Method for suppressing sub-synchronous oscillation (SSO) of wind power by using static synchronous series compensator (SSSC)
A technology of subsynchronous oscillation and series compensation, applied in the direction of reducing/preventing power oscillation, wind power generation, reactive power adjustment/elimination/compensation, etc.
Pending Publication Date: 2021-06-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
Existing literature mainly focuses on the problem of SSSC suppressing SSO of thermal power units, and there is no literature report on the problem of SSSC suppressing SSO of wind power
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[0034] The present invention will be further explained in accordance with the accompanying drawings in accordance with specific embodiments. This embodiment is carried out in the technical solution proposed in the present invention and the detailed implementation step procedure is given. However, the scope of the invention is not limited to the following examples.
[0035] figure 1 The stationary synchronous series compensator for the present embodiment suppresses the wind power through the serialization system delivery schematic, such as figure 1 As shown, the total impedance of the wind farm on the system oscillation frequency is Z DFIG (f sub ), Including all wind turbine impedances (Z DFIG1 ,...,Z DFIGn ) And boost resistance Z T . The total impedance of the grid side in the system oscillation frequency is Z GRID (f sub ), Including string repair line impedance Z CL , System equivalent impedance z sys And serial charge resistance. The stationary synchronous series compensator...
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The invention discloses a method for suppressing a sub-synchronous oscillation (SSO) of wind power by using a static synchronous series compensator (SSSC). The method comprises the steps that a static synchronous series compensator is connected in series in a wind power base delivery collection line through a coupling transformer, and when subsynchronous oscillation occurs in a system, the static synchronous series compensator outputs a subsynchronous voltage component with the same phase as subsynchronous oscillation current in the collection line where the static synchronous series compensator is located; at the moment, the static synchronous series compensator is equivalent to a positive resistor under the system oscillation frequency; and by changing the amplitude of the subsynchronous voltage output by the static synchronous series compensator, the total resistance under the oscillation frequency of the system is increased to a positive value interval, so that the system has positive damping, and the wind power subsynchronous oscillation is effectively suppressed. According to the method for suppressing the sub-synchronous oscillation of the wind power, a new scheme is provided for solving the problem of the wind power sub-synchronous oscillation.
Description
Technical field [0001] The present invention belongs to the field of power system stabilization control, and more specifically, it belongs to the technical field of new energy wind power safety grid control technology. Background technique [0002] The new energy technology is rapidly developed, and many thousand thousandwawn large wind power bases have been put into operation in my country. Large wind power bases are far from the load center, and the new energy is long-distance delivery is a common means of solving the problem. However, there is a risk of induced sub-synchronous oscillation (SSO) when the large wind power base is applied to exogenous power of the SM-Synchronous Oscillation, SSO. Among them, the stability problem of the mainstream dual-fed wind power unit (DFIG) is particularly prominent and has received attention. [0003] Currently, many solutions have been proposed for the SSO issue of suppressing DFIG-serial completion systems. Mainly focused on the transform...
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IPC IPC(8): H02J3/24H02J3/38H02J3/18H02J3/01
CPCH02J3/24H02J3/1807H02J3/01Y02E10/76Y02E40/40Y02E40/10
Inventor 高本锋王飞跃张寒周长健赵书强
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)