CN114362123A - Droop control method and system of direct current centralized power supply-distributed power consumption system - Google Patents
Droop control method and system of direct current centralized power supply-distributed power consumption system Download PDFInfo
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Abstract
The invention relates to a droop control method and a droop control system of a direct-current centralized power supply-distributed power consumption system, wherein the droop control method comprises the following steps: acquiring a current value to be output of each adjustable DC/DC module and a resistance value of each connecting line corresponding to each adjustable DC/DC module; calculating expected droop coefficients of the adjustable DC/DC modules based on the current values to be output of the adjustable DC/DC modules; determining the actual droop coefficient of each adjustable DC/DC module according to the expected droop coefficient of each adjustable DC/DC module and the resistance value of each connecting line; and carrying out droop control on the direct current centralized power supply-distributed power consumption system based on the actual droop coefficient of each adjustable DC/DC module. The invention calculates the actual droop coefficient of each adjustable DC/DC module by combining the resistance value of each connecting line, thereby avoiding the over-current condition of the adjustable DC/DC modules, improving the power transmission efficiency of the whole direct current centralized power supply-distributed power consumption system based on multi-DC/DC parallel connection, reducing the loss and ensuring the power supply reliability and the power supply quality.
Description
Technical Field
The invention relates to the technical field of power distribution of a power grid, in particular to a droop control method and system of a direct current centralized power supply-distributed power consumption system.
Background
Along with the increasing variety of consumer electronic products on the user side of the power distribution network, the permeability of wind energy, solar energy and an energy storage system on the power supply side is increased continuously, and the direct current technology is extended from an output layer to a power distribution layer and becomes the development trend of a novel power system gradually.
In a DC distribution network, a plurality of different power sources and loads are generally connected to the same power bus collectively through a DC/DC interface. That is, a DC centralized power supply-distributed power consumption system based on multiple DC/DC parallel connection has appeared. In the above system, the flexibility of power regulation according to DC/DC can be divided into two categories: non-adjustable DC/DC and flexibly adjustable DC/DC. The DC/DC is mainly connected with a load, and the transmission power of the DC/DC cannot be adjusted at will due to the limitation of the connected load power on the DC/DC transmission power; the flexibly adjustable DC/DC mainly refers to the DC/DC connected with a power supply with an energy storage function, and the DC/DC can flexibly adjust the transmission power of the DC/DC according to a system control strategy.
At present, in a direct current centralized power supply-distributed power consumption system based on multiple parallel DC/DC, the most key control target is to realize voltage control of a direct current bus and current control of flexibly adjusting DC/DC, and the traditional control method mainly comprises master-slave control and droop control. Because master-slave control needs the cooperation of a communication system, plug-and-play self-current-sharing control of a multi-DC/DC parallel system cannot be realized generally, and therefore droop control is taken as a preferred scheme of the multi-DC/DC parallel system. However, the conventional droop control for multiple DC/DC parallel systems usually does not consider the influence of the resistance of the connecting lines, so that the actual operation state of the system deviates from the theoretical analysis, and the partial adjustable DC/DC is shut down due to the overcurrent phenomenon, which affects the normal operation of the whole system.
Disclosure of Invention
The invention aims to solve the technical problem of providing a droop control method and system of a direct current centralized power supply-distributed power consumption system aiming at the existing defects.
The technical scheme adopted by the invention for solving the technical problems is as follows: a droop control method of a direct current centralized power supply-distributed power consumption system is constructed, wherein the direct current centralized power supply-distributed power consumption system is a direct current centralized power supply-distributed power consumption system based on multi-DC/DC parallel connection, and the direct current centralized power supply-distributed power consumption system based on multi-DC/DC parallel connection comprises the following steps: a non-adjustable DC/DC unit and an adjustable DC/DC unit providing current to the non-adjustable DC/DC unit; the adjustable DC/DC unit includes: the system comprises a plurality of adjustable DC/DC modules arranged in parallel, wherein each adjustable DC/DC module is connected with a direct current bus through a connecting wire;
the droop control method comprises the following steps:
acquiring a current value to be output of each adjustable DC/DC module and a resistance value of each connecting line corresponding to each adjustable DC/DC module;
calculating expected droop coefficients of each adjustable DC/DC module based on the current value to be output of each adjustable DC/DC module;
determining the actual droop coefficient of each adjustable DC/DC module according to the expected droop coefficient of each adjustable DC/DC module and the resistance value of each connecting line;
and carrying out droop control on the direct current centralized power supply-distributed power consumption system based on the actual droop coefficient of each adjustable DC/DC module.
