Depth control method and contribution analysis method for energy storage power station participating in primary frequency modulation of power grid

Abstract

The invention discloses a depth control method for an energy storage power station participating in primary frequency modulation of a power grid, which is characterized in that a grid-connected inverter of the energy storage power station is equivalent to a synchronous voltage source with excitation control and speed regulation control, the energy storage power station adopts a control strategy ofa synchronous machine third-order model, and the frequency modulation depth of the battery energy storage power station participating in the primary frequency modulation of the power grid by settinga difference adjustment coefficient sigma<battery>% of the energy storage power station according to a flexibility index and a static frequency characteristic of the battery energy storage power station. The invention further discloses a contribution calculation method for the energy storage power station participating in primary frequency modulation of the power grid. The frequency modulation depth of the energy storage power station participating in system primary frequency modulation is controlled, so that the rated power, the rated capacity and the climbing rate of the energy storage powerstation are reasonably configured to stabilize the steady-state frequency of the system after primary frequency modulation in a reasonable range, the frequency stability and the voltage stability ofthe energy storage power station for supporting grid connection of the new energy system are improved, a contribution factor lambda is defined, and the importance of the energy storage power station in the power grid system to frequency modulation is analyzed.

Description

technical field [0001] The invention belongs to the technical field of municipal renewable energy grid connection, and specifically relates to a method for controlling the depth of energy storage power stations participating in the primary frequency regulation of the power grid, and also relates to a method for analyzing the contribution of the energy storage power station participating in the primary frequency regulation of the power grid. Background technique [0002] The grid-connection of large-scale renewable energy improves the energy structure and at the same time poses a huge challenge to the control and operation of the grid. At this stage, the grid-connection of energy storage power stations mainly relies on traditional PQ control, PV control, VF control, droop control and other methods . First of all, using these methods, the grid-connected inverter port has almost no inertia characteristics and damping characteristics similar to synchronous generators, and cannot...

AI Technical Summary

Problems solved by technology

First of all, using these methods, the grid-connected inverter port has almost no inertia characteristics and damping characteristics similar to synchronous generators, and cannot suppress power fluctuations when the grid receives disturbances, and the support capacity for grid voltage and frequency is obviously insufficient

Secondly, due to the intermittent and fluctuating nature of power generation in new energy systems, it is difficult to maintain a certain amount of active power reserve

At the same time, in the case of load power fluctuation interference between new energy and traditional synchronous generator systems, new energy cannot provide effective power support, and its fluctuating power is ultimately borne by traditional synchronous generators. According to the static frequency characteristics of synchronous generators, it is bound to It will cause corresponding frequency deviation. Due to the limitation of frequency deviation, the frequency modulation depth of the new energy and traditional synchronous generator system is insufficient, and there is no ability to resist high-power disturbance under certain circumstances. Therefore, the energy storage power station has its own flexible power throughput The control method supporting the stability of new energy power grid connection has attracted much attention

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