Method for improving dynamic performance of photovoltaic microgrid by using novel droop reactive compensation control
A technology for compensation control and dynamic performance, applied in reactive power compensation, AC network circuit, AC network voltage adjustment, etc. The effect of reducing the amount of voltage regulation and eliminating the steady-state voltage deviation
Inactive Publication Date: 2021-01-05
XIAN THERMAL POWER RES INST CO LTD
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[0003] The purpose of the present invention is to provide a method for improving the dynamic performance of a photovoltaic microgrid by using a new type of drooping reactive power compensation control to solve the problem of large range of voltage caused by excessive reactive power increase and decrease in the traditional drooping reactive power adjustment process
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[0029] The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings.
[0030] like figure 1 As shown, in the photovoltaic microgrid topology structure with two photovoltaic power points (simplified): the photovoltaic power point is a photovoltaic array; R n +jX n is the equivalent line impedance; the inverter device is connected to the large power grid and the load through the Point of Common Coupling (PCC).
[0031] like figure 2 As shown in the Thevenin equivalent circuit diagram of a photovoltaic microgrid containing two photovoltaic power points: U 1 ∠δ 1 , U 2 ∠δ 2 is the output voltage of photovoltaic power point 1 and photovoltaic power point 2 grid-connected inverter; P 1 ,P 2 , Q 1 , Q 2 Output active power and reactive power for photovoltaic power point 1 and photovoltaic power point 2 grid-connected inverters; U 0 ∠0 is the load impedance terminal voltage; Z load is the load equiva...
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The invention discloses a method for improving the dynamic performance of a photovoltaic microgrid by using novel droop reactive compensation control. The method comprises the following steps: establishing active and reactive equations output by an inverter at a single photovoltaic power supply point; simplifying active and reactive equations output by a single photovoltaic power supply point inverter; simulating droop external characteristics of the synchronous generator to establish a droop reactive compensation control equation according to active and reactive simplified equations output byan inverter at a single photovoltaic power supply point; and improving the droop reactive compensation coefficient, and automatically adjusting the droop coefficient according to the pressure difference to obtain a novel droop reactive compensation coefficient. The novel droop reactive power compensation coefficient is applied to a droop reactive power compensation control equation, and the purpose of improving the droop reactive power compensation control dynamic performance of the photovoltaic microgrid is achieved. The fixed droop coefficient is modified into the novel dynamic droop coefficient, the novel dynamic droop coefficient is automatically adjusted according to voltage deviation, the reactive compensation range is reduced, and the influence on the system is reduced.
Description
technical field [0001] The invention relates to a method for improving the dynamic performance of a photovoltaic microgrid by using a new type of drooping reactive power compensation control, which is used to reduce the reactive power compensation adjustment range of a photovoltaic microgrid grid-connected inverter, thereby reducing voltage deviation, and improving the dynamic performance and performance of a photovoltaic microgrid. Power supply reliability, a method to improve the utilization rate of each power point in the photovoltaic microgrid. Background technique [0002] In the AC micro-grid system composed of photovoltaics, the inverter device is connected to the large power grid through a common connection point, and droop control is usually used to maintain the power balance and voltage stability of the photovoltaic power point, and the voltage stability is achieved through reactive power compensation. In the actual system of photovoltaic micro-grid, excessive volt...
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IPC IPC(8): H02J3/50H02J3/16
CPCH02J3/16H02J3/50H02J2203/20H02J2300/22Y02E40/30
Inventor 李志鹏杨沛豪寇水潮薛磊贺婷赵俊博姜宁
Owner XIAN THERMAL POWER RES INST CO LTD