Distributed photovoltaic grid-connected stable network voltage control method and system terminal
A distributed photovoltaic and grid voltage technology, applied in photovoltaic power generation, AC network circuits, electrical components, etc., can solve problems such as restricting reactive power and voltage control, slow dynamic response of feedback algorithms, and exceeding apparent power limits.
Active Publication Date: 2019-02-12
NORTHEASTERN UNIV
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Problems solved by technology
Existing reactive voltage control methods would require the end-of-line inverter to absorb too much inductive reactive power, even exceeding its apparent power limit
Moreover, the grid structure parameters are complex, and the dynamic response of some feedback algorithms is slow
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[0048] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings.
[0049] Such as figure 1 As shown, in this embodiment, a stable grid voltage control method for distributed photovoltaic grid-connected is provided, which includes the following steps:
[0050] Real-time collection of power quality parameters of Taiwan Substation photovoltaic grid-connected points and operating parameters of each grid-connected equipment;
[0051] Perform reactive power and voltage control, adjust the reactive output of the photovoltaic inverter, and use the remaining power capacity to provide reactive power support for the grid when the active output of the photovoltaic inverter does not reach the rated capacity;
[0052] Perform energy storage voltage control, charge and discharge through photovoltaic energy storage to adjust photovoltaic gri...
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The invention belongs to the technical field of network voltage control, and particularly relates to a distributed photovoltaic grid-connected stable network voltage control method and a system terminal. The distributed photovoltaic grid-connected stable network voltage control method comprises the following steps: acquiring power quality parameters of a photovoltaic grid-connected point and operation parameters of each set of grid-connected equipment in real time; performing reactive voltage control to adjust a reactive output of a photovoltaic inverter; when an active output of the photovoltaic inverter fails to reach the rated capacity, providing a reactive support for a power grid with the residual power capacity; performing energy storage voltage control, and performing charging and discharging through photovoltaic energy storage to adjust the photovoltaic grid-connected power; and controlling the stored energy to send reactive power for reactive voltage control. The distributed photovoltaic grid-connected stable network voltage control method takes full consideration of the active / reactive adjustable margin of the photovoltaic inverter, makes effective use of photovoltaic stored energy to realize coordinative control, and can further achieve the aims of improving the operation efficiency of the inverter and realizing peak shaving of a power grid load and implement an optimal output and stable network voltage control of a photovoltaic power station.
Description
technical field [0001] The invention belongs to the technical field of power grid voltage control, and in particular relates to a method for controlling the voltage of a distributed photovoltaic grid and a stable power grid voltage and a system terminal. Background technique [0002] One of the typical characteristics of the traditional distribution network is centralized power supply. The upper-level power transmission system provides a single-point power supply to the surrounding power distribution system. Without considering the transformer tap, due to the existence of line impedance, the closer The higher the voltage at the first end of the line, the lower the voltage near the end of the line. In order to ensure the power demand at the end of the line, the first end of the line is generally 10% higher than the rated value. However, after the distributed power supply is connected to the distribution network, the pattern of traditional single power supply radial power supp...
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Login to View More IPC IPC(8): H02J3/46H02J3/38H02J3/32
CPCH02J3/32H02J3/383H02J3/46Y02E10/56Y02E70/30
Inventor 王大志武益珂
Owner NORTHEASTERN UNIV