| Electrical energy plays an important role in the economic development andpeople’s lives, In recent years, with widely used of the non-linear load in thegrid,which cause the problem of electric quality such as voltage fluctuation and lowpower factor, and reactive power variation have greatly disturbed the normaloperation of the electrical equipment and people’s lives.(1) The basic working principle and the best cutting time of the TSC is studied inthis paper, the working principle of the DSTATCOM is studied and its mathematical isestablished in this paper,several typical control strategies of the DSTATCOM isannlyzed.The current control of direct current control and the voltage control ofvoltage and current double closed-loop control method simulation is verified.In orderto improve the dynamic performance of DSTATCOM,a novel fuzzy adaptive controlbased on the passivity of the DSTATCOM is proposed in this paper, which furtherimproves the sele-adapting control performance of the device.(2) TSC has a large capacity of compensation, the low cost, the classificationcharacteristics of reactive power, DSTATCOM can suppress voltage fluctuation,automatic adjusting reactive power, and the speed of dynamic response characteristics.At present, it is via a single power electronic device to improve power quality in themost of power system. Combining with the characteristics of both, a TSC+DSTATCOM type hybrid reactive power compensator (HVC) is proposed in this paper,which can provide large capacity and continuous reactive power, and its costlower.The basic working principle and electrical model of the HVC are introducedfirst in this paper, and the harmonic amplification in the process of grouping if thediscrete system in the HVC is analyzed, the there-dimensional grid of the reactivepower compensation of the HVC, the power factor of system and three-dimensionalgrid voltage is discussed, and then the HVC control methods are introduced, and thecontrol for discrete and continuous system is coordinated; Finally the numericalsimulation has been carried on, that the HVC to increase power factor and improvethe quality of voltage and its correctness and effectiveness of the control method areshowed, and low cost, rapid, continuous reactive power compensati on of the lowvoltage distribution network are implemented, the purpose of the grid power factorand improve the voltage quality is achieved. (3) Finally, on the basis of the above basic theory research, a set of TSC+DSTATCOM type mixing device is developed in this paper, the device hardwarestructure diagram are given, the DC side capacitor, the design method of theparameters such as inverter, TSC are introduced in this paper. The software realizationdiagram of the overall system and related subroutine flow chart are given. Finally, theexperimental debugging has been carried on, the TSC+DSTATCOM type hybridreactive power compensation device can meet the requirement of reactive currentcontrol and voltage control are showed in the experiment results, the proposed hybridreactive power compensation device and its control method of the correctness,validity and feasibility are demonstrated in this paper. |
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