Distributed coordinated control method for autonomous-type microgrid system based on inverters
A technology of distributed coordination and control method, which is applied in the field of distributed coordination control of inverter-based autonomous microgrid system, which can solve the problem of large workload of system parameters, low stability of regulation and control, and reduced system adaptability, etc. problem, to achieve the effect of improving reliability and robustness
Active Publication Date: 2018-09-04
FOSHAN SHUNDE SUN YAT SEN UNIV RES INST +2
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The current microgrid system generally realizes the dynamic adjustment of the inverter by changing the pre-designed control parameters. Since the modification of the system parameters requires a large workload, and the temporary modification of the parameters may reduce the adaptability of the system, so In practice, using this method to implement regulatory control is not very stable.
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[0036] refer to figure 1 and figure 2 , a kind of inverter-based autonomous microgrid system distributed coordination control method of the present invention, comprises the following steps:
[0037] S1. When the microgrid system does not reach the balance of supply and demand, use the droop control as a primary control to adjust the value of the power generation of each inverter until the value satisfies the system steady-state equation ①, so as to achieve the balance of supply and demand:
[0038] ΔP i (t)=P gi (t)-P li (t)-P i out (t)=0①
[0039] Among them, ΔP i (t) represents the supply-demand mismatch value on the i-th node, P gi (t) represents the power generation on the i-th node, P li (t) represents the load demand on the i-th node, P i out (t) represents the net outflow active power of the i-th node;
[0040] The droop control adjustment equation in the adjustment process is:
[0041]
[0042] in, Indicates the change rate of the power generation of...
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The invention discloses a distributed coordinated control method for an autonomous-type microgrid system based on inverters, and the method comprises the following steps: employing sag control as primary control when the microgrid system does not reach the supply and demand balance, and adjusting the power generation values of all inverters till the supply and demand balance is reached; adjustingthe frequency of a microgrid through a distributed secondary control method when the microgrid system reaches the supply and demand balance, and eliminating the frequency deviation through the adjustment of the voltage phase angles of the inverters. According to the invention, the predesigned control parameters do not need to be changed, and the method and system can enable all inverters to reachdynamic consistency only through the information exchange between a local node and a neighbor node, and achieve the supply and demand balance. Meanwhile, the method and system guarantee that the frequency of the microgrid restores nearby a normal reference value, and can improve the reliability and robustness of the system.
Description
technical field [0001] The invention relates to the field of smart grid control, in particular to an inverter-based distributed coordinated control method for an autonomous micro-grid system. Background technique [0002] A microgrid usually refers to a small medium-low voltage power system formed by distributed power sources, loads, and energy storage systems. More and more distributed power sources from renewable energy have been integrated into the microgrid system. Compared with microgrid, it is not only more friendly to the environment, but also can use scattered resources to provide power to remote areas and rural areas, so as to achieve the purpose of adapting measures to local conditions and reduce construction and operation costs. The current microgrid system generally realizes the dynamic adjustment of the inverter by changing the pre-designed control parameters. Since the modification of the system parameters requires a large workload, and the temporary modificati...
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IPC IPC(8): H02J3/46
CPCH02J3/46
Inventor 但唐也许银亮唐晓颖
Owner FOSHAN SHUNDE SUN YAT SEN UNIV RES INST