Coordination control method of three-phase two-level type photovoltaic system participation power grid frequency adjusting
A photovoltaic system, grid frequency technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the problems of not considering the applicability of control methods, not considering the participation of DC capacitor power in frequency regulation, etc., to improve the frequency stability of the grid. Effect
Inactive Publication Date: 2018-04-27
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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The above patents do not consider using the electric energy stored in the DC capacitor to participate in frequency regulati
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[0040] The three-phase two-stage photovoltaic system participates in the simulation verification of power grid frequency regulation.
[0041] Scenario: Under time-varying temperature and light, a load surge occurs.
[0042] The photovoltaic system operates in 10% load shedding mode. At 620s, load 2 is connected to the grid system. image 3 for the light and temperature curves. A comparison of dynamic frequency changes in the power grid where only synchronous generators participate in the frequency response of the grid and the photovoltaic system adopts a coordinated control method and synchronous generators participate in the frequency response of the grid at the same time Figure 4 As shown, when only the synchronous generator set participates in the frequency response, the system frequency fluctuates with the fluctuation of light and temperature, because the frequency fluctuation cannot be suppressed well only by the synchronous generator set. When the photovoltaic system...
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The invention discloses a coordination control method of three-phase two-level type photovoltaic system participation power grid frequency adjusting. The method is formed by direct current capacitanceand voltage control and active power-frequency droop control based on load decreasing control. In the direct current capacitance and voltage control, according to a power grid frequency deviation, adirect voltage reference value is adjusted via a proportional controller and an amplitude limiting link, and charging/discharging power of a direct current capacitor of a DC/AC inverter side is changed. In the load decreasing control, through increasing a photovoltaic array outlet voltage, a photovoltaic system acquires certain standby power. In the active power-frequency droop control, through proportion control of a variable coefficient, a droop coefficient and the photovoltaic system standby power form a direct ratio, and according to the power grid frequency deviation and the droop coefficient, an active power increase/decrease amount participating in frequency adjusting is calculated so that a photovoltaic system possesses power up-regulation and down-regulation capabilities when a power grid frequency is changed. In the invention, a frequency modulation capability of a three-phase two-level type photovoltaic system can be fully performed in time-varying illumination and temperature environments.
Description
technical field [0001] The invention relates to the technical field of power grid frequency regulation control, in particular to a control method for using the photovoltaic system's own ability to participate in power grid frequency regulation. Background technique [0002] With the continuous maturity of power electronics technology, as a low-cost clean energy, the large-scale utilization of photovoltaic power generation has become a development trend. Although the active power and reactive power output of the photovoltaic power generation system can be flexibly adjusted through the control of the power electronic converter, while improving the utilization efficiency of light energy and realizing maximum power tracking, it also completely resolves the active power output of the photovoltaic system and the grid frequency. Coupled, and the photovoltaic system itself does not have rotating equipment and cannot provide any inertial response. Therefore, the connection of large-c...
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Login to View More IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/383Y02E10/56
Inventor 吕雪许昭杨洪明张宁
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY