lin91957
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 Posted: Wed 0:13, 01 Dec 2010 Post subject: north face outlet Symmetrical Component Coordinate |
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Symmetrical Component Coordinate Based Harmonic Power Flow Model
...,) Have been identified, let the higher harmonic voltage r, 12 ¨ 0 (a +1, +2, ...) The initial value is 0, into (20) may be higher harmonic current injection '( a +1, +2, ...), the 120 into the linear equation p120 = yn12 (h. 12 '¨ 0 can be high harmonic voltage correction value 120 (a +1, +2, ...); ( 6) through the inverse transform coordinates uUnb (h = Ta ... bcI ~ ~ n (h, can be the node voltage of the second phase content. The P-Q decomposition can be the basic steps of the flow chart shown in Figure 8. Simplification of the network node clock point search halogen Il; I form a positive sequence admittance matrix. form a negative sequence admittance matrix y to form zero sequence admittance matrix y'III mouth and the formation of the formation of fundamental y 'y form factor table 'harmonic flash factor table in the child table lII2004 1 Gu Wei et al: Symmetrical Component Coordinate Based Harmonic Power Flow Model 5 ・ I === tllt calculate PV,[link widoczny dla zalogowanych], PQ node into the power of positive sequence fundamental calculated zero sequence, negative sequence current calculation of asymmetric transmission lines into the nodes at both ends of the base I into the power of positive sequence compensation. juice calculated negative sequence and zero sequence compensation. the Lord into the calculation of negative sequence current JlrJI node into the calculation of zero sequence current node into the Si current, nD ● I the previous generation, back to the previous generation of solutions U have to return one by one generation of solutions ● I have a high harmonic power flow calculation N ■ \ y ,?:\end) IPQ decoupled fundamental positive sequence current method. Fixed ou. are fundamental positive sequence harmonic source node voltage J low order harmonic injection current juice operator f: ftU one. uU, l |, ..., nI previous . back to the generation of solutions have U '(l2n) J into the compute node positive sequence harmonic active pL \IAP =- AP ~ ... + A (h = 2,3. .... I) AQ = AQ,[link widoczny dla zalogowanych], \Example of Queensland together with power quality simulation system} developed a practical harmonic power flow program, programs written in Fortran. The following is the calculation of a small network example, this network of 16 nodes and 17 branches, 7 sets of transformers, two generating units,[link widoczny dla zalogowanych], nine common load, three harmonic load source. specified convergence accuracy of the power node 10, is calculated using PQ decoupled method (easy to handle, for example, with the constant current source of harmonic sources said.) Simply complete the calculation iteration 6, we can see the convergence of the algorithm, fast is better to meet the requirements of real-time systems. EMTP simulation software using the network harmonic power flow calculation, and this is basically the same results show that this trend of higher reliability of the algorithm. From the above results can analyze the harmonic harmonic source in the spread in the distribution network: The harmonic source for 6-8,11,13 greatest impact of node, causing the voltage of these nodes larger distortion. so harmonic sources for further analysis of the impact on power quality to provide evidence. Table 2 harmonic source parameters (unit: pu) Tab.2Parametersofharmonicsources (pu) Table 3-phase harmonic voltage node (unit: pu) Tab.3Harmonicvoltagesatdifferentbuses (pu) voltage of node A, B phase voltage phase C-phase voltage 5 Conclusion This study can be obtained through the following conclusions: (1) the establishment of an asymmetric load,[link widoczny dla zalogowanych], asymmetric line coordinates in the symmetrical component of a compensation decoupling model, in order to achieve decoupling of the three sequence components calculation. greatly reduce the nodal admittance matrix of the order, reducing memory requirements and improve computing speed; (2) The partial decoupling of the fundamental and harmonic power flow algorithm, that is, fundamental trend in the calculation of the time without considering the impact of high harmonics can further improve the algorithm's speed; (3) the use of the method proposed in this paper calculates the phase current, voltage,[link widoczny dla zalogowanych], the actual magnitude and angle, and can also be current, voltage sequence component. References: 1 Panyun Jiang, Zhao Shuqiang, Chen Bin, Shen Qi. the trend of power system harmonic asymmetry A practical calculation method [J]. Power Systems, 2000,24 (9): 60 - 622 Chen Qian. based on symmetrical component coordinate system of three-phase asymmetrical power flow calculation [D]. Nanjing: Southeast University, Department of Electrical Engineering, 2000 (continued on page 73)
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