A Virtual Inertial Control Method for Photovoltaic-Battery Power Generation System
A technology for power generation systems and photovoltaic cells, applied in photovoltaic power generation, photovoltaic power stations, photovoltaic modules, etc., can solve the problems of low inertia of the power grid, lack of theoretical research on inertial control methods, etc., and achieve the effect of timely inertial support
Active Publication Date: 2018-08-21
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
Photovoltaics and batteries are non-rotating static components, and the low inertia problem faced by the power grid under high penetration rates will be more severe than that of wind power. However, there is still a lack of theoretical research on the inertia control methods of photovoltaic-battery power generation systems.
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[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0036] Such as figure 1 As shown, a method for virtual inertia control of a photovoltaic-storage battery power generation system includes the following steps:
[0037] Step 1: Collect the frequency variation Δf of the photovoltaic-battery power generation system;
[0038] Step 2: Determine whether the frequency change Δf of the photovoltaic-battery power generation system is equal to 0. If so, the photovoltaic-battery power generation system is operating normally. At this time, the photovoltaic adopts the maximum power tracking MPPT mode to maximize the use of photovoltaic energy. The system is used to stabilize the fluctuation of photovoltaic output power, go to step 9, otherwise, go to step 3;
[0039] Step 3: Determine whether the frequency change Δf of the photovoltaic-storage battery power generation system is greater than zero...
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The invention discloses a virtual inertial control method for a photovoltaic-accumulator power generation system. When a power grid operates normally, an energy storage system can stabilize fluctuations of a photovoltaic output power, a photovoltaic grid-connected inverter keeps a voltage of a DC current stable, and thus grid-connected current control is achieved. When a fault occurs in a power grid, as the photovoltaic and energy storage elements are static elements and do not have rotating functions, after being connected into the power grid, the system is reduced in energy reserve, and thus the system faces a new problem about stability. According to the method of the invention, a change rate of a state of charge (SOC) and a speed of a charge-discharge current of the accumulator are adjusted by detecting variations of system frequency and the SOC of the accumulator, and thus the reserved energy of the accumulator is adjusted for a short term to provide an inertia support for the system.
Description
technical field [0001] The invention relates to a virtual inertia control method of a power generation system, in particular to a virtual inertia control method of a photovoltaic-storage storage battery power generation system, belonging to the field of photovoltaic power generation methods. Background technique [0002] The large-scale development and utilization of new energy has become a common choice for the world to achieve sustainable energy-economy-environmental development. Among them, as the cost of photovoltaic and energy storage methods decreases, the penetration rate of photovoltaic power generation in the power system continues to increase, which will bring new challenges to the safe and stable operation of the power system. Photovoltaics are connected to the power grid through power electronic converters. Compared with traditional synchronous generators, the power supply with inverter interface has a faster response speed but does not contain mechanical rotors,...
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IPC IPC(8): H02S10/20H02J3/24H02J3/38
CPCH02J3/385H02J3/24H02S10/20Y02E10/56Y02E70/30
Inventor 张祥宇杨黎付媛
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)