Frequency Regulation Mode of Renewable Energy Considering Power Coordination under the Condition of High Penetration

doi:10.12204/j.issn.1000-7229.2022.11.012

Abstract

Abstract:

As the proportion of renewable energy power generation continues to increase, the inertia of modern power system continues to decrease, and the frequency characteristics and power transmission appear unstable. This paper analyzes the influence of renewable energy access on the dynamic and steady-state characteristics of traditional power grid frequency and power, and clarifies that renewable energy needs to participate in system frequency regulation. Considering the coordination of the output of traditional synchronous generators and renewable energy, and the performance of the system frequency characteristics, three ways of renewable energy participating in the system frequency regulation are analyzed, and the influences on the frequency and power characteristics under load step are compared. A coordinated frequency regulation scheme for the output of traditional units and renewable energy is proposed. The hardware simulation experiment based on RTDS shows that the frequency regulation scheme proposed in this paper ensures the dynamic and steady-state characteristics of the frequency response of the system, and solves the problem of coordination between the synchronous generator and the renewable energy power.

Key words: renewable energy, traditional synchronous machine, frequency characteristics, power response, coordination, high penetration

CLC Number:

TM61

GAO Qixuan, LÜ Shixuan, ZHENG Lijun, ZHANG Wenjie. Frequency Regulation Mode of Renewable Energy Considering Power Coordination under the Condition of High Penetration[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(11): 122-131.

Figures/Tables 13

Fig.1 System structure under high penetration of new energy

Fig.2 Simplified small signal model of power system composed of synchronous generator

Fig.3 Simplified small signal model of power system with high penetration of new energy

Fig.4 Three types of renewable energy power generation participating in frequency regulation and inertia support

Fig.5 Unit step response waveform of G M i(s)

Fig.6 Unit step response waveform of G P i n _ i(s) and G P r e _ i(s)

Fig.7 Time-domain waveforms of ωr_pu、Pin_pu and Pre_pu under load power unit step

Fig.8 Power and frequency characteristic curves of renewable energy with different time constants for virtual turbines

Fig.9 Power and frequency characteristic curves of renewable energy with different values of virtual inertia

Fig.10 Simplified circuit model built on the simulation platform

Table 1 Inverter control parameters for simulating synchronous generators and using renewable energy as input

Fig.11 System frequency response waveform under different load steps

Fig.12 Waveforms of power variation of new energy and traditional unit output during load step in different ways

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