CN114123355B - Photovoltaic high-permeability voltage control method and system based on intelligent terminal of transformer area - Google Patents

Photovoltaic high-permeability voltage control method and system based on intelligent terminal of transformer area Download PDF

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CN114123355B
CN114123355B CN202111098975.9A CN202111098975A CN114123355B CN 114123355 B CN114123355 B CN 114123355B CN 202111098975 A CN202111098975 A CN 202111098975A CN 114123355 B CN114123355 B CN 114123355B
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node
voltage
power
limit
adjustment
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CN114123355A (en
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白帅涛
王鹏
郭屾
张冀川
林佳颖
张明宇
张志明
孙浩洋
谭传玉
秦四军
张永芳
姚治国
吕琦
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
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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
    • H02J3/48—Controlling the sharing of the in-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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • 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
    • 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
    • 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
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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

Abstract

The invention provides a photovoltaic high-permeability lower voltage control method and system based on a platform area intelligent terminal, comprising the following steps: when node voltage exceeding occurs in the power distribution network, the intelligent terminal of the platform area calculates the voltage exceeding value of each node with voltage exceeding based on the electric data of each node reported by the intelligent ammeter, calculates the comprehensive voltage sensitivity of each node with distributed photovoltaic power supply during power adjustment, and respectively selects the node with the largest comprehensive voltage sensitivity in a distributed photovoltaic reactive power adjustment mode and an energy storage adjustment mode; on the basis of equivalent regulation, calculating the regulation cost of the corresponding node regulation mode, and selecting the regulation mode with the minimum regulation cost for power regulation; and after the node adjustable power with the minimum adjustment cost is used up, the comprehensive voltage sensitivity and the adjustment cost are recalculated until the voltage of each node is no longer out of limit. The invention can calculate the voltage sensitivity of the multipoint voltage when exceeding the limit, and accurately design the voltage control strategy by considering the adjustment cost.

Description

Photovoltaic high-permeability voltage control method and system based on intelligent terminal of transformer area
Technical Field
The invention belongs to the technical field of power distribution operation and maintenance, and particularly relates to a photovoltaic high-permeability voltage control method and system based on a district intelligent terminal.
Background
The permeability of distributed resources such as distributed power sources, distributed energy storage and the like in a power distribution network is further improved, distributed photovoltaic power generation for a roof access user in a low-voltage power distribution network is widely developed and used, and the problem of voltage out-of-limit is one of important reasons for influencing the absorption of the photovoltaic power generation. In recent years, with the construction of power distribution digitization, a platform intelligent terminal based on software definition is installed on the platform side, and information of devices such as a distributed power supply, an intelligent ammeter and an intelligent breaker is accessed, so that centralized control of the distributed power supply can be realized, and a solution way is provided for the distributed power supply to eliminate the voltage out-of-limit problem. Based on the intelligent power distribution network, the method for calculating and controlling the voltage sensitivity of the power change of the node to the overvoltage node and determining the out-of-limit regulation and control measures of the node voltage is widely studied by students.
However, the traditional calculation of the voltage sensitivity has no practicability, on one hand, many methods adopt a Newton-Laporton method to solve the derivative of power to voltage in a Jacobian matrix of a power flow equation to obtain the voltage sensitivity, but when the Newton-Laporton method is used for calculating the power flow equation, a node admittance matrix is adopted, the transadmittance of non-adjacent nodes is zero, the derivative of the calculated power to voltage is zero, and the method cannot be used for calculating the voltage sensitivity; on the other hand, single-point voltage sensitivity cannot solve the case where the voltages at multiple points are simultaneously out of limit. Because the voltage control strategy needs to be designed with reference to the voltage sensitivity, inaccuracy in the voltage sensitivity calculation directly leads to inaccuracy in the voltage control strategy. There is therefore a need to improve existing voltage control strategies.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a photovoltaic high-permeability lower voltage control method based on a district intelligent terminal, which comprises the following steps:
when node voltage exceeding occurs in the power distribution network, the intelligent terminal of the platform area calculates the voltage exceeding limit value of each node with voltage exceeding limit in the power distribution network and the comprehensive voltage sensitivity of each node with distributed photovoltaic power supply during power adjustment based on the electrical data of each node of the power distribution network reported by the intelligent ammeter;
respectively selecting nodes with the maximum comprehensive voltage sensitivity in different adjustment modes of the distributed photovoltaic power supply, calculating the adjustment cost of the adjustment mode of the corresponding nodes on the basis of equivalent adjustment, and selecting the adjustment mode with the minimum adjustment cost for power adjustment;
when the node adjustable power with the minimum adjustment cost is used up, the comprehensive voltage sensitivity and the adjustment cost of each available node containing the distributed photovoltaic power supply are recalculated, and power adjustment is carried out until the voltage of each node is not out of limit;
the node containing the distributed photovoltaic power supply comprises an energy storage device node and a photovoltaic inverter node, the adjusting mode comprises energy storage device active adjustment, photovoltaic inverter active adjustment and photovoltaic inverter reactive adjustment, and the adjusting cost comprises adjusting cost of the photovoltaic inverter and adjusting cost of the energy storage device.
Preferably, the intelligent terminal calculates a voltage limit value of each node with voltage limit exceeding in the power distribution network based on the electrical data of each node of the power distribution network reported by the intelligent ammeter, and calculates an integrated voltage sensitivity of each node with distributed photovoltaic power supply during power adjustment, including:
the intelligent terminal of the transformer area obtains a Jacobian matrix by utilizing a Newton-Laportson method based on the electric data of each node of the power distribution network reported by the intelligent ammeter, and calculates the voltage sensitivity of each node containing the distributed photovoltaic power supply in the power distribution network to each voltage out-of-limit node;
the intelligent terminal of the platform area calculates the voltage threshold value of each node with voltage threshold exceeding in the power distribution network based on the electrical data of each node of the power distribution network reported by the intelligent ammeter;
based on the power adjustment of the nodes with the distributed photovoltaic power supply in the power distribution network, the voltage sensitivity of each node with the voltage out-of-limit and the voltage out-of-limit value of each node with the voltage out-of-limit are calculated, and the comprehensive voltage sensitivity of each node with the distributed photovoltaic power supply in the power distribution network is calculated;
the electrical data of each node of the power distribution network reported by the intelligent electric meter comprises voltage of each node, power of each node, output of a distributed power supply and state of charge data of an energy storage device.
Preferably, each of the distribution networks includes a comprehensive voltage sensitivity when the power of the distributed photovoltaic power supply node is adjusted, and the comprehensive voltage sensitivity is calculated according to the following formula:
in the method, in the process of the invention,for the integrated voltage sensitivity during reactive power regulation of node H containing distributed photovoltaic power in the distribution network, < >>For the comprehensive voltage sensitivity of the power distribution network including the active power adjustment of the node H of the distributed photovoltaic power supply, m is the number of all voltage out-of-limit nodes in the power distribution network, and DeltaV k The voltage of the kth voltage out-of-limit node in the power distribution network is the more limited value,for the reactive power regulation of node H containing a distributed photovoltaic power supply in a power distribution network, the voltage sensitivity to the kth voltage out-of-limit node is adjusted, < >>The voltage sensitivity of a kth voltage out-of-limit node is adjusted for the active power of a node H containing a distributed photovoltaic power supply in the power distribution network;
the voltage threshold value of the kth voltage threshold-exceeding node in the power distribution network is calculated according to the following formula:
ΔV k ＝V k -V max
wherein V is k V is the voltage value of the kth voltage out-of-limit node in the power distribution network max Is the maximum voltage.
Preferably, the calculating the voltage sensitivity of each power regulation node containing the distributed photovoltaic power supply to each voltage out-of-limit node in the power distribution network includes:
for each distributed photovoltaic power supply node in the power distribution network, respectively calculating the voltage sensitivity of power regulation on each voltage threshold crossing node when the distributed photovoltaic power supply node is an upstream node and a downstream node of the voltage threshold crossing node and a node on a branch of a line where the node is positioned;
The upstream node of the voltage limit crossing node is a rest node on a line which is led out from the distribution transformer, passes through the voltage limit crossing node and reaches a terminal node of the distribution network, and is removed from the voltage limit crossing node;
and the downstream nodes of the voltage limit crossing nodes are the rest nodes including the end nodes of the power distribution network on the line between the voltage limit crossing nodes and the end nodes of the power distribution network except the voltage limit crossing nodes.
Preferably, when the node containing the distributed photovoltaic power source is an upstream node of the voltage limit crossing node, the voltage sensitivity of the power adjustment to each voltage limit crossing node is calculated according to the following formula:
in the method, in the process of the invention,for adjusting the voltage sensitivity to the voltage out-of-limit node N when the upstream of the voltage out-of-limit node N in the power distribution network contains the reactive power of the distributed photovoltaic power supply node A, < >>In order to adjust the voltage sensitivity of the power distribution network to the voltage out-of-limit node N when the upstream of the voltage out-of-limit node N contains the active power of the distributed photovoltaic power supply node A, j is the adjacent node of the node A, N is the number of the nodes adjacent to the node A, and V j For the voltage of node j, G Aj For conductance between node A and node j, B Aj Delta is the susceptance between node A and node j Aj For the power angle between node A and node j, V A For the voltage of node A, B AA For susceptance between node A and node A, i is the ith node, V, between node N and node A upstream of node N i For the voltage of node i, V i-1 Is the voltage of the node immediately upstream of node i.
Preferably, when the node containing the distributed photovoltaic power source is a downstream node of the voltage limit crossing node, the voltage sensitivity of the power adjustment to each voltage limit crossing node is calculated according to the following formula:
in the method, in the process of the invention,for adjusting the voltage sensitivity to the voltage out-of-limit node N when the reactive power of the distributed photovoltaic power supply node Y is contained at the downstream of the voltage out-of-limit node N in the power distribution network, < + >>To adjust the voltage sensitivity to the voltage threshold crossing node N when the active power of the distributed photovoltaic power supply node Y is contained at the downstream of the voltage threshold crossing node N in the power distribution network, V N For the voltage of node N, V Y For the voltage of node Y, +.>Partial derivative of reactive power sent by node Y distributed photovoltaic power supply to voltage, +.>For the partial derivative of active power to voltage, l is the first node from node N to node Y downstream of node N, X l For reactance between node l and node l immediately upstream, R l The resistance between node l and the node upstream of node l.
Preferably, when the node containing the distributed photovoltaic power source is a node on a branch of a line where the voltage limit crossing node is located, the voltage sensitivity of the power adjustment to each voltage limit crossing node is calculated according to the following formula:
in the method, in the process of the invention,for regulating the voltage sensitivity of a power distribution network to a voltage threshold node N when the reactive power of the distributed photovoltaic power supply node E is contained on the branch of the line where said voltage threshold node N is located, < >>To regulate the voltage sensitivity of a voltage threshold node N in a power distribution network when active power containing a distributed photovoltaic power supply node E is applied to a branch of a line where the voltage threshold node N is located, V C For the voltage of node C, V E For the voltage of node E, +.>Partial derivative of reactive power to voltage for node E distributed photovoltaic power supply, +.>For the partial derivative of active power to voltage, r is the r node from the branch starting node F to the node E on the branch where the node E is located, X r For reactance between node R and the node upstream of node R, R r The resistance between the node r and the upstream node before the node r is that s is the s-th node from the node C to the node N, V, wherein the s-th node comprises the node N, the branch circuit where the node E is positioned and the line where the node N is positioned s For the voltage at node s, V s-1 Is the voltage of the node preceding node s in the direction from node C to node N.
Preferably, the adjustment cost of the energy storage device is calculated according to the following formula:
in the formula, cost 0 For the energy storage device, the cost of the active power of the node T is regulated, delta P is the variation of the active power of the line where the node T is located, U N The rated voltage of the line where the node T is located is T, the T is the T-th node from the line origin to the node T, and P t Active power flowing into node t for the upstream node before node t, R t For the resistance between node t and the node immediately upstream of node t, ΔP ess Active power absorbed by the energy storage device.
Preferably, the adjusting cost of the photovoltaic inverter includes:
the photovoltaic inverter maintains the active power unchanged, and the cost of a reactive power stage is increased;
after the photovoltaic inverter reaches the capacity limit, the power factor angle is regulated, the active power is reduced, and the cost of a reactive power stage is increased;
the photovoltaic inverter reduces the costs of the active and reactive power phases proportionally after the power factor angle reaches a limit.
Preferably, the photovoltaic inverter maintains active power unchanged, increases the cost of the reactive power stage, and is calculated according to the following formula:
In the formula, cost 1 The cost of the reactive compensation stage is increased for maintaining the active power of the photovoltaic inverter unchanged, delta Q is the reactive power variation of the line where the node T is located, U N The rated voltage of the line where the node T is located, T is the T-th node from the line origin to the node T of the line where the node T is located, Q t Reactive power flowing into node t for the node upstream of node t, R t Is the resistance between node t and the node immediately upstream of node t.
Preferably, after the photovoltaic inverter reaches the capacity limit, the power factor angle is adjusted, the active power is reduced, and the cost of the reactive power stage is increased, and the photovoltaic inverter is calculated according to the following formula:
in the formula, cost 2 The cost of reactive power stage is increased while the active power is reduced for the photovoltaic inverter by adjusting the power factor angle after the capacity limit is reached, delta P is the active power variation of the line where node T is located, U N The rated voltage of the line where the node T is located is T, the T is the T-th node from the line origin to the node T, and P t Active power flowing into node t for the upstream node before node t, R t For the resistance between the node T and the upstream node before the node T, deltaQ is the reactive power variation of the line where the node T is located, Q t Reactive power flows into node t for the node upstream of node t.
Preferably, after the power factor angle reaches the limit, the photovoltaic inverter reduces the cost of active power and reactive power phases proportionally, and the cost is calculated according to the following formula:
in the formula, cost 3 For the photovoltaic inverter to proportionally reduce the cost of active power and reactive power stages after the power factor angle reaches the limit, delta P is the active power variation of the line where the node T is located, U N The rated voltage of the line where the node T is located is T, the T is the T-th node from the line origin to the node T, and P t Active power flowing into node t for the upstream node before node t, R t For the resistance between the node T and the upstream node before the node T, deltaQ is the reactive power variation of the line where the node T is located, Q t Reactive power flows into node t for the node upstream of node t.
Preferably, on the basis of equivalent adjustment, calculating an adjustment cost of the corresponding node adjustment mode includes:
based on the comprehensive voltage sensitivity, different adjustment modes achieve the same voltage effect by adjusting power, and the adjustment cost is generated.
Preferably, a topology model of the distribution network is stored in the intelligent terminal of the platform area, and the topology model is used for calculating the voltage limit value of each node with voltage limit exceeding in the distribution network, the comprehensive voltage sensitivity of each node containing the distributed photovoltaic power supply during power adjustment, and the power adjustment quantity and the adjustment cost required by adjusting the voltage limit value of each node under the maximum value of the comprehensive voltage sensitivity; and the device is used for storing the capacity of the photovoltaic inverter, the maximum power factor angle of the photovoltaic inverter, the active adjustment allowance of the photovoltaic inverter, the reactive adjustment allowance of the photovoltaic inverter, the limit value of the charge capacity of the energy storage device, the rated active power of the energy storage device, the active adjustment allowance of the energy storage device and the limit value of each node voltage.
Based on the same inventive concept, the invention also provides a photovoltaic high-permeability lower voltage control system based on the intelligent terminal of the platform region, which comprises the following steps: the system comprises a comprehensive voltage sensitivity module, a sequencing module and a power adjusting module;
the comprehensive voltage sensitivity module is used for calculating the voltage limit value of each node with voltage limit crossing in the power distribution network and the comprehensive voltage sensitivity of each node with distributed photovoltaic power supply during power adjustment based on the electrical data of each node of the power distribution network reported by the intelligent ammeter when the voltage of each node in the power distribution network is over-limit;
the sequencing module is used for respectively selecting the node with the maximum comprehensive voltage sensitivity in different regulation modes of the distributed photovoltaic power supply, calculating the regulation cost of the regulation mode corresponding to the node on the basis of equivalent regulation, and selecting the regulation mode with the minimum regulation cost for power regulation;
the power adjusting module is used for recalculating the comprehensive voltage sensitivity and the adjusting cost of each available node containing the distributed photovoltaic power supply after the node adjustable power with the minimum adjusting cost is used up, and adjusting the power until the voltage of each node is no longer out of limit;
The node containing the distributed photovoltaic power supply comprises an energy storage device node and a photovoltaic inverter node, the adjusting mode comprises energy storage device active adjustment, photovoltaic inverter active adjustment and photovoltaic inverter reactive adjustment, and the adjusting cost comprises adjusting cost of the photovoltaic inverter and adjusting cost of the energy storage device.
Compared with the closest prior art, the invention has the following beneficial effects:
the invention provides a photovoltaic high-permeability lower voltage control method and system based on a platform area intelligent terminal, comprising the following steps: when node voltage exceeding occurs in the power distribution network, the intelligent terminal of the platform area calculates the voltage exceeding limit value of each node with voltage exceeding limit in the power distribution network and the comprehensive voltage sensitivity of each node with distributed photovoltaic power supply during power adjustment based on the electrical data of each node of the power distribution network reported by the intelligent ammeter; respectively selecting nodes with the maximum comprehensive voltage sensitivity in different adjustment modes of the distributed photovoltaic power supply, calculating the adjustment cost of the adjustment mode of the corresponding nodes on the basis of equivalent adjustment, and selecting the adjustment mode with the minimum adjustment cost for power adjustment; when the node adjustable power with the minimum adjustment cost is used up, the comprehensive voltage sensitivity and the adjustment cost of each available node containing the distributed photovoltaic power supply are recalculated, and power adjustment is carried out until the voltage of each node is not out of limit; the node containing the distributed photovoltaic power supply comprises an energy storage device node and a photovoltaic inverter node, the adjusting mode comprises energy storage device active adjustment, photovoltaic inverter active adjustment and photovoltaic inverter reactive adjustment, and the adjusting cost comprises adjusting cost of the photovoltaic inverter and adjusting cost of the energy storage device. The invention designs a more accurate calculation method of voltage sensitivity, provides comprehensive voltage sensitivity to describe the regulation and control capability of the distributed photovoltaic resource, solves the problem that the voltage sensitivity of the multi-point voltage exceeding the limit is not easy to calculate, and provides accurate data guidance for voltage adjustment under the power distribution Internet of things; the invention designs a voltage regulation and control method considering the cost, which can accurately control the voltage and simultaneously reduce the cost to the minimum.
Drawings
Fig. 1 is a schematic flow chart of a photovoltaic high-permeability voltage control method based on a intelligent terminal of a transformer area;
fig. 2 is a schematic diagram of a low-voltage distribution network according to an embodiment of a photovoltaic high-permeability voltage control method based on a intelligent terminal of a transformer area;
fig. 3 is a graph of the relationship between reactive power and active power output by the photovoltaic inverter provided by the invention;
fig. 4 is a flow chart of a voltage regulation measure under a photovoltaic high permeability based on a intelligent terminal of a platform area;
fig. 5 is a schematic diagram of a basic structure of a photovoltaic high-permeability voltage control system based on a intelligent terminal of a platform area.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Example 1:
the flow diagram of the photovoltaic high-permeability voltage control method based on the intelligent terminal of the platform area is shown in figure 1, and the method comprises the following steps:
step 1: when node voltage exceeding occurs in the power distribution network, the intelligent terminal of the platform area calculates the voltage exceeding limit value of each node with voltage exceeding limit in the power distribution network and the comprehensive voltage sensitivity of each node with distributed photovoltaic power supply during power adjustment based on the electrical data of each node of the power distribution network reported by the intelligent ammeter;
Step 2: respectively selecting nodes with the maximum comprehensive voltage sensitivity in different adjustment modes of the distributed photovoltaic power supply, calculating the adjustment cost of the adjustment mode of the corresponding nodes on the basis of equivalent adjustment, and selecting the adjustment mode with the minimum adjustment cost for power adjustment;
step 3: when the node adjustable power with the minimum adjustment cost is used up, the comprehensive voltage sensitivity and the adjustment cost of each available node containing the distributed photovoltaic power supply are recalculated, and power adjustment is carried out until the voltage of each node is not out of limit;
the node containing the distributed photovoltaic power supply comprises an energy storage device node and a photovoltaic inverter node, the adjusting mode comprises energy storage device active adjustment, photovoltaic inverter active adjustment and photovoltaic inverter reactive adjustment, and the adjusting cost comprises adjusting cost of the photovoltaic inverter and adjusting cost of the energy storage device.
The invention aims to design a practical voltage sensitivity calculation method based on a district intelligent terminal, and secondly provides a voltage control strategy which enables more photovoltaics to generate power, smaller system loss and larger user benefits.
According to the invention, a chain rule is adopted to calculate single-node voltage sensitivity, then a comprehensive voltage sensitivity aiming at multi-node voltage out-of-limit is provided, a calculation method is researched, and then a voltage regulation method considering cost is designed, so that the photovoltaic larger power generation, the smaller loss of the system and more benefits of users are realized while the system voltage is controlled.
The step 1 specifically comprises the following steps:
based on the electrical data of each node of the power distribution network reported by the intelligent electric meter, the intelligent terminal of the transformer area obtains a Jacobian matrix by utilizing a Newton-Laportson method, and calculates the voltage sensitivity of each node containing the distributed photovoltaic power supply in the power distribution network to each voltage out-of-limit node.
For each distributed photovoltaic power supply node in the power distribution network, respectively calculating the voltage sensitivity of power regulation on each voltage threshold crossing node when the distributed photovoltaic power supply node is an upstream node and a downstream node of the voltage threshold crossing node and a node on a branch of a line where the node is positioned;
the upstream node of the voltage limit crossing node is a rest node on a line which is led out from the distribution transformer, passes through the voltage limit crossing node and reaches a terminal node of the distribution network, and is removed from the voltage limit crossing node;
and the downstream nodes of the voltage limit crossing nodes are the rest nodes including the end nodes of the power distribution network on the line between the voltage limit crossing nodes and the end nodes of the power distribution network except the voltage limit crossing nodes.
The intelligent terminal of the platform area is provided with a topology model of the power distribution network, and the topology model is used for calculating the voltage limit value of each node with voltage limit exceeding in the power distribution network, the comprehensive voltage sensitivity of each node containing a distributed photovoltaic power supply during power adjustment, the power adjustment quantity and the adjustment cost required by adjusting the voltage limit value of each node under the maximum value of the comprehensive voltage sensitivity; and the device is used for storing the capacity of the photovoltaic inverter, the maximum power factor angle of the photovoltaic inverter, the active adjustment allowance of the photovoltaic inverter, the reactive adjustment allowance of the photovoltaic inverter, the limit value of the charge capacity of the energy storage device, the rated active power of the energy storage device, the active adjustment allowance of the energy storage device and the limit value of each node voltage.
Because the low-voltage distribution network mostly adopts closed-loop design, the structure of the low-voltage distribution network is radial in a power supply mode of open-loop operation, and in the embodiment, a schematic diagram of the low-voltage distribution network is shown in fig. 2:
wherein V is N The voltage value of the node N; r is R N 、X N The resistance and reactance values of the branches between the node N-1 and the node N are obtained; p (P) N 、Q N Active and reactive power flowing into node N for the upstream node; p (P) LN 、Q LN Active power and reactive power of the load of the node N; p (P) GN 、Q GN The node N is connected with active power and reactive power sent by DG.
Taking node N connected with DG as a reference point, when the voltage of the node N is out of limit, for convenience of analysis, the nodes except the node N are divided into three types, namely an upstream node (1, 2 … N-1), a downstream node (N+ … X) and other branch nodes (E, F and the like), taking reactive power regulation of the upstream node as an example, and the sensitivity of reactive power regulation of the node 2 to the voltage of the node N can be expressed as follows by adopting a chain rule:
1) The power adjustment of the upstream node is performed on the voltage sensitivity of the node N, and the calculation mode is as follows:
when the influence of the transverse voltage component is ignored, the voltage relationship between the node i-1 and the node i at the upstream of the node 2 is as follows:
V i ＝V i-1 -(P i R i +Q i X i )/V i-1 (2)
wherein V is i For the voltage of node i, V i-1 For the voltage of the node immediately upstream of node i, P i Active power flowing into node i for node i upstream node, Q i Inflow of reactive power to node i for upstream node of node i, R i X is the resistance value between the node i-1 and the node i i Is the reactance value between node i-1 and node i.
Formula (2) can be transformed into:
when only the injection reactive power of the node 2 changes and the power of the other nodes is not adjusted, the power loss of the branch and the line at the downstream of the node 2 does not change greatly and can be ignored, namely P of any node i at the downstream of the node 2 i And Q i Can be considered constant. Equation pair V i And (3) deriving:
when solving a power flow equation by adopting a Newton-Laportson method under a polar coordinate form, partial derivatives of reactive power of a node and adjacent nodes on voltage are given in a Jacobian matrix, and the partial derivatives of reactive power sent by a distributed photovoltaic power supply of the node 2 on voltage of the node 2 are shown as formulas (5) and (6) respectively:
G 2j and G 12 Representing the conductance between nodes 2, j and between nodes 1, 2, B, respectively 2j And B 12 Representing susceptances between nodes 2, j and between nodes 1, 2, delta 2j And delta 12 Respectively representPower angle between nodes 2, j and between nodes 1, 2.
From this, the reactive power adjustment of the upstream node 2 can be calculated, the voltage sensitivity of the node N is obtained by taking equations (4), (5) into equation (1):
similarly, it can be calculated that the active power of the upstream node 2 is adjusted, and the voltage sensitivity of the node N is calculated by the formula:
In the formulae (7) and (8),for adjusting the voltage sensitivity to the voltage out-of-limit node N when the upstream of the voltage out-of-limit node N in the power distribution network contains the reactive power of the distributed photovoltaic power supply node 2, < >>In order to adjust the voltage sensitivity of the power distribution network to the voltage out-of-limit node N when the upstream of the voltage out-of-limit node N contains the active power of the distributed photovoltaic power supply node 2, j is the adjacent node of the node 2, N is the number of the nodes adjacent to the node 2, V j For the voltage of node j, G 2j B is the conductance between node 2 and node j 2j Delta is the susceptance between node 2 and node j 2j For the power angle between node 2 and node j, V 2 For the voltage of node 2, B 22 For susceptances between node 2 and node 2, i is the ith node, V, between node N and node 2 upstream of node N i For the voltage of node i, V i-1 Is the voltage of the node immediately upstream of node i.
2) The power adjustment of the downstream node is applied to the voltage sensitivity of the node N, and the calculation mode is as follows:
taking the reactive power adjustment of the node X as an example, the voltage sensitivity of the power adjustment of the downstream node to the node N is calculated, and the voltage relationship between the node i and the node i+1 upstream of the node X can be expressed as:
V i for the voltage of node i, V i+1 For the voltage of the next downstream node after node i, P i+1 Active power flowing into node i+1 for node upstream of node i+1, Q i Reactive power flowing into node i+1 for the upstream node of node i+1, R i+1 X is the resistance between node i and node i+1 i+1 Is the reactance value between node i and node i + 1.
Formula (9) can be transformed into:
in the formula (10), the third term is far smaller than the first two terms, and can be simplified as:
adding the equation (11) corresponding to the node N and the node X can obtain:
it can be seen that R i+1 、X i+1 For the fixed value, the voltage value of the node N depends on the value of the node X and the power value of the line flowing into each node between the node N and the node X, and the power change of the branch of the node N and the node X, namely delta P, can be ignored because the injection reactive power of the node X is only regulated N ＝ΔP N+1 ＝…＝ΔP X And DeltaQ N ＝ΔQ N+1 ＝…＝ΔQ X And because the adjustment time interval is smaller, namely, P is considered i+1 Constant, i.e. ΔP N ＝ΔP N+1 ＝…＝ΔP X =0 and Δq N ＝ΔQ N+1 ＝…＝ΔQ X ＝ΔQ GX 。
Therefore, derivation is performed on both sides of the equal sign of the formula (12):
will beCarrying out reactive power adjustment on a downstream node X by the method (13), and calculating a voltage sensitivity calculation formula of the node N:
similarly, the voltage sensitivity calculation formula of the node N can be calculated by actively adjusting the downstream node X:
in the formulae (14), (15),for adjusting the voltage sensitivity to the voltage out-of-limit node N when the reactive power of the distributed photovoltaic power supply node X is contained at the downstream of the voltage out-of-limit node N in the power distribution network, < + > >To adjust the voltage sensitivity to the voltage threshold crossing node N when the active power of the distributed photovoltaic power supply node X is contained at the downstream of the voltage threshold crossing node N in the power distribution network, V N For the voltage of node N, V X The voltage of the node X is i is the ith node between the node N and the node X downstream of the node N, X i For reactance between node i and node i upstream of node i, R i Is the resistance between node i and the node upstream of node i.
3) The power adjustment of the nodes of the other branches is performed on the voltage sensitivity of the node N, and the calculation mode is as follows:
taking node E reactive power adjustment as an example, firstly calculating the voltage sensitivity of the node E reactive power adjustment to an upstream public connection node 3, and then calculating the voltage sensitivity of the public connection node 3 to a downstream node N;
and calculating the sensitivity of the reactive power adjustment of the node E to the voltage of the node N:
the same thing calculates the sensitivity of the active power adjustment of the node E to the voltage of the node N:
in the formulae (16), (17),for regulating the voltage sensitivity of a power distribution network to a voltage threshold node N when the reactive power of the distributed photovoltaic power supply node E is contained on the branch of the line where said voltage threshold node N is located, < >>To regulate the voltage sensitivity of a voltage threshold node N in a power distribution network when active power containing a distributed photovoltaic power supply node E is applied to a branch of a line where the voltage threshold node N is located, V 3 For the voltage of node 3, V E For the voltage of node E, i is the i-th node from the branch starting node F to node E on the branch where node E is located, X i For reactance between node i and node i upstream of node i, R i The resistance between the node i and the upstream node before the node i is j, i is the j-th node from the node 3 comprising the branch where the node E is positioned and the line where the node N is positioned to the node N, V j For the voltage of node j, V j-1 For the node j immediately preceding the node in the direction from node 3 to node NA voltage.
Based on the power adjustment of the nodes with the distributed photovoltaic power supply in the power distribution network, the voltage sensitivity of each node with the voltage out-of-limit and the voltage out-of-limit value of each node with the voltage out-of-limit are calculated, and the comprehensive voltage sensitivity of each node with the distributed photovoltaic power supply in the power distribution network is calculated;
the electrical data of each node of the power distribution network reported by the intelligent electric meter comprises voltage of each node, power of each node, output of a distributed power supply and state of charge data of an energy storage device.
When the voltages of a plurality of nodes are over-limited, in order to enable the adjustment measures to be orderly carried out and the adjustment measures to be optimal, the comprehensive influence on the voltage sensitivity of different over-limited nodes is required to be considered for carrying out the node power adjustment, and therefore, a comprehensive voltage sensitivity calculation method based on the over-limit degree is provided.
As can be seen from the calculation of the voltage sensitivity of the single point, any node power adjustment can adjust the voltage of all nodes, so that the adjustment efficiency is improved for optimizing adjustment measures, overshoot is avoided, the voltage sensitivity of the node with larger out-of-limit voltage should occupy larger proportion in the comprehensive voltage sensitivity, namely the sensitivity of each node in the comprehensive voltage sensitivity is distributed according to the out-of-limit proportion. Taking the reactive power of the adjustment node 2 as an example, the upper limit of the node N and the node X in the figure 2 is exceeded, the comprehensive voltage sensitivity of the reactive power of the adjustment node 2 is calculated.
From the above analysis, it can be seen that the voltage sensitivity of node N, X when the reactive power of node 2 is regulated isCalculating the voltage threshold DeltaV:
ΔV N ＝V N -V max (18)
ΔV X ＝V X -V max (19)
in the formulae (18), (19), deltaV N And DeltaV X For the voltage threshold value V of the voltage threshold crossing nodes N and X in the power distribution network N And V X The voltage value V of the voltage out-of-limit nodes N and X in the power distribution network max Is the maximum voltage.
The integrated voltage sensitivity in adjusting the reactive power and the active power of node 2 can be expressed as:
in the method, in the process of the invention,for the integrated voltage sensitivity during reactive power regulation of node 2 with distributed photovoltaic power supply in the distribution network, < >>For the comprehensive voltage sensitivity of the power distribution network when the active power of the node 2 containing the distributed photovoltaic power supply is regulated, For the reactive power regulation of node 2 containing a distributed photovoltaic power supply in a power distribution network, the voltage sensitivity to a voltage out-of-limit node N is adjusted,/->The voltage sensitivity to the voltage out-of-limit node X is adjusted for the active power of the node 2 containing the distributed photovoltaic power supply in the power distribution network.
Similarly, when the node 1, 2, 3 … … voltages are out of limit, the integrated voltage sensitivity when adjusting node a reactive power can be expressed as:
in the step 2, the calculation mode of the adjustment cost of the adjustment mode corresponding to the nodes with the same comprehensive voltage sensitivity is as follows:
1) Adjustment cost calculation
The invention mainly adopts photovoltaic inverter regulation and energy storage regulation arrangement regulation measures.
Energy storage device adjusts cost:
the energy storage device achieves the purpose of adjusting node voltage by absorbing active power, and active power on a line is increased and loss is increased when adjusting, so that the adjusting cost is expressed as:
Cost 0 ＝ΔP loss -ΔP ess (21)
wherein DeltaP loss Represents the active loss of the circuit, delta P ess Indicating that the energy storage device absorbs active power.
ΔP loss According to the calculation of (1):
wherein U is N For the rated voltage of the line where the node i is located, P i Active power flowing into node i for the upstream node immediately preceding node i, Q i Reactive power flowing into node i for the upstream node immediately preceding node i, R i Is the resistance between node i and the node upstream of node i.
When line active power is adjusted, ignoring reactive power effects, loss variation can be expressed as:
wherein, delta P is the variation of the active power of the line where the node i is located.
The former term is far greater than the latter term in the molecule, the latter term can be ignored, and the branch active change is ignored, namely each circuit deltap is the same, when node I carries out active power adjustment, the active loss corresponding to different upstream nodes is overlapped, and the method can be used for obtaining:
wherein P is i According to the intelligent ammeter data collected, the line loss is ignored according to the network topology structure, and the active power of all ammeter at the downstream of the node i is overlapped, so that the energy storage adjustment cost can be expressed as:
in the formula, cost 0 For the energy storage device, the cost of the active power of the node T is regulated, delta P is the variation of the active power of the line where the node I is located, U N The rated voltage of the line where the node I is located is I, I is the I node from the line origin to the node I of the line where the node I is located, P i Active power flowing into node i for the upstream node immediately preceding node i, R i For the resistance between node i and the node i upstream of node i, ΔP ess Active power absorbed by the energy storage device.
