CN116436073A - Parameter configuration method and system for preventing continuous low voltage ride through of distributed new energy - Google Patents
Parameter configuration method and system for preventing continuous low voltage ride through of distributed new energy Download PDFInfo
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
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Abstract
The invention discloses a parameter configuration method and a system for preventing continuous low voltage ride through of distributed new energy, and an electric power system model containing the distributed new energy is established; establishing mathematical expression of low-voltage ride through control of the distributed new energy; the power system model of the distributed new energy is expressed to contain a distributed new energy Thevenin equivalent form, and a power system flow equation during low voltage ride through of the distributed new energy is established based on the distributed new energy Thevenin equivalent form; solving a power flow equation of the power system to obtain a group of solutions which maximize apparent load power in all the solutions; substituting the largest solution into a new energy current equation to obtain the new energy current; substituting the expected new energy current into the mathematical expression of the distributed new energy low voltage ride through control to determine the parameters of the distributed new energy low voltage ride through control. The invention prevents the distributed new energy from entering a continuous low voltage ride through state after grid-connected operation by configuring the control parameters of the distributed new energy.
Description
Technical Field
The invention relates to the technical field of distributed new energy low voltage ride through control, in particular to a parameter configuration method and system for preventing continuous low voltage ride through of distributed new energy.
Background
In recent years, distributed new energy power generation represented by roof photovoltaics is in explosive growth in China, and becomes an important structural feature of an electric power system.
After the power system fails, the distributed new energy is likely to enter a low-voltage ride-through state, and the low-voltage ride-through state is continuously maintained after the voltage of the large power grid is recovered, so that the large power grid is off-grid, and the safe operation of the large power grid is threatened.
Therefore, it is necessary to reasonably configure the control parameters of the distributed new energy source to avoid entering the continuous low voltage ride through state.
Disclosure of Invention
The technical scheme of the invention provides a parameter configuration method and a system for preventing continuous low voltage ride through of a distributed new energy source, which are used for solving the problem of how to perform parameter configuration for preventing continuous low voltage ride through of the distributed new energy source.
In order to solve the above problems, the present invention provides a parameter configuration method for preventing continuous low voltage ride through of a distributed new energy, the method comprising:
establishing an electric power system model containing distributed new energy sources;
establishing a mathematical expression of the distributed new energy low voltage ride through control of the power system model of the distributed new energy;
the power system model of the distributed new energy is expressed to contain a Thevenin equivalent form of the distributed new energy, and a power system flow equation during low voltage ride through of the distributed new energy is established based on the Thevenin equivalent form of the distributed new energy;
solving the power flow equation of the power system to obtain a group of solutions which maximize the apparent load power in all the solutions;
substituting the maximum solution into a new energy current equation to obtain a new energy current;
substituting the expected new energy current into the mathematical expression of the distributed new energy low voltage ride through control to determine the parameters of the distributed new energy low voltage ride through control.
Preferably, the mathematical expression of the distributed new energy low voltage ride through control is:
I P ＝K P1 V t +K P2 I P0 +I Pset
I Q ＝K Q1 (V L -V t )+I Qset
wherein I is P An active current instruction for representing the low voltage ride through period of new energy, I Q Reactive current instruction for representing new energy low voltage ride through period, I P0 Representing the active current before the new energy enters the low voltage ride through, V t Machine end voltage of new energy source, V L Threshold voltage K representing new energy entering low voltage ride through P1 To control parameter 1, K P2 To control parameter 2, I Pset To control parameter 3, K Q1 To control parameter 4, I Qset For the control parameter 5.
