CN110601211B - Method for adjusting distribution network voltage and improving distributed power consumption based on SVC - Google Patents

Method for adjusting distribution network voltage and improving distributed power consumption based on SVC Download PDF

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CN110601211B
CN110601211B CN201910896714.8A CN201910896714A CN110601211B CN 110601211 B CN110601211 B CN 110601211B CN 201910896714 A CN201910896714 A CN 201910896714A CN 110601211 B CN110601211 B CN 110601211B
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distribution network
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CN110601211A (en
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夏岩峰
鹿丽
晏云桥
郝睿
鹿军
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Anshan Power Supply Co Of State Grid Liaoning Electric Power Co
State Grid Corp of China SGCC
State Grid Liaoning Electric Power Co Ltd
Northeast Electric Power University
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Anshan Power Supply Co Of State Grid Liaoning Electric Power Co
State Grid Corp of China SGCC
Northeast Dianli University
State Grid Liaoning 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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Abstract

A method for improving distributed power consumption by regulating distribution network voltage based on SVC belongs to the technical field of distributed power consumption. The SVC-based method for adjusting the voltage of the distribution network and improving the consumption of the distributed power supply is economical, efficient, good in adaptability and high in practical value. The invention establishes a model containing constant impedance load and a wind-powered distributed power supply, establishes an SVC control and adjustment strategy based on a voltage-active sensitivity theory, and obtains the following main conclusions: the constant impedance load can better absorb abandoned wind and optical power when running under the SVC control strategy, thereby achieving the purpose of improving the absorption of the distributed power supply; meanwhile, the SVC compensation capacity is adjusted, so that the voltage distribution of the distribution network can be improved, and the network loss can be reduced.

Description

Method for adjusting distribution network voltage and improving distributed power consumption based on SVC
Technical Field
The invention belongs to the technical field of distributed power consumption, and particularly relates to a method for improving distributed power consumption by regulating distribution network voltage based on a Static Var Compensator (SVC).
Background
With the increasing proportion of new renewable energy resources in the global energy structure and the large-scale development of grid connection of distributed power supplies, the problem of the bottleneck of power grid consumption caused by the phenomenon of wind and light abandonment becomes an urgent problem, and how to improve the consumption of the distributed power supplies under the standard requirements of low cost and high efficiency becomes an urgent problem. Distribution network voltage regulation is one of effective means for improving the distributed power supply consumption, and the analysis and research of the influence of the distribution network voltage regulation on the distributed power supply consumption are of great significance.
At present, the research on improving the consumption of the distributed power supply in the power distribution network is carried out by staying to optimize the maximum capacity of the distributed power supply access and the site selection capacity, but the situation that whether the high-capacity distributed power supply can be accessed to improve the energy consumption is unknown is still not known. No relevant methods have been developed to improve distributed power consumption from the point of view of regulating the voltage of a distribution network.
Therefore, there is a need in the art for a new solution to solve this problem.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for adjusting the voltage of the distribution network and improving the distributed power consumption based on the SVC is provided for solving the technical problem that a related method for researching and improving the distributed power consumption from the perspective of adjusting the voltage of the distribution network does not exist at present.
The method for regulating the voltage of the distribution network and improving the consumption of the distributed power supply based on the SVC comprises the following steps in sequence:
step one, establishing a distributed power supply model
Establishing a wind power generation model to obtain the output power P of the wind driven generator w A formula;
establishing a photovoltaic power generation model to obtain the output power P of the photovoltaic cell SPP A formula;
step two, establishing a constant impedance load model to obtain the active power of a constant impedance load node in the distribution network;
step three, SVC reactive compensation voltage regulation is carried out under the DG consumption state of the distributed power supply according to the distributed power supply model established in the step one and the constant impedance load model established in the step two
Obtaining the voltage of a node after the SVC is connected according to the compensation susceptance of the SVC and the reactive compensation quantity of the SVC;
step four, expressing the relation between the node active power and the distribution network node voltage through the node active-voltage sensitivity, and combining a node voltage formula after SVC compensation and an active power formula of a constant impedance load node to obtain the constant impedance load node voltage-active sensitivity;
and fifthly, installing an SVC device in the power grid, keeping the injection power of the power grid within a set range value, adjusting the voltage of the distribution network by adjusting the alpha value of the SVC, so that the capacity of the constant impedance load for absorbing active power is improved, and calculating and obtaining the distributed power absorption capacity through a distributed power absorption rate formula.
The output power P of the wind driven generator in the first step w The formula is as follows:
Figure GDA0003815617660000021
wherein: p rw Rated output power for the wind driven generator; v is the wind speed; v. of r Rated power wind speed of the wind driven generator; v. of in Starting wind for wind power generatorSpeed; v. of out And stopping the wind speed for the wind driven generator.
In the first step, the output power P of the photovoltaic cell SPP The formula is as follows:
Figure GDA0003815617660000022
wherein: p SPP Outputting power for the photovoltaic cell; r STD Is standard solar radiation, and R is actual illumination radiation; r is C Is a certain radiation spot, P rs Is the rated power of the photovoltaic cell.
The active power formula of the constant impedance load node in the second step is as follows:
Figure GDA0003815617660000023
wherein: p is i Is the constant impedance active power at node i; u shape i Is the voltage at node i; y is the constant impedance load admittance.
Compensation susceptance B of SVC in the third step SVC The formula is as follows:
Figure GDA0003815617660000031
wherein: b is TCR Controlling the susceptance value of the reactor for the TCR thyristor; b is C Is the susceptance value of the capacitor C; x L Controlling the reactance value of the reactor for the TCR thyristor; x C Is the reactance value of the capacitor; and alpha is an SVC trigger angle.
The reactive compensation quantity Q of the SVC in the third step SVC The formula is as follows:
Figure GDA0003815617660000032
wherein: b is SVC Compensation susceptance for SVC; u shape m The voltage of node m is accessed for SVC.
After the SVC is connected in step three, the voltage formula of the node k is as follows:
Figure GDA0003815617660000033
wherein: u shape k The voltage of a node k before SVC access; q SVC Is the reactive compensation quantity of SVC; x i Is the reactance at node i; u shape i Is the voltage at node i.
The voltage-active sensitivity formula of the constant impedance load node in the fourth step is as follows:
Figure GDA0003815617660000034
wherein: delta P i Is the constant impedance active power variation at node i; delta U i Is the voltage variation at node i; u shape i Is the voltage at node i; y is the constant impedance load admittance.
The formula of the consumption rate of the distributed power supply in the fifth step is as follows:
Figure GDA0003815617660000041
wherein: s DG Is the DG consumption rate; p DG,t Active power sent for DG at time t; p k,t The load active power of a node k at the moment t; p is s.t Active power is injected into the distribution network at the moment t; t is the total time period number; and N is the number of nodes.
Through the design scheme, the invention can bring the following beneficial effects:
the SVC-based method for adjusting the voltage of the distribution network and improving the consumption of the distributed power supply is economical, efficient, good in adaptability and high in practical value. The invention establishes a model containing constant impedance load and a wind light distributed power supply, establishes an SVC control and adjustment strategy based on a voltage-active sensitivity theory, and obtains the following main conclusions: the constant impedance load can better consume abandoned wind and optical power when running under an SVC control strategy, and the aim of improving the consumption of the distributed power supply is fulfilled; meanwhile, the SVC compensation capacity is adjusted, so that the voltage distribution of the distribution network can be improved, and the network loss can be reduced.
With the development of renewable energy power generation technology, it is very meaningful to put a constant impedance load in a proper proportion into a power distribution network and to formulate a proper SVC voltage regulation strategy to improve the energy consumption level. By using the method provided by the invention, the consumption of the distributed power supply in the power distribution network can be improved, and the effectiveness of the method is fully reflected.
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The invention is further described with reference to the following figures and detailed description:
fig. 1 is a network topology diagram of an embodiment of a method for adjusting distribution network voltage and increasing distributed power consumption based on SVC in the present invention.
Fig. 2 is a schematic diagram illustrating the adjustment of the SVC trigger angle voltage variation in the method for adjusting the distribution network voltage and increasing the distributed power consumption based on the SVC.
Fig. 3 is a schematic diagram of adjusting the SVC constant impedance load power change in the method for adjusting the distribution network voltage and increasing the distributed power consumption based on the SVC.
Fig. 4 is a schematic diagram illustrating the adjustment of SVC consumption change in the method for adjusting the distribution network voltage and increasing the distributed power consumption based on SVC of the present invention.
Detailed Description
The method for regulating the voltage of the distribution network to improve the consumption of the distributed power supply based on the SVC comprises the following steps which are sequentially carried out,
step one, establishing a distributed power supply model
Because wind energy and light energy are greatly influenced by natural environment, the output of wind power and photovoltaic distributed power supply has the characteristics of instability, time sequence and intermittent characteristics, and the following influences can be brought to a power distribution network after the power distribution network is connected: 1) During the load valley period or the period when the output of the distributed power supply is too large, the phenomena of 'wind abandoning' and 'light abandoning' may occur, and further the consumption of the distributed power supply of the power distribution network is influenced. 2) The output of the distributed power supply changes along with time, and fluctuation is brought to the power distribution network. 3) The distributed power access to the end of the distribution line may increase the risk of overvoltage.
Here, the distributed power source is exemplified by wind power generation and photovoltaic power generation.
1. Establishing a fan power generation model
The wind power generation power has random fluctuation characteristics and is determined by wind speed and fan parameters, and the wind speed is closely related to the geographical environment of the fan installation site. Output power P of an actual fan w As shown in formula (1):
Figure GDA0003815617660000051
wherein: p rw Rated output power for the fan; v is the wind speed; v. of r Rated power wind speed for the wind turbine; v. of in Starting wind speed for the wind turbine; v. of out Wind speed is stopped for the wind turbine.
2. Establishing a photovoltaic power generation model
Photovoltaic cell output power P SPP As shown in formula (2):
Figure GDA0003815617660000052
wherein: p is SPP Outputting power for the photovoltaic cell; r STD Is standard solar radiation (typically 1000W/m) 2 ) (ii) a R is actual illumination radiation; r C Is a certain radiation point (usually 150W/m) 2 )；P rs Is the rated power of the photovoltaic cell.
Step two, establishing a constant impedance load model
Load response in the power distribution network has the characteristics of uncertainty and time sequence characteristics, more DG power of the distributed power supply can be absorbed in the load peak period, the DG power absorbed in the load valley period is reduced, and the load response in different degrees can influence the absorption of the DG in the power distribution network. The load characteristics can be classified into a constant power load, a constant impedance load, and a dynamic load. Where the dynamic load is related to the user demand.
Characteristic of constant power load the load absorbs a constant amount of power. In the load flow calculation, the type of load node belongs to a PQ node, equivalent load power and equivalent power supply power are given, equivalent injected power is given, and the quantity to be required is the node voltage size and the phase angle.
A constant impedance loading model is used in the present invention.
The impedance of the constant impedance load is determined and can be calculated by the rated apparent power and rated voltage of the load, and the constant impedance is calculated according to the following formula:
Figure GDA0003815617660000061
wherein: u shape N Rated voltage for constant impedance load; s N Rated power which is rated voltage of the constant impedance load; u shape B Is a voltage reference value; s B Is a power reference value;
Figure GDA0003815617660000063
is the per unit value of the rated active power of the constant impedance load;
Figure GDA0003815617660000064
is the per unit value of the rated reactive power of the constant impedance load; y is * Is the per unit value of the constant impedance load admittance.
The constant-impedance load absorbed power is related to the voltage of a load node, and is shown in formula (4):
Figure GDA0003815617660000062
wherein: s. the * Absorbing power for a constant impedance load; p is the active power of the constant impedance load; q is the reactive power of the constant impedance load; u is the voltage of the constant impedance load node; z * Is a per unit value of impedance; y is * Is the per unit value of the constant impedance load admittance.