In the droop control method of the DC centralized power supply-distributed power consumption system according to the present invention, the expected droop coefficient is a droop coefficient of each of the adjustable DC/DC modules under optimization of a loss of its corresponding connection line.
In the droop control method of the dc centralized power supply-distributed power consumption system according to the present invention, the expected droop coefficient satisfies:
in the formula, RiThe resistance value of the ith connecting line in each connecting line; i isiThe current value to be output of the ith adjustable DC/DC module in each adjustable DC/DC module is obtained; kiThe expected droop coefficient of the ith adjustable DC/DC module; vDCi _ initThe voltage value when the output current of the ith adjustable DC/DC module in each adjustable DC/DC module is 0 is obtained; λ is the operator used to compute the extremum for the lagrange number multiplication construct.
In the droop control method of the dc centralized power supply-distributed power consumption system according to the present invention, the expected droop coefficient satisfies:
in the formula, VDCN _ initThe voltage value of the Nth adjustable DC/DC module in the N adjustable DC/DC modules when the output current is 0 is obtained; vDC1_ initThe voltage value of the 1 st adjustable DC/DC module in the N adjustable DC/DC modules when the output current is 0 is obtained; i isiThe current value to be output of the ith adjustable DC/DC module in each adjustable DC/DC module is obtained; k1The expected droop coefficient for the 1 st adjustable DC/DC module; i is the total current value required by the non-adjustable DC/DC unit; i is1The value of the current to be output of the 1 st adjustable DC/DC module.
In the droop control method of the DC centralized power supply-distributed power consumption system according to the present invention, the determining an actual droop coefficient of each adjustable DC/DC module according to an expected droop coefficient of each adjustable DC/DC module in combination with the resistance value of each connection line includes:
obtaining an expected droop coefficient of each adjustable DC/DC module according to the current value to be output of each adjustable DC/DC module;
the expected droop coefficient of each adjustable DC/DC module is differed with the resistance value of the corresponding connecting line, and the difference value of the expected droop coefficient of each adjustable DC/DC module and the resistance value of the corresponding connecting line is obtained;
the difference is the actual droop coefficient for each adjustable DC/DC module.
In the droop control method of the dc centralized power supply-distributed power consumption system according to the present invention, the actual droop coefficient satisfies:
Ki _ true＝Ki-Ri；
In the formula, Ki _ trueThe actual droop coefficient of the ith adjustable DC/DC module; kiThe expected droop coefficient of the ith adjustable DC/DC module; riThe resistance value of the ith connection line.
The invention also provides a droop control system of the direct current centralized power supply-distributed power consumption system, which comprises: an adjustable DC/DC unit, the adjustable DC/DC unit comprising: the system comprises a plurality of adjustable DC/DC modules arranged in parallel, wherein each adjustable DC/DC module is connected with a direct current bus through a connecting wire; further comprising: a control unit;
the control unit is used for:
acquiring a current value to be output of each adjustable DC/DC module and a resistance value of each connecting line corresponding to each adjustable DC/DC module;
calculating expected droop coefficients of each adjustable DC/DC module based on the current value to be output of each adjustable DC/DC module;
determining the actual droop coefficient of each adjustable DC/DC module according to the expected droop coefficient of each adjustable DC/DC module and the resistance value of each connecting line;
and carrying out droop control on the direct current centralized power supply-distributed power consumption system based on the actual droop coefficient of each adjustable DC/DC module.
In the droop control system of the DC centralized power supply-distributed power consumption system according to the present invention, the expected droop coefficient is a droop coefficient of each of the adjustable DC/DC modules under optimization of a loss of its corresponding connection line.
The droop control system of the direct current centralized power supply-distributed power consumption system further comprises: a non-adjustable DC/DC unit connected to the adjustable DC/DC unit;
the non-adjustable DC/DC unit comprises: a plurality of non-adjustable DC/DC modules arranged in parallel;
and each non-adjustable DC/DC module is respectively connected with a load and used for supplying power to the load correspondingly connected with the non-adjustable DC/DC module according to the current provided by the adjustable DC/DC unit.
The invention also provides a direct current centralized power supply-distributed power consumption system which comprises the droop control system of the direct current centralized power supply-distributed power consumption system.
The invention also provides a power supply which comprises the direct current centralized power supply-distributed power consumption system.
The droop control method and the droop control system of the direct current centralized power supply-distributed power consumption system have the following beneficial effects that: acquiring a current value to be output of each adjustable DC/DC module and a resistance value of each connecting line corresponding to each adjustable DC/DC module; calculating expected droop coefficients of the adjustable DC/DC modules based on the current values to be output of the adjustable DC/DC modules; determining the actual droop coefficient of each adjustable DC/DC module according to the expected droop coefficient of each adjustable DC/DC module and the resistance value of each connecting line; and carrying out droop control on the direct current centralized power supply-distributed power consumption system based on the actual droop coefficient of each adjustable DC/DC module. The invention calculates the actual droop coefficient of each adjustable DC/DC module by combining the resistance value of each connecting line, thereby avoiding the over-current condition of the adjustable DC/DC modules, improving the power transmission efficiency of the whole direct current centralized power supply-distributed power consumption system based on multi-DC/DC parallel connection, reducing the loss and ensuring the power supply reliability and the power supply quality.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a topology diagram of a dc centralized power supply-decentralized power consumption system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a droop control system of a dc centralized power supply-distributed power consumption system according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a droop control method of a dc centralized power supply-distributed power consumption system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of output currents of the adjustable DC/DC modules controlled based on the droop control method provided by the embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a topology diagram of a dc centralized power supply-distributed power consumption system provided by the present invention is shown.
Optionally, in the embodiment of the present invention, the DC centralized power supply-distributed power consumption system is a DC centralized power supply-distributed power consumption system based on multiple DC/DC parallel connections.
Specifically, as shown in fig. 1, the DC centralized power supply-distributed power consumption system based on multiple DC/DC parallel connections includes: a non-adjustable DC/DC unit 20, and an adjustable DC/DC unit 10 providing current to the non-adjustable DC/DC unit 20. The adjustable DC/DC unit 10 comprises: a plurality of adjustable DC/DC modules arranged in parallel, each adjustable DC/DC module being connected to the DC bus 40 by a connecting line.
In an embodiment of the present invention, the non-adjustable DC/DC unit 20 comprises a plurality of non-adjustable DC/DC modules arranged in parallel, wherein each non-adjustable DC/DC module is connected to the DC bus 40 through a connection line, and is supplied with current by the adjustable DC/DC unit 10, that is, as shown in fig. 1, each non-adjustable DC/DC module is supplied with current through the DC bus 40 by the adjustable DC/DC unit 10. Each non-adjustable DC/DC module carries out relevant processing and then outputs the processed result to a load correspondingly connected with the module.
As shown in fig. 1, 2, … …, N adjustable DC/DC modules, and 1, 2, … …, m non-adjustable DC/DC modules are provided, and the sum of the currents of the m non-adjustable DC/DC modules is I, so that the total current value required to be provided for droop control of the 1-N adjustable DC/DC modules is I.
Specifically, as shown in FIG. 1, R1Is connected with the 1 st adjustable DC/DC module (DC/DC)1) Resistance value of corresponding connecting line, RiIs connected with the ith adjustable DC/DC module (DC/DC)i) Resistance value of corresponding connecting line, RNTo be adjustable with NthDC/DC module (DC/DC)N) The resistance value of the corresponding connecting line. RN1Is the same as the 1 st non-adjustable DC/DC module (DC/DC)N1) Resistance value of corresponding connecting line, RNmIs the m-th non-adjustable DC/DC module (DC/DC)Nm) The resistance value of the corresponding connecting line. As shown in fig. 1, each adjustable DC/DC module is connected to its corresponding energy storage module, i.e. energy storage module 1 and DC/DC module1Connecting and energy storage module i and DC/DCiConnection … …, energy storage module N and DC/DCNAnd (4) connecting.
