Coordinated Control Strategy of Wind-Solar-Storage Power StationSupporting Black Start of Power Grid

doi:10.12204/j.issn.1000-7229.2020.09.006

Abstract

Abstract:

Aiming at the black-start scheme of blackouts in areas with abundant wind and solar resources, this paper firstly establishes a black-start control model for wind-solar-storage power stations to study the process of supporting the black-start of the power grid. The energy storage system is used as the main power source to ensure the system voltage and frequency stable. Secondly, a coordinated control strategy for load tracking power of wind-solar units is proposed. When wind-solar power output is insufficient, wind-solar power unit adopts maximum power point tracking (MPPT) algorithm, and the energy storage system acts as the main power source to balance the power of microgrid. When wind-solar output is sufficient, wind-solar units effectively track load power changes to avoid excessive power charging to energy storage. This control strategy can not only reduce the times of charge-discharge conversion of the energy storage system, but also greatly reduce the configuration capacity of the energy storage system in black start, which can provide economic benefits. Finally, on the DIgSILENT/PowerFactory simulation platform, a control model for wind-solar-storage power station is built, and the simulation verifies the feasibility of wind-solar-storage power supply as power grid black-start source and the effectiveness of the control strategy proposed in this paper.

Key words: black start, wind-solar-storage power station, load tracking, frequency and voltage control

CLC Number:

TM61

CUI Hongfen, WANG Deshun, YANG Bo, WU Fubao, ZHU Tiantian, ZHAO Jingjing. Coordinated Control Strategy of Wind-Solar-Storage Power StationSupporting Black Start of Power Grid[J]. ELECTRIC POWER CONSTRUCTION, 2020, 41(9): 50-57.

Figures/Tables 13

Fig.1 Topology of wind-solar-storage power station supporting black start of power grid

Fig.2 Control diagram of the battery energy storage system

Fig.3 Control diagram of DFIG active-power control system

Fig.4 Photovoltaic P-U characteristic curve

Fig.5 Control of photovoltaic power

Fig.6 Control diagram of DFIG for load tracking and MPPT

Fig.7 Flow chart of load tracking and MPPT

Fig.8 wind speed variation

Fig.9 Time-varying irradiance

Table 1 Power configuration of the new energy power station

Fig.10 Relation between load and speed of asynchronous motor in power plant

Fig.11 Simulation diagram of DFIG working in MPPT control mode

Fig.12 Simulation diagram of DFIG working in MPPT control and load tracking mode

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