Patent ID: 11959455
Assignee: NORTH CHINA ELECTRIC POWER UNIVERSITY
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  H  Y | IPC F  H

Claim 2:
3. A control device of an energy-storage coordinated floating wind turbine, comprising:
a first constructing module, configured to acquire a frequency response unit configured for a floating wind farm, and construct a primary frequency regulation model of the floating wind farm based on the frequency response unit, wherein the floating wind farm comprises a plurality of floating wind turbines, each of the floating wind turbines is configured with the frequency response unit, and the frequency response unit is configured to respond to a frequency change of a power system;
a second constructing module, configured to acquire an energy storage system configured for the floating wind farm, and construct a second frequency regulation model based on the energy storage system, wherein each of the floating wind turbines is configured with the energy storage system;
a third constructing module, configured to construct, based on the primary frequency regulation model and the second frequency regulation model, a frequency regulation model of a hybrid power system containing the floating wind farm, the energy storage system, and a pre-set thermal power unit;
a strategy module, configured to acquire a frequency change parameter of the power system through the frequency response unit, calculate a primary frequency regulation control strategy of the floating wind turbine through the primary frequency regulation model based on the frequency change parameter, and calculate the second frequency regulation control strategy of the energy storage system through the second frequency regulation model; and
a control module, configured to generate an overall frequency regulation control strategy of the hybrid power system according to the primary frequency regulation control strategy and the second frequency regulation control strategy;
wherein the frequency response unit performs a comprehensive control by using a pre-set virtual inertia control mode and a droop control mode;
the primary frequency regulation model comprises a frequency regulation branch corresponding to each of the floating wind turbines, wherein the frequency regulation branch is configured to calculate a frequency regulation output power change amount of each of the floating wind turbines according to a pre-set inertia control parameter and a droop control parameter; and
the step of constructing a primary frequency regulation model of the floating wind farm based on the frequency response unit comprises:
calculating the frequency regulation output power change amount of each of the floating wind turbines through the primary frequency regulation model, and collecting and processing the frequency regulation output power change amount, so as to generate an output change amount during frequency regulation of the floating wind farm;
wherein the energy storage system is a battery energy storage system, wherein the battery energy storage system comprises an energy storage battery, an energy management system, and a power conversion system;
the second frequency regulation model comprises an energy conversion mechanism model of the energy storage system, wherein the energy conversion mechanism model is configured to characterize a charge and discharge logic of the energy storage system; and
the step of constructing a second frequency regulation model based on the energy storage system comprises:
detecting a frequency feedback signal of the power system through the power conversion system; and
calculating, based on the second frequency regulation model, a compensation power of the energy storage system according to the frequency feedback signal, wherein the compensation power is configured to compensate for a frequency deviation caused by a frequency disturbance of the power system;
wherein the step of calculating a primary frequency regulation control strategy of the floating wind turbine through the primary frequency regulation model based on the frequency change parameter comprises:
generating, based on the primary frequency regulation model, the primary frequency regulation control strategy by using a rotor kinetic energy control frequency regulation strategy and an overspeed load-shedding control strategy, so as to perform a frequency regulation control over the floating wind turbine;
wherein the step of calculating a second frequency regulation control strategy of the energy storage system through the second frequency regulation model comprises:
setting a constraint range of the energy storage battery based on remaining capacity parameters of the energy storage battery; and
calculating the second frequency regulation control strategy within the constraint range, wherein the second frequency regulation control strategy comprises:
controlling the energy storage battery to absorb or release an active power in accordance with a pre-set virtual inertia control strategy according to the frequency feedback signal; or, controlling the energy storage battery to be charged or discharged in accordance with a pre-set droop control strategy;
wherein the step of generating an overall frequency regulation control strategy of the hybrid power system according to the primary frequency regulation control strategy and the second frequency regulation control strategy comprises:
setting a frequency regulation dead band of the energy storage battery in accordance with a pre-set frequency change threshold;
performing, within a frequency change range corresponding to the frequency regulation dead band, the frequency regulation control over the hybrid power system through the primary frequency regulation control strategy; and
performing, outside the frequency change range corresponding to the frequency regulation dead band, the frequency regulation control over the hybrid power system through the primary frequency regulation control strategy; and performing, within the constraint range, the frequency regulation control over the hybrid power system through the second frequency regulation control strategy.