Since the non-adjustable DC/DC module cannot adjust its transmission power at will due to the power limitation of the load to which it is connected, in the embodiment of the present invention, droop control is performed on the adjustable DC/DC module.
Based on the direct current centralized power supply-distributed power consumption system based on multi-DC/DC parallel connection shown in FIG. 1, the invention provides a droop control system of the direct current centralized power supply-distributed power consumption system. The droop control system of the direct current centralized power supply-distributed power consumption system considers the influence of the impedance of the connecting line between the adjustable DC/DC module and the direct current bus 40 on the operating characteristics of the adjustable DC/DC module, and the droop control system is regarded as a part of the droop coefficient of each adjustable DC/DC module, so that the overcurrent condition of the adjustable DC/DC module is avoided. Meanwhile, the small-capacity adjustable DC/DC module can be prevented from being fully loaded, and the large-capacity adjustable DC/DC module is still under the condition of light load.
Furthermore, the droop control system takes the minimum loss of the connecting line as an optimization target, determines the droop coefficient (namely the actual droop coefficient) of each adjustable DC/DC module under the condition of considering the impedance of the connecting line, and improves the power transmission efficiency, the power supply reliability and the power supply quality of the whole direct current centralized power supply-distributed power consumption system based on multi-DC/DC parallel connection.
Specifically, as shown in fig. 2, the droop control system of the dc centralized power supply-distributed power consumption system includes: an adjustable DC/DC unit 10, the adjustable DC/DC unit 10 comprising: a plurality of adjustable DC/DC modules arranged in parallel, each adjustable DC/DC module being connected to the DC bus 40 by a connecting line; further comprising: a control unit 30.
Wherein the control unit 30 is configured to: and acquiring the current value to be output of each adjustable DC/DC module and the resistance value of each connecting line corresponding to each adjustable DC/DC module. And calculating the expected droop coefficient of each adjustable DC/DC module based on the current value to be output of each adjustable DC/DC module. And determining the actual droop coefficient of each adjustable DC/DC module according to the expected droop coefficient of each adjustable DC/DC module and the resistance value of each connecting line. And carrying out droop control on the direct current centralized power supply-distributed power consumption system based on the actual droop coefficient of each adjustable DC/DC module.
Further, as shown in fig. 2, the droop control system of the dc centralized power supply-distributed power consumption system further includes: a non-adjustable DC/DC unit 20 connected to the adjustable DC/DC unit 10.
The unregulated DC/DC unit 20 includes: a plurality of non-adjustable DC/DC modules arranged in parallel. Each non-adjustable DC/DC module is connected to a respective load for supplying power to the load connected thereto according to the current provided by the adjustable DC/DC unit 10.
Specifically, as shown in fig. 3, a schematic flow chart of an alternative embodiment of a droop control method adopted by a droop control system of a dc centralized power supply-distributed power consumption system according to an embodiment of the present invention is shown.
As shown in fig. 3, the droop control method of the dc centralized power supply-distributed power consumption system includes:
step S301, obtaining the current value to be output of each adjustable DC/DC module and the resistance value of each connecting line corresponding to each adjustable DC/DC module.
And step S302, calculating expected droop coefficients of the adjustable DC/DC modules based on the current values to be output of the adjustable DC/DC modules.
Optionally, in the embodiment of the present invention, the expected droop coefficient is a droop coefficient of each adjustable DC/DC module under the condition that the loss of the corresponding connection line is optimized.
Specifically, in the embodiment of the present invention, it is expected that the droop coefficient satisfies:
in the formula, RiThe resistance value of the ith connecting line in each connecting line; i isiThe current value to be output of the ith adjustable DC/DC module in each adjustable DC/DC module is obtained; kiThe expected droop coefficient of the ith adjustable DC/DC module; vDCi _ initThe voltage value when the output current of the ith adjustable DC/DC module in each adjustable DC/DC module is 0 is obtained; λ is the operator used to compute the extremum for the lagrange number multiplication construct.
Specifically, since the current to be output (i.e., the current value to be output) of each adjustable DC/DC module can be given by the grid dispatching system, the current value to be output of each adjustable DC/DC module in the equation (1) is known, and meanwhile, the resistance value of each connection line and the voltage value of each adjustable DC/DC module when the output current of each adjustable DC/DC module is 0 are known, the optimal expected droop coefficient of (N-1) adjustable DC/DC modules can be calculated by the equation (1).
Further, in the embodiment of the present invention, it is expected that the droop coefficient also satisfies:
in the formula, VDCN _ initThe voltage value of the Nth adjustable DC/DC module in the N adjustable DC/DC modules when the output current is 0 is obtained; vDC1_ initThe voltage value of the 1 st adjustable DC/DC module in the N adjustable DC/DC modules when the output current is 0 is obtained; i isiThe current value to be output of the ith adjustable DC/DC module in each adjustable DC/DC module is obtained; k1The expected droop coefficient for the 1 st adjustable DC/DC module; i is the total current value required by the unregulated DC/DC unit 20; i is1The value of the current to be output of the 1 st adjustable DC/DC module.
In particular, due to VDCN _ init、VDC1_ init、K1、I1、IiIt is known that the optimum expected droop coefficient of the nth adjustable DC/DC module can be calculated by the equation (2).
And step S303, determining the actual droop coefficient of each adjustable DC/DC module according to the expected droop coefficient of each adjustable DC/DC module and by combining the resistance value of each connecting line.
Optionally, in this embodiment of the present invention, determining the actual droop coefficient of each adjustable DC/DC module according to the expected droop coefficient of each adjustable DC/DC module and by combining the resistance value of each connection line includes: obtaining an expected droop coefficient of each adjustable DC/DC module according to the current value to be output of each adjustable DC/DC module; and subtracting the expected droop coefficient of each adjustable DC/DC module from the resistance value of the corresponding connecting line to obtain the difference value of the expected droop coefficient of each adjustable DC/DC module and the resistance value of the corresponding connecting line.
Wherein the difference is the actual droop coefficient of each adjustable DC/DC module.
Specifically, the actual sag factor satisfies:
Ki _ true＝Ki-Ri(3)。
In the formula, Ki _ trueThe actual droop coefficient of the ith adjustable DC/DC module; kiThe expected droop coefficient of the ith adjustable DC/DC module; riThe resistance value of the ith connection line.
Specifically, the expected droop coefficients of the (N-1) adjustable DC/DC modules are calculated through the formula (1), the expected droop coefficient of the Nth adjustable DC/DC module is calculated through the formula (2), and then the actual droop coefficient of each adjustable DC/DC module can be calculated according to the formula (3).
Specifically, in the embodiment of the present invention, since the expected operating characteristics of each adjustable DC/DC module are different, the currents to be output of each adjustable DC/DC module may be different. Specifically, it can be expressed as:
in the formula, KiFor the expected droop coefficient of the ith adjustable DC/DC module, the actual droop coefficient of each adjustable DC/DC module needs to be determined due to the existence of the connection line resistance during actual operation, and the actual droop coefficient of each adjustable DC/DC module can be determined by equation (3).
Further, (4) each of the formulaeDesired droop coefficient K of adjustable DC/DC moduleiThe calculation principle of (1) is as follows:
after considering the link resistances of the respective DC/DC of the adjustable DC/DC groups, the overall loss of the adjustable DC/DC unit 10 in the multiple parallel DC/DC system (since the power loss of the non-adjustable DC/DC unit 20 is not changed, the power optimization of the adjustable DC/DC unit 10 is the power optimization of the entire multiple DC/DC parallel system) is:
(5) in the formula, PlossIs the overall loss of the adjustable DC/DC unit 10.
