + -375 Vdc port of the nth transformer, P #n-10KVac And the power value at the 10KVac port of the nth transformer is shown, and n is an integer greater than or equal to 1.
Further, calculating the system efficiency eta General assembly Previously, the method further comprises:
respectively acquiring voltage values and current values at a 380Vac port, a +/-375 Vdc port and a 10KVac port of each transformer;
and calculating the power value at each port based on the acquired voltage value and current value at each port.
Further, if the sum of the power of the direct current load and the alternating current load is less than P 0 And only the first n-1 transformers are started.
Further, when n is 2, a first transformer and a second transformer are included in the power supply system, and the method includes:
judging whether the sum of the power of the direct current load and the power of the alternating current load is greater than or equal to P 0 ；
If yes, simultaneously starting the first transformer and the second transformer, enabling the first transformer to bear the load capacity of p1, and enabling the second transformer to bear the load capacity of p2, wherein p1 is the product of the rated capacity of the first transformer and the second preset percentage, and p2 is the difference between the sum of the power of the direct current load and the power of the alternating current load and p 1;
reducing the load capacity borne by the first transformer by a first preset value every first preset time interval, and adding the reduced load capacity of the first transformer to the second transformer;
calculating system efficiency eta after load capacity allocation General assembly Respectively obtain eta General 1 、η General 2 ……η Total m-1 、η Total m 、η Total m +1 Wherein m is the load capacity distribution frequency of the transformer;
the system efficiency eta after each load capacity allocation General assembly Comparing with the system efficiency after the previous load capacity distribution, if eta Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then the system efficiency η Total m The corresponding load capacity allocation is determined as the optimal load allocation.
An embodiment of the present invention further provides a load distribution device for a power supply system, where the device includes:
a judging unit for judging whether the sum of the power of the DC load and the AC load is greater than or equal to P 0 Wherein, P 0 The sum of the rated capacities of the first n-1 transformers is multiplied by a first preset percentage;
a starting unit, configured to, when a determination result of the determining unit is yes, simultaneously turn on n transformers, and enable each of the first n-1 transformers to bear a load capacity of p1, and enable the nth transformer to bear a load capacity of p2, where p1 is a product of a rated capacity of each transformer itself and a second preset percentage, and p2 is a difference value between a sum of power of the dc load and the ac load and a sum of load capacities borne by the first n-1 transformers;
the load distribution unit is used for reducing the load capacity borne by each transformer in the first n-1 transformers by a first preset value every interval of first preset time, and increasing the total reduced load capacity of the first n-1 transformers to the nth transformer;
a calculation unit for calculating the system efficiency eta after load capacity allocation General (1) Respectively obtain eta General 1 、η General 2 ……η Total m-1 、η Total m 、η Total m +1 Wherein m is the load capacity distribution frequency of the transformer;
a determination unit for allocating the system efficiency eta after each load capacity General assembly Comparing with the system efficiency after the previous load capacity distribution if eta Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then the system efficiency η Total m The corresponding load capacity allocation is determined as the optimal load allocation.
The invention discloses a load distribution method and a device of a power supply system, wherein the method comprises the step of judging whether the sum of the power of a direct current load and the power of an alternating current load is more than or equal to P 0 (ii) a If yes, simultaneously starting n transformers, enabling each transformer in the first n-1 transformers to bear the load capacity of p1, and enabling the nth transformer to bear the load capacity of p 2; reducing the load capacity borne by each transformer in the first n-1 transformers by a first preset value every interval of first preset time, and adding the reduced total load capacity of the first n-1 transformers to the nth transformer; calculating system efficiency eta after load capacity allocation General assembly Respectively obtain eta General 1 、η General 2 ……η Total m-1 、η Total m 、η Total m +1 Wherein m is the load capacity distribution frequency of the transformer; the system efficiency eta after each load capacity distribution General assembly Comparing with the system efficiency after the previous load capacity distribution if eta Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then the system efficiency eta is obtained Total m The corresponding load capacity allocation is determined as the optimal load allocation. The invention solves the problem that the AC-DC hybrid power supply system in the prior art is used as a DC loadWhen the alternating current load supplies power simultaneously, the technical problem of low use efficiency of the power supply system caused by the fact that balance of a plurality of transformers in the power supply system is difficult to find in the distribution of load power is solved, the automatic optimizing distribution of the load power of the alternating current-direct current hybrid power supply system is achieved, and the use efficiency of the power supply system is maximized.
Drawings
Fig. 1 is a flowchart of a load distribution method of a power supply system according to an embodiment of the present invention;
fig. 2 is a structural diagram of an ac/dc hybrid power supply system according to an embodiment of the present invention;
fig. 3 is a flowchart of another load distribution method of a power supply system according to an embodiment of the present invention;
fig. 4 is a structural diagram of a load distribution device of a power supply system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that the terms "first", "second", and the like in the description and claims of the present invention and the drawings are used for distinguishing different objects, and are not used for limiting a specific order. The following embodiments of the present invention may be implemented individually, or may be implemented in combination with each other, and the embodiments of the present invention are not limited in this respect.
The embodiment provides a load distribution method of a power supply system, wherein the power supply system comprises n transformers, n is greater than or equal to 2, and the n transformers are electrically connected with a direct current load and an alternating current load in the power supply system. Fig. 1 is a flowchart of a load distribution method of a power supply system according to an embodiment of the present invention. As shown in fig. 1, the load distribution method of the power supply system specifically includes the following steps:
s101, a first step of judging direct currentWhether the sum of the power of the load and the AC load is greater than or equal to P 0 Wherein P is 0 Is the product of the sum of the rated capacities of the first n-1 transformers and a first preset percentage.
Specifically, when n transformers are arranged in an alternating current-direct current hybrid power supply system, firstly, the power of a direct current load and the power of an alternating current load in the power supply system are respectively obtained, and the power of the direct current load and the power of the alternating current load are added to obtain the total load capacity in the power supply system; then multiplying the sum of the rated capacities of n-1 transformers in the n transformers by a first preset percentage to obtain a capacity value P 0 (ii) a Finally, the sum of the load capacity and the capacity value P 0 Comparing to determine whether the total load capacity is greater than or equal to the capacity value P 0 Namely, whether the n-1 transformers can bear the load capacity before the transformer can be judged. It should be noted that, through experimental verification, for a single power electronic transformer, when the load capacity carried by the transformer is 80% of its rated capacity, the use efficiency of the transformer is the highest, so the first preset percentage may be set to 80%.
S102, if yes, simultaneously starting n transformers, enabling each transformer in the first n-1 transformers to bear the load capacity of p1, and enabling the nth transformer to bear the load capacity of p2, wherein p1 is the product of the rated capacity of each transformer and a second preset percentage, and p2 is the difference value between the sum of the power of the direct current load and the alternating current load and the sum of the load capacities borne by the first n-1 transformers.
In particular, if it is determined that the sum of the capacities of the loads in the power supply system is greater than or equal to the capacity value P 0 If so, it indicates that the n-1 transformers cannot bear the current load capacity in the power supply system, and therefore, the n transformers in the power supply system need to be simultaneously turned on to jointly bear the load in the power supply system.
After n transformers are all started, each transformer in the first n-1 transformers is made to bear the load capacity of p1, and the nth transformer is made to bear the load capacity of p2, so that the load capacity is used as the initial load capacity distribution after the transformers are started. Since the transformer is most efficiently used when the load capacity carried by a single power electronic transformer is 80% of its rated capacity, the second preset percentage may be set to 80% when load capacity allocation is initially performed.
In addition, it should be noted that the n transformers in the power supply system may be transformers with the same rated capacity according to actual needs, or may be transformers with different rated capacities, which is not described herein again. For convenience of description, the embodiments of the present invention are described by taking the case where the rated capacities of n transformers are the same.
S103, in the third step, the load capacity born by each transformer in the first n-1 transformers is reduced by a first preset value at intervals of first preset time, and the reduced total load capacity of the first n-1 transformers is added to the nth transformer.
Specifically, after the initial load capacity allocation is completed, in order to find an optimal load capacity allocation value, the load capacity borne by each transformer in the first n-1 transformers is reduced by a first preset value every a first preset time, the sum of the reduced load capacities of the first n-1 transformers is added to the nth transformer, and the system efficiency of the power supply system is calculated after the load capacity allocation is adjusted each time.
For example, the first preset time may be set to 6 minutes, and the first preset value is set to 5% of the rated capacity of the transformer, after n transformers are turned on and initial load capacity allocation is completed, every 1 minute, the load capacities borne by the first n-1 transformers are all reduced by 5% of the rated capacity, meanwhile, the load capacity borne by the nth transformer is increased, the increased value is equal to the total reduced value of the load capacities borne by the first n-1 transformers, after the load capacity allocation is completed, the system is stabilized by waiting for 5 minutes, and then the system efficiency of the power supply system is calculated. Thereafter, the power supply system reallocates load capacity and calculates system efficiency every 6 minutes until an optimal load allocation for the system is determined.
S104, a fourth step of calculating the system efficiency eta after load capacity distribution General assembly Respectively obtain eta General 1 、η General 2 ……η Total m-1 、η Total m 、η Total m +1 And m is the load capacity distribution frequency of the transformer.
Specifically, after the power supply system performs load capacity allocation each time, the system efficiency η of the power supply system can be adjusted by waiting for the system to be stable General assembly And (6) performing calculation.
Optionally, S104, a fourth step of calculating the system efficiency η after the load capacity allocation General assembly The method comprises the following steps:
calculating the system efficiency eta by the following formula General (1) ：
Wherein, P #n-380Vac For the power value at the 380Vac port of the nth transformer, P #n-±375Vdc Is the power value, P, at the + -375 Vdc port of the nth transformer #n-10KVac The power value at the 10KVac port of the nth transformer is shown, and n is an integer which is greater than or equal to 1.
Optionally, calculating the system efficiency eta General assembly Previously, the method further comprises: respectively obtaining voltage values and current values at a 380Vac port, a +/-375 Vdc port and a 10KVac port of each transformer; and calculating the power value at each port based on the acquired voltage value and current value at each port.
In particular, the system efficiency η is calculated General assembly Firstly, voltage values and current values at 380Vac ports, ± 375Vdc ports and 10KVac ports of each transformer are obtained, then power values at the ports are calculated according to a formula P ═ UI, and finally system efficiency η is calculated according to the power values at the ports General assembly 。
S105, a fifth step of distributing the system efficiency eta after each load capacity General assembly Comparing with the system efficiency after the previous load capacity distribution if eta Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then the system efficiency eta is obtained Total m The corresponding load capacity allocation is determined as the optimal load allocationAnd (4) preparing.
In particular, the system efficiency η after each load capacity allocation General assembly Comparing with the system efficiency after the previous load capacity allocation, if eta Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then, it indicates η Total m The load capacity allocation is the optimal load allocation at the time when the maximum value of the system efficiency is obtained, so that the system efficiency can be optimized.
In the embodiment of the invention, by using the load distribution method of the power supply system, the technical problem of low use efficiency of the power supply system caused by the fact that balance of a plurality of transformers in the power supply system is difficult to find in load power distribution when the alternating current and direct current hybrid power supply system supplies power for a direct current load and an alternating current load simultaneously in the prior art is solved, and the technical effects of automatically optimizing and distributing the load power of the alternating current and direct current hybrid power supply system and maximizing the use efficiency of the power supply system are realized.
Optionally, when the power of the dc load and/or the ac load is increased by the first preset power value, the method further includes: from the 1 st transformer, sequentially adding the newly increased load power to the first n-1 transformers, wherein the load capacity borne by each transformer is increased to the product of the rated capacity of the transformer and a second preset percentage; after the newly added load capacity is added to the power supply system, the optimal load distribution after the load power is increased is determined based on the third step, the fourth step and the fifth step.
Specifically, when the power supply system is in a balanced state, namely the power supply system is in an optimal load distribution, if the load capacity in the power supply system is increased at the moment, the increased value of the load capacity is added to the first n-1 transformers, and the increasing method is that the load capacity borne by each transformer is increased to the product of the rated capacity of each transformer and a second preset percentage in sequence from the 1 st transformer until the increased load capacity is added to the power supply system. Then, according to the method in the third step, the fourth step and the fifth step, the load capacity born by each transformer in the first n-1 transformers is adjusted every other first preset timeThe quantity is reduced by a first preset value, the sum of the load capacities reduced by the first n-1 transformers is added to the nth transformer, the system efficiency of the power supply system is calculated after each load capacity distribution is adjusted, and then the system efficiency eta after each load capacity distribution is calculated General assembly Compare with the system efficiency after the previous load capacity allocation, if eta Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then the system efficiency is η Total m The corresponding load capacity allocation is determined as the optimal load allocation.
It should be noted that the load capacity in the power supply system is increased, the load power of the dc load may be increased by a first preset power value, the load power of the ac load may be increased by a first preset power value, the power of the dc load and the power of the ac load may be simultaneously increased, and the sum of the increased powers is the first preset power value, which is not described herein again.
Optionally, when the power of the dc load and/or the ac load is reduced by the second preset power value, the method further includes: reducing the load capacity of the nth transformer by a second preset power value; and determining the optimal load distribution after the load power is reduced based on the third step, the fourth step and the fifth step.
Specifically, when the power supply system is in a balanced state, that is, when the power supply system is in an optimal load distribution, if the load capacity in the power supply system at this time is reduced, the reduced total load power in the power supply system, that is, the second preset power value, is subtracted from the load capacity borne by the nth transformer. Therefore, the reduced load power is singly reduced from one transformer, and the operation of the power supply system can be kept stable.
Then, according to the method in the third step, the fourth step and the fifth step, the load capacity borne by each transformer in the first n-1 transformers is reduced by a first preset value every other preset time, the sum of the reduced load capacities of the first n-1 transformers is added to the nth transformer, the system efficiency of the power supply system is calculated after each load capacity allocation is adjusted, and then the system efficiency of the power supply system is calculated after each load capacity allocationSystem efficiency η General assembly Comparing with the system efficiency after the previous load capacity allocation, if eta Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then the system efficiency is η Total m The corresponding load capacity allocation is determined as the optimal load allocation.
It should be noted that the load capacity in the power supply system is reduced, the load power of the dc load is reduced by the second preset power value, the load power of the ac load is reduced by the second preset power value, the power of the dc load and the power of the ac load are reduced simultaneously, and the sum of the reduced powers is the second preset power value, which is not described herein again.
Optionally, if the load capacity borne by the nth transformer is equal to the second preset power value, the load capacity of the nth transformer is reduced by the second preset power value and then the nth transformer is shut down for standby.
Specifically, if the reduced total load capacity value in the power supply system, that is, the second preset power value is exactly equal to the load capacity borne by the nth transformer, the load capacity borne by the nth transformer is completely subtracted, that is, the second preset power value is exactly reduced, and at this time, the nth transformer is stopped for standby if no load capacity is borne by the nth transformer, so that the waste that the transformer is started but no load is borne can be avoided.
Optionally, if the load capacity borne by the nth transformer is smaller than the second preset power value, after the load capacity of the nth transformer is reduced to zero, the load capacity of the (n-1) th transformer is continuously reduced until the value of the reduced load capacity in the power supply system is equal to the second preset power value.
Specifically, if the load capacity carried by the nth transformer in the power supply system does not reach the reduction value of the load power in the power supply system after being completely subtracted, that is, the load capacity borne by the nth transformer is smaller than the second preset power value, after the load capacity of the nth transformer is reduced to zero and the nth transformer is shut down for standby, the load capacity of the (n-1) th transformer is continuously reduced until the value of the load capacity reduced from the power supply system is equal to the second preset power value. In the process of reducing the load capacity, if the load capacity carried on a certain transformer is reduced to zero, the transformer is stopped for standby, and waste is avoided.
Obviously, after subtracting the second preset power value from the transformer, the capacity allocation balance in the power supply system is broken, and therefore it is necessary to find the balance again from the new transformer which is currently still on. Assuming that q transformers are still in operation, according to the method in the third step, the fourth step and the fifth step, reducing the load capacity borne by each transformer in the first q-1 transformers by a first preset value every other preset time, simultaneously adding the reduced load capacity sum of the first q-1 transformers to the q-th transformer, calculating the system efficiency of the power supply system after each load capacity allocation adjustment, and then calculating the system efficiency eta after each load capacity allocation General assembly Compare with the system efficiency after the previous load capacity allocation, if eta Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then the system efficiency is η Total m And determining the corresponding load capacity distribution as the optimal load distribution, wherein m is the distribution times of the load capacity.
Optionally, if the sum of the power of the DC load and the AC load is less than P 0 And only the front n-1 transformers are started.
Specifically, if it is determined that the sum of the load capacities in the power supply system is less than the capacity value P after step S101 is performed 0 If so, the n-1 transformers can bear the current load capacity in the power supply system, so that the n transformers in the power supply system do not need to be started simultaneously, and the load in the power supply system can be borne only by starting the front n-1 transformers. The optimal load distribution is then found in the first n-1 transformers using the methods in the third, fourth and fifth steps described above.
Fig. 2 is a structural diagram of an ac/dc hybrid power supply system according to an embodiment of the present invention. For example, when only n is 2, only 2 transformers are provided in the power supply system, that is, only the first transformer # 1 and the second transformer # 2 are provided in the power supply system.
Referring to fig. 2, the power supply system includes a circuit breaker 11, a 10kVac # 1 bus, a first transformer # 1, a circuit breaker 12, and a circuit breaker 13; a breaker 21, a 10kVac # 2 bus, a second transformer # 2, a breaker 22, and a breaker 23; 380Vac bus and alternating current load Lac; a + -375 Vdc bus, a dc load Ldc.
As shown in fig. 2, the 380Vac bus is connected to an ac load Lac, and the 375Vdc bus is connected to a dc load Ldc. The first and second transformers # 1 and #2 each have three ports, which are 10kVac ports, 380Vac ports, and ± 375Vdc ports, respectively. The 380Vac port of the first transformer # 1 is connected with an electric load bus 380Vac bus through a breaker 12, the +/-375 Vdc port is connected with an electric load bus +/-375 Vdc bus through a breaker 13, the 10kVac port is connected with a power supply load bus 10kVac # 1 bus, and the 10kVac # 1 bus is connected with the power grid side through a breaker 11; the 380Vac port of the second transformer # 2 is connected to the electric load bus 380Vac bus via the breaker 22, the ± 375Vdc port is connected to the electric load bus ± 375Vdc bus via the breaker 23, the 10kVac port is connected to the electric supply load bus 10kVac # 2 bus, and the 10kVac # 2 bus is connected to the grid side via the breaker 21.
In the three ports of each transformer, bidirectional flow of energy can be realized between any two ports, namely, electric energy can flow from the 10kVac port to the 380Vac port and can also flow in the reverse direction; the electric energy can flow from the 10kVac port to the +/-375 Vdc port and can also flow in the reverse direction; the power can flow from the 380Vac port to the +/-375 Vdc port and can also flow reversely.
The circuit breakers 11, 12, 22, 21 are ac circuit breakers and have a function of connecting and disconnecting a normal current in an ac circuit and a function of disconnecting a fault ac current. The circuit breakers 13, 23 are dc circuit breakers having a function of connecting and disconnecting a normal current in a dc circuit and a function of disconnecting a fault dc current.
It should be noted that the 10kVac # 1 bus and the 10kVac # 2 bus are derived from two power supplies, and therefore, when any one of the first transformer # 1 and the second transformer # 2 fails and stops operating, power supply of the power load is not affected, and power supply reliability is improved.
Fig. 3 is a flowchart of another load distribution method of a power supply system according to an embodiment of the present invention.
Alternatively, as shown in fig. 2 and 3, when n is 2, the power supply system includes a first transformer # 1 and a second transformer # 2. The load distribution method of the power supply system specifically comprises the following steps:
s301, judging whether the sum of the power of the direct current load and the power of the alternating current load is more than or equal to P 0 。
Specifically, when 2 transformers, namely a first transformer and a second transformer, are arranged in the alternating current and direct current hybrid power supply system, firstly, the power of a direct current load and the power of an alternating current load in the power supply system are respectively obtained, and the power of the direct current load and the power of the alternating current load are added to obtain the sum of the load capacities in the power supply system; then, the rated capacity of the first transformer is multiplied by a first preset percentage to obtain a capacity value P 0 (ii) a Finally, the sum of the load capacity and the capacity value P 0 Comparing to determine whether the total load capacity is greater than or equal to the capacity value P 0 That is, it is determined whether the first transformer can support the load capacity before the first transformer can support the load capacity. It should be noted that, through experimental verification, when the load capacity of a single power electronic transformer is 80% of its rated capacity, the use efficiency of the transformer is the highest, so the first preset percentage may be set to 80%.
And S302, if yes, simultaneously starting the first transformer and the second transformer, enabling the first transformer to bear the load capacity of p1, and enabling the second transformer to bear the load capacity of p2, wherein p1 is the product of the rated capacity of the first transformer and a second preset percentage, and p2 is the difference between the sum of the power of the direct current load and the power of the alternating current load and p 1.
Specifically, if it is determined that the sum of the load capacities in the power supply system is less than the capacity value P 0 If so, the first transformer can bear the current load capacity in the power supply system, so that the first transformer is only required to be started; if the load capacity in the power supply system is determinedThe sum of the quantities being greater than or equal to the capacity value P 0 It means that the first transformer cannot bear the current load capacity in the power supply system, and therefore 2 transformers in the power supply system need to be turned on simultaneously to share the load in the power supply system.
After 2 transformers are all started, the first transformer is enabled to bear the load capacity of p1, and the second transformer is enabled to bear the load capacity of p2, so that the load capacity is distributed as the initial load capacity after the transformers are started, wherein the sum of p1 and p2 is equal to the sum of the load capacities in the power supply system. Since the transformer is most efficiently used when the load capacity of a single power electronic transformer is 80% of its rated capacity, the second preset percentage may be set to 80% when the load capacity is initially allocated.
And S303, reducing the load capacity borne by the first transformer by a first preset value at intervals of first preset time, and adding the reduced load capacity of the first transformer to the second transformer.
Specifically, after the initial load capacity allocation is completed, in order to find an optimal load capacity allocation value, the load capacity borne by the first transformer is reduced by a first preset value every first preset time, the reduced load capacity of the first transformer is added to the second transformer, and the system efficiency of the power supply system is calculated after the load capacity allocation is adjusted each time.
For example, the first preset time may be set to 6 minutes, and the first preset value may be set to 5% of the rated capacity of the transformer itself, after the transformer is turned on and initial load capacity allocation is completed, the load capacity borne by the first transformer is decreased by 5% of the rated capacity, and at the same time, the load capacity borne by the second transformer is increased by a value equal to the decreased capacity value of the first transformer, and after the load capacity allocation is completed, the system is stabilized by waiting for 5 minutes, and then the system efficiency of the power supply system is calculated. Thereafter, the power supply system reallocates load capacity and calculates system efficiency every 6 minutes until an optimal load allocation for the system is determined.
S304, calculating the system efficiency eta after load capacity distribution General assembly Respectively obtain eta General 1 、η General 2 ……η Total m-1 、η Total m 、η Total m +1 And m is the load capacity distribution frequency of the transformer.
Specifically, taking first transformer # 1 as an example, the calculation formula of the efficiency value for a single power electronic transformer is as follows:
wherein, the power values of the P #1-10KVac, the P #1-380Vac and the P #1- + -375 Vdc are respectively the power values at the 10KVac port, the 380Vac port and the + -375 Vdc port of the first transformer # 1.
Accordingly, the system efficiency η of the power supply system having 2 transformers can be calculated by the following formula General assembly ：
Wherein, P #1-10kVac, P #1-380Vac and P #1- + -375 Vdc are power values at a 10KVac port, a 380Vac port and a + -375 Vdc port of the first transformer # 1 respectively; p #2-10KVac, P #2-380Vac and P #2- + -375 Vdc are the power values at the 10KVac port, 380Vac port and + -375 Vdc port of the second transformer # 2, respectively.
S305, distributing the system efficiency eta after each load capacity General assembly Comparing with the system efficiency after the previous load capacity distribution if eta Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then the system efficiency eta Total m The corresponding load capacity allocation is determined as the optimal load allocation.
In particular, the system efficiency η after each load capacity allocation General assembly Compare with the system efficiency after the previous load capacity allocation, if eta Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then, it indicates η Total m The load capacity allocation is the optimal load allocation at the time when the maximum value of the system efficiency is obtained, so that the system efficiency can be optimized.
Optionally, when the power of the dc load and/or the ac load is increased by the first preset power value, the method further includes: adding the newly added load power into the first transformer first until the load capacity borne by the first transformer is increased to the product of the rated capacity of the first transformer and a second preset percentage, and then adding the rest newly added load power into the second transformer; after the newly added load power is added to the power supply system, the optimal load distribution after the load power is increased is determined based on the methods in the third step, the fourth step and the fifth step.
Specifically, when the power supply system is in a balanced state, that is, when the power supply system is in an optimal load distribution, if the load power in the power supply system is increased at this time, the increased value of the load power is loaded into the first transformer first until the load capacity borne by the first transformer is increased to the product of the rated capacity of the first transformer and a second preset percentage, and then the remaining newly increased load power is increased into the second transformer. Then, according to the method in the third step, the fourth step and the fifth step, the load capacity borne by the first transformer is reduced by a first preset value every first preset time, the reduced load capacity of the first transformer is added to the second transformer, the system efficiency of the power supply system is calculated after each load capacity allocation is adjusted, and then the system efficiency η after each load capacity allocation is calculated General (1) Comparing with the system efficiency after the previous load capacity allocation, if eta Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then the system efficiency is η Total m The corresponding load capacity allocation is determined as the optimal load allocation.
Optionally, when the power of the dc load and/or the ac load is reduced by the second preset power value, the method further includes: a second preset power value for reducing the load capacity of the second transformer; and determining the optimal load distribution after the load power is reduced based on the third step, the fourth step and the fifth step.
In particular, when the power supply system is in a balanced state, i.e. the power supply system is at an optimal load distribution, the reduced total load power is reduced from the second transformer if the load capacity in the power supply system at that time is reduced. Then, according to the method in the third step, the fourth step and the fifth step, the load capacity borne by the first transformer is reduced by a first preset value every first preset time, the reduced load capacity of the first transformer is added to the second transformer, the system efficiency of the power supply system is calculated after each load capacity allocation is adjusted, and then the system efficiency η after each load capacity allocation is calculated General assembly Compare with the system efficiency after the previous load capacity allocation, if eta Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then the system efficiency is η Total m The corresponding load capacity allocation is determined as the optimal load allocation.
Optionally, if the load capacity borne by the second transformer is equal to a second preset power value, the second transformer is shut down for standby after the load capacity of the second transformer is reduced by the second preset power value.
Specifically, if the reduced total load capacity value in the power supply system, that is, the second preset power value is exactly equal to the load capacity borne by the second transformer, the load capacity borne by the second transformer is completely subtracted, that is, the second preset power value is exactly subtracted, and at this time, the second transformer is stopped for standby, so that the waste that the transformer is started but does not bear a load can be avoided.
Optionally, if the load capacity borne by the second transformer is smaller than the second preset power value, after the load capacity of the second transformer is reduced to zero, the load capacity of the first transformer is continuously reduced until the value of the reduced load capacity from the power supply system is equal to the second preset power value.
Specifically, if the load capacity carried by the second transformer in the power supply system does not reach the reduction value of the load power in the power supply system after being completely subtracted, that is, the load capacity borne by the second transformer is smaller than the second preset power value, after the load capacity in the second transformer is reduced to zero and the second transformer is shut down for standby, the load capacity of the first transformer continues to be reduced until the value of the load capacity reduced from the power supply system is equal to the second preset power value.
In the embodiment of the invention, by using the load distribution method of the power supply system, the technical problem of low use efficiency of the power supply system caused by the fact that a plurality of transformers in the power supply system are difficult to find balance in load power distribution when the alternating current and direct current hybrid power supply system supplies power to a direct current load and an alternating current load simultaneously in the prior art is solved, and the technical effects of automatically optimizing and distributing the load power of the alternating current and direct current hybrid power supply system and maximizing the use efficiency of the power supply system are realized.
The embodiment of the present invention further provides a load distribution device of a power supply system, where the load distribution device of the power supply system is configured to execute the load distribution method of the power supply system provided in the above embodiment of the present invention, and the load distribution device of the power supply system provided in the embodiment of the present invention is specifically described below.
Fig. 4 is a structural diagram of a load distribution device of a power supply system according to an embodiment of the present invention, and as shown in fig. 4, the load distribution device of the power supply system mainly includes: a judging unit 41, a starting unit 42, a load distributing unit 43, a calculating unit 44 and a determining unit 45, wherein:
a judging unit 41 for judging whether the sum of the powers of the DC load and the AC load is greater than or equal to P 0 Wherein P is 0 Is the product of the sum of the rated capacities of the first n-1 transformers and a first preset percentage.
And the starting unit 42 is used for simultaneously starting n transformers when the judgment result of the judgment unit is yes, enabling each transformer in the first n-1 transformers to bear the load capacity of p1, and enabling the nth transformer to bear the load capacity of p2, wherein p1 is the product of the rated capacity of each transformer and a second preset percentage, and p2 is the difference value between the sum of the power of the direct current load and the alternating current load and the sum of the load capacities borne by the first n-1 transformers.
And the load distribution unit 43 is used for reducing the load capacity borne by each transformer in the first n-1 transformers by a first preset value every first preset time interval, and adding the reduced total load capacity of the first n-1 transformers to the nth transformer.
A calculation unit 44 for calculating the system efficiency eta after load capacity allocation General assembly Respectively obtain eta General 1 、η General 2 ……η Total m-1 、η Total m 、η Total m +1 And m is the load capacity distribution frequency of the transformer.
A determination unit 45 for allocating the system efficiency eta after each load capacity General assembly Comparing with the system efficiency after the previous load capacity distribution if eta Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then the system efficiency eta Total m The corresponding load capacity allocation is determined as the optimal load allocation.
Optionally, the load distributing unit 43 is further configured to: when the power of the direct current load and/or the alternating current load is increased by a first preset power value, starting from the 1 st transformer, sequentially adding the newly increased load power to the first n-1 transformers, wherein the load capacity borne by each transformer is increased to the product of the rated capacity of each transformer and a second preset percentage; after the newly added load capacity is added to the power supply system in its entirety, the optimal load distribution after the load power increase is re-determined by the load distribution unit 43, the calculation unit 44 and the determination unit 45.
Optionally, the load distributing unit 43 is further configured to: when the power of the direct current load and/or the alternating current load is reduced by a second preset power value, reducing the load capacity of the nth transformer by the second preset power value; after the reduced load capacity is all reduced from the power supply system, the optimal load distribution after the load power reduction is re-determined by the load distribution unit 43, the calculation unit 44 and the determination unit 45.
Optionally, the starting unit 42 is further configured to: and if the load capacity borne by the nth transformer is equal to the second preset power value, stopping the machine for standby after the load capacity of the nth transformer is reduced by the second preset power value.
Optionally, the load distributing unit 43 is further configured to: if the load capacity born by the nth transformer is smaller than the second preset power value, the load capacity of the nth transformer is reduced to zero, and then the load capacity of the (n-1) th transformer is continuously reduced until the value of the load capacity reduced from the power supply system is equal to the second preset power value.
Optionally, the calculation unit 44 is specifically configured to calculate the system efficiency η by the following formula General assembly ：
Wherein, P #n-380Vac For the power value at the 380Vac port of the nth transformer, P #n-±375Vdc For the power value at the + -375 Vdc port of the nth transformer, P #n-10KVac The power value at the 10KVac port of the nth transformer is shown, and n is an integer which is greater than or equal to 1.
Optionally, the apparatus further comprises:
an acquisition unit for calculating the system efficiency eta at the calculation unit 44 General assembly Previously, the voltage value and the current value at the 380Vac port, ± 375Vdc port and 10KVac port of each transformer were obtained respectively.
And the power calculation unit is used for calculating the power value at each port based on the voltage value and the current value at each port acquired by the acquisition unit.
Optionally, the starting unit 42 is further configured to start when the sum of the power of the dc load and the ac load is less than P 0 And only the front n-1 transformers are started.
The device provided by the embodiment of the present invention has the same implementation principle and technical effect as the method embodiments, and for the sake of brief description, reference may be made to the corresponding contents in the method embodiments without reference to the device embodiments.
The load distribution method of the power supply system provided by the embodiment of the invention has the same technical characteristics as the load distribution device of the power supply system provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The load distribution method of the power supply system is characterized in that the power supply system comprises n transformers, wherein n is more than or equal to 2, and the n transformers are electrically connected with a direct current load and an alternating current load in the power supply system; the method comprises the following steps:
a first step of judging whether the sum of the power of the direct current load and the power of the alternating current load is greater than or equal to P 0 Wherein P is 0 The sum of the rated capacities of the first n-1 transformers is multiplied by a first preset percentage;
if yes, simultaneously starting n transformers, and enabling each transformer in the first n-1 transformers to bear the load capacity of p1 and enabling the nth transformer to bear the load capacity of p2, wherein p1 is the product of the rated capacity of each transformer and a second preset percentage, and p2 is the difference value between the sum of the power of the direct current load and the alternating current load and the sum of the load capacities borne by the first n-1 transformers;
a third step of reducing the load capacity borne by each transformer in the first n-1 transformers by a first preset value at intervals of first preset time, and increasing the reduced total load capacity of the first n-1 transformers to the nth transformer;
a fourth step of calculating the system efficiency eta after load capacity allocation General assembly Respectively obtain eta General 1 、η General 2 ……η Total m-1 、η Total m 、η Total m +1 Wherein m is the load capacity distribution frequency of the transformer;
a fifth step of allocating the system efficiency η after each load capacity allocation General assembly Comparing with the system efficiency after the previous load capacity distribution if eta Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then the system efficiency η Total m The corresponding load capacity allocation is determined as the optimal load allocation.
