A Distributed Secondary Economic Control Method for Isolated Microgrid
A technology of economic control and secondary control, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as low mediation accuracy, reliability of secondary control methods, and poor scalability, so as to improve power quality and reliability High performance and scalability, traffic and balanced effect
Active Publication Date: 2019-01-25
SOUTHEAST UNIV
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is that the existing two-level control method has poor reliability and scalability, or low mediation accuracy
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[0022] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0023] The control structure of the distributed secondary economic control method of an isolated microgrid in the present invention includes primary control and secondary control.
[0024] The primary control adopts the traditional droop control method.
[0025] Such as figure 1 As shown, the secondary control adopts a distributed strategy for generating reference voltage and frequency adjustments for the primary control, including the following steps:
[0026] 1) Establish a multi-agent (Agent) system architecture to assign agents to each distributed power source. The multi-agent system architecture includes n agents, n≥1; each agent forms a sparse distributed network, and any two adjacent Information exchange between agents, the information exchanged includes marginal cost, voltage and frequency information;
[0027] 2) Based on the obt...
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The invention discloses a distributed type two-stage economic control method for an isolated microgrid. The control structure of the microgrid comprises first-stage control and second-stage control; the first-stage control adopts a droop control way; the second-stage control adopts a distributed strategy for generating regulating quantity for reference voltages and frequencies of the first-stage control. The control method, based on a multi-agent system architecture, distributes the agents to each distributed power supply; the target active power information and the like of each power supply are obtained through the distributed strategy; then local two-stage control, and optimization of the reference voltages and frequencies of the first-stage control are carried out based on the obtained information; the economic operation of the microgrid is realized by enabling the marginal costs of the distributed power supply to be consistent; in addition, the power quality is improved by carrying out recovery of the system voltage and frequency; the economic and stable operation of the isolated microgrid can be realized under a condition of not knowing the circuit impedance by only adding a sparse distributed type communication network; and in addition, a central controller does not exist, so that high reliability and high expandability are achieved.
Description
technical field [0001] The invention belongs to the technical field of micro-grid control and optimization, and relates to a distributed secondary economic optimization control method for an isolated micro-grid. Background technique [0002] Different types of distributed power generation have different power generation costs. Traditional droop control allocates power according to the capacity ratio, which can easily lead to high system operating costs. Therefore, it is necessary to consider the cost-effective power distribution of each distributed power source. [0003] Therefore, a secondary control is introduced in the prior art to optimize the power distribution of the entire network. There are mainly two types of secondary control adopted in the prior art: centralized control and decentralized control. [0004] Centralized control uses the central controller to collect the information of the entire network, generates adjustments and then sends them to each first-level ...
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IPC IPC(8): H02J3/00H02J3/38
CPCH02J3/00H02J3/38H02J3/388Y02P80/14
Inventor 吴在军苏晨吕振宇窦晓波胡敏强
Owner SOUTHEAST UNIV