Method and system for controlling primary frequency modulation function of nuclear power unit with assistance of hybrid energy storage

Abstract

The invention provides a method and system for controlling a primary frequency modulation function of a nuclear power unit with the assistance of hybrid energy storage. The method comprises steps that a network frequency is divided into different intervals, including a primary frequency modulation network frequency dead interval, a small disturbance section interval, a large disturbance section interval, an ultra-large direction increasing disturbance section interval, and an ultra-large negative disturbance section interval value; the interval is judged based on the collected power grid frequency, hierarchical control is conducted through a corresponding controller, and primary frequency modulation load rising is completed by flywheel energy storage and lithium battery energy storage according to hierarchical control bearing; primary frequency modulation load reduction is completed by flywheel energy storage, lithium battery energy storage and a nuclear power unit according to hierarchical control bearing. According to the control strategy provided by the invention, the nuclear power unit participates in the network frequency overlarge direction increasing disturbance to carry out primary frequency modulation control, the operation control characteristics of the nuclear power unit are fully utilized, and control has good matching performance and applicability aiming at the load reduction one-way capability (the unit load increase is limited) of the nuclear power unit under the full-load normal working condition; and primary frequency modulation economy of the nuclear power unit is improved.

Description

technical field [0001] The disclosure belongs to the technical field of primary frequency regulation, and in particular relates to a control method and system for primary frequency regulation function of nuclear power units assisted by hybrid energy storage. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] Nuclear power units have the advantages of high fuel energy density, zero carbon emissions, and high technology maturity, and the proportion of installed capacity is increasing day by day. According to the national energy structure adjustment and development plan, the power grid side urgently needs nuclear power units with strong primary frequency regulation capabilities to assist in ensuring the power supply balance and quality of the regional power grid. [0004] At present, from the research on the participation of nuclear power unit...

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Problems solved by technology

[0005]1. There are many safety control restrictions for nuclear power units. Once the safety limit conditions are reached, the primary frequency modulation function will be blocked

[0006]2. When the primary frequency modulation acts frequently, the multiple movements of the reactor control rods will easily cause the rod drive mechanism to wear out

[0007]3. The nuclear power unit is under normal working condition with full load, and the nuclear power unit does not have the ability to increase the load by primary frequency regulation when it is fully loaded

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