(3) The impedance-frequency characteristic of HVDC converter and harmonic instabilityHarmonic instability has already led to several HVDC project shutdown in the pastdecades, while the impedance–frequency characteristic is important for analysis and solve thisproblem.
The influence of HVDC converter controls on the mode damping of sub-synchronous oscillations (SSO) in a AC/DC power system is investigated in this paper by using eigenvalue analytical method.
The paper presents a method to determine equivalent DC impedance and equivalent AC impedance of HVDC converter viewed respectively from DC side and AC side based on switching function theory.
The detailed modeling of controls and power system elements is required in the transient performance study of HVDC(High Voltage DC transmission) converter using EMTP/ATP.
(2) Small signal stability analysis of HVDC based on quasi-steady modelOn the basis of HVDC quasi-steady model, different state equation of small signalmodels of common-used control system are elaborated.
(5) Optimized grounding resistance configuration against dc bias of transformerThe amplification of harmonic and bus voltage distortion in commutation bus bytransformer dc bias will deteriorate the operation condition and easily lead to harmonicinstability.
It does not need any communication channel to the control of the main HVDC converter stations.
The conventional method of calculating high-voltage direct current (HVDC) converter commutation angles can result in very inaccurate results if the ripple of the DC is fairly high, or the HVDC link consists of capacitor commutated converters (CCC).
Although reactive power does no useful work, it is inherently required for operating any alternating-current power system or HVDC converter.
Figure 2.1 shows the classical construction of a HVDC converter plant.
Functionally, the VFT is similar to a back-to-back HVDC converter.
The harmonic model of HVDC converter suitable for the computation of har- monic power flow with multi-harmonic sources is worked out.Given the 3-phase A.C.voltages and their harmonic voltages,the harmonic currents poured in to h e A.C.system from the converter are calculated.The program is made and the ontrast calculations between the harmonic currents with and without the 5th har- monic voltage on the converter bus are carried out.
This paper introduces the use of an RTDS for the verification of HVDC control and protection.For high accuracy firing and high frequency simulation requirements,a new approach for an Advanced Hybrid HVDC Real- Time Sim ulator using classical physical m odels for the converter section in combination with a complex fully digital AC and DC power system simulator im plem ented on RTDS is developed.The realization and performance verification of its technology are described. This hybrid sim ulator has been chosen...
This paper introduces the use of an RTDS for the verification of HVDC control and protection.For high accuracy firing and high frequency simulation requirements,a new approach for an Advanced Hybrid HVDC Real- Time Sim ulator using classical physical m odels for the converter section in combination with a complex fully digital AC and DC power system simulator im plem ented on RTDS is developed.The realization and performance verification of its technology are described. This hybrid sim ulator has been chosen for Chinese Tian- Guang HVDC project tests.Based on the testing of HVDC control and protection,new m odels for this hybrid simulator set- up are implemented and verified by tests.Compared with EMTDC com puter simulations,the control and protection performance is verified and the results are also given.
The influence of HVDC converter controls on the mode damping of sub-synchronous oscillations (SSO) in a AC/DC power system is investigated in this paper by using eigenvalue analytical method. Taking the advantage of the numerical calculation and data visualization functions in MATLAB, the curved surface of SSO mode damping to parametric plane of the rectifier control is calculated and drawn in three-dimensional space. Furthermore, an approach is proposed to visualize the parametric stability region of SSO. For...
The influence of HVDC converter controls on the mode damping of sub-synchronous oscillations (SSO) in a AC/DC power system is investigated in this paper by using eigenvalue analytical method. Taking the advantage of the numerical calculation and data visualization functions in MATLAB, the curved surface of SSO mode damping to parametric plane of the rectifier control is calculated and drawn in three-dimensional space. Furthermore, an approach is proposed to visualize the parametric stability region of SSO. For every SSO mode, an optimal damping ridgeline is discovered and damping variation with gain and time constant of the rectifier control is not absolutely monotonous. Decrease of time constant and increa.se of gain can make SSO modes depart from the parametric instability region to the parametric stability region or far from the former. The trend is beneficial to robust stability, however, not always beneficial to mode damping.
hvdc换流器
hvdc converter
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