A dstatcom group reactive power and voltage coordinated control method based on improved slope regulation
A slope adjustment and coordinated control technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, flexible AC transmission systems, etc., and can solve problems such as lack of in-depth research
Inactive Publication Date: 2017-01-04
CHINA SOUTHERN POWER GRID COMPANY
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However, how to coordinate and control the reasonable distribution of reactive power output when multiple DSTATCOMs are running simultaneously in adjacent areas of the distribution network system has not been studied in depth.
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[0063] The attached drawings are only for illustrative purposes, and cannot be understood as a limitation of this patent;
[0064] In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product;
[0065] For those skilled in the art, it is understandable that some well-known structures in the drawings and their descriptions may be omitted.
[0066] The technical solution of the present invention will be further described below in conjunction with the drawings and embodiments.
[0067] The following is a simulation of two lines in a 10kv distribution network system containing two DGs and a STATCOM at the corresponding DG grid-connected points. The reference power of the system is 10MVA. figure 1 , Each line has its own DG with a rated capacity of 3MW, the first line has a DSTATCOM with a rated capacity of 1.5Mvar, and the second line has a DSTATCOM with a rated capacity of 3Mvar. The wir...
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The invention discloses a coordination control method of reactive voltage of a DSTATCOM group based on slope adjustment. The method is used for achieving reactive complementation of a plurality of DSTATCOMs in the same area. The method comprises the following steps of establishing a relation between the reactive voltage under a net rack parameter condition and DSTATCOM output reactive current under the slope adjustment, setting an adjustment slope of each DSTATCOM according to the maximum reactive capacity of devices, reasonably distributing reactive output of each device, adding a proportional gain as negative feedback based on reference voltage, forming a new voltage reference value of each DSTATCOM, and establishing the coordination control method of the DSTATCOM group based on the slope adjustment. According to the method, the DSTATCOMs are subjected to coordination control based on the slope adjustment under no communication; reasonable distribution of the reactive output of each reactive compensating device is achieved; optimized operation of equipment is achieved; and safe and stable operation of a grid is ensured.
Description
Technical field [0001] The present invention relates to the field of power systems, and more specifically, to a DSTATCOM group reactive voltage coordinated control method based on improved slope adjustment. Background technique [0002] A large number of new energy sources connected to the distribution network will bring many new problems to the distribution network system, among which the problem of reactive power and voltage is one of the most concerned issues. At present, the installation of reactive power compensation devices at new energy grid-connected points is the most common means to maintain the voltage stability of the grid-connected points. [0003] The power system is a dynamic balance system in which power generation, transmission and distribution are carried out at the same time. The instantaneous imbalance of the power system will cause system safety and stability problems. Therefore, reactive power compensation devices are required to respond quickly. However, in ...
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IPC IPC(8): H02J3/18
CPCY02E40/10Y02E40/30
Inventor 魏承志丁晓兵刘年黄维芳苏杰和文安金鑫杨颖安李正红沈添福
Owner CHINA SOUTHERN POWER GRID COMPANY