Photovoltaic inverter power regulation cost:
As can be seen from the study, most photovoltaic inverters can realize decoupling control of active and reactive power at present, that is, can compensate reactive power while emitting active power, as shown in fig. 3, the adjustment cost can be divided into three stages:
the photovoltaic inverter maintains the active power unchanged, and the cost of a reactive power stage is increased;
after the photovoltaic inverter reaches the capacity limit, the power factor angle is regulated, the active power is reduced, and the cost of a reactive power stage is increased;
the photovoltaic inverter reduces the costs of the active and reactive power phases proportionally after the power factor angle reaches a limit.
Stage one: a-b, namely, when the voltage of the active output at the point a exceeds the limit, the active output is maintained unchanged, reactive compensation is added, and the cost at the stage is calculated as follows:
Cost 1 ＝ΔP loss (26)
according to the above reasoning, when node I performs the first stage reactive power regulation of the inverter, its cost can be expressed as:
in the formula, cost 1 The cost of the reactive compensation stage is increased for maintaining the active power of the photovoltaic inverter unchanged, delta Q is the reactive power variation of the line where the node I is located, U N The rated voltage of the line where the node I is located is I, I is the I node from the line origin to the node I of the line where the node I is located, Q i Reactive power flowing into node i for the upstream node immediately preceding node i, R i Is the resistance between node i and the node upstream of node i.
Stage two: b-c, namely after the inverter reaches the capacity limit, carrying out power factor angle adjustment, reducing the active power, and increasing the reactive power, wherein the cost at the stage is calculated as follows:
Cost 2 ＝ΔP loss +ΔP (28)
and (3) further finishing to obtain:
in the formula, cost 2 The cost of reactive power stage is increased while the active power is reduced for the photovoltaic inverter by adjusting the power factor angle after the capacity limit is reached, delta P is the active power variation of the line where node I is located, U N The rated voltage of the line where the node I is located is I, I is the I node from the line origin to the node I of the line where the node I is located, P i Active power flowing into node i for the upstream node immediately preceding node i, R i For the resistance between the node I and the upstream node before the node I, deltaQ is the reactive power variation of the line where the node I is located, Q i Reactive power flows into node i for the upstream node immediately preceding node i.
Stage three: after c, i.e. when the power factor angle reaches the limit, the active and reactive power are reduced proportionally, the cost at this stage being calculated as:
Cost 3 ＝ΔP loss +ΔP (30)
and (3) further finishing to obtain:
in the formula, cost 3 For the photovoltaic inverter to proportionally reduce the cost of active power and reactive power stages after the power factor angle reaches the limit, delta P is the active power variation of the line where the node I is positioned, U N The rated voltage of the line where the node I is located is I, I is the I node from the line origin to the node I of the line where the node I is located, P i Active power flowing into node i for the upstream node immediately preceding node i, R i For the resistance between the node I and the upstream node before the node I, deltaQ is the reactive power variation of the line where the node I is located, Q i Reactive power flows into node i for the upstream node immediately preceding node i.
2) Voltage control strategy
Based on the above researches on comprehensive sensitivity, the embodiment adopts a point-by-point regulation and control method, namely, the active regulation of the energy storage node and the regulation of the optical Fu Jiedian inverter are respectively ordered according to the comprehensive voltage sensitivity, and adopts a cost minimum control method in four regulation and control methods (three stages of the active regulation of the energy storage node and the regulation of the optical Fu Jiedian inverter) on the basis of equivalent regulation, after the regulation measures of the node with the highest sensitivity and the cost minimum are used up, the comprehensive sensitivity of other nodes is reordered, and the regulation is carried out again point by point until the voltage of each node in the power distribution network is no longer out of limit.
Since both the second and third inverter stages involve photovoltaic active output reduction, the inverter second and third stage regulation may be collectively referred to as inverter active regulation, and the inverter first stage regulation may be referred to as inverter reactive regulation, based on which the cost-effective regulation measures proposed by the embodiments may be divided into three stages:
The first stage: the energy storage adjustment and the reactive power adjustment of the inverter have adjustment allowance, and the adjustment cost is smaller than that of the active power adjustment of the inverter, and then the energy storage adjustment and the reactive power adjustment of the inverter are adopted (the sum is used herein because the energy storage active power adjustment alone or the reactive power adjustment of the photovoltaic inverter may not meet the requirements, and therefore, two modes of combination may be needed).
And a second stage: the energy storage regulation and the reactive power regulation of the inverter have the regulation allowance, but the regulation cost is greater than or equal to the reactive power regulation of the inverter, at the moment, if the energy storage device regulation or the reactive power regulation of the inverter is carried out, the energy storage device regulation or the reactive power regulation of the inverter is equivalent to the fact that the photovoltaic is more effective in line loss, namely a power grid company receives the photovoltaic to enter the network, but the photovoltaic is effective in line loss, therefore, the inverter is provided for the process of the process, meanwhile, the side equipment calculates the regulation quantity and the regulation time, and the like to compensate the user, so that the line loss is reduced, the income of the user is ensured, and the regulation measures are saved;
and a third stage: and if the energy storage adjustment and the reactive power of the inverter have no adjustment allowance, the inverter is subjected to active adjustment, but the cut-down photovoltaic output is not complemented in the stage.
The embodiment designs a practical calculation method of voltage sensitivity, provides comprehensive voltage sensitivity description distributed resource regulation and control capability, and provides a calculation method for voltage adjustment under the power distribution Internet of things;
The voltage regulation and control method considering the cost is also designed, and the balance of larger photovoltaic power generation, smaller system loss and more benefits of users is realized while the system voltage is controlled.
Example 2:
the flow chart of the voltage regulation measure under the photovoltaic high permeability based on the intelligent terminal of the platform area provided by the embodiment is shown in fig. 4, and the specific steps include:
1) Collecting the capacity S of a photovoltaic inverter in a model of a intelligent terminal of a platform area when a photovoltaic energy storage device is connected to the platform area pv.max Maximum power factor angle delta pv.max Load capacity limit value S of energy storage device ess.min ，S ess.max ]Rated active power P ess.N And node voltage limit V min ，V max ]Simultaneously updating topological structure and calculating node admittanceMatrix and node impedance matrix.
2) Node voltage, power and distributed power output (P) are reported to edge equipment every 5 minutes through intelligent ammeter pv ，Q pv ) The intelligent terminal of the platform area calculates voltage sensitivity of the distributed resource node to other nodes, sum of downstream user power of each node and maximum adjustable reactive power Q of the photovoltaic inverter in the first stage according to the collected information pv.max It is calculated as follows:
3) When the voltage of the node is beyond the limit, the intelligent ammeter is used for actively reporting, and the voltage delta V required to be regulated by each node is calculated i (i.e. the voltage is more limited), since the voltage is slowly changed, the voltage sensitivity calculated by the last acquisition point can be used for calculation;
4) Calculating the comprehensive voltage sensitivity, respectively finding out the node with the maximum comprehensive voltage sensitivity in reactive power regulation and active power regulation of an energy storage device of the currently available photovoltaic inverter, and calculating the regulation delta V under the comprehensive voltage sensitivity i Reactive power and active power are required to be adjusted;
5) Determining and adjusting DeltaV i Reactive power required by reactive power adjustment of inverter is smaller than maximum adjustable reactive power Q of reactive power adjustment of inverter pv.max And adjust DeltaV i The active power required by the energy storage active power adjustment is smaller than the rated active power P of the energy storage device ess.N Whether or not to establish;
6) If 5) is established, calculating reactive power adjustment cost of the inverter and adjustment cost of the energy storage device, calculating active power adjustment quantity and adjustment cost of the inverter according to maximum sensitivity, executing with minimum cost according to four methods, and ending operation;
if 5) is not true, calculate P ess.N Q and Q pv.max Corresponding DeltaV ess.N (amount of voltage adjustment of energy storage device) and DeltaV pv.max (voltage adjustment amount of photovoltaic inverter), and ΔV is set i+1 ＝min(ΔV ess.N 、ΔV pv.max ) Then calculate the regulated voltage DeltaV i+1 When the method is used, the adjustment quantity and the adjustment cost of four adjustment methods are calculated according to the maximum comprehensive sensitivity, and the method is executed according to the minimum cost;
7) Since the integrated voltage sensitivity changes after selecting the adjustment method and adjusting every time a cycle is executed, it is necessary to redetermine the node with the highest integrated sensitivity currently available, remove the node without adjustment capability, and let DeltaV i ＝ΔV i -ΔV i+1 I=i+1, step 4) -step 7) is performed in a loop.
Example 3:
based on the same inventive concept, the invention also provides a photovoltaic high-permeability lower voltage control system based on the intelligent terminal of the platform region, as shown in fig. 5, comprising: the system comprises a comprehensive voltage sensitivity module, a sequencing module and a power adjusting module;
the comprehensive voltage sensitivity module is used for calculating the voltage limit value of each node with voltage limit crossing in the power distribution network and the comprehensive voltage sensitivity of each node with distributed photovoltaic power supply during power adjustment based on the electrical data of each node of the power distribution network reported by the intelligent ammeter when the voltage of each node in the power distribution network is over-limit;
the sequencing module is used for respectively selecting the node with the maximum comprehensive voltage sensitivity in different regulation modes of the distributed photovoltaic power supply, calculating the regulation cost of the regulation mode corresponding to the node on the basis of equivalent regulation, and selecting the regulation mode with the minimum regulation cost for power regulation;
The power adjusting module is used for recalculating the comprehensive voltage sensitivity and the adjusting cost of each available node containing the distributed photovoltaic power supply after the node adjustable power with the minimum adjusting cost is used up, and adjusting the power until the voltage of each node is no longer out of limit;
the node containing the distributed photovoltaic power supply comprises an energy storage device node and a photovoltaic inverter node, the adjusting mode comprises energy storage device active adjustment, photovoltaic inverter active adjustment and photovoltaic inverter reactive adjustment, and the adjusting cost comprises adjusting cost of the photovoltaic inverter and adjusting cost of the energy storage device.
The comprehensive voltage sensitivity module is specifically used for:
the intelligent terminal of the transformer area obtains a Jacobian matrix by utilizing a Newton-Laportson method based on the electric data of each node of the power distribution network reported by the intelligent ammeter, and calculates the voltage sensitivity of each node containing the distributed photovoltaic power supply in the power distribution network to each voltage out-of-limit node;
the intelligent terminal of the platform area calculates the voltage threshold value of each node with voltage threshold exceeding in the power distribution network based on the electrical data of each node of the power distribution network reported by the intelligent ammeter;
based on the power adjustment of the nodes with the distributed photovoltaic power supply in the power distribution network, the voltage sensitivity of each node with the voltage out-of-limit and the voltage out-of-limit value of each node with the voltage out-of-limit are calculated, and the comprehensive voltage sensitivity of each node with the distributed photovoltaic power supply in the power distribution network is calculated;
The electrical data of each node of the power distribution network reported by the intelligent electric meter comprises voltage of each node, power of each node, output of a distributed power supply and state of charge data of an energy storage device.
Each power distribution network comprises comprehensive voltage sensitivity during power adjustment of distributed photovoltaic power supply nodes, and the comprehensive voltage sensitivity is calculated according to the following formula:
in the method, in the process of the invention,for the integrated voltage sensitivity during reactive power regulation of node H containing distributed photovoltaic power in the distribution network, < >>For distribution networkThe comprehensive voltage sensitivity of the node H containing the distributed photovoltaic power supply during active power adjustment is m, which is the number of all voltage out-of-limit nodes in the power distribution network, and delta V k The voltage of the kth voltage out-of-limit node in the power distribution network is the more limited value,for the reactive power regulation of node H containing a distributed photovoltaic power supply in a power distribution network, the voltage sensitivity to the kth voltage out-of-limit node is adjusted, < >>The voltage sensitivity of a kth voltage out-of-limit node is adjusted for the active power of a node H containing a distributed photovoltaic power supply in the power distribution network;
the voltage threshold value of the kth voltage threshold-exceeding node in the power distribution network is calculated according to the following formula:
ΔV k ＝V k -V max
wherein V is k V is the voltage value of the kth voltage out-of-limit node in the power distribution network max Is the maximum voltage.
The method for calculating the voltage sensitivity of each power regulation pair of the distributed photovoltaic power supply node in the power distribution network to each voltage out-of-limit node comprises the following steps:
For each distributed photovoltaic power supply node in the power distribution network, respectively calculating the voltage sensitivity of power regulation on each voltage threshold crossing node when the distributed photovoltaic power supply node is an upstream node and a downstream node of the voltage threshold crossing node and a node on a branch of a line where the node is positioned;
the upstream node of the voltage limit crossing node is a rest node on a line which is led out from the distribution transformer, passes through the voltage limit crossing node and reaches a terminal node of the distribution network, and is removed from the voltage limit crossing node;
and the downstream nodes of the voltage limit crossing nodes are the rest nodes including the end nodes of the power distribution network on the line between the voltage limit crossing nodes and the end nodes of the power distribution network except the voltage limit crossing nodes.
When the distributed photovoltaic power supply-containing node is an upstream node of the voltage limit crossing node, the voltage sensitivity of the power adjustment to each voltage limit crossing node is calculated according to the following formula:
in the method, in the process of the invention,for adjusting the voltage sensitivity to the voltage out-of-limit node N when the upstream of the voltage out-of-limit node N in the power distribution network contains the reactive power of the distributed photovoltaic power supply node A, < >>In order to adjust the voltage sensitivity of the power distribution network to the voltage out-of-limit node N when the upstream of the voltage out-of-limit node N contains the active power of the distributed photovoltaic power supply node A, j is the adjacent node of the node A, N is the number of the nodes adjacent to the node A, and V j For the voltage of node j, G Aj For conductance between node A and node j, B Aj Delta is the susceptance between node A and node j Aj For the power angle between node A and node j, V A For the voltage of node A, B AA For susceptance between node A and node A, i is the ith node, V, between node N and node A upstream of node N i For the voltage of node i, V i-1 Is the voltage of the node immediately upstream of node i.
When the distributed photovoltaic power supply-containing node is a downstream node of the voltage limit crossing node, the voltage sensitivity of the power adjustment to each voltage limit crossing node is calculated according to the following formula:
in the method, in the process of the invention,for adjusting the voltage sensitivity to the voltage out-of-limit node N when the reactive power of the distributed photovoltaic power supply node Y is contained at the downstream of the voltage out-of-limit node N in the power distribution network, < + >>To adjust the voltage sensitivity to the voltage threshold crossing node N when the active power of the distributed photovoltaic power supply node Y is contained at the downstream of the voltage threshold crossing node N in the power distribution network, V N For the voltage of node N, V Y For the voltage of node Y, +.>Partial derivative of reactive power sent by node Y distributed photovoltaic power supply to voltage, +.>For the partial derivative of active power to voltage, l is the first node from node N to node Y downstream of node N, X l For reactance between node l and node l immediately upstream, R l The resistance between node l and the node upstream of node l.
When the distributed photovoltaic power supply-containing node is a node on a branch of a line where the voltage limit crossing node is located, the voltage sensitivity of the power adjustment to each voltage limit crossing node is calculated according to the following formula:
in the method, in the process of the invention,for regulating the voltage sensitivity of a power distribution network to a voltage threshold node N when the reactive power of the distributed photovoltaic power supply node E is contained on the branch of the line where said voltage threshold node N is located, < >>To regulate the voltage sensitivity of a voltage threshold node N in a power distribution network when active power containing a distributed photovoltaic power supply node E is applied to a branch of a line where the voltage threshold node N is located, V C For the voltage of node C, V E For the voltage of node E, +.>Partial derivative of reactive power to voltage for node E distributed photovoltaic power supply, +.>For the partial derivative of active power to voltage, r is the r node from the branch starting node F to the node E on the branch where the node E is located, X r For reactance between node R and the node upstream of node R, R r The resistance between the node r and the upstream node before the node r is that s is the s-th node from the node C to the node N, V, wherein the s-th node comprises the node N, the branch circuit where the node E is positioned and the line where the node N is positioned s For the voltage at node s, V s-1 Is the voltage of the node preceding node s in the direction from node C to node N.
The adjustment cost of the energy storage device is calculated according to the following formula:
in the formula, cost 0 The cost of the energy storage device in adjusting the active power of the node T is delta P, which is the change of the active power of the line where the node T is locatedQuantity U N The rated voltage of the line where the node T is located is T, the T is the T-th node from the line origin to the node T, and P t Active power flowing into node t for the upstream node before node t, R t For the resistance between node t and the node immediately upstream of node t, ΔP ess Active power absorbed by the energy storage device.
The regulation cost of the photovoltaic inverter comprises:
the photovoltaic inverter maintains the active power unchanged, and the cost of a reactive power stage is increased;
after the photovoltaic inverter reaches the capacity limit, the power factor angle is regulated, the active power is reduced, and the cost of a reactive power stage is increased;
the photovoltaic inverter reduces the costs of the active and reactive power phases proportionally after the power factor angle reaches a limit.
The photovoltaic inverter maintains the active power unchanged, increases the cost of the reactive power stage, and is calculated according to the following formula:
in the formula, cost 1 The cost of the reactive compensation stage is increased for maintaining the active power of the photovoltaic inverter unchanged, delta Q is the reactive power variation of the line where the node T is located, U N The rated voltage of the line where the node T is located, T is the T-th node from the line origin to the node T of the line where the node T is located, Q t Reactive power flowing into node t for the node upstream of node t, R t Is the resistance between node t and the node immediately upstream of node t.
After the photovoltaic inverter reaches the capacity limit, the power factor angle is adjusted, the active power is reduced, the cost of a reactive power stage is increased, and the photovoltaic inverter is calculated according to the following formula:
in Cost 2 The cost of reactive power stage is increased while the active power is reduced for the photovoltaic inverter by adjusting the power factor angle after the capacity limit is reached, delta P is the active power variation of the line where node T is located, U N The rated voltage of the line where the node T is located is T, the T is the T-th node from the line origin to the node T, and P t Active power flowing into node t for the upstream node before node t, R t For the resistance between the node T and the upstream node before the node T, deltaQ is the reactive power variation of the line where the node T is located, Q t Reactive power flows into node t for the node upstream of node t.
After the power factor angle reaches the limit, the photovoltaic inverter reduces the cost of active power and reactive power stages proportionally, and is calculated according to the following formula:
in the formula, cost 3 For the photovoltaic inverter to proportionally reduce the cost of active power and reactive power stages after the power factor angle reaches the limit, delta P is the active power variation of the line where the node T is located, U N The rated voltage of the line where the node T is located is T, the T is the T-th node from the line origin to the node T, and P t Active power flowing into node t for the upstream node before node t, R t For the resistance between the node T and the upstream node before the node T, deltaQ is the reactive power variation of the line where the node T is located, Q t Reactive power flows into node t for the node upstream of node t.
On the basis of equivalent adjustment, the adjustment cost of the corresponding node adjustment mode is calculated, and the method comprises the following steps:
based on the comprehensive voltage sensitivity, different adjustment modes achieve the same voltage effect by adjusting power, and the adjustment cost is generated.
The intelligent terminal of the platform area is provided with a topology model of the power distribution network, and the topology model is used for calculating the voltage limit value of each node with voltage limit exceeding in the power distribution network, the comprehensive voltage sensitivity of each node containing a distributed photovoltaic power supply during power adjustment, the power adjustment quantity and the adjustment cost required by adjusting the voltage limit value of each node under the maximum value of the comprehensive voltage sensitivity; and the device is used for storing the capacity of the photovoltaic inverter, the maximum power factor angle of the photovoltaic inverter, the active adjustment allowance of the photovoltaic inverter, the reactive adjustment allowance of the photovoltaic inverter, the limit value of the charge capacity of the energy storage device, the rated active power of the energy storage device, the active adjustment allowance of the energy storage device and the limit value of each node voltage.
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 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.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of protection thereof, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: various changes, modifications, or equivalents may be made to the particular embodiments of the invention by those skilled in the art after reading the present disclosure, but such changes, modifications, or equivalents are within the scope of the invention as defined in the appended claims.

Claims (9)

1. A photovoltaic high-permeability lower voltage control method based on a platform area intelligent terminal is characterized by comprising the following steps:
when node voltage exceeding occurs in the power distribution network, the intelligent terminal of the platform area calculates the voltage exceeding limit value of each node with voltage exceeding limit in the power distribution network and the comprehensive voltage sensitivity of each node with distributed photovoltaic power supply during power adjustment based on the electrical data of each node of the power distribution network reported by the intelligent ammeter;
respectively selecting nodes with the maximum comprehensive voltage sensitivity in different adjustment modes of the distributed photovoltaic power supply, calculating the adjustment cost of the adjustment mode of the corresponding nodes on the basis of equivalent adjustment, and selecting the adjustment mode with the minimum adjustment cost for power adjustment;
when the node adjustable power with the minimum adjustment cost is used up, the comprehensive voltage sensitivity and the adjustment cost of each available node containing the distributed photovoltaic power supply are recalculated, and power adjustment is carried out until the voltage of each node is not out of limit;
the node containing the distributed photovoltaic power supply comprises an energy storage device node and a photovoltaic inverter node, the adjusting mode comprises active energy storage device adjustment, active photovoltaic inverter adjustment and reactive photovoltaic inverter adjustment, and the adjusting cost comprises adjusting cost of the photovoltaic inverter and adjusting cost of the energy storage device;
The intelligent terminal of the platform area calculates the voltage limit value of each node with voltage limit exceeding in the power distribution network based on the electric data of each node of the power distribution network reported by the intelligent ammeter, and calculates the comprehensive voltage sensitivity of each node with distributed photovoltaic power supply during power adjustment, and the intelligent terminal comprises:
the intelligent terminal of the transformer area obtains a Jacobian matrix by utilizing a Newton-Laportson method based on the electric data of each node of the power distribution network reported by the intelligent ammeter, and calculates the voltage sensitivity of each node containing the distributed photovoltaic power supply in the power distribution network to each voltage out-of-limit node;
the intelligent terminal of the platform area calculates the voltage threshold value of each node with voltage threshold exceeding in the power distribution network based on the electrical data of each node of the power distribution network reported by the intelligent ammeter;
based on the power adjustment of the nodes with the distributed photovoltaic power supply in the power distribution network, the voltage sensitivity of each node with the voltage out-of-limit and the voltage out-of-limit value of each node with the voltage out-of-limit are calculated, and the comprehensive voltage sensitivity of each node with the distributed photovoltaic power supply in the power distribution network is calculated;
the electrical data of each node of the power distribution network reported by the intelligent electric meter comprises voltage of each node, power of each node, output of a distributed power supply and state of charge data of an energy storage device;
The comprehensive voltage sensitivity of each distributed photovoltaic power supply node during power adjustment is calculated according to the following formula:
in the method, in the process of the invention,for the integrated voltage sensitivity during reactive power regulation of node H containing distributed photovoltaic power in the distribution network, < >>For the comprehensive voltage sensitivity of the power distribution network including the active power adjustment of the node H of the distributed photovoltaic power supply, m is the number of all voltage out-of-limit nodes in the power distribution network, and DeltaV k The voltage of the kth voltage out-of-limit node in the power distribution network is the more limited value,for the reactive power regulation of node H containing a distributed photovoltaic power supply in a power distribution network, the voltage sensitivity to the kth voltage out-of-limit node is adjusted, < >>The voltage sensitivity of a kth voltage out-of-limit node is adjusted for the active power of a node H containing a distributed photovoltaic power supply in the power distribution network;
the voltage threshold value of the kth voltage threshold-exceeding node in the power distribution network is calculated according to the following formula:
ΔV k ＝V k -V max
wherein V is k V is the voltage value of the kth voltage out-of-limit node in the power distribution network max Is the maximum voltage;
the method for calculating the voltage sensitivity of each power regulation pair of the distributed photovoltaic power supply node in the power distribution network to each voltage out-of-limit node comprises the following steps:
for each distributed photovoltaic power supply node in the power distribution network, respectively calculating the voltage sensitivity of power regulation on each voltage threshold crossing node when the distributed photovoltaic power supply node is an upstream node and a downstream node of the voltage threshold crossing node and a node on a branch of a line where the node is positioned;
The upstream node of the voltage limit crossing node is a rest node on a line which is led out from the distribution transformer, passes through the voltage limit crossing node and reaches a terminal node of the distribution network, and is removed from the voltage limit crossing node;
the downstream node of the voltage out-of-limit node is the other nodes including the end node of the power distribution network on the line between the voltage out-of-limit node and the end node of the power distribution network except the voltage out-of-limit node;
when the distributed photovoltaic power supply-containing node is an upstream node of the voltage limit crossing node, the voltage sensitivity of the power adjustment to each voltage limit crossing node is calculated according to the following formula:
in the method, in the process of the invention,for adjusting the voltage sensitivity to the voltage out-of-limit node N when the upstream of the voltage out-of-limit node N in the power distribution network contains the reactive power of the distributed photovoltaic power supply node A, < >>In order to adjust the voltage sensitivity of the power distribution network to the voltage out-of-limit node N when the upstream of the voltage out-of-limit node N contains the active power of the distributed photovoltaic power supply node A, j is the adjacent node of the node A, N is the number of the nodes adjacent to the node A, and V j For the voltage of node j, G Aj For conductance between node A and node j, B Aj Delta is the susceptance between node A and node j Aj For the power angle between node A and node j, V A For the voltage of node A, B AA For susceptances between node A and node A, i is a node comprising node N, nodeThe ith node, V, between point N and node N upstream node A i For the voltage of node i, V i-1 The voltage of the upstream node before the node i;
when the distributed photovoltaic power supply-containing node is a downstream node of the voltage limit crossing node, the voltage sensitivity of the power adjustment to each voltage limit crossing node is calculated according to the following formula:
in the method, in the process of the invention,for adjusting the voltage sensitivity to the voltage out-of-limit node N when the reactive power of the distributed photovoltaic power supply node Y is contained at the downstream of the voltage out-of-limit node N in the power distribution network, < + >>To adjust the voltage sensitivity to the voltage threshold crossing node N when the active power of the distributed photovoltaic power supply node Y is contained at the downstream of the voltage threshold crossing node N in the power distribution network, V N For the voltage of node N, V Y For the voltage of node Y, +.>Partial derivative of reactive power sent by node Y distributed photovoltaic power supply to voltage, +.>For the partial derivative of active power to voltage, l is the first node from node N to node Y downstream of node N, X l For reactance between node l and node l immediately upstream, R l For node l and before node lA resistance between upstream nodes;
when the distributed photovoltaic power supply-containing node is a node on a branch of a line where the voltage limit crossing node is located, the voltage sensitivity of the power adjustment to each voltage limit crossing node is calculated according to the following formula:
in the method, in the process of the invention,for regulating the voltage sensitivity of a power distribution network to a voltage threshold node N when the reactive power of the distributed photovoltaic power supply node E is contained on the branch of the line where said voltage threshold node N is located, < >>To regulate the voltage sensitivity of a voltage threshold node N in a power distribution network when active power containing a distributed photovoltaic power supply node E is applied to a branch of a line where the voltage threshold node N is located, V C For the voltage of node C, V E For the voltage of node E, +.>Partial derivative of reactive power to voltage for node E distributed photovoltaic power supply, +.>For the partial derivative of active power to voltage, r is the r node from the branch starting node F to the node E on the branch where the node E is located, X r For reactance between node R and the node upstream of node R, R r Between node r and the upstream node before node rS is the s-th node, V, of the connection node C comprising the branch where the node E is located and the line where the node N is located to the node N s For the voltage at node s, V s-1 Is the voltage of the node preceding node s in the direction from node C to node N.
2. The method of claim 1, wherein the cost of adjustment of the energy storage device is calculated as:
in the formula, cost 0 For the energy storage device, the cost of the active power of the node T is regulated, delta P is the variation of the active power of the line where the node T is located, U N The rated voltage of the line where the node T is located is T, the T is the T-th node from the line origin to the node T, and P t Active power flowing into node t for the upstream node before node t, R t For the resistance between node t and the node immediately upstream of node t, ΔP ess Active power absorbed by the energy storage device.
3. The method of claim 1, wherein the adjusting cost of the photovoltaic inverter comprises:
the photovoltaic inverter maintains the active power unchanged, and the cost of a reactive power stage is increased;
after the photovoltaic inverter reaches the capacity limit, the power factor angle is regulated, the active power is reduced, and the cost of a reactive power stage is increased;
the photovoltaic inverter reduces the costs of the active and reactive power phases proportionally after the power factor angle reaches a limit.
4. The method of claim 3, wherein the photovoltaic inverter maintains active power unchanged, increasing the cost of the reactive power phase, calculated as:
In the formula, cost 1 The cost of the reactive compensation stage is increased for maintaining the active power of the photovoltaic inverter unchanged, delta Q is the reactive power variation of the line where the node T is located, U N The rated voltage of the line where the node T is located, T is the T-th node from the line origin to the node T of the line where the node T is located, Q t Reactive power flowing into node t for the node upstream of node t, R t Is the resistance between node t and the node immediately upstream of node t.
5. The method of claim 3, wherein the photovoltaic inverter adjusts the power factor angle after reaching the capacity limit, reduces the active power while increasing the cost of the reactive power phase, calculated as:
in the formula, cost 2 The cost of reactive power stage is increased while the active power is reduced for the photovoltaic inverter by adjusting the power factor angle after the capacity limit is reached, delta P is the active power variation of the line where node T is located, U N The rated voltage of the line where the node T is located is T, the T is the T-th node from the line origin to the node T, and P t Active power flowing into node t for the upstream node before node t, R t For the resistance between the node T and the upstream node before the node T, deltaQ is the reactive power variation of the line where the node T is located, Q t Reactive power flows into node t for the node upstream of node t.
6. The method of claim 3, wherein the photovoltaic inverter is scaled down in cost for the active and reactive power phases after the power factor angle reaches a limit, calculated as:
in the formula, cost 3 For the photovoltaic inverter to proportionally reduce the cost of active power and reactive power stages after the power factor angle reaches the limit, delta P is the active power variation of the line where the node T is located, U N The rated voltage of the line where the node T is located is T, the T is the T-th node from the line origin to the node T, and P t Active power flowing into node t for the upstream node before node t, R t For the resistance between the node T and the upstream node before the node T, deltaQ is the reactive power variation of the line where the node T is located, Q t Reactive power flows into node t for the node upstream of node t.
7. The method of claim 1, wherein calculating the adjustment cost for the corresponding node adjustment mode based on the equivalent adjustment comprises:
based on the comprehensive voltage sensitivity, different adjustment modes achieve the same voltage effect by adjusting power, and the adjustment cost is generated.
8. The method of claim 1, wherein the intelligent terminal of the transformer area has a topology model of the power distribution network, and the topology model is used for calculating the voltage threshold value of each node with voltage threshold crossing in the power distribution network, the comprehensive voltage sensitivity of each node containing the distributed photovoltaic power supply during power adjustment, the power adjustment amount and the adjustment cost required for adjusting the voltage threshold value of each node under the maximum value of the comprehensive voltage sensitivity; and the device is used for storing the capacity of the photovoltaic inverter, the maximum power factor angle of the photovoltaic inverter, the active adjustment allowance of the photovoltaic inverter, the reactive adjustment allowance of the photovoltaic inverter, the limit value of the charge capacity of the energy storage device, the rated active power of the energy storage device, the active adjustment allowance of the energy storage device and the limit value of each node voltage.
9. A photovoltaic high-permeability lower voltage control system based on a zone intelligent terminal, for implementing the photovoltaic high-permeability lower voltage control method based on a zone intelligent terminal as set forth in any one of claims 1 to 8, comprising: the system comprises a comprehensive voltage sensitivity module, a sequencing module and a power adjusting module;
the comprehensive voltage sensitivity module is used for calculating the voltage limit value of each node with voltage limit crossing in the power distribution network and the comprehensive voltage sensitivity of each node with distributed photovoltaic power supply during power adjustment based on the electrical data of each node of the power distribution network reported by the intelligent ammeter when the voltage of each node in the power distribution network is over-limit;
The sequencing module is used for respectively selecting the node with the maximum comprehensive voltage sensitivity in different regulation modes of the distributed photovoltaic power supply, calculating the regulation cost of the regulation mode corresponding to the node on the basis of equivalent regulation, and selecting the regulation mode with the minimum regulation cost for power regulation;
the power adjusting module is used for recalculating the comprehensive voltage sensitivity and the adjusting cost of each available node containing the distributed photovoltaic power supply after the node adjustable power with the minimum adjusting cost is used up, and adjusting the power until the voltage of each node is no longer out of limit;
the node containing the distributed photovoltaic power supply comprises an energy storage device node and a photovoltaic inverter node, the adjusting mode comprises active energy storage device adjustment, active photovoltaic inverter adjustment and reactive photovoltaic inverter adjustment, and the adjusting cost comprises adjusting cost of the photovoltaic inverter and adjusting cost of the energy storage device;
the comprehensive voltage sensitivity of each node power adjustment with the distributed photovoltaic power supply is calculated according to the following formula:
in the method, in the process of the invention,for the integrated voltage sensitivity during reactive power regulation of node H containing distributed photovoltaic power in the distribution network, < >>For the comprehensive voltage sensitivity of the power distribution network including the active power adjustment of the node H of the distributed photovoltaic power supply, m is the number of all voltage out-of-limit nodes in the power distribution network, and DeltaV k For the voltage threshold value of the kth voltage threshold node in the power distribution network, < >>The voltage sensitivity to the kth voltage out-of-limit node is adjusted for the node H reactive power containing the distributed photovoltaic power in the distribution network,the voltage sensitivity of a kth voltage out-of-limit node is adjusted for the active power of a node H containing a distributed photovoltaic power supply in the power distribution network;
the voltage threshold value of the kth voltage threshold-exceeding node in the power distribution network is calculated according to the following formula:
ΔV k ＝V k -V max
wherein V is k V is the voltage value of the kth voltage out-of-limit node in the power distribution network max Is the maximum voltage.
CN202111098975.9A 2021-09-18 2021-09-18 Photovoltaic high-permeability voltage control method and system based on intelligent terminal of transformer area Active CN114123355B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109004653A (en) * 2018-09-07 2018-12-14 东北大学 A kind of active reactive coupling improvement photovoltaic access causes the method for rural power grids overvoltage
CN112994097A (en) * 2021-03-04 2021-06-18 河北工业大学 High-proportion distributed photovoltaic cooperative control method based on intelligent distribution transformer terminal system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109004653A (en) * 2018-09-07 2018-12-14 东北大学 A kind of active reactive coupling improvement photovoltaic access causes the method for rural power grids overvoltage
CN112994097A (en) * 2021-03-04 2021-06-18 河北工业大学 High-proportion distributed photovoltaic cooperative control method based on intelligent distribution transformer terminal system

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