Preferably, the power system flow equation during the low voltage ride through of the distributed new energy is:
V L cosα POC ＝E eq cosα eq -I s Z eq cos(α s +α eq )
V L sinα POC ＝E eq sinα eq -I s Z eq sin(α s +α eq )
wherein I is s For the total current effective value of the distribution network consumption, alpha s For the total current phase angle consumed by the distribution network, S LD In order for the apparent load power to be the same,
for the load power factor angle, alpha POC Is the voltage phase angle of the grid-connected point of the equivalent new energy, I RES Is the effective value of new energy current, alpha DRE Z is the phase angle of the new energy current c For reactive compensation accommodation, E eq Is the effective value of the equivalent voltage source of the large power grid, alpha eq Is the equivalent voltage source phase angle of a large power grid, Z eq Is the equivalent impedance module value of the large power grid.
Preferably, the desired new energy current equation is:
I P ＝I DRE cos(α POC -α DRE )
I Q ＝I DRE sin(α POC -α DRE )
wherein I is DRE The effective value of the new energy current.
Preferably, the solving the power system power flow equation, obtaining a set of solutions that maximize apparent load power from all solutions, includes:
at alpha DRE E [ -pi, pi) interval.
Based on another aspect of the present invention, the present invention provides a parameter configuration system for preventing continuous low voltage ride through of a distributed new energy, the system comprising:
the building unit is used for building a power system model containing distributed new energy sources; establishing a mathematical expression of the distributed new energy low voltage ride through control of the power system model of the distributed new energy; the power system model of the distributed new energy is expressed to contain a Thevenin equivalent form of the distributed new energy, and a power system flow equation during low voltage ride through of the distributed new energy is established based on the Thevenin equivalent form of the distributed new energy;
the execution unit is used for solving the power flow equation of the power system and obtaining a group of solutions which maximize the apparent load power in all the solutions; substituting the maximum solution into a new energy current equation to obtain a new energy current;
and the result unit is used for substituting the expected new energy current into the mathematical expression of the distributed new energy low voltage ride through control to determine the parameters of the distributed new energy low voltage ride through control.
Preferably, the mathematical expression of the distributed new energy low voltage ride through control is:
I P ＝K P1 V t +K P2 I P0 +I Pset
I Q ＝K Q1 (V L -V t )+I Qset
wherein I is P An active current instruction for representing the low voltage ride through period of new energy, I Q Reactive current instruction for representing new energy low voltage ride through period, I P0 Representing the active current before the new energy enters the low voltage ride through, V t Machine end voltage of new energy source, V L Threshold voltage K representing new energy entering low voltage ride through P1 To control parameter 1, K P2 To control parameter 2, I Pset To control parameter 3, K Q1 To control parameter 4, I Qset For the control parameter 5.
Preferably, the power system flow equation during the low voltage ride through of the distributed new energy is:
V L cosα POC ＝E eq cosα eq -I s Z eq cos(α s +α eq )
V L sinα POC ＝E eq sinα eq -I s Z eq sin(α s +α eq )
wherein I is s For the total current effective value of the distribution network consumption, alpha s For the total current phase angle consumed by the distribution network, S LD In order for the apparent load power to be the same,
for the load power factor angle, alpha POC Is the voltage phase angle of the grid-connected point of the equivalent new energy, I RES Is the effective value of new energy current, alpha DRE Z is the phase angle of the new energy current c For reactive compensation accommodation, E eq Is the effective value of the equivalent voltage source of the large power grid, alpha eq Is the equivalent voltage source phase angle of a large power grid, Z eq Is the equivalent impedance module value of the large power grid.
Preferably, the desired new energy current equation is:
I P ＝I DRE cos(α POC -α DRE )
I Q ＝I DRE sin(a POC -α DRE )
wherein I is DRE The effective value of the new energy current.
Preferably, the solving the power system power flow equation, obtaining a set of solutions that maximize apparent load power from all solutions, includes:
at alpha DRE E [ -pi, pi) interval.
The technical scheme of the invention provides a parameter configuration method and a system for preventing continuous low voltage ride through of distributed new energy, wherein the method comprises the following steps: establishing an electric power system model containing distributed new energy sources; establishing a mathematical expression of low-voltage ride through control of the distributed new energy of the power system model of the distributed new energy; the power system model of the distributed new energy is expressed to contain a distributed new energy Thevenin equivalent form, and a power system flow equation during low voltage ride through of the distributed new energy is established based on the distributed new energy Thevenin equivalent form; solving a power flow equation of the power system to obtain a group of solutions which maximize apparent load power in all the solutions; substituting the largest solution into a new energy current equation to obtain the new energy current; substituting the expected new energy current into the mathematical expression of the distributed new energy low voltage ride through control to determine the parameters of the distributed new energy low voltage ride through control. The technical scheme of the invention realizes reasonable configuration of the control parameters of the distributed new energy, and avoids the continuous low-voltage ride through state after grid-connected operation.
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Exemplary embodiments of the present invention may be more completely understood in consideration of the following drawings:
FIG. 1 is a flow chart of a parameter configuration method for preventing continuous low voltage ride through of a distributed new energy source according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a power system model of a distributed new energy source according to a preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of a distributed new energy source Thevenin equivalent form according to a preferred embodiment of the present invention; and
fig. 4 is a diagram illustrating a configuration of a parameter configuration system for preventing continuous low voltage ride through of a distributed new energy according to a preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flowchart of a parameter configuration method for preventing continuous low voltage ride through of a distributed new energy according to a preferred embodiment of the present invention. Because the existing distributed new energy low voltage ride through control has no reasonable configuration method, the distributed new energy low voltage ride through control can enter a continuous low voltage ride through state after grid-connected operation, and then the distributed new energy low voltage ride through control is off-grid, so that the safe operation of a power system is threatened. The invention assists power grid operation analysts or distributed new energy equipment manufacturers to reasonably configure control parameters of the distributed new energy, and avoid entering a continuous low voltage ride through state after grid-connected operation.
As shown in fig. 1, the present invention provides a parameter configuration method for preventing continuous low voltage ride through of a distributed new energy, the method comprising:
step 101: establishing an electric power system model containing distributed new energy sources;
the invention proceeds from step 101: and establishing a power system model containing the distributed new energy, as shown in figure 2. RES in the figure represents a distributed new energy source. And determining model parameters according to the actual conditions of the system.
Step 102: establishing a mathematical expression of low-voltage ride through control of the distributed new energy of the power system model of the distributed new energy;
preferably, the mathematical expression of the distributed new energy low voltage ride through control is:
I P ＝K P1 V t +K P2 I P0 +I Pset
I Q ＝K Q1 (V L -V t )+I Qse t
wherein I is P An active current instruction for representing the low voltage ride through period of new energy, I Q Reactive current instruction for representing new energy low voltage ride through period, I P0 Representing the active current before the new energy enters the low voltage ride through, V t Machine end voltage of new energy source, V L Threshold voltage K representing new energy entering low voltage ride through P1 To control parameter 1, K P2 To control parameter 2, I Pset To control parameter 3, K Q1 To control parameter 4, I Qset For the control parameter 5.
The invention proceeds to step 102: and establishing a mathematical expression form of the low voltage ride through control of the distributed new energy, wherein the mathematical expression form is shown in formulas (1) - (2).
I P ＝K P1 V t +K P2 I P0 +I Pset (1)
I Q ＝K Q1 (V L -V t )+I Qset (2)
Wherein I is P An active current instruction for representing the low voltage ride through period of new energy, I Q Reactive current instruction for representing new energy low voltage ride through period, I P0 Representing the active current before the new energy enters the low voltage ride through, V t Machine end voltage of new energy source, V L The new energy enters the threshold voltage of low voltage ride through, and other variables are distributed new energy control parameters which need to be configured. When the low voltage ride through state is not entered, the new energy source is approximately considered a constant power source.
