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A modeling method for electric vehicle power battery participating in power system frequency modulation considering battery life

A technology of electric vehicles and power batteries, which is applied in the field of electric vehicle power batteries participating in power system frequency modulation modeling, and can solve problems such as not considering the cycle life of electric vehicle batteries

Active Publication Date: 2019-11-05
哈尔滨鹰眼科技有限公司
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  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem that the prior art does not consider the influence of the cycle life of the electric vehicle battery and the influence of the travel state of the electric vehicle on its participation in the frequency regulation of the power system, and proposes an electric vehicle power battery that takes into account the battery life and participates in the frequency regulation of the power system modeling method

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  • A modeling method for electric vehicle power battery participating in power system frequency modulation considering battery life
  • A modeling method for electric vehicle power battery participating in power system frequency modulation considering battery life
  • A modeling method for electric vehicle power battery participating in power system frequency modulation considering battery life

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specific Embodiment approach 1

[0029] Embodiment 1: A method for modeling electric vehicle power battery participation in power system frequency modulation that considers battery life includes the following steps:

[0030] Step 1: Establish a frequency modulation model of the power system including the electric vehicle power battery module, and output the power curve of the electric vehicle power battery;

[0031] Step 2: Determine the proportion of electric vehicles connected to the grid;

[0032] Step 3: Determine the per-unit limit value of the secondary frequency modulation channel power of the power system frequency modulation model in step 1 according to step 2;

[0033] Step 4: Establish the life loss model of the electric vehicle power battery, and calculate the capacity loss and maximum energy offset of the electric vehicle power battery after participating in frequency regulation.

specific Embodiment approach 2

[0034] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the specific process of establishing the power system frequency modulation model including electric vehicle power battery module in the step 1 is as follows:

[0035] Step 11: Based on the principle of primary and secondary frequency regulation of the power system, a single-region power system frequency regulation model is established, such as figure 1 shown;

[0036] The power system contains a primary frequency modulation channel and a secondary frequency modulation channel, and the transfer function of the primary frequency modulation channel is G i (s) is the transfer function of each unit, a i is the power share coefficient of each unit, δ i is the adjustment coefficient of each unit; the transfer function of the secondary frequency modulation channel is K(s), and K(s) is the PI control function; the output of the system is the frequency deviation △f of the current s...

specific Embodiment approach 3

[0043] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that: the specific process of determining the proportion of electric vehicles entering the network in the second step is:

[0044] The invention considers the travel characteristics of the electric vehicle cluster to determine the per-unit limit value of the secondary frequency modulation channel of the power battery of the electric vehicle. According to the statistical results, the time, distance, and speed distribution curves of the proportion of private car travel are obtained. The statistical results of the data survey of floating vehicles within the Fifth Ring Road in Beijing are as follows: image 3 , Figure 4 , Figure 5 shown.

[0045] For a certain time t, the travel ratio of electric vehicle users is denoted as P(t). At any time, the distribution of electric vehicle travel distance is as follows: Figure 4 shown. When the electric vehicle travels a lo...

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Abstract

The invention discloses a modeling method for participation of an electric automobile power battery in power system frequency modulation based on consideration of the battery life, relates to a modeling method for participation of the electric automobile power battery in the power system frequency modulation, and aims to solve the problem that the influence of the cyclic life of the electric automobile battery and the travel state of an electric automobile on the participation of the battery of the electric automobile in the power system frequency modulation in the prior art. The modeling method comprises the following steps: 1, constructing a power system frequency modulation model containing an electric automobile power battery module, and outputting a power curve of the electric automobile power battery; 2, determining a networking proportion of the electric automobile; 3, determining a per unit extreme value of the power of a secondary frequency modulation channel of the power system frequency modulation model in the step 1 according to the step 2; and 4, constructing a life loss model of the electric automobile power battery, and calculating the capacity loss and the maximum energy shift of the electric automobile power battery which participates in the frequency modulation. The modeling method is applied to the field of power electrics.

Description

technical field [0001] The invention relates to a modeling method for electric vehicle power batteries participating in power system frequency modulation. Background technique [0002] Electric vehicle and grid interaction technology (V2G technology) is an important part of smart grid. Its main technology, electric vehicle, has a remarkable effect in power system frequency regulation because of its fast response and coexistence of charging and discharging modes. In the process of participating in frequency modulation services, frequent charging and discharging will cause irreversible damage to the physical structure of the electric vehicle power battery, thereby reducing its service life. Battery life is the main factor restricting the development of electric vehicles. Therefore, under the premise of considering the service life of the battery, it is of great significance to promote the development of the electric vehicle industry to establish a model of electric vehicle po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 郭钰锋张冬蕊姜伊王琦陈润欣马欣彤张童童
Owner 哈尔滨鹰眼科技有限公司
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