CN117856279A - Interactive reactive power control method and system for main distribution network in complex area - Google Patents

Interactive reactive power control method and system for main distribution network in complex area Download PDF

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Publication number
CN117856279A
CN117856279A CN202311744910.6A CN202311744910A CN117856279A CN 117856279 A CN117856279 A CN 117856279A CN 202311744910 A CN202311744910 A CN 202311744910A CN 117856279 A CN117856279 A CN 117856279A
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reactive power
distribution network
reactive
voltage
compensator
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CN202311744910.6A
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Chinese (zh)
Inventor
王铎
李正文
赵琰
于鹏
李忠伟
王顺江
刘阳
叶鹏鹏
刘强
马民
眭冰
张天一
谷雨
钟丽波
时靖宁
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Jinzhou Electric Power Supply Co Of State Grid Liaoning Electric Power Supply Co ltd
State Grid Corp of China SGCC
State Grid Liaoning Electric Power Co Ltd
Shenyang Institute of Engineering
Original Assignee
Jinzhou Electric Power Supply Co Of State Grid Liaoning Electric Power Supply Co ltd
State Grid Corp of China SGCC
State Grid Liaoning Electric Power Co Ltd
Shenyang Institute of Engineering
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Application filed by Jinzhou Electric Power Supply Co Of State Grid Liaoning Electric Power Supply Co ltd, State Grid Corp of China SGCC, State Grid Liaoning Electric Power Co Ltd, Shenyang Institute of Engineering filed Critical Jinzhou Electric Power Supply Co Of State Grid Liaoning Electric Power Supply Co ltd
Priority to CN202311744910.6A priority Critical patent/CN117856279A/en
Publication of CN117856279A publication Critical patent/CN117856279A/en
Pending legal-status Critical Current

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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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • H02J3/008—Circuit arrangements for ac mains or ac distribution networks involving trading of energy or energy transmission rights
    • 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
    • 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • 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
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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
    • 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]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention discloses a complex area main distribution network interaction reactive power control method and system based on jacobian matrix calculation, wherein the method comprises the following steps: establishing an active and reactive power flow model of the system after the reactive power compensation device is added; performing parameter correction based on the jacobian matrix; calculating to obtain a modified jacobian matrix; and calculating the voltage stability influence factor of the power distribution network by obtaining the modified jacobian matrix. Under the condition of unbalanced voltage in the main distribution network, calculating the voltage stability influence factor of the distribution network according to the voltage condition of each node through the established tide model, determining the relation between the current main distribution network and the current main distribution network, and determining the control mode to be adopted by the system, thereby ensuring the voltage stability of the system.

Description

Interactive reactive power control method and system for main distribution network in complex area
Technical Field
The invention belongs to the field of power systems, and particularly relates to a jacobian matrix calculation-based complex area main distribution network interactive reactive power control method and system.
Background
In an electric power system, along with the continuous increase of the grid-connected capacity of renewable energy sources, the pressure of the voltage stability control of a system delivery channel is increased, and the grid-connected inverter of the renewable energy sources plays a vital role in maintaining the voltage stability of a power grid in ensuring the electric energy quality of the system. However, the energy injected into the power grid by the inverter is unstable due to the fluctuation of the output of the renewable energy source, and when the renewable energy source is in an intermittent period or does not generate electricity, the inverter does not work, and corresponding reactive power support cannot be provided for the system. Therefore, it is urgent to study the optimal position of reactive compensation in the case of unbalance of the main distribution network of the power system in a complex system. When the reactive power demand of the power load is uncertain, reactive power unbalance of the distribution network is caused, so that the voltage distribution and the change of phase angles of three phases in the distribution network are improved by adopting the reactive power compensation device. For a complex system, how to realize reactive voltage optimization between main distribution networks and realize real-time error-free adjustment of reactive power of the system become the difficulty of the current technology.
Disclosure of Invention
In order to solve the problem of high reactive power control difficulty in a complex regional main distribution network, the invention provides a complex regional main distribution network interaction reactive power control method and system based on Jacobian matrix calculation.
The technical scheme of the invention is as follows:
a complex area main distribution network interaction reactive power control method based on Jacobian matrix calculation comprises the following steps:
step 1: firstly, establishing an active and reactive power flow model of a system after a reactive power compensation device is added;
step 2: performing parameter correction based on the jacobian matrix;
step 3: calculating to obtain a modified jacobian matrix;
step 4: and calculating the voltage stability influence factor of the power distribution network by obtaining the modified jacobian matrix, and controlling reactive power compensation.
