Transmission Capacity and Improvement Measures of the UHVAC Sending System from New Energy Base

doi:10.12204/j.issn.1000-7229.2022.07.015

Abstract

Abstract:

With the increasing proportion of new energy in power system, the safety and stability of large-scale new energy has become a common concern. Taking the 1 000 kV Zhangbei—Xiong’an UHVAC transmission line from the 10 million kilowatt new energy base in Zhangbei area as an example, this paper builds a PSASP electromechanical transient simulation model, which includes new energy model and distributed condenser model with low voltage crossing function. The paper analyzes the constraints of the new energy transmission capacity. And then the influence of different configuration schemes on short-circuit ratio of new energy and the suppression effect of transient overvoltage are studied. Finally, the optimization effect of transient overvoltage problem is verified by ADPSS all electromagnetic transient simulation. The results show that transient overvoltage and steady-state low voltage are the main factors restricting the transmission capacity of UHVAC line from new energy base. The distributed small-scale condenser is installed at the generator end with low short-circuit ratio of new energy, which can effectively restrain the transient overvoltage problem and improve the overall output capacity of new energy. The results of the study are of great reference value for planning, operation and design of the same kind of new energy delivery project in China.

Key words: 10 million kilowatts, UHVAC, transient overvoltage, distributed condenser

CLC Number:

TM72

XI Gongwei, ZHAO Bing, ZHENG Shuaifei, SHEN Lin, JIA Qi, YUAN Chao. Transmission Capacity and Improvement Measures of the UHVAC Sending System from New Energy Base[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(7): 131-138.

Figures/Tables 15

Fig.1 Simplified diagram of Zhangbei-Xiong’an UHVAC system

Fig.2 Gathering mode of Zhangbei new energy base

Fig.3 Requirements for low-voltage ride-through capability of wind farm

Fig.1 Requirements for low-voltage ride-through capability of photovoltaic power station

Table 1 Disconnection of wind power during Zhangbei-Xiong’an three-phase permanent N-1 fault

Fig.5 Wind harm AC sending system

Fig.6 LVRT active power response of wind power under different active power ratio coefficients

Fig.7 LVRT reactive power response of wind power under different reactive power ratio coefficients

Fig.8 Diagram of voltage vectors

Fig.9 Access mode of distributed condenser

Fig.10 Access mode of centralized condenser

Fig.11 Dynamic reactive power characteristics of condenser

Table 2 MRSCR before and after operation of distributed condenser

Fig.12 Zhangbei-Xiong’an UHVAC ADPSS model

Table 3 Optimization effect of the highest point of transient overvoltage at generator terminal in each region

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