Step 103: the power system model of the distributed new energy is expressed to contain a distributed new energy Thevenin equivalent form, and a power system flow equation during low voltage ride through of the distributed new energy is established based on the distributed new energy Thevenin equivalent form;
preferably, the power system flow equation during distributed new energy low voltage ride through is:
V L cosα POC ＝E eq cosα eq -I s Z eq cos(α s +α eq )
V L sinα POC ＝E eq sinα eq -I s Z eq sin(α s +α eq )
wherein I is s For the total current effective value of the distribution network consumption, alpha s For the total current phase angle consumed by the distribution network, S LD In order for the apparent load power to be the same,
for the load power factor angle, alpha POC Is the voltage phase angle of the grid-connected point of the equivalent new energy, I RES Is the effective value of new energy current, alpha DRE Z is the phase angle of the new energy current c For reactive compensation accommodation, E eq Is the effective value of the equivalent voltage source of the large power grid, alpha eq Is the equivalent voltage source phase angle of a large power grid, Z eq Is the equivalent impedance module value of the large power grid.
The invention proceeds to step 103: the power system model in the step 101 is expressed as the equivalent form containing the distributed new energy source Thevenin shown in fig. 3, and a power system tide equation during the low voltage ride through of the distributed new energy source is established as shown in the formulas (3) - (6). The physical meaning of the variables in the formula are noted in FIG. 3.
V L cosα POC ＝E eq cosα eq -I s Z eq cos(α s +α eq ) (5)
V L sinα POC ＝E eq sinα eq -I s Z eq sin(α s +α eq ) (6)
Step 104: solving a power flow equation of the power system to obtain a group of solutions which maximize apparent load power in all the solutions;
preferably, solving the power system power flow equation to obtain a set of solutions that maximize apparent load power from all solutions includes:
at alpha DRE E [ -pi, pi) interval.
The invention proceeds to step 104: will I S ，α S ，S LD ，α POC As an unknown, at alpha DRE E [ -pi, pi) interval solving equation sets (5) - (6), and takingS in all solutions LD A largest set of solutions.
Step 105: substituting the largest solution into a new energy current equation to obtain the new energy current;
preferably, the desired new energy current equation is:
I P ＝I DRE cos(α POC -α DRE )
I Q ＝I DRE sin(α POC -α DRE )
wherein I is DRE The effective value of the new energy current.
The invention proceeds to step 105: substituting the solution obtained in the step 104 into equations (7) - (8), and calculating to obtain the expected new energy current I P 、I Q
I P ＝I DRE cos(α POC -α DRE ) (7)
I Q ＝I DRE sin(α POC -α DRE ) (8)
Step 106: substituting the expected new energy current into the mathematical expression of the distributed new energy low voltage ride through control to determine the parameters of the distributed new energy low voltage ride through control.
The invention proceeds to step 106: i obtained in step 105 P 、I Q Substituting equations (1) - (2) to formulate a distributed new energy control parameter that achieves the desired current in step 105.
The embodiment of the invention assists power grid operation analysts or distributed new energy equipment manufacturers to reasonably configure control parameters of distributed new energy, and avoid entering a continuous low-voltage ride through state after grid-connected operation.
As shown in fig. 4, the present invention provides a parameter configuration system for preventing continuous low voltage ride through of distributed new energy, the system comprising:
a building unit 401, configured to build a power system model including distributed new energy sources; establishing a mathematical expression of low-voltage ride through control of the distributed new energy of the power system model of the distributed new energy; the power system model of the distributed new energy is expressed to contain a distributed new energy Thevenin equivalent form, and a power system flow equation during low voltage ride through of the distributed new energy is established based on the distributed new energy Thevenin equivalent form;
preferably, the mathematical expression of the distributed new energy low voltage ride through control is:
I P ＝K P1 V t +K P2 I P0 +I Pset
I Q ＝K Q1 (V L -V t )+I Qset
wherein I is P An active current instruction for representing the low voltage ride through period of new energy, I Q Reactive current instruction for representing new energy low voltage ride through period, I P0 Representing the active current before the new energy enters the low voltage ride through, V t Machine end voltage of new energy source, V L Threshold voltage K representing new energy entering low voltage ride through P1 To control parameter 1, K P2 To control parameter 2, I Pset To control parameter 3, K Q1 To control parameter 4, I Qset For the control parameter 5.
Preferably, the power system flow equation during distributed new energy low voltage ride through is:
V L cosα POC ＝E eq cosα eq -I s Z eq cos(α s +α eq )
V L sinα POC ＝E eq sinα eq -I s Z eq sin(α s +α eq )
wherein I is s For the total current effective value of the distribution network consumption, alpha s For the total current phase angle consumed by the distribution network, S LD In order for the apparent load power to be the same,
for the load power factor angle, alpha POC Is the voltage phase angle of the grid-connected point of the equivalent new energy, I RES Is the effective value of new energy current, alpha DRE Z is the phase angle of the new energy current c For reactive compensation accommodation, E eq Is the effective value of the equivalent voltage source of the large power grid, alpha eq Is the equivalent voltage source phase angle of a large power grid, Z eq Is the equivalent impedance module value of the large power grid.
An execution unit 402, configured to solve a power flow equation of the power system, and obtain a set of solutions that maximize apparent load power in all solutions; substituting the largest solution into a new energy current equation to obtain the new energy current;
preferably, solving the power system power flow equation to obtain a set of solutions that maximize apparent load power from all solutions includes:
at alpha DRE E [ -pi, pi) interval.
Preferably, the desired new energy current equation is:
I P ＝I DRE cos(α POC -α DRE )
I Q ＝I DRE sin(α POC -α DRE )
wherein I is DRE The effective value of the new energy current.
And a result unit 403, configured to substitute the desired new energy current into the mathematical expression of the distributed new energy low voltage ride through control, and determine the parameters of the distributed new energy low voltage ride through control.
The invention provides a parameter configuration system for preventing continuous low voltage ride through of a distributed new energy, which corresponds to the parameter configuration method for preventing continuous low voltage ride through of a distributed new energy, and is not described herein.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the invention can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
The invention has been described with reference to a few embodiments. However, as is well known to those skilled in the art, other embodiments than the above disclosed invention are equally possible within the scope of the invention, as defined by the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a/an/the [ means, component, etc. ]" are to be interpreted openly as referring to at least one instance of said means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (10)
1. A parameter configuration method for preventing continuous low voltage ride through of a distributed new energy source, the method comprising:
establishing an electric power system model containing distributed new energy sources;
establishing a mathematical expression of the distributed new energy low voltage ride through control of the power system model of the distributed new energy;
the power system model of the distributed new energy is expressed to contain a Thevenin equivalent form of the distributed new energy, and a power system flow equation during low voltage ride through of the distributed new energy is established based on the Thevenin equivalent form of the distributed new energy;
solving the power flow equation of the power system to obtain a group of solutions which maximize the apparent load power in all the solutions;
substituting the maximum solution into a new energy current equation to obtain a new energy current;
substituting the expected new energy current into the mathematical expression of the distributed new energy low voltage ride through control to determine the parameters of the distributed new energy low voltage ride through control.
2. The method of claim 1, wherein the mathematical expression of the distributed new energy low voltage ride through control is:
I P ＝K P1 V t +K P2 I P0 +I Pset
I Q ＝K Q1 (V L -V t )+I Qset
wherein I is P An active current instruction for representing the low voltage ride through period of new energy, I Q Reactive current instruction for representing new energy low voltage ride through period, I P0 Representing the active current before the new energy enters the low voltage ride through, V t Machine end voltage of new energy source, V L Threshold voltage K representing new energy entering low voltage ride through P1 To control parameter 1, K P2 To control parameter 2, I Pset To control parameter 3, K Q1 To control parameter 4, I Qset For the control parameter 5.
