Research and Application of Fast Accurate Voltage and Reactive Power Control Strategy for Photovoltaic Power Station

doi:10.11985/2023.01.026

Abstract

Abstract:

Due to the intermittence and fluctuation of photovoltaic power generation, the voltage stability of power grid will be affected after large-scale photovoltaic grid connection. In order to solve the problem that the traditional automatic voltage control has a long cycle and cannot respond to voltage fluctuation in time, an automatic voltage control method based on transient tracking of PV inverter terminal voltage is adopted. Through coordinated control of two-level control and one-level control, the coordinated control of steady-state voltage and transient voltage is realized. The second level control is the voltage and reactive power control of the photovoltaic power station, which optimizes the reactive power and voltage target in the station, and sends the target command to the first level controller. The first level controller realizes the voltage target tracking through the feedback control of the inverter output voltage. At the same time, the intelligent control terminal automatically maintains the output voltage to reach the steady-state voltage target value through fast reactive power target calculation and call, so as to realize the fast support of voltage transient disturbance.

Key words: Photovoltaic power station, inverter, voltage and reactive power, fast and accurate control, transient response

CLC Number:

TM761

XIE Zhidong, CHEN Lu, WANG Xiaotong, HU Hao, WANG Tongyi. Research and Application of Fast Accurate Voltage and Reactive Power Control Strategy for Photovoltaic Power Station[J]. Journal of Electrical Engineering, 2023, 18(1): 235-243.

Figures/Tables 17

References 16

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光照强度变化(%)	并网点电压波动范围/kV
光照强度变化(%)	恒功率因数控制	恒电压控制
100~50	0.738	0.345
100~0	1.875	0.741

序号	电压目标值/kV	始末时间	母线电压值/kV	全场无功	控制误差	是否合格
1	36.5	10:45:00	35.30	-3.55	0<ε≤0.5	合格
1	36.5	10:45:10	36.37	-0.58	0<ε≤0.5	合格
2	35.5	10:50:00	36.44	-1.17	0<ε≤0.5	合格
2	35.5	10:50:10	35.65	-3.27	0<ε≤0.5	合格
3	34.5	10:55:00	35.66	-3.20	0<ε≤0.5	合格
3	34.5	10:55:15	34.77	-5.12	0<ε≤0.5	合格
4	35.5	11:00:00	34.72	-5.24	0<ε≤0.5	合格
4	35.5	11:00:10	35.32	-4.03	0<ε≤0.5	合格
5	36.5	11:05:00	35.49	-3.89	0<ε≤0.5	合格
5	36.5	11:05:10	36.68	-1.31	0<ε≤0.5	合格
6	35.5	11:10:00	36.43	-1.60	0<ε≤0.5	合格
6	35.5	11:10:10	35.60	-2.30	0<ε≤0.5	合格

序号	电压目标值/kV	始末时间	母线电压值/kV	全场无功	控制精度	是否合格
1	35.0	14:38:55	35.91	-2.23	0<ε≤0.5	合格
1	35.0	14:39:05	35.10	-4.34	0<ε≤0.5	合格
2	36.0	14:43:55	35.14	-3.86	0<ε≤0.5	合格
2	36.0	14:44:05	35.93	-1.95	0<ε≤0.5	合格
3	37.0	14:48:52	35.97	-1.98	0<ε≤0.5	合格
3	37.0	14:49:00	37.05	0.77	0<ε≤0.5	合格
4	36.0	14:53:52	36.80	-0.28	0<ε≤0.5	合格
4	36.0	14:54:00	36.11	-2.02	0<ε≤0.5	合格
5	35.0	14:59:03	36.11	-1.69	0<ε≤0.5	合格
5	35.0	14:59:15	35.28	-3.74	0<ε≤0.5	合格