Power Flow Calculation Model of PQ Coupling Photovoltaic and Influence of Photovoltaic on Distribution Network Voltage

doi:10.11985/2016.10.001

Abstract

Abstract:

Photovoltaic power incorporated into distribution network provides the active power. At the same time reactive power output is very important in regulating voltage. According to the structure of grid-connected photovoltaic power, the power flow calculation model of PQ-coupled photovoltaic power is established. The active and reac-tive power output of photovoltaic power is modulated by phase shift angle and modulation ratio of the inverter. According to the actual output need of photovoltaic power, setting the modulation ratio and phase shift angle, inverters can work at a reasonable state and the output of photovoltaic power can also meet the system power requirements. The active and reactive power output of grid-connected photovoltaic power affect the voltage of the distribution network. Numerical examples show that the PV type photovoltaic power approves the local node voltage significantly, PQ coupling and with a maximum capacity of voltage regulator type photovoltaic power approves the overall system voltage significantly.

Key words: Grid-connected photovoltaic power, PQ-coupled, effects of voltage, power flow calculation model

CLC Number:

TM614

Fang Zhang,Hui Li,Li Zhang. Power Flow Calculation Model of PQ Coupling Photovoltaic and Influence of Photovoltaic on Distribution Network Voltage[J]. Journal of Electrical Engineering, 2016, 11(10): 1-6.

Figures/Tables 8

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Tab.1

Tab.2

Tab.3

Fig.5

References 11

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方案	接入节点9的光伏电源类型
0	无光伏电源
1	PV型（P = 300kW,V = 12.66kV）
2	PI型（P = 300kW,I = 10A）
3	PQ型（P = 300kW,Q = 0）
4	PQ耦合且具有最大出力（P = 300kW,Q = 0）
5	PQ耦合且具有最大电压调节能力

调制比	移相角/(°)	功率因数
0.800	12.632	0.962
0.811	9.474	0.979
0.821	3.158	1.000
0.832	7.895	1.000
0.842	11.053	1.000
0.853	14.211	1.000
0.863	15.790	1.000
0.874	17.368	1.000
0.884	18.947	1.000
0.895	20.526	1.000
0.905	22.105	1.000
0.916	23.684	1.000
0.926	25.263	1.000
0.937	26.842	1.000
0.947	26.842	1.000
0.958	28.421	1.000
0.968	30.000	1.000
0.979	30.000	1.000
0.990	30.000	1.000
1.000	30.000	0.999

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