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Source-load coordinated frequency modulation method based on a load frequency control model

A load frequency control and model technology, which is applied in load forecasting, energy storage, and AC network load balancing in AC networks, can solve problems such as difficulty in meeting user load demands, waste of renewable energy, increased microgrid construction and investment costs, etc. question

Active Publication Date: 2018-09-21
HEFEI UNIV OF TECH
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Problems solved by technology

For the development of the microgrid, the solution of blindly increasing the energy storage capacity and expanding the installed capacity is difficult to meet the increasing user load demand in the microgrid system, which will greatly increase the development and investment costs of the microgrid. Reduce the use efficiency of new energy and cause a lot of waste of renewable energy

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  • Source-load coordinated frequency modulation method based on a load frequency control model
  • Source-load coordinated frequency modulation method based on a load frequency control model
  • Source-load coordinated frequency modulation method based on a load frequency control model

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Embodiment Construction

[0076] In the present invention, the structure of the multi-source micro-grid system in two regions of the island is as follows: figure 1 As shown, including: real-time data and historical database, AGC controller, micro-grid system sub-module;

[0077] Real-time data and long-term historical database include regional control deviation, frequency deviation, tie line power deviation, flexible load variation, active power output of each distributed power source, rigid load power, and flexible load power;

[0078] The AGC controller establishes a microgrid infinite time discount cost function with the goal of minimizing the total operating cost of the isolated island two-region microgrid system, and uses the regional control deviation, frequency deviation, tie-line power deviation, and flexible load change as the system state according to the system feedback Select the optimization strategy to output the output adjustment amount of the micro gas turbine unit, the small-scale hydr...

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Abstract

The invention discloses a source-load coordinated frequency modulation method based on a load frequency control model. The method comprises steps of: 1, using a micro gas turbine unit, a small-scale hydroelectric generating unit and a flywheel energy storage system as a frequency modulation unit; 2, establishing a load frequency control model corresponding to the micro gas turbine unit, the small-scale hydroelectric generating unit, the flywheel energy storage system, wind power generation, photovoltaic power generation and a user load; 3, establishing a micro-grid MDP mathematical model for any region of an island two-region multi-source micro-grid; 4, acquiring data required by source-load coordinated frequency modulation of the island two-region micro-grid; and 5, solving the MDP mathematical model by using a simulated-annealing-based Q learning theory algorithm. The frequency of the island two-region micro-grid system is stabilized by the source-load coordinated method and an AGC controller based on the learning optimization method, such that system safety stability is improved.

Description

technical field [0001] The invention belongs to the field of micro-grid control, and specifically relates to a load frequency control model and source-load coordinated frequency modulation method of a micro-grid with heterogeneous energy sources and two regions. Background technique [0002] The isolated island microgrid has the advantages of less pollution, high reliability, and high energy utilization efficiency. Random changes in medium load, these factors will cause the active power of the island microgrid to lose balance, and the frequency will deviate greatly from the rated value, exceeding the range of safe operation. Therefore, when the microgrid operates in an island mode, it is necessary to ensure its own voltage stability and maintain frequency stability, and it is necessary to effectively adjust the frequency of the microgrid. [0003] At present, there is little research and attention on the micro-grid system in the island and two regions, and there is a lack o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/46H02J3/30
CPCH02J3/003H02J3/24H02J3/30H02J3/381H02J3/382H02J3/383H02J3/386H02J3/388H02J3/46H02J2203/20Y02E10/56Y02E10/76Y02E60/16Y02E70/30
Inventor 唐昊王鹏鹄吕凯李怡瑾张延
Owner HEFEI UNIV OF TECH
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