Control method of negative-sequence circulation current suppression system of multiple virtual synchronous machines under asymmetric working condition
A technology of virtual synchronous machine and control method, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve the problems of complex power quality of the system, influence of output power quality, etc., to ensure stable operation, improve power quality, and improve stability effect of effect
Inactive Publication Date: 2019-07-23
HUADIAN ELECTRIC POWER SCI INST CO LTD
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Problems solved by technology
[0003] However, under asymmetric working conditions, the power quality problem of the system tends to be complicated due to the diversity of MG operation modes
Especially when the MG is in the island mode disconnected from the main power supply, its output power quality is greatly affected by its own connected load
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[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.
[0034] Example.
[0035] see Figure 1 to Figure 3 It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the present invention Therefore, it has no technical substantive meaning, and any modification of structure, change of proportional relationship or adjustment of size shall still fall into the within the scope covered by the technical content disclosed in the present invention. At the same time, if terms such as "upper", "lower", "left", "right", "middle" and "one" are used in this spec...
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The invention relates to a control method of negative-sequence circulation current suppression system of multiple virtual synchronous machines under an asymmetric working condition, and belongs to thefield of energy power. The control method comprises the following steps of (1) arranging multiple virtual synchronous machines in parallel, and enabling the multiple virtual synchronous machines to self-maintain stable capability under an island running mode by inverter dual-closed loop control of the virtual synchronous machines under the island running mode; and (2) introducing negative sequence virtual impedance into voltage-current dual-closed loop control on the basis that a positive sequence and a negative sequence are effectively separated. By the control method, the purposes of suppressing negative sequence circulation current and improving electric energy quality are achieved, and the stable running capability of the system under the asymmetric working condition is optimized.
Description
technical field [0001] The invention relates to a control method of a negative-sequence circulation suppression system of multiple virtual synchronous machines under asymmetric working conditions, belonging to the field of energy and electric power. Background technique [0002] Today, when vigorously advocating the development of renewable energy, the proportion of distributed energy resources (Distributed Energy Resources, DERs) in the energy system is increasing, and the concept of Microgrid (MG) has been proposed. [0003] However, under asymmetric working conditions, the power quality problem of the system tends to be complicated due to the diversity of MG operation modes. Especially when the MG is in the island mode disconnected from the main power supply, its output power quality is greatly affected by its own connected load. In the case of multiple units running, the access of internal single-phase loads and the incomplete matching of connection line parameters make...
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Login to View More IPC IPC(8): H02J3/38H02J3/50
CPCH02J3/382H02J3/50H02J3/388
Inventor 李欣璇周宇昊张海珍牟敏刘丽丽
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD