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Optimal control method and system for participation of box-type energy storage transformer substation in primary frequency modulation of power grid

A technology for optimizing control and substations, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problem of no reasonable solution for primary frequency regulation, achieve the ability to restore the state of charge, prolong service life and reliability, avoid The effect of system instability

Inactive Publication Date: 2020-10-02
HUNAN CHUTIAN ELECTRICAL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides an optimized control method and system for box-type energy storage substations to participate in the primary frequency regulation of the power grid to solve the technical problem that there is no reasonable solution for the existing energy storage substation with multiple battery groups participating in the primary frequency regulation

Method used

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  • Optimal control method and system for participation of box-type energy storage transformer substation in primary frequency modulation of power grid
  • Optimal control method and system for participation of box-type energy storage transformer substation in primary frequency modulation of power grid
  • Optimal control method and system for participation of box-type energy storage transformer substation in primary frequency modulation of power grid

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Embodiment 1

[0033] see figure 2 , a box-type energy storage substation of the present invention participates in the optimization control method of the primary frequency regulation of the power grid, including the control of the following steps:

[0034] In the frequency fluctuation area (the frequency change is large at the initial stage of the disturbance), virtual inertia control is adopted;

[0035] In the stable frequency area (after passing through the frequency deterioration period), droop control with variable coefficients is adopted, and when multiple sets of PCS are working in parallel, the working state of each energy storage unit group is partitioned according to the SOC estimation, and according to the partitioning All the energy storage unit groups in the box-type energy storage substation are classified, and the switching control of the PCS is realized according to the classified category; the switching control of the PCS includes: when discharging, the energy storage unit ...

Embodiment 2

[0048] This embodiment is a further application of Embodiment 1, which is described by taking energy storage and discharging as an example. see figure 2 , the energy storage system in this embodiment participates in the primary frequency regulation control of the power grid is roughly divided into two stages: virtual inertia response and droop control with variable coefficients, in order to optimize the frequency regulation effect of the energy storage system.

[0049] The configured energy storage system has a rated power of 60MW and a capacity of 6MWh, and consists of three sets of energy storage units with a rated capacity of 20MW / 2MWh. Name the three groups of energy storage units as No. 1, No. 2 and No. 3. The base frequency of the grid is 50Hz. Assuming that the load of the system suddenly increases, the system is temporarily unbalanced, and the frequency of the system drops instantaneously, the following will describe this embodiment to control the energy storage sys...

Embodiment 3

[0060] The present invention also provides a computer system, including a memory, a processor, and a computer program stored in the memory and operable on the processor. When the processor executes the computer program, the steps in any of the above embodiments are realized.

[0061] In summary, the present invention considers whether to put the energy storage unit into operation according to the critical overcharge and overdischarge interval of the energy storage unit, combined with the working state of the energy storage unit, the SOC value and the demand of the power grid. The working state of the energy storage unit is subdivided. When the state of charge exceeds the limit, it can also be switched automatically according to the working mode, avoiding the system instability caused by the power exceeding the limit. Without affecting the balance of the total power, the state-of-charge recovery capability of the critical energy storage unit group is realized, and the service li...

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Abstract

The invention discloses an optimization control method and system for participation of a box-type energy storage transformer substation in primary frequency modulation of a power grid. The method comprises the steps: employing virtual inertia control in a frequency fluctuation region; in a frequency stabilization zone, employing variable-coefficient droop control; when a plurality of groups of PCSs are connected in parallel to work, partitioning the working state of each energy storage unit group according to SOC estimation; and classifying all the energy storage unit groups according to the partitions, and realizing switching control of the PCS according to the categories, wherein the switching control comprises the following steps of: during discharging, putting the energy storage unit groups into operation according to the priority sequence of the SOCs from high to low, and cutting off the energy storage unit groups for standby according to the priority sequence of the SOCs from lowto high, and during charging, putting the energy storage unit groups into operation according to the priority sequence of the SOCs from low to high, and cutting off the energy storage unit groups forstandby according to the priority sequence of the SOCs from high to low. According to the invention, whether energy storage units are put into work is considered in combination with the working states of the energy storage units, the SOC values and the power grid requirements, so that the actual electric quantity balance among the energy storage unit groups is facilitated.

Description

technical field [0001] The invention relates to the technical field of energy storage substations participating in power grid frequency regulation, in particular to an optimization control method and system for box-type energy storage substations participating in primary frequency regulation of power grids. Background technique [0002] Due to the insufficient supply of petrochemical energy and the environmental pollution caused by it, wind energy and solar energy among renewable energy sources have attracted attention due to their abundant sources and little environmental pollution during utilization, but their intermittency and volatility lead to increased frequency fluctuations in the power grid. , and even affect the safe and stable operation of the power grid. In order to ensure the balance and continuity of its power supply, energy storage devices (usually battery packs) have become an important part of the power system. figure 1 It is the topology diagram of a typical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/32
CPCH02J3/32H02J3/241
Inventor 陈伟其
Owner HUNAN CHUTIAN ELECTRICAL IND
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