Further, in step 1, the active and reactive power flow models of the system after the reactive power compensation device is built are:
P sh ＝V i 2 G sh -V i V sh (G sh cos(θ i -θ sh )-B sh sin(θ i -θ sh ))
Q sh ＝-V i 2 G sh -V i V sh (G sh sin(θ i -θ sh )-B sh cos(θ i -θ sh ))
by determining the jacobian of the system, active and reactive power functions are obtained, wherein the change of the state variables of the voltage and the power angle at the node is related to the determined jacobian. Therefore, the control of reactive voltage needs to be optimized with multiple parameters:
wherein: p (P) sh ,Q sh Active and reactive power of reactive compensator, V sh Voltage, θ of reactive compensator sh Angle of reactive compensator, G sh Conductance of reactive compensator, B sh Impedance of reactive compensator, V i Voltage amplitude, θ i And (3) voltage angle, PE active power exchange, E is generator voltage in the system, i represents the ith node, N represents the number of nodes, sh is a subscript, the index of the reactive compensator is represented, and delta represents the variation of a corresponding variable.
Further, in the step 2, parameter correction based on the jacobian matrix is performed as a node voltage angle parameter optimization factor, a node voltage amplitude parameter optimization factor, a reactive compensator angle parameter optimization factor and a reactive compensator voltage parameter optimization factor.
Further, when the parameters are optimized in the step 2, the process of calculating the node voltage angle-based parameter optimization factor is as follows:
wherein: k is the number of nodes of the non-opposite support.
Further, the node voltage amplitude parameter-based optimization factor calculation process comprises the following steps:
further, the calculation process of the angle parameter optimization factor of the reactive compensator is as follows:
further, the calculation process of the voltage parameter optimization factor of the reactive compensator is as follows:
further, the process of calculating the modified jacobian matrix in the step 3 is as follows:
further, in step 4, the process of calculating the voltage stability influence factor of the power distribution network by obtaining the modified jacobian matrix is as follows:
when V is CAS When the reactive power is less than or equal to 10, indicating that the reactive power transmitted from the current main power grid to the power distribution network has a certain shortage, and carrying out reactive on-site compensation;
when 10 < V CAS When the reactive power is less than or equal to 20, the reactive power exchange between the current main distribution networks is in a stable running state, and the reactive power is not required to be changed;
when 20 < V CAS And when the reactive power transmitted to the distribution network by the current main power grid is higher than the reactive power demand of the distribution network, the control of the generator is performed, and the reactive power output is reduced.
The control system adopting the complex area main distribution network interaction reactive power control method based on Jacobian matrix calculation comprises
The active and reactive power flow model building module is used for building an active and reactive power flow model of the system after the reactive power compensation device is added;
the parameter correction module is used for correcting the node voltage angle parameter optimization factor, the node voltage amplitude parameter optimization factor, the reactive compensator angle parameter optimization factor and the reactive compensator voltage parameter optimization factor based on the jacobian matrix;
the jacobian matrix correction module is used for obtaining a corrected jacobian matrix through calculation;
and the power distribution network voltage stability control module calculates the power distribution network voltage stability influence factor by obtaining the modified jacobian matrix and controls reactive power compensation.
The beneficial effects of the invention are as follows: under the condition of unbalanced voltage in the main distribution network, calculating the voltage stability influence factor of the distribution network according to the voltage condition of each node through the established tide model, determining the relation between the current main distribution network and the current main distribution network, and determining the control mode to be adopted by the system, thereby ensuring the voltage stability of the system.
Drawings
FIG. 1 is a flow chart of a complex regional main distribution network interactive reactive power control method based on Jacobian matrix calculation;
FIG. 2 is a block diagram of a complex regional main distribution network interactive reactive power control system based on Jacobian matrix calculation;
FIG. 3 is a schematic diagram of system voltage fluctuations in an embodiment of the present invention.
Detailed Description
A complex area main distribution network interaction reactive power control method based on Jacobian matrix calculation is shown in figure 1, and comprises the following steps:
step 1: firstly, establishing an active and reactive power flow model of a system after a reactive power compensation device is added;
step 2: performing parameter correction based on the jacobian matrix;
step 3: calculating to obtain a modified jacobian matrix;
step 4: and calculating the voltage stability influence factor of the power distribution network through the modified jacobian matrix, and controlling reactive power compensation.
