CN111313482B - Photovoltaic power supply active power regulation and control method considering economic safety optimization of power distribution network - Google Patents

Photovoltaic power supply active power regulation and control method considering economic safety optimization of power distribution network Download PDF

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CN111313482B
CN111313482B CN202010110916.8A CN202010110916A CN111313482B CN 111313482 B CN111313482 B CN 111313482B CN 202010110916 A CN202010110916 A CN 202010110916A CN 111313482 B CN111313482 B CN 111313482B
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distribution network
power
power distribution
photovoltaic
power supply
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CN111313482A (en
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韩平平
周福平
杨之俊
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Hefei University of Technology
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Hefei University of Technology
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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
    • H02J3/38—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
    • 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

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Abstract

The invention discloses a photovoltaic power supply active power regulation and control method considering economic safety optimization of a power distribution network, which comprises the following steps of: 1, acquiring a voltage actual value of a power distribution network node, and calculating active power and reactive power of the node; 2, calculating branch active loss indexes of the power distribution network; 3, calculating a voltage deviation index of the power distribution network node; 4, establishing a target function considering the economy, reliability and photovoltaic absorption capacity of the power distribution network; 5, determining constraint conditions of the operation of the power system under the background of the photovoltaic power supply access to the power distribution network; and 6, solving the photovoltaic power supply active power regulation and control model for calculating the economic safety optimization of the power distribution network through a linear programming algorithm, and further solving the active power optimization value of the photovoltaic power supply. The photovoltaic power supply control method and the photovoltaic power supply control system can effectively improve the economy, reliability and photovoltaic consumption level of the photovoltaic power supply connected to the power distribution network, can ensure the safe and stable operation of the power distribution network, and improve the consumption capacity of the photovoltaic power supply in the power distribution network.

Description

Photovoltaic power supply active power regulation and control method considering economic safety optimization of power distribution network
Technical Field
The invention relates to the field of power regulation of a power distribution network of a power system, in particular to a photovoltaic power supply power regulation and control method considering the economy and safety optimization of the power distribution network.
Background
With the increasing scale of the grid-connected installation of the photovoltaic power supply, the problem of large peak load pressure of the power distribution network is relieved to a certain extent. However, the output of the photovoltaic power supply has fluctuation and indirection, and compared with the traditional thermal power, the photovoltaic power supply is connected to the grid to cause the condition of operating power fluctuation and voltage deviation of a power system, so that the line loss of the power distribution network is increased, and the electric energy quality of the power distribution network is reduced. Although the new energy grid-connected technology at the present stage has achieved certain research results in the aspect of photovoltaic power supply power regulation, research is lacked for power system regulation strategies which comprehensively consider the operation economy, safety and photovoltaic absorption capacity of a power distribution network.
For the research on the operation optimization of a power system under the background of photovoltaic power supply access to a power distribution network, the existing achievements mainly focus on the index optimization aspect of the stable operation of the power distribution network, the domestic research mostly uses the safety and stability index of the operation of the power distribution network as a research object to evaluate the operation of the power distribution network, but the application of an evaluation result cannot obviously improve the current situation of difficult photovoltaic power supply consumption. In the aspect of dispatching and running of an electric power system, domestic research mainly focuses on the problem of improving the consumption capacity of a photovoltaic power supply, a research model is lack of consideration on the safety and reliability of running of a power distribution network, and the situation that the safety and stability indexes of running of the power distribution network are poor still exists during the photovoltaic grid connection period.
Disclosure of Invention
The invention provides a photovoltaic power supply active power regulation and control method considering the optimization of the economic safety of a power distribution network, aiming at solving the defects of the prior art, so that the active power of the photovoltaic power supply of the power distribution network can be accurately regulated and controlled, the aims of maximizing the output of the photovoltaic power supply, stabilizing the node voltage of the power distribution network and minimizing the branch loss can be fulfilled, and a basis and a reference are provided for the safe and stable operation of the photovoltaic power supply connected into the power distribution network.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention relates to a photovoltaic power supply active power regulation and control method considering the optimization of the economic safety of a power distribution network, which is characterized in that different nodes of the power distribution network are connected with a photovoltaic power supply, a thermal power generating unit and a load, and the photovoltaic power supply active power regulation and control method is carried out according to the following steps:
step 1, acquiring a voltage actual value of a power distribution network node, and calculating active power and reactive power of the power distribution network node;
the number of branches of the power distribution network is assumed to be N, the number of nodes is N +1, wherein the public connection point of the power distribution network and a superior power grid is marked as a 0 th node, and the tail end node of the ith branch is an ith node; pi、QiRespectively the active power and the reactive power which flow out from the ith node along the tide direction at the tail end of the ith branch in the power distribution network, and UiIs the actual voltage value, P, of the ith node in the distribution networki-1、Qi-1Respectively the active power and the reactive power which flow out from the i-1 th node along the tide direction at the tail end of the i-1 th branch in the power distribution network, and the Ui-1Is the actual voltage value, R, of the i-1 th node in the power distribution networki+jXiIs the equivalent impedance value, P, of the ith branch in the power distribution networkV,i、QV,iRespectively connecting the active output value and the reactive output value P of the photovoltaic power supply of the ith node in the power distribution networkL,i、QL,iRespectively the active power and the reactive power of the ith node load in the power distribution network; i belongs to [0, N ]]；
Step 1.1, obtaining an actual voltage value U of the ith node of the photovoltaic power supply accessed to the power distribution networkiSo as to obtain a set of voltage actual values U ═ U0,U1,...,Ui,...,UN}；
Step 1.2, obtaining the active power P of the ith node by using the formula (1) and the formula (2)iReactive power QiSo as to obtain the active power set P ═ { P ═ P0,P1,...,Pi,...,PNQ, a reactive power set Q ═ Q0,Q1,...,Qi,...,QN}；
Figure GDA0003031525840000021
Figure GDA0003031525840000022
Step 2, calculating an active loss index of the ith branch of the photovoltaic power supply accessed to the power distribution network;
step 2.1, calculating active power loss delta P of the ith branch of the photovoltaic power supply connected to the power distribution network by using the formula (3)i：
Figure GDA0003031525840000023
Step 2.2, calculating the ith strip of the photovoltaic power supply connected to the power distribution network by using the formula (4)Active loss index of branch
Figure GDA0003031525840000026
Figure GDA0003031525840000024
Step 3, calculating a voltage deviation index of the ith node of the photovoltaic power supply connected to the power distribution network;
calculating voltage deviation index theta of ith node of photovoltaic power supply connected to power distribution network by using formula (5)i：
Figure GDA0003031525840000025
In the formula (5), Ui,CThe nominal voltage of the ith node of the power distribution network;
step 4, establishing a target function considering the economy, reliability and photovoltaic absorption capacity of the power distribution network;
step 4.1, introducing an output factor delta of a photovoltaic power supply of the ith node grid connection of the power distribution networki；
Step 4.2, establishing an objective function for optimizing the safety and the economy of the power distribution network accessed by the photovoltaic power supply by using the formula (6):
Figure GDA0003031525840000031
step 5, determining constraint conditions of the operation of the power system under the background of the photovoltaic power supply access distribution network;
step 5.1, determining the fluctuation allowable range of the node voltage of the power distribution network by using the formula (7):
0.95Ui,C≤Ui≤1.05Ui,C i＝0,1,...,N (7)
in the formula (7), 1.05Ui,C、0.95Ui,CRespectively representing the upper limit value and the lower limit value of the ith node voltage of the power distribution network;
and 5.2, determining the active power flow constraint of the power distribution network node by using the formula (8):
0≤Pi≤Pi,max i＝0,1,...,N (8)
in the formula (8), Pi,maxTransmitting a power limit for the ith branch in the power distribution network;
and 5.3, determining the active output constraint of the thermal power generating unit by using the formula (9) and the formula (10):
Pg,i,min≤Pg,i≤Pg,i,max i＝0,1,...,N (9)
-vΔt≤ΔPg,i≤vΔt i＝0,1,...,N (10)
in formulae (9) and (10), Pg,iActive power P of thermal power generating unit accessed to ith node in power distribution networkg,i,max、Pg,i,minThe active power upper limit value and the active power lower limit value, delta P, of the thermal power generating unit accessed by the ith node in the power distribution networkg,iThe active power change value of the thermal power generating unit accessed to the ith node in the power distribution network in a regulation and control period is v, the active power regulation rate of the thermal power generating unit in the power distribution network is v, and delta t is the duration of the regulation and control period;
and 5.4, determining the active power output constraint of the photovoltaic power supply by using the formula (11) and the formula (12):
0≤PV,i≤PV,i,max i＝0,1,...,N (11)
PV,i+Pg,i,min≤0.95Si+PL,i i＝0,1,...,N (12)
in formulae (11) and (12), PV,i,maxMaximum active output value S of photovoltaic power supply for grid connection of ith node of power distribution networkiThe master transformer capacity of the ith node of the power distribution network is accessed to the photovoltaic power supply;
step 5.5, determining the consumption space of the photovoltaic power supply by using the formula (13) and the formula (14):
Figure GDA0003031525840000032
Figure GDA0003031525840000033
in formulae (13) and (14), PV,CIs a photovoltaic output space numerical value which is issued to the power distribution network by a dispatching mechanism,
Figure GDA0003031525840000041
the sum of the active power output of the photovoltaic power supply which is connected with the grid by all the nodes of the power distribution network,
Figure GDA0003031525840000042
the sum of the lower active limit values of the thermal power generating units accessed to all the nodes of the power distribution network,
Figure GDA0003031525840000043
the active power sum of all node loads of the power distribution network is obtained;
and 5.6, determining power balance constraint of the operation of the power distribution network by using the formula (15):
Figure GDA0003031525840000044
in the formula (15), PATransmitting an active power value for the lower level main network connected with the power distribution network;
and 6, solving a photovoltaic power supply active power regulation and control model which is formed by the objective function and each constraint condition and takes the power distribution network economic safety optimization into account through a linear programming algorithm to obtain an active power value of the photovoltaic power supply under the power distribution network economic optimization, safety optimization and photovoltaic absorption promotion targets, and taking the active power optimization value as a power output regulation and control target of the power distribution network photovoltaic power supply to realize the regulation and control of the active power of the power distribution network photovoltaic power supply.
Compared with the prior art, the invention has the beneficial effects that:
1. the target function established by the invention comprehensively considers the branch active loss index, the node voltage deviation index and the photovoltaic power output factor of the power distribution network, and compared with a conventional photovoltaic power output model, the model can realize the comprehensive effects of maximizing the photovoltaic power output, stabilizing the node voltage of the power distribution network and minimizing the branch loss.
2. According to the photovoltaic power supply power distribution network power distribution system, the output factor of the photovoltaic power supply is introduced, the output factor is measured according to the peak load of the power distribution network nodes, the output factor is higher when the peak load is larger, and therefore the photovoltaic power supply of the node can be controlled to obtain a larger power regulation value, the photovoltaic power supply of each node of the power distribution network can utilize the photovoltaic receiving space more accurately, the grid-connected photovoltaic output and load supply-demand relation of each node is fully considered, and transmission loss of a.
3. According to the constraint conditions of the power system, the main transformer capacity limitation conditions of the nodes of the power distribution network are calculated, the output of the photovoltaic power supply of all the nodes of the power distribution network can be accurately constrained, the utilization condition of the main transformer capacity of the nodes of the power distribution network is fully considered, and the utilization efficiency of the main transformer of each node of the power distribution network and the output level of the photovoltaic power supply are improved.
4. According to the method, the power balance constraint of the power distribution network is accurately optimized, the photovoltaic consumption space limit issued by a scheduling mechanism to the power distribution network is considered, and under the condition that the output of a thermal power unit of the power distribution network is lowest, the consumption space of the photovoltaic power supply is accurately calculated, so that the output of the photovoltaic power supply solved in an optimization model is maximized, and the consumption capacity of the photovoltaic power supply is effectively improved.
Drawings
FIG. 1a is an equivalent system diagram of the photovoltaic power source of the present invention connected to a distribution network;
FIG. 1b is an equivalent model of the photovoltaic power supply accessing the ith branch of the distribution network according to the present invention;
FIG. 2 is a flow chart of photovoltaic power regulation according to the method of the present invention.
Detailed Description
In the embodiment, after comprehensive analysis and improvement are performed for improvement of the photovoltaic power consumption level and operation guarantee of safety and stability of an electric power system in the power distribution network background, a photovoltaic power active power regulation and control method considering optimization of economic safety of the power distribution network is provided, different nodes of the power distribution network are connected to a photovoltaic power supply, a thermal power generating unit and a load, and fig. 1a is an equivalent system diagram of the photovoltaic power supply connected to the power distribution network; as shown in fig. 2, the power regulation method is performed as follows:
step 1, acquiring a voltage actual value of a power distribution network node, and calculating active power and reactive power of the power distribution network node;
the number of branches of the power distribution network is N, and the number of nodes is N +1 (the method does not consider the condition of a power distribution network ring network), wherein the public connection point of the power distribution network and a superior power grid is marked as a 0 th node, and the tail end node of the ith branch is an ith node; FIG. 1b is an equivalent model of the ith branch of the photovoltaic power source connected to the distribution network, Pi、QiRespectively is the active power, the reactive power and the U flowing out from the i node along the tide direction at the tail end of the ith branch of the power distribution networkiIs the actual voltage value, P, of the ith node of the distribution networki-1、Qi-1Respectively the active power and the reactive power which flow out from the i-1 node along the tide direction at the tail end of the i-1 branch of the power distribution network, and the Ui-1Is the actual voltage value, R, of the i-1 th node of the power distribution networki+jXiIs the equivalent impedance value, P, of the ith branch of the distribution networkV,i、QV,iThe active output value and the reactive output value P of the photovoltaic power supply which are respectively connected with the power distribution network ith node in a grid modeL,i、QL,iRespectively the active power and the reactive power of the load of the ith node of the power distribution network; i belongs to [0, N ]]；
Step 1.1, obtaining an actual voltage value U of the ith node of the photovoltaic power supply accessed to the power distribution networkiSet of voltage actual values U ═ U0,U1,...,Ui,...,UN}；
Step 1.2, obtaining the active power P of the ith node by using the formula (1) and the formula (2)iReactive power QiSo as to obtain the active power set P ═ { P ═ P0,P1,...,Pi,...,PNQ, a reactive power set Q ═ Q0,Q1,...,Qi,...,QN}；
Figure GDA0003031525840000051
Figure GDA0003031525840000052
Step 2, calculating an active loss index of the ith branch of the photovoltaic power supply accessed to the power distribution network;
step 2.1, calculating active power loss delta P of the ith branch of the photovoltaic power supply connected to the power distribution network by using the formula (3)i：
Figure GDA0003031525840000053
Step 2.2, calculating the active loss index of the ith branch of the photovoltaic power supply connected to the power distribution network by using the formula (4)
Figure GDA0003031525840000061
Figure GDA0003031525840000062
Step 3, calculating a voltage deviation index of the ith node of the photovoltaic power supply connected to the power distribution network;
calculating voltage deviation index theta of ith node of photovoltaic power supply connected to power distribution network by using formula (5)i：
Figure GDA0003031525840000063
In the formula (5), Ui,CThe nominal voltage of the ith node of the power distribution network;
step 4, establishing a target function considering the economy, reliability and photovoltaic absorption capacity of the power distribution network;
step 4.1, introducing an output factor delta of a photovoltaic power supply of the ith node grid connection of the power distribution networkiIf the peak load of the ith node is larger, the output factor of the photovoltaic power supply of the ith node is larger;
step 4.2, taking branch active power loss index, node voltage deviation index and photovoltaic power output factor into consideration, and establishing a power distribution network safety and economic optimization objective function accessed by the photovoltaic power by taking photovoltaic power output maximization, power distribution network node voltage stabilization and branch loss minimization as optimization objectives:
Figure GDA0003031525840000064
the formula (6) shows that the output of the photovoltaic power supply of each node is controlled to enable the power distribution network to reach the power distribution network running state with the maximum photovoltaic power supply output, the stable node voltage and the minimum branch loss;
step 5, determining constraint conditions of the operation of the power system under the background of the photovoltaic power supply access distribution network;
step 5.1, determining the fluctuation allowable range of the node voltage of the power distribution network by using the formula (7):
0.95Ui,C≤Ui≤1.05Ui,C i＝0,1,...,N (7)
in the formula (7), 1.05Ui,C、0.95Ui,CRespectively representing the upper limit value and the lower limit value of the ith node voltage of the power distribution network;
and 5.2, determining the active power flow constraint of the power distribution network node by using the formula (8):
0≤Pi≤Pi,max i＝0,1,...,N (8)
in the formula (8), Pi,maxTransmitting a power limit for the ith branch in the power distribution network;
and 5.3, determining the active output constraint of the thermal power generating unit by using the formula (9) and the formula (10):
Pg,i,min≤Pg,i≤Pg,i,max i＝0,1,...,N (9)
-vΔt≤ΔPg,i≤vΔt i＝0,1,...,N (10)
in formulae (9) and (10), Pg,iActive power P of thermal power generating unit accessed to ith node in power distribution networkg,i,max、Pg,i,minThermal power engine respectively connected to ith node in power distribution networkUpper and lower limits of group active power, Δ Pg,iThe active power change value of the thermal power generating unit accessed to the ith node in the power distribution network in a regulation and control period is v, the active power regulation rate of the thermal power generating unit in the power distribution network is v, and delta t is the duration of the regulation and control period;
and 5.4, determining the active power output constraint of the photovoltaic power supply by using the formula (11) and the formula (12):
0≤PV,i≤PV,i,max i＝0,1,...,N (11)
PV,i+Pg,i,min≤0.95Si+PL,i i＝0,1,...,N (12)
in formulae (11) and (12), PV,i,maxMaximum active output value S of photovoltaic power supply for grid connection of ith node of power distribution networkiThe master transformer capacity of the ith node of the power distribution network is accessed to the photovoltaic power supply;
step 5.5, determining the consumption space of the photovoltaic power supply by using the formula (13) and the formula (14):
Figure GDA0003031525840000071
Figure GDA0003031525840000072
in formulae (13) and (14), PV,CIs a photovoltaic output space numerical value which is issued to the power distribution network by a dispatching mechanism,
Figure GDA0003031525840000073
the sum of the active power output of the photovoltaic power supply which is connected with the grid by all the nodes of the power distribution network,
Figure GDA0003031525840000074
the sum of the lower active limit values of the thermal power generating units accessed to all the nodes of the power distribution network,
Figure GDA0003031525840000075
the active power sum of all node loads of the power distribution network is obtained;
and 5.6, determining power balance constraint of the operation of the power distribution network by using the formula (15):
Figure GDA0003031525840000076
in the formula (15), PATransmitting an active power value for the lower level main network connected with the power distribution network;
and 6, solving the photovoltaic power supply active power regulation and control model for calculating the economic safety optimization of the power distribution network through a linear programming algorithm, further solving the active power value of the photovoltaic power supply under the economic optimization, safety optimization and photovoltaic consumption promotion targets of the power distribution network, and taking the active power optimization value as the output regulation and control target of the photovoltaic power supply of the power distribution network so as to realize the regulation and control of the active power of the photovoltaic power supply of the power distribution network and further realize the promotion of the economic efficiency, safety and photovoltaic consumption level of the optimized power distribution network.

Claims (1)

1. The photovoltaic power supply active power regulation and control method considering the optimization of the economic safety of the power distribution network is characterized in that different nodes of the power distribution network are connected with a photovoltaic power supply, a thermal power generating unit and a load, and the photovoltaic power supply active power regulation and control method is carried out according to the following steps:
step 1, acquiring a voltage actual value of a power distribution network node, and calculating active power and reactive power of the power distribution network node;
the number of branches of the power distribution network is assumed to be N, the number of nodes is N +1, wherein the public connection point of the power distribution network and a superior power grid is marked as a 0 th node, and the tail end node of the ith branch is an ith node; pi、QiRespectively the active power and the reactive power which flow out from the ith node along the tide direction at the tail end of the ith branch in the power distribution network, and UiIs the actual voltage value, P, of the ith node in the distribution networki-1、Qi-1Respectively the active power and the reactive power which flow out from the i-1 th node along the tide direction at the tail end of the i-1 th branch in the power distribution network, and the Ui-1Is the actual voltage value, R, of the i-1 th node in the power distribution networki+jXiIs a stand forEquivalent impedance value, P, of the ith branch in the distribution networkV,i、QV,iRespectively connecting the active output value and the reactive output value P of the photovoltaic power supply of the ith node in the power distribution networkL,i、QL,iRespectively the active power and the reactive power of the ith node load in the power distribution network; i belongs to [0, N ]]；
Step 1.1, obtaining an actual voltage value U of the ith node of the photovoltaic power supply accessed to the power distribution networkiSo as to obtain a set of voltage actual values U ═ U0,U1,...,Ui,...,UN}；
Step 1.2, obtaining the active power P of the ith node by using the formula (1) and the formula (2)iReactive power QiSo as to obtain the active power set P ═ { P ═ P0,P1,...,Pi,...,PNQ, a reactive power set Q ═ Q0,Q1,...,Qi,...,QN}；
Figure FDA0003031525830000011
Figure FDA0003031525830000012
Step 2, calculating an active loss index of the ith branch of the photovoltaic power supply accessed to the power distribution network;
step 2.1, calculating active power loss delta P of the ith branch of the photovoltaic power supply connected to the power distribution network by using the formula (3)i：
Figure FDA0003031525830000013
Step 2.2, calculating the active loss index of the ith branch of the photovoltaic power supply connected to the power distribution network by using the formula (4)
Figure FDA0003031525830000014
Figure FDA0003031525830000015
Step 3, calculating a voltage deviation index of the ith node of the photovoltaic power supply connected to the power distribution network;
calculating voltage deviation index theta of ith node of photovoltaic power supply connected to power distribution network by using formula (5)i：
Figure FDA0003031525830000021
In the formula (5), Ui,CThe nominal voltage of the ith node of the power distribution network;
step 4, establishing a target function considering the economy, reliability and photovoltaic absorption capacity of the power distribution network;
step 4.1, introducing an output factor delta of a photovoltaic power supply of the ith node grid connection of the power distribution networki；
Step 4.2, establishing an objective function for optimizing the safety and the economy of the power distribution network accessed by the photovoltaic power supply by using the formula (6):
Figure FDA0003031525830000022
step 5, determining constraint conditions of the operation of the power system under the background of the photovoltaic power supply access distribution network;
step 5.1, determining the fluctuation allowable range of the node voltage of the power distribution network by using the formula (7):
0.95Ui,C≤Ui≤1.05Ui,C i＝0,1,...,N (7)
in the formula (7), 1.05Ui,C、0.95Ui,CRespectively representing the upper limit value and the lower limit value of the ith node voltage of the power distribution network;
and 5.2, determining the active power flow constraint of the power distribution network node by using the formula (8):
0≤Pi≤Pi,max i＝0,1,...,N (8)
in the formula (8), Pi,maxTransmitting a power limit for the ith branch in the power distribution network;
and 5.3, determining the active output constraint of the thermal power generating unit by using the formula (9) and the formula (10):
Pg,i,min≤Pg,i≤Pg,i,max i＝0,1,...,N (9)
-vΔt≤ΔPg,i≤vΔt i＝0,1,...,N (10)
in formulae (9) and (10), Pg,iActive power P of thermal power generating unit accessed to ith node in power distribution networkg,i,max、Pg,i,minThe active power upper limit value and the active power lower limit value, delta P, of the thermal power generating unit accessed by the ith node in the power distribution networkg,iThe active power change value of the thermal power generating unit accessed to the ith node in the power distribution network in a regulation and control period is v, the active power regulation rate of the thermal power generating unit in the power distribution network is v, and delta t is the duration of the regulation and control period;
and 5.4, determining the active power output constraint of the photovoltaic power supply by using the formula (11) and the formula (12):
0≤PV,i≤PV,i,max i＝0,1,...,N (11)
PV,i+Pg,i,min≤0.95Si+PL,i i＝0,1,...,N (12)
in formulae (11) and (12), PV,i,maxMaximum active output value S of photovoltaic power supply for grid connection of ith node of power distribution networkiThe master transformer capacity of the ith node of the power distribution network is accessed to the photovoltaic power supply;
step 5.5, determining the consumption space of the photovoltaic power supply by using the formula (13) and the formula (14):
Figure FDA0003031525830000031
Figure FDA0003031525830000032
in formulae (13) and (14), PV,CIssued to the distribution network for the dispatching authoritiesThe space value of the photovoltaic output is calculated,
Figure FDA0003031525830000033
the sum of the active power output of the photovoltaic power supply which is connected with the grid by all the nodes of the power distribution network,
Figure FDA0003031525830000034
the sum of the lower active limit values of the thermal power generating units accessed to all the nodes of the power distribution network,
Figure FDA0003031525830000035
the active power sum of all node loads of the power distribution network is obtained;
and 5.6, determining power balance constraint of the operation of the power distribution network by using the formula (15):
Figure FDA0003031525830000036
in the formula (15), PATransmitting an active power value for the lower level main network connected with the power distribution network;
and 6, solving a photovoltaic power supply active power regulation and control model which is formed by the objective function and each constraint condition and takes the power distribution network economic safety optimization into account through a linear programming algorithm to obtain an active power value of the photovoltaic power supply under the power distribution network economic optimization, safety optimization and photovoltaic absorption promotion targets, and taking the active power optimization value as a power output regulation and control target of the power distribution network photovoltaic power supply to realize the regulation and control of the active power of the power distribution network photovoltaic power supply.
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