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Transformer area flexible resource distributed coordination method, device and system capable of meeting EV charging requirements

A technology of distributed coordination and charging requirements, applied in circuit devices, photovoltaic power generation, electrical components, etc., can solve problems such as inability to stably match, large fluctuations in output power, and no consideration of AC and DC bus voltage regulation of the power grid.

Inactive Publication Date: 2020-10-16
NARI NANJING CONTROL SYST +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the isolated island operation microgrid is easily affected by factors such as geographical location and weather conditions, it has obvious intermittent nature, and the output power fluctuates greatly. It cannot be stably matched with the conventional power load, and it is easy to cause adverse phenomena such as large fluctuations in power interaction with the grid. , put forward higher requirements on the frequency regulation and voltage regulation capabilities of the power grid
Most of the controller regulation is considered without considering the voltage regulation of the AC and DC bus of the grid, and the research in the AC-DC hybrid microgrid for island operation is more important

Method used

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  • Transformer area flexible resource distributed coordination method, device and system capable of meeting EV charging requirements
  • Transformer area flexible resource distributed coordination method, device and system capable of meeting EV charging requirements
  • Transformer area flexible resource distributed coordination method, device and system capable of meeting EV charging requirements

Examples

Experimental program
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Effect test

Embodiment 1

[0069] An embodiment of the present invention provides a distributed coordination controller for flexible resources in the station area that meets EV charging requirements. The distributed coordination controller is set between the DC bus and the AC bus and connected to the inverter, such as figure 2 shown, which includes:

[0070] The Prak transformation unit performs Prak transformation on the acquired AC bus instantaneous voltage, AC bus instantaneous current, inverter output voltage, and inverter output current;

[0071] The power calculation unit calculates the instantaneous active power and instantaneous reactive power of the AC bus based on the instantaneous voltage of the AC bus and the instantaneous current of the AC bus transformed by the park;

[0072] A droop control unit (that is, a power-based droop control unit) performs droop control calculation on the instantaneous active power and instantaneous reactive power, and obtains the power angular frequency of the A...

Embodiment 2

[0116] A microgrid consisting of n electric vehicle charging piles can communicate through a sparse communication network. The communication graph is also called a weighted directed graph, which represents the connection set G=(V G ,ε G ,A G ), where V G ={V 1 ,V 2 ,V 3 ,...,V n} is the set of all nodes; Is a collection of node pairs, that is, the interconnection relationship information between nodes; A G =[a ij ] N×N is a weighted adjacency matrix of dimension N×N, giving information about the interconnectivity between nodes. The communication between node i and node j is expressed as follows:

[0117]

[0118] Among them: a i×j Denotes the communication link weight from unit j to i.

[0119] To this end, a distributed coordination control method is provided in an embodiment of the present invention, including:

[0120] Using the local information of an electric vehicle charging pile and the voltage information of its adjacent electric vehicle charging pile...

Embodiment 3

[0146] Based on the same inventive concept as in Embodiment 2, the embodiment of the present invention provides a distributed coordination and control device for flexible resources in a station area that meets EV charging requirements, including:

[0147] The calculation unit is used to calculate the average output voltage by using the local information of an electric vehicle charging pile and the voltage information of its adjacent electric vehicle charging piles;

[0148] The control unit is used to calculate the voltage deviation between the average output voltage and the DC bus voltage, and determine whether to start the distributed coordinator in Embodiment 1 according to the calculation result to complete the distributed coordinated control.

[0149] All the other parts are the same as in Example 2.

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Abstract

The invention discloses a transformer area flexible resource distributed coordination method, device and system capable of meeting EV charging requirements. The system comprises a power calculation unit, a droop control unit, a voltage controller, a current controller and an inversion unit, wherein the power calculation unit calculates instantaneous active power and instantaneous reactive power ofan AC bus based on the instantaneous voltage and instantaneous current of the AC bus after park conversion, the droop control unit performs droop control calculation on the instantaneous active powerand the instantaneous reactive power to obtain a power angular frequency of the AC bus and a voltage calculated value of the AC bus, the AC bus voltage calculation value is processed by a voltage controller and a current controller to obtain a calculation value of the output voltage of the inverter, and the inversion unit performs PWM modulation on the power angular frequency of the AC bus and the calculated value of the output voltage of the inverter, and outputs an alternating signal to control the output voltage of the AC bus. According to the invention, the optimized operation capabilityof the charging station can be improved, so that the resource flexibility in the charging process of the electric vehicle in the transformer area is ensured.

Description

technical field [0001] The invention belongs to the technical field of driving safety of electric vehicles, and in particular relates to a method, device and system for distributed coordination of flexible resources in a station area to meet EV charging requirements. Background technique [0002] With the rapid development of electric vehicles (Electric Vehicle, EV) and the extensive application of distributed power generation, the AC / DC hybrid microgrid is also making continuous progress. In recent years, the electric vehicle industry has developed rapidly. As an important means to reduce carbon emissions, the production and sales of electric vehicles in my country have grown rapidly, and the market has developed rapidly. From the perspective of the growth of electric vehicles, electric vehicles will usher in explosive growth in the future . Make full use of the advantages of AC and DC power systems, research and realize the commercial operation of AC and DC hybrid microgri...

Claims

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Application Information

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IPC IPC(8): H02J3/48H02J3/50H02J3/38
CPCH02J3/48H02J3/50H02J3/381H02J3/388H02J2300/26Y02E10/56
Inventor 孙广明陈良亮张卫国成海生郑红娟陈嘉栋周材孙季泽杨凤坤邵军军余洋李化顾琳琳
Owner NARI NANJING CONTROL SYST
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