2. The method according to claim 1, wherein when the power of the dc load and/or the ac load is increased by a first preset power value, the method further comprises:
adding newly increased load power to the first n-1 transformers in sequence from the 1 st transformer, wherein the load capacity borne by each transformer is increased to the product of the rated capacity of the transformer and the second preset percentage;
after the newly added load capacity is added to the power supply system, determining the optimal load distribution after the load power is increased based on the third step, the fourth step and the fifth step.
3. The method according to claim 1, wherein when the power of the dc load and/or the ac load is reduced by a second preset power value, the method further comprises:
a second preset power value for reducing the load capacity of the nth transformer;
determining an optimal load distribution after load power reduction based on the third, fourth and fifth steps.
4. The method of claim 3, wherein if the load capacity of the nth transformer is equal to the second predetermined power value, the load capacity of the nth transformer is decreased by the second predetermined power value and then is shut down for standby.
5. The method according to claim 3, wherein if the load capacity of the nth transformer is less than the second predetermined power value, the load capacity of the nth transformer is reduced to zero, and then the load capacity of the (n-1) th transformer is reduced continuously until the value of the reduced load capacity from the power supply system is equal to the second predetermined power value.
6. The method according to claim 1, wherein said fourth step of calculating a system efficiency η after load capacity allocation General assembly The method comprises the following steps:
calculating the system efficiency eta by the following formula General assembly ：
Wherein, P #n-380Vac For the power value at the 380Vac port of the nth transformer, P #n-±375Vdc For the power value at the + -375 Vdc port of the nth transformer, P #n-10KVac And n is an integer which is greater than or equal to 1 and is the power value at the 10KVac port of the nth transformer.
7. The method of claim 6, wherein the step of removing the metal oxide layer comprises removing the metal oxide layer from the metal oxide layerIn that the system efficiency eta is calculated General assembly Previously, the method further comprises:
respectively acquiring voltage values and current values at a 380Vac port, a +/-375 Vdc port and a 10KVac port of each transformer;
and calculating the power value at each port based on the acquired voltage value and current value at each port.
8. The method of claim 1, wherein if the sum of the power of the DC load and the AC load is less than P 0 And only the front n-1 transformers are started.
9. The method of claim 1, wherein when n-2, a first transformer and a second transformer are included in the power supply system, the method comprising:
judging whether the sum of the power of the direct current load and the power of the alternating current load is greater than or equal to P 0 ；
If yes, simultaneously starting the first transformer and the second transformer, enabling the first transformer to bear the load capacity of p1, and enabling the second transformer to bear the load capacity of p2, wherein p1 is the product of the rated capacity of the first transformer and the second preset percentage, and p2 is the difference value between the sum of the power of the direct current load and the power of the alternating current load and p 1;
reducing the load capacity borne by the first transformer by a first preset value every first preset time interval, and adding the reduced load capacity of the first transformer to the second transformer;
calculating system efficiency eta after load capacity allocation General assembly Respectively obtain eta General 1 、η General 2 ……η Total m-1 、η Total m 、η Total m +1 Wherein m is the load capacity distribution frequency of the transformer;
the system efficiency after each load capacity allocation eta General assembly Comparing with the system efficiency after the previous load capacity distribution, if eta Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then the system efficiency η Total m The corresponding load capacity allocation is determined as the optimal load allocation.
10. A load distribution apparatus of a power supply system, the apparatus comprising:
a judging unit for judging whether the sum of the power of the DC load and the AC load is greater than or equal to P 0 Wherein P is 0 The sum of the rated capacities of the first n-1 transformers is multiplied by a first preset percentage;
a starting unit, configured to, when a determination result of the determining unit is yes, simultaneously turn on n transformers, and enable each of the first n-1 transformers to bear a load capacity of p1, and enable the nth transformer to bear a load capacity of p2, where p1 is a product of a rated capacity of each transformer itself and a second preset percentage, and p2 is a difference value between a sum of power of the dc load and the ac load and a sum of load capacities borne by the first n-1 transformers;
the load distribution unit is used for reducing the load capacity borne by each transformer in the first n-1 transformers by a first preset value every interval of first preset time, and increasing the total reduced load capacity of the first n-1 transformers to the nth transformer;
a calculation unit for calculating the system efficiency eta after load capacity allocation General assembly Respectively obtain eta General 1 、η General 2 ……η Total m-1 、η Total m 、η Total m +1 Wherein m is the load capacity distribution times of the transformer;
a determination unit for allocating the system efficiency eta after each load capacity General (1) Comparing with the system efficiency after the previous load capacity distribution if eta Total m-1 ≤η Total m And η Total m ≥η Total m +1 Then the system efficiency η is calculated Total m The corresponding load capacity allocation is determined as the optimal load allocation.
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