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Capacity optimization configuration method for hybrid energy storage system orientating optimization operation of power distribution network

A technology of hybrid energy storage system and capacity optimization configuration, which is applied in the field of energy storage and can solve problems such as the optimal operation of HESS distribution network without consideration

Inactive Publication Date: 2017-08-01
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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  • Application Information

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Problems solved by technology

[0004] The traditional method uses the hybrid energy storage system (Hybrid energy storage system, HESS) to stabilize the fluctuation of the new energy output power, without considering the HESS to participate in the optimal operation of the distribution network

Method used

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  • Capacity optimization configuration method for hybrid energy storage system orientating optimization operation of power distribution network
  • Capacity optimization configuration method for hybrid energy storage system orientating optimization operation of power distribution network
  • Capacity optimization configuration method for hybrid energy storage system orientating optimization operation of power distribution network

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Embodiment 1

[0107] The optical storage system in the embodiment of the present invention is as figure 1 Shown, C 1 It is a unidirectional DC / DC converter, which mainly realizes boost function and maximum power point tracking (MPPT); C 2 It is a bidirectional DC / DC converter to realize power controllable charging and discharging, so that the grid-connected active power of the system is the optimal active power participating in the optimal operation of the distribution network; C 3 It is a DC / AC inverter (that is, a photovoltaic inverter), which is used to stabilize the DC bus voltage and realize optimal grid connection of active and reactive power; photovoltaic power generation units (such as figure 1 photovoltaic cell array) and energy storage units are aggregated to the common DC bus through their respective DC / DC converters, and then connected to the power distribution system through a public DC / AC inverter; it is assumed that the photovoltaic storage system outputs power to the grid ...

Embodiment 2

[0256] In the embodiment of the present invention, the actual output power data (sampling time is 1 min) of a photovoltaic power station in Jiangsu Province on a typical day in 2013 is used for simulation analysis in Matlab. A 33-node power distribution system is used to optimize the solar-storage system for one day, and the daily output curve and load daily operation curve of the photovoltaic power station are obtained by using the photovoltaic power prediction method and the load prediction method respectively, as shown in Fig. image 3 As shown, the optimal operation model of the optical storage system participating in the active distribution network proposed in the present invention is constructed, and the two-dimensional dynamic programming algorithm is used to solve the model to obtain the optimal output of the optical storage system participating in the operation of the distribution network. The difference between the optimal output of the typical solar storage system pa...

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Abstract

The invention discloses a capacity optimization configuration method for a hybrid energy storage system orientating optimization operation of a power distribution network. The capacity optimization configuration method comprises the steps of obtaining imbalance power between the optimal output and photovoltaic actual output when an optical storage system participates in operation of the power distribution network firstly, taking the imbalance power as a hybrid energy storage reference power, adopting ensemble empirical mode decomposition to decompose the imbalance power into a series of intrinsic mode functions, and performing recursion Hilbert conversion to obtain an instantaneous frequency-time curve of each intrinsic mode function separately; according to power type and energy type energy storage characteristics, determining crossover frequency by taking least aliasing of the instantaneous frequency-time curves as a principle, and stabilizing the high-frequency components and low-frequency components of the imbalance power by adopting power type energy storage and energy type energy storage respectively; and finally, by considering charging-discharging efficiency, state of charge and life cycle cost, a power type and energy type energy storage rate power and rate capacity economic optimal configuration scheme is proposed. Compared with a conventional method, new energy output can be compensated, consumption capability to new energy can be improved, and active participation to the optimization operation of the power distribution network can be realized.

Description

technical field [0001] The invention belongs to the technical field of energy storage participating in the optimal operation of a distribution network, and in particular relates to a capacity optimization configuration method of a hybrid energy storage system oriented to the optimal operation of a distribution network. Background technique [0002] Clean energy power generation technologies represented by photovoltaics are profoundly changing the power and energy structure around the world. However, there are problems such as randomness and intermittency in photovoltaic power generation, and high-permeability photovoltaic grid connection will have a serious impact on the power flow distribution and power quality of the distribution network. Therefore, it is necessary to configure energy storage in the distribution network to balance the random fluctuation of the output power of photovoltaic power plants. [0003] The combination of energy storage system and photovoltaics ca...

Claims

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Application Information

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IPC IPC(8): H02J3/28H02J3/38
CPCH02J3/28H02J3/383H02J2203/20Y02E10/56Y02E70/30
Inventor 葛乐袁晓冬陈兵陆文涛史明明张宸宇费骏韬罗珊珊朱卫平
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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