Photovoltaic inverter control method capable of improving power quality of distribution network
A technology of power quality and photovoltaic inverter, applied in photovoltaic power generation, energy storage, AC network load balancing, etc., can solve problems such as cost reduction and insufficient harmonic compensation ability of a single inverter, so as to ensure power quality, Significant social benefits and the effect of ensuring safe use
A technology of power quality and photovoltaic inverter, applied in photovoltaic power generation, energy storage, AC network load balancing, etc., can solve problems such as cost reduction and insufficient harmonic compensation ability of a single inverter, so as to ensure power quality, Significant social benefits and the effect of ensuring safe use
CN110460052APending Publication Date: 2019-11-15ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +3
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[0047] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:
[0048] A photovoltaic inverter control method that can improve the power quality of distribution network, such as figure 1 As shown, including the first control state and the second control state, the specific steps are as follows:
[0049] Step 1. The first control state of independent filter control: when the user side enables a nonlinear load, the load side sensor detects the voltage and current, and calculates THD in real time through the instantaneous reactive power method u and harmonic current, when the load side THD u When the value is higher than the limit and lasts for N power frequency cycles, the sensor sends the load-side THD to the inverter. u and harmonic current information, the inverter calculates the compensation current according to the remaining capacity, and filters out the harmonics under the condition that the inverter is n...
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The invention relates to a photovoltaic inverter control method capable of improving the power quality of a distribution network. The method comprises the steps that 1 the first control state of independent filter control: when a non-linear load is enabled on a user side, a load side sensor detects voltage and current, and calculates THDu and harmonic current in real time through an instantaneousreactive power method; when the load side THDu is higher than the limit and lasts for N power frequency cycles, compensation current is calculated based on the remaining capacity of photovoltaic grid-connected inverters, and harmonics are filtered out; and 2 the second control state of multi-inverter linkage filter control: when the load side sensor detects that THDu is below the limit and lasts for N power frequency cycles, the inverters stop the first control state; after an energy storage module is charged, the inverters can enter the second control state, and multiple inverters can coordinate to compensate power grid harmonics. According to the invention, the cost of improving the power quality can be reduced, and at the same time the user's profit is ensured.
Description
technical field [0001] The invention belongs to the technical field, and relates to an intelligent soft-switching voltage control method of an active distribution network, in particular to a photovoltaic inverter control method capable of improving the power quality of a distribution network. Background technique [0002] With the continuous development of photovoltaic power generation technology, the cost of photovoltaic power generation is gradually reduced. The continuous improvement of new energy grid-connected subsidy policies has further promoted the development of the entire industry. At present, distributed photovoltaic power generation has entered thousands of households. Users can install a solar power generation system on their roofs and earn income by selling electricity. However, with the use of a large number of power electronic equipment, a large number of harmonics will be injected, which not only reduces the power factor, but may also face fines when the ha...
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Patent Timeline
15 Nov 2019
Publication
CN110460052A
- IPC
- H02J3/01; H02J3/38; H02J3/32
- CPC
- H02J3/01; H02J3/32; Y02E70/30; Y02E10/56; Y02E40/40
- Inventors
- 姚宗强; 赵长伟