Meanwhile, it is understood that the limitation of the formula (5) is:
based on the formula (6):
based on equation (7), the minimum value of equation (5) can be calculated by lagrange multiplication.
Specifically, a lagrangian function is constructed:
wherein, λ is a newly added lagrangian multiplier for calculating the problem of extreme value of boundary condition, and is a variable to be solved. The original variable to be solved is (N-1) independent variables, namely the current I of the first (N-1) adjustable DC/DC modules1、……、IN-1Introducing (N-1) new variables λ (i.e., λ) according to equation (8)1、λ2、……、λN-1) Then, 2(N-1) variables in total of I and λ of formula (8) are sequentially subjected to partial derivative calculation and made to be 0. This is achieved byThe 2(N-1) variables correspond to 2(N-1) equations, which is a necessary condition for solving the equations. Optionally, in an engineering problem similar to the embodiment of the present invention, λ is a real number.
Then, the partial derivative is calculated from equation (8) to obtain:
meanwhile, it can be known that:
substituting the formula (10) into the formula (9) to obtain the formula (1).
It should be noted that the formula (1) includes 2(N-1) formulas, wherein the added Lagrangian factor is (N-1) (i.e. lambda)1、λ2、……、λN-1). Therefore, when the power grid dispatching system sets the current value to be output of each adjustable DC/DC module according to the total required power and the characteristics of each adjustable DC/DC module, the optimal expected droop coefficient of the (N-1) adjustable DC/DC modules can be calculated according to the formula (1), the optimal expected droop coefficient of the Nth adjustable DC/DC module can be calculated according to the formula (2), and the actual droop coefficient of each adjustable DC/DC module can be calculated according to the formula (3).
And S304, performing droop control on the direct current centralized power supply-distributed power consumption system based on the actual droop coefficient of each adjustable DC/DC module.
As shown in fig. 4, by controlling each adjustable DC/DC module by using the droop control method disclosed in the embodiment of the present invention, each adjustable DC/DC module in the adjustable DC/DC unit 10 can be changed according to the desired operation characteristic, so that when the current transmitted to the non-adjustable DC/DC set is I, the system balance is achieved.
According to the invention, the influence of the impedance of each adjustable DC/DC module and the corresponding connecting line on the operating characteristics of the adjustable DC/DC module is considered and equivalent to a part of the droop coefficient of each adjustable DC/DC module, so that the overcurrent condition of the adjustable DC/DC module is effectively avoided.
In addition, the invention also takes the minimum loss of the connecting line as an optimization target, determines the actual droop coefficient of each DC/DC module under the condition of considering the actual impedance of the connecting line, effectively improves the whole power transmission efficiency based on the direct current centralized power supply-distributed power consumption coefficient of the multi-DC/DC parallel connection, and improves the reliability and the quality of power transmission.
In some embodiments, the present invention further provides a power supply, where the power supply may be provided with the dc centralized power supply-distributed power consumption system disclosed in the embodiments of the present invention.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (11)
1. A droop control method of a DC centralized power supply-distributed power consumption system is characterized in that the DC centralized power supply-distributed power consumption system is a DC centralized power supply-distributed power consumption system based on multi-DC/DC parallel connection, and the DC centralized power supply-distributed power consumption system based on multi-DC/DC parallel connection comprises the following steps: a non-adjustable DC/DC unit and an adjustable DC/DC unit providing current to the non-adjustable DC/DC unit; the adjustable DC/DC unit includes: the system comprises a plurality of adjustable DC/DC modules arranged in parallel, wherein each adjustable DC/DC module is connected with a direct current bus through a connecting wire;
the droop control method comprises the following steps:
acquiring a current value to be output of each adjustable DC/DC module and a resistance value of each connecting line corresponding to each adjustable DC/DC module;
calculating expected droop coefficients of each adjustable DC/DC module based on the current value to be output of each adjustable DC/DC module;
determining the actual droop coefficient of each adjustable DC/DC module according to the expected droop coefficient of each adjustable DC/DC module and the resistance value of each connecting line;
and carrying out droop control on the direct current centralized power supply-distributed power consumption system based on the actual droop coefficient of each adjustable DC/DC module.
2. The method according to claim 1, wherein the desired droop factor is a droop factor of each of the adjustable DC/DC modules under optimization of loss of its corresponding connection line.
3. The method according to claim 2, wherein the expected droop coefficient satisfies:
in the formula, RiThe resistance value of the ith connecting line in each connecting line; i isiThe current value to be output of the ith adjustable DC/DC module in each adjustable DC/DC module is obtained; kiThe expected droop coefficient of the ith adjustable DC/DC module; vDCi _ initThe voltage value when the output current of the ith adjustable DC/DC module in each adjustable DC/DC module is 0 is obtained; λ is the operator used to compute the extremum for the lagrange number multiplication construct.
4. The method according to claim 1, wherein the expected droop coefficient satisfies:
in the formula, VDCN _ initThe voltage value of the Nth adjustable DC/DC module in the N adjustable DC/DC modules when the output current is 0 is obtained; vDC1_ initThe voltage value of the 1 st adjustable DC/DC module in the N adjustable DC/DC modules when the output current is 0 is obtained; i isiThe current value to be output of the ith adjustable DC/DC module in each adjustable DC/DC module is obtained; k1The expected droop coefficient for the 1 st adjustable DC/DC module; i is the total current value required by the non-adjustable DC/DC unit; i is1The value of the current to be output of the 1 st adjustable DC/DC module.
5. The method according to claim 1, wherein the determining the actual droop coefficient of each adjustable DC/DC module according to the expected droop coefficient of each adjustable DC/DC module in combination with the resistance value of each connection line comprises:
obtaining an expected droop coefficient of each adjustable DC/DC module according to the current value to be output of each adjustable DC/DC module;
the expected droop coefficient of each adjustable DC/DC module is differed with the resistance value of the corresponding connecting line, and the difference value of the expected droop coefficient of each adjustable DC/DC module and the resistance value of the corresponding connecting line is obtained;
the difference is the actual droop coefficient for each adjustable DC/DC module.
6. The droop control method according to claim 5, wherein the actual droop coefficient satisfies:
Ki _ true＝Ki-Ri；
In the formula, Ki _ trueThe actual droop coefficient of the ith adjustable DC/DC module; kiThe expected droop coefficient of the ith adjustable DC/DC module; riThe resistance value of the ith connection line.
7. A droop control system for a dc centralized power supply-decentralized power consumption system, comprising: an adjustable DC/DC unit, the adjustable DC/DC unit comprising: the system comprises a plurality of adjustable DC/DC modules arranged in parallel, wherein each adjustable DC/DC module is connected with a direct current bus through a connecting wire; further comprising: a control unit;
the control unit is used for:
acquiring a current value to be output of each adjustable DC/DC module and a resistance value of each connecting line corresponding to each adjustable DC/DC module;
calculating expected droop coefficients of each adjustable DC/DC module based on the current value to be output of each adjustable DC/DC module;
determining the actual droop coefficient of each adjustable DC/DC module according to the expected droop coefficient of each adjustable DC/DC module and the resistance value of each connecting line;
and carrying out droop control on the direct current centralized power supply-distributed power consumption system based on the actual droop coefficient of each adjustable DC/DC module.
8. The droop control system according to claim 7, wherein the expected droop coefficient is a droop coefficient of each of the adjustable DC/DC modules at which the corresponding link loss is optimized.
9. The droop control system according to claim 8, further comprising: a non-adjustable DC/DC unit connected to the adjustable DC/DC unit;
the non-adjustable DC/DC unit comprises: a plurality of non-adjustable DC/DC modules arranged in parallel;
and each non-adjustable DC/DC module is respectively connected with a load and used for supplying power to the load correspondingly connected with the non-adjustable DC/DC module according to the current provided by the adjustable DC/DC unit.
10. A dc centralized power supply-distributed power consumption system, comprising the droop control system of the dc centralized power supply-distributed power consumption system according to any one of claims 7 to 9.
11. A power supply comprising the dc centralized power supply-decentralized power consumption system of claim 10.
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