In the step 1, an active and reactive power flow model of the system after the reactive power compensation device is added is established as follows:
P sh ＝V i 2 G sh -V i V sh (G sh cos(θ i -θ sh )-B sh sin(θ i -θ sh ))
Q sh ＝-V i 2 G sh -V i V sh (G sh sin(θ i -θ sh )-B sh cos(θ i -θ sh ))
by determining the jacobian of the system, active and reactive power functions are obtained, wherein the change of the state variables of the voltage and the power angle at the node is related to the determined jacobian. Therefore, the control of reactive voltage needs to be optimized with multiple parameters:
wherein: p (P) sh ,Q sh Active and reactive power of reactive compensator, V sh Voltage, θ of reactive compensator sh Angle of reactive compensator, G sh Conductance of reactive compensator, B sh Impedance of reactive compensator, V i Voltage amplitude, θ i And (3) voltage angle, PE active power exchange, E is generator voltage in the system, i represents the ith node, N represents the number of nodes, sh is a subscript, the index of the reactive compensator is represented, and delta represents the variation of a corresponding variable.
And 2, performing parameter correction based on the jacobian matrix to obtain node voltage angle parameter optimization factors, node voltage amplitude parameter optimization factors, reactive compensator angle parameter optimization factors and reactive compensator voltage parameter optimization factors.
When the parameters are optimized in the step 2, the node voltage angle-based parameter optimization factor calculation process is as follows:
wherein: k is the number of nodes of the non-opposite support.
In the step 2, the optimization factor calculation process based on the node voltage amplitude parameter is as follows:
the calculation process of the angle parameter optimization factor of the reactive compensator in the step 2 is as follows:
the calculation process of the voltage parameter optimization factor of the reactive compensator in the step 2 is as follows:
the process of calculating the modified jacobian matrix in the step 3 is as follows:
in step 4, the process of calculating the voltage stability influence factor of the power distribution network by obtaining the modified jacobian matrix is as follows:
when V is CAS When the reactive power is less than or equal to 10, indicating that the reactive power transmitted from the current main power grid to the power distribution network has a certain shortage, and carrying out reactive on-site compensation;
when 10 < V CAS When the reactive power is less than or equal to 20, the reactive power exchange between the current main distribution networks is in a stable running state, and the reactive power is not required to be changed;
when 20 < V CAS And when the reactive power transmitted to the distribution network by the current main power grid is higher than the reactive power demand of the distribution network, the control of the generator is performed, and the reactive power output is reduced.
As shown in fig. 2, a control system of an interactive reactive power control method for a main distribution network in a complex area includes:
the active and reactive power flow model building module is used for building an active and reactive power flow model of the system after the reactive power compensation device is added;
the parameter correction module is used for correcting the node voltage angle parameter optimization factor, the node voltage amplitude parameter optimization factor, the reactive compensator angle parameter optimization factor and the reactive compensator voltage parameter optimization factor based on the jacobian matrix;
the jacobian matrix correction module is used for obtaining a corrected jacobian matrix through calculation;
and the power distribution network voltage stability control module calculates the power distribution network voltage stability influence factor by obtaining the modified jacobian matrix and controls reactive power compensation.
Application example:
the active power and the reactive power of the system Psh and Qsh reactive power compensator are 220MW and 10MVar respectively;
the voltage of the Vsh reactive compensator is 10kW,
the angle of the θsh reactive compensator is 20 degrees,
the conductance of the Gsh reactive compensator was 1.5S,
the impedance of the Bsh reactive compensator is 0.6Ω,
the amplitude of the Vi voltage is 30kV,
the angle of the thetai voltage is 15 degrees,
the PE active power exchange is 50kW,
the generator voltage in the E system is 380V, the number of nodes is 89,
(1) The node voltage angle parameter-based optimization factor is calculated to obtain
(2) The node voltage amplitude parameter-based optimization factor is calculated to obtain
(3) Calculating the angle parameter optimization factor of the reactive compensator
(4) Calculating the voltage parameter optimization factor of the reactive compensator
And obtaining the voltage stability influence factor of the power distribution network through calculation:
when V is CAS When the power is less than or equal to 8.97 and less than or equal to 10, the reactive power transmitted to the distribution network by the current main power grid is indicated to have a certain shortage, and reactive power on-site compensation is needed. The simulation results obtained in this example are shown in fig. 3.
The above is only a specific embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The interactive reactive power control method for the main distribution network of the complex area is characterized by comprising the following steps of:
step 1, establishing an active and reactive power flow model of a system after a reactive power compensation device is added, and obtaining active and reactive power functions by determining a jacobian matrix of the system;
step 2, carrying out parameter correction based on the jacobian matrix;
step 3, calculating to obtain a modified jacobian matrix;
and 4, calculating the voltage stability influence factor of the power distribution network by obtaining the modified jacobian matrix, and controlling reactive power compensation.
2. The interactive reactive power control method for a complex regional main distribution network according to claim 1, wherein the building of the active and reactive power flow models of the system after adding the reactive power compensation device is:
P sh ＝V i 2 G sh -V i V sh (G sh cos(θ i -θ sh )-B sh sen(θ i -θ sh ))
Q sh ＝-V i 2 G sh -V i V sh (G sh sin(θ i -θ sh )-B sh cos(θ i -θ sh ))
obtaining active and reactive power functions by determining a jacobian of the system, wherein changes in state variables of voltage and power angle at the nodes are related to the determined jacobian;
wherein: p (P) sh ,Q sh Active and reactive power of reactive compensator, V sh Voltage, θ of reactive compensator sh Angle of reactive compensator, G sh Conductance of reactive compensator, B sh Impedance of reactive compensator, V i Voltage amplitude, θ i And (3) voltage angle, PE active power exchange, E is generator voltage in the system, i represents the ith node, N represents the number of nodes, sh is a subscript, the index of the reactive compensator is represented, and delta represents the variation of a corresponding variable.
3. The interactive reactive power control method for the main distribution network of the complex area according to claim 2, wherein the parameter correction based on the jacobian matrix means that the control of reactive power voltage is optimized in multiple parameters, and the multiple parameters are node voltage angle parameter optimizing factors, node voltage amplitude parameter optimizing factors, reactive power compensator angle parameter optimizing factors and reactive power compensator voltage parameter optimizing factors respectively.
4. The interactive reactive power control method for the main distribution network of the complex area according to claim 1, wherein the process of calculating the modified jacobian matrix is as follows:
V xzi to optimize the factor based on the angle parameter of the node voltage, V xzi To optimize the factor theta based on the node voltage amplitude parameter xzsh Optimizing factor for angle parameter of reactive compensator, V xzsh And optimizing factors for the voltage parameters of the reactive compensator.
5. The interactive reactive power control method for the main distribution network of the complex area according to claim 1, wherein the process of calculating the voltage stability influence factor of the distribution network by obtaining the modified jacobian matrix is as follows:
when V is CAS When the reactive power is less than or equal to 10, indicating that the reactive power transmitted from the current main power grid to the power distribution network has a certain shortage, and carrying out reactive on-site compensation;
when 10 < V CAS When the reactive power is less than or equal to 20, the reactive power exchange between the current main distribution networks is in a stable running state, and the reactive power is not required to be changed;
when 20 < V CAS And when the reactive power transmitted to the distribution network by the current main power grid is higher than the reactive power demand of the distribution network, the control of the generator is performed, and the reactive power output is reduced.
6. A complex regional main distribution network interactive reactive power control method according to claim 3, wherein node voltage angle parameter-based optimization factor θ is performed xzi The calculation process is as follows:
wherein: k is the number of nodes of the non-opposite support.
7. A complex regional main distribution network interactive reactive power control method according to claim 3, wherein node voltage amplitude parameter-based optimization factor V is performed xzi The calculation process is as follows:
8. a complex regional main distribution network interactive reactive power control method according to claim 3, characterized in that the reactive power compensator angle parameter optimization factor θ is performed xzsh The calculation process is as follows:
9. a complex regional main distribution network interactive reactive power control method according to claim 3, characterized in that reactive power compensator voltage parameter optimization factor V is performed xzsh The calculation process is as follows:
10. the utility model provides a complex regional owner joins in marriage interactive reactive power control system which characterized in that includes:
the active and reactive power flow model building module is used for building an active and reactive power flow model of the system after the reactive power compensation device is added;
the parameter correction module is used for correcting the node voltage angle parameter optimization factor, the node voltage amplitude parameter optimization factor, the reactive compensator angle parameter optimization factor and the reactive compensator voltage parameter optimization factor based on the jacobian matrix;
the jacobian matrix correction module is used for obtaining a corrected jacobian matrix through calculation;
and the power distribution network voltage stability control module calculates the power distribution network voltage stability influence factor by obtaining the modified jacobian matrix and controls reactive power compensation.
CN202311744910.6A 2023-12-18 2023-12-18 Interactive reactive power control method and system for main distribution network in complex area Pending CN117856279A (en)

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Application Number Priority Date Filing Date Title
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