Intelligent comprehensive optimization device for power quality

A technology for power quality and optimization devices, applied in AC network voltage regulation, active power filtering, AC network to reduce harmonics/ripples, etc., can solve the problem of no longer harmonics and reactive power compensation, unfavorable high-quality output Waveform, DC capacitor voltage is easy to fluctuate, etc., to achieve the effect of improving compensation quality, reducing adverse effects, and improving pulse width

Inactive Publication Date: 2016-12-14
浙江百固电气科技股份有限公司
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  • Application Information

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Problems solved by technology

[0004] During the working process of UPQC, it is necessary to coordinate the DVR function and the APF function. When there is a voltage drop, the DVR function starts. At this time, there are two options for the APF function: 1. Synchronously stabilize the voltage of the DC capacitor C1*, which is used for voltage drop compensation, but there are disadvantages The reason is: UPQC no longer has harmonic and reactive power compensation. When the series side is performing voltage compensation, the harmonics and reactive power of the grid will have peak values, and harmonic processing and reactive power compensation must be performed in time; 2. Compensate harmonics, The DC capacitor C1* voltage is no longer maintained, but the disadvantage is that the DVR compensation function is limited, because the DVR function is completed only by the energy stored in the DC capacitor C1* and its auxiliary energy storage device. When the energy is used up, the DVR compensation function ends until the DC voltage Allow C1* to return to normal state before the next DVR compensation action can be performed
[0005] Through retrieval, the Chinese Patent Publication No. CN 104393599 A discloses a unified power quality adjustment device and method, which solves the above problems well. However, in this solution, the inventor found that in the above two APF function selections , the voltage of DC capacitor C1* is easy to fluctuate, which is not conducive to obtaining high-quality output waveforms, and because the harmonic and reactive power characteristics of user loads are regular, users cannot obtain excellent compensation speed for power quality compensation

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Embodiment Construction

[0029] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] Such as figure 2 Shown here is an intelligent comprehensive optimization device for power quality provided by an embodiment of the present invention. The device includes a DVR converter D1, a first APF converter F1, a second APF converter F2, a first DC capacitor C1, and The second DC capacitor C2, the transformer T1, the first reactor L1, the second reactor L2, the network controller M, the load compensator J and the DC voltage fluctuation suppressor K; among them,

[0031] The DVR converter D1, the first DC capacitor C1 and the first APF converter F1 are connected in parallel to form a first compensation circuit 11, and one end of the first compensation circuit 11 passes through the transformer from the DVR converter D1 side T1 is connected to the grid sid...

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Abstract

The invention provides an intelligent comprehensive optimization device for power quality. In the device, a DVR converter, a first direct current capacitor and an APF converter are connected in parallel to form a first compensation loop for voltage compensation; the DVR converter, a second direct current capacitor and a second APF converter are connected in parallel to form a second compensation loop for harmonic treatment and reactive compensation; load compensators are used for recording parameters of starting, running, cutting and the like of specific loads; a direct current voltage fluctuation suppressor is used for suppressing direct voltage of the first direct current capacitor and direct voltages of the second direct current capacitor; a network controller is used for achieving control over voltage compensation of the first compensation loop and control over harmonic treatment and reactive compensation of the second compensation loop and providing a corresponding compensation algorithm according to parameter variation rules in the load compensators. According to the intelligent comprehensive optimization device for the power quality, the compensation voltage drops when network voltage drops, harmonic treatment and reactive compensation are conducted when no drop exists, voltage fluctuation can be suppressed for obtaining high-quality output waveform, and the compensation speed of a user for conducting power quality compensation can be increased.

Description

Technical field [0001] The invention relates to the technical field of power systems, in particular to an intelligent comprehensive optimization device for power quality. Background technique [0002] UPQC (Unified Power Quality Conditioner) is usually composed of a series voltage source converter and a parallel voltage source converter through a common DC bus. It is installed near the harmonic load on the user side. At the same time, the voltage and current are compensated. The series voltage source converter functions as a DVR (Dynamic Voltage Restorer, dynamic voltage compensator), which can suppress voltage fluctuations, compensate for power supply voltage harmonics, and eliminate voltage swells or voltage sags that often occur in power distribution systems. Improve the damping of the device. The parallel voltage source converter functions as an APF (Active Power Filter), which can filter out load harmonic currents and compensate load reactive power. [0003] Such as figure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/16
CPCH02J3/01H02J3/16Y02E40/20Y02E40/30
Inventor 黄颖博
Owner 浙江百固电气科技股份有限公司
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