3. The method of claim 2, the power system flow equation during the distributed new energy low voltage ride through being:
V L cosα POC ＝E eq cosα eq -I s Z eq cos(α s +α eq )
V L sinα POC ＝E eq sinα eq -I s Z eq sin(α s +α eq )
wherein I is s For the total current effective value of the distribution network consumption, alpha s For the total current phase angle consumed by the distribution network, S LD In order for the apparent load power to be the same,
for the load power factor angle, alpha POC Is the voltage phase angle of the grid-connected point of the equivalent new energy, I RES Is the effective value of new energy current, alpha DRE Z is the phase angle of the new energy current c For reactive compensation accommodation, E eq Is the effective value of the equivalent voltage source of the large power grid, alpha eq Is the equivalent voltage source phase angle of a large power grid, Z eq Is the equivalent impedance module value of the large power grid.
4. The method of claim 3, wherein the desired new energy current equation is:
I P ＝I DRE cos(α POC -α DRE )
I Q ＝I DRE sin(α POC -α DRE )
wherein the method comprises the steps of，I DRE Is the effective value of the new energy current.
5. A method according to claim 3, said solving the power system flow equation to obtain a set of solutions that maximize apparent load power from all solutions, comprising:
at alpha DRE E [ -pi, pi) interval.
6. A parameter configuration system for preventing continuous low voltage ride through of a distributed new energy source, the system comprising:
the building unit is used for building a power system model containing distributed new energy sources; establishing a mathematical expression of the distributed new energy low voltage ride through control of the power system model of the distributed new energy; the power system model of the distributed new energy is expressed to contain a Thevenin equivalent form of the distributed new energy, and a power system flow equation during low voltage ride through of the distributed new energy is established based on the Thevenin equivalent form of the distributed new energy;
the execution unit is used for solving the power flow equation of the power system and obtaining a group of solutions which maximize the apparent load power in all the solutions; substituting the maximum solution into a new energy current equation to obtain a new energy current;
and the result unit is used for substituting the expected new energy current into the mathematical expression of the distributed new energy low voltage ride through control to determine the parameters of the distributed new energy low voltage ride through control.
7. The system of claim 6, the mathematical expression of the distributed new energy low voltage ride through control is:
I P ＝K P1 V t +K P2 I P0 +I Pset
I Q ＝K Q1 (V L -V t )+I Qset
wherein I is P An active current instruction for representing the low voltage ride through period of new energy, I Q Reactive current instruction for representing new energy low voltage ride through period, I P0 Representing the active current before the new energy enters the low voltage ride through, V t Machine end voltage of new energy source, V L Threshold voltage K representing new energy entering low voltage ride through P1 To control parameter 1, K P2 To control parameter 2, I Pset To control parameter 3, K Q1 To control parameter 4, I Qset For the control parameter 5.
8. The system of claim 7, the power system flow equation during the distributed new energy low voltage ride through being:
V L cosα POC ＝E eq cosα eq -I s Z eq cos(α s +α eq )
V L sinα POC ＝E eq sinα eq -I s Z eq sin(α s +α eq )
wherein I is s For the total current effective value of the distribution network consumption, alpha s For the total current phase angle consumed by the distribution network, S LD In order for the apparent load power to be the same,
for the load power factor angle, alpha POC Is the voltage phase angle of the grid-connected point of the equivalent new energy, I RES Is the effective value of new energy current, alpha DRE Z is the phase angle of the new energy current c For reactive compensation accommodation, E eq Is the effective value of the equivalent voltage source of the large power grid, alpha eq Is the equivalent voltage source phase angle of a large power grid, Z eq Is the equivalent impedance module value of the large power grid.
9. The system of claim 8, the desired new energy current equation being:
I P ＝I DRE cos(α POC -α DRE )
I Q ＝I DRE sin(α POC -α DRE )
wherein I is DRE The effective value of the new energy current.
10. The system of claim 8, the solving the power system flow equation to obtain a set of solutions that maximize apparent load power from all solutions, comprising:
at alpha DRE E [ -pi, pi) interval.
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