CN111293698A - Distributed energy and user alternating current-direct current system management and control method considering operation margin - Google Patents
Distributed energy and user alternating current-direct current system management and control method considering operation margin Download PDFInfo
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- CN111293698A CN111293698A CN202010187494.4A CN202010187494A CN111293698A CN 111293698 A CN111293698 A CN 111293698A CN 202010187494 A CN202010187494 A CN 202010187494A CN 111293698 A CN111293698 A CN 111293698A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
Abstract
The invention provides a distributed energy and user alternating current and direct current system management and control method considering operation margin, which comprises the following steps: initializing an alternating current-direct current system to obtain an initial characteristic value; updating the power value of each control unit, comparing the power value with the initial characteristic value, and calculating to obtain the operation margin coefficient of each control unit; and thirdly, generating an adjusting instruction of each control unit under the condition of considering the operation margin according to the operation margin coefficient of each control unit and the scheduling power. The method of the invention obtains the operation margin coefficient of each control unit, and combines the scheduling power to pointedly generate the adjusting instruction of each control unit under the consideration of the operation margin, can share the scheduling power instruction as much as possible, and ensures the stable operation of the system.
Description
Technical Field
The invention relates to the field of distributed energy, in particular to a distributed energy and user alternating current and direct current system management and control method considering operation margin.
Background
With the rapid development and wide application of new energy, new materials and power electronic technologies, the requirements of users on power supply quality, reliability, operation efficiency and the like are increasingly improved, and the existing distributed energy and user alternating current and direct current systems face huge challenges in various aspects such as diversified power consumption requirements, large-scale access of distributed renewable energy, complicated trend coordination control and the like.
Alternating current and direct current power distribution becomes one of the important forms of future power distribution, wherein a converter station at one end adopts constant direct current voltage control and serves as a main station to provide constant direct current voltage support for a direct current network, and direct current loads such as electric vehicles/LEDs can be connected to a direct current bus. And the rest converter stations adopt constant active power control and receive power scheduling to become corresponding control units.
When direct current loads of the electric automobile/LED and the like are increased or reduced, a superior dispatching mechanism issues corresponding dispatching power to the distributed energy and the user alternating current and direct current system to balance load fluctuation through decision, and each management and control unit jointly decomposes the dispatching power instruction under the condition of ensuring the stability of the system. The electrical structure of a distributed energy source and a user alternating current and direct current system is shown in fig. 1.
The variable subscripts m, s1, s2 and dc respectively represent physical quantities of the master station, the control unit 1, the control unit 2 and the direct current bus equivalent load. Um and im respectively represent direct-current voltage and direct current of the master station, Us1, is1, Cs1 and P1 respectively represent direct-current voltage, direct current, direct-current side capacitance and current power of the management and control unit 1, Us2, is2, Cs2 and P2 respectively represent direct-current voltage, direct current, direct-current side capacitance and current power of the management and control unit 2, and Udc, idc, Cdc and Pdc respectively represent direct-current voltage, direct current, direct-current side capacitance and current power of the direct-current bus. rm is the resistance of the line impedance of the master station, rs1 is the resistance of the line impedance of the management and control unit 1, rs2 is the resistance of the line impedance of the management and control unit 2, Lm is the reactance of the line impedance of the master station, Ls1 is the reactance of the line impedance of the management and control unit 1, and Ls2 is the reactance of the line impedance of the management and control unit 2. The distributed energy and the circuit corresponding to the user alternating current and direct current system meet the following requirements:
the small signal variation is denoted by Δ.
The distributed energy and the circuit corresponding to the user alternating current and direct current system are expressed in a matrix form, and then a system model can be obtained:
dΔx/dt＝AΔx
Δ x is a system state vector, specifically [ Δ im,Δis1,Δis2,ΔUdc,ΔUs1,ΔUs2]TAnd A is the system state matrix:
when the load of the direct current bus fluctuates, each control unit can adopt an intelligent control method to share the scheduling power instruction together and ensure the stability of the system.
The initial value of the dc voltage of the dc bus, the initial value of the dc voltage of the management and control unit 1, and the initial value of the dc voltage of the management and control unit 2 are respectively. At present, the technology also has the problems of slow speed for solving the A matrix, limited scheduling range, delayed scheduling instruction and the like when an alternating current-direct current system is complex.
Disclosure of Invention
In order to solve the problems, the invention obtains the operation margin coefficient of each control unit through the proposed distributed energy and user alternating current and direct current system control method considering the operation margin, and generates the adjusting instruction of each control unit considering the operation margin in a targeted manner by combining the scheduling power, so that the scheduling power instruction can be shared as much as possible, and the stable operation of the system is ensured.
The invention provides a distributed energy and user alternating current and direct current system control method considering operation margin, wherein the system comprises a main station and a plurality of control units, and the method comprises the following steps:
initializing an alternating current-direct current system to obtain an initial characteristic value;
updating the power value of each control unit, comparing the power value with the initial characteristic value, and calculating to obtain the operation margin coefficient of each control unit;
and thirdly, generating an adjusting instruction of each control unit under the condition of considering the operation margin according to the operation margin coefficient of each control unit and the scheduling power.
Further, in the first step, the initialization process is as follows:
(1.1) establishing an alternating current-direct current system small signal model d delta x/dt ═ A delta x, wherein delta x is a system state vector, and A is a system state matrix;
(1.2) solving the A matrix to obtain N initial characteristic roots, wherein the nth initial characteristic root is lambdao nExpressed as: lambda [ alpha ]o n＝σo n+jωo nWhere the superscript o denotes the initial value, σo nRepresenting the real part, ω, of the nth initial feature rooto nThe imaginary part of the nth initial characteristic root is represented, and j represents an imaginary unit;
(1.3) determining σo 1，σo 2，σo n，…，σo NMaximum value of (1) is σo max。
Further, the second step of updating the power value of each management and control unit, comparing the power value with the initial characteristic value, and calculating and obtaining the operation margin coefficient of each management and control unit specifically includes:
(2.1) assume that the system has J management and control units, PjIs the current power of the jth management and control unit, Pj,ratedIs the rated capacity, P, of the jth management and control unitj,avaIs the available capacity of the jth management unit, PcomIs P1,rated,…,Pj,rated,…,PJ,ratedCommon divisor of (c), setting FjSetting y for the flag bit of jth management and control unitjSetting the operation margin coefficient of the jth management and control unitF is fixednAn operation margin coefficient factor for the nth characteristic root; setting j to 1;
(2.2)Pj＝Pj+Pcomupdating the system state matrix A, and solving the system state matrix A to obtain N characteristic roots and the nth characteristic root lambdanExpressed as: lambda [ alpha ]n＝σn+jωn；σnRepresenting the real part of the n-th root of the feature, ωnThe imaginary part of the nth characteristic root is represented, and j represents an imaginary unit;
(2.3) determining σ1，σ2，σn，…，σNMaximum value of (1) is σmax,
If σ ismax>σo maxSet up Fj＝1；
Starting from the 1 st feature root to the Nth feature root, if sigma isn>σo maxAnd then:
fn＝1+|(σn-σo max)/(σo n)|；
otherwise fn＝|(σn-σo n)/(σo n)|；
Finally calculate yj＝f1+…+fn+…fN；
If σ ismax≤σo maxSet up Fj＝0；
Starting from the 1 st feature root to the Nth feature root,
fn＝|(σn-σo n)/(σo n)|
finally calculate yj＝f1+…+fn+…fN；
(2.4) if J equals J, then step two is exited, otherwise J equals J +1, and then step (2.2) is returned.
Further, in the third step, according to the operation margin coefficient of each management and control unit, in combination with the scheduling power, an adjustment instruction of each management and control unit under consideration of the operation margin is generated, which specifically includes the following steps:
(3.1) if power fluctuation occurs, setting the corresponding scheduling power received by the distributed energy source and the user alternating current-direct current system as P, and setting a temporary variable Y as max (Y)1，…yj…yJ) At this time, d is setjRepresents the relative sensitivity factor of the jth gate control unit, then dj＝yj/Y；
(3.2) setting Pj,refThe scheduling adjustment quantity of the jth management and control unit is shown, when P is more than or equal to 0, namely the system needs to absorb power,
Pj,ref＝min(P*(dj)2/∑(dj)2，Pj,ava)；
when P <0, i.e. the system requires output power,
Pj,ref＝max(P*(1-(dj)2/∑(dj)2)，-Pj,ava)。
advantageous effects
Alternating current-direct current distribution will become an important form of future distribution, and through the coordinated control between the multiterminal, the system will have power sharing ability and the power supply ability of wider scope, and the control unit in the make full use of system can realize the steady operation of power fluctuation lower system, and then promotes the rapid development of distributed energy and user alternating current-direct current system technique. Therefore, the invention provides a distributed energy and user alternating current and direct current system control method considering the operation margin, effectively solves the problems of system power imbalance and direct current voltage instability caused by load fluctuation, fills up the blank of the related technology, and has wide application prospect.
Drawings
FIG. 1 is a block diagram of a distributed energy and user AC/DC system;
fig. 2 is a flow chart of a distributed energy resource and user ac/dc system management and control method of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art based on the embodiments of the present invention belong to the protection scope of the present invention without creative efforts.
According to an embodiment of the present invention, the present invention provides a method for managing and controlling a distributed energy resource and a user ac/dc system in consideration of an operation margin, where the system includes a master station and a plurality of management and control units, and referring to fig. 1, the method includes the following steps:
initializing an alternating current-direct current system to obtain an initial characteristic value;
updating the power value of each control unit, comparing the power value with the initial characteristic value, and calculating to obtain the operation margin coefficient of each control unit;
and thirdly, generating an adjusting instruction of each control unit under the condition of considering the operation margin according to the operation margin coefficient of each control unit and the scheduling power.
In the first step, the initialization process is as follows:
(1.1) establishing an alternating current-direct current system small signal model d delta x/dt ═ A delta x, wherein delta x is a system state vector, and A is a system state matrix;
(1.2) solving the A matrix to obtain N initial characteristic roots, wherein the nth initial characteristic root is lambdao nExpressed as: lambda [ alpha ]o n＝σo n+jωo nWhere the superscript o denotes the initial value, σo nRepresenting the real part, ω, of the nth initial feature rooto nThe imaginary part of the nth initial characteristic root is represented, and j represents an imaginary unit;
(1.3) determining σo 1，σo 2，σo n，…，σo NMaximum value of (1) is σo max。
Further, the second step of updating the power value of each management and control unit, comparing the power value with the initial characteristic value, and calculating and obtaining the operation margin coefficient of each management and control unit specifically includes:
(2.1) assume that the system has J management and control units, PjIs the current power of the jth management and control unit, Pj,ratedIs the rated capacity, P, of the jth management and control unitj,avaIs the available capacity of the jth management unit, PcomIs P1,rated,…,Pj,rated,…,PJ,ratedCommon divisor of (c), setting FjSetting y for the flag bit of jth management and control unitjSetting f for operation margin coefficient of jth management and control unitnAn operation margin coefficient factor for the nth characteristic root; setting j to 1;
(2.2)Pj＝Pj+Pcomupdating the system state matrix A, and solving the system state matrix A to obtain N characteristic roots and the nth characteristic root lambdanExpressed as: lambda [ alpha ]n＝σn+jωn；σnRepresenting the real part of the n-th root of the feature, ωnThe imaginary part of the nth characteristic root is represented, and j represents an imaginary unit;
(2.3) determining σ1，σ2，σn，…，σNMaximum value of (1) is σmax,
If σ ismax>σo maxSet up Fj＝1；
Starting from the 1 st feature root to the Nth feature root, if sigma isn>σo maxAnd then:
fn＝1+|(σn-σo max)/(σo n)|；
otherwise fn＝|(σn-σo n)/(σo n)|；
Finally calculate yj＝f1+…+fn+…fN；
If σ ismax≤σo maxSet up Fj＝0；
Starting from the 1 st feature root to the Nth feature root,
fn＝|(σn-σo n)/(σo n)|
finally calculate yj＝f1+…+fn+…fN；
(2.4) if J equals J, then step two is exited, otherwise J equals J +1, and then step (2.2) is returned.
In the third step, according to the operation margin coefficient of each control unit, in combination with the scheduling power, an adjustment instruction of each control unit under consideration of the operation margin is generated, which specifically includes the following steps:
(3.1) if power fluctuation occurs, setting the corresponding scheduling power received by the distributed energy source and the user alternating current-direct current system as P, and setting a temporary variable Y as max (Y)1，…yj…yJ) At this time, d is setjRepresents the relative sensitivity factor of the jth gate control unit, then dj＝yj/Y；
(3.2) setting Pj,refThe scheduling adjustment quantity of the jth management and control unit is shown, when P is more than or equal to 0, namely the system needs to absorb power,
Pj,ref＝min(P*(dj)2/∑(dj)2，Pj,ava)；
when P <0, i.e. the system requires output power,
Pj,ref＝max(P*(1-(dj)2/∑(dj)2)，-Pj,ava)。
although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but various changes may be apparent to those skilled in the art, and it is intended that all inventive concepts utilizing the inventive concepts set forth herein be protected without departing from the spirit and scope of the present invention as defined and limited by the appended claims.
Claims (4)
1. A distributed energy and user alternating current and direct current system management and control method considering operation margins is provided, the system comprises a main station and a plurality of management and control units, and the method is characterized by comprising the following steps:
initializing an alternating current-direct current system to obtain an initial characteristic value;
updating the power value of each control unit, comparing the power value with the initial characteristic value, and calculating to obtain the operation margin coefficient of each control unit;
and thirdly, generating an adjusting instruction of each control unit under the condition of considering the operation margin according to the operation margin coefficient of each control unit and the scheduling power.
2. The method for managing and controlling the distributed energy resource and the user alternating current and direct current system according to claim 1, wherein in the first step, an initialization process is as follows:
(1.1) establishing an alternating current-direct current system small signal model d delta x/dt ═ A delta x, wherein delta x is a system state vector, and A is a system state matrix;
(1.2) solving the A matrix to obtain N initial characteristic roots, wherein the nth initial characteristic root is lambdao nExpressed as: lambda [ alpha ]o n＝σo n+jωo nWhere the superscript o denotes the initial value, σo nRepresenting the real part, ω, of the nth initial feature rooto nThe imaginary part of the nth initial characteristic root is represented, and j represents an imaginary unit;
(1.3) determining σo 1，σo 2，σo n，…，σo NMaximum value of (1) is σo max。
3. The method according to claim 1, wherein the step two of updating the power value of each control unit, comparing the power value with the initial characteristic value, and calculating and obtaining the operation margin coefficient of each control unit specifically includes:
(2.1) assume that the system has J management and control units, PjIs the current power of the jth management and control unit, Pj,ratedIs the rated capacity, P, of the jth management and control unitj,avaIs the jthAvailable capacity of the policing unit, PcomIs P1,rated,…,Pj,rated,…,PJ,ratedCommon divisor of (c), setting FjSetting y for the flag bit of jth management and control unitjSetting f for operation margin coefficient of jth management and control unitnAn operation margin coefficient factor for the nth characteristic root; setting j to 1;
(2.2)Pj＝Pj+Pcomupdating the system state matrix A, and solving the system state matrix A to obtain N characteristic roots and the nth characteristic root lambdanExpressed as: lambda [ alpha ]n＝σn+jωn；σnRepresenting the real part of the n-th root of the feature, ωnThe imaginary part of the nth characteristic root is represented, and j represents an imaginary unit;
(2.3) determining σ1，σ2，σn，…，σNMaximum value of (1) is σmax,
If σ ismax>σo maxSet up Fj＝1；
Starting from the 1 st feature root to the Nth feature root, if sigma isn>σo maxAnd then:
fn＝1+|(σn-σo max)/(σo n)|；
otherwise fn＝|(σn-σo n)/(σo n)|；
Finally calculate yj＝f1+…+fn+…fN；
If σ ismax≤σo maxSet up Fj＝0；
Starting from the 1 st feature root to the Nth feature root,
fn＝|(σn-σo n)/(σo n)|
finally calculate yj＝f1+…+fn+…fN；
(2.4) if J equals J, then step two is exited, otherwise J equals J +1, and then step (2.2) is returned.
4. The method for managing and controlling the distributed energy resource and the user alternating current and direct current system according to claim 1, wherein the method comprises the following steps:
in the third step, according to the operation margin coefficient of each control unit, in combination with the scheduling power, an adjustment instruction of each control unit under consideration of the operation margin is generated, which specifically includes the following steps:
(3.1) if power fluctuation occurs, setting the corresponding scheduling power received by the distributed energy source and the user alternating current-direct current system as P, and setting a temporary variable Y as max (Y)1，…yj…yJ) At this time, d is setjRepresents the relative sensitivity factor of the jth gate control unit, then dj＝yj/Y；
(3.2) setting Pj,refThe scheduling adjustment quantity of the jth management and control unit is shown, when P is more than or equal to 0, namely the system needs to absorb power,
Pj,ref＝min(P*(dj)2/∑(dj)2，Pj,ava)；
when P <0, i.e. the system requires output power,
Pj,ref＝max(P*(1-(dj)2/∑(dj)2)，-Pj,ava)。
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