CN-122000893-A - Bidirectional charging pile reactive power and voltage distributed cooperative control method and system based on consistency algorithm

CN122000893ACN 122000893 ACN122000893 ACN 122000893ACN-122000893-A

Abstract

The invention relates to the field of bidirectional charging pile control optimization, in particular to a bidirectional charging pile reactive power and voltage distributed cooperative control method and system based on a consistency algorithm, wherein the method comprises the steps of taking each bidirectional charging pile as a node, broadcasting the total reactive power shortage of the node to neighbor nodes and receiving the total reactive power shortage of the neighbor nodes; the method comprises the steps of obtaining reactive power correction quantity based on total reactive power deficiency of the node and neighbor nodes, adjusting virtual impedance by adopting the reactive power correction quantity, calculating estimation of the whole-network average voltage by each node under the virtual impedance by adopting an integral consistency algorithm to obtain a target value of the whole-network average voltage, obtaining voltage correction items of each node based on the target value, and correcting voltage reference values of each node by adopting the voltage correction items to obtain target voltage reference values of each node.

Inventors

YANG LIU
YU QIANG
ZHAO YU
ZHANG PENG
CHEN RAN
JIA QI
WANG MINGCAI
WANG WEN
YAN XUEYING
LI YANAN
LI PEIJUN
YANG YE
SU SHU

Assignees

国网上海市电力公司
国网智慧车联网技术有限公司
国家电网有限公司

Dates

Publication Date: 20260508
Application Date: 20251216

Claims (20)

1. The bidirectional charging pile reactive power and voltage distributed cooperative control method based on the consistency algorithm is characterized by comprising the following steps of: broadcasting the total reactive power shortage of the node to the neighbor nodes by taking each bidirectional charging pile as a node, and receiving the total reactive power shortage of the neighbor nodes; Acquiring reactive correction based on the total reactive deficiency of the node and the neighbor node, and adjusting virtual impedance by adopting the reactive correction; Iteratively calculating the estimation of the node to the whole network average voltage by adopting an integral consistency algorithm under the virtual impedance to obtain a target value of the whole network average voltage; And obtaining a voltage correction term of each node based on the target value, and correcting the voltage reference value of each node by adopting the voltage correction term to obtain the target voltage reference value of each node.
2. The bidirectional charging pile reactive and voltage distributed cooperative control method based on a consistency algorithm according to claim 1, wherein the total reactive deficiency includes a reactive deficiency and a reactive basic deficiency, wherein the reactive deficiency is related to a filter capacitance, a harmonic order, and an amplitude of a harmonic current of a corresponding node.
3. The bidirectional charging pile reactive power and voltage distributed cooperative control method based on the consistency algorithm as set forth in claim 2, wherein the calculation formula of the total reactive power deficiency is: Wherein, the Is the first The total reactive power shortage of the individual nodes, In the form of a reactive power base shortage, In the form of a reactive power shortage, the reactive power is, For the total number of harmonics, For the number of harmonics, Is the first The first node The amplitude of the subharmonic current is such that, For the angular frequency of the power grid, Is the first A filter capacitance of the individual nodes.
4. The bidirectional charging pile reactive power and voltage distributed cooperative control method based on the consistency algorithm according to claim 1, wherein the step of obtaining the reactive power correction amount based on the total reactive power deficiency of the present node and the neighboring node comprises the following steps: obtaining a consistency error based on the difference of the total reactive power deficiency of the node and the neighbor node; and calculating the consistency error by adopting PI control to obtain the reactive correction.
5. The bidirectional charging pile reactive power and voltage distributed cooperative control method based on the consistency algorithm as set forth in claim 4, wherein the calculation formula of the consistency error is: Wherein, the Is a node Is used to determine the consistency error of the (c) for the (c), In order for the gain to be uniform, As a weight of the capacity of the device, Is a node Is used for the total reactive power shortage of (1), Is a node Adjacent nodes Is not shown in the prior art).
6. The bidirectional charging pile reactive power and voltage distributed cooperative control method based on the consistency algorithm according to claim 5, wherein the calculation formula of the capacity weight is as follows: Wherein, the Is a node Is used to determine the rated apparent power capacity of the (c), Is a node Adjacent nodes Is used for the nominal apparent power capacity of the battery.
7. The bidirectional charging pile reactive power and voltage distributed cooperative control method based on the consistency algorithm as set forth in claim 1, wherein the calculation formula for adjusting the virtual impedance by using the reactive power correction amount is: Wherein, the In order to adapt the inductance to the current, In order to adapt the value of the resistance, Is a node The static inductance of the inductor is provided, Is a node The static resistance value at the point is set, The gain is modified for the inductance and, The gain is modified for the resistance and, Is a node Reactive correction amount at the position.
8. The bidirectional charging pile reactive power and voltage distributed cooperative control method based on the consistency algorithm according to claim 1 or 7, wherein the step of iteratively calculating the estimation of the total network average voltage by each node by adopting the integral consistency algorithm under the virtual impedance to obtain the target value of the total network average voltage comprises the following steps: obtaining virtual impedance-induced based on the virtual impedance Shaft and method for producing the same Voltage drop of the shaft; adopting the voltage drop to each node Shaft and method for producing the same Correcting the voltage component of the shaft to obtain the shaft sum of each node An accurate voltage component of the shaft; based on each node Shaft and method for producing the same And (3) the accurate voltage component of the shaft adopts an integral consistency algorithm to iteratively calculate the estimation of each node on the whole-network average voltage so as to obtain the target value of the whole-network average voltage.
9. The bidirectional charging pile reactive and voltage distributed cooperative control method based on the consistency algorithm according to claim 8, wherein the calculation formula of the axes of each node and the accurate voltage components of the axes is as follows: Wherein, the Is a virtual node At the position of The exact voltage component of the shaft, Is a virtual node At the position of The exact voltage component of the shaft, Output current for inverter The component on the axis of the shaft, Output current for inverter The component on the axis of the shaft, For the angular frequency of the power grid, Is a node A virtual resistance at the point where the voltage is applied, Is a node Virtual inductance at.
10. The bidirectional charging pile reactive and voltage distributed cooperative control method based on the consistency algorithm according to claim 8, wherein the integral consistency algorithm iteratively calculates an estimate of the average voltage of each node to the whole network by adopting the following formula: Wherein, the Is a node At the time of A local estimate of the average output voltage of the whole network, Is a node At the time of Actually measured self-output voltage An axis component of the optical fiber, In order to integrate the uniformity gain, To be at the time of From a neighbor node The received estimate of the average voltage of the whole network itself, To be at the time of The current average voltage estimate of itself, Is a node A set of adjacent nodes.
11. The bidirectional charging pile reactive and voltage distributed cooperative control method based on the consistency algorithm according to claim 1, wherein the step of obtaining the voltage correction term of each node based on the target value comprises: obtaining local voltage mismatch amounts at each node based on the target values; And calculating the voltage mismatch amount by adopting PI control to obtain a voltage correction term.
12. The bidirectional charging pile reactive power and voltage distributed cooperative control method based on the consistency algorithm according to claim 11, wherein the calculation formula of the voltage correction term is as follows: Wherein, the Is a node Is used for the voltage correction term of (a), Is a node A kind of electronic device The transfer function of the controller is such that, For the amount of local voltage mismatch, , Is a node Is used for the voltage rating of (1), Is the target value of the average voltage of the whole network.
13. The bidirectional charging pile reactive power and voltage distributed cooperative control method based on the consistency algorithm according to claim 1 or 4, wherein the calculation formula of the target voltage reference value is as follows: Wherein, the As a reference value for the target voltage, Is a node Is used for the voltage rating of (1), Is a node Is used for the reactive power sag factor of (1), Is a node The reactive power of the current output is used, Is a virtual node At the position of The exact voltage component of the shaft, Is a node Is provided.
14. The bidirectional charging pile reactive and voltage distributed cooperative control method based on a consistency algorithm according to claim 13, wherein the reactive power droop coefficient of the node is controlled by adopting the following formula: Wherein, the For the initial reactive sag factor constant, The gain is dynamically adjusted for the reactive droop factor, Is a consistency error.
15. A bidirectional charging pile reactive power and voltage distributed cooperative control system based on a consistency algorithm is characterized by comprising: The first calculation module is used for broadcasting the total reactive power shortage of the node to the neighbor nodes by taking each bidirectional charging pile as a node and receiving the total reactive power shortage of the neighbor nodes; The acquisition module is used for acquiring reactive correction based on the total reactive deficiency of the node and the neighbor node, and adjusting virtual impedance by adopting the reactive correction; The second calculation module is used for iteratively calculating the estimation of the total network average voltage by each node by adopting an integral consistency algorithm under the virtual impedance to obtain a target value of the total network average voltage; And the correction module is used for obtaining a voltage correction term of each node based on the target value, correcting the voltage reference value of each node by adopting the voltage correction term, and obtaining the target voltage reference value of each node.
16. The consistency algorithm-based bidirectional charge pile reactive and voltage distributed cooperative control system according to claim 15, wherein the total reactive power deficiency in the first calculation module includes a reactive power deficiency and a reactive power base deficiency, wherein the reactive power deficiency is related to a filter capacitance, a harmonic order, and an amplitude of a harmonic current of a corresponding node.
17. The bidirectional charging pile reactive and voltage distributed cooperative control system based on a consistency algorithm according to claim 16, wherein the calculation formula of the total reactive deficiency in the first calculation module is: Wherein, the Is the first The total reactive power shortage of the individual nodes, In the form of a reactive power base shortage, In the form of a reactive power shortage, the reactive power is, For the total number of harmonics, For the number of harmonics, Is the first The first node The amplitude of the subharmonic current is such that, For the angular frequency of the power grid, Is the first A filter capacitance of the individual nodes.
18. The bidirectional charging pile reactive and voltage distributed cooperative control system based on a consistency algorithm according to claim 15, wherein the obtaining module obtains a reactive correction amount based on a total reactive deficiency of the present node and the neighboring node, the steps comprising: obtaining a consistency error based on the difference of the total reactive power deficiency of the node and the neighbor node; and calculating the consistency error by adopting PI control to obtain the reactive correction.
19. The bidirectional charging pile reactive and voltage distributed cooperative control system based on the consistency algorithm according to claim 18, wherein the calculation formula of the consistency error in the acquisition module is as follows: Wherein, the Is a node Is used to determine the consistency error of the (c) for the (c), In order for the gain to be uniform, As a weight of the capacity of the device, Is a node Is used for the total reactive power shortage of (1), Is a node Adjacent nodes Is not shown in the prior art).
20. The bidirectional charging pile reactive and voltage distributed cooperative control system based on the consistency algorithm according to claim 19, wherein the calculation formula of the capacity weight in the acquisition module is as follows: Wherein, the Is a node Is used to determine the rated apparent power capacity of the (c), Is a node Adjacent nodes Is used for the nominal apparent power capacity of the battery.

Description

Bidirectional charging pile reactive power and voltage distributed cooperative control method and system based on consistency algorithm Technical Field The invention relates to the field of bidirectional charging pile control optimization, in particular to a bidirectional charging pile reactive power and voltage distributed cooperative control method based on a consistency algorithm. Background At the moment of the increasingly serious global environmental problems and energy shortage problems, the green energy production and consumption revolution is driven, and the construction of a clean, low-carbon, safe and efficient energy system has become a necessary trend. Under the background, the value of the Electric Vehicle (EV) in the energy field is more remarkable by virtue of the characteristics of the movable energy accumulator, so that the charging and discharging behaviors of the electric Vehicle are reasonably scheduled, the load fluctuation of a power Grid can be effectively stabilized, the peak clipping and valley filling are realized, meanwhile, the bidirectional flow (namely V2G, vehicle-to-Grid) between an energy sub-Grid and a Vehicle is realized, and the electric Vehicle has important practical significance for improving the energy utilization efficiency and guaranteeing the stable operation of the power Grid. The core idea of the V2G technology is to convert the energy storage source of the idle electric automobile into the buffer resource of the power grid, and the power-assisted micro power grid can reliably and efficiently operate through flexible charge and discharge control. However, as new energy sources such as wind energy and solar energy and electric vehicles with V2G characteristics are accessed into a power grid on a large scale, the power grid structure is gradually changed from the traditional centralized type to the distributed type and multi-source cooperative type, and the complexity is greatly improved. The transformation directly causes the peak regulation situation of the power grid to be more severe, on one hand, the new energy output has intermittence and fluctuation, and the power unbalance of the power grid is easy to be caused, and on the other hand, when a large number of V2G charging piles are in parallel operation, if effective cooperative control is lacking, the energy storage regulation effect is difficult to be exerted, and the impact on the frequency and voltage stability of the power grid is possibly caused due to the problems of uneven power distribution, transient oscillation and the like. Under the global energy transformation background, new energy power generation (wind power and photovoltaic) and Electric Vehicles (EV) are connected into a power grid in a large scale, and the micro-power grid is promoted to evolve from 'centralized' to 'distributed and multi-source cooperation'. However, this structural evolution also presents new challenges for power quality: Under the situation, how to utilize advanced energy information management technology to realize cooperative optimization among multi-energy systems (new energy, V2G energy storage and load), improve comprehensive utilization rate of energy, relieve peak regulation pressure of a power grid, and after a plurality of devices are connected in parallel, harmonic currents are overlapped, reflected and resonated to cause voltage distortion, equipment overheat and protection misoperation, a V2G pile has reactive power and harmonic suppression potential, but is different due to lack of a cooperative mechanism, harmonic treatment effect is dispersed and low-efficiency, and the problems are key problems to be solved in the current power grid system. In order to solve the problems, the existing static power distribution control scheme based on the fixed sagging characteristic adopts a mode of a local controller of the charging pile and preset static parameters, node interaction is not needed, active power is distributed according to the rated capacity of the charging pile, reactive power is set by a fixed capacitive reactance, only the basic frequency voltage index of the micro-grid is focused, and new energy fluctuation, battery SOC/SOH and user charging and discharging requirements are not included. But the technology is 1) poor in dynamic adaptation, difficult to cope with new energy/load mutation, easy to cause frequency voltage deviation beyond an allowable range, 2) high in equipment risk, capable of inducing allergy and shortening the service life of a battery by neglecting the SOC of the battery, 3) insufficient in precision, easy to deviate from a preset proportion due to power distribution without considering line impedance/equipment parameter difference, 4) easy to cause local node voltage distortion due to harmonic reactive power distribution unbalance without considering the distribution characteristic of harmonic current, and 5) incapable of responding to nonlinear load or random harmonic disturbanc