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Voltage feed-forward control method suitable for parallel connection of a plurality of stationary synchronous compensators

A static synchronous compensation, voltage feedforward technology, applied in reactive power adjustment/elimination/compensation, flexible AC transmission systems, AC networks to reduce harmonics/ripples, etc. Problems such as parallel operation of static synchronous compensators

Active Publication Date: 2015-12-02
山东万海电气有限公司
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Problems solved by technology

However, the power grid on the user side is not always in an ideal state. The existence of transformers makes the grid impedance on the user side exist. The existence of grid impedance makes a single static synchronous compensator that operates reliably, when multiple parallel connections occur, resonance occurs, or even fails to operate. Phenomenon
The existence of grid impedance greatly limits the parallel operation of large-scale static synchronous compensators

Method used

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  • Voltage feed-forward control method suitable for parallel connection of a plurality of stationary synchronous compensators
  • Voltage feed-forward control method suitable for parallel connection of a plurality of stationary synchronous compensators
  • Voltage feed-forward control method suitable for parallel connection of a plurality of stationary synchronous compensators

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Embodiment Construction

[0046] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0047] Such as figure 1 Shown is a flow chart of a voltage feedforward control method suitable for parallel connection of multiple static synchronous compensators of the present application;

[0048] Such as image 3 Shown is the control circuit diagram of the three-phase static synchronous compensator, where C dcand C DC side capacitor and filter capacitor, L 1 and L 2 is the filter inductance, Z g Measure the impedance of the network; U ga , U gb , U gc Respectively, the three-phase voltage of the system, U pcc / ab and U pcc / bc is the compensation point line voltage, θ is the phase of the extracted compensation point voltage, I dref and I qref Respectively, the reactive current reference value and the active current reference value.

[0049] Such as Figure 4 Shown is the topology diagram of multiple static synchronous compensat...

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Abstract

The invention relates to a voltage feed-forward control method suitable for parallel connection of a plurality of stationary synchronous compensators. The method includes the following steps of (1) determination of number of the stationary synchronous compensators: the number N of the stationary synchronous compensators in operation is determined by detecting the reactive component Iq of a system; (2) net-side impedance detection: the net-side impedance Zg is detected by means of an active injection harmonic method; and (3) feed-forward signal generation: the final feed-forward voltage Uff of the stationary synchronous compensators is obtained based on the net-side impedance Zg detected in the step (2), compensation point voltage Upcc, and current Ipcc. Compared with the prior art, the voltage feed-forward control method has the advantages of wide application, good robustness, and low loss.

Description

technical field [0001] The invention relates to a voltage feedforward control method, in particular to a voltage feedforward control method suitable for parallel connection of multiple static synchronous compensators. Background technique [0002] In recent years, with the rapid development of the economy and society, the user's power load has been continuously increased, followed by a large increase in the reactive load on the user side, which seriously pollutes the power quality of the power grid and makes the loss of the power grid continue to increase. , At the same time, it will also affect the normal and reliable operation of some electrical equipment. As an advanced reactive power compensation device, the static synchronous compensator has the advantages of small size, fast response, and continuous compensation. It can effectively compensate the reactive power on the user side, reduce the voltage drop of the transmission line, and have significant economic benefits. ...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/01
CPCY02E40/10Y02E40/40
Inventor 姚钢周荔丹金亮亮严昊
Owner 山东万海电气有限公司
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