Weak tie receiving end small electric grid tie line high resistance compensation method
A high-resistance compensation and tie-line technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve problems such as self-excitation easily caused by generators, excessive charging reactive power in local power grids, etc., and achieve power flow and voltage well-distributed effect
Active Publication Date: 2015-04-22
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +1
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[0007] The purpose of the present invention is to provide a method for high-resistance compensation of the tie line of the small power grid at the receiving end of the weak connection, so as to solve the problem that the charging reactive power of the local power grid exceeds the standard and the generator is easy to cause self-excitation
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[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0023] The traditional tie line high reactance compensation method is to determine the position of the high reactance according to the power frequency overvoltage level, and the capacity of the high reactance is 60% to 70% of the total charging reactive power of the line. But in fact, only to suppress the power frequency overvoltage of the line does not require high resistance capacity to reach this level, often only 20% to 30% of the high resistance can limit the power frequency overvoltage to below 1.3pu. Therefore, the present invention proposes to install a high-resistance solution at both ends...
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The invention relates to the field of a local small electric grid networking engineering and design, in particular to a weak tie receiving end small electric grid tie line high resistance compensation method. The method includes the following steps: a systematic electromagnetic transient simulation model is built, the charging reactive power total quantity Qc and the high resistance compensation quantity Qh1 of a tie line are confirmed, the capacity Qh12 of parallel high resistance of a small electric grid side of a tie line receiving end is confirmed, the capacity Qh11 of parallel high resistance of a main grid side of the tie line is confirmed, and according to the capacity Qh11 of the parallel high resistance of the main grid side of the tie line and the capacity of Qh12 of the parallel high resistance of the small electric grid side of the tie line receiving end, high resistance of the weak tie receiving end small electric grid tie line is arranged. Requirements of local electric grid self-excitation prevention and control and power frequency excess voltage suppression are synthetically considered, meanwhile, consideration is given to the character of system steady state voltage regulating so that power flow and voltage of the kind of an electric grid are distributed more reasonably.
Description
technical field [0001] The invention relates to the field of networking engineering and design of local small power grids, in particular to a high-resistance compensation method for a tie line of a small power grid at a weak connection receiving end. Background technique [0002] Such as figure 1 As shown, the long-distance tie line can generate a large amount of charging reactive power. The charging reactive power may cause the power frequency overvoltage of the tie line to exceed the allowable value of 1.3pu specified in the standard; if the small power grid contains a small generator, it may also cause the generator to self-excite. [0003] Generally, the high impedance of the line is used to compensate the charging reactive power of the line. In engineering design, it is necessary to determine the high resistance capacity and the location of installation. At present, the high-resistance capacity is generally taken as 60% to 70% of the total charging reactive power of ...
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IPC IPC(8): H02J3/20
CPCY02E40/30
Inventor 张华丁理杰汤凡
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST