On Self-Organized Criticality of the East China AC–DC Power System—The Role of DC Transmission

Tu, Jie; Xin, Huanhai; Wang, Zhen; Gan, Deqiang; Huang, Zhihui

doi:10.1109/tpwrs.2013.2251913

Cited by 24 publications

(6 citation statements)

References 19 publications

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“…According to the equations (12) to (16), the sensitivity of each electrical variable to the guidance vector and its actual adjustment ability can be calculated, as shown in Appendix (Table A6). Because the power loss caused by DC line 。 14-4 blocking can be completely made up by 2 nonfault DC lines and the parallel AC line, the guidance vector contains only DC control variables.…”

Section: ) the First Stage Control: Security Correctionmentioning

confidence: 99%

“…In [15], a quantitative calculation method of AC/DC coordinated control in the receiving-end Central China power grid after the occurrence of Hazheng UHVDC bipolar blocking fault based on the real-time response data is proposed. In [16], a detailed AC/DC cascading failure analysis model is established to study the self-organized criticality of the East China. In the proposed model, some important issues of dc transmission and several kinds of stochastic factors are considered.…”

Section: Introductionmentioning

confidence: 99%

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Two-Stage Coordinated Control Strategy of AC/DC Hybrid Power System Based on Steady-State Security Region

et al. 2020

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The large-scale shift of power flow after DC blocking will seriously affect the secure operation of the system. Furthermore, after DC blocking, the system uses different control objectives in different operation stages. Therefore, a two-stage coordinated control of AC/DC hybrid power system based on steady-state security region (SSR) is proposed. Firstly, after DC blocking, the system needs to quickly restore secure operation with minimum cost. Therefore, the security correction guidance vector and the security distance sensitivity of the different control variables to it are obtained based on the linear fitting of the boundary surfaces of the SSR. The control cost of different control variables is characterized by the expansion and contraction of the SSR. According to the sensitivity of each control variable to the guidance vector and their actual adjustment ability, they are sorted and substituted into the security correction model to minimize the total adjustment cost during the process. Secondly, system will frequently be in a critical security state and not able to meet the needs of long-term secure and economic operation after security correction. Therefore, the security and economics of the system after security correction are comprehensively evaluated with the system generation cost, voltage deviation, and security margin under normal operating conditions and N-1 contingency conditions of heavy load lines. By calculating the security distance sensitivity of each control variable to the transmission limit of the crucial section, the sensitive generators and DCs that have significant effects on the transmission power of the crucial section are determined. Then the projections of security sub-region of high-sensibility control variables to optimization dispatch target, generation cost, voltage deviation, and the crucial section are depicted under different security margin, providing richer and more accurate operation information and strategic guidance for optimization dispatch. The calculation and analysis of the transformed IEEE 39-node system and the simplified actual power grid verify the correctness and effectiveness of the proposed coordinated control strategy.

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Section: ) the First Stage Control: Security Correctionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two-Stage Coordinated Control Strategy of AC/DC Hybrid Power System Based on Steady-State Security Region

et al. 2020

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“…This paper assesses system security under different reserve capacities by changing σ from 10% to 30%. Due to the fat-tail characteristics shown in Figure 8, the conditional value-at-risk (CVaR) is used to evaluate the risk level of a power system when suffering large-scale load loss just as shown in Equation (14), where α is the confidence probability [9]. α and VaR α satisfies that α = VaR α −∞ p(x)dx.…”

Section: Influence Of Spinning Reserve Capacitymentioning

confidence: 99%

“…Some static power-flow-based cascading failure models, for example, the ORNL-PSerc-Alaska (OPA) model [11], the Manchester model [12] and the improved OPA model [8], cannot simulate the frequency dynamics and deal with the power mismatch in simple ways. Recently, some full-time transient simulation-embedded models were proposed by [13][14][15]. They can simulate the detailed dynamics of the cascading process, but their computations are relatively slow, and some important supervisory control measures are not considered, for example, frequency-related generator tripping and emergency dispatch (ED) scheme.…”

mentioning

confidence: 99%

Risk Assessment of Power System Considering Frequency Dynamics and Cascading Process

2018

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Frequency security is vital to the safety of power systems and has been scrutinized for many years. The conventional frequency security analysis only checks whether the frequency after anticipated initial failures can remain in the normal range based on some aggregated models, but the influence of potential cascading failures has not been considered yet. This is not enough, especially when the modern power system suffers the increasing threat of cascading failures. Therefore, this paper proposes a novel frequency simulation model considering the influence of cascading failure to reveal the security level of power systems comprehensively. The proposed model is based on a platform on which the frequency dynamics and the power flow distributions can be calculated jointly. Moreover, simulation models of protection devices and some supervisory operation-control schemes are also taken into account. Case studies validate the effectiveness of the proposed model on the IEEE 39-bus system. Moreover, the results of some further probabilistic simulations under different operation parameters are obtained, which show the great significance of improving the frequency regulation performance to cope with challenges of blackouts.

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“…This is because inverters may experience commutation failures if the AC voltage is below certain threshold [2], [3]. Since most of the HVDC links deliver a very large amount of power, the commutation failure of one single link often induces a severe disturbance to the AC grid, further increasing the risk of cascading faults [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Impact of Commutation Failure Preventions on HVDC System Based on a Multi-Index Value Set Approach

et al. 2021

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This paper proposes a systematic method, based on rational approximation and value set approach, to unravel the impact of commutation failure preventions (CFPREVs) on HVDC system dynamics. First, some output variables in HVDC system dynamics are identified as performance indices, it is shown that these indices are rational functions of CFPREVs parameters. Then a numerical approximation method is used to determine the coefficients of the rational functions which describe the analytical relationship between the suggested performance indices and parameters. To help understand the connotation of the obtained expressions, a multi-index value set approach, which exploits the power of geometry and graphics, is described in detail. Finally, the results of the rational approximation and value set approach are reported.INDEX TERMS Commutation failure prevention, multi-index value set, multi-parameter analysis, rational approximation.

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On Self-Organized Criticality of the East China AC–DC Power System—The Role of DC Transmission

Cited by 24 publications

References 19 publications

Two-Stage Coordinated Control Strategy of AC/DC Hybrid Power System Based on Steady-State Security Region

Two-Stage Coordinated Control Strategy of AC/DC Hybrid Power System Based on Steady-State Security Region

Risk Assessment of Power System Considering Frequency Dynamics and Cascading Process

Impact of Commutation Failure Preventions on HVDC System Based on a Multi-Index Value Set Approach

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