The constant impedance load R > > X (where R is a resistor and X is a reactance), the reactive magnitude of the constant impedance load is negligible, and the active power of the constant impedance load access node i is as shown in formula (5):
Figure GDA0003815617660000071
wherein: p i Is the constant impedance active power at node i; u shape i Is the voltage at node i; y is the constant impedance load admittance.
As can be seen from equation (5), the magnitude of the active power absorbed by the constant-impedance load is proportional to the square of the magnitude of the voltage at the constant-impedance load; the larger the voltage there is, the more power is absorbed by the constant impedance. The formula (1) shows that the main reason for restricting the DG consumption is that the power regulation range of the power distribution network is limited, so that the constant impedance load can absorb more power by regulating the voltage of the constant impedance load within the voltage constraint condition, the power regulation range of the power distribution network is enlarged, and the purpose of improving the DG consumption is achieved.
Step three, considering DG (distributed generation) consumption of distributed power supply to set SVC (static var compensator) reactive compensation voltage regulation strategy
Due to the fluctuation and randomness of the output force, the arrangement of a DG in a large capacity in a power distribution network cannot guarantee that the energy consumption level is high. SVC is the most commonly used voltage regulating device based on reactive compensation at present, can compensate and adjust continuously and smoothly fast, and the reliability is high, and active loss is little. The power absorbed by the constant impedance load is strongly related to the voltage at the load; the switching in and out of interruptible loads also affects the voltage at the switch. On the basis, a SVC-based voltage regulation strategy is provided, and the operation cost and the network loss are minimum while the DG consumption is improved.
(1) Influence of SVC on distribution network voltage
Compensation susceptance B of SVC SVC As shown in formula (6):
Figure GDA0003815617660000072
wherein: b TCR Controlling the susceptance value of the reactor for the TCR thyristor; b is C Is the susceptance value of the capacitor C; x L Controlling the reactance value of the reactor for the TCR thyristor; x C Is the reactance value of the capacitor; and alpha is an SVC trigger angle.
Reactive compensation quantity Q of SVC SVC As shown in formula (7):
Figure GDA0003815617660000073
wherein: b is SVC Compensation susceptance for SVC; u shape m The voltage of node m is accessed for SVC.
After the SVC is connected, the voltage of the node i is as shown in formula (8):
Figure GDA0003815617660000081
wherein: u shape i Accessing the voltage of the previous node i for the SVC; q SVC Is the reactive compensation quantity of SVC; x k Is the reactance at node k; u shape k Is the voltage at node k.
According to the formula (8), the node voltage is related to the alpha angle of the SVC, the SVC can raise the distribution network voltage after being connected into the distribution network, the distribution network voltage can be raised to different degrees by adjusting the alpha angle of the SVC, and the larger the alpha value is, the larger the voltage value is.
Step four, expressing the relation between the node active power and the distribution network node voltage through the active-voltage sensitivity of the node, and combining the compensation susceptance formula of the SVC to obtain the constant impedance load node voltage-active sensitivity
(1) The effect of voltage regulation on the distributed power supply can be expressed in terms of voltage regulation on active sensitivity
In the stable operation of the distribution network, the voltage can be adjusted in a standard range to change the consumption of the distributed power supply on the premise of keeping the power of the balance node basically unchanged. The influence of voltage regulation on the distributed power supply can be expressed by the active sensitivity of voltage regulation, namely that the active power change of each node is caused by the voltage change of each node, and can be expressed by the following formula.
f(U i ,P i )＝0 (9)
Wherein: u shape i Is the voltage at node i, P i Is the active power at node i.
When the voltage of the node i changes to delta U i When the active variation is delta P i . Definition K i ＝ΔU i /ΔP i The active-voltage sensitivity of the node i is used for reflecting the relation between the node active power and the voltage of the distribution network node. The voltage-active sensitivity of the constant-impedance load node is deduced from the formula (5) and the formula (8):
Figure GDA0003815617660000082
wherein: delta P i The variable quantity of the constant impedance active power at the node i is obtained; delta U i Is the voltage variation at node i; u shape i Is the voltage at node i; y is the constant impedance load admittance.
Step five, calculating and obtaining the consumption capability of the distributed power supply through a distributed power supply consumption rate formula
The distributed power supply absorption is the ratio of the active power absorbed by the power distribution network and the active power sum of the distributed rated output of the power distribution network in a certain period, and the capability of the power distribution network for absorbing the distributed power supply is reflected. The distributed power supply absorption rate is shown as the formula (11):
Figure GDA0003815617660000091
wherein: s DG Is the DG consumption rate; p DG,t Active power generated for DG at time t; p is k,t The load active power of a node k at the moment t; p s.t Active power is injected into the distribution network at the moment t; t is the total time period number; and N is the number of nodes.
Under the condition of ensuring that the injection power of the main power grid is basically constant, the voltage of the distribution network is adjusted by installing an SVC device or adjusting the alpha value of the SVC, the capacity of constant impedance load for absorbing active power is improved, the power absorbed by the constant impedance load is derived from a wind and light distributed power supply, the situations of wind abandonment and light abandonment are reduced, and the purpose of improving the consumption of the distributed power supply is achieved.
The invention is further illustrated by the following figures and examples.
The embodiment is as follows:
taking an IEEE33 node power distribution network as an example, a distributed power supply takes photovoltaic power generation and wind power generation as an example, a reactive compensation device SVC is connected to 1 distributed photovoltaic power generation access node 5 of 1MW, 1 distributed wind power generation access node 2 of 1MW, 1 distributed wind power generation access node 20 of 0.6MW and 1 distributed wind power generation access node 33 of 0.5MW at nodes 18 and 33. Wherein the load at the node 12 is a dynamic load, the load at the node 33 is a constant impedance load, the system reference power is 10MVA, the reference voltage is 12.66kV, and the total load is 3720kW + j2300kvar. The network topology is shown in fig. 1.
Fig. 2 is a schematic diagram illustrating the voltage variation of the trigger angle of the SVC, and it can be seen from the diagram that when the SVC is not connected in the power distribution network, the voltage value of the terminal node of the line is very low and is at the critical position for safe voltage operation. After the SVC is connected into the power distribution network, the line voltage, particularly the node voltage of the SVC connection position, can be obviously improved, and the distribution network voltage can be adjusted to different degrees by adjusting the alpha value of the SVC. From the SVC access node 33, the value of α is adjusted separately and the node voltage is adjusted from 0.92 to 0.95. Fig. 3 is a schematic diagram for adjusting the change of the SVC constant impedance load power, and it can be known from the diagram that the constant impedance load node is closer to the wind power distributed power supply, the voltage fluctuation is greatly influenced by the output thereof, and the load node power is in direct proportion to the square of the voltage, so that the constant impedance load node voltage, the active power time curve waveform and the wind power distributed power supply output waveform are similar. By increasing the value alpha of the SVC, the voltage of the constant-impedance load node is increased in different degrees in the standard range, and the active power absorbed by the node is increased. The load power of the constant impedance node is increased along with the increase of the voltage, the more the distributed power supply power is absorbed from the distribution network, and the distributed power supply absorption is changed. Wherein K is Z The smaller the influence on the distributed power supply consumption, the larger the regulating of the voltage of the distribution network can influence the distributed power supply consumption. FIG. 4 is a schematic diagram of SVC digestion variation adjustment, and it can be seen from the diagram that switching SVC and adjusting the value of alpha can be performedThe absorption level of the distributed mode in each time interval is improved, and wind and light abandoning is reduced.
In conclusion, the distribution network voltage is adjusted within the standard range by adjusting the alpha value of the SVC, so that the load absorption power is changed, and the purpose of improving the consumption of the distributed power supply is achieved.

Claims (9)

1. A method for adjusting distribution network voltage and improving distributed power consumption based on SVC is characterized in that: comprises the following steps which are sequentially carried out,
step one, establishing a distributed power supply model
Establishing a wind power generation model to obtain the output power P of the wind driven generator w A formula;
establishing a photovoltaic power generation model to obtain the output power P of the photovoltaic cell SPP A formula;
step two, establishing a constant impedance load model to obtain the active power of a constant impedance load node in the distribution network;
step three, SVC reactive compensation voltage regulation is carried out under the DG consumption state of the distributed power supply according to the distributed power supply model established in the step one and the constant impedance load model established in the step two
Obtaining the voltage of a node after the SVC is connected according to the compensation susceptance of the SVC and the reactive compensation quantity of the SVC;
step four, expressing the relation between the node active power and the distribution network node voltage through the node active-voltage sensitivity, and combining a node voltage formula after SVC compensation and an active power formula of a constant impedance load node to obtain the constant impedance load node voltage-active sensitivity;
and fifthly, installing an SVC device in the power grid, keeping the injection power of the power grid within a set range value, adjusting the voltage of the distribution network by adjusting the alpha value of the SVC, so that the capacity of the constant impedance load for absorbing active power is improved, and calculating and obtaining the distributed power absorption capacity through a distributed power absorption rate formula.
2. The method for regulating distribution network voltage and increasing distributed power consumption based on the SVC of claim 1, wherein: in the step one, the wind power generatorOutput power P of the motor w The formula is as follows:
Figure FDA0003815617650000011
wherein: p rw Rated output power for the wind driven generator; v is the wind speed; v. of r Rated power wind speed of the wind driven generator; v. of in Starting wind speed for the wind driven generator; v. of out And stopping the wind speed for the wind driven generator.
3. The method for regulating distribution network voltage and improving distributed power consumption based on the SVC of claim 1, wherein: in the first step, the output power P of the photovoltaic cell SPP The formula is as follows:
Figure FDA0003815617650000021
wherein: p SPP Outputting power for the photovoltaic cell; r STD Is standard solar radiation, and R is actual illumination radiation; r C Is a certain radiation point, P rs Is the rated power of the photovoltaic cell.
4. The method for regulating distribution network voltage and improving distributed power consumption based on the SVC of claim 1, wherein: the active power formula of the constant impedance load node in the second step is as follows:
Figure FDA0003815617650000022
wherein: p is i Is the constant impedance active power at node i; u shape i Is the voltage at node i; y is the constant impedance load admittance.
5. The method of claim 1, wherein the method for regulating distribution network voltage to improve distributed power consumption based on SVC is characterized by: compensation susceptance B of SVC in the third step SVC The formula is as follows:
Figure FDA0003815617650000023
wherein: b is TCR Controlling the susceptance value of the reactor for the TCR thyristor; b is C Is the susceptance value of the capacitor C; x L Controlling the reactance value of the reactor for the TCR thyristor; x C Is the reactance value of the capacitor; and alpha is an SVC trigger angle.
6. The method for regulating distribution network voltage and increasing distributed power consumption based on the SVC of claim 1, wherein: the reactive compensation quantity Q of the SVC in the third step SVC The formula is as follows:
Figure FDA0003815617650000024
wherein: b is SVC Compensation susceptance for SVC; u shape m The voltage of node m is accessed for SVC.
7. The method for regulating distribution network voltage and increasing distributed power consumption based on the SVC of claim 1, wherein: after the SVC is connected in step three, the voltage formula of the node k is as follows:
Figure FDA0003815617650000031
wherein: u shape k Accessing the voltage of a previous node k for the SVC; q SVC Is the reactive compensation quantity of SVC; x i Is the reactance at node i; u shape i Is the voltage at node i.
8. The method for regulating distribution network voltage and increasing distributed power consumption based on the SVC of claim 1, wherein: the voltage-active sensitivity formula of the constant impedance load node in the fourth step is as follows:
Figure FDA0003815617650000032
wherein: delta P i The variable quantity of the constant impedance active power at the node i is obtained; delta U i Is the voltage variation at node i; u shape i Is the voltage at node i; y is the constant impedance load admittance.
9. The method for regulating distribution network voltage and improving distributed power consumption based on the SVC of claim 1, wherein: the formula of the consumption rate of the distributed power supply in the fifth step is as follows:
Figure FDA0003815617650000033
wherein: s DG Is the DG consumption rate; p is DG,t Active power generated for DG at time t; p k,t The load active power of a node k at the moment t; p s.t Active power is injected into the distribution network at the moment t; t is the total time period number; and N